Moeller - Pole-changing motors

Motor circuit [t-head1-pg]


Circuit A Selection of any speed only from zero. Return only to zero.	Circuit B Selection of any speed from zero and from low speed. Return only to zero.	Circuit C Selection of any speed from zero and from low speed. Return to low speed (high braking torque) or to zero.

4 speeds [t-head3]

The 1:2 speeds - tapped windings - can follow in sequence or overlap, as the following examples show:


1st winding		500/1 000		2nd winding		1 500/3 000 = 500/1 000/1 500/3 000
or 1st winding		500/1 000		2nd winding		750/1 500 = 500/750/1 000/1 500

For motors with 3 or 4 speeds the non-connected winding has to be opened at certain pole ratios to avoid inductive circulating currents. This is achieved with additional motor terminals. A range of rotary switches is equipped with this connection (→ section Multi-Speed Switches).