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In einer Synchronmaschine sind mit der Ständerdrehstromwicklung und dem Polrad zwei drehfelderzeugende Einrichtungen kombiniert.
A distinction is made between revolving field and stationary field machines, although stationary field machines - with a few exceptions such as emergency power systems - do not play a major role.
A synchronous machine combines two means of generating rotary fields - the stator's three-phase winding and the rotor.