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Judgment method for initial position of permanent magnet synchronous motor rotor

A technology of rotor initial position and permanent magnet synchronous motor, which is applied in the direction of control of generator, motor generator control, and electromechanical transmission device, etc., can solve the problem that the permanent magnet synchronous motor system cannot work reliably, and achieve good practical value, The system is simple and stable, and the effect of magnetization and demagnetization is small

Inactive Publication Date: 2012-12-26
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

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

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  • Judgment method for initial position of permanent magnet synchronous motor rotor
  • Judgment method for initial position of permanent magnet synchronous motor rotor
  • Judgment method for initial position of permanent magnet synchronous motor rotor

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Embodiment Construction

[0020] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0021] Such as figure 1 As shown, the present invention provides a method for judging the initial position of the permanent magnet synchronous motor rotor, comprising the following steps:

[0022] (1) Establish a coordinate system relationship diagram, such as figure 2 As shown, d-q is the actual synchronous rotating coordinate system, In order to estimate the synchronous rotating coordinate system, α-β is the actual two-phase stationary coordinate system, and define the estimated position error Among them, θ is the actual position, is the estimated position, and The initial value of is 0;

[0023] (2) in Estimation of the synchronous rotating coordinate system Inject high-frequency voltage signal on the shaft as Shaft voltage given, where, U mh Indicates the voltage amplitude of the injected signal, ω h represents the a...

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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.

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...

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Application Information

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IPC IPC(8): H02P21/14H02P21/32
Inventor 赵承亮周波刘颖李洁程丽雯
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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