Sensorless BLDC Motor Control for AVR® Microcontrollers

2 Relevant Devices

3 Motor Control Theory

3.1 Sensored vs. Sensorless Control

3.2 Six-Step (Trapezoidal) Commutation

3.3 Power Stage

3.4 Modulation Techniques

3.5 Zero-Cross Point Detection

4 Firmware Implementation

4.1 System Overview

4.2 PWM Generation

4.3 Zero-Cross Detection

4.4 Zero-Cross Filtering

4.5 Thirty-Degree Timing

4.6 BEMF Commutation Noise Blanking

4.7 Handling Time-Related Events

4.8 Overcurrent Protection

4.9 Stall Detection

4.10 RPM Measurement

4.12 GUID-4231D32E-C57C-462C-9544-FBE040461A38-high.svg

5 Plug-In Module (PIM) Board Description

5.1 Pin Mapping

5.2 PIM Schematic

5.3 Configuration Board Schematic

5.4 Analog Functionality

5.5 User Interface

6.1 First Start-Up

6.2 Excel File Parameters Tuning

6.3 Changing the Control Mode

9 Revision History

The Microchip Website

Product Change Notification Service

Customer Support

Microchip Devices Code Protection Feature

Quality Management System

Worldwide Sales and Service