Design, Dynamic Electromagnetic Analysis, FEM, and Fabrication of a New Switched-Reluctance Motor With Hybrid Motion

A new structure for a hybrid motion switched-reluctance motor (SRM) is presented in this paper. The hybrid motion originated from the ability of the motor to operate in three modes: 1) rotary; 2) linear; and 3) rotary-linear, which can be named a new rotary-linear SRM. The design is in such a way that both rotary and linear motions can be controlled independently. The motor is composed of a three-phase 6/4 rotary SRM with Clockwise-Counterclockwise motions and a two-phase transverse flux linear SRM with forward-backward movements. The hybrid motion control does not need any decoupling control algorithm, which is an important issue in the other rotary-linear motors. In addition, a sensorless method for the motor control is provided. The motor design is performed based on the analytical approach. According to the obtained parameters, the motor 3-D model is utilized for electromagnetic assessment. The dynamic 3-D finite-element analysis is used to evaluate motor's flux linkage, torque, speed, current, torque ripple, torque/speed, and force characteristics. The optimum operation is considered with choosing the proper dwell angle. To verify the design, a prototype is constructed in the laboratory and compared with other structures to show the performance and applicability of the proposed motor.