42results about How to "Suppresses speed fluctuations" patented technology

The invention discloses a method for inhibiting speed fluctuation of a permanent magnet synchronous motor. The method includes the steps of: obtaining a target rotating speed omega_ref, a feedback rotating speed, and a fluctuation rotating speed delta(omega), a q axis inductor Lq and a permanent magnet flux linkage (phi)f of the permanent magnet synchronous motor; performing PI adjustment on delta(omega) to obtain a q axis reference current Iq_ref, and obtaining a q axis target voltage Ud* according to Iq_ref, omega_ref, delta(omega) and (phi)f; performing PI control on a q axis actual voltage according to Ud* so as to obtain a q axis compensating current Iq_add; obtaiing a d axis target voltage Ud* according to Iq_ref, Iq_add, omega_ref, delta(omega) and Lq, and performing PI control on a d axis actual voltage according to Ud* to obtain a d axis compensating current Id_add; superposing Iq_add and Iq_ref to perform feedforward compensation on a q axis current, and superposing Id_add and a d axis reference current to perform feedforward compensation on a d axis current. The inhibition method can realize effective inhibition of speed fluctuation in operation of the permanent magnet synchronous motor by performing feedforward compensation on the d axis current and the q axis current. The invention also discloses a control device of the permanent magnet synchronous motor and a compressor control system.

An image forming apparatus includes a photosensitive member rotatably supported by a bearing portion provided on a supporting casing; a motor fixed on the supporting casing; a driving gear provided on the supporting casing; and a driven gear for being engaged with the driving gear to be rotated integrally with the photosensitive member. The driven gear includes teeth each of which is crowned such that a tooth thickness is maximum at a maximum tooth thickness position with respect to the gear thickness direction. A maximum force receiving position of the tooth where a force received by the driven gear from said driving gear is maximum when the photosensitive member is driven is different from the maximum tooth thickness position. The tooth thickness decreases from the maximum tooth thickness position toward the maximum force receiving position at a first degree and decreases from the maximum tooth thickness position away from the maximum force receiving position at a second degree, by the crowning. The first degree is larger than the second degree.

A bundle claw attached to a sheet conveyor belt includes a concave portion having a bottom surface for regulating a position of a trailing end of the sheets, and, in the bottom surface, a surface on a lower side that comes into contact with the sheet conveyor belt is formed deeper than a surface on an upper side to form the step portion between the surface on the lower side and the surface on the upper side. Therefore, when a small number of sheets are discharged from a processing tray to a stacking tray, a trailing end of the sheets is located on the lower surface side of the concave surface of the bundle claw, where the trailing end of the sheets should be originally located, and does not move to the upper surface side of the concave surface of the bundle claw.

In some embodiments, a moving magnet type linear slider capable of minimizing the effect of microvibration at the time of driving a linear motor, easily increasing the servo gain and suppressing the speed ripple is provided. The moving magnet type linear slider includes a linear motor for reciprocating a table, and a detector for detecting the relative position of the table and a fixed base. The linear motor includes an armature in which polyphase armature winding is wound around the armature core secured to a fixed base and a field permanent magnet secured to the lower surface of the table in the vertical direction and arranged between the inner side surface of the linear guide and the outside surface of the armature via gaps therebetween. The detector includes a linear scale secured to the lower surface side of the table and a sensor head secured to the upper surface side of the armature, and the central axis of the detector is substantially aligned with the thrust central axis G-G of the armature.

An image forming apparatus detects a plurality of times by changing velocity of a photosensitive drum, color misregistration generated when a developing roller separates from a photosensitive drum and calculates a relation between the velocity of the photosensitive drum and the color misregistration. A velocity of the photosensitive drum is changed and an arbitrary peripheral velocity difference is set between the photosensitive drum and the intermediate transfer belt based on the calculated result.

An image forming apparatus including an image bearing member, an image forming device forming a latent image on the image bearing member and visualizing the latent image; a transfer device transferring the visual image onto a receiving material, using a moving member; a drive controller controlling driving of the image bearing member so that the rotation angular speed of the image bearing member is identical to the targeted rotation angular speed; a pattern detection device detecting pattern images formed on the moving member; and a correction device determining the variation in rotation angle or angular speed per one revolution of the image bearing member on the basis of the detection data and correcting the targeted rotation angular speed by superimposing a correction value to negate the variation in rotation angle or angular speed per one revolution of the image bearing member on the target.

A belt apparatus having an endless belt which is wound around and movably driven by a plurality of support rollers. The speed fluctuations of the endless belt due to the variations in thickness of the endless belt are prevented. A driving apparatus for driving the endless belt has a driving roller and an opposite roller facing with each other across the endless belt, and a driving motor for driving the driving roller, the driving roller and the opposite roller being in pressure contact with each other only at both end parts in their axial direction via the endless belt and the pressure contact part forming a plane.

The present invention provided a controller which effectively controls the velocity when starting a permanent magnet synchronous motor in synchronous operation mode. The controller for a permanent magnet synchronous motor, which is equipped with a permanent magnet synchronous motor that has a permanent magnet as a field, a voltage command maker which gets a voltage command to be applied to the above permanent magnet motor, according to a d-axis current command, a q-axis current command, and a frequency command, and a power converting circuit which applies voltage to the above permanent magnet synchronous motor, according to the above voltage command, detects the q-axis current of the permanent magnet synchronous motor when starting the above permanent magnet synchronous motor in synchronous operation mode, and applies gain to the detected q-axis current value, and subtracts the operation results from the above frequency command thereby modifying the frequency command.

The invention discloses a co-axial type radial thrust rod high speed indexing mechanism, comprising a box body, an input shaft and an output shaft. The axial lines of the input shaft and the output shaft are on a same line; the end part of the input shaft is fixed with a driving cirque which is provided with at least a pair of symmetrical radial through holes; the output shaft is fixedly connected with at least a pair of symmetrical cranks; the end part of the crank is respectively provided with at least one first roller; the box body is fixed with an internal profile conjugate cam; each pair of symmetrical through holes on the driving cirque are internally provided with a thrust rod respectively; one end of the thrust rod is provided with a second roller which is contacted with the internal profile conjugate cam; the other end of the thrust rod is in flat bottom structure which is contacted with the first roller at the end part of the crank. The indexing mechanism of the invention can be widely applied to automatic machines with large indexing number range, compact structure, large rigidity, high bearing force, coaxial input and output and high speed indexing intermittent motion, such as various machines of printing, packaging, foods, ceramics, pharmacy, military industries, etc.

The present invention pertains to a toothed belt equipped with a back section, a tooth section, and core wires embedded in the back section. The back section and the tooth section include a urethane resin composition, and the core wires are twisted cords comprising a group of glass fiber filaments, or are twisted cords comprising a group of polyarylate fiber filaments. When the core wires are twisted cords comprising a group of glass fiber filaments, the pitch of the tooth section is 0.45-0.60 mm, the diameter of the glass fiber filaments is 6-9 microns, and the wire diameter of the core wires is 0.14-0.20 mm. When the core wires are twisted cords comprising a group of polyarylate fiber filaments, the pitch of the tooth section is 0.45-0.71 mm, and the wire diameter of the core wires is 0.14-0.28 mm.

The invention relates to a device and a method for testing a force characteristic of a linear electric motor, which relate to the technical field of motor test, and aims at the main problems existing in various linear electric motor test devices at present. A pull pressure sensor is used for testing the output force of a linear electric motor to be tested, and is also used for testing the force applied to a rotor of the linear electric motor to be tested; a ball screw is used for converting gyroscopic motion of a loading servo motor into linear motion of the rotor of the linear electric motor to be tested, and comprises a nut, a screw rod and a fixed support; the loading servo motor is used for driving the screw rod of the ball screw to rotate and dragging the nut of the balls screw to do linear motion; a base is used for fixing a stator of the linear electric motor to be tested and the fixed support of the ball screw, so that the rotor of the linear electric motor to be tested driven by the nut of the ball screw and the stator of the linear electric motor to be tested fixed on the base are located at a normal working position of the linear electric motor; a guide rail is used for guiding and supporting the rotor of the linear electric motor to be tested to move on the base along the motion direction of the rotor of the electric motor; and a displacement sensor is used for measuring the displacement of the rotor of the linear electric motor to be tested.

An image forming apparatus driving unit includes a rotatable member which is rotatably supported, a pair of bearing portions for rotatably supporting the rotatable member, and a motor for driving the rotatable member. In addition, a driving gear is provided on a driving shaft of the motor, and a driven gear, provided outside the pair of bearing portions with respect to a rotational axis direction of the rotatable member, engages with the driving gear to be rotated integrally with the rotatable member. At least one of the driven gear and the driving gear has, with respect to the rotational axis direction of the rotatable member, a crown shape so that a central tooth surface of a tooth projects more than end tooth surfaces of the tooth at a side where the driven gear and the driving gear engage each other. During driving of the driving gear, a first position where a pressure received by the tooth surface is at a maximum and a second position where an amount of crowning formed on the driven gear or the driving gear is at a maximum are offset in a same direction.

The invention discloses a speed fluctuation suppressing method of a permanent magnet synchronous motor, which comprises the following steps: obtaining the target rotational speed and the feedback rotational speed of the permanent magnet synchronous motor, and calculating the fluctuation rotational speed of the permanent magnet synchronous motor according to the target rotational speed and the feedback rotational speed; The speed is iteratively learned and controlled to obtain the compensation speed, and the compensation speed is superimposed on the given speed of the previous control cycle of the permanent magnet synchronous motor to obtain the given speed of the current control cycle; according to the given speed of the current control cycle The magnetic synchronous motor is controlled to suppress the speed fluctuation of the permanent magnet synchronous motor. The suppression method obtains the compensation speed by performing iterative learning control on the fluctuation speed to correct the given speed of the speed loop, so as to effectively suppress the speed fluctuation of the permanent magnet synchronous motor during operation. The invention also discloses a control device of the permanent magnet synchronous motor and a compressor control system with the same.

The invention discloses a high-speed indexing mechanism of a front connection type cam connecting rod, comprising a box body, an input shaft and an output shaft. A conjugate cam is fixedly connected to the box body; the axes of the input shaft and the output shaft are on a same straight line; the transmission between the input shaft and the output shaft is realized by a parallel-connection combined cam connecting rod mechanism which consists of the conjugate cam and one or two sets of connecting rod mechanisms; each set of connecting rod mechanisms comprises an input rod fixedly connected to the input shaft and an output rod fixedly connected to the output shaft; a first connecting rod and a second connecting rod are sequentially hinged between the input rod and the output rod; a hinge point between the input rod and the first connecting rod is positioned in the middle area of the first connecting rod; and two ends of the first connecting rod respectively contact with inner outline lines of two cams in the conjugate cam. The invention can meet the working condition requirement of a high-speed automatic machine on realizing higher indexing frequency.

The invention discloses a permanent magnet synchronous motor self-adaptive continuous sliding mode control method based on load torque observation, comprising: establishing a permanent magnet synchronous motor mathematical model; using a high-order fast terminal sliding mode load torque observer to estimate permanent magnet synchronous The load torque of the motor system is used for feed-forward compensation of the speed controller of the permanent magnet synchronous motor; the design of the adaptive continuous fast terminal sliding mode permanent magnet synchronous motor drive controller obtains the q-axis reference current under the system disturbance; the maximum torque ratio is used The strategy calculates the q-axis reference current; obtains the dq-axis control voltage through the current controller, and finally drives the permanent magnet synchronous motor to rotate through the drive module. The control method of the present invention combines a high-order fast terminal sliding mode load torque observer and an adaptive continuous fast terminal sliding mode controller, which can not only effectively control the speed of the permanent magnet synchronous motor, but also effectively weaken the chattering caused by the sliding mode and improve the Speed ​​control accuracy and dynamic performance.

The invention provides a brake force real-time adjusting method based on a brake-by-wire system. The brake force real-time adjusting method comprises following steps: respectively obtaining objective position signal values of motors in various electronic and mechanical brakes of front wheels and / or rear wheels of a brake vehicle according to strokes of electronic brake pedals; respectively acquiring actual position signal values, actual rotation speed signal values and actual current signal values of the motors in real time; and respectively realizing real-time closed-loop control for positions, rotation speeds and current of the motors according to deviation between the objective position signal values and the actual position signal values of the motors, the actual rotation speed signal values and the actual current signal values, and accordingly adjusting actually outputted brake force of the electronic and mechanical brakes with the motors in real time. Correspondingly, the invention provides a brake force real-time adjusting device. The brake force real-time adjusting method and the adjusting device can suppress fluctuation generated when brake force is adjusted in real time in the prior art, stability of the brake-by-wire system is improved, and a braking effect is good.

A numerical controller suppresses change of a axis speed to be slow even when a lookahead distance varies with small steps. The numerical controller includes: a lookahead unit that looks ahead a plurality of instruction blocks from an NC program; an analysis unit that analyzes the looked ahead instruction blocks and creates motion instruction data; a target speed calculation unit that calculates a target speed of the axis based on a lookahead distance; an interpolation unit that generates interpolation data based on the motion instruction data and the target speed; and a servo control unit that controls a motor based on the interpolation data. The target speed calculation unit refrains from recalculation of the target speed when a change of the lookahead distance is within a margin.

The invention discloses a coaxial eccentric wheel high-speed indexing mechanism, which includes a box body, an input shaft and an output shaft. The drive ring is provided with at least one pair of symmetrical radial through holes; the output shaft is fixedly connected with an eccentric wheel; the box body is fixedly connected with an inner profile conjugate cam; each pair of The symmetrical radial through holes are respectively provided with push rods, and the two ends of the push rods are in contact with the eccentric wheel and the inner profile conjugate cam respectively; A roller is arranged on the end of the rod that is in contact with the conjugate cam of the inner profile.

An image forming apparatus including: an image bearing belt that bears an image; an image creation unit that transfers the image on the image bearing belt; a first driving source; a driving roller that is rotationally driven by the first driving source and causes the image bearing belt to move; a transfer roller that has a concaved portion in a circumferential surface, forms a transfer nip by the transfer roller making contact with the image bearing belt, and transfers the image on the image bearing belt to a recording material; a second driving source that rotationally drives the transfer roller; a material type determination unit that determines a type of the recording material; and a control unit that controls a rotational frequency of the transfer roller when the recording material is nipped by the transfer nip based on information of the type determined by the material type determination unit.

The invention discloses a device for restraining the vibration of a high-speed rolling mill by reducing the speed fluctuation of a rolling inlet of an aluminum foil. A frame is arranged at the front end of the mill equipment and at the rolling inlet of the aluminum foil. Two guide rollers and a tensioning roller are arranged in the frame, wherein the two guide rollers are mounted at the upper part of the frame; the tensioning roller is mounted at the lower part of the frame and between the two guide rollers; a small gear is mounted on a roll neck at one end of each guide roller; a big gear is mounted on the shaft neck of a flywheel; the flywheel is mounted in a flywheel mounting groove in the outer side of the frame; and the small gear on each guide roller and the big gear on the flywheel are matched in a gear engaging manner. The device provided by the invention has the advantages of simple mechanism structure and easiness in maintenance and repair, and has a good effect of restraining the speed fluctuation of the rolling inlet of the aluminum foil.