The choice of servo motor electrical engineer

The choice of servo motor, the distinction between general electrical engineer in accordance with the

generally divided into stepper motor, a dc servo motor, brushless dc servo motor, ac servo motor,

with the increasingly progress of science and technology, many special servo motor arises at the

historic moment, such as piezoelectric motor, linear motor, and the voice coil motor, here we mainly

talk about general servo motor selection. Choose what kind of servo motor, to a large extent depends

on the physical properties of the load, the load of job characteristics, system requirements and the

working environment. Once the system requirement, no matter choose what kind of rotor cutting machine form of servo motor, the first thing to consider is right choose how much of a motor, main consideration physical characteristic of load, including the load torque, moment of inertia, etc. In the servo motor, usually measured in torque or force motor size, so choosing motor first to calculate the equivalent to the size of the shaft end load torque or force. After calculate the torque demand to set aside

part of allowance, generally choose motor for times the load torque, torque to the ac synchronous motor reliable running of motor.

In addition also needs computing reduced to the size of the shaft end load inertia, generally choose

the load inertia: motor rotor inertia, to ensure the rapidity of the servo system response. If appear

between the motor and load inertia, torque does not match the situation, so only at the expense of

speed, increase speed reducer between the motor and load, then you need balance. After selected by

how much torque motor, needs to do is to understand the working characteristic of load and working

environment. Work load features include such as load is high or low speed running, the acceleration

needs to how much, if demand is frequent start-stop, how frequency requirements, system running

precision and so on. Then choose servo motor also has no specific rules to follow, the key is your

choice of motor must adapt to work to beg you load movement. Such as the system accuracy is not high,

the movement speed around hundreds of the following (not more than 500 RPM) but not too low (greater

than 1), does not need to frequent start-stop, stepper motor is a kind of good choice. This is due to

the stepper motor open-loop control, low control precision, acmotortrading.blogspot.com high speed, motor torque will drop quickly, will take the fixed load, low speed will be rotating discontinuous crawl phenomenon, and the response of the stepper motor is not fast, not suitable for frequent startup

applications. When the speed a few turn to more than 3000 turn, relative to demand higher control

precision, can choose straight flow or ac servo motor.