Control system for a tertiary winding self-excited generator
First Claim
1. In a traction vehicle including electric traction motor means for propelling the vehicle, electrical generating means having main windings including a field winding for supplying electrical energy to said motor means, and thermal prime mover means for driving said generating means at a variable speed, an electrical propulsion control system adapted to regulate the electrical output of said generating means, said control system comprising:
- (a) an auxiliary winding wound on said generating means for providing additional electrical energy;
(b) first means for interconnecting said auxiliary winding and said field winding, said first means including means for regulating the level of excitation supplied to said field winding from said auxiliary winding;
(c) a controllable secondary source of direct current power;
(d) second means for interconnecting said secondary source in circuit with said field winding for providing continuously controlled additional excitation when the available electrical energy from said auxiliary winding is less than a predetermined magnitude; and
(e) control means for controlling said first and second means such that the excitation supplied to said field winding comprises a first component supplied from said auxiliary winding and a second component supplied from said secondary source, said second component having an average magnitude substantially equal to the difference between the desired magnitude of field excitation and the maximum average magnitude of excitation available from said auxiliary winding.
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Abstract
A control system for a self-excited alternator which includes an auxiliary winding adapted to supply excitation to the alternator field winding incorporates a circuit for supplementing field excitation when the available energy from the auxiliary winding is less than the desired magnitude of field excitation. The self-exciting a-c current from the auxiliary winding is coupled through a phase-controlled rectifier circuit to the alternator field winding. A secondary excitation source such as a battery is coupled to the alternator field winding through a chopper circuit. A regulating circuit is responsive to a field current reference signal for controlling the conduction of the phase controlled rectifier circuit and the chopper circuit in a manner to regulate the alternator field excitation to the desired value. The regulating circuit is adapted to supplement the excitation supplied by the auxiliary winding with excitation from the secondary source until the excitation available from the auxiliary winding is sufficient to supply the desired magnitude of alternator field excitation.
46 Citations
9 Claims
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1. In a traction vehicle including electric traction motor means for propelling the vehicle, electrical generating means having main windings including a field winding for supplying electrical energy to said motor means, and thermal prime mover means for driving said generating means at a variable speed, an electrical propulsion control system adapted to regulate the electrical output of said generating means, said control system comprising:
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(a) an auxiliary winding wound on said generating means for providing additional electrical energy; (b) first means for interconnecting said auxiliary winding and said field winding, said first means including means for regulating the level of excitation supplied to said field winding from said auxiliary winding; (c) a controllable secondary source of direct current power; (d) second means for interconnecting said secondary source in circuit with said field winding for providing continuously controlled additional excitation when the available electrical energy from said auxiliary winding is less than a predetermined magnitude; and (e) control means for controlling said first and second means such that the excitation supplied to said field winding comprises a first component supplied from said auxiliary winding and a second component supplied from said secondary source, said second component having an average magnitude substantially equal to the difference between the desired magnitude of field excitation and the maximum average magnitude of excitation available from said auxiliary winding. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification