83results about How to "Reduce induced voltage" patented technology

A projected shape of permanent magnets is contained within a plane of projection formed by adjacent claw-shaped magnetic poles overlapping when the claw-shaped magnetic poles are viewed in a direction of rotation of a rotor, and is generally similar in shape to a shape of the plane of projection.

Electrical machine (1) having a stator (3), which has axially extending cooling channels (8) in the laminate stack and / or cooling channels (9) extending between the stator and a housing, having a rotor (20), whose laminate stack (19) has an inner hole or is positioned on a spider structure (7) having an inner hole, wherein permanent magnets (14) are arranged in or on the laminate stack (19) of the rotor (20), wherein at least one axial-flow fan (4) is provided in the inner hole of the rotor (20), the air flow produced by said axial-flow fan, once it has passed through the rotor (20), by means of flowing through a suitable apparatus (13) achieves a nozzle effect which, owing to the venturi effect, brings about an air flow through the cooling channels (8) arranged in the stator (3). The remanence of the permanent magnets (14) is therefore positively influenced.

This invention relates to a low temperature plasma device for blocking discharge by a differential feeder medium including a difference output high voltage supply, two high voltage electrodes, in which, the output of the differential output high voltage supply is connected with the two high voltage electrodes, a layer of medium is covered on one of the electrodes or set at any place between the two electrodes, and the gas between them is the load and the voltages to the earth of the two output ends of the supply connected to the two electrodes are equal or almost equal, the phase difference is 180 deg. or approaching to 180deg, which can generate DBD of large discharge clearance for producing large volume of gas discharge low temperature plasma and reduce the supply output voltage necessary for gas discharge.

A microminiature power converter includes a thin film magnetic induction device including a ferrite substrate and a solenoid coil conductor extending along the first and second principal planes of the substrate with the conductor extending through through-holes formed in the substrate to form a coil configuration. Electrodes are positioned near the peripheral region of the substrate and are collectively arranged at least one along the direction parallel to the axis of the solenoid coil formed by the conductor. The length of the coil can be increased to increase the inductance value of the coil. Gaps or grooves are provided near or in the peripheral region of the ferrite substrate to reduce induced voltage appearing in the electrodes.

The invention discloses a supporting and protecting device for a high-speed wind tunnel plasma flow control experiment. The supporting and protecting device for the high-speed wind tunnel plasma flow control experiment comprises an aerofoil-profile insulation protecting and supporting device and an electromagnetic shielding and protecting device; the aerofoil-profile insulation protecting and supporting device comprises a side wall pivoted window structure and an attack angle mechanism supporting platform; the electromagnetic shielding and protecting device comprises multiple layers of shield high-voltage leads and a grounding copper foil wide band. The supporting and protecting device provided by the invention can be used for guaranteeing the insulation among a model, a side wall pivoted window and a supporting platform and the insulation between fixing screws and ear sheets, meanwhile also guaranteeing the intensity of the side wall rotary window and the supporting platform, additionally enabling induction electromagnetic fields to be attenuated layer by layer by adopting multiple layers of shielding high-voltage leads, meeting the safety of voltage and electromagnetic shielding requirements of measurement and control instruments, and reducing the induced voltage caused by the transmission lead radiation electromagnetic fields greatly by adopting copper foil broad band ground connection.

A motor includes a stator having a winding, and a rotor. The rotor rotates by receiving a rotational magnetic field generated by drive current supplied to the winding. The winding includes a first winding and a second winding, the first and second windings both being excited at the same timing by the drive current. The first winding and the second winding are connected in series. The rotor includes a first pole section and a second pole section. The second pole section faces the second winding at the rotation position of the rotor at which the first pole section faces the first winding. The magnetic force exerted on the stator by the second pole section is weaker than that exerted by the first pole section.

The present invention discloses a hollow cathode heater and a hollow cathode structure, the heater comprises an inner ceramic skeleton (4), a heating wire (5) and an outer ceramic sleeve (6); outer side of the inner ceramic skeleton (4) and / or inner side of the outer ceramic sleeve (6) has a first a structure; the first structure is any one or any combination of a protrusion, a groove or a smoothsurface; the outer ceramic sleeve (6) is nested outside the inner ceramic skeleton (4), a first space is surrounded and formed between the outer side of the inner ceramic skeleton (4) and the inner side of the outer ceramic sleeve (6) through the first structure. The hollow cathode heater is easy to process and assemble, has high mechanical strength and high reliability, and has a serpentine heating wire, with induced magnetic fields at adjacent positions cancelling each other, can effectively reduce an induced voltage and an induced current generated by the induced magnetic fields at the ignition moment, reduce thermal shock of the heating wire and improve reliability and life span of a space electric propulsion system.

The embodiment of the invention provides an array substrate and a manufacturing method thereof, which relate to the field of manufacturing of display elements and are used for reducing induced voltage of pixel electrodes to reduce screen flicker. The array substrate comprises a transparent substrate; grid lines and data lines crossed horizontally and longitudinally are arranged on the transparent substrate, and thin film transistors and the pixel electrodes are arranged in pixel units defined by the grid lines and the data lines; and grid electrodes of the thin film transistors are connected with the grid lines, source electrodes of the thin film transistors are connected with the data lines, and leakage electrodes of the thin film transistors are connected with the pixel electrodes. The array substrate is characterized in that the grid electrodes of the thin film transistors in an area just opposite to the leakage electrodes are thicker than that of the grid electrodes in an area just opposite to channels of the thin film transistors. The array substrate and the manufacturing method thereof are used in the field of manufacturing of the display elements.

A method of controlling an isolated switching power converter that includes a transformer with a primary side and a secondary side, at least one primary switch coupled to the primary side of the transformer and at least one synchronous rectifier coupled to the secondary side of the transformer is disclosed. The method includes turning on the synchronous rectifier a first fixed time after turning on the primary switch and turning off the synchronous rectifier a second fixed time after turning off the primary switch. Power converters for operation according to this method are also disclosed, including power converters without an output inductor.

[Problem ] To provide a technique that reduces a drop of induced voltage in a non-contact tag. [Solution ] An expendable container of the present invention comprises a memory circuit. The memory circuit has a memory, an antenna being capable of establishing non-contact communication with an external receiver transmitter, and a controller controlling the non-contact communication and an access to the memory. The memory circuit has a plurality of modes including ID information confirmation mode and low power consumption mode. The memory circuit is capable of shifting to the low power consumption mode in response to a completion of confirmation of the ID information of the expendable container.

The invention provides a production method of an insulation intermediate connector. The insulation intermediate connector is produced by respectively adopting processes of semiconductive stress cone and stress pipe glue injection molding, insulation connector integral glue injection, external semiconductive layer compounding and secondary vulcanization and expansion, wherein in the semiconductive stress cone and stress pipe glue injection molding process, the mass ratio of a semiconductive liquid silicon rubber component A to a semiconductive liquid silicon rubber component B is 1: (0.8-1.2); and in the insulation connector integral glue injection process, the mass ratio of an insulation liquid silicon rubber component A to an insulation liquid silicon rubber component B is 1: (0.8-1.2). All components in semiconductive liquid silicon rubber and all components in insulation liquid silicon rubber are respectively subjected to glue injection by adopting given mass ratios so as to obtain the insulation intermediate connector. When the insulation intermediate connector is applied to a high-voltage cable, induction voltage on a cable metal sheath can be effectively reduced, and induction voltage of a single-core cable line to auxiliary cables and communication cables can be reduced, wherein the auxiliary cables and the communication cables are adjacent to the single-core cable line.

The invention discloses a cable laying method and a bracket thereof. More than one group of three-phase cables is arranged along the circumference direction of a concentric circle, so that the same group of three cables is arranged on the same circumference, and included angles between every two cables are 120 DEG. The bracket has the advantages of simple structure, low cost, minimum longitudinal induced voltage, and better energy saving effect because longitudinal induced voltages in the whole circulating section are mutually cancelled out as smallest as possible, even zero.

Disclosed is a single-body transformer having a novel wiring structure. Voltage-regulating coils in each phase are identical in structures and include crude-regulating coils and fine-regulating coils, the crude-regulating coils in each phase include n-level crude-regulating coils which are connected in series or parallel, two adjacent levels of the n-level crude-regulating coils are serially connected with the other levels of crude-regulating coils which are connected in series after being connected with a series-parallel switch, wherein the n is an optional integer within 2 to 10. Idling coils are utilized sufficiently to increase current guide sections of the coils, so that equivalent reduced resistance and resistance loss of windings of a transformer body are reduced and efficiency of the transformer is improved. Meanwhile, inductive voltage of the tails of the crude-regulating coils can be reduced and insulation level thereof is reduced as well, and safety coefficient is increased. The crude-regulating coils which are connected in series and parallel are equal in the number of turns and are uniformly vertically disposed in a staggered manner in the transformer body, reactance and resistance drop of the two coils are completely identical, and current circulation caused by uneven voltage drop of the two coils connected in parallel is avoided.

An electric motor drive device has an inverter adjusting the voltage applied to an AC electric motor so as to drive the AC electric motor, a capacitor which is charged by a current supplied from a DC power supply supplying DC voltage between a neutral point at which a plurality of coils of the AC electric motor are connected and a positive rail or negative rail of an inverter and passing through the inverter, and a control circuit controlling the inverter so that the AC electric motor turns at a designated speed. Further, the control circuit selectively uses field weakening control and voltage boosting control for control of the inverter according to the conditions of the induced voltage generated at the AC electric motor, DC power supply, and voltage of the capacitor.

The invention relates to a stator of a motor and a manufacturing method of the stator. The stator of the motor comprises a plurality of main pole pairs and a plurality of exciting windings. Each main pole pair comprises a pole body, an armature inlet side pole shoe and an armature outlet side pole shoe. All the exciting windings are embedded in stator grooves between the armature inlet side pole shoes and the pole bodies and between the armature outlet side pole shoes and the pole bodies. The stator is characterized in that grooves and / or through holes are formed in at least one armature outlet side pole shoe, so that the overall or local width and / or the overall or local thickness of at least one armature outlet side pole shoe are / is reduced.

The invention discloses a power device soft switching-off circuit comprising a load electronic component Load, an input voltage and a lead inductor arranged in the same series circuit of a power device. The power device is connected to power device withstand voltage, driving voltage and the gate capacitor of the power device. A driving circuit is disposed on a circuit where the power device is connected with the driving voltage in series. The power device soft switching-off circuit processes a switching-off process in segments. The switching-off speed is increased at the phase t1-t2 and the phase t2-t3, and is slowed down at the phase t3-t4. The switching-off speed is increased at the phase t2-t3 in order to reduce the loss of the switching-off phase, and is slowed down at the phase t3-t4in order to reduce the induced voltage caused by switching-off. The total switching-off time and total switching-off loss are balanced in order to reduce the voltage applied to the power device and reduces the losses and heat generation of the power device.

A control device for a driving apparatus. The control device is configured with a device that controls the rotary electric machine via the inverter, a device that determines whether a disconnect condition of the main power supply is satisfied, and a device that obtains an estimated field amount that is an estimated value of the field flux supplied from the rotor to the stator. The control device is also configured with a device calculates an induced voltage that is induced in the coil, and a device that determines whether an overvoltage state in which the induced voltage exceeds a voltage resistance of the inverter exists. If it is determined that an overvoltage state exists when the disconnect condition is satisfied, connection with a main power supply is maintained until the overvoltage state is eliminated. The rotary electric machine is controlled by weakening the field flux to the coil.

The invention provides an optical fiber composite overhead ground wire with a fast ice melting function.While fast ice melting is ensured, a product does not need to be repeatedly wired in the ice melting process, and meanwhile compared with ice melting of a traditional ground wire, induction voltages are reduced, and the problems that during overhead ground wire ice melting, operation is complex, and induction voltages are high are solved.The optical fiber composite overhead ground wire comprises an inner core structure and an outer-layer conductor.The inner core structure is arranged in a cavity formed by the outer-layer conductor and comprises a light unit and a metal stranded wire.The light unit and the metal stranded wire are stranded to form an outer layer of the inner core structure.A non-inductive twisted pair is arranged in a cavity formed by stranding the light unit and the metal stranded wire, external ports are formed in the non-inductive twisted pair by being spaced by a certain distance, the two external ports are connected, and alternating currents are introduced.A circuit loop can be formed by the position, between the two external ports, of the non-inductive twisted pair and is powered on to generate heat, and the heat is transferred to the surface of the wire to smelt coating ice.

A vacuum turbomolecular pump (10) is driven by a brushless direct current drive motor (16), which has stator coils and a permanent magnetic-exited motor rotor. When rotating, the motor rotor produces an electromotive force oriented counter to the direction of rotation. A motor controller (22) is provided, which is connected to the stator coils and which generates a current from the supply voltage, this current being impressed into the stator coils. In addition, a rotary frequency regulator (32) is provided that limits the rotary frequency (f) of the drive motor (16) to a nominal rotary frequency (fN). A power supply (20) is provided, which is connected to the motor controller (22) and which supplies a constant direct current voltage as a supply voltage for the motor controller (22).; The power supply (20) is designed so that the constant supply voltage (UV) is low enough that at a limit rotary frequency (fG), the electromotive force is equal to the drive force that can be maximally generated by the motor controller (22) and by the stator coils. The limit rotary frequency (fG) is less than 1.3 times the nominal rotary frequency (fN). As a result, the motor output is limited and the rotary frequency of the drive motor (16) is physically restricted to a limit rotary frequency (fG) in a reliable manner.

The invention relates to a method for inhibiting an induction voltage and an induction current of a 750kV parallel single-line construction line. Two large-distance parallel and single-line construction 750kV alternating current transmission lines are coupled on an off-the-line line to generate a higher induction voltage and a higher induction current to ensure that the problem of difficult equipment selection caused by exceeding the turning on or off capacity of the existing 750kV earthing switch is solved. The invention provides a transposition and phase sequence arrangement mode to ensure that levels of the induction voltage and the induction current applying the measure are remarkably reduced and are lower than the requirement on technical parameters of the existing equipment, and thus the equipment selection problem is solved.

The invention discloses a pole-mounted circuit breaker with a built-in isolation switch, and belongs to the technical field of power generation, power transformation or power distribution. A circuit breaker switch, an isolating switch and a transmission mechanism of the isolating switch are arranged in the same sealed box body, the circuit breaker switch comprises an arc extinguishing chamber, anarc extinguishing chamber static end copper guide rod and a contact spring assembly, the isolating switch comprises a moving contact and a static contact, the transmission mechanism comprises a synchronizing shaft, an output crank arm, an insulating pull rod and a rotating assembly, and the whole main loop is loaded in an insulating box. The problems that a common pole-mounted circuit breaker is small in opening distance and cannot serve as a reliable fracture, and an isolation switch and a pole-mounted load switch cannot remove short-circuit faults are solved, rapid mechanical linkage of thecircuit breaker and an isolation knife is achieved, and the condition of achieving the rapid reclosing function is achieved.

This invention discloses one three-way stable adjusting device compensating coil inducing voltage and touch point arch removing method, which comprises compensating transducer series initial coil, control circuit and its coil head touch point, which is characterized by the following: setting voltage reducing touch points between multiple series compensating coils to divide multiple series coil into front and back sections; The coil two ends are connected to one arc removing coil controlled by arc coil to Reduce the inducing coil voltage below 660 v; Connecting touch point coil in each initial compensation coils two ends to keep current unchanged through coil by reverse electricity energy to make the adjusting device operate reliable.

A steering control device includes a feedback processing portion configured to control a current flowing through a motor to a current command value; an end determination processing portion configured to determine whether a turning angle of steered wheels has reached a limit angle; and an end-time limit processing portion configured to limit a magnitude of the current command value to a magnitude of a limited current value or smaller, when the end determination processing portion determines that the turning angle has reached the limit angle. The limited current value is a value obtained by performing correction to decrease a magnitude of a detected value of the current flowing through the motor at a time when the end determination processing portion determines that the turning angle has reached the limit angle, based on a degree of a decrease in a magnitude of a rotational speed of the motor.

The present invention relates to an MSM (Metal-Semiconductor-Metal) X-ray detector and an electronic device. The MSM X-ray detector comprises a plurality of pixel units, each pixel unit comprises onesecond layer including source and drain patterns and a third layer including one second common electrode pattern; coupling capacitances between the second common electrode patterns and the source anddrain patterns are smaller than or equal to a set threshold value to reduce the thermal noise of each pixel unit in the MSM X-ray detector. The coupling capacitances between the second common electrode patterns and the source and drain patterns are regulated to allow the coupling capacitances to be smaller than or equal to the set threshold value so as to reduce the thermal noise on a connection data line where the drain is located. Besides, the voltage of the power source connected with first common electrodes and / or the second common electrodes is regulated to a negative voltage to reduce the leakage current of the coupling capacitors related to the first common electrodes or the second common electrodes and reduce the noise generated by the pixel switch tube TFT so as to facilitate improvement of the detection efficiency.

A microminiature power converter includes a thin film magnetic induction device including a ferrite substrate and a solenoid coil conductor extending along the first and second principal planes of the substrate with the conductor extending through through-holes formed in the substrate to form a coil configuration. Electrodes are positioned near the peripheral region of the substrate and are collectively arranged at least one along the direction parallel to the axis of the solenoid coil formed by the conductor. The length of the coil can be increased to increase the inductance value of the coil. Gaps or grooves are provided near or in the peripheral region of the ferrite substrate to reduce induced voltage appearing in the electrodes.

The invention relates to a method for reducing the insulation overhead ground wire induction voltage of an alternating current transmission line. The method comprises the following steps that the insulation overhead ground wire induction voltage limit value U<0> and the circuit current I are determined; when an insulation overhead ground wire grounding point is selected to be at one end part, the insulation overhead ground wire transposition pitch 1<0> is calculated to be (8-15)*U<0> / I<km>, and a nearby tension rod tower is selected every ten points from the end part of an insulation overhead ground wire as transposition nodes for carrying out ground wire transposition or conducting wire transposition; and when the insulation overhead ground wire grounding point is positioned between two ends of the insulation overhead ground wire, the insulation overhead ground wire transposition pitch 2*1<0> is calculated to be (16-30)*U<0> / I(km), the nearby tension rod tower is selected every 2*1<0> from one end part of the insulation overhead ground wire as transposition nodes for carrying out ground wire transposition or conducting wire transposition, and in addition, the insulation overhead ground wire grounding point is arranged nearby the half transposition pitch of one transposition node. The method has the advantage that the induction voltage can be reduced to be within the set induction voltage limit value U<0>.

When switching a current (Ic) by means of a semiconductor circuit breaker (44), provision can be made for a control voltage to be generated at the control input (50) of the semiconductor circuit breaker (44) by an actuation circuit (42) at switching flanks of a switching signal, said control voltage having a profile which is flattened in relation to the profile of the switching signal. One disadvantage of a solution of this kind is that the switching losses in the power semiconductor (44) are very high for the period during which the control voltage is reduced only slowly with a flattened profile. The object of the present invention is to reduce the switching losses in a semiconductor circuit breaker (44). In the case of the circuit arrangement according to the invention, a value can be predefined for a switching parameter of a control device (56) of the actuation circuit (42), it being possible for a switching behaviour of the actuation circuit (42) to be influenced by said switching parameter. In this case, a specific parameter value of the switching parameter can be varied during operation of the actuation circuit (42).

The invention relates to an inductive disturbance reduction device (18) for reducing an inductive disturbance of a signal like an ultrasound signal to be transmitted via first connection conductors (25, 26) of an electrical connector (11), which is caused when ablation current flows through a second connection conductor (24) of the electrical connector. The inductive disturbance reduction device is adapted to induce a voltage, which at least partly compensates a voltage induced in the electrical connector, in order to reduce the inductive disturbance in the signals to be transmitted via the first connection conductors of the electrical connector. Since the inductive disturbance is reduced, a high quality electrical connection can be provided, without necessarily using, for instance, a technically relatively complex and expensive coaxial connector. The inductive disturbance reduction device may be integrated, for instance, in a part of the electrical connector or in a cable.

The invention relates to a double-delta double-circuit transmission line with phase sequence in the same tower window, which belongs to the technical field of high, ultra-high and extra-high voltage overhead line electric power transmission. The A-phase wire, the B-phase wire and the C-phase wire of a first circuit transmission line are arranged at the upper side of a supporting frame in a delta shape, and the A-phase wire, the B-phase wire and the C-phase wire of a second circuit transmission line are arranged at the lower side of the supporting frame in a delta shape. All the phase wires are relatively fixed with the supporting frame through a wire supporting rod. The transverse two-phase wires on the second layer are positioned in the same phase position, and the first layer wires and the third layer wires at both sides of the supporting frame are respectively positioned in the same phase position. The transmission line has higher natural power and narrower power transmission corridor; compared with the double-circuit transmission line with same phase sequence in the same tower window, the transmission line has lower lightning protecting wire induced voltage and lower double-circuit simultaneous tripping rate during the lightning striking process; and compared with the double-circuit transmission line with negative phase sequence in the same tower window, the transmission line has smaller potential supplied current and recovery voltage, and lower radio interference, audible noise and corona loss.