Method and system for controlling motor speed

Abstract

The invention discloses a method and system for controlling the rotational speed of a motor. The electromagnetic torque output by the motor and the rotational speed of the motor at the previous moment are obtained, and the preset given rotational speed and the rotational speed of the motor at the previous moment are integrally calculated to obtain the given electromagnetic torque. Torque, input the given electromagnetic torque, preset given speed, preset cut-off frequency and motor output electromagnetic torque to the pre-established motor speed model to get the current motor speed, based on the current motor speed, Perform motor speed control operation. Through the above solution, based on the pre-established motor speed model, the current motor speed is obtained, which is the optimized motor speed, and the motor speed control operation is performed based on the optimized motor speed. In addition, by enhancing the damping of the motor speed control system, the motor speed at the current moment follows the preset given speed, preventing the phenomenon of speed overshoot and oscillation, which is beneficial to the stability of the motor speed control system.

Description

Technical field [0001] The present invention relates to the field of motor speed, and more particularly to a motor speed control method and system. Background technique [0002] The motor speed control system of the electric vehicle is controlled by the motor controller. Typically the speed control of the motor controller uses a PI regulator. [0003] The PI regulator is a linear controller that constitutes a control deviation according to a given value and the actual output value, and the proportion of control deviation and integration constitute a control amount through a linear combination, and controls the speed of the motor. [0004] Due to the simple control algorithm of the PI regulator, although the conventional speed requirements can be met, in the process of controlling the speed, the actual speed value exceeds the speed ultra-tuning phenomenon and the actual speed value of the actual speed value exceeding the fixed speed value. Change the oscillation phenomenon, which ...

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Problems solved by technology

[0004] Due to the simple control algorithm of the PI regulator, although it can meet the conventional speed requirements, in the process of controlling the speed, it is easy to appear the speed overshoot phenomenon that the actual speed value exceeds the given speed value and the actual speed value is around the given speed value. The changing oscillation phenomenon is not conducive to the stability of the motor speed control system

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