Series speed manipulation for dual fan module
First Claim
1. A method of controlling speed of motors of a dual fan engine cooling module, the method including:
- providing a dual fan engine-cooling module having first and second motors, each motor being constructed and arranged to drive a fan, ensuring that the motors can be selectively connected
1) in series to provide a first speed of operation of each motor, with an output of the first motor being electrically connected with an input of the second motor by wire, and
2) in parallel to provide a second speed of operation of each motor, the second speed of operation being greater than the first speed of operation, and manipulating a resistance of said wire to adjust a voltage that passes through each motor to control the first speed of each motor when the motors are connected in series.
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Accused Products
Abstract
A method is provided for controlling speed of motors of a dual fan engine-cooling module. The method provides a dual fan engine cooling module 10 having first and second motors, 12 and 14, respectively. Each motor is constructed and arranged to drive a fan 13. The method ensures that the motors can be selectively connected 1) in series to provide a first speed of operation of each motor, with an output of the first motor being electrically connected with an input of the second motor by wire 20, 22, and 2) in parallel to provide a second speed of operation of each motor, the second speed of operation being greater than the first speed of operation. A resistance of the wire 20, 22 is manipulated to adjust a voltage that passes through each motor to control the first speed of each motor when the motors are connected in series.
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Citations
15 Claims
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1. A method of controlling speed of motors of a dual fan engine cooling module, the method including:
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providing a dual fan engine-cooling module having first and second motors, each motor being constructed and arranged to drive a fan, ensuring that the motors can be selectively connected
1) in series to provide a first speed of operation of each motor, with an output of the first motor being electrically connected with an input of the second motor by wire, and
2) in parallel to provide a second speed of operation of each motor, the second speed of operation being greater than the first speed of operation, andmanipulating a resistance of said wire to adjust a voltage that passes through each motor to control the first speed of each motor when the motors are connected in series. - View Dependent Claims (2, 3, 4, 5)
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6. A dual fan engine cooling module comprising:
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first and second motors, each motor being constructed and arranged to drive a fan, a switching arrangement constructed and arranged to ensure that the motors can be selectively connected
1) in series to provide a first speed of operation of each motor, and
2) in parallel to provide a second speed of operation of each motor, the second speed of operation being greater than the first speed of operation, andwire electrically connecting an output of the first motor with an input of the second motor when the motors are connected in series, a resistance of the wire contributing to define a voltage that passes through each motor to control the first speed of each motor when the motors are connected in series, wherein the voltage that passes through the first motor is V1=Vapplied·
R1/(R1+R2+R3), wherein the voltage that passes through the second motor is V2=Vapplied·
R2/(R1+R2+R3), where Vapplied is an operating voltage applied to the motor by a power source, R1 is the internal resistance of the first motor, R2 is the internal resistance of the second motor, and R3 is the resistance of said wire, the wire being constructed and arranged to define R3 due to one of a material, a gauge, and a length of said wire so as to provide a certain resistance value of R3 less than a value of R1 and a value of R2. - View Dependent Claims (7, 8, 9, 10)
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11. A dual fan engine cooling module comprising:
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first and second motors, each motor being constructed and arranged to drive a fan, means for ensuring that the motors can be selectively connected
1) in series to provide a first speed of operation of each motor, and
2) in parallel to provide a second speed of operation of each motor, the second speed of operation being greater than the first speed of operation, andwire means for electrically connecting an output of the first motor with an input of the second motor when the motors are connected in series, a resistance of the wire means contributing to define a voltage that passes through each motor to control the first speed of each motor when the motors are connected in series, wherein the voltage that passes through the first motor is V1=Vapplied·
R1/(R1+R2+R3), wherein the voltage that passes through the second motor is V2=Vapplied·
R2/(R1+R2+R3), where Vapplied is an operating voltage applied to the motor by a power source, R1 is the internal resistance of the first motor, R2 is the internal resistance of the second motor, and R3 is the resistance of said wire means, the wire means being constructed and arranged to define R3 due to one of a material, a gauge, and a length of said wire means so as to provide a certain resistance value of R3 less than a value of R1 and a value of R2. - View Dependent Claims (12, 13, 14, 15)
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Specification