4 results about "Torque ripple" patented technology

A brushless motor capable of high speed rotation by field weakening operation is designed to reduce torque ripple at a maximum load point with current phase advance so that the torque ripple at the maximum load point is 1 to 1.5 times the torque ripple at a low speed load point.

The invention discloses an SRM torque ripple suppression control system and method based on a Fourier neural network, and the method comprises the steps:a Fourier neural network frequency spectrum detection module is built according to the relation between a torque and an actual output torque, and a frequency spectrum containing the content of each harmonic in an output torque signal of the Fourier neural network is rapidly obtained online; dynamic characteristics of torque are considered in a combined mode, a signal generator for reference torque compensation is designed according to torque harmonic information and historical torque harmonic information which are obtained online, output of the signal generator compensates reference torque output by a speed controller, harmonic information corresponding to undesired output torque ripple caused by the reference torque is eliminated, and more ideal reference torque is obtained; and under the cooperation of the torque distributor and the current inner loop control, the amplitude of each harmonic of the output torque of the control system is greatly reduced, and the torque ripple is effectively restrained.

The invention discloses a magnetic coding permanent magnet synchronization method used for driving of an electric vehicle. The method is characterized in that the method includes following steps: when a motor shaft rotates, a magnet arranged at the head of the motor shaft performs circumferential magnetic field scanning on a magnetic encoder chip, and sensors uniformly distributed in the magnetic coding chip perform sampling on a circumferential magnetic field through a chip internal logic circuit. According to the method, the torque ripple is reduced to the minimum, since the identification position precision of the chip is high, the identifiable rotor position precision reaches +/-0.35 degree which is higher than that of the prior art, jittering can be prevented when the motor operates in a low speed, and high torque can be output.

A double high axial motor capable of effectively reducing back electromotive force torque pulsation comprises a sectional armature (1), a rotor disc (2), a bearing pressure plate (3), an iron core (4) and a stator bar (5), and is characterized in that the iron core (4) of the sectional armature (1) adopts an axial motor separation design, a bearing is fixed on a stator by the bearing pressure plate (3), the iron core (4) is fixed by the sectional armature (1) through the stator bar (5), and an external motor case is connected; the iron core (4) is made of a soft magnetic composite material, arc-shaped surfaces are designed in sequence according to different pole numbers, the part close to a wire inlet end is small in radian or is not arranged, and the part far away from the wire inlet end is appropriate in radian, so that the salient pole rate is improved, the influence of inter-pole resistance on counter electromotive force is reduced, and the permanent magnets can be effectively utilized; materials are saved, and power and torque are improved.