Abstract
This paper proposes a 18/15/6 pole dual-stator bearingless switched reluctance motor (DSBSRM) with better overall performance. The proposed motor separates the torque control system and the suspension control system with a magnetic isolation ring. The torque drive system adopts the method of optimizing the distribution and quantity of the stator and rotor tooth poles, which reduces the hysteresis force that exists during the commutation of the electromagnetic poles and improves the torque output capacity and the electromagnetic conversion efficiency. The suspension control system adopts hybrid excitation differential control method. This method increases the electromagnetic induction intensity of the suspension system at a small current and thus improves the levitation force output capability and control accuracy. The mathematical model of the 18/15/6 pole DSBSRM was established. The torque mathematical model adopts the Maxwell stress integral method after path optimization, and the levitation mathematical model is established with full consideration of the rotor offset problem to ensure the accuracy of the mathematical model. Ansoft Maxwell 2D software was then used to simulate the 18/15/6 pole DSBSRM in 2D. While verifying the correctness of the mathematical model, the characteristics of the motor were analyzed and the influence of key parameters such as control current and air gap thickness on the performance of the motor was analyzed. In order to further highlight the excellent performance of 18/15/6-pole DSBSRM. Compare 18/15/6 pole DSBSRM with new 16-phase BSRM and 12/8/4 pole DSBSRM. Structural decoupling method is used in all 3 motors. The results show that the proposed 18/15/6-pole DSBSRM has better performance in terms of torque and suspension output capacity and decoupling performance.
Highlights
With the development of magnetic bearing technology, applying magnetic levitation technology to switched reluctance motors(SRM), bearingless switched reluctance motors(BSRM) are produced[1]–[4]
Motor structure This paper proposes a new type of BSRM, as shown in Fig.1(a)(b) .The stator section consists of an 18-pole outer stator, a 6-pole inner stator, a stator torque winding, a permanent magnet and a levitation control winding, where the inner stator consists of a 3-phase winding control pole and a 3-phase permanent magnet control pole; the rotor section consists of a 15-pole torque rotor and a levitation rotor ring connected by a magnetic isolation material to form a whole
By optimizing the distribution and number of stator and rotor tooth poles, the hysteresis force existing during the commutation of the electromagnetic poles is effectively reduced, and the electromagnetic conversion efficiency is significantly improved
Summary
With the development of magnetic bearing technology, applying magnetic levitation technology to switched reluctance motors(SRM), bearingless switched reluctance motors(BSRM) are produced[1]–[4]. Structural decoupling eliminates and reduces the coupling of torque and levitation force by improving the motor structure, which reduces the control difficulty and ensures the reliability of the BSRM. For the winding of the motor, as shown in Fig., the torque winding on the outer stator is divided according to the structure of the 18 outer stator teeth into 3 phases separated by 40°. The levitation forces produced by 3 pairs of poles in the same phase counteract each other, which reduces the influence of torque system on suspension system.
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