A sensorless control device and control method for a switched reluctance motor
A switched reluctance motor and control device technology, applied in the direction of single motor speed/torque control, electronic commutator, etc., can solve the problems of reduced detection accuracy of current gradient, zero-crossing change of current gradient, small current change, etc. , to achieve the effect of large number of pulses, simple implementation and cost saving
Active Publication Date: 2017-04-12
河北兆科世勃智能科技有限公司
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[0004] However, the current gradient detection method has the following disadvantages: it is necessary to build a current gradient detection circuit; when the motor is running at low speed, the current gradient detection accuracy is reduced due to the small current change per unit time, making it impossible to apply at low speeds; in addition, This method has poor fault tolerance, which is reflected in the zero-crossing change of the current gradient when the current is disturbed and the current glitch occurs, and the wrong detection position is obtained.
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[0046] The present invention will be further described below in conjunction with accompanying drawing:
[0047] Such as figure 1 In the structural schematic diagram of the control device of the present invention shown in the present invention, a switch reluctance motor sensorless control device of the present invention, the control device includes a power converter 1, a current detection interface circuit 2, a switched reluctance motor 3, a processor 4. The processor is respectively connected with the power converter and the current detection interface circuit, the power converter is respectively connected with the processor, the current detection interface circuit, and the switched reluctance motor, and the current detection interface circuit is respectively connected with the processor, the power converter, the A switched reluctance motor is connected.
[0048] The processor includes a pulse number calculation unit 41 at the on position, a pulse number calculation unit 42 a...
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The invention discloses a control device and method of a position-free sensor of a switched reluctance motor. The control device is composed of a processor, a power converter, a current detection interface circuit and the switched reluctance motor. When the turn-off angle is reasonably opened and the motor speed is constant, the duty ratio is adjusted to change the voltage average value on the machine winding phase so that the maximum current value appear at the position where the inductance starts to rise. Pulses with a certain frequency are put into the processor, the processor performs pulse counting for the pulses with the certain frequency and the rotating speed and position of the motor are calculated by calculating the amount of the pulses among the maximum current values of all phases. The control device and method have the advantages of being saving in cost, simple to use, strong in fault-tolerant ability and flexible to control.
Description
technical field [0001] The invention relates to the technical field of switched reluctance motor control, in particular to a position sensorless control device and control method for a switched reluctance motor. Background technique [0002] It is known that the operation of the switched reluctance motor requires the correct rotor position to operate normally, but the installation of a position encoder will increase the complexity of the entire system and reduce the robustness of the system, and the position encoder is easily affected by environmental factors and cannot be used in harsh environments. Therefore, the research on the position sensorless control device and method of switched reluctance motor is of great significance. The position sensorless technology of switched reluctance motor has been developed rapidly since its appearance. Scholars at home and abroad have given many positionless detection schemes. The current position sensorless detection methods can be rou...
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IPC IPC(8): H02P6/08H02P6/18
Inventor 李珍国王江浩王红斌
Owner 河北兆科世勃智能科技有限公司