Reference kit eases design of brushless dc motor control - Embedded.com

Reference kit eases design of brushless dc motor control

EMBEDDED WORLD, Nurnberg — Luminary Micro has produced the Stellaris brushless dc (BLDC) motor control reference design kit (RDK-BLDC) with Ethernet and CAN.

The RDK-BLDC is a four-quadrant controller for three-phase brushless dc motors rated at up to 36 V, 500 W, and 60,000 RPM. Key features of the RDK include complete CAN and Ethernet network interfaces, a 32-bit Stellaris microcontroller with 256 kbytes of single-cycle internal flash memory, and embedded software to optimally control a wide range of motors in diverse applications.

Reference design kits mix ready-to-run software and hardware with an included motor, and providing comprehensive documentation with all software source code and hardware design files.

The RDK-BLDC contains everything required to evaluate and develop brushless dc motor control designs. The kit includes a brushless dc motor control module featuring Luminary Micro’s Stellaris LM3S8971 microcontroller with on-chip Ethernet MAC+PHY and CAN, a three-phase brushless dc motor, a graphical control program for Windows, and accompanying cables, source code, and documentation. The Stellaris LM3S8971 microcontroller handles all PWM synthesis, position, and analog sensing as well as Ethernet and CAN networking.

Only a few additional power ICs are necessary to complete the design. The entire circuit is built on a simple two-layer printed circuit board. The design includes an on-board braking circuit, optional power-managed fan for forced-air cooling, analog and digital control inputs, and screw terminals for all power and signal wiring.

Interrupt-driven embedded software provides four quadrant operation for precise motor control using Hall effect, quadrature, or sensorless operation modes. The graphical control program allows users to experiment with varying drive parameters and observe the effect on motor performance.

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Luminary Micro

  • This story appeared in the Embedded System Design Europe print edition covering January – February, 2008. European residents who wish to receive regular copies of this magazine can subscribe here.
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