Brushless DC Motor Line Offers Integrated Variable Speed Control

Applications requiring variable speed control, precision performance with low torque ripple, and high power in a compact, 1.73'' in diameter package are said to represent the primary market for NT Dynamo brushless DC motors. The new DC motor line comes in four sizes, can deliver 5 to 70 oz.-in. of continuous torque, has an integrated digital drive having an operating life of 20K+ hours, and is expected to be designed into products such as medical equipment, office machines, blowers, movement simulators, and ticket dispensers. The modular-type motors also offer three different levels of drive performance, an optical encoder, computer communications, and NEMA 23 mounting. The sub-fractional servomotors integrate an internal programmable electronic control module and a brushless motor into a single unit. The control module can be configured to operate in speed, voltage and torque modes, controlled by computer, PLC or standard operator controls. The NT Dynamo motors can handle input voltages of 10 to 48 Vdc with output speed ranges of 1,000 to 6,000 rpm. Additional features include: a class B insulation system, ring magnets instead of arcs, a bearing system, and 2- or 4-quadrant operation. And the NEMA 4 mounting face option makes it possible to retrofit NT Dynamos for use with standard gearheads. HURST MANUFACTURING, St. Louis, MO. (888) 225-8629.