THREE-PHASE BRUSHLESS MOTOR STATE IDENTIFICATION
First Claim
1. A method for determining the state of a brushless motor having first, second and third phases, comprising:
- decoupling said motor from a power source;
determining whether said motor is rotating or non-rotating;
if the motor is rotating, determining a first phase voltage state relative to a common voltage and a second phase voltage state relative to the common voltage, said first phase and second phase voltage states determined when a third phase voltage is within a predetermined range of said common voltage; and
if the first phase voltage state and the second phase voltage state are the same, repeating said determination as to whether the motor is rotating or non-rotating.
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Accused Products
Abstract
A method for determining the state of a brushless motor having first, second and third phases, in some embodiments, comprises: decoupling said motor from a power source; determining whether said motor is rotating or non-rotating; if the motor is rotating, determining a first phase voltage state relative to a common voltage and a second phase voltage state relative to the common voltage, said first phase and second phase voltage states determined when a third phase voltage is within a predetermined range of said common voltage; and if the first phase voltage state and the second phase voltage state are the same, repeating said determination as to whether the motor is rotating or non-rotating.
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Citations
20 Claims
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1. A method for determining the state of a brushless motor having first, second and third phases, comprising:
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decoupling said motor from a power source; determining whether said motor is rotating or non-rotating; if the motor is rotating, determining a first phase voltage state relative to a common voltage and a second phase voltage state relative to the common voltage, said first phase and second phase voltage states determined when a third phase voltage is within a predetermined range of said common voltage; and if the first phase voltage state and the second phase voltage state are the same, repeating said determination as to whether the motor is rotating or non-rotating. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for determining the state of a brushless motor having first, second and third phases, comprising:
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determining whether said motor is rotating or non-rotating; if the motor is rotating, determining a first phase voltage state relative to a common voltage and a second phase voltage state relative to the common voltage, said first phase and second phase voltage states determined when a third phase voltage is approximately equal to said common voltage; and if the first phase voltage state and the second phase voltage state are the same, repeating said determination of the first phase voltage state and the second phase voltage state. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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18. A system for determining the state of a motor, comprising:
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a motor that is associated with first, second and third phases and that is driven by a motor driving circuit; a control circuit that couples to and controls the motor driving circuit; a first comparator that receives a first biased version of a common voltage at one input and a first phase voltage, a second phase voltage, or a third phase voltage at another input, an output of said first comparator provided to the control circuit; and a second comparator that receives a second biased version of a common voltage at one input and the first phase voltage, the second phase voltage, or the third phase voltage at another input, an output of said second comparator provided to the control circuit; wherein, if the outputs of the first and second comparators are both positive or are both negative, the control circuit determines that the motor is rotating, wherein, if the motor is determined to be rotating, the control circuit determines a first phase voltage state relative to the common voltage and a second phase voltage state relative to the common voltage, said first phase and second phase voltage states determined when a third phase voltage is approximately equal to said common voltage, and wherein, if the first phase voltage state and the second phase voltage state are the same, the control circuit repeats said determination of the first phase voltage state and the second phase voltage state. - View Dependent Claims (19, 20)
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Specification