Compound dc electrical motor with shunt field...

Details Compound dc electrical motor with shunt field... Compound dc electrical motor with shunt field...

H - Electricity

02

P

318/118

H02P 7/00 (2006.01) H02K 11/04 (2006.01) H02K 23/10 (2006.01) H02P 1/18 (2006.01)

Patent

CA 1056903

Abstract of the Disclosure 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 deteriora- tion, and commutation problems are reduced.

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