A Method for Initial Position Estimation of Three-phase Electric Excited Doubly Salient Pole Motor Based on Coordinate Transformation of Series Inductance
A doubly salient motor and initial position technology, applied in the direction of electronically commutated motor control, motor generator control, control generator, etc., can solve the problems of poor portability and inability to accurately obtain the rotor angle
Inactive Publication Date: 2016-08-17
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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[0012] On the basis of the traditional pulse injection method, the present invention proposes a novel three-phase electric excitation double salient motor initial position estimation method based on the series inductance coordinate transformation method in combination with the inductance characteristics of the electrically excited double salient motor. The problem to be solved is: to overcome the shortcomings of the traditional positionless method of various initial position judgments that cannot accurately obtain the specific angle of the rotor and poor portability, and obtain a simple and easy-to-implement position sensorless control strategy for each of the electrically excited double salient pole motors. lays the foundation for reliable starting of this advanced angle
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[0031] The invention accurately detects the mechanical angle of the initial rotor position of the electric excitation double salient pole motor through the approximate sinusoidal waveform transformed by the phase inductance combination vector, so as to ensure the realization of starting control strategies for various optimized angles.
[0032] Below in conjunction with accompanying drawing, technical scheme of the invention is described in detail:
[0033] figure 1 It is a flow chart of the initial position estimation method of three-phase electric excitation doubly salient pole motor based on inductance combined coordinate transformation. It is mainly divided into seven steps:
[0034]1. Use the finite element software to establish an accurate three-phase electric excitation doubly salient motor model for simulation or through the actual motor experiment measurement, without adding excitation current, get the data waveform of the sum of the three-phase armature windings conn...
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The invention discloses a method for estimating the initial position of a three-phase electrically excited double salient pole motor without a position sensor based on series inductance coordinate transformation. Through simulation or experiment, the self-inductance waveform of two series-connected armature windings of the motor is measured, and the symmetry of the waveform is used to carry out the coordinate transformation and vector operation of the anticlockwise α electrical angle in the three-phase X-Y-Z coordinate system to obtain an approximation Based on the sinusoidal pairwise series inductance waveform and obtain the rotor position information. This method overcomes the disadvantages of the traditional positionless method of various initial position judgments that cannot accurately obtain the specific angle of the rotor, and the algorithm is complex, etc., and obtains a simple and easy-to-implement position sensorless control strategy, which is a flexible change of the advance angle for electrically excited double salient motors. Reliable starting lays the foundation.
Description
technical field [0001] The invention relates to a position sensorless control method for an electric excitation double salient motor, belonging to the technical field of electric excitation double salient motor control. Background technique [0002] As a novel motor control technology, position sensorless technology is widely used in the research of aerospace, industrial information and other fields. It can improve the integration of the motor system, enhance the adaptability, anti-interference and reliability of the system, and lay a foundation for the application of the motor in the occasions where the position sensor is easily disturbed by high temperature and strong magnetic field. In the starting stage, when the motor is controlled without position, the detection accuracy of the initial rotor position directly determines whether the motor can start normally and run smoothly. [0003] Electric excitation double salient pole motor combines the advantages of permanent mag...
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IPC IPC(8): H02P21/18
Inventor 赵耀王慧贞刘伟峰王永杰邹云飞
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS