Motor practical design method must follow the following principles: 1. Motor design should pay attention to practical, simple, easy popularization, make the design workers for motor design is very clear, clear, and to solve the main problems in the design of motor, the motor designers the big picture in the chest, know fairly well. To adapt to different levels of the motor design workers, make general motor design and technical personnel to be able to quickly master. 2。 Motor design methods have considerable design calculation accuracy and coincidence rate, to ensure that the design of motor and produce a high coincidence rate to 3. Motor design must be low cost, to make the motor design workers have, use up, the simplicity of the design.