Hollow shaft actuator

Paul Boughton

Harmonic Drive has launched a range of miniature hollow-shaft servo actuators, that has been developed specifically for use in demanding applications, where highly accurate motion control and high torque capacity are required, or where operating space or weight are restricted.

As a result, the new range is suitable for use in the aerospace industry, where weight and size must be kept to a minimum.

Available in three gear sizes, 8, 11 and 14, the new range of FHA-C mini servo actuators features a choice of gear reduction ratios, including a 30:1 gear ratio, which is the first of its kind to be achieved with hollow shaft servo actuators.

The range includes what is believed to be the world's smallest servo actuator, capable of delivering 1.8Nm of torque from an integrated ac motor, gearbox and encoder that measures just 50mm2 in size and weighs 0.4Kg.

The new FHA-C mini servo actuators feature advanced Harmonic Drive technology to eliminate the effects of backlash, while the integrated ac servo motors provide exceptionally smooth torque curves, with output speeds of between 60 and 200 rpm.

A specially developed cross-roller output bearing provides superior resistance to axial and radial loads, and to high tilting moments, with a TTL-encoder being mounted directly onto the motor shaft to provide precise feedback data, to within 1.6 arc seconds.

In addition, each of the new FHA-C mini servo actuators is designed to interface directly with all industry standard servo controllers. Alternatively, Harmonic Drive can supply a fully digital SC-610 servo controller, which features Windows compatible software to allow each unit to be configured and operated quickly and simply.

By integrating a motor, gearbox, output bearing and encoder into a single, compact and lightweight unit, the new FHA-C servo actuators offer design and manufacturing engineers the opportunity to reduce both the time and cost associated with system design, specification and construction. Perhaps as importantly, the new servo actuators also allow system performance, precision and reliability to be significantly improved, while minimising size and weight.

For more information, visit www.harmonicdrive.co.uk


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