Sensorless Control of Brushless DC Motor in Hydraulic Application
(2015)Department of Automatic Control
- Abstract
- In this master thesis we have studied the possibilities of implementing and controlling the speed of a brushless DC motor in an hydraulic application developed by BorgWarner TorqTransfer Systems AB. The hydraulic application is a coupling that give vehicles intelligent all-wheel drive.
Today, the hydraulic application uses hydraulic pressure controlled by an ordinary DC motor to produce the all-wheel drive. The purpose of this thesis was to test if the DC motor could be substituted to a brushless variant by looking at different ways of controlling the speed of the brushless motor and evaluate its possibilities. The controllers were tested and evaluated by constructing a model of the brushless DC motor, together with different... (More) - In this master thesis we have studied the possibilities of implementing and controlling the speed of a brushless DC motor in an hydraulic application developed by BorgWarner TorqTransfer Systems AB. The hydraulic application is a coupling that give vehicles intelligent all-wheel drive.
Today, the hydraulic application uses hydraulic pressure controlled by an ordinary DC motor to produce the all-wheel drive. The purpose of this thesis was to test if the DC motor could be substituted to a brushless variant by looking at different ways of controlling the speed of the brushless motor and evaluate its possibilities. The controllers were tested and evaluated by constructing a model of the brushless DC motor, together with different controllers, in Simulink.
Two kinds of controllers were implemented and tested in Simulink. The first one was field-oriented control with field weakening, and the second one was sixstep commutation. Field-oriented control is a very computationally heavy method compared to the six-step commutation which is one of the simplest ways to control a brushless DC motor.
What makes the control implementation a little bit harder is that there can be no angle- or speed sensors involved, so both control methods need to be sensorless. The field-oriented control with field weakening was made sensorless with a sliding mode observer and the six-step commutation was made sensorless via back-EMF sensing.
The results show that the alternative that seems to have the upper hand is the field-oriented control, even if it may be harder to implement. It also shows that if some more work is put on the control design, the six-step commutation may also be a good candidate. Overall, this thesis shows that it is theoretically possible to implement a brushless DC motor in the hydraulic application. (Less)
Please use this url to cite or link to this publication:
http://lup.lub.lu.se/student-papers/record/7442408
- author
- Djup, Martin and Allar, Elias
- supervisor
- organization
- year
- 2015
- type
- H3 - Professional qualifications (4 Years - )
- subject
- ISSN
- 0280-5316
- other publication id
- ISRN LUTFD2/TFRT--5979--SE
- language
- English
- id
- 7442408
- date added to LUP
- 2015-06-26 13:09:49
- date last changed
- 2015-07-02 17:02:40
@misc{7442408,
abstract = {{In this master thesis we have studied the possibilities of implementing and controlling the speed of a brushless DC motor in an hydraulic application developed by BorgWarner TorqTransfer Systems AB. The hydraulic application is a coupling that give vehicles intelligent all-wheel drive.
Today, the hydraulic application uses hydraulic pressure controlled by an ordinary DC motor to produce the all-wheel drive. The purpose of this thesis was to test if the DC motor could be substituted to a brushless variant by looking at different ways of controlling the speed of the brushless motor and evaluate its possibilities. The controllers were tested and evaluated by constructing a model of the brushless DC motor, together with different controllers, in Simulink.
Two kinds of controllers were implemented and tested in Simulink. The first one was field-oriented control with field weakening, and the second one was sixstep commutation. Field-oriented control is a very computationally heavy method compared to the six-step commutation which is one of the simplest ways to control a brushless DC motor.
What makes the control implementation a little bit harder is that there can be no angle- or speed sensors involved, so both control methods need to be sensorless. The field-oriented control with field weakening was made sensorless with a sliding mode observer and the six-step commutation was made sensorless via back-EMF sensing.
The results show that the alternative that seems to have the upper hand is the field-oriented control, even if it may be harder to implement. It also shows that if some more work is put on the control design, the six-step commutation may also be a good candidate. Overall, this thesis shows that it is theoretically possible to implement a brushless DC motor in the hydraulic application.}},
author = {{Djup, Martin and Allar, Elias}},
issn = {{0280-5316}},
language = {{eng}},
note = {{Student Paper}},
title = {{Sensorless Control of Brushless DC Motor in Hydraulic Application}},
year = {{2015}},
}