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Angular Velocity Estimation for Sensorless Brushless DC Motors

Martinsson, Victor (2024)
Department of Automatic Control
Abstract
In the automotive industry today, safety is of highest priority. ASIL is a safety standard that quantifies risk. This project investigates how a redundant speed estimate in a sensorless BLDC motor can be developed to meet ASIL B requirements. The proposed solution involves tracking the shape of the phase curve to determine the angular velocity. This is accomplished by changing the boundaries on the ADC, making it work as a comparator, to find limit events.
The results show that the algorithm successfully tracks the angular velocity. The error residual is noisy, with a maximum mean error of −5.64 rad/s. The error is believed to be due to unexpected disturbances on the phase curve. To get the final estimate, a moving average filter with... (More)
In the automotive industry today, safety is of highest priority. ASIL is a safety standard that quantifies risk. This project investigates how a redundant speed estimate in a sensorless BLDC motor can be developed to meet ASIL B requirements. The proposed solution involves tracking the shape of the phase curve to determine the angular velocity. This is accomplished by changing the boundaries on the ADC, making it work as a comparator, to find limit events.
The results show that the algorithm successfully tracks the angular velocity. The error residual is noisy, with a maximum mean error of −5.64 rad/s. The error is believed to be due to unexpected disturbances on the phase curve. To get the final estimate, a moving average filter with window size n = 6 and n = 18 is applied, corresponding to one and three mechanical revolutions.Window size n=6 is preferred to reduce delay, but n = 18 is more stable with the present disturbances. (Less)
Please use this url to cite or link to this publication:
author
Martinsson, Victor
supervisor
organization
year
type
H3 - Professional qualifications (4 Years - )
subject
report number
TFRT-6241
other publication id
0280-5316
language
English
id
9165361
date added to LUP
2024-06-18 13:36:08
date last changed
2024-06-18 13:36:08
@misc{9165361,
  abstract     = {{In the automotive industry today, safety is of highest priority. ASIL is a safety standard that quantifies risk. This project investigates how a redundant speed estimate in a sensorless BLDC motor can be developed to meet ASIL B requirements. The proposed solution involves tracking the shape of the phase curve to determine the angular velocity. This is accomplished by changing the boundaries on the ADC, making it work as a comparator, to find limit events.
 The results show that the algorithm successfully tracks the angular velocity. The error residual is noisy, with a maximum mean error of −5.64 rad/s. The error is believed to be due to unexpected disturbances on the phase curve. To get the final estimate, a moving average filter with window size n = 6 and n = 18 is applied, corresponding to one and three mechanical revolutions.Window size n=6 is preferred to reduce delay, but n = 18 is more stable with the present disturbances.}},
  author       = {{Martinsson, Victor}},
  language     = {{eng}},
  note         = {{Student Paper}},
  title        = {{Angular Velocity Estimation for Sensorless Brushless DC Motors}},
  year         = {{2024}},
}