Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1982-04-30
1984-01-10
Smith, Jr., David
Electricity: motive power systems
Induction motor systems
Primary circuit control
H02P 132, H02P 528
Patent
active
044255390
ABSTRACT:
A control system is disclosed for connecting the primary windings of a three-phase AC inducton motor in a delta-connection at heavy loads and for automatically reconnecting the windings in a wye-connection at light loads to effect energy savings. Power sensing means produces a control signal which is directly proportional to the power applied to the induction motor. Differential comparator means respond to the control signal and to an adjustable reference signal, representing a preselected power input level, for generating an actuating signal for switching a wye-delta starter between two conditions, one of which effects the wye connection and the other the delta connection. When the power input is below the preselected level the wye-connection is established, whereas the delta-connection is made when the power input is above the preselected level.
REFERENCES:
patent: 1902444 (1933-03-01), Hobart et al.
patent: 2106833 (1938-02-01), Eames
patent: 2709775 (1955-05-01), Delcarlo
patent: 3509824 (1970-05-01), Schmidly, Jr.
patent: 3764872 (1973-10-01), Boice
patent: 3863741 (1975-02-01), Mhsuishi
patent: 3931559 (1976-01-01), McKee
patent: 4084406 (1978-04-01), Brenneman
patent: 4220440 (1980-09-01), Taylor et al.
Borg-Warner Corporation
Smith Jr. David
Tracy James E.
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