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| Analysis and Improvement of Levitated-Winding Power Converters of a Bearingless Switched Reluctance Motor |
| Yang Gang, Deng Zhiquan, Cao Xin, Luo Jianzhen, Fan Dong, Wang Xiaolin |
| Nanjing University of Aeronautics and Astronautics Nanjing 210016 China |
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Abstract In this paper the principle of a bearingless switched reluctance motor is briefly introduced. According to the control strategy of torque and radial force, the characteristics and disadvantages of the three-phase half-bridge power converter are explained. Then based on the small signal models of torque and radial force, the influence of current ripple on torque and radial force is analyzed. According to these analyses, the improved measure is taken that the levitated winding power converters adopt the three-phase four-leg topology and the digital hysteresis loop of current worked on tri-state control mode. Then all kinds of work states and mathematical models of power converters are expounded. The magnitude and difference between current ripples of two kinds of converters in digital hysteresis loop control mode are analyzed. The experimental results verify the effectiveness of the improved measures.
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Received: 20 April 2009
Published: 12 December 2014
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2010, Vol. 25 
