With the development of power electronics, micro electronics technology and AC motor speed control and control technology, many DC generators have been replaced by various thyristor rectifier power supplies. DC motor and DC drive system in some areas, especially in the large field of motor was replaced by operation, maintenance of relatively convenient AC speed regulation motor and AC speed regulation system, the scope of application of a tendency to reduce. However, the DC motor and the DC drive system which can decouple the speed regulation have accumulated a great deal of experience in operation and maintenance through long-term development. AC speed motor and AC speed regulation system are considered. In a certain capacity range and some operating modes, there are still technical and economic rationality of the system, and some operating requirements and operating environment can not be separated from the DC system. Therefore, in a given period of time, the DC motor and DC drive system still have room for development, and can not or should not be fully replaced. Facing the reality of the current development trend of DC motor is: to actively adopt new technology, new structure, new materials, new technology and new problems to overcome the thyristor rectifier power supply to the motor caused by commutation, insulation, noise and vibration etc.. On this basis, in order to meet the special requirements of different machinery, improvement and development of the maintenance and inspection system, give full play to the excellent characteristics of DC motors with inherent, thyristor matched rectifier power supply system, design and manufacture for thyristor DC motor for thyristor rectifier power supply, the establishment of a new series a new DC motor.