Rotational speed synchronous control device and control method of multi-switch reluctance motor

Abstract

The invention discloses a rotational speed synchronous control method of a multi-switch reluctance motor. The rotational speed synchronous control method comprises the following steps of calculating a rotational speed of a virtual main shaft, taking the rotational speed as a given rotational speed of each motor; calculating weight average rotational speed of each motor, and taking the weight average rotational speed as a reference rotational speed of each motor torque compensation module; calculating a reference torque of each motor, and comparing the reference torque with an actual torque of the motor to obtain corresponding torque deviation; calculating a corresponding compensation torque of each motor, and adding the corresponding compensation torque to the torque deviation to obtain torque regulation quantity of each motor; comparing actual flux of the motor with given flux of a system to obtain flux deviation; controlling the motor according to the torque regulation quantity and the flux deviation so that accurate tracking on the given rotational speed of the system by the actual rotational speed of each motor can be achieved and the purpose of synchronous running at various motor rotational speeds is achieved. The invention also discloses a rotational speed synchronous control device of the multi-switch reluctance motor.

Description

technical field [0001] The invention relates to the field of switched reluctance motor control, in particular to a multi-switch reluctance motor speed synchronous control device and control method. Background technique [0002] Switched reluctance motors have been popularized and applied rapidly in recent years because of their advantages such as simple and firm structure, small starting current, large starting torque, and high efficiency. However, in some complex multi-motor transmission systems, the synchronous operation of multiple motors is involved, so it is necessary to implement synchronous control of the speed of multiple motors. At present, some research work has been carried out on the speed synchronization control of multi-switched reluctance motors, and various control methods such as master control, master-slave control, coupling control and virtual spindle control have been proposed. There are still deficiencies: if the master command controls each movement ax...

AI Technical Summary

Problems solved by technology

At present, some research work has been carried out on the speed synchronization control of multi-switched reluctance motors, and various control methods such as master control, master-slave control, coupling control and virtual spindle control have been proposed. Although certain control effects have been obtained, but There are still deficiencies: if the master command controls each movement axis to work in parallel and is independent of each other, when one of the axes is disturbed, it can only be adjusted by the axis itself, and the other axes will not respond. In rare occasions; master-slave control is similar to master control, except that the motion axis is divided into master axis and slave axis. The reference signal of the slave axis comes from the output of the master axis. When the master axis is disturbed, the slave axis can make corresponding adjustments. When the slave axis is disturbed, the master axis will not respond accordingly; although the coupled control solves the problem of no coupling between the motors in the above method, the overall stability of the system changes due to the introduction of inter-axis parameter coupling. Poor; the virtual main shaft simulates the physical characteristics of the mechanical hard shaft connection, so it has similar inherent synchronization characteristics, but the virtual main shaft will produce out-of-synchronization phenomena during load disturbance, startup or shutdown, etc.

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