Electricity: motive power systems – Reciprocating or oscillating motor – Energizing winding circuit control
Patent
1976-07-22
1978-06-13
Schaefer, Robert K.
Electricity: motive power systems
Reciprocating or oscillating motor
Energizing winding circuit control
318254, 318439, H02K 2300
Patent
active
040951480
ABSTRACT:
A direct current motor comprises a stator having a plurality of coils connected in series with one another located around a circle in a closed loop configuration, with the junctions between adjacent pairs of coils being in turn connected to diametrically opposed ones of said junctions in said closed loop configuration. A plurality of pairs of oppositely poled silicon controlled rectifiers are connected respectively to the junctions of different adjacent pairs of the coils for conducting current from a DC source into and out of the junctions. A wound rotor energized by the DC source drives a distributor which is arranged to energize the gate electrodes of different ones of the silicon controlled rectifiers in sequence so as to produce a plurality of stator poles which, at any instant of time, are angularly displaced from the rotor poles, and which stator poles shift in position about the closed loop coil configuration with rotation of the rotor. The rotor further includes a centrifugal switch arrangement operative to achieve one mode of operation when the motor is starting and a different mode of operation when the motor is running. In one form of the invention, the stator coil junctions are energized from the DC source through brushes associated with a commutator driven by the rotor in the starting mode of operation, and the brushes are lifted from the commutator and the silicon controlled rectifiers are controlled by the distributor when the motor shifts into its running mode of operation. In a further embodiment of the invention, the commutator is eliminated and the DC supply is rapidly turned on and off during the starting mode of operation.
REFERENCES:
patent: 3286147 (1966-11-01), Parker et al.
patent: 3453512 (1969-07-01), Polakowski
patent: 3619746 (1971-11-01), Thornton
patent: 3667011 (1972-05-01), Casaday et al.
patent: 3831072 (1974-08-01), Tanikoshi
Mutter Michael
Schaefer Robert K.
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