例句與造句

1. Mechanical commutation ( graphite or precious metal brushes ) , highest efficiency , low inductance , low electromagnetic interference , multiple combination possibilities with gears , feedback devices and control electronics
   機械換向器（石墨和金屬電刷） ，高效率，小電感，電磁干擾小，能與多種齒輪箱，反饋設備和控制電子元件配合使用。
2. The permanent magnet brushless dc motor is a dc motor using electronic commutation in place of mechanical commutation in fact , so it has excellent characteristics of dc motors , for example good start and timing performance . it simplifies the motor ' s structure and overcomes the friction disadvantages of ordinary dc motor because it does n ' t use mechanical commutation . it is extensively used in aviations , robots , digital machine tool and so on
   永磁無刷直流電動機實際上是以電子換向代替機械換向的直流電動機，因而保持了直流電動機的優(yōu)良特性，具有較好的起動和調速性能，又因它無需機械換向器使電機的結構簡單，可以從根本上克服一般有刷直流電動機易于產生換向火花的弊病，在航天、機器人、數控機床等許多工業(yè)領域已得到廣泛應用。
3. The chip jk3ce that is one of micro - controllers in motorola 68hc08 family is used as control unit in this system . the zero crossing point of the back emf can be obtained by comparing the terminal voltage with the virtual neutral point , then using the software of the system can figure out the commutation period . the electronic commutation replaces the mechanical commutation in this way
   本系統采用的控制芯片為motorola系列單片機中的jk3ce ，反電勢過零點可以通過比較電機端電壓和虛擬中點電壓來得到，將過零點信號送往單片機捕捉端口后由系統軟件來確定換相時刻，這樣就可以由電子換向裝置替代機械換相裝置，有利于提高系統運行的可靠性，并降低了系統維護的費用。
4. It's difficult to find mechanical commutation in a sentence. 用mechanical commutation造句挺難的