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New Piezo LEGS rotary motor features integral absolute encoder

13 June 2013

The latest rotary motor from PiezoMotor in Uppsala, Sweden is now available in the UK exclusively from Electro Mechanical Systems (EMS).

Expanding on the successful Piezo LEGS rotary motor series LR50/80 is a new reduced dimension LR17 with integrated encoder. The LR17 is the smallest rotary Piezo motor from EMS, and the first in a new series of rotary LEGS motors with integrated absolute encoders.

This small compact motor, with a diameter of just 17mm has all the benefits of Piezo LEGS technology and despite its small dimensions the motor develops an impressive stall torque of 30mNm without any backlash. Conventional motors of a similar size can only reach these torque levels with the addition of a gearhead, which adds to the size and introduces backlash into the system.

The motor construction is based on the established friction drive method which results in good self-locking characteristics, meaning that the motor can hold position without consuming any power.

The integrated 15 bit magnetic absolute encoder gives a closed loop resolution of 0.2 milli-radians (0.01º) and, as always with the Piezo LEGS technology, you get sub-micro-radian resolution in open loop.

The LR17 is the first motor in a series of four different sizes.

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