Design and Analysis of a Linear-Rotary Fault-Tolerant Consequent-Pole PM Actuator

Abstract

Linear-rotary permanent magnet (PM) actuator is a type of multi degree of freedom actuators, which can be widely applied in many fields such as car driving, drilling process. This paper proposes a novel linear-rotary fault-tolerant consequent-pole (CP) PM actuator for an integrated electromagnetic suspension and steering system. The key of the proposed actuator is the special stator and CP rotor. Combined the alternating arrangement structure of armature teeth and fault-tolerant teeth, two sets of orthogonal fractional-slot concentrated-windings embedded in the adjacent slot of armature teeth are employed to achieve linear and rotary motion and their decoupling control, and enhance fault-tolerant capability. By employing CP and flux-modulation structures, not only the airgap flux density can be enhanced along circumferential direction but also higher torque performance with lower PM consumption can be achieved. The relevant electromagnetic performance is predicted by using the finite-element method.