Midrange servoamplifier takes up the slack 5-18-98
By Design News Staff -- Design News, May 17, 1998
May 18, 1998 Design News
FEATURED PRODUCT
Midrange servoamplifier takes up the slack
by John Lewis, Northeast Technical Editor
Automated fastening machines require precise velocity and torque control. Winding machines need high-speed wire take up, and precise tension control. That's where Copley Control's Model 5424AC could simplify controls on fastening or winding machines--as well as pick-and-place, robots, automated assembly equipment, and material testing machines.
It features remote speed/torque mode switching, and drives brushless dc servomotors (to 2.5 hp continuous) with power direct from AC mains.
The servoamplifier's current monitor provides feedback to the controller. As fasteners take up toward the end of travel, sensors detect increasing winding current and signal the controller which then cues the amplifier to switch from velocity to torque mode. In the torque mode maximum current settings prevent the motor from applying excessive torque to delicate loads, and from overheating.
Three velocity loops add to the servoamplifier's flexibility. A frequency-to-voltage (F/V) converter emulates traditional motor-driven tachogenerators. Result: speed feedback without a separate motor-driven tachometer. Another velocity mode uses the F/V converter to transform digital shaft encoder signals to analog velocity feedback. The third mode uses IR compensation to control the motor back emf and maintain constant velocity as the load changes. Adjustable soft start capability smoothes mechanical operations.
No related content found.
