Design Of Two Phase4/2Poles High Speed Switched Reluctance Motor And Acoustic Noise/Vibration Reduction

Switched reluctance motor(SRM) is a kind of typical doubly salient reluctance motors, it has the characteristics of simple structure, strong anti-interference ability, suitable for high speed running and lower cost, it has been widely used in some areas of low cost and high speed in recent years. Two phase SRM is a class of SRM with fewer phases, it is the characteristic of fewer phases that makes the two phase SRM’s structure is more simple and cost is more affordable, it is very suitable for application whose cost is relatively stringent controlled. Two phase SRM has all the advantages of SRM, however, it also has its own unique drawbacks, it can’t self-start from certain positions of the rotor, in addition, when running at high speed, the torque ripple, noise and vibration issues are prominent.In order to solve the problem that two phase SRM can’t self-start from certain positions of the rotor, this paper proposes a method to optimize motor’s rotor structure. Using a three-section graded air gap on the rotor structure to make two phase SRM’s torque can be output effectively in a more wide range of the rotor, so as to eliminate two phase SRM’s torque dead zone, make the motor self-start in any position of the rotor, in addition, Using a three-section graded air gap can also help to reduce motor’s torque ripple.In order to make the two phase SRM play an important role in the field of low-cost applications, a novel power converter for switched reluctance motor with single power switch per phase and dual power supply is proposed, the novel power converter can be used to reduce the cost of the drive system, moreover, the use of dual power supply is also conducive to dynamically adjust motor’s freewheeling voltage, increase motor’s conduction angle and improve the power density.In order to reduce two phase SRM’s vibration and noise when running at high speed, a method of stator and rotor poles are skewed with a same angle simultaneously is presented in this paper, by adopting the method, the stator can be made suffered a more uniform distribution of the radial force, thereby to reduce the vibration and noise of the motor.A software and hardware integrated platform is constructed for two phase SRM according to the above proposed methods, the feasibility and practicality of the above methods are verified by simulated and experimental results.