1769-L35E

供電方式：直流電機需要直流電源來供電，而交流電機需要交流電源來供電。直流電源是指電壓和電流都是單向的，而交流電源則是指電壓和電流都是交替變化的。

　　構造：直流電機的構造比較簡單，通常由電樞、永磁體和換向器等組成；而交流電機的構造相對復雜，通常由定子、轉子、勵磁系統和控制系統等多個部分組成。

　　工作原理：直流電機的工作原理是基于洛倫茲力的作用，即在磁場中的導體受到電流作用后，會受到一個力矩，從而轉動電機。交流電機的工作原理則是基于旋轉磁場的作用，即通過定子上的三相繞組，在交流電源的作用下形成旋轉磁場，從而帶動轉子轉動。

　　調速方式：直流電機的調速比較靈活，可以通過調節電樞電壓、永磁場強度和換向器的工作方式等來實現；而交流電機的調速相對困難，通常需要通過變頻器等外部裝置來實現。

　　綜上所述，直流電機和交流電機的供電方式、構造和工作原理等方面都存在較大的差異，因此在實際應用中也存在著較大的差別。

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