Compound D.C. electrical motor with shunt field demagnetization

Details Compound D.C. electrical motor with shunt field demagnetization Compound D.C. electrical motor with shunt field demagnetization

1976-02-09

1978-03-21

Dobeck, B.

Electricity: motive power systems

Field or secondary circuit control

Plural, diverse or diversely connected or controlled field...

318356, 318532, 318405, H02P 700

Patent

active

040805565

ABSTRACT:
A DC electrical motor of the form having one field winding connected in series with the armature winding in addition to a shunt field winding connected in parallel with the armature winding is provided with a diode or the like in the shunt field winding circuit. This blocks reversed current flow in the shunt field winding which can otherwise occur during start-up due to an inductive interaction with the series field winding and armature circuit. The diode or the like enables faster magnetization of the stator poles by preventing creation of negative shunt field ampere turns due to the magnetic couple with the series field-armature circuit during the motor start period. Faster starting of the motor results, and adverse effects such as heating, brush deterioration, and commutation problems are reduced.

REFERENCES:
patent: 2926295 (1960-02-01), Allen
patent: 3221234 (1965-11-01), Ault
patent: 3504256 (1970-03-01), Metcalfe
patent: 3792326 (1974-02-01), First

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