Motor pole pair number identification control method

Abstract

The invention belongs to the air-conditioner control technical field and discloses an identification control method of the number of the pole-pairs of a motor. With the method adopted, problems in automatic acquisition of the number of the pole-pairs of a variable frequency motor can be solved. According to the method, the motor is controlled to operate under a given operating frequency f0; spectrum analysis is performed on input signals with identical motor rotation speed and motor rotor position fluctuation through using Fourier analysis techniques, and the fundamental frequency f1 of input signals corresponding to a maximum amplitude in a spectrum is found out; and f1 is divided by f0, and an obtained division result is rounded, so that the number p of the pole-pairs of the motor is obtained. The method of the present invention is suitable for determining the number of the pole pairs of the motor of an air conditioner.

Description

technical field [0001] The invention relates to an air conditioner control technology, in particular to a motor pole pair identification control method. Background technique [0002] The traditional variable frequency motor control technology requires the motor manufacturer to provide parameters such as the number of motor pole pairs, such as the motor control torque expression The number of motor pole pairs p is required, and the motor dynamics equation When ω is the angular velocity corresponding to the electrical frequency of the motor, it is necessary to know the pole logarithm p of the motor, and the relationship between the mechanical angle and the electrical angle of the motor also has a multiple of the pole logarithm. When a large number of different motors need to be controlled, the motor parameters are often stored in a similar EEPROM, and the control program is kept unchanged, which can solve the control of motors such as different compressors, but this method ...

AI Technical Summary

Problems solved by technology

When a large number of different motors need to be controlled, the motor parameters are often stored in a similar EEPROM, and the control program is kept unchanged, which can solve the control of motors such as different compressors, but this method has the following technical problems: one is the need EEPROM increases the cost of hardware. Second, when the user’s inverter air conditioner has a problem and needs to be repaired, if the original control board is replaced with a new control circuit or new control software, the specific parameters of the motor may not be known. , unable to quickly replace the motor control circuit and control software

[0003] The Chinese patent with the application number 201410226426.9 introduces the pole logarithm acquisition method. Its shortcomings mainly include four points: 1. The principle and method are not clearly introduced; 2. Due to the need to calculate the maximum amplitude of the nth harmonic current, When n is very large, the amount of calculation is very large, and the purpose of obtaining the number of pole pairs of the motor by real-time calculation cannot be achieved; 3. Since the calculated number of pole pairs generally includes decimals, however, the patent 201410226426.9 directly takes the calculated number of pole pairs to a high position Integer, if the calculated pole logarithm is 2.1, take the pole logarithm as 3, which will obviously make mistakes; 4. The method cannot recognize the pole logarithm of more than 4 pairs of poles

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