Tuesday, October 02, 2012

Commutation Encoder Offers Flexibility

CUI Inc announced a new addition to its high resolution, low-cost AMT encoder line with the AMT303 series. The encoder generates standard U/V/W commutation signals for vectoring current to brushless motors. Resolutions can be set through the AMT303's SPI (Serial Peripheral Interface). Commutation output can accommodate brushless motors with 2, 4, 6, 8 or 10 pole pairs, and is also selectable via the SPI. The AMT303 offers supplementary incremental A, B, and Z channels for various servo positioning and startup sequences. Additional options include nine mounting patterns and ten bore sizes, creating a flexible platform that is able to mate with many industry standard motors.

The AMT303 generates position information using CUI's patented, capacitive code generation system coupled with a proprietary ASIC. This technology is immune to environmental particulates and magnetic interference, creating a reliable, economical and stable control and positioning solution. The encoder consumes a maximum 10 mA at 5 Vdc, making it ideal for any application where power consumption is a concern.

The AMT303's SPI affords higher throughput and simpler hardware interfacing than I²C or SMBus. Utilizing TCL code, the on-board PIC 16F690 MCU operates at up to 10MHz providing for high speed applications. Zero position may be set by SPI command or ground trigger, removing the need for time consuming mechanical alignment in the mounting process. Additionally, an onboard EEPROM can store up to 128 bytes of customer data. A demo board is available for stand-alone demonstration, PC access to SPI interface and example TCL code.

"We believe the AMT303 series represents a breakthrough in commutation encoders," stated James Seiler, CUI's Encoder Product Manager. "Users will really be able to leverage the benefits of our ASIC-based system. When compared to optical encoders typically used in commutation applications, the AMT303 will bring a level of ruggedness and ease of use unrivaled in the industry."

The AMT303 and AMT303 demo kit will be available through Digi-Key in Q2 of 2010 with prices starting at $46 per unit. Please contact CUI for OEM pricing.

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