系统中使用无协议通讯解决交流电机的起制动和速度切换，实现数字化调速，简化控制系统。
Starting-braking and speed transformation of AD motor is solved by using non-agreement communication in the system, the numerical adjusting speed is realized, and the control system simplified.
交流拖动提升机电气制动是提升工艺中比较重要的一部分，目前交流异步电机拖动的提升机中，广泛应用的制动方式是低频发电制动和动力制动。
The electric brake of AC shaft hoist is an important part on hoisting technics low frequencies power generation brake and power are widely used in the shaft hoist of AC asynchronous drive at present.
交流异步电机的定位控制始终是一个未彻底解决的难题，为此介绍了一种用PLC软件控制电机制动达到准确定位的方法。
The problem of positioning ac motor is very complex. In order to position ac motor exactly, a simple and cheap control method is presented by me ans of PLC.
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