A control method for a voltage-regulating and magnetic-regulating motor

Abstract

The invention discloses a control method for a voltage-regulating and magnetic-regulating motor, which belongs to the technical field of motor control. The invention takes AC motors such as asynchronous motors, sine wave permanent magnet synchronous motors, and square wave brushless DC motors as control objects, takes air gap flux linkage and instantaneous torque as control variables, and adds a capable motor to the front stage of the three-phase inverter bridge. A DC / DC converter that outputs a variety of discrete DC levels controls the rotation speed of the air-gap flux linkage by switching the level of the front-end converter to realize voltage regulation and magnetic regulation, which effectively reduces the chopping frequency and can achieve a soft start. The method does not need a position sensor, is simple to control, and can simultaneously adapt to AC motors such as asynchronous motors, sine wave permanent magnet synchronous motors and square wave brushless DC motors, and has strong versatility.

Description

technical field [0001] The invention relates to the technical field of motor control, in particular to a method for controlling a voltage-regulating and magnetic-regulating motor. Background technique [0002] In recent years, in the field of transmission, the era of mechanical tradition, hydraulic tradition, pneumatic tradition and electric transmission is gradually transitioning to an era dominated by electric tradition. One of the core components of the electric tradition is the motor drive. High-performance motor drives have always been a research hotspot in the transmission field. [0003] At present, the main idea of ​​the method to improve the performance of the drive is to improve efficiency, improve reliability, increase speed range, improve control accuracy and simplify the algorithm. Improving efficiency means reducing losses. The losses here are mainly switching losses, iron losses, and copper losses. The key to improving reliability includes three issues of s...

AI Technical Summary

Problems solved by technology

[0004] The existing motor control method often directly performs chopper control on the inverter. Firstly, the switching frequency is high, not only the switching loss is large, but also a high speed regulation range cannot be realized.

The second is that it is a hard start when starting, which is not suitable for motors with small inductance. However, motors with small volume and weight often have small inductance, so reliable starting and small size and light weight will become a contradiction.

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