Most of the motors used in medical equipment are special motors or new motors, including motors which are different from general electromagnetic principles in principle, structure and operation mode. Basic functions include: mechanical position sensing and indication, signal transformation and calculation, motion speed detection and feedback, motion device driving and positioning, timing standard and small power supply, etc. Based on the requirements of its special performance, special function and special working environment, it absorbs a lot of the latest technological achievements of related disciplines, especially the application of new technologies, new materials and new processes.