Original poster: "Gerry Reynolds" <gerryreynolds@xxxxxxxxxxxxx> Hi Scott,
Original poster: "Scott Hanson" <huil888@xxxxxxxxxxxx> it is just a plain old synchronous AC motor.
What is "plain old synchronous"??? Is this a third type of synchronous motor other than salient pole and hysteresis??? How is the rotor constructed on the two or three types??? The induction motor with flats ground on the rotor is certainly a salient pole motor. What are other rotor designs for the salient type???
First, an AC "synchronous" motor runs at a speed that is controlled by the frequency of the AC line current and the number of magnetic poles built into the motor's rotor/stator structure. In this context, "synchronous" means that when driven by a fixed frequency AC supply, the motor runs at a fixed speed. This is the primary characteristic of a synchronous AC motor. The motor can start and run with any of the rotor poles mechanically aligned with any of the stator poles.
This sounds like a salient pole if the position of the rotor poles is fixed wrt its shaft. One out of four positions on a four pole motor gives sufficient synchronization for a 120 (100) bps SRSG it seems. Hysteresis type (if I learned this correctly) learn their rotor pole locations at start up and their locations wrt its shaft are not fixed. Is this correct???
Gerry R.