Design and Analysis of High Reliability Fault Tolerant Permanent Magnet Steering Motor

In order to solve the problems of large mutual inductance between phases, magnetism and heat coupling of high and low voltage windings and low reliability for traditional steering motor, a design scheme of high reliability fault tolerant permanent magnet steering motor for automotive steering system application is proposed. The main parameters of the motor design are given. By selecting the number of pole slots, winding distribution and the design of fault-tolerant teeth, the high and low voltage windings of the motor are located in different slots. Through the physical isolation of fault-tolerant teeth, the electric, magnetic and thermal triple physical isolation of high and low voltage windings is realized. The stator adopts unequal teeth to improve the efficiency of the motor, and the rotor adopts semi embedded SPM, which has high overload capacity. The electromagnetic performance of the motor is analyzed by finite element method. The motor meets the design performance requirements, the mutual inductance between phases and high and low voltage windings of the motor is almost zero, and the motor has the advantages of strong overload capacity, high efficiency and small amplitude of electromagnetic vibration.