Control method and control device for inputting belt speed again of permanent magnet synchronous motor

Abstract

The invention discloses a control method and control device for inputting belt speed again of a permanent magnet synchronous motor. The method comprises the steps of inputting a first control signal to a control end of an inverter so that an AC end of the inverter outputs a first voltage equivalent to a compensation voltage value when that a voltage exists in a power grid bus is detected, wherein the compensation voltage is acquired according to a current of an electrical end of the permanent magnet synchronous motor and a counter potential of the permanent magnet synchronous motor; inputting a second control signal to the control end of the inverter so that the AC end of the inverter outputs a second voltage equivalent to a working voltage, wherein the working voltage is acquired according to a preset current of a stator winding; and inputting a closed-loop control signal to the control end of the inverter so that the inverter enters closed-loop control. According to the method, an impact current during inputting again is eliminated by compensation current at an inputting moment; and according to the method, the impact current is eliminated by a software algorithm without adding other additional hardware on the condition of no influence on normal working of the permanent magnet synchronous motor, and the safety and the stability of a motor system are remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of permanent magnet synchronous motor control, and more specifically relates to a control method and a control device for re-introduction of a permanent magnet synchronous motor with speed. Background technique [0002] Permanent Magnet Synchronous Motor (PMSM) has the characteristics of simple structure, small size, high efficiency and large torque. The permanent magnet synchronous motor drive system takes PMSM as the object, and controls the drive system of the permanent magnet synchronous motor through the controller and the frequency converter. The permanent magnet synchronous motor drive system can achieve high precision, high dynamic performance, and a wide range of speed regulation and control, so it is widely used in various speed regulation fields. [0003] In the application field of traction motors, due to factors such as power supply lines and regions, there are often non-electric areas of varyi...

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Problems solved by technology

[0008] In view of the above defects, the present invention provides a control method and control device for permanent magnet synchronous motor with speed re-introduction, aiming to solve the problem of the inverter and permanent magnet synchronous motor due to the out-of-control of the existing control method due to the saturation of the PI controller. Large voltage difference and then the technical problem of introducing inrush current to the permanent magnet synchronous motor and inverter

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