Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1996-07-26
1999-03-16
Cabeca, John W.
Electricity: motive power systems
Induction motor systems
Primary circuit control
318772, 318779, H02J 314
Patent
active
058834885
ABSTRACT:
A multi-speed switching device particularly suitable for providing multi-speed starts for a motor, especially a two-speed motor, is provided with a high-reliability solid state switch for controlling a phased start winding of the motor, and an inexpensive switch for accommodating a lesser number of starts at an auxiliary speed. The high-reliability switch is a triac switched off during every motor start as the motor comes up to an operating speed. The inexpensive switch is an electromechanical relay that switches between a main run winding and an auxiliary speed run winding, and which is energized by voltage appearing across the solid state switch when it is switched off. Operation at the main speed is selected by energizing a first circuit terminal, while operation at the auxiliary speed is selected by energizing a second circuit terminal, the switch of the relay normally connecting the second circuit terminal to the main run winding when the relay coil is not energized and to the auxiliary run winding when the relay coil is energized. The switch contacts of the relay are not energized except when the motor is started for auxiliary speed operation, which thereby enhances the reliability of the relay. Because a relay is used instead of a centrifugal switch, reliability is further enhanced. The device and its method of operation are adapatable to motors having more than two speeds, with minor modifications and extensions.
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Cabeca John W.
Emerson Electric Co.
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