Construction machinery if the use of diesel engines, the use of motors, the general choice of DC motor or AC motor?.
The most economical way is to use a three-phase induction motor, not a particular case, without considering other motors.
The AC power is large, the DC power is small, and as for synchronous asynchronous, it is not very important considerations, depending on the drive you select, and you need the specific speed, load capacity
Synchronous motor power factor is high, even can be used to phase modulation, but the capacitor screen compensation can solve the power factor problem; what engineering machinery must rotate speed and load size is irrelevant? Synchronous motor control is complex, costly and troublesome to maintain, not so fun.
