Method and device for identifying initial position of permanent magnet synchronous motor rotor in static state
A permanent magnet synchronous motor, static state technology, used in the control of electromechanical transmission, control of generators, motor control, etc., can solve the problems of long detection time and misjudgment of polarity.
Active Publication Date: 2018-12-28
合肥阳光电动力科技有限公司
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[0005] The invention provides a method and device for identifying the initial position of the rotor of a permanent magnet synchronous motor in a static state, so as to solve the problems of long detection time and polarity misjudgment in the prior art
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[0055] In order to make the above objects, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0056] The invention provides a method for identifying the initial position of a rotor of a permanent magnet synchronous motor in a stationary state to solve the problems of long detection time and polarity misjudgment in the prior art.
[0057] Specifically, the method for identifying the initial position of the permanent magnet synchronous motor rotor in a static state, such as figure 1 shown, including:
[0058] S101. Injecting a rotating high-frequency voltage signal into the static coordinate system of the motor;
[0059] Specifically, the rotating high-frequency voltage signal
[0060] Among them, V sh is the amplitude of the rotating high-frequency voltage signal, ω h is the electrical angular velocity of the rotating high...
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The invention provides an identification method and apparatus for a static state initial position of a permanent magnet synchronous motor. The identification method comprises the steps of injecting a rotary high-frequency voltage signal firstly to obtain a high-frequency injection position estimation value; then performing closed-loop regulation to change the magnitude of a direct-axis fundamental frequency current; determining polarity according to an amplitude changing condition of a direct-axis component; and finally obtaining the initial position value of the rotor. After the rotary high-frequency voltage signal is injected, injection of a pulse signal is not required, so that the problem of long detection time is avoided; in addition, by adoption of the identification method for the static state initial position of the permanent magnet synchronous motor, the motor saturation characteristic is improved by changing the magnitude of the direct-axis fundamental frequency current, so that polarity misjudgement is avoided.
Description
technical field [0001] The invention relates to the technical field of motor control, in particular to a method and device for identifying an initial position of a rotor of a permanent magnet synchronous motor in a stationary state. Background technique [0002] In order to realize the high-precision and high-performance vector control of the permanent magnet synchronous motor (PMSM) drive system of electric vehicles, the position of the rotor must be accurately obtained. A resolver is usually installed to detect the rotor position, but there is an angular deviation between the zero point of the motor stator and the zero point of the resolver stator, which is unknown and random. If the angle deviation is ignored, it may cause the motor to fail to start; if the initial position of the rotor is not detected accurately, the control performance will be reduced and the torque output will be affected. [0003] Therefore, the prior art generally adopts a PMSM rotor initial positio...
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IPC IPC(8): H02P21/32H02P21/18
CPCH02P2203/03H02P2203/09
Inventor 李浩源张兴杨淑英
Owner 合肥阳光电动力科技有限公司