IPCS BLOG

Definition of a Servo System
Posted On: 06 September 2015 | By:IPCS

Electronic motion control is a multi-billion-dollar industry. Servo motion is a fraction of that industry, sharing it with non-servo motion, such as stepper motors and variable-frequency systems. A servo system is defined here as the drive, motor, and feedback device that allow precise control of position, velocity, or torque using feed-back loops. Examples of servomotors include motors used in machine tools and automation robots. Stepper motors allow precise control of motion as well, but they are not servos because they are run "open-loop," without tuning and without the need for stability analysis. The most easily recognized characteristic of servo motion is the ability to control position with rapid response to changing commands and disturbances. Servo applications commonly cycle a motor from one position to another at high rates. However, there are servo applications that do not need fast acceleration. For example, web-handling applications, which process rolled material such as tape, do not command large accelerations during normal operation; usually, they attempt to hold velocity constant in the presence of torque disturbances. Servo systems must have feedback signals to close control loops. Often, these feedback devices are independent physical components mechanically coupled to the motor; for example, encoders and resolvers are commonly used in this role. However, the lack of a separate feedback device does not mean the system is not a servo. This is because the feedback device may be present but may not be easily identified. For example, head-positioning servos of a hard-disk drive use feedback signals built into the disk platter rather than a separate feedback sensor. Also, some applications use electrical signals from the motor itself to indicate speed. This technology is often called sensorless although the name is misleading; the position is still sensed but using intrinsic motor properties rather than a separate feedback device.

 

Ref: www.eetimes.com


Tags:  

POST YOUR COMMENT

SEARCH HERE

ARCHIVES

Automation Training Cochin

Shenoy's Junction, MG Road
Ernakulam, Kerala, India
0484 404 6664,
mail@ipcsautomation.com


View Larger Map

Automation Training Coimbatore

Ram Nagar, Gandhipuram
Coimbatore, TN, India
04224223664, 9585526664
cbr@ipcsautomation.com


View Larger Map

Automation Training Calicut

Railway Link Road,
Calicut, Kerala, India
0495 - 401 6664, 3236034,
info@ipcsautomation.com


View Larger Map

Automation Training Mumbai

Sector 15, Vashi,
Navi Mumbai, India
+91 9539 09 6664
mumbai@ipcsautomation.com


View Larger Map

Automation Training Qatar

Wadi Al Raha Street,
Nuaija (43), Doha - Qatar
00974 66526664, 30012909
qatar@ipcsautomation.com


View Larger Map

Automation Training Trivandrum

Rema Plaza, S.S.kovil Road,
Thampanoor, Trivandrum, Kerala.
+91 99464 46664
trivandrum@ipcsautomation.com

Automation Training Chennai

SHEFFIELD TOWERS ,4TH STREET,
VILLIVAKKAM,CHENNAI-600 049
044-43530345​
chennai@ipcsautomation.com

Automation Training Dubai

Suntech Tower, Office # 205
Dubai Silicon Oasis, Dubai, U.A.E
+971-50-3831877, +971-50-3831866
dubai@ipcsautomation.com

Automation Training Saudi Arabia

Al-olaya street, P.O.Box: 15425.
Riyadh 11444, Saudi Arabia,
+966 554385530
e-mail: riyadh@ipcsautomation.com