Harmonic Drive LLC now sells actuators with surface run-out of less than 10 μm. These SHA-CG models are the newest rotary actuators from the manufacturer.

The SHA-CG units have a compact and hollow-shaft configuration to satisfy an array of applications.

Ideal for machine tool applications, the SHA Series of brushless actuators provide high torque for fast acceleration and positioning.

SHA-CG actuators are composed of a Harmonic Drive CSG zero-backlash gear combined with a brushless servomotor with an encoder resolution at the output up to 20,971,520 pulse/rev.

The actuators also come with an optional brake. Positional accuracy exceeds 1 arc-min and repeatability is better than ±5 arc-sec; torque output is to 3,400 Nm.

A robust cross-roller bearing allows mounting of large loads directly to the actuator without the need for additional support.

The SHA-CG has a torque-to-weight ratio to eight times that of comparable housed direct-drive motors, and a torque-to-volume ratio to six times greater … for a more compact and light-weight machine design.

SHA-CG direct-drive specifications

High accuracy with a zero-backlash Harmonic Drive gear reducer; compact, flat, hollow shaft

Hollow-shaft diameter from 17 to 45 mm

Available in four sizes … 20, 25, 32, 40

Speeds to 120 rpm

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