Virtual damping winding-based motor control method of permanent magnet synchronous motor

Abstract

The invention discloses a virtual damping winding-based motor control method for a permanent magnet synchronous motor, and relates to the field of permanent magnet synchronous motors, the method is improved to obtain an equivalent voltage equation of the permanent magnet synchronous motor containing an action item of a virtual damping winding, and then the permanent magnet synchronous motor is controlled based on the equivalent voltage equation. Therefore, the effect of the physical damping bar can be simulated through a control method of the virtual damping winding, so that the oscillation suppression and disturbance rejection capabilities of the damping bar can be maintained on the premise of not influencing the torque density of the permanent magnet synchronous motor, and the effects of improving the damping characteristic of the motor, reducing the amplitude of oscillation and improving the response speed of the system are achieved.

Description

technical field [0001] The invention relates to the field of permanent magnet synchronous motors, in particular to a motor control method based on a virtual damping winding of a permanent magnet synchronous motor. Background technique [0002] Due to the advantages of high power density and high efficiency, permanent magnet synchronous motors have been widely used in electric vehicles and other fields. However, when it runs at high speed, the damping of the permanent magnet synchronous motor is very small. If it is affected by factors such as parameter changes and external disturbances, the permanent magnet synchronous motor is prone to oscillation, which reduces the dynamic performance of the system. At present, in electric vehicles, the dynamic performance of permanent magnet synchronous motors is improved to a certain extent by installing damping strips on the permanent magnet synchronous motor rotors, but this approach will significantly reduce the torque density of perm...

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Problems solved by technology

However, when it runs at high speed, the damping of the permanent magnet synchronous motor is very small. If it is affected by factors such as parameter changes and external disturbances, the permanent magnet synchronous motor is prone to oscillation, which reduces the dynamic performance of the system.

At present, in electric vehicles, the dynamic performance of permanent magnet synchronous motors is improved to a certain extent by installing damping strips on the permanent magnet synchronous motor rotors, but this approach will significantly reduce the torque density of permanent magnet synchronous motors. Two aspects It is difficult to balance the performance of

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