FAULT DIAGNOSIS OF SENSORS FOR T-TYPE THREE-LEVEL INVERTER FED DUAL THREE-PHASE PMSM DRIVES
Xueqing Wang 1
,  
Zheng Wang 1  
,  
Wei Wang 1
,  
 
 
More details
Hide details
1
Southeast University, China
 
KEYWORDS:
TOPICS:
ABSTRACT:
In order to improve the reliability of motor system, this paper investigates the sensor-fault diagnosis methods for T-type inverter fed dual-three phase PMSM drives. Generally, a T-type three-level in-verter fed dual three-phase motor drive usually utilizes four phase-current sensors, two DC-link volt-age sensors and one speed sensors. A series of diagnostic methods have been comprehensively pro-posed for the three types of sensor faults. Both the sudden error change and gradual error change of sensor faults are considered. Firstly, the diagnosis of speed-sensor fault is achieved by monitoring the error between the rotating speed of stator flux and the value from speed sensor. Secondly, the large high-frequency voltage ripple of voltage difference between the estimated voltage and the reference voltage is used to identify the voltage-sensor faults and the faulty voltage sensor is determined ac-cording to the deviation of voltage difference. Thirdly, the abnormal current amplitude on harmonic subspace is adopted to identify the current-sensor faults and the faulty current sensor is located by distinguishing the current trajectory on harmonic subspace. The experiments have been taken on a laboratory prototype to verify the effectiveness of the proposed fault diagnosis schemes.
CORRESPONDING AUTHOR:
Zheng Wang   
Southeast University, China, School of Electrical Engineering, Southeast University, No. 2 Si Pai Lou, Xuanwu District, 210096 Nanjing, China
eISSN:2543-4292
ISSN (print):2451-0262