Motor torque control device and torque control system

Abstract

Embodiments of the present application provide a torque control device and a torque control system for a motor, the torque control device includes: a torque calculation unit, which calculates the torque of the motor according to the rotation speed and output power of the motor; and A q-axis current command value calculation unit that calculates a q-axis current command value based on a torque command and the torque calculated by the torque calculation unit. According to the application, torque control can be carried out with high precision during operation of the electric motor independently of the parameters of the induction motor and in a simple manner.

Description

Technical field [0001] The present application relates to the field of electromechanical, and more particularly to a torque control device and a torque control system of an electric motor. Background technique [0002] When the motor is running, it is necessary to torque control of the motor, that is, according to the torque command, generate current command and voltage command for controlling the operation of the motor, these current commands and voltage commands are further calculated to control the inverter generation. The output current used to drive the motor. [0003] figure 1 A schematic diagram of the prior art torque control device, such as figure 1 As shown, in the existing torque control device, torque command Multiply the torque coefficients calculated according to the parameters of the induction motor t Recall 1 / k t To get Q-axis current command values Calculate the feedback signal I of the Q-axis current q Q-axis current command value Deviation, and proportion...

AI Technical Summary

Problems solved by technology

[0008] The inventors of the present application found that in the existing torque control device, since parameters such as magnetic flux and secondary resistance value that cannot be directly measured are used, there is a problem that the error of the parameters is large. As a result, the control of the torque In addition, due to the improvement of automatic tuning technology, the detection accuracy of the parameters of the induction motor will be improved, but the secondary resistance value of the induction motor will change after the winding temperature rises, so in the case of continuing to use the motor, there is a problem with the The problem that the torque accuracy gradually deteriorates at the beginning of operation; in addition, the control device of the above-mentioned Patent Document 1 is relatively complicated, and a simpler and more accurate torque control device is desired

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