Step motor has become the third class except dc motor and ac motor motor. Traditional motor as an electromechanical energy conversion device, in the human production and life into play a key role in the process of electrification. But in today's human society into the era of automation, the function of the traditional motor can not meet all sorts of motion control system such as factory automation and office automation. To meet these requirements, development of a series of new motor system has the control function, which has its own characteristics, are widely used and category is stepping motor. The development of the stepper motor is closely related to the computer industry. Since the stepper motor in the computer peripheral equipment to replace later, small dc motor to improve the performance of the equipment, quickly promoted the development of the stepper motor. On the other hand, the development of the microcomputer and digital control technology, and will perform component as the numerical control system of step motor applied to other areas, such as electric machine, small power mechanical processing machine tools, measuring instruments, optical and medical equipment, packaging machinery, etc. Mature process, any kind of products are basically specifications varieties gradually unify and simplify the process. Now, the development of the stepper motor has come down to the reluctance of single conductor structure type, the structure of the hybrid and claw pole permanent magnet three categories. Cheap, the claw pole motor performance index is not high, the hybrid and magnetic resistance type main motor as high resolution, because the hybrid stepping motor has small control power, good running stability and gradually in a dominant position. The most typical product is two phase 8 50 gear motor, step away from the Angle of 1. 8°／0. 9°（Full/half steps)； And five phase 10 pole 50 tooth and some rotor 100 teeth of two and five phase stepper motor, five phase motor is mainly used in the occasion of high performance. So far, the industry developed countries very rare magnetic resistance type stepping motor. Stepper motor of the biggest producers were Japan, such as Japan step company, Oriental, SANYODENKI and MINEBEA and NPM company etc. , especially eastern company in Japan, whether the motor performance and appearance quality, or the means of production, all is the best in the world. Now Japanese stepper motor output (Including foreign owned company)Nearly 200 million units. Another conclusion is type HB stepping motor is more suitable for low speed high torque purposes; The RM type is suitable for the smooth running and speed greater than 1000 r/min purpose; And at the time of the low speed PM type of low cost, vibration and high speed, large torque of three-phase type PM stepping motor is better than the performance of the two phase motor.
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