Permanent magnet motor controller and method for electrolytic capacitorless motor drive system

Abstract

The invention discloses a permanent magnet motor controller used for an electrolytic capacitor-free motor drive system and a method. Harmonic currents are injected to the electrolytic capacitor-free motor drive system for three times, the input side power pulsating quantity of the electrolytic capacitor-free motor drive system is reduced, decoupling of an electrolytic capacitor-free motor drive system input side control objective and a motor side control objective is realized, the problem that original power of a system is unbalanced is solved, the electrolytic capacitor-free motor drive system can obtain a high input power factor approximate to 1, thereby effectively suppressing fluctuation of a bus capacitor voltage, reducing a fluctuation coefficient of a DC bus voltage, and providing conditions for high-performance operation of a motor; and repetitive control is introduced into a speed loop of vector control, a rotation speed loop of the motor is improved, and on this basis, an SVPWM modulation module is utilized to generate six paths of instructions to control motor operation, thereby effectively solving the problem of poor output accuracy under a bus voltage fluctuation working condition, and realizing rapid and stable output of the controller.

Description

technical field [0001] The invention belongs to the technical field of motor control, in particular to the control technology of a non-electrolytic capacitor motor drive system. Background technique [0002] Permanent magnet synchronous motors have the advantages of simple structure, high power density, and convenient maintenance. They have gradually replaced DC motors and asynchronous motors in the fields of household appliances, industrial production, and automobile drives. The drive system used in this type of motor generally adopts a voltage source inverter. This voltage source inverter uses a large-capacity electrolytic capacitor to absorb and release a large amount of energy to maintain a stable DC bus voltage and provide a high-performance motor for high-performance operation. condition. However, large-capacity electrolytic capacitors have shortcomings such as short life and poor thermal stability. The life of large-capacity electrolytic capacitors is generally 8000h...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problems existing in the existing electrolytic capacitor drive system, and propose a permanent magnet motor controller for the electrolytic capacitor motor drive system to solve the problem in the electrolytic capacitor drive system with the control method of the controller. The contradiction between the small capacitor value and the fluctuation of the DC bus voltage and improve the power factor of the input side of the system, and improve the static and dynamic performance of the motor on this basis

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