Configuration of Servo System
The following diagram illustrates a servo system in detail:
(1) Controlled system: Mechanical system for which the position or speed is to be controlled.This includes a drive system that transmits torque from a servomotor.
(2) Servomotor: A main actuator that moves a controlled system. Two types aravailable: AC servomotor and DC servomotor.
(3) Detector: A position or speed detector. Normally, an encoder mounted ona motor is used as a position detector.
(4) Servo amplifier: An amplifier that processes an error signal to correct the difference between a reference and feedback data and operates theservomotor accordingly. A servo amplifier consists of a
comparator, which processes error signals, and a power amplifier,which operates the servomotor.
(5) Host controller: A device that controls a servo amplifier by specifying a positionor speed as a set point.
Servo components (1) to (5) are outlined below:
(1) Controlled system
In the previous figure, the controlled system is a movable table for which the positionor speed is controlled. The movable table is driven by a ball screw and is connected tothe servomotor via gears.
So, the drive system consists of:
Gears + Ball Screw
This drive system is most commonly used because the power transmission ratio(gear ratio) can be freely set to ensure high positioning accuracy. However, play in thegears must be minimized.
The following drive system is also possible when the controlled system is a movable
table:
Coupling + Ball Screw
When the power transmission ratio is 1 :1, a coupling is useful because it has noplay.
This drive system is widely used for machining tools.
To develop an excellent servo system, it is important to select a rigid drive system that has no play. Configure the controlled system by using an appropriate drive system for the control purpose.
Timing Belt + Trapezoidal Screw Thread
A timing belt is a coupling device that allowsthe power transmission ratio to be set freelyand that has no play.
A trapezoidal screw thread does not proviexcellent positioning accuracy, so can be treated as a minor coupling device.
OTHER SUPERIOR PRODUCTS
| Yasakawa Motor, Driver SG- | Mitsubishi Motor HC-,HA- |
| Westinghouse Modules 1C-,5X- | Emerson VE-,KJ- |
| Honeywell TC-,TK- | GE Modules IC - |
| Fanuc motor A0- | Yokogawa transmitter EJA- |
Contact person: Anna
E-mail: wisdomlongkeji@163.com
Cellphone: +0086-13534205279