Electricity: motive power systems – Motor structure adjustment or control – Brush or other current-collector control
Patent
1988-10-27
1990-08-14
Ro, Bentsu
Electricity: motive power systems
Motor structure adjustment or control
Brush or other current-collector control
318538, 318539, 318480, 310229, H02K 2348
Patent
active
049490230
ABSTRACT:
A direct current machine construction in which the rotor includes a permanent magnet with the stator including winding energizable from a direct current source. In a first embodiment first and second stationary slip rings are connected to an external direct current source. Coupled for rotation with the shaft are to first and second brush assemblies with brushes which are spring biased and protrude radially outwardly from the rotor shaft. The commutator for the windings is stationary relative to the housing and includes a plurality of commutator segments positioned intermediate the slip rings and in a cylindrical manner facing inwardly toward, and for contact with, the commutator brushes. The windings are on the stator with the winding leads being accessible externally of the stator for enabling switching devices to be utilized for changing of the number of turns of the stator windings for thereby varying the motor characteristics, as needed. The switching devices may be mechanical switch devices or static semiconductor switch devices. In a second embodiment, commutation is effected by non-contact position sensing devices, such as encoder wheels, optical devices and the like, operable in response to a rotating device keyed to the rotor shaft, which device is positioned for electromagnetic accuracy relative to the pole positions of the stator of the machine. With accessible external leads, the machine may be alternately used as a propulsion motor, generator or alternator in the same device for returning power to the direct current source.
REFERENCES:
patent: 2460415 (1949-02-01), Gaylord et al.
patent: 2664473 (1953-12-01), Brown
patent: 2993159 (1961-07-01), Devol
patent: 3229179 (1966-01-01), Hetzel
patent: 3242404 (1966-03-01), Favre
patent: 3419782 (1968-12-01), Sheldrake et al.
patent: 4024446 (1977-05-01), Burnett
patent: 4208601 (1980-06-01), Tardieu
patent: 4273334 (1981-06-01), Schone et al.
Astor Sanford
Ro Bentsu
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