Calculation and optimization of a permanent magnetic hybrid driven 3-DOF motor

Abstract

In this paper, a new type of permanent magnet type 3-DOF hybrid driven motor is proposed in view of the poor precision of existing deflection movement control and low speed of multi-degree-of-freedom motor rotation. The motor contains two part named lateral rotation module and internal deflection modules. The output torque of the motor, the rotation speed and control precision are improved by the coordinated control of rotation movement and deflection movement. The magnetic field shielding and optimization of two modules inside and outside the motor are realized by using Halbach permanent magnet array, and the magnetic field characteristics of the motor are improved. First, using analytical method and finite element method, the magnetic field characteristics and distribution of the permanent magnet of the motor are analyzed, and the electromagnetic characteristics of load and no load condition and output torque of the motor is analyzed by finite element method. Then, the loss of this motor is analyzed and calculated, the motor response surface equation is built by using taguchi method and central composite design method. Finally, the optimal structure parameters of motor is proposed by the numerical model based on maximizing the motor output torque of the target, and it is compared with finite element and experiment to verify the accuracy of the structural parameters. It provides a new theoretical basis for the follow-up optimization of the motor.