TY - JOUR
T1 - A 12-Step Sensorless Drive for Brushless DC Motors Based on Back-EMF Differences
AU - Wang, Samuel
AU - Lee, An-Chen
PY - 2015/6/1
Y1 - 2015/6/1
N2 - This paper presents a new 12-step sensorless drive for brushless dc motor based on back-electromotive force (back-EMF) differences, which are estimated from the disturbance observer (DOB) structure. Availability of rotor position information with a resolution of 30° and commutation without phase shift are the advantages of using the back-EMF differences. Unlike the conventional methods that obtain part of the back-EMF signal from the manipulation of three phase voltages, the proposed DOB structure can access the entire back-EMF profile. By designing a proper low-pass filter in the DOB structure, the back-EMF difference can be well detected with lower sensor noise. Compensation of delay commutation introduced by the filter is also discussed. Experiment results showed that the proposed sensorless drive is capable of running the motor in lower speed, and performs better under different speed and load torque as compared with the conventional method.
AB - This paper presents a new 12-step sensorless drive for brushless dc motor based on back-electromotive force (back-EMF) differences, which are estimated from the disturbance observer (DOB) structure. Availability of rotor position information with a resolution of 30° and commutation without phase shift are the advantages of using the back-EMF differences. Unlike the conventional methods that obtain part of the back-EMF signal from the manipulation of three phase voltages, the proposed DOB structure can access the entire back-EMF profile. By designing a proper low-pass filter in the DOB structure, the back-EMF difference can be well detected with lower sensor noise. Compensation of delay commutation introduced by the filter is also discussed. Experiment results showed that the proposed sensorless drive is capable of running the motor in lower speed, and performs better under different speed and load torque as compared with the conventional method.
KW - Back electromotive force (back-EMF) detection
KW - back electromotive force differences
KW - brushless dc motor (BLDC)
KW - delay compensation
KW - disturbance observer (DOB)
KW - sensorless control
KW - torque ripple
UR - http://www.scopus.com/inward/record.url?scp=85028230675&partnerID=8YFLogxK
U2 - 10.1109/TEC.2014.2370672
DO - 10.1109/TEC.2014.2370672
M3 - Article
AN - SCOPUS:85028230675
SN - 0885-8969
VL - 30
SP - 646
EP - 654
JO - IEEE Transactions on Energy Conversion
JF - IEEE Transactions on Energy Conversion
IS - 2
M1 - 6975137
ER -