TY - GEN
T1 - Velocity measurement method for PMSMs through external stray magnetic field sensing
AU - Liu, Xuyang
AU - Pong, Philip W.T.
AU - Liu, Chunhua
N1 - Publisher Copyright:
© 2017 IEEE.
PY - 2017/12/21
Y1 - 2017/12/21
N2 - This paper presents a method to measure the velocity of permanent magnet synchronous motors (PMSMs) by sensing the external stray magnetic field (SMF) outside the stator surface. First, a magnetic circuit model of PMSM was developed to analyze the distribution of SMF. The key is to sense the SMF by a magnetic sensor and extract the frequency through a zero-crossing comparison to obtain the velocity. Then, the proposed method was validated by the finite-element-method (FEM). Moreover, a 5.5 kW three-phase PMSM testbed was built up for experimental verification. A triaxial tunneling magnetoresistive (TMR) sensor was utilized to sense the SMF in the testbed. The experimental results demonstrate that the measurement accuracy is less than ±0.15% in the range from 100 rpm to 1000 rpm. Thus, it verifies the proposed methodology can provide a cost-effective and high-accuracy alternative to the velocity measurement for PMSMs.
AB - This paper presents a method to measure the velocity of permanent magnet synchronous motors (PMSMs) by sensing the external stray magnetic field (SMF) outside the stator surface. First, a magnetic circuit model of PMSM was developed to analyze the distribution of SMF. The key is to sense the SMF by a magnetic sensor and extract the frequency through a zero-crossing comparison to obtain the velocity. Then, the proposed method was validated by the finite-element-method (FEM). Moreover, a 5.5 kW three-phase PMSM testbed was built up for experimental verification. A triaxial tunneling magnetoresistive (TMR) sensor was utilized to sense the SMF in the testbed. The experimental results demonstrate that the measurement accuracy is less than ±0.15% in the range from 100 rpm to 1000 rpm. Thus, it verifies the proposed methodology can provide a cost-effective and high-accuracy alternative to the velocity measurement for PMSMs.
KW - Magnetoresistive sensor
KW - PMSMs
KW - Stray magnetic field
KW - Velocity measurement
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U2 - 10.1109/ICSENS.2017.8233973
DO - 10.1109/ICSENS.2017.8233973
M3 - Conference contribution
AN - SCOPUS:85044321253
T3 - Proceedings of IEEE Sensors
SP - 1
EP - 3
BT - IEEE SENSORS 2017 - Conference Proceedings
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 16th IEEE SENSORS Conference, ICSENS 2017
Y2 - 30 October 2017 through 1 November 2017
ER -