RDDSCSENSORLESSBLDC: 3-Phase Brushless DC Motor Sensorless Control Reference Design using 56F801X

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RDDSCSENSORLESSBLDC: 3-Phase Brushless DC Motor Sensorless Control Reference Design using 56F801X

RDDSCSENSORLESSBLDC: 3-Phase Brushless DC Motor Sensorless Control Reference Design using 56F801X

Overview

This reference design is a 3-phase brushless DC (BLDC) motor sensorless drive for fans, pumps and compressors based on the low-cost NXP® 56F801x digital signal controllers (DSCs).

  • The concept is a closed-loop speed-controlled BLDC drive with no need for position or speed sensors
  • AIt serves as a reference design for a BLDC motor sensorless control system, ideal for fan, pump and compressor applications
  • Power stages used by the application are designed for 12V DC line voltage and 3Aor 8A output current
  • The reference manual provides a detailed description of the application, including design of the hardware and the software

Features

  • 3-phase brushless DC motor sensorless drive
  • Designed to fit into fan, pump and compressor applications
  • Uses 56F8013 32 MIPS Digital Signal Controller
  • Available for two power stages and two motors
  • Input power supply voltage +12 VDC for power stages
  • Control techniques incorporate:
    • Sensorless, trapezoidal control of 3-phase BLDC motor with back-EMF sensing
    • ADC zero crossing sensing for sensorless control
    • Closed-loop speed control using PI controller
    • Adjustable DC-bus current limitation PI controller
    • Motoring mode
    • Both directions of rotation
  • Speed range: 200-2000 and 800-8000 RPM (depending on the motor used)
  • Manual interface (RUN/STOP switch, UP/DOWN pushbuttons)
  • FreeMaster interface for monitoring, controlling and tuning
  • Fault protection (DC-bus over-current, DC-bus under-voltage, DC-bus over-voltage)
  • Automatic calibration of phase back-EMF measurements
  • 20 kHz PWM switching frequency
  • Easy to tune for different power stages and motors.

Block Diagram

RDDSCSENSORLESSBLDCBLK.gif

Board

RDDSCSENSORLESSBLDCIMG.jpg

Design Resources

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最終更新日:
‎08-11-2020 02:09 PM
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