Perpetual magnet synchronous motor control method and control device and air conditioner

Abstract

The embodiment provides a perpetual magnet synchronous motor control method and control device and air conditioner, can at the running of a motor selecting the most suitable control means of a vertical shaft current, reducing the loss of the starting of a compression engine; the method includes, capturing a tonal modification rate; according to the tonal modification rate ascertaining the control means of the vertical shaft current, when the tonal modification rate satisfying the condition of the control means of a weak magnet, using the control means of the weak magnet to generate an order value of the vertical shaft current; when the tonal modification rate satisfying the condition of the control means of the lowest copper loss, using the control means of the lowest copper loss to generate an order value of the vertical shaft current; according to the order value of a preset motor rotating speed and the rotating speed of the motor calculating the order value of a reciprocal shaft current; according to the vertical shaft current and the order value of the vertical shaft current calculating the run time value of the vertical shaft current; according to the reciprocal shaft current and the order value of the reciprocal shaft current calculating the run time value of the reciprocal shaft current; according to the run time value of the vertical shaft current and the run time value of the reciprocal shaft current and the angle of the perpetual magnet synchronous motor rotary generating a six route drive signal for controlling the perpetual magnet synchronous motor. The perpetual magnet synchronous motor is applied in tonal modification air conditioners.

Description

technical field [0001] The invention relates to the field of air conditioners, in particular to a permanent magnet synchronous motor control method, a control device and an air conditioner. Background technique [0002] As we all know, my country's power grid voltage is 220 volts, 50 Hz, and the air conditioner working under this condition is called "fixed frequency air conditioner". Since the power supply frequency cannot be changed, the speed of the compressor of the traditional fixed-frequency air conditioner is basically unchanged. The indoor temperature is adjusted by relying on the compressor to be continuously "on and off". And consume more power. Based on this consideration, the "inverter air conditioner" with variable motor speed in the compressor gradually appeared. The motor of the compressor in the inverter air conditioner generally uses a permanent magnet synchronous motor. This motor can change the speed under the control of the control device. The rotation s...

AI Technical Summary

Problems solved by technology

However, with the rapid advancement of technology, the energy efficiency level requirements of inverter air conditioners are getting higher and higher, and the requirements for designers are also getting higher and higher. The original control method of only using the field weakening control method to control the direct axis current is more suitable. It is used when the motor speed is very high. When the motor speed is relatively low, the use of field weakening control cannot meet the current low loss requirements, so a control method is needed to control the direct axis current when the motor speed is low. The field weakening control mode is switched to meet the requirements of low loss

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