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VOLUME -23 NUMBER 7
Publication Date: 07/1/2008
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Special Feature: Assembly and Packaging
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July 2008 Issue
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ABM Intros Encoder-Free Motion Control Motors
Encoder-free motion control motor.
Milford, OH — New from ABM Drives, Inc. SINOCHRON
AC motors for encoder-free motion control is part of a new line of zero-slip, high-efficiency motors rated at 0.25-10 kW. The motors reportedly save initial cost, energy and space, while improving reliability. The new motors eliminate the need for an encoder in medium accuracy applications.
The motors produce torque equal to the next larger frame size of a standard AC motor. They exceed EPACT 1 efficiency in fractional horsepower sizes, delivering 25-40 percent higher efficiency, depending on the operating range. They can be used for a wide range of medium-dynamic, medium-accuracy applications, such as stair/car/truck lifts, crane drives, powder-coating machines, packaging machines, industrial doors and hydraulic pumps.
According to the company, the motors bridge the gap between standard AC motors with low dynamic and no position feedback, and servo motors with high-dynamic and high-accuracy. The motors reportedly have a much higher dynamic than standard AC motors, though less than a servo, with motion-control accuracy that's about 98 percent that of a servo. They are suitable for many applications where a servo motor represents overkill technology.
Totally enclosed in an aluminum housing, the new motors use a standard 3-phase stator winding with a custom-designed rotor with permanent magnets embedded in the stack. This produces a perfectly sinusoidal magnetic field and even flux distribution in the motor, resulting in smooth, constant-speed operation, independent of load, with no torque ripple. The perfectly sinusoidal back-EMF signal from the motor allows SDCs (sensorless drive controllers) to calculate speed and position without an encoder, eliminating the cost, reliability and additional wiring issues for an encoder. Typical accuracy can be under 1° when coupled to a gearbox, or ±5° at the motor shaft.
The high-efficiency motors are suitable for use in battery powered traction and steering applications or as a low-cost alternative to servos in medium-dynamic applications. The embedded permanent-magnet design produces a higher dynamic than a standard AC motor for faster response/acceleration with better speed control. It also allows field weakening for overspeed use at reduced output torque, while the high efficiency delivers longer battery life between charges. The motors are sealed to IP 65, and compliant with CE, UL, DIN EN 61800-3 and RoHS. Numerous hardware and software options are available, including gearboxes, brakes, connectors, etc.
Contact: ABM Drives, Inc., 2000 Ford Circle, Suite E, Milford, OH 45150
513-576-1300 fax: 513-576-4999 E-mail: firstname.lastname@example.org Web:
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