A Control Method of Block Linear Switched Reluctance Motor Based on Coupling Voltage
A technology of switched reluctance motor and coupling voltage, which is applied in the field of electric power transmission, can solve the problems that the pulse response current amplitude cannot be too small, reduce the average output of the motor, limit the speed range of the method, etc., and achieve detection accuracy and negative torque , The effect of improving the speed application range and offsetting the influence of back electromotive force
Active Publication Date: 2021-03-05
YANGZHOU UNIV
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Problems solved by technology
[0003] The main disadvantages of the existing pulse injection methods are: the back electromotive force of the motor is ignored, and the accuracy of motor position estimation is greatly reduced when the motor speed increases, which limits the applicable speed range of the method; Phase current and the pulse response current when the phase is used as an idle phase, the amplitude of the pulse response current should not be too small in terms of detection accuracy
The idle phases are all in the inductance drop zone, and the pulse response current of a certain amplitude will cause the negative torque / electromagnetic thrust of the motor, thereby reducing the average output of the motor; The waveform of the pulse response current detected when the frequency pulse voltage is affected by the eddy current will cause waveform distortion, and the information such as its peak value and slope will change, which will directly affect the accuracy of the indirect detection of the position.
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[0034] The present invention will be further described below in conjunction with specific embodiments.
[0035] The DLSRM studied in the present invention is a bilateral structure, such as figure 1 shown. Each phase winding of the motor consists of two sets of symmetrical coils connected in series or parallel. In order to reduce the unbalanced force and vibration of the motor, the coils in each phase winding are mostly composed of parallel structures.
[0036]The selection method of the position feature quantity proposed in the present invention is as follows: first, inject pulse voltage into one of the coils in the idle phase of the motor (this coil is called the injection coil), and the position feature quantity is the other coil (the coil is called the detection coil) Coupling-induced voltage across the terminal. In the following, the validity of the characteristic quantity is analyzed by using the magnetic circuit.
[0037] figure 2 The magnetic flux distribution an...
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The invention discloses a coupling voltage-based block-type linear switched reluctance motor control method in the field of electric transmission, which includes the following steps: step 1) selecting position feature quantities; step 2) based on the position detection feature quantities, designing The main circuit topology of the position sensorless control system; step 3) select the LSRM starting and injection pulse phase; step 4) after starting, control the linear switched reluctance motor without position sensor system; the invention offsets the influence of the back electromotive force during the operation of the motor, The speed application range of the method is improved and can be used in rail traffic.
Description
technical field [0001] The invention relates to a motor structure and a method for indirect detection of the position of the motor, in particular to a structure and a method for indirect detection of the position of a double-sided linear switched reluctance motor applied to rail transit, and belongs to the field of electric transmission. Background technique [0002] At present, the research on the position sensorless control method of bilateral switched reluctance linear motor (DLSRM) mainly refers to the existing position sensorless control method of rotary switched reluctance motor (SRM). In the case of SRM starting and low-to-medium speed operation, the high-frequency pulse injection method is the most commonly used position sensorless control method. In the high-frequency pulse injection method, high-frequency pulses are generally injected into the idle phase, and the unsaturated inductance value of the motor, the relative position of the SRM unsaturated inductance and ...
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IPC IPC(8): H02P25/064H02P25/089
CPCH02P25/064H02P25/089
Inventor 王千龙蒋伟吴正飞于照蒋步军
Owner YANGZHOU UNIV