A three-phase synchronous motor with a non-salient (cylindrical) rotor. The rotor is a smooth cylinder carrying a distributed field winding, so the air gap is uniform and the permeance is the same along every axis — there is no reluctance torque, and the torque comes solely from the excitation. This construction is mechanically strong and suited to high speeds, so it is used for fast machines with few poles (turbo generators, high-speed drives). The motor runs exactly at the synchronous speed set by the supply frequency. The model shows the torque M, the field current and whether it is in synchronism.
This page is a utility for simulating non-salient (cylindrical) rotor synchronous motor (3-phase) online with specified initial values.
Using the model. Start the motor with the three stator switches — the damper winding runs it up and it pulls into step. Use the field rheostat to control the rotor current and power factor; unlike the salient-pole machine, without excitation the synchronising torque disappears. The speed changes only with the "supply frequency" slider. The "load torque" slider sets the load. Scopes: stator current I(stator), field current I(field) and voltage U(L1‑L2).
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