Design And Study On A Five Phase Fault-Tolerant Vernier Motor

In recent years,with the development of direct drive technology,the use of permanent magnet motor has become increasingly widespread,and playing an important role in the traditional industry and new energy sector.Permanent magnet motors have high power density and high power factor,but generally have poor fault tolerance.When a fault occurs,it will inevitably cause economic loss and even pose a threat to personal safety.Based on the principle of flux modulation and the use of fractional slot concentrated winding and multi-phase structure,this paper studies the high power density permanent magnet cursor motor with low speed and large torque and strong fault tolerance.The working principle of the vernier motor-the principle of magnetic flux modulation is explained in detail in this paper,and the matching relationship between the number of armature pole pairs,the number of stator magnetizing teeth and the number of rotor pole pairs is explained.The fault-tolerant motor uses the power size equation of the hub-type motor and calculates the initial design parameters of the motor design according to the design requirements.The single-layer fractional slot concentrated winding and fault-tolerant teeth are used to implement the fault-tolerant design of the motor body.Simulations were performed under normal and fault conditions,and the reliability of the motor design is verified.The parameters of the five-phase rotor with double-side permanent magnet vernier fault-tolerant motor,such as the ratio of the circumferential width of the magnetized teeth of the inner and outer stators,the radial height of the magnetized teeth and the height of the permanent magnet,were optimized.In addition,the eccentric design of the stator teeth is also proposed.The finite element method is used to analyze the optimized motor.The results prove the effectiveness of the optimization.The control strategy of the open-circuit and short-circuit faults of the motor are studied,and the fault-tolerant control performance of the control strategy based on theintegrated vector method and the principle of power invariance under the open-circuit fault of the motor winding is analyzed and compared.The one-phase winding short-circuit current control strategy is also proposed,and the current under single-phase short-circuit fault conditions is calculated in detail.Co-simulation with Maxwell by building a Simplerer external circuit,which verifies the effectiveness of the proposed method.