Thursday, May 24, 2018
Publication Date: 07/1/2009
Archive >  July 2009 Issue >  New Products > 

Renishaw Encoder Drives Arcus Microstep Motor
Renishaw encoder in Arcus microstep motor.
Hoffman Estates, IL — Arcus Technology has developed the world's first all-in-one NEMA 11 microstep motor with driver, controller and encoder integrated into the motor's back cap, minimizing external electronics and wiring. The new DMX-K-SA-11 stepper motor uses Renishaw's magnetic AM256 magnetic encoder chip for real-time position verification.

The small package size of the magnetic chip encoder allows the motor to stay within the 1.1-in.-square form factor of the NEMA 11 standard. The new DMX-K-SA-11 stepper motor is suitable for size-sensitive biomedical, optical, semiconductor and similar applications requiring open-loop microstep motion with real-time position confirmation.

The integrated DMX-K-SA-11 is a 16-microstep driver that is capable of full, 1/2, 1/4, or 1/16 microsteps in three different stack sizes. Arcus Technology developed this design as an alternative to typical step motors that run open loop with sensors to detect position values after the move. The DMX-K-SA-11 is designed for customers and applications that require a position verification signal from the motor as well. By incorporating the Renishaw AM256 magnetic encoder chip into the back cap, ARCUS was able to add this capability with no change in size or add-on external components or encoders. The electronics inside the back cap have a maximum ambient operating temperature of +85°C (+185°F).

Renishaw's AM256 8-bit chip encoder is a solid-state, compact magnetic solution for non-contact angular position encoding over 360°, providing incremental, parallel, serial SSI and analog sinusoidal output options. The encoder's integrated circuit senses the angular position of a diametrically polarized, cylindrical magnet placed above it. A circular array of Hall sensors around the center of the IC detects the magnetic flux density distribution at the surface of the silicon and delivers a voltage representation of the magnetic field distribution. Sine and cosine voltage outputs from the Hall sensors vary with magnet position, and are converted to absolute position with a fast 8-bit flash interpolator. Relative changes of angle position are output as incremental A quad B signals with 8-bit/256 counts per revolution.

Contact: Arcus Technology, Inc., 3061 Independence Dr., Suite H, Livermore, CA 94551 925-373-8800 fax: 925-373-8809 E-mail: Web: or Renishaw, Inc., 5277 Trillium Boulevard, Hoffman Estates, IL 60192 847-286-9953 fax: 847-286-9974 E-mail: Web:

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