Sensorless BLDC Motor Control
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Freescale Semiconductor Application Note
Document Number: AN3832
Rev. 0, 04/2009
Contents
©Freescale Semiconductor, Inc., 2009. All rights reserved.
1Introduction
This application note describes the design of a 3-phase sensorless BLDC motor drive with Back-EMF
zero crossing. It is based on Freescale’s MC9S08AC16 that can be effectively used for motor-control applications.
The concept of the application is that of a speed-closed loop drive using Back-EMF zero crossing technique for positional detection. It serves as an example of a sensorless BLDC motor control system using Freescale’s MCU and 3-Phase BLDC/PMSM
Low-V oltage Motor Control Drive. It also illustrates the usage of general on-chip peripherals for motor-control applications.
This application note includes a description of the controller features, basic BLDC motor theory, system design concept, hardware implementation, software design including the FreeMaster software visualization tool, application setup, and demo operation.
1Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12HCS08 Advantages and Features. . . . . . . . . . . . . . . . . . 23BLDC Motor Control Theory . . . . . . . . . . . . . . . . . . . . . . 44
System Design Concept . . . . . . . . . . . . . . . . . . . . . . . . . 74.1System Specification. . . . . . . . . . . . . . . . . . . . . . . . 74.2Sensorless Drive Concept. . . . . . . . . . . . . . . . . . . . 75
Hardware. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95.1Hardware Outline. . . . . . . . . . . . . . . . . . . . . . . . . . . 95.2Component Description. . . . . . . . . . . . . . . . . . . . . 106
Software Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116.1MOSFET Driver Configuration. . . . . . . . . . . . . . . . 126.2PWM Generation & Timers . . . . . . . . . . . . . . . . . . 136.3Fault Handling. . . . . . . . . . . . . . . . . . . . . . . . . . . . 136.4Manual User’s Interface. . . . . . . . . . . . . . . . . . . . . 136.5FreeMASTER Communication . . . . . . . . . . . . . . . 136.6Others . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136.7Controller Usage . . . . . . . . . . . . . . . . . . . . . . . . . . 137
Demo Setup and Operation. . . . . . . . . . . . . . . . . . . . . . 147.1Hardware Setup. . . . . . . . . . . . . . . . . . . . . . . . . . . 147.2Software Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . 157.3Sensorless BLDC Demo Operation. . . . . . . . . . . . 168
References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Sensorless BLDC Motor Control Using MC9S08AC16
by:Petr Frgal
Freescale Czech System Laboratories Roznov pod Radhostem, Czech Republic