- 學位論文
應用主動式緩衝電路之柔性切換式馬達驅動器
A Soft Switching Motor Drive Using an Active Snubber
摘要
本文提出一應用切換式電容緩振器之柔性切換馬達驅動器，其主要是針對電動機車常用的無刷直流馬達變頻器，加入切換式電容緩衝電路來達成柔性切換的目的，以減少切換損失、提高驅動及回充效率。此外，切換式電容緩衝電路只需考慮電容之容值，且元件數量少因此可達到低成本、高效率之優點。本文之驅動器切換控制方式係利用變頻器雙向導通之特性，配合無刷直流馬達三相電壓之相對關係，再以無刷直流馬達內部線圈作為電感器，並透過微處理器來控制變頻器內MOSFET之切換順序與時機，使馬達電動勢、馬達內部線圈、變頻器與電池四者構成一升壓電路。此切換控制方式可產生一反向力矩，使馬達達到煞車之目的，並將多餘的動能轉換為電能回充至電池，藉此改善電動機車續航力不足的缺點。最後，本文採用48V/750W輪轂馬達作為實驗系統來驗證本文所提之新型驅動電路架構之可行性。
並列摘要
This thesis proposes a pulse-width-modulation (PWM) inverter with the soft switching for the brushless DC motor (BLDCM) of the electric scooter. This motor drive could reduce switching losses, increase driving and regenerative efficiency. Moreover, this system could obtain some advantages, such as low cost and high efficiency which the capacitance is easily designed in the switched capacitor snubber. In the switching control method of this motor driver, a bidirectional conduction of inverter is used to match the relationship of the three-phase voltage of BLDCM, besides, the each internal winding of the BLDCM could be operated in a inductor. Thus a boost circuit is made up of the inductors, the MOSFET power switches, the motor electromotive force (EMF) and the input DC source. By this switching control approach, a reverse torque could be resulted in the electric brake that transfers the braking kinetic into the electric energy to the battery, thus the driving range of EV could be increased by this approach. Finally, this thesis uses a hub motor with 48V/750W to build an experimental system and some experimental results are provided to verify the correctness and feasibility of the proposed schemes.