Initial phase position and phase sequence detection method of motor and permanent magnet synchronous motor control system

Abstract

The invention provides an initial phase position and phase sequence detection method of a motor and a permanent magnet synchronous motor control system. The initial phase position and phase sequence detection method of the motor is applied to the permanent magnet synchronous motor control system. The method provided by the invention comprises the following steps: using an encoder to respectively obtain first displacement data of a motor rotor rotating to a Q axis, second displacement data of the motor rotor rotating from the Q axis to a D axis, third displacement data of the motor rotor rotating from the D axis to a -Q axis, and fourth displacement data of the motor rotor rotating from the -Q axis to the D axis in sequence; according to the second displacement data, the fourth displacementdata, and the line value of the encoder, obtaining initial phase position information of the motor to be detected; and according to the first displacement data, the second displacement data, and theline value of the encoder, determining a phase sequence of the motor to be detected. That is to say, according the method provided by the invention, not only the initial phase position of the rotor can be automatically detected, but also a motor wiring phase sequence can be automatically detected; in addition, influence caused by the friction is overcame, and the detection accuracy of the initialphase position is improved.

Description

technical field [0001] The invention relates to the technical field of motors, in particular to a method for detecting the initial phase and phase sequence of a motor and a control system for a permanent magnet synchronous motor. Background technique [0002] In many occasions, the permanent magnet synchronous motor needs to be connected according to the uvw phase sequence of the motor to be able to control normally. This will make the user stick to the fixed wiring method. Once the connection is wrong, it will cause abnormal operation of the motor, which may seriously cause personnel casualties. Moreover, many detection methods are done manually and cannot be realized automatically, and currently lack the function of phase sequence detection. In addition, many current detection methods for the initial phase of the motor have low precision, which affects the operating efficiency of the motor, and only by accurately obtaining the initial phase of the rotor can the motor exer...

AI Technical Summary

Problems solved by technology

[0002] In many occasions, the permanent magnet synchronous motor needs to be connected according to the uvw phase sequence of the motor to be able to control it normally. This will make the user stick to the fixed wiring method. Once the connection is wrong, it will cause the motor to run abnormally, which may seriously cause personnel accidents. casualties

And many detection methods are done manually and cannot be realized automatically, and currently lack the function of phase sequence detection

In addition, many current detection methods for the initial phase of the motor have low precision, which affects the operating efficiency of the motor, and only by accurately obtaining the initial phase of the rotor can the motor exert its maximum torque performance

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