Switched Reluctance Motor Radial Force Control and its Applications

• Main Authors: Feng-Chieh Lin, 林逢傑
• Other Authors: Sheng-Ming Yang
• Format: Others
• Language: en_US
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/04919809927021281652

博士 === 淡江大學 === 機械與機電工程學系博士班 === 94 === The main objective of this research investigates the control of radial force of 12/8-pole SRM, and the applications of this scheme to motor vibration reduction and self-bearing control. The mathematical models of the motor were analyzed and developed through finite-element analysis. The attraction force between the stator and rotor pole teeth and its orientation was modeled as a function of the rotor angle and the excitation current. Mutual inductance was included in the modeling. The attraction force is decomposed into motor torque and radial force, and consequently, the torque and radial force produced by the motor is analyzed. Three radial force control schemes were investigated in this research. In the beginning, single-phase sinusoidal currents with phase shift was proposed to control the SRM. Then, a two-phase sinusoidal excitation scheme was presented to extend the force producing capability of the single-phase scheme. In addition, a six-pole excitation scheme for radial fore control was also investigated. All of these schemes have been verified to be able to produce radial force and torque effectively, and independently. The single-phase sinusoidal current scheme has been applied to show that motor vibration can be reduced by appropriate radial force control. The two-phase sinusoidal excitation scheme has been applied to realize self-bearing control of the SRM. In this one-axis self-bearing motor, the rotor needs only one bearing for rotation and constrain of axial movement; the other end can move freely in radial direction and is balanced at the center of the air gap with the radial force produced by the motor.