In the ac motor, he is excited, excited, and excited. What is the difference between
He wound, is that the rotor is a set of power supply, the stator excitation coil is another power supply, two sets of power supply is independent and not directly on the electric contact, unless the closed-loop control of the motor in general mechanical and electrical properties are hard, and is adjustable speed and torque. That features more hard!
Series, the stator coil and armature coil in series, with a power supply, the characteristics of the motor is more soft, speed with load up and down is large! Shunt, stator coil and armature coils in parallel, is also a power supply, and the characteristics of the shunt motor is hard, he is not adjustable of mechanical and electrical properties, that is to say, his speed and torque along with the change of load is not big, but to prevent the loss caused by the speed, must have protection circuit.
He is excited to have another power supply excitation coil (stator coil) Series of excited, stator coils with armature coils And excitation, the stator coil is in parallel with the armature coil
