| Summary: | 碩士 === 國立臺灣科技大學 === 電機工程系 === 105 === The thesis focuses on performance measurement of three-phase permanent-magnet synchronous motors and drives. It includes motor drive, digital automatic measurement subsystems, as well as man-machine interface. A three-leg three-phase inverter is designed and voltage space vector pulse-width modulation is adopted to enhance the utilization ratio of dc-link voltage. In addition, a resolver with its digital converter are introduced to improve the resolution of feedback signals from rotor position and speed. As to the digital automatic measurement subsystem, it consists of parameter as well as performance measurement. The former measures electrical and mechanical parameters by the motor mathematical model and mode switch, while the latter is drive performance measurement,which, together with the best operating point, are evaluated by three detection methods proposed. Finally for man-machine interface, LabVIEW
is applied to observe the motor dynamic response and generate measured
data for verification purpose.
The 32-bit digital signal processor, TMS320F28069, is adopted as the system core. For a 10-pole, interior-embedded permanent-magnet synchronous motor with rated power of 500 W and rated speed of 1000
rpm, the measured equivalent resistance is 41.5mΩ, the equivalent rotor flux linkage is 16.57 mV/(rad/s) , and the q-axis and d-axis average inductances are 0.755mH and 0.593mH, respectively. Whereas, the measured mechanical inertia, the viscous coefficient, and the static friction are 0.00678 N-m/(rad/s)^2 , 0.0147N-m/(rad/s) , and 0.198N-m, respectively. Meanwhile, performance evaluation of the overall drive system indicates that the q-axis and d-axis current vector as well as speed closed-loop control strategy is superior to other methods. The efficiency of the drive can be greater than 92% even with heavy dynamic load. In conclusion, the feasibility of the proposed performance measurement system has been verified by the experimental results.
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