Introduction to Servo Motor Control Unit

by Mike H. | January 9, 2021 9:01 am

AC Servo Motors - Motion Control Products Ltd.

In commercial type servo-electric motors, the placement feedback sensor is typically a high accuracy encoder, while in the smaller sized RC or pastime servos the position sensing unit is typically an easy potentiometer. The real setting captured by these gadgets is fed back to the mistake detector where it is contrasted to the target position. After that, according to the error, the controller remedies the position of the electric motor to match with the target placement.

Leisure activity servos are little in dimension actuators utilized for regulating RC playthings autos, planes, boats, etc. They are utilized by design trainees for prototyping in robotics, naturally motivated robotics, developing robot arms, humanoid robots, and so on.

How RC Servo Work

Inside a leisure activity servo, there are four major parts, a DC electric motor, a potentiometer, a gearbox, and a control circuit. The DC motor is a high speed, as well as low torque; however, the transmission minimizes the rate to around 60 RPM, as well as at the exact same time enhances the torque.

The potentiometer is affixed on the last equipment or the output shaft, so as the electric motor rotates the potentiometer rotates also, hence creating a voltage that relates to the outright angle of the result shaft. In the control circuit, this potentiometer voltage is contrasted to the voltage originating from the signal line. If required, the controller triggers an integrated H-Bridge which allows the electric motor to revolve in either direction till both signals get to a distinction of zero.
A servo motor control unit [ชุด ควบคุม เซอร์ โว มอเตอร์[1], which is the term in Thai] is managed by sending out a collection of pulses with the signal line. The regularity of the control signal ought to be 50Hz or a pulse ought to take place every 20ms. The size of the pulse determines the angular setting of the servo, as well as these sorts of servos, can typically rotate 180 degrees, they have a physical restriction of travel.

Endnotes:
  1. ชุด ควบคุม เซอร์ โว มอเตอร์: https://www.mitsubishifa.co.th/en/NewsDetails.php?id=MjM=

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