Permanent magnet assisted synchronous reluctance motor in hoist application

A permanent magnet assisted synchronous reluctance (PMASR) motor is designed and tested for a wire rope hoist for which the load and speed requirements vary greatly especially in workshop usage. The new hoisting motor is compared with the state-of-art cage-induction motor. The advantages of PMASR motor in hoist application are a high torque at low speeds, wide speed range, reasonable back EMF, and high torque/current ratio. Different rotor geometries are designed and the performance is analyzed using time-discretized numerical analysis. The main design criterion is minimizing the amount of permanent-magnet material. The experimental results verify that the PMASR motor is suitable for hoisting applications.