Drive circuit for a DC motor

Details Drive circuit for a DC motor Drive circuit for a DC motor

1977-10-28

1980-01-01

Rubinson, Gene Z.

Electricity: motive power systems

Series motors

Field circuit control

310181, 318532, H02K 2308

Patent

active

041818750

ABSTRACT:
A drive circuit for a DC motor provided with an armature having an armature winding and a plurality of field poles. The field poles are each composed of a main pole excited by a field winding and an auxiliary pole formed with a permanent magnet of the same polarity as the main pole. An armature current is shunted to supply a field current to the field winding connected in series to the armature. The field current remains zero until the armature current reaches a predetermined value, and increases with an increase in the armature current after the latter exceeds the predetermined value. As a result of this, in the region in which the armature current is small, that is, in the high-speed region of the motor, a torque larger than that of a DC series motor is obtained, and in the region in which the armature current is large, that is, in the low-speed region of the motor, a torque larger than that of a permanent magnet type DC motor is provided.

REFERENCES:
patent: 3378746 (1968-04-01), Weiser
patent: 3427484 (1969-02-01), Harlby et al.
patent: 3586941 (1971-06-01), Fujiwaki
patent: 4048550 (1977-09-01), Harris
patent: 4079278 (1978-03-01), Luneau

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