Position sensorless control method and system for switched reluctance motor
A technology of switched reluctance motor and control method, which is applied in the direction of control system, AC motor control, electrical components, etc., which can solve the problems of limited speed range, filter position detection error, phase lag, etc., achieve low cost and improve position detection accuracy , The effect of expanding the speed range
Active Publication Date: 2018-07-06
GUANGZHOU ZHIGUANG ELECTRIC CO LTD +1
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Problems solved by technology
However, the existing current gradient method determines the peak value of the phase current by detecting the zero-crossing point of the derivative of the phase current. Before calculating the derivative of the current, the current must be filtered, and the real-time filtering operation will inevitably lead to a phase lag. The information is delayed, forming an error, and the higher the speed, the greater the error
The position detection error obviously affects the control performance of the motor, and at the same time severely limits the applicable speed range of this method
Therefore, it is necessary to solve the problem of position detection error generated by filtering
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[0030] The content of the present invention will be further described in detail below in conjunction with preferred embodiments and accompanying drawings. Apparently, the embodiments described below are only used to explain the present invention, not to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention. It should be understood that although the terms "first", "second", etc. are used hereinafter to describe various information, these information should not be limited to these terms, and these terms are only used to distinguish information of the same type from each other. For example, "first" information may also be referred to as "second" information without departing from the scope of the present invention, and similarly, "second" information may also be referred to as "first" information. ...
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The invention relates to a method and a system for position sensorless control of a switched reluctance motor. The method comprises the following steps: obtaining the phase current signal of a switched reluctance motor winding in a previous cycle; carrying out low-pass filtering and anticausal filtering on the phase current signal at the turn-off moment of the winding respectively so as to obtain first current shape information and second current shape information respectively; determining a first moment when the peak value of the first current shape information appears and a second moment when the peak value of the second current shape information appears; calculating the rotating speed of the switched reluctance motor; obtaining phase difference caused by real-time filtering according to the first moment, the second moment and the rotating speed; and compensating according to the position information of the phase difference for a rotor to obtain the real-time position information of the rotor so as to carry out position sensorless control. According to the method and the system, the position detection accuracy can be improved, the rotating speed range suitable for a current gradient method is enlarged, the hardware cost does not need to be added, and the method is a general, low-cost and practical technology for position sensorless control of the switched reluctance motor.
Description
technical field [0001] The invention relates to the field of switched reluctance motor control, in particular to a position sensorless control method and system for a switched reluctance motor. Background technique [0002] The switched reluctance motor has the advantages of simple structure, firmness, high efficiency, and low cost. It is a motor that has attracted wide attention and has a good development prospect. During normal operation of the switched reluctance motor, real-time rotor position information is needed for commutation and continuous torque generation. At present, photoelectric, electromagnetic, Hall sensors or shaft encoders are generally used to detect the rotor position. Reliance on position sensors increases system cost, reduces system reliability, increases system volume, limits application range, and greatly weakens the advantage that switched reluctance motors are more suitable for working in harsh environments than other motors. In order to overcome...
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IPC IPC(8): H02P25/089
CPCH02P25/089
Inventor 曾辉姜新宇许贤昶
Owner GUANGZHOU ZHIGUANG ELECTRIC CO LTD