H - Electricity – 02 – K
Patent
H - Electricity
02
K
306/288, 310/42
H02K 11/00 (2006.01)
Patent
CA 1070365
ABSTRACT OF THE DISCLOSURE A motor controller having a single set of contacts and two contact operating systems is provided for operation and protection of a motor and the associated circuitry over complete range of possible currents. In a single device, corresponding to a NEMA size 1 starter, a first operator for providing a large number of operations for motor and low current overload protection operation is provided and a second operator capable of interrupting possible fault current from the low overloads up to 100,000 amperes rms is provided. For a normal motor starter operation and for fault current up to a predetermined value, such as 1200 amperes for example, an electromagnetic actuator is used to open the contacts a relatively small distance such as 1/4 inch. For higher fault currents a magnetic drive or linear slot motor opens the contacts to a greater spacing such as 1 inch. The disclosed integral motor starter utilizes a bridging contact arm on which are mounted a pair of movable contacts which are aligned to engage a pair of stationary contacts when the disclosed motor starter is closed, completing an electric circuit to the controlled motor. The current limiting magnetic drive operator rapidly opens the motor starter on potentially high destructive current overload conditions. -1-
255077
Slade Paul G.
Wafer John A.
LandOfFree
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