36results about How to "Reduce the influence of magnetic field" patented technology

The invention provides an experimental device for forming a hydrate in a combined multi-phase fluid pipeline, and belongs to the field of hydrate flowing safety. The device is characterized in that a liquid phase is arranged in a reaction kettle, and a gas is injected into the reaction kettle by boosting of a gas booster pump; a window on the cylinder body of the reaction kettle can be used for observing the forming condition of hydrate in the reaction kettle; a cooling liquid with which a jacket outside the reaction kettle is filled is used for controlling temperature of the reaction kettle, and temperature and circulation of the cooling liquid is controlled by a temperature-control water bath; and temperature and pressure signals in the hydrate forming process are collected by a data collection system. Two methods are provided for using the device, according to the first using method, the reaction kettle is used as a shaking kettle, the reaction kettle on a shaking rack is driven by a motor in a power shaking system, the center of the kettle body is used as a fulcrum, and two ends of the reaction kettle swing up and down, so that gaseous and liquid phases in the reaction kettle are driven to be mutually mixed; and according to the second using method, the reaction kettle is used as a stirring kettle, a magneton in the reaction kettle is driven to rotate by an external magnetic field which is provided by a magnetic stirrer in a magnetic stirring system, and gaseous and liquid phases in the reaction kettle are stirred.

The invention discloses a parallel IGBT power unit. The parallel IGBT power unit comprises an upper bridge IGBT module and a lower bridge IGBT module. Each IGBT module includes at least two IGBT modules which are connected in parallel, and further comprises an upper busbar and a lower busbar which are correspondingly connected with the two IGBT modules. The upper busbar is provided with a first leading-out terminal for connecting with a first main busbar and a first capacitor connecting terminal for connecting with a capacitor. The lower busbar is provided with a second leading-out terminal for connecting with a second main busbar and a second capacitor connecting terminal for connecting with a capacitor. According to the parallel IGBT power unit, the two IGBT modules and the two busbars which have identical structures and are correspondingly connected with the modules respectively are adopted; the leading-out terminals for connecting with the main busbars and the capacitor connecting terminals for connecting with the capacitors on the busbars are in conductive connection with docking connecting terminals and capacitor connecting terminals at corresponding positions of the IGBT modules of corresponding busbars by using copper bars in identical lengths; and since busbars connecting the IGBTs are identical in length, the current-sharing performance of the parallel IGBT modules on the busbars is guaranteed, and a problem of uneven current during parallel connection of the IGBTs is solved.

The invention discloses a polymer solution-based magnetofluid self-assembly needle-free electro-spinning device which comprises a groove. The device further comprises a controllable magnetic field generation module, a high-voltage electric field generation device, a conductive fiber receiving device used for collecting cellosilk, and at least one conductive and magnetic conductive cone tower. The surface of the cone tower is provided with a threaded groove ascending spirally along the cone tower. The polymer solution-based magnetofluid self-assembly needle-free electro-spinning device is simple in structure, operation is controllable and easy to control, and processing efficiency is high. Meanwhile, the invention further provides a nanofiber electro-spinning method achieved through the needle-free electro-spinning device. According to the method, the aim of controlling jetting of polymer solution-based magnetofluid is achieved by controlling electric and magnetic fields. The method is controllable, easy to control and good in control accuracy.

According to an embodiment, an electronic device may include: a foldable housing including: a hinge; a first housing connected to the hinge and including a first face facing a first direction and a second face facing a second direction opposite the first direction; and a second housing connected to the hinge and including a third face facing a third direction and a fourth face facing a fourth direction opposite the third direction, the second housing configured to be folded relative to the first housing about the hinge, wherein, in a folded state, the first face faces the third face, and, in an unfolded state, the third direction is the same as the first direction; a display including a first portion and a second portion extending from the first face to the third face to form the first face and the third face, respectively; a digitizer including a third portion disposed between the first portion of the display and the second face and a fourth portion disposed between the second portion of the display and the fourth face; a first magnet disposed in the first housing to overlap the third portion of the digitizer when viewed from above the second face; a second magnet disposed in the second housing to overlap the fourth portion of the digitizer when viewed from above the fourth face and to face the first magnet in the folded state; a first magnetic shield fixed to the hinge and at least partially disposed in the first housing, the first magnetic shield configured to be movable relative to the first magnet wherein, when viewed from above the second face, the first magnetic shield member does not overlap the first magnet in the folded state and overlaps the first magnet in the unfolded state; and a second magnetic shield fixed to the hinge and at least partially disposed in the second housing, the second magnetic shield configured to be movable relative to the second magnet wherein, when viewed from above the second face, the second magnetic shield member does not overlap the second magnet in the folded state and overlaps the second magnet in the unfolded state.

The invention relates to a driving integrated magnetic adsorption wheel type device. The driving integrated magnetic adsorption wheel type device is characterized by comprising a transmission shaft, a harmonic reducer, a wheel body rubber coating shell, a motor, a transmission support, a belt wheel shaft, a magnet and a wheel body end cover, wherein the wheel body rubber coating shell and the wheel body end cover are matched to form a closed space, the transmission shaft is installed on the center axis of the wheel body rubber coating shell, one end of the transmission shaft extends out of the wheel body rubber coating shell and the wheel body end cover and is connected with a car body, and the other end of the transmission shaft is connected with a rigid wheel through a flange plate; the motor and the magnet are arranged at the position, located at the two sides of the harmonic reducer, in the space of the wheel body rubber coating shell, one side of the magnet is fixed to a first copper sleeve through a second magnetic support, and the other side of the magnet is fixed to the transmission shaft through a first magnetic support; one end of the motor is fixed to the transmission shaft through the transmission support, the belt wheel shaft is fixed to the portion, between the transmission shaft and the motor, of the transmission support, an output shaft of the motor, the belt wheel shaft and the transmission shaft are parallel and transmit power in the mode of a synchronous belt.

The invention relates to the technical field of magnetic stirring machines and discloses a bottom-heated magnetic stirrer, comprising a base, a cup having a receiving cavity for holding material to be stirred, a magnetic stirring member disposed in the center of the cup, and an electromagnetic driving mechanism driving the magnetic stirring member to rotate in the receiving cavity of the cup; the electromagnetic driving mechanism is positioned outside the middle of the cup; the cup is disposed on the base; the base is provided with a bearing portion in contact with the bottom of the cup, and the bearing portion is provided with a heating device for heating the cup. The heating mechanism is provided to heat a liquid in the cup; the magnetic stirring member and the electromagnetic driving mechanism for driving the magnetic stirring member to rotate are provided to stir the liquid in the cup, and the liquid in the cup can be stirred and heated as well. In addition, as both the electromagnetic stirring mechanism and the magnetic stirring member are positioned in the middle of the cup, the mechanisms are far away from the heating device and can operate normally.

The invention provides electronic equipment. The electronic equipment comprises an antenna and a metal structure which are accommodated in a shell; in a first direction, the metal structure, at least part of the antenna and part of the shell are arranged in sequence; the metal structure is provided with a non-closed slot, and the slot penetrates through the metal structure in the first direction; the metal structure comprises a first surface directly facing the antenna in the first direction, the vertical projection of the antenna on the first surface is an antenna projection area, and the slot extends from the edge of the first surface to the interior of the first surface and passes through the antenna projection area, thus, when the antenna is in a working state, induced current in the same direction as current on the antenna is formed on the first surface. By using the electronic equipment provided by the invention, due to the existence of the non-closed slot on the metal structure, the adverse effect of the induced current on the magnetic field of the antenna is reduced, and the working performance of the antenna is effectively improved.

The invention provides a current sensor that may reduce the influence of a magnetic field generated by a current flowing in a neighboring current path which is provided in the vicinity of a current path to be measured, and accurately measure a current value of the current path to be measured. A current sensor includes the current path to be measured (11), a neighboring current path (21) that is provided in the vicinity of the current path (11) to be measured, first and second magnetoelectric transducers (12a, 12b) having a main sensitivity axis parallel to a direction of a magnetic field generated by a current to be measured flowing in the current path (11) to be measured, and are provided so that the directions of the magnetic fields generated by the current to be measured are applied in mutually opposite directions, and third and fourth magnetoelectric transducers (13a, 13b) having a main sensitivity axis being non-orthogonal to a direction of a magnetic field generated by the neighboring current while being orthogonal to the direction of the magnetic field generated by the current to be measured, and are provided so that the directions of the magnetic fields generated by the current to be measured are applied in mutually opposite directions.

A magnetic sensor (32) detects an external magnetic field (m) to invade from the outside of an X-ray image tube (11) into an electron lens area (23), and a coil (33) arranged in an input face area (21) of the X-ray image tube (11) generates a magnetic field to cancel the external magnetic field (m) so that the influence of the external magnetic field (m) is eliminated to correct the distortion. The magnetic sensor (32) is arranged in the area, which is surrounded by a magnetic shield (20) of the X-ray image tube (11), and in the outer circumference area on the side of the electronic lens area (23) spaced from the input face area (21) of the X-ray image tube (11). The magnetic sensor (32) is less influenced by the magnetic field, which is generated by the coil (33) arranged on the side of the input face area (21) of the X-ray image tube (11), so that it detects the external magnetic field (m) to invade into the electron lens area (23), highly precisely. As a result, a distortion correcting device (31) of the X-ray image tube (11) can correct the distortion automatically.

The invention provides a disturbing magnetic field compensation method. The disturbing magnetic field compensation method is specifically applied to a tracking and compensation sensor at the positionof a non-working region of a magnetic field coil and can eliminate the difference, caused by distance prolonging, between coil constants of a primary compensation winding. According to the method, onthe basis of a conventional disturbing magnetic field compensation system, a secondary compensation winding is added to the position of the tracking and compensation sensor, so that the magnetic fieldcoil constant, at the position of the tracking and compensation sensor, of the primary compensation winding in the disturbing magnetic field compensation system is equal to the magnetic field coil constant at the position of a detected sensor. The method can eliminate the difference, caused by inconsistency between the position of the compensation sensor and the position of the detected object, between the magnetic field coil constants of the primary compensation winding, so that the disturbing magnetic field compensation system achieves the optimal compensation effect.

The invention provides a nano precipitate image acquisition method based on a scanning electron microscope back scattering mode. The nano precipitate image acquisition method comprises the following steps of sample pretreatment, electrolytic double-spray thinning, low-temperature erosion and scanning electron microscope shooting, so as to obtain a nano precipitate morphology image. According to the nano precipitate image acquisition method, the thickness of the sample is reduced, the purposes of improving the conductivity of the sample and reducing the magnetic influence are achieved, so thatthe imaging quality of the nano precipitate image in the steel material under the scanning electron microscope is improved; and compared with a traditional sample preparation and shooting method, a clearer image with a higher multiple can be obtained by adopting the nano precipitate image acquisition method, and the nano precipitate image acquisition method has certain significance in precipitatemorphology observation and size and distribution statistics.

The invention discloses a motor and a household electrical appliance. The motor comprises a rotor assembly and a magnetic induction part, wherein the rotor assembly comprises a rotor iron core and a rotating shaft connected with the rotor iron core, the rotor iron core is provided with a rotor end ring along the axial end part of the rotating shaft, and a groove is formed in the surface of the rotor end ring; a magnet is arranged in the groove, and the magnetic induction part has an induction surface for detecting the change of a magnetic field, so that the axial space of the motor can be saved, and the output power and the loading capacity of the motor can be improved; and the induction surface of the magnetic induction part faces the magnet and is perpendicular to the axial direction of the rotating shaft, so that the induction surface detects the magnetic field of the magnet in the axial direction, the influence of the magnetic field of the motor on the magnetic field of the magnet is reduced, the interference of the magnetic field of the motor is effectively reduced, the induction surface can accurately detect the magnetic field change of the magnet, and the motor can adjust the rotating speed more accurately.

The invention provides a device used for X-ray CT equipment to observe growth characteristics of natural gas hydrate in a blind pipe and belongs to the field of flow assurance in the delivery process of oil and gas. In-situ generation of the natural gas hydrate in the blind pipe of an oil-gas pipeline can be simulated, and growth conditions of the natural gas hydrate can be observed through the X-ray CT equipment. After liquid is injected into a reaction kettle and after leakage detection, gas is injected into the reaction kettle through a constant-pressure pump, and consumption of the gas is recorded to evaluate the growth conditions of the hydrate. During detection, a magnetic stirring system is used for stirring liquid in the reaction kettle, simulating flow of a liquid phase in the pipeline and promoting mutual cooperation of gas-liquid phases to generate hydrate. Every other certain period, X-ray CT photographing is conducted in the reaction kettle, the growth condition of hydrate in the blind pipe is observed, and growth characteristics of the hydrate in the blind pipe are studied. Measuring results are used for on-site guidance of a seabed oil-gas delivery system, and a powerful theoretical support can be provided for deep studying of hydrate risk control technology.

The invention relates to a working table of a computer numerical control machine tool. The working table comprises a working table body and a cleaning mechanism. The cleaning mechanism comprises a cleaning baffle and a cleaning assembly. The cleaning assembly comprises an electromagnetic assembly, a linear reciprocating drive mechanism and a recovery groove with an opening formed in the top. The electromagnetic assembly comprises an electromagnet, a power supply, a control switch and a controller, wherein the electromagnet, the power supply and the control switch are sequentially connected in series and form a circuit. The controller controls on-off of the electromagnet through the control switch, and the electromagnet can do reciprocating motion between a scrap discharging opening and the position over the opening of the recovery groove by controlling displacement of the electromagnet through the linear reciprocating drive mechanism. Therefore, the moving space of metal powder scraps generated when a tool machining mechanism on the working table of the computer numerical control machine tool machines workpieces is limited, the metal powder scraps are stably centralized at one position of the working table and are prevented from flying around, cleanliness of the working table is guaranteed, and the work burdens and cleaning difficulty of cleaning personnel are reduced.

The invention relates to the technical field of baby series bamboo and wood products and discloses an adjustable automatic bamboo cradle based on a connecting rod transmission principle. The cradle comprises a base, and the top of the base is fixedly connected with a supporting rod. A lifting gear is movably connected to the interior of the supporting rod; the interior of the lifting gear is fixedly connected with a rotating rod; the outer portion of the lifting gear is in engaged connection with a fixing frame. A pawl is movably connected to the outer part of the fixed frame; the outer part of the pawl is movably connected with a limiting block; a limiting spring is fixedly connected to the outer part of the limiting block; a motor is fixedly connected to the interior of the fixed frame;through cooperative use of the supporting rod, the lifting gear, the rotating rod, the fixing frame, the pawl, the limiting block and the limiting spring, the effect of controlling the height of the cradle is achieved, the requirements of parents with different heights for the cradle with different heights are met, the applicability of the cradle is improved, and the using effect of the cradle isimproved.

The invention provides a magnetic protection device for a electron microscope laboratory. The magnetic protection device is suitable for the situation that the imaging effect is poor due to the fact that the installation environment of an electron microscope is often interfered by an external magnetic field. According to the magnetic protection device, a constant magnetic field space can be created and maintained in the working space of the electron microscope, so that power lines and magnetic lines in the space are uniformly distributed. By passively shielding an external magnetic field and actively adjusting an internal magnetic field, the influence of electromagnetic interference on the electron microscope is avoided or reduced, and the electromagnetic compatibility of an electron microscope experiment space is improved. The magnetic protection device comprises: a magnetic shielding material (1); a magnetic shielding frame (2); a magnetic field detector (3); a wire (4); a controller(5); ground wire (6).

The invention provides an electric energy meter, a circuit board wiring structure and a wiring method, and relates to the technical field of circuit board design. The electric energy meter is used for metering electric energy consumed by load equipment, and comprises an interface, a sampling circuit, a transmission line and a chip package which are arranged on a circuit board. The interface is used for connecting the load equipment and comprises a positive interface and a negative interface; the positive interface and the negative interface are sequentially connected with the sampling circuit and the chip package through the transmission line; the chip package is used for metering electric energy; and the transmission lines are arranged on the circuit board in a crossed mode at least once. According to the scheme provided by the invention, the influence of a changing magnetic field on the electric energy meter is reduced, and the accuracy of the electric energy meter during electric energy metering is improved.

The invention provides a nano-precipitate image acquisition method based on scanning electron microscope backscattering mode. The method includes the following steps: sample pretreatment, electrolytic double-spray thinning, low-temperature erosion, and scanning electron microscope shooting to obtain the nano-precipitate morphology image. The invention achieves the purpose of improving the electrical conductivity of the sample and reducing the influence of magnetism by reducing the thickness of the sample, thereby improving the imaging quality of the nano-precipitate image in the steel material under the scanning electron microscope. Compared with the traditional sample preparation and shooting methods, it can obtain more Higher magnification and clearer images have certain significance for the observation of precipitate morphology and the statistics of size and distribution.

A cathode ray tube comprising a panel of which an outer surface is substantially flat; a shadow mask installed with a certain interval from an inner surface of the panel, having a plurality of apertures through which electron beams pass, and formed as a pin-cushion shape in which long and short sides of the shadow mask are inwardly concaved; and the mask frame for fixing and supporting the shadow mask, wherein long and short sides of the mask frame are slanted from ends toward centers thereof in order to maintain a predetermined interval with the long and short sides of the shadow mask. According to this, a strength of the shadow mask is increased and an influence of a magnetic field is reduced thus to obtain an optimum quality.

A cathode ray tube comprising: a panel whose outer surface is substantially planar; a shadow mask mounted at a distance from the inner surface of the panel, having a plurality of holes for electron beams to pass through, and forming a pincushion shape in which the long and short sides of the shadow mask are recessed toward the inside; and a shadow mask frame for fixing and supporting the shadow mask in which the long and short sides of the shadow mask frame start from the end Inclined toward the center, this is to maintain a predetermined interval from the long and short sides of the shadow mask. Thereby, the strength of the shadow mask is increased, and the influence of the magnetic field is reduced, thus obtaining excellent performance.

The invention discloses an electric drive axle structure with double motors and a working method of the electric drive axle structure, and belongs to the technical field of automobile transmission systems. The structure comprises a first motor, a second motor, an epicyclic gear train, a driving gear, a driven gear, a differential mechanism, a driving half shaft and a brake. The first motor stator, the first motor rotor, the second motor stator and the second motor rotor are all arranged on the shaft; the epicyclic gear train comprises a gear ring, a planet carrier, a sun gear and a planet gear; the first motor rotor is fixedly connected with the sun gear, the second motor rotor is fixedly connected with the gear ring, and the gear ring is connected with the brake; one side of the planet carrier is connected with the planet wheel, the other side of the planet carrier is connected with the driving gear, the driving gear is meshed with the driven gear, and the driven gear is connected with the differential mechanism which is connected with the driving half shaft. The invention is compact in structure, high in flexibility, easy to install and maintain and capable of being suitable for different operation working conditions, and the cruising ability of the vehicle is effectively improved.

The invention provides an experimental device for forming a hydrate in a combined multi-phase fluid pipeline, and belongs to the field of hydrate flowing safety. The device is characterized in that a liquid phase is arranged in a reaction kettle, and a gas is injected into the reaction kettle by boosting of a gas booster pump; a window on the cylinder body of the reaction kettle can be used for observing the forming condition of hydrate in the reaction kettle; a cooling liquid with which a jacket outside the reaction kettle is filled is used for controlling temperature of the reaction kettle, and temperature and circulation of the cooling liquid is controlled by a temperature-control water bath; and temperature and pressure signals in the hydrate forming process are collected by a data collection system. Two methods are provided for using the device, according to the first using method, the reaction kettle is used as a shaking kettle, the reaction kettle on a shaking rack is driven by a motor in a power shaking system, the center of the kettle body is used as a fulcrum, and two ends of the reaction kettle swing up and down, so that gaseous and liquid phases in the reaction kettle are driven to be mutually mixed; and according to the second using method, the reaction kettle is used as a stirring kettle, a magneton in the reaction kettle is driven to rotate by an external magnetic field which is provided by a magnetic stirrer in a magnetic stirring system, and gaseous and liquid phases in the reaction kettle are stirred.

The invention provides a disturbance magnetic field compensation method, specifically a disturbance magnetic field compensation method when the tracking compensation sensor is in the non-working area of ​​the magnetic field coil, which can eliminate the difference in the coil constant of the primary compensation winding caused by the increase of the distance. The method is based on the conventional interference magnetic field compensation system, adding a secondary compensation winding at the position of the sensor for tracking compensation, so that the magnetic field coil constant of the primary compensation winding at the position of the sensor for tracking compensation in the interference magnetic field compensation system is the same as that of the sensor under test. The magnetic field coil constants at the positions are equal, and this method can eliminate the difference in the magnetic field coil constants of the primary compensation winding caused by the inconsistency between the compensation sensor and the measured object, so that the interference magnetic field compensation system can achieve the best compensation effect.

The invention relates to a ripple suppression inductor and a direct-current power supply circuit. The inductor comprises a conducting circuit, a magnetic part and a compensation coil, the head end andthe tail end of the magnetic part are connected to form an annular structure with an opening in an enclosing mode, the conducting circuit penetrates through the opening, the compensation coil is arranged around the magnetic part, the conducting circuit is used for transmitting direct currents, and the compensation coil is used for connecting compensation currents. According to the ripple suppression inductor and the direct-current power supply circuit, a magnetic field generated after the compensation current passes through the compensation coil is counteracted with a magnetic field generatedby the current in the conducting circuit in the magnetic part; the influence of direct current in the conducting circuit on the magnetic field of the magnetic part is reduced; in this way, the current passing through the magnetic part is only ripple current, due to the fact that the ripple current amplitude is small and is the alternating current with the polarity changing positively and negatively, the magnetic conductivity of the magnetic part can be prevented from being reduced due to magnetic bias, the ripple suppression inductor has the large inductance value, the ripple current suppression effect of the ripple suppression inductor is improved, and the use reliability is improved.

A camera module is provided, comprising: a mover mounted with a lens; a stator supporting the mover to an optical direction of the lens; a side actuator mounted with a coil and a magnet moving the mover to the optical direction relative to the stator; a ball interposed between the mover and the stator; and coils, each coil provided at the mover and the stator to guide a linear travel of the ball, wherein the side actuator is lopsidedly arranged at each one side of the stator and the mover.

The invention discloses a built-in precise centering device of a gyroscope. The built-in precise centering device comprises a shell, a through hole, a suspension body, a buffer pad, a jewel bearing, an electromagnet, a magnet and a magnetic shielding cover; The through hole is formed in the center of the shell, the suspension body is installed in the through hole, and the buffer pad is arranged between the through hole and the suspension body. The jewel bearing is mounted in the suspension body; the magnet is arranged in the suspension body and is mounted on the lower surface of a bulge on the outer side of the top end of the suspension body; the electromagnet is arranged in the shell, the electromagnet is arranged in the shell below the external expansion groove at the top end of the through hole, the electromagnet is opposite to the magnet on the suspension body, and the magnet is matched with the electromagnet. The built-in precise centering device has the characteristics that rigid contact and abrasion are avoided, the centering control circuit detects and adjusts magnetic suspension centering, and magnetic field interference on the gyroscope is reduced.

A magnetic shoe structure of a direct-current micromotor comprises a magnetic shoe body, wherein an inner cambered surface and an outer cambered surface of the magnetic shoe body are concentric; and two R corners are respectively arranged at two ends of the outer cambered surface. The magnetic shoe structure of the direct-current micromotor is characterized in that two flat sections are oppositely arranged on the outer cambered surface inwards along the inner ends of the two R corners, and are symmetrical to each other; and a gap is formed between each flat section and an lengthened surface of an arc-shaped surface in the middle of the outer cambered surface. The vertical distance L between the outer end of each flat section and the arc-shaped lengthened surface of the outer cambered surface is 7%-8% of a distance L1 between the outer cambered surface and the inner cambered surface. The arc length l1 of the arc-shaped surface in the middle of the outer cambered surface is 75%-78% of the whole arc length of the outer cambered surface. By the magnetic shoe structure, the increasing degree of current of the micromotor is reduced under the condition that the load speed of the micromotor is greatly increased, and moreover, noise can be reduced.

The invention discloses a polymer solution-based magnetofluid self-assembly needle-free electro-spinning device which comprises a groove. The device further comprises a controllable magnetic field generation module, a high-voltage electric field generation device, a conductive fiber receiving device used for collecting cellosilk, and at least one conductive and magnetic conductive cone tower. The surface of the cone tower is provided with a threaded groove ascending spirally along the cone tower. The polymer solution-based magnetofluid self-assembly needle-free electro-spinning device is simple in structure, operation is controllable and easy to control, and processing efficiency is high. Meanwhile, the invention further provides a nanofiber electro-spinning method achieved through the needle-free electro-spinning device. According to the method, the aim of controlling jetting of polymer solution-based magnetofluid is achieved by controlling electric and magnetic fields. The method is controllable, easy to control and good in control accuracy.

The invention discloses a parallel IGBT power unit. The parallel IGBT power unit comprises an upper bridge IGBT module and a lower bridge IGBT module. Each IGBT module includes at least two IGBT modules which are connected in parallel, and further comprises an upper busbar and a lower busbar which are correspondingly connected with the two IGBT modules. The upper busbar is provided with a first leading-out terminal for connecting with a first main busbar and a first capacitor connecting terminal for connecting with a capacitor. The lower busbar is provided with a second leading-out terminal for connecting with a second main busbar and a second capacitor connecting terminal for connecting with a capacitor. According to the parallel IGBT power unit, the two IGBT modules and the two busbars which have identical structures and are correspondingly connected with the modules respectively are adopted; the leading-out terminals for connecting with the main busbars and the capacitor connecting terminals for connecting with the capacitors on the busbars are in conductive connection with docking connecting terminals and capacitor connecting terminals at corresponding positions of the IGBT modules of corresponding busbars by using copper bars in identical lengths; and since busbars connecting the IGBTs are identical in length, the current-sharing performance of the parallel IGBT modules on the busbars is guaranteed, and a problem of uneven current during parallel connection of the IGBTs is solved.