These motors are always part of integrated motor-and-controller systems that provide extreme accuracy in positioning and speed. Common applications include computer-controlled manufacturing machines and process equipment. Servomotors are the largest category of motors for precision motion control. AC, DC brush-type, and brushless DC versions are available.
Closed-loop control systems, common with servomotors, use feedback devices to provide information to a digital controller, which in turn drives the motor. In some cases, a tachometer may be used for velocity control and an encoder for position information. In other cases, a resolver provides both position and velocity feedback.
Step (or stepper) motors, which move in fixed increments instead of rotating continuously, provide another means of precision motion control.
Usually, they are part of open-loop control systems, meaning there are no feedback devices.
Sunday, March 09, 2014
MOTORS FOR PRECISE MOTION CONTROL
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