Method and device for reducing motor torque ripple

Abstract

The invention discloses a method and a device for reducing motor torque ripple. An augmented system is constructed in a position domain by adopting an electrical angle of a motor as an independent variable, a finite element mesh is constructed by adopting an electrical angular velocity of the motor as an intermediate parameter, a stabilizer is designed for the augmented system, an infinite-dimensional matrix inequality is transformed into a finite-dimensional matrix, a first target control parameter matrix and a second target control parameter matrix are obtained according to motor position sampling signals obtained periodically, output quantity is calculated according to updated control parameter matrixes and motor current value, motor operation is controlled according to the output quantity, the motor torque ripple is reduced, that is, reduction of the motor torque ripple is associated with tracking control based on a turning angle variation system, so that the motor torque ripple isreduced effectively, power loss is reduced, system efficiency is increased, and driving comfort is improved.

Description

technical field [0001] The invention relates to the technical field of motor control, in particular to a method and device for suppressing motor torque ripple. Background technique [0002] When the automotive electronic controller system uses the motor as the actuator to perform various functions, the phenomenon of motor torque ripple is common. For example, when the EPS (Electric Power Steering, electric power steering controller) system realizes the electric power steering function of the car, if the driver manipulates the steering wheel, it is necessary to ensure the synchronous relationship between the motor speed and the steering wheel speed, as well as the motor speed and the stator voltage fundamental wave. Frequency synchronization relationship, which requires speed regulation of motor stator voltage, but speed regulation depends on power electronic devices, and the power electronic devices on which speed regulation depends are non-ideal characteristics, which will ...

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Problems solved by technology

For example, when the EPS (Electric Power Steering, electric power steering controller) system realizes the electric power steering function of the car, if the driver manipulates the steering wheel, it is necessary to ensure the synchronous relationship between the motor speed and the steering wheel speed, as well as the motor speed and the stator voltage fundamental wave. Frequency synchronization relationship, which requires speed regulation of motor stator voltage, but speed regulation depends on power electronic devices, and the power electronic devices on which speed regulation depends are non-ideal characteristics, which will cause distortion of motor stator voltage, resulting in Torque ripple, which in turn increases power loss, reduces system efficiency, and even causes vehicle shaking, reducing driving comfort

[0003] At present, the existing motor torque ripple suppression method mainly adopts the scheme of compensating the dead zone voltage of the inverter, but it belongs to the general motor torque ripple suppression technology. For EPS, the frequency changes with the change of the steering wheel speed. The system, its suppression effect on the torque ripple is not obvious enough

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