Torque control apparatus and torque control system of motor

Abstract

The embodiment of the invention provides a torque control apparatus and torque control system of a motor. The torque control apparatus of a motor includes a torque calculating unit and a q axis current command value calculating unit, wherein the torque calculating unit calculates the torque of the motor according to the rotating speed and the output power of the motor; and the q axis current command value calculating unit calculates the q axis current commend value according to a torque commend and the torque calculated by the torque calculating unit. The torque control apparatus and torque control system of a motor cannot depend on parameters of an induction motor, and can control the torque, with high accuracy, during the running process of the motor in a simple mode.

Description

technical field [0001] The application relates to the electromechanical field, in particular to a torque control device and a torque control system for an electric motor. Background technique [0002] When the motor is running, it is necessary to control the torque of the motor, that is, according to the torque command, generate a current command and a voltage command for controlling the operation of the motor, and these current commands and voltage commands are further calculated to control the inverter to generate The output current used to drive the motor. [0003] figure 1 A schematic diagram of a torque control device in the prior art is shown, such as figure 1 As shown, in the existing torque control device, the torque command Multiply by the torque coefficient K calculated from the parameters of the induction motor t The reciprocal of 1 / K t To get the q-axis current command value Calculate the feedback signal i of the q-axis current q and q-axis current comma...

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

Images