Koford Engineering now sells a new series of 60-A 24-V digital sensorless drives. These drives feature 99% efficiency, compact size, and high performance. They run motors to 80,000 rpm and can run two-pole motors.

The design can run at 100% duty cycle compared to many other drives that are limited to 95% duty cycle. This gets top output from the motor.

The drives also ensure reliable startup even for loads with higher inertia. Operation at high altitude or in a vacuum is possible. The drive offers a brake function, and braking modules are available for applications where the power source cannot accept regenerated power from the load. Other features:

• All of these motor drives include a temperature sensor to prevent overheating. Closed-loop speed control is standard
• The drives work for standard motors and low inductance motors including slotless designs
• PWM frequency is 37 kHz
• Optional speed pot with knob and leads is available.

If the design engineer wants to control the drive using a microprocessor or computer, a 0-to-5-V control signal can be supplied.  The drive is 3.73 x 5.06 x .934 in. and weighs 6.5 oz. For more information, visit www.koford.com.