Switched reluctance motor and its control method

Abstract

The invention relates to a switched reluctance motor and a control method thereof, and relates to the technical field of motors. According to the main technical scheme, the switched reluctance motor comprises a motor, a control module, an output module and a detection module; the two ends of the output module are connected with the control module and the motor respectively, and the output module is used for outputting a control signal to the motor; the detection module comprises a rotary transformer and a signal processing circuit; the rotary transformer is arranged in the motor; the signal processing circuit is connected between the rotary transformer and the control module; the rotary transformer is used for detecting angular position information and a rotating speed of a rotor of the motor to obtain an angular position information signal and a rotating speed signal, and transmitting the angular position information signal and the rotating speed signal to the signal processing circuit; and the signal processing circuit is used for processing the angular position information signal and the rotating speed signal and then transmitting the processed angular position information signal and rotating speed signal to the control module. According to the switched reluctance motor, the angular position of the rotor can be accurately read, and the rotating speed and the phase output ofthe motor can be accurately controlled.

Description

technical field [0001] The invention relates to the technical field of motors, in particular to a switched reluctance motor and a control method thereof. Background technique [0002] With the development of power electronics technology and control technology, the speed control technology of switched reluctance motor has developed rapidly. The control of switched reluctance motor needs to obtain the rotor position. Because the sensorless technology is not mature and its performance is not high, the existing In technology, switched reluctance motor products are mainly products with position sensors, and most of them are photoelectric switch (Hall switch) type position sensors. The principle is to set several different position sensors according to the phase number of switched reluctance motors. In order to obtain the position of the rotor relative to the stator, the phase output and speed measurement are controlled according to the signal of the sensor. [0003] However, whe...

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Problems solved by technology

[0003] However, when the photoelectric switch sensor is used as the sensor of angular velocity and rotor angular position, the resolution of the obtained angular position information is low and the speed response is slow. When rotating, due to the long signal transition cycle, the response is slow, which in turn affects the low-speed performance of the motor; and when the angular position sensor is installed on the motor, the operator needs to set the zero point, which will easily lead to large errors. This process also requires The operator has certain experience and has high technical requirements; in addition, the detection of the angular position of the rotor depends on the machining accuracy of the photoelectric sensor code disc. When the machining accuracy of the code disc is not high enough, it will affect the accuracy of speed calculation and motor angle control. It is easy to cause unbalanced current of each phase during motor control, motor vibration and noise, and the power device of the controller is easily damaged

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