Method for identifying different models of alternating current motors

Abstract

The invention discloses a method for identifying different models of alternating current motors. Firstly alternating current of the same frequency and amplitude is injected into the stator windings of different models of alternating current motors under identification, then current of all phases of stator windings of all the alternating current motors under identification is acquired respectively and then the acquired current of all phases of stator windings of all the alternating current motors is converted into current under a two-phase static coordinate system through Clark transform, and finally the amplitude of the current vectors of each alternating current motor under the two-phase static coordinate system is calculated and different models of alternating current motors are identified according to the amplitude of the current vectors. The problems existing in the present identification method are overcome, additional arrangement of hardware is not required and the accuracy of the identification result is high.

Description

technical field [0001] The invention belongs to the technical field of motor control, and in particular relates to a method for identifying different types of AC motors. Background technique [0002] In the field of frequency conversion household appliances such as washing machines, air conditioners, and refrigerators, the same model often needs to use multiple types of frequency conversion motors. In order to ensure the optimal performance of each type of frequency conversion motor, each type of frequency conversion motor needs to be matched. For variable frequency drives, if there is a frequency converter that can identify all types of motors, and then run the algorithm for this motor in the frequency converter software, it is possible to realize that one frequency converter can match all types of motors while giving full play to the optimal performance of the motor. motor. [0003] A motor identification method currently used in the market is to put a resistor on each ty...

AI Technical Summary

Problems solved by technology

[0005] If you want to identify the motor through the number of pole pairs and the back electromotive force, you need to rotate the motor. Since you don’t know what kind of motor it is, it must run in an open loop, and the open loop operation cannot guarantee the reliable operation of the motor. The motor may lose its step, resulting in The recognition result is inaccurate, and additional energy consumption is increased

In addition, some applications (such as washing machines) do not allow the motor to run during identification, so this method has great limitations

[0006] If you want to identify the motor through resistance and inductance, you can add direct current to the winding. Due to the existence of inductance, the current will rise slowly. Due to the differences in the parameters of different motors, the rising time of the current is not the same. You can identify the motor through the rising time, but this The method can only be used when the temperature of the motor is at room temperature. If the motor has been working for a period of time, the temperature of the motor is high at this time, because the resistance will change with the temperature, and the recognition result at this time will not be accurate.

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