Electricity: motive power systems – Induction motor systems – Braking
Patent
1980-07-11
1983-07-12
Smith, Jr., David
Electricity: motive power systems
Induction motor systems
Braking
318761, 310211, H02P 324
Patent
active
043933440
ABSTRACT:
A squirrel cage motor comprises a stator and a rotor, the latter having a pair of end rings and conductor bars interconnecting the end rings, the bars and rings being supported on the rotor core. At least one end ring is provided with at least two insulating gaps to divide that end ring into at least two separate portions. The rotor of the motor can be braked to stop at a predetermined position by applying to the secondary winding of the stator D.C., or A.C. of the same phase as that applied to the primary winding. A three-phase motor can similarly be arranged by providing at least three gaps in at least one end ring.
REFERENCES:
patent: 919524 (1969-04-01), Barnholdt
patent: 2434919 (1948-01-01), Girard
patent: 2828457 (1958-03-01), Noddleman
patent: 2858494 (1958-10-01), Choudharx
patent: 3391293 (1968-07-01), Purcell et al.
patent: 3678353 (1972-07-01), Marchi
patent: 3758837 (1973-09-01), Stauber et al.
patent: 4063137 (1977-12-01), Hoshimi et al.
patent: 4158225 (1979-06-01), Hertz
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