Abstract
In order to solve the problem that the vehicle flywheel battery is easy to be disturbed in the process of using, a novel radial-anti-disturbance bearingless switched reluctance motor (RADBSRM) is proposed and studied based on the double stator switched reluctance motor. By widening the width of rotor poles, the flat top regions of all main winding inductances for each phase are constructed. By adopting the two-phase-conducting decoupling control rules, the electromagnetic torque and the main levitation force can be provided simultaneously. The auxiliary windings and the permanent magnet comprised in the inner stator can provide auxiliary radial suspension force, which can increase the radial load capacity, and also reduce the power consumption for suspension. The basic topology, operation principle, control method, and electromagnetic characteristics were all analyzed. Compared with double stator bearingless switched reluctance motor (DSBSRM), the results of finite element analysis method (FEM) verified that the capacity and stability of radial suspension force are both improved.
Highlights
Flywheel energy storage system is a kind of mechanical battery, which uses the high-speed rotation of flywheel to store energy
Taking the x direction as an example, the expected radial suspension force to be obtained by the rotor is defined as Fx* ; The expected suspension force to be provided by the main windings in suspension area is recorded as Fm*x ; The expected auxiliary suspension force to be co-provided by the auxiliary windings and the permanent magnet is recorded as
For the suspension force in y-direction, the radial suspension force expected to be obtained by the rotor is defined as Fy* ; The suspension force expected to be provided by the main windings in suspension area is defined as Fm*y ; The auxiliary suspension force expected to be co-provided by the auxiliary windings and the permanent magnet is defined as
Summary
Flywheel energy storage system is a kind of mechanical battery, which uses the high-speed rotation of flywheel to store energy. The annular lamination part enhanced the radial load capacity of the hybrid rotor at the noncoincidence position of stator and rotor poles, but made the complexity of magnetic field topology increased, and there still existed a large coupling between torque and suspension force. Based on DSBSRM, a permanent magnet was embedded into the inner stator along the axial direction to provide the bias magnetic field required by the radial suspension force to reduce the levitation power consumption, but the structural complexity and processing difficulty of the motor increased [21]. Based on DSBSRM, a new radial-anti-disturbance bearingless switched reluctance motor (RADBSRM) is proposed and studied in this paper, which can overcome the coupling between electromagnetic torque and suspension force, enhance the radial load capacity and anti-disturbance. It has prominent application advantages in vehicle flywheel battery and other occasions that are disturbed by road conditions and vehicle speed changes
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