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自动售货机的PLC系统设计

时间:2010-9-18来源:http://myeducs.cn 作者: 网学

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  Introduction

  1. What is a stepper motor?

  Stepper motor is the electrical impulse signals into angular displacement or linear displacement of the open-loop control components. In the non-overload case, the motor speed, and stop location depends only on pulse frequency and pulse number, regardless of the load change, that is, to add a pulse motor, motor is turned a step angle. The existence of this linear relationship, coupled with only a periodic error of stepper motors without the accumulated error and so on. Although the stepper motor has been widely applied, but the stepper motor does not like the normal DC motor, AC motor in conventional use. It must be double-ring pulse signal, power driver circuit composed of control systems use only. Therefore, make good use of stepper motor is not an easy task, which involves mechanical, electrical, electronics and computers, and many other professional knowledge. At present, the production of stepper motor manufacturers do a lot, but with professional and technical personnel can develop their own, the development of the manufacturers is very small, most of the manufacturers is only one, 20 people, even the most basic equipment at all. Only in a blind imitation stage. This gives families the product selection, use, causing a lot of trouble. Was signed in the above, we decided to take a wide range of sensitive sub-type stepper motor as an example. Describes the basic working principle. I hope, to the user in the selection, use, and the machine for improvement help.


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