These have a rotor consisting of a solid steel casting with projecting (salient) toothed poles, typically less than the stator poles to minimize torque ripple and prevent the poles from all aligning simultaneously--a position which cannot generate torque.
These have a rotor. This rotor is consisting of a solid steel. This is typically. This is to minimize torque ripple and prevent the poles from all aligning simultaneously--a position. This solid steel is casting with projecting (salient) toothed poles less than the stator poles. This position cannot generate torque.