| Summary: | In order to improve the reliability of the electrical machine, a dual-redundancy brushless DC motor is designed. two kinds of stator structure are designed, including one slot and two slots. The mathematical model of the motor is set up and the winding inductance is analyzed and calculated. The relationship between the winding inductance and mutual inductance is deduced. The magnetic potential of the motor is analyzed. Results and their analysis show preliminarily that: (1) the reduced magnetic potential is equal to the increased magnetic potential with same axes; (2) the reduced magnetic potential is larger than the increased magnetic potential with different axes. According to the mathematical model, the parameters of the motor are designed, and the rotational speed and torque are simulated. The motor is tested on the MAGTROL testing system. Mechanical characteristic curves of both kinds of stator structure under different working modes are compared. Both the simulation and the experiment results show that: (1) the motor of each kind can achieve good dynamic characteristics, and the torque is increased by 100% with two sets of windings; (2) two sets of winding did not affect motor performance, but it did indeed greatly improve the system reliability.
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