Electromagnetic Property Analysis of a Bearingless Induction Motor Using Amorphous Alloy Material

Abstract

A bearingless induction motor (BL-IM) is a new type of motor integrating suspension and rotation functions. Higher requirements are put forward for its suspension performance. Due to the material advantages of a new type of amorphous alloy with high magnetic conductivity, low loss, and low coercivity, it is considered to be used in the BL-IM rotor to reduce iron loss and improve the electromagnetic performance of the BL-IM. Finite element analysis software is used to analyze the performance of two different kinds of motors with the rotors made of conventional silicon steel and amorphous alloy, respectively. The magnetic field density distribution, torque, speed, and radial force are compared between the two motors. The results show that the speed of amorphous alloy motor increases faster, and the rotor has better suspension characteristics. Moreover, the amorphous alloy material has a smaller density; the material properties can effectively reduce the weight of the motor; it is beneficial to the operation of the BL-IM in special environments.

Maximum Torque Output Strategy of Bearingless Induction Motor in the Field-Weakening Region

“…Compared with other motors, a bearingless induction motor (BIM) possesses the advantages of simple structure, solid and reliable, uniform air gap, low cost, and low groove pulsation torque. A new electrical transmission scheme is provided for the development of sophisticated transmission equipment, such as high-speed centrifugal pump, flywheel energy storage, and agricultural equipment [6][7][8][9][10].…”