Method and device for identifying motor magnetic pole pair number of mechanical periodic load

Abstract

The invention discloses a method for identifying a motor magnetic pole pair number of a mechanical periodic load. The method comprises the following steps that: a control motor runs at a preset given speed, and a coordinate converter converts a d shaft reference current and a q shaft reference current into a three-phase reference current transmitted to an inverter, wherein the d shaft reference current is zero, and the q shaft reference current is a preset current; then a three-phase working current of a motor is collected with a preset sampling frequency, and the collected three-phase working current is converted into a d shaft working current and a q shaft working current; conversion from a time domain to a frequency domain is carried out on the q shaft working current having preset sampling points, and frequency domain signals are generated; the frequency of a harmonic coefficient having the largest amplitude in the frequency domain signals is obtained; and according to the frequency and the preset given speed, the magnetic pole pair number of the motor is calculated. The invention further discloses a device for identifying the motor magnetic pole pair number of the mechanical periodic load. According to the invention, the motor magnetic pole pair number of the mechanical periodic load is automatically identified, and the universality of a motor control circuit is improved.

Description

technical field [0001] The invention relates to the field of magnetic pole logarithm identification, in particular to a method and device for identifying the magnetic pole logarithm of a motor with mechanical periodic loads. Background technique [0002] With the development of the control industry, the permanent magnet synchronous motor has become the mainstream in the field of frequency conversion control due to its small size, light weight, and high energy efficiency. In the field of frequency conversion control, mechanical periodic loads account for a large proportion, such as compressors, pumping units, etc., and because the types of such equipment continue to increase, it is necessary to equip different control boards for different types of equipment, resulting in The rapid growth of device control board models has brought enormous pressure on product after-sales and inventory. Moreover, in the case of identical hardware, sometimes multiple sets of control boards have...

AI Technical Summary

Problems solved by technology

Because, in some engineering applications, the number of pole pairs used to control the motor is not unique. At present, the number of pole pairs of the motor mainly includes two pairs of poles and three pairs of poles. If the control board cannot automatically identify the number of pole pairs of the control motor , will not be able to control

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