Control system and method for controlling a DC motor or generator
First Claim
1. A control system for providing DC series-type excitation to a direct current commutating machine, said machine including a rotating armature and at least one field winding connected in series with said armature, comprising:
- a first means for supplying the field winding with a primary excitation current;
a second means, connected in parallel to said first means, for providing an auxiliary excitation current of a controlled magnitude; and
a control means for allowing the auxiliary excitation current to enter the field winding when a magnetic field intensity measurement of the field winding deviates from a value corresponding to a desired magnetic field intensity, said auxiliary excitation current being combined with said primary excitation current to increase the magnetic field intensity measurement in the field winding to the desired magnetic field intensity,wherein said second means includes a subexciter circuit means containing an auxiliary power source to control an output of said auxiliary power source.
0 Assignments
0 Petitions
Accused Products
Abstract
A control system for controlling the excitation of a DC motor or generator activates an auxiliary power source to increase the magnetic field intensity in one or more field windings of the motor or generator when the intensity falls below a desired level, especially during a low voltage mode of operation. The system includes an excitation control system which generates a feedback signal for controlling a subexciter circuit included in the auxiliary power source in response to signals generated from detection elements that monitor various operational conditions of the motor or generator.
-
Citations
10 Claims
-
1. A control system for providing DC series-type excitation to a direct current commutating machine, said machine including a rotating armature and at least one field winding connected in series with said armature, comprising:
-
a first means for supplying the field winding with a primary excitation current; a second means, connected in parallel to said first means, for providing an auxiliary excitation current of a controlled magnitude; and a control means for allowing the auxiliary excitation current to enter the field winding when a magnetic field intensity measurement of the field winding deviates from a value corresponding to a desired magnetic field intensity, said auxiliary excitation current being combined with said primary excitation current to increase the magnetic field intensity measurement in the field winding to the desired magnetic field intensity, wherein said second means includes a subexciter circuit means containing an auxiliary power source to control an output of said auxiliary power source. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
Specification