Plural motor fan system with improved speed control
First Claim
1. A two motor assembly for driving two fan blades to move air through a heat exchanger for an automotive engine comprising:
- a first two speed DC motor comprisingmeans for establishing a first fixed magnetic motor field;
armature rotor means rotatable to drive a first fan blade;
a multiplicity of armature coil turns on said armature rotor means;
commutator means on said armature rotor means electrically connected with said multiplicity of armature coil turns and;
brush means including tap brush means cooperating with said commutator means to alternatively operate said first two speed DC motor (1) in a first speed mode wherein (A) a system voltage is applied and distributed across all of said multiplicity of armature coil turns to produce a net total back electro-motive force (EMF) and armature reaction interacting with said first magnetic field to cause said armature rotor means to rotate in said first speed mode and (B) a tap voltage intermediate the system voltage reduced across a predetermined number of armature coil turns less than all of the multiplicity of armature coil turns is provided through said tap brush means and (2) a different second speed mode;
a second DC motor including rotor means for driving a second fan blade and cooperating field means and armature coil means for rotating said rotor means;
and means for alternatively (1) applying said tap voltage across the armature coil means of said second DC motor so as to operate said second DC motor in a first speed mode when said first two speed DC motor is operated in the first speed mode thereof and (2) applying a system voltage across the armature coil means of said second DC motor so as to operate said second DC motor in a second speed mode when said first two speed DC motor is operated in said second speed mode.
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0 Petitions
Accused Products
Abstract
A two motor assembly for driving two fan blades to move air through a heat exchanger comprising a first two speed DC motor comprising magnets for establishing a fixed magnetic field, an armature rotor rotatable to drive a first fan blade, a multiplicity of armature coil turns on the armature rotor, a commutator assembly on the armature rotor, and sets of brushes including a tap brush cooperating with the commutator assembly to alternatively operate the two speed DC motor (1) is a first speed mode wherein (A) a system voltage is applied and distributed across all of the multiplicity of armature coil turns to produce a net total back EMF and armature reaction interacting with the magnetic field to cause the armature rotor to rotate in the first speed mode and (B) a tap voltage intermediate the system voltage reduced across a predetermined number of armature coil turns less than all of the multiplicity of armature coil turns is provided through the tap brush and (2) a different second speed mode. Circuitry is provided for alternatively (1) applying the tap voltage across the armature coil of a second DC motor so as to operate the second DC motor in a first speed mode when said first two speed DC motor is operated in the first speed mode thereof and (2) applying the system voltage across the armature coil of the second DC motor so as to operate the second DC motor in a second speed mode when the first two speed DC motor is operated in the second speed mode.
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Citations
20 Claims
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1. A two motor assembly for driving two fan blades to move air through a heat exchanger for an automotive engine comprising:
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a first two speed DC motor comprising means for establishing a first fixed magnetic motor field; armature rotor means rotatable to drive a first fan blade; a multiplicity of armature coil turns on said armature rotor means; commutator means on said armature rotor means electrically connected with said multiplicity of armature coil turns and; brush means including tap brush means cooperating with said commutator means to alternatively operate said first two speed DC motor (1) in a first speed mode wherein (A) a system voltage is applied and distributed across all of said multiplicity of armature coil turns to produce a net total back electro-motive force (EMF) and armature reaction interacting with said first magnetic field to cause said armature rotor means to rotate in said first speed mode and (B) a tap voltage intermediate the system voltage reduced across a predetermined number of armature coil turns less than all of the multiplicity of armature coil turns is provided through said tap brush means and (2) a different second speed mode; a second DC motor including rotor means for driving a second fan blade and cooperating field means and armature coil means for rotating said rotor means; and means for alternatively (1) applying said tap voltage across the armature coil means of said second DC motor so as to operate said second DC motor in a first speed mode when said first two speed DC motor is operated in the first speed mode thereof and (2) applying a system voltage across the armature coil means of said second DC motor so as to operate said second DC motor in a second speed mode when said first two speed DC motor is operated in said second speed mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A fan system for use in moving air through a heat exchanger for an automotive engine comprising
shroud means adapted to be operatively associated with the heat exchanger so as to receive air after it has passed through the heat exchanger, said shroud means having air discharge opening means therein for allowing air received therein which has passed through the heat exchanger to be discharged therefrom, separate first and second fan blade means mounted for separate rotational movement within said shroud means to cause air to flow into the shroud means through the heat exchanger and to flow out of the shroud means through the discharge opening means thereof, a first two speed DC motor having armature rotor means rotatable to drive said first fan blade means, said first motor comprising means for establishing a first fixed magnetic field; -
a multiplicity of armature coil turns on said armature rotor means; commutator means on said armature rotor means electrically connected with said multiplicity of armature coil turns and; brush means including tap brush means cooperating with said commutator means to alternatively operate said first two speed DC motor (1) in a first speed mode wherein (A) a system voltage is applied and distributed across all of said multiplicity of armature coil turns to produce a net total back electro-motive force and armature reaction interacting with said first magnetic field to cause said armature rotor means to rotate in said first speed mode and (B) a tap voltage intermediate the system voltage reduced across a predetermined number of armature coil turns less than the entire multiplicity of armature coil turns is produced through said tap brush means and (2) a different second speed mode; a second DC motor including rotor means rotatable to drive said second fan blade means and cooperating field means and armature coil means for rotating said rotor means; and means for alternatively (1) applying said tap voltage across the armature coil means of said second DC motor so as to operate said second DC motor in a first speed mode when said first two speed DC motor is operated in the first speed mode thereof and (2) applying a system voltage across the armature coil means of said second DC motor so as to operate said second DC motor in a second speed mode when said first two speed DC motor is operated in said second speed mode. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification