Portal crane sub frame and four-link arm two types, from the crane hoisting, luffing, slewing and walking four agencies ac frequency control, the machine USES PLC control, superior performance.
门座式起重机分单臂架和四连杆两种类型，起重机的起升、变幅、回转和行走四大机构均采用交流变频调速，整机采用PLC控制，使用性能优越。
Now commonly used servo motor is ac servo motor, the axial end in motor with photoelectric encoder, by examining the rotor Angle to frequency conversion control.
目前常用的伺服电机是交流伺服电机，在电机的轴端装有光电编码器，通过检测转子角度用以变频控制。
Because the AC asynchronous motor 'synchronous speed is determined by the frequency, we can control the AC asynchronous motor' speed by changing the supply power's frequency.
交流变频调速系统是利用异步交流电动机的同步转速随频率变化的特性，通过改变电机的供电频率而进行调速。
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