Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1999-03-12
2000-07-11
Masih, Karen
Electricity: motive power systems
Induction motor systems
Primary circuit control
318370, 318376, 324117, H02P 126
Patent
active
060878002
ABSTRACT:
A solid state motor starter, commonly referred to as a soft starter, is constructed in a manner to be easily manufacturable while at the same time combining all the required components in a relatively small package. A solid state power switch is clamped between a pair of bus bars in an offset manner to accommodate a discrete switching relay mounted in an inverted manner between the line input and the bus bar in communication with the load outputs. When in a motor run node, current is shunted away from the solid state power switching device and through the switching relay, a substantially linear current path is achieved to reduce power loss and heat buildup. The arrangement allows for a heat sink mounted to one of the bus bars with adequate spacing between the heat sink and the discrete relay for insertion of a cooling fan. Current sensing is achieved with a Hall effect sensor mounted to the bus bar in a small current sensing region that is created by having a pair of slots in the bus bar to direct current. A pair of magnetic pins extend perpendicular from the bus bar to create the magnetic flux for the Hall effect/sensor to sense current flow through the current sensing region. The Hall effect sensor circuit board also contains a thermistor which is mounted with adequate insulation yet in thermal communication with the bus bar.
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Becker James A.
von Eckroth Kurt
Wieloch Christopher J.
Eaton Corporation
Masih Karen
Vande Zande Larry
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