Freescale's BLDC (brushless dc motor) control board for industrial and appliance applications is a system for controlling a 3-phase BLDC motors with three Hall-effect position sensors. This Reference Design is based on the MC68HC908MR8 8-bit microcontroller unit (MCU). The reference design consists of:
- Hardware design of the PCBs
- Development of the motor control algorithms and user interface
There are two board versions available, one for operating at 110-127 VAC and the other for operating at 220-240 VAC. The 3-phase inverter of the 110-127 VAC board operates at a nominal voltage of 180 VDC and 8 A RMS with 11 A peak. The inverter of the 220-240 VAC board operates at a nominal voltage of 320 VDC driving the same current.
View Product Image View Block DiagramFeatures
- MC68HC908MR8
- M68HC08 Family
- Single PCB for power and logic stages
- Discrete three-phase inverter
- Sensing circuitry for current, voltage and temperature
- User interface: 16 x 2 character display and two push buttons
- Optoisolated RS-232 interface for external microcontroller communication and for in-application programming
The example software consists of the following, but may be easily modified to perform other process cycles:
- PI speed controller for closed loop control
- Six-step BLDC commutation control based on three Hall-effect position sensors
- User interface control
- Two washing machine process implementations: wash process and spin process:
- Wash process consists of generating a sine wave of speed references, including positive and negative reference speeds
- Spin process consists of generating a start up curve of reference speeds and maintaining a fixed reference speed for a certain time. The PI speed controller operates in the 200 rpm up to 4000 rpm range
- Home/Industrial Applications
Hardware:
A bill of materials, schematic diagrams and gerber files are provided within the design reference manual, DRM007, to allow easy self-assembly of the boards.
Reference Design:
The BLDC Motor Control Board for Industrial and Appliance applications Reference Design was created in Mexico Applications Lab.
Supported Device Families
Increase Your Knowledge
- Design News Update Subscribe for design tips, tricks and product news delivered to your inbox.
- On-Demand Training Learn from the experts at your convenience.
