Name two different types of ac motors?
Depending on the type of rotor used. The first is the synchronous motor, which rotates exactly at the supply frequency or a submultiple of the supply frequency. The magnetic field on the rotor is either generated by current delivered through slip rings or by a permanent magnet. The second type is the induction motor, which runs slightly slower than the supply frequency. The magnetic field on the rotor of this motor is created by an induced current.
(a) Synchronous Motors. 1. Plain 2. Super (b) Asynchronous Motors. 1. Induction Motors: (a) Squirrel Cage (b) Slip-Ring (external resistance). 2. Commutator Motors: (a) Series (b) Compensated (c) Shunt (d) Repulsion (e) Repulsion-start induction (f) Repulsion induction
Shaded pole: Very simple, fractional horse power, The fan motor in your refrigerator Permanent split phase:Two sepearte coil windings help generate a good amount of torque,( poor man's 3 phase motor} Horesepower usually under 3 H.P. Air conditioning compressors, conveyor belts Three phase induction motor:Most commercial motors: Three seperate copper coil windings. Definitely commercial due to the fact that it requires Three phase electric power. Average Horse power from 3 to 200 H.P. Very efficient motor , but you must have that three phase electric service. Fan motors , Air conditioning compressors,Pump motors and elevator motors in office buildings and commercial buildings
Between B and C, the torque is the same, and armature current is proportional to torque, so the armature current would not be expected to change very much. The speed is proportional to armature voltage, so the armature voltage would need to be reduced by about 50%. If the motor has a permanent magnet field or a field powered independently from the armature voltage, there would be very little change in armature current between B and C, but C would be a little less armature current because losses in the motor are less. If the field is connected in series or parallel with the armature, the difference would be more. A would require more current than B or C because the motor is producing twice the torque and the same or twice the speed. However, in the case of a series motor, the voltage needs to be lower for both B and C to prevent the speed from increasing when the torque is reduced. Depending on the design details, a series motor operating at half torque could require the same current due to the need to reduce the voltage so much.
Universal (brushed) and induction.
