adccommunitymod (AutomationDirect) asked a question.
Servo or AC Drive Unwind?
Created Date: April 21,2009
Created By: mbrown514
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I am currently designing controls for a poly-film unwind unit. The spindles will be either servo motors ordinary AC motors. The servos are substantially more expensive and in other companies I 've worked, AC motors and drive have usually done the trick when it came to web-based motion control. What exactly will I gain by using servos rather than AC drives?
Created Date: April 26,2009
Created by: Steve Bailey
One of the design criteria for a servo motor is that it be able to produce full rated torque continuously at zero RPM without overheating. Standard AC motors typically rely on a fan for cooling. AT low speed, the fan doesn't move enough air across the body of the motor to dissipate the heat.
Created Date: June 03,2009
Created by: DriveTech
One of the design criteria for a servo motor is that it be able to produce full rated torque continuously at zero RPM without overheating. Standard AC motors typically rely on a fan for cooling. AT low speed, the fan doesn't move enough air across the body of the motor to dissipate the heat.
They do make AC motors rated for continuous duty FLA @ zero speed without fan cooling. Just more expensive than standard AC motors.
Most tensioning applications work just fine with AC motor/drive combination. Servo motors give your more precise control over the tension in relation to response time. Which to use would depend on how critical the tension is and how fast it changes.
Created Date: April 21,2009
Created by: mbrown514
I am currently designing controls for a poly-film unwind unit. The spindles will be either servo motors ordinary AC motors. The servos are substantially more expensive and in other companies I 've worked, AC motors and drive have usually done the trick when it came to web-based motion control. What exactly will I gain by using servos rather than AC drives?