Just posting here to see if anyone might be able to shed some light on this little headscratcher for me.
Most repulsion start induction motors still in existence today rely on a mechanical adjustment of the brush cage to reverse rotation. Moving the brush positions changes the angle of repulsion and develops torque in either one direction or the other.
One of the motors in my possession is an exception to this rule. It is an electric-reversing type repulsion start induction motor. It is wound for a single voltage. Correct brush position is at soft neutral. Four leads are exposed in the termination box. Two windings. Correct operation is achieved by connecting the two windings in series. The motor can be electrically reversed by reversing the polarity of one winding with respect to the other.
Can anyone shed some light on the theory behind this very rare and unusual arrangement?
Could it be that the second winding is simply offset from the first such that it creates an upsetting 'push' or 'pull' in the stator field with respect to the armature? I.E. moving the field in relation to the brushes rather than moving the brushes in relation to the field?
Most repulsion start induction motors still in existence today rely on a mechanical adjustment of the brush cage to reverse rotation. Moving the brush positions changes the angle of repulsion and develops torque in either one direction or the other.
One of the motors in my possession is an exception to this rule. It is an electric-reversing type repulsion start induction motor. It is wound for a single voltage. Correct brush position is at soft neutral. Four leads are exposed in the termination box. Two windings. Correct operation is achieved by connecting the two windings in series. The motor can be electrically reversed by reversing the polarity of one winding with respect to the other.
Can anyone shed some light on the theory behind this very rare and unusual arrangement?
Could it be that the second winding is simply offset from the first such that it creates an upsetting 'push' or 'pull' in the stator field with respect to the armature? I.E. moving the field in relation to the brushes rather than moving the brushes in relation to the field?
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