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Surface-mount permanent magnet synchronous motor rotor initial position detection method

A permanent magnet synchronous motor and rotor initial position technology, which is applied in the control of generators, motor generators, electromechanical transmissions, etc., can solve the problem of judging the positive direction of the d-axis during the duration of voltage pulses, and the requirements for current detection accuracy are relatively high , spend a certain amount of time and other issues, to achieve the effect of shortening the estimation time, avoiding the vibration problem of small inertia motors, and reducing the accuracy of current detection

Active Publication Date: 2014-08-13
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

The above-mentioned methods based on high-frequency signal injection all divide the estimation process into two stages: initial position estimation and d-axis positive direction judgment. During the d-axis positive direction judgment process, positive and negative voltage pulses with equal amplitudes need to be injected on the d-axis. Use the difference of current response to judge the positive direction of d-axis. This kind of method has relatively high requirements on the accuracy of current detection, and the estimation process takes a certain amount of time. misjudgment of direction

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  • Surface-mount permanent magnet synchronous motor rotor initial position detection method
  • Surface-mount permanent magnet synchronous motor rotor initial position detection method
  • Surface-mount permanent magnet synchronous motor rotor initial position detection method

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[0026] Such as figure 1 As shown, the present invention provides a method for detecting the initial position of the rotor of a surface-mounted permanent magnet synchronous motor, which specifically includes the following steps:

[0027] 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 position estimate, The initial value of is 0;

[0028] Step 2. After estimating the synchronous rotation of the rotor The d-axis of the coordinate system injects a high-frequency cosine voltage q-axis given voltage signal, Among them, U hm is the amplitude of the high-frequency voltage injected on the d-axis, and t represents the current moment;

[0029] Step 3....

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Abstract

The invention discloses a surface-mount permanent magnet synchronous motor rotor initial position detection method. The method includes the steps that a high-frequency voltage injection method is adopted for achieving d-axis positive direction judging by extracting d-axis positive direction information included in double injection signal frequency subharmonic in d-axis current responses on the basis of achieving the estimation of an initial position. According to the method, the action of injecting positive and negative pulses additionally and then comparing values of amplitude of the current response is not needed, estimation time is shortened, the estimation process is simplified, the requirement for the precision of current detection is lowered, in addition, tender moving of a rotor can be avoided, and application occasions are broadened.

Description

technical field [0001] The invention belongs to the field of motor control, in particular to a method for detecting the initial position of a surface-mounted permanent magnet synchronous motor rotor. Background technique [0002] At present, for the initial position detection method of the rotor of the permanent magnet synchronous motor, the common di / dt type and the signal injection type are mainly used. [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 position of the rotor, and quickly estimate the initial position of the rotor through 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; [0004] Jia Hongping, He Yikang. Research on initial po...

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Application Information

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IPC IPC(8): H02P21/14
Inventor 刘兵周波刘海东李洁王龙
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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