Electricity: motor control systems – Closed loop speed control system for dc motor with commutator – Field control – or field and armature control – by analog...
Patent
1994-06-17
1996-01-09
Ro, Bentsu
Electricity: motor control systems
Closed loop speed control system for dc motor with commutator
Field control, or field and armature control, by analog...
388806, 318493, H02P 5178
Patent
active
054836158
ABSTRACT:
A direct current (DC) electrical motor system includes a DC electrical motor having energy conversion armature windings conducting a first electric current, and an electromagnetic field windings conducting a second electric current. The system also includes means to maintain the magnitude of the second electric current in the electromagnetic field windings at a substantially constant ratio of the magnitude of the first electric current in the energy conversion armature windings. Thus, the magnitude of the ampere-turn strength of the electromagnetic field of the motor is substantially always a ratio of the magnitude of the electric current in the energy conversion armature winding circuit of the motor, and the DC electrical motor of this invention performs substantially the same as a conventional series wound DC electrical motor. Also included in the DC electrical motor system are means to selectively impose one or more minimum magnitudes of current below which the second current in the electromagnetic field windings cannot substantially decrease in order to limit the maximum rotational speed of the DC electrical motor of this invention. The system also includes selective means to variably control the magnitude of the second electric current in the electromagnetic field windings independently of the magnitude of the first electric current in the energy conversion armature windings in order to control the performance of the system of this invention as a DC electric generator.
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Kleinke Bernard L.
Potts Jerry R.
Ro Bentsu
Scott Peter P.
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