Amplifier for linear motors

-- Control Engineering, 9/1/2001

Westwood, Mass. - To obtain high performance, direct-drive linear motors require acceleration to several 'Gs' for short-duration, typically in the 50-100 msec range. Model 7225X1-50 servo amplifier supplies the higher level of peak current needed-±50 A for 250 msec. Continuous output is rated at ±15 A. The amplifier drives brushless linear motors in torque mode. 'Carrier cancellation modulation,' is used to make the power bridge circuit inherently linear over its output range, as well as produce low ripple current relative to total load current, according to Copley Controls. Electrical isolation between signal and motor drive circuits allows Model 7225X1-50 to run on simple rectified ac line power. Pricing is under $375 for 100-249 units.


Copley Controls Corp.