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CUI Devices


CUI Devices' Motion Group has announced the addition of two new series to its family of innovative AMT rotary position encoders. The new encoders support larger motor shaft sizes from 9mm up to 15.875mm (⅝”).

The AMT13 and AMT33 series encoders are based on CUI Devices' proprietary capacitive ASIC technology, offering the same high levels of durability, accuracy and immunity to environmental particulates as current AMT encoder models. The AMT13 is a series of incremental encoders. The AMT33 series are commutation encoders that generate standard U/V/W communication signals for commutating Brushless DC (BLDC) motors. The AMT33 is compatible with BLDC motors with 2, 4, 6, 8, 10, 12 or 20 pole pairs.

The user can program the AMT13 or AMT33 encoders to measure rotary position at any one of 22 resolution settings, from 48 Pulses Per Revolution (PPR) up to 4096 PPR. CUI Devices' AMT Viewpoint™ software makes it easy to configure the resolution and set the zero position. It can also be used with the AMT33 series to configure the pole count and direction of rotation.

This saves valuable time during development and assembly compared to optical encoders, which require the user to precisely rotate the optical disk and check via back-EMF to ensure that it is properly aligned. The One Touch Zero™ feature enables this time-consuming process to be completed in seconds.

The encoders provide CMOS voltage or differential line-driver outputs. They draw an operating current of just 16mA at 5V. Available in radial or axial orientations, the AMT13 and AMT33 series encoders are housed in a compact 42.3mm x 42.3mm x 13.5mm package.

Integrated kits, the AMT13-V kit and AMT33-V kit, give users further design flexibility, providing nine sleeve bore options from 9mm to 15.875mm (⅝”). Mounting tools make it simple to install the encoders on to a motor.

  • ±0.2° accuracy
  • Input-voltage range: 4.5V to 5.5V
  • Maximum speed: 4096rpm
  • 200ms start-up time
  • Operating-temperature range: -40°C to 125°C
  • Industrial equipment
  • Industrial automation
  • Robotics
  • Renewable energy systems


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