Segmented PWM duty ratio control method for switched reluctance motor
A technology of switched reluctance motor and control method, applied in the direction of AC motor control, control system, electrical components, etc., can solve the problems of poor motor output performance, fast current change, slow current change, etc., to reduce torque ripple, The effect of improving tracking performance
Active Publication Date: 2018-08-21
HEFEI UNIV OF TECH
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Problems solved by technology
[0008] 1) The duty cycle cannot be flexibly changed in the phase conduction interval
The inductance of the first half of the conduction interval of the switched reluctance motor is relatively small, and the current changes quickly, while the inductance of the second half of the conduction interval is relatively large, and the current changes slowly. The output performance is relatively poor
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[0035] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0036] The example of the present invention provides a segmented PWM duty cycle control method for switched reluctance motors, which overcomes the disadvantage of large current ripples under traditional current soft chopping control, improves the current tracking performance of switched reluctance motors, and further reduces the switching magnetism. Prevent motor torque ripple.
[0037] figure 1 One control scheme for implementing the invention is shown. see figure 1 , implement the basic steps of a kind of switched reluctance motor subsection PWM duty ratio control method proposed by the present invention as follows:
[0038] Step 1, Segmentation of the conduction interval of the switched reluctance motor
[0039] Suppose m is the number of motor phases, m≥3,...
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The main factors affecting the running characteristics of a switched reluctance motor are current waveform, current peak and peak position, and thus precise control over current is the key to improving the running performance of the switched reluctance motor. Chopped current control is generally adopted for the switched reluctance motor at a base speed, but in practical application, due to the nonlinearity of inductance and the limitation of sampling frequency in a digital control system, single chopped current control cannot achieve a good current tracking effect. The invention discloses a segmented PWM duty ratio control method for the switched reluctance motor. The method can overcome the defect of large current ripple under traditional soft chopped current control and improve the current tracking performance of the switched reluctance motor, thereby reducing the torque ripple of the switched resistance motor.
Description
technical field [0001] The invention belongs to the control technology of switched reluctance motors in the field of electrical engineering, and in particular relates to a segmental PWM duty ratio control method of switched reluctance motors. technical background [0002] The switched reluctance motor (Switched Reluctance Motor, SRM) has a simple structure, a wide speed range and high efficiency, which is very in line with the requirements of lightweight and cost-effective electric vehicles. Each phase of the SRM is independent of each other, so it has strong fault tolerance and good security. It also has the advantages of many controllable parameters and flexible control methods. The above characteristics are very suitable for the application requirements of the current electric drive system of new energy electric vehicles, so it has attracted extensive attention from academia and industry. However, due to the unique doubly salient pole structure of SRM, it is a nonlinear,...
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Inventor 马铭遥杨晴晴袁克湘张兴杨淑英
Owner HEFEI UNIV OF TECH