H - Electricity – 02 – P
Patent
H - Electricity
02
P
H02P 1/10 (2006.01) H01F 27/02 (2006.01) H01F 27/40 (2006.01)
Patent
CA 2051142
A motor control system includes a single, multicompart- ment enclosure mounted on a skid. The enclosure contains a transformer circuit and a motor controller circuit intercon- nected so that only external connections to a power source and a load are needed. When the circuits are energized, access to high voltage motor control components and to field replaceable fuses and output selection switches is prevented by a double interlocking mechanism which operates in con- junction with energizing and de-energizing the transformer. The transformer of the transformer circuit includes a ter- tiary winding disposed radially between a primary winding and a secondary winding. The winding filters electrostati- cally coupled transients. A conventional electrostatic shield is also used so that the transformer is doubly shielded to electrostatic transients. The tertiary winding is connected to one or more capacitors to filter magneti- cally coupled transients. A current limiting fuse, a load sensing fuse and a primary make/break switch are connected in electrical series to the primary winding. Methods for energizing or operating a motor utilizing the primary switch and the load sensing fuse are also disclosed.
Ridout & Maybee Llp
Southwest Electric Company
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