This thesis develops a common digital signal processor (DSP) based condensing unit consisting of a sinewave position sensorless permanent-magnet synchronous motor (PMSM) driven compressor, a square-wave PMSM driven fan and a switch mode rectifier (SMR). In the proposed position sensorless sinewave PMSM drive, an internal model based back-EMF estimator is developed for performing its sensorless control. As to the square-wave PMSM fan drive, the voltage-mode direct duty PWM control with -conduction is employed. And its position sensorless control is conducted based on the sensed motor terminal phase voltage. In these two types of PMSM drives, the proper commutation instant shifts are made to yield improved motor driven performances, particularly under higher speeds. In addition, the smooth starting with less current transient is also considered.
In handling power quality affairs, a single-phase boost SMR front-end is employed to establish well-regulated and boostable DC-link voltage for the two motor drives with good line drawn power quality. To yield improved operating performance of the SMR, the robust hysteresis current-controlled pulse width modulation (HCC-PWM) schemes with fixed and sine bands are developed to yield closer current command tracking around zero-crossing points. Moreover, the random switching technique is supplied to yield uniform distributed current harmonic spectrum.
Finally, the developed PMSM driven PMSM is employed to drive an experimental condensing unit. The experimental performance comparative evaluation is made for the same condensing unit driven by an existing traditional square-wave PMSM drive and the developed sensorless sinewave PMSM drive. Better performances are observed by the proposed sine-wave position sensorless control method.

本論文旨在開發一以共通數位信號處理器為主之冷凍系統，包含弦波無位置感測永磁同步馬達驅動壓縮機、方波永磁同步馬達驅動風扇，以及切換式整流器透過市電所建立共通直流鏈之電壓。所建構之無位置感測弦波永磁同步馬達驅動系統，應用內部模式估得之反電動勢從事其無位置感測控制。至於風扇方波永磁同步馬達驅動系統，採 導通直接責任週電壓控制方波脈寬調變機構，其無位置感測控制由感測之馬達一相電壓為之。兩種永磁同步馬達驅動系統均採換相時刻前移增進其高速驅控性能。另外亦考慮降低啟動電流之軟性啟動技巧。
在電力品質規範方面，建構一單相前端切換式整流器，由電力公司建立調控良好且可升壓之共通直流鏈電壓，同時具有良好之交流入電電力品質。為了更增進切換式整流器之效能，本文提出一強健控制磁滯帶電流控制脈寬調變機構，改善電流在交流零交越點處之波形追控特性。此外，進一步開發隨機切換策略，應用於傳統遲滯帶與正弦遲滯帶之電流控制脈寬調變機構，以得到較均勻分佈之電流諧波頻譜。
最後，以所建構之無位置感測永磁同步馬達系統驅動一試驗性冷凍展示裝置，實測驗證比較傳統方波永磁同步馬達驅動與所建無位置感測弦波永磁同步馬達驅動之運轉特性，實測結果顯示後者具有較良好之性能。

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H. Others
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