Geared motor is compact precision actuator
A
Wittenstein product story
Edited by the Engineeringtalk editorial team
Apr 20, 2006
The TPM is a geared motor (rotary actuator) based on an AC servomotor and high-precision planetary gearing.
The TPM is a small and highly dynamic gearmotor developed as a product representing the highest level of integration.
The TPM is a geared motor (rotary actuator) based on an AC servomotor and high-precision planetary gearing.
The size of this compact unit is less than half compared with a conventional motor and gear combination.
The TPM rotary actuator is characterised by an extremely high dynamic response: with an overall length of 186mm, the TPM 50 builds up a maximum output torque of 500Nm at a mass moment of inertia of 2.9kgcm2 - until now impossible values.
This high dynamic response is due to the considerable reduction in the moment of inertia: the mass moment of inertia of the actuator has simply been reduced by 50% compared with a conventional solution with separate motor and gear unit.
The reason lies in its design: the rotor inertia is considerably reduced by the low-speed motor and the mass inertia on the gear side is reduced by around 90% because the gear pinion is directly integrated into the motor shaft, thus eliminating the need for a clutch.
For example, with a load inertia of 150kgcm2 at the output, loads can be moved through 180 degrees with utmost precision in less than 150ms.
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