Brushless DC motor control design example

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Description

The brushless DC (BLDC) motor control design example describes how to connect and control up to four brushless DC motors using a single NXP microcontroller from the ARM968-based LPC2900 series, making this a low cost solution. Four dedicated motor control PWM blocks keep the CPU load low while running four motors. This allows the microcontroller to still perform other tasks in

Hardware used

• Hitex LPC2939 or LPC2929 evaluation board
• Hitex BLDC motor control extension board (4x)
• Interface board
• Maxon EC32 80W brushless servo motor with Quadrature Encoder Interface (QEI)

Three of the Hitex BLDC motor boards are driven as-is (spinning their on-board motors). The fourth board is driving the Maxon EC32 motor using the quadrature encoder interface. The interface board is used to create the correct pin-out that makes it possible to connect the four motor control extension boards to the LPC29xx evaluation board.

Block Diagram

Documentation

• BLDC Motor Control

Products

Below are recommended microcontrollers for use in BLDC motor control applications.

Comparison Table

Product	Pins	On-Chip Flash	On-Chip RAM	Comments
LPC2939	208	768KB	56KB	Base microcontroller used in the design example.
LPC2930	208	0KB	56KB	A lower-cost microcontroller with the same amount of pins but without on-chip flash memory.
LPC2929	144	768KB	56KB	Same on-chip memory as on the LPC2939 but in a smaller package and without USB Host functionality.
LPC2927	144	512KB	56KB	Same as LPC2929 but with less on-chip flash memory.

More Information

Image

BLDC Motor Control Demo at ESC SV 2009

Schematics

• LPC2939 Evaluation Board
• BLDC Motor Control Extension Board
• Interface Board

Example Code

• BLDC Motor Control

Bill of Materials

• BLDC Motor Controlhttp://www.lpcware.com/sites/default/files/bom.xls

Disclaimer

This design example shows possible hardware and software techniques used to implement the design. It is imperative that the viewer use sound engineering judgment in determining the fitness of this design example for any particular application. This design example may include information from 3rd parties and/or information which may require further licensing or otherwise. Additional hardware or software design may be required. NXP Semiconductors does not support or warrant this information for any purpose other than an informational design example.

	lpc2939.eval_.board_.schematics.pdf	143.6 KB
	documentation.pdf	243.48 KB
	bldc.board_.schematics.pdf	188.85 KB
	interface.board_.zip	2 MB
	example.code_.zip	72.55 KB
	bom.xls	3.87 KB