A method for judging the initial position of a permanent magnet synchronous motor rotor

A technology of rotor initial position and permanent magnet synchronous motor, which is applied in the direction of controlling generator, motor generator control, controlling electromechanical transmission device, etc. The system is simple and stable, and the effect of magnetization and demagnetization is small.
CN102843091BInactive Publication Date: 2015-08-12NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Publication Date
2015-08-12
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a judgment method for an initial position of a permanent magnet synchronous motor rotor. The judgment method comprises the following steps: firstly using a pulsating high-frequency voltage injection method to acquire a primarily estimated rotor position; and then injecting a disturbing signal in a positive direction on a primarily estimated quadrature axis to estimate the rotor position; and finally, judging the polarity of a magnetic pole according to the estimated rotation speed direction, so as to acquire the initial position of the motor rotor. The judgment method can solve the convergence problem of the polarity of the magnetic pole when the pulsating high-frequency voltage injection method is adopted to detect the initial position of the rotor, so that the initial position of the rotor can be effectively estimated without injecting pulse current in the positive direction on the direction axis.
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Description

technical field

[0001] The invention belongs to the field of permanent magnet motor control, in particular to a method for judging the initial position of a permanent magnet synchronous motor rotor. Background technique

[0002] Regardless of whether the permanent magnet synchronous motor adopts direct torque control or vector control, it is necessary to obtain the position of the rotor accurately. In the traditional method of detecting the position and speed of the motor rotor, mechanical sensors, such as photoelectric encoders or resolvers, are often used, so that the permanent magnet synchronous motor system cannot work reliably in some special occasions with harsh environments, such as aerospace, underwater, etc. and air-conditioning compressors. Therefore, sensorless control technology emerges at the historic moment. At present, the position sensorless control technology can be divided into two categories according to the basic principles: one is based on the fundamen...

Claims

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