Switched reluctance motor rotation speed feedback method based on inductance interval classification
A technology of switched reluctance motor and speed feedback, which is applied in the direction of AC motor control, electrical components, electronic commutators, etc. It can solve the problems of inability to provide speed feedback accurately, achieve the effect of reducing torque ripple and improving accuracy
Active Publication Date: 2018-12-07
DALIAN UNIV OF TECH
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Problems solved by technology
[0004] In order to overcome the defects of the prior art, the present invention aims at the problem that the existing speed calculation method based on the position sensor cannot accurately provide the speed feedback, and provides a method for calculating the feedback speed by dividing the inductance interval into partitions, which can combine the low inductance area and the inductance The rotational speed in the ascending zone is fed back to the switched reluctance motor speed control system respectively to improve the speed feedback accuracy and reduce the torque ripple to a certain extent
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[0024] The specific implementation manners of the present invention will be further described below in conjunction with the accompanying drawings and technical solutions.
[0025] figure 1 It is a block diagram of a three-phase switched reluctance motor speed control system. Taking the three-phase switched reluctance motor speed control system as an example, the switched reluctance motor speed control system consists of digital signal processor DSP1-1, switched reluctance motor 1-2, power converter 1-3, 1-4PWM drive unit , current detection unit 1-5 and position detection unit 1-6 consists of six parts.
[0026] u s It is the main circuit DC power supply; A, B, C are the three-phase stator windings of the switched reluctance motor 1-2 respectively; VD1, VD2, VD3, VD4, VD5, VD6 are diodes, V1, V2, V3, V4, V5 , V6 is a switching element, the A winding is connected in series between V1 and V6, the B winding is connected in series between V3 and V4, and the C winding is connect...
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The invention belongs to the technical field of detection of the rotation speed of a switched reluctance motor, and relates to a switched reluctance motor rotation speed feedback method based on inductance interval classification. The method includes: loading a rotation speed feedback calculation program in a digital signal processor DSP; using a position detection unit to feeds back an inductanceinterval where a rotor is located in real time as a power-on logic of the switched reluctance motor; and using the digital signal processor DSP to calculate the rotation speed according to the type of the inductance interval and feeds the rotation speed back to a switched reluctance motor speed control system. Compared with the conventional rotation speed feedback method, the method for performing classification calculation on the inductance interval can replace the conventional methods for calculating the average value of the rotation speeds in the entire inductor cycle, and the feedback precision of the rotation speed is improved. Since the torque drop in the commutation of the switched reluctance motor occurs in a low inductance region, the speed feedback obtained by the method can reflect the rotation speed in a torque drop region, and torque ripple can be reduced to some extent by using an appropriate control method.
Description
technical field [0001] The invention belongs to the technical field of speed detection of switched reluctance motors, and relates to a speed feedback method of switched reluctance motors based on inductance interval classification. Background technique [0002] The switched reluctance motor speed control system generally obtains the phase winding current and the rotor position signal through the current detector and the position detector, and the speed signal is calculated by the microcontroller according to the position signal, which is called a digital speed measurement method. Photoelectric position detectors are widely used now. For example, three-phase switched reluctance motors only need three position detectors to obtain the real-time position of the rotor through digital processing of the microcontroller. The speed signal is obtained by detecting the jump edge of the shading disc through the position detector to trigger the capture module of the microcontroller, and ...
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IPC IPC(8): H02P25/08H02P25/098H02P6/17
CPCH02P6/17H02P25/0805H02P25/098
Inventor 孙建忠庞瀚文白凤仙
Owner DALIAN UNIV OF TECH