Abstract
In this paper, a built-in integrated magnetorheological (MR) fluid brake permanent magnet synchronous motor is presented, which can switch between rotation and brake operation states in a relatively simple structure by integrating the MR fluid brake inside the rotor of the PMSM. Benefiting from the different flux paths design corresponding to the armature winding in the outer stator and the braking winding in the inner stator, the proposed machine can provide adequate brake torque and improve space utilization. This paper illustrates machine topology, operation principles, and design considerations. After proceeding flux leakage reduction, magnetic pole layout optimization of the braking winding, and balance optimization between brake torque and electromagnetic torque, successively, the optimal machine is obtained. Finally, the finite element analysis is devoted to the electromagnetic performance analysis of the proposed machine, and torque capabilities between rotation and brake states are compared, verifying the feasibility of the integration design.
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