Automotive alternator designed to attenuate field current rapidly
First Claim
1. An automotive alternator comprising:
- a rotor equipped with a plurality of field magnetic poles;
a first field winding working to magnetize said field magnetic poles;
a second field winding working to magnetize said field magnetic poles, said second field winding having a time constant shorter than that of said first field winding;
an armature subjected to a rotating field produced by said rotor to generate an alternating current output;
a rectifier converting the alternating current output from said armature into a direct current output;
a controller working to regulate field currents supplied to said first and second field windings to control an output voltage of the alternator; and
a circulating circuit connected in parallel to said first and second field windings, said circulating circuit working to circulate the field currents in the event that supply of the field currents is cut by said controller.
1 Assignment
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Accused Products
Abstract
An automotive alternator is provided which includes a rectifier, a circulating circuit, and a controller. The circulating circuit is connected in parallel to a field winding to circulate the field current in the event that supply of the field current to a field winding is cut. The circulating circuit consists of a first circuit formed by a diode and a second circuit working to enhance attenuation of the field current. The controller works to select the second circuit when a voltage of the output of the rectifier exceeds a reference value and select the first circuit when the voltage of the output of the rectifier is less than the reference value.
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Citations
12 Claims
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1. An automotive alternator comprising:
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a rotor equipped with a plurality of field magnetic poles;
a first field winding working to magnetize said field magnetic poles;
a second field winding working to magnetize said field magnetic poles, said second field winding having a time constant shorter than that of said first field winding;
an armature subjected to a rotating field produced by said rotor to generate an alternating current output;
a rectifier converting the alternating current output from said armature into a direct current output;
a controller working to regulate field currents supplied to said first and second field windings to control an output voltage of the alternator; and
a circulating circuit connected in parallel to said first and second field windings, said circulating circuit working to circulate the field currents in the event that supply of the field currents is cut by said controller. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An automotive alternator comprising:
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a rotor equipped with a plurality of field magnetic poles;
a field winding supplied with a field current to magnetize said field magnetic poles;
an armature subjected to a rotating field produced by said rotor to generate an alternating current voltage;
a rectifier converting the alternating current output from said armature into a direct current output;
a circulating circuit including a first circuit formed by a diode and a second circuit equipped with a circuit element working to enhance attenuation of the field current, said circulating circuit being connected in parallel to said field winding to circulate the field current in the event that supply of the field current to said field winding is cut; and
a controller working to regulate the field current supplied to said field winding to control an output voltage of the alternator, said controller selecting the second circuit when a voltage of the output of said rectifier exceeds a reference value and selecting the first circuit when the voltage of the output of said rectifier is less than the reference value. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification