Abstract
The 16/6/8 double-stator bearingless switched reluctance motor (DSBSRM) is used as the object of study in this paper. To solve the problem of torque and levitation force ripples in this motor, a control system direct force control (DFC) and direct instantaneous torque control (DITC) based on the torque sharing function (TSF) are proposed. With the strong nonlinearity and approximation capability of radial basis function neural networks, the torque and levitation force observer are designed. The observed torque and levitation forces are used as feedback for the internal loop control, which is combined with the external loop control to make a double closed-loop control. In order to further improve the output torque and system robustness and suppress the torque ripple in steady-state process, the motor winding method is optimized and a set of switching angles is added on the basis of TSF. The simulation results verify the effectiveness and superiority of the proposed control method. It effectively suppresses speed ripple and reduces torque and levitation force fluctuations and rotor radial displacement jitter.
Highlights
With the development of modern industry, the performance requirements of motors are becoming higher and higher.e traditional motor uses mechanical bearings, so the bearing has high mechanical wear, works less efficiently, and has a low life at high speeds
In order to overcome the disadvantages of mechanical bearing, scholars proposed the bearingless switched reluctance motor (BSRM) [1, 2]
In order to suppress torque and levitation force torque pulsation for 16/6/8 double-stator bearingless switched reluctance motor (DSBSRM) [21], this paper proposes a DTC and direct force control (DFC) control system based on RBF
Summary
With the development of modern industry, the performance requirements of motors are becoming higher and higher. In order to suppress torque and levitation force torque pulsation for 16/6/8 DSBSRM [21], this paper proposes a DTC and DFC control system based on RBF. E control winding and the permanent magnets work together to achieve the stable levitation of the motor. Erefore, the inner stator has a levitation force on the rotor in the −X direction when the M-phase winding is not energized. In order to achieve stable levitation and rotation of a bearingless motor, the relationship between torque and levitation force, rotor position angle, and winding current needs to be expressed to clarify the control laws for the phase windings. Torque and levitation forces can be controlled separately, and the levitation forces in the X and Y directions can be controlled separately
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