Development of Permanent-magnet Synchronous Motor Drives for Auxiliary Automotive Electrical Compressors

• Main Authors: Chao-Po Liao, 廖昭博
• Other Authors: Jong-Chin Hwang
• Format: Others
• Language: zh-TW
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/84djds

碩士 === 國立臺灣科技大學 === 電機工程系 === 104 === Abstract 　　This thesis focuses on the design of three-phase permanent-magnet synchronous machine (PMSM) drive system, which can operate not only in motor mode to drive air compressor, but also in generator mode to charge the battery. Finite element analysis (FEA) software Maxwell/2D package are used to find the winding turns and wire diameter of PMSM for low operating voltage environment. Three-phase three-leg power inverter is proposed to drive the three-phase PMSM. Voltage space vector pulse-width modulation as well as current and speed closed-loop controls are introduced to obtain fast response with low total harmonic distortion of current and better efficiency. In addition, linear Hall-effect sensors are used to detect the rotor position and rotational speed to yield absolute rotor position and high resolution with low cost. Meanwhile, two-stage charging and its software program are provided for batteries with different specifications to result in fast battery charging and low THD of generator current. 　　The results of FEA give the no-load voltage of 9.84 V and its THD of 0.77 % for PMSM under generator mode at 2000 rpm. The corresponding experimental results are 9.42 V and 1.69 %, respectively. Close agreement between the analysis and measured results are observed. As for the bidirectional drive system, the 32-bit digital signal processor, TMS320F28069, is adopted as the control core. Most of the control strategy is accomplished by software program. When the machine is operated in motor mode under 24 V dc-bus voltage, 2000 rpm and 300 W load, the peak motor phase current is 32.7A, the THD of motor phase current is 1.87 % with overall efficiency of 83.8 %. While when the machine is operated under generator mode at 2000 rpm and 30 V dc-bus voltage, the charging voltage in constant voltage mode and the THD of generator phase current are 27.6 V and 6.95 %, respectively. Under the same condition, the charging current in constant current mode and the THD of generator phase current are 5.44 A and 5.38 %, respectively. The overall efficiency in generator mode is 78 %. The feasibility of the proposed system is verified experimentally.