Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1984-09-07
1986-11-18
Smith, Jr., David
Electricity: motive power systems
Induction motor systems
Primary circuit control
318786, H02P 142
Patent
active
046238298
ABSTRACT:
A multiple speed motor includes first and second speed windings connected to first and second power terminals and a start winding connected to a common power terminal. A Triac connects one speed winding to power and has a gate. Either the first or second power terminal is connected to one side of a power supply and the third or common terminal is connected to the second side of the power supply. The gate is connected to the start winding. A speed responsive switch has first and second contacts connected to first and second power terminals and third connected to a common node the connection between the start winding and the gate. The speed responsive switch has a first position which all contacts are engaged to simultaneously energize the first speed winding and the start winding independent of which of power terminals is connected to the power supply and at a selected speed operates to open all contacts whereby the first and second power terminals are disconnected from each other and from said common connection of the gate and start winding. With power at the first power terminal the first speed winding is energized to establish a first speed mode of operation with power at the second power terminal. The second speed winding is energized to establish a second speed mode.
REFERENCES:
patent: 2564633 (1951-08-01), Ziegler
patent: 2579066 (1951-12-01), Codling
patent: 4066937 (1978-01-01), Pfarrer et al.
patent: 4443749 (1984-04-01), Douthart et al.
patent: 4467257 (1984-08-01), Douthart et al.
Douthart Robert H.
Smith Howard W.
A. O. Smith Corporation
Smith Jr. David
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