Abstract
In order to overcome the disadvantages of 12/8 pole bearingless switched reluctance motors (BSRMs), such as high commutation frequency, more stator windings, and more power devices, a 6/4 pole BSRM with half the commutation frequency and number of windings is studied. The structure characteristics and operation characteristics of the 6/4 pole BSRM are investigated through modeling, simulation, and prototype experiment, and the main performance indices, such as suspension force, inductance performance, and air-gap flux density, are evaluated to reveal the levitation control mechanism of the 6/4 pole BSRM with permanent magnets in its stator yoke. The motor can suspend stably in the radial direction, and the correctness and feasibility of the theoretical analysis are verified.
Highlights
In switched reluctance motors (SRMs), rotors and stators are salient pole structures
In order to further improve system integration and rotor critical speed, the magnetic bearing stator winding is replaced by adding a suit of windings on the stator pole, and the winding current is controlled to achieve the active suspension of the rotor, forming a bearingless motor
In a stator permanent magnet bearingless motor, the rotor is a simple structure, formed from high-strength, cheap silicon-steel sheets,3 with the permanent magnet situated in the stator, where it is subject to low mechanical stress, favorable cooling conditions, and a low risk of demagnetization
Summary
In switched reluctance motors (SRMs), rotors and stators are salient pole structures. In order to further improve system integration and rotor critical speed, the magnetic bearing stator winding is replaced by adding a suit of windings on the stator pole, and the winding current is controlled to achieve the active suspension of the rotor, forming a bearingless motor. For further reducing the consumption of suspension power and improving the output capacity of the suspension system, a BSRM with permanent magnets in its stator yoke is proposed, with a doubly salient structure. The structural and operational characteristics of a 6/4 pole BSRM are considered and key performance indices pertaining to its levitation force, inductance performance, and air-gap flux density are used to analyze the levitation control mechanism of the 6/4 pole BSRM with permanent magnets in its stator yoke. The results verify that the new motor retains its efficacy in terms of control of the levitation force when using fewer permanent magnets and has a good decoupling control effect between the levitation force and torque, lending credence to the concept of efficient control over the subsequent prototype
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