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Method for detecting initial position of surface PM synchronous motor

A permanent magnet synchronous motor, initial position detection technology, applied in the direction of control of generators, motor generator control, control of electromechanical transmissions, etc., can solve the problems not mentioned, to shorten the estimation time, simplify the estimation process, the initial position The effect of simplification of the detection process

Active Publication Date: 2014-09-03
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

Liu Ying, Zhou Bo, Zhao Chengliang, et al. Low-speed position sensorless control of SPMSM based on pulse-vibration high-frequency current injection[J]. Chinese Journal of Electrotechnical Society, 2012, 7(27):139-145. The first use of pulse-vibration high-frequency current injection method to realize the SPMSM rotor position estimation, but there is no mention of how to judge the positive direction of the d-axis

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  • Method for detecting initial position of surface PM synchronous motor
  • Method for detecting initial position of surface PM synchronous motor
  • Method for detecting initial position of surface PM synchronous motor

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[0041] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:

[0042] Such as figure 1 As shown, the present invention provides a method for detecting the initial position of a surface-mounted permanent magnet synchronous motor, which specifically includes the following steps:

[0043] Step 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 rotor 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 rotor initial position, is the final initial position estimate, The initial value of is 0;

[0044] Step 2), such as image 3 As shown, the q-axis current of the estimated rotor synchronous rotation coordinate system is given as 0, and the d-axis current is given as a pulse vibrati...

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Abstract

The invention discloses a method for detecting the initial position of a surface PM synchronous motor. The method for detecting the initial position of the surface PM synchronous motor comprises the steps that on the basis that the initial position is estimated for the first time according to the pulse vibration high-frequency current injection method, an injection signal period is evenly divided into four sections, integration is conducted on the d-axis high-frequency voltage response within the section I and the section III, or integration is conducted on the d-axis high-frequency voltage response within the section II and the section IV, and the positive direction of the d axis is judged according to the symbol of an integral value. According to the method for detecting the initial position of the surface PM synchronous motor, the positive direction of the d axis is judged without the need of extra injection of a positive pulse signal and a negative pulse signal, time for estimation is shortened, and the estimation process is simplified.

Description

technical field [0001] The invention relates to the field of motor control, in particular to a method for detecting the initial position of a surface-mounted permanent magnet synchronous motor. Background technique [0002] At present, for the initial position detection method of the surface-mounted permanent magnet synchronous motor rotor, the common di / dt type and signal injection type are the main methods. [0003] Yuzawa T, Tanaka K, Moriyama R, et al.An efficient estimation method of sensorless initial rotor position for surface PM synchronous motor[C] / / Electric Machines and Drives Conference,2001.IEMDC2001.IEEE International.IEEE,2001:44- 49. Use di / dt to detect the rotor position, and quickly estimate the initial position of the rotor by the half-search method, but the rotor of the motor needs to be fixed during the identification process, and the identification result is affected by the cogging effect. Liu Ying, Zhou Bo, Li Shuai, et al. Rotor initial position detec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/14
Inventor 刘兵周波李洁王龙王庆龙
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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