alpha gearheads Ltd has combined a planetary gearhead with an ac servo motor to produce a rotary actuator which is half the length of conventional motor gearhead combinations, and 20% shorter than alpha's previous version. The TPM+ range includes five models with ratios from 16-91, maximum output torques from 40-1, 600Nm, and maximum output speeds from 325-431 rpm.
The helical tooth gearhead is said to operate quietly with little vibration and to result in backlash of less than 1 arcmin.
Maintenance-free permanent magnet brakes are connected to the stator. Drive components, such as pinions, belt pulleys, and rotary indexing tables, can be connected directly to the output flange. The actuator has a rounded body design to reduce the build-up of dirt.