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Sensorless control of brushless DC motor using back EMF commutation

Sensorless control of brushless DC motor using back EMF commutation
Sensorless control of brushless DC motor using back EMF commutation

Brushless dc motors require rotor position information for commutation and speed control. Resolvers, encoders or Hall effect devices are often used but they increase cost and size of the system. Therefore, a great deal of work on sensorless control of brushless dc motor has been carried out for a few years. This report describes the principles and implementation of a sensorless control system using the principle of Back Electromotive Force (back emf) Commutation. As the proposed control scheme uses an open loop procedure to start the motor, the open loop to closed loop transition has been investigated. The system allows a rehable control and reversal of the motor, even at low speed. The implementation of the control algorithm in a TMS320F240 DSP is described. The test results on a 20 V, 10000 rpm, two-poles motor have been found satisfactory when run with no load. The load tests, made by holding the shaft, showed that the motor sometimes stopped at low speed.

University of Southampton
Bomassi, David
0d349fa3-c360-4308-b54e-ea3bd128687e
Bomassi, David
0d349fa3-c360-4308-b54e-ea3bd128687e

Bomassi, David (2000) Sensorless control of brushless DC motor using back EMF commutation. University of Southampton, Doctoral Thesis.

Record type: Thesis (Doctoral)

Abstract

Brushless dc motors require rotor position information for commutation and speed control. Resolvers, encoders or Hall effect devices are often used but they increase cost and size of the system. Therefore, a great deal of work on sensorless control of brushless dc motor has been carried out for a few years. This report describes the principles and implementation of a sensorless control system using the principle of Back Electromotive Force (back emf) Commutation. As the proposed control scheme uses an open loop procedure to start the motor, the open loop to closed loop transition has been investigated. The system allows a rehable control and reversal of the motor, even at low speed. The implementation of the control algorithm in a TMS320F240 DSP is described. The test results on a 20 V, 10000 rpm, two-poles motor have been found satisfactory when run with no load. The load tests, made by holding the shaft, showed that the motor sometimes stopped at low speed.

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Published date: 2000

Identifiers

Local EPrints ID: 464228
URI: http://eprints.soton.ac.uk/id/eprint/464228
PURE UUID: 15d4eba0-af9c-4627-9b63-d49c9d8db962

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Date deposited: 04 Jul 2022 21:41
Last modified: 16 Mar 2024 19:21

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Contributors

Author: David Bomassi

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