Method and apparatus for reducing noise and vibration in switched reluctance motor drives
First Claim
1. A method of reducing noise and vibration in a switched reluctance motor drive comprising:
- generating, by a computer, a phase current profile by;
initializing a plurality of profile parameters defining at least a portion of the phase current profile, the profile parameters comprising a current turn-off instant and a current turn-off profile defining the portion of the phase current profile after the current turn-off instant;
determining whether a desired torque is achieved based on operation of the switched reluctance motor drive using the plurality of profile parameters;
updating at least one of the plurality of profile parameters if the desired torque is not achieved;
initializing a radial force rate of change parameter mathematically related to the current turn-off profile;
calculating the current turn-off profile based on the radial force rate of change parameter;
determining whether the desired torque is achieved based on operation of the switched reluctance motor drive using the profile parameters, including the current turn-off profile calculated based on the radial force rate of change parameter; and
updating the radial force rate of change parameter if the desired torque is not achieved;
generating a phase current according to the phase current profile; and
applying the phase current to the switched reluctance motor drive.
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Accused Products
Abstract
According to one embodiment of the invention, a method includes generating, by a computer, a phase current profile, generating a phase current according to the phase current profile, and applying the phase current to the switched reluctance motor drive. Generating the phase current profile includes initializing one or more first profile parameters which define at least a first portion of the phase current profile. Generating the phase current profile also includes determining whether a first performance criterion is satisfied based on operation of the switched reluctance motor drive using the first profile parameters. Generating the phase current profile also includes updating at least one the first profile parameters if the first performance criterion is not satisfied.
27 Citations
57 Claims
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1. A method of reducing noise and vibration in a switched reluctance motor drive comprising:
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generating, by a computer, a phase current profile by;
initializing a plurality of profile parameters defining at least a portion of the phase current profile, the profile parameters comprising a current turn-off instant and a current turn-off profile defining the portion of the phase current profile after the current turn-off instant;
determining whether a desired torque is achieved based on operation of the switched reluctance motor drive using the plurality of profile parameters;
updating at least one of the plurality of profile parameters if the desired torque is not achieved;
initializing a radial force rate of change parameter mathematically related to the current turn-off profile;
calculating the current turn-off profile based on the radial force rate of change parameter;
determining whether the desired torque is achieved based on operation of the switched reluctance motor drive using the profile parameters, including the current turn-off profile calculated based on the radial force rate of change parameter; and
updating the radial force rate of change parameter if the desired torque is not achieved;
generating a phase current according to the phase current profile; and
applying the phase current to the switched reluctance motor drive.
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2. A method of reducing noise and vibration in a switched reluctance motor drive comprising:
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generating, by a computer, a phase current profile by;
initializing one or more first profile parameters defining at least a first portion of the phase current profile;
determining whether a first performance criterion is satisfied based on operation of the switched reluctance motor drive using the phase current profile defined at least by the one or more first profile parameters; and
updating at least one of the one or more first profile parameters if the first performance criterion is not satisfied, including automatically adjusting the at least one first profile parameter by predetermined increments;
generating a phase current according to the phase current profile; and
applying the phase current to the switched reluctance motor drive. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method of determining a phase current profile for a phase current used in a switched reluctance motor, the method comprising:
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initializing one or more first profile parameters defining at least a first portion of the phase current profile;
determining whether a first performance criterion is satisfied based on operation of the switched reluctance motor drive using the phase current profile defined at least by the one or more first profile parameters; and
updating at least one of the one or more first profile parameters if the first performance criterion is not satisfied, including automatically adjusting the at least one first profile parameter by predetermined increments. - View Dependent Claims (18, 19, 20)
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21. A switched reluctance motor system comprising:
a switched reluctance motor and a phase current applied to the switched reluctance motor, the phase current applied according to a phase current profile determined by;
initializing one or more first profile parameters defining at least a first portion of the phase current profile;
determining whether a first performance criterion is satisfied based on operation of the switched reluctance motor drive using the phase current profile defined at least by the one or more first profile parameters; and
updating at least one of the one or more first profile parameters if the first performance criterion is not satisfied, including automatically adjusting the at least one first profile parameter by predetermined increments. - View Dependent Claims (22, 23, 24)
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25. A switched reluctance motor system comprising:
a switched reluctance motor and a phase current applied to the switched reluctance motor according to a desired phase current profile, the desired phase current profile comprising a current turn-off instant defining a desired instant at which the phase current is turned-off and a current turn-off profile defining a desired decay of the magnitude of the phase current from the magnitude of the phase current at the current turn-off instant to zero, wherein the desired decay is less rapid than a natural decay of the phase current. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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36. A control system for use in a switched reluctance motor system, the control system operable to determine a phase current profile for a phase current used in switched reluctance motor, the phase current profile determined by:
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initializing one or more first profile parameters defining at least a first portion of the phase current profile;
determining whether a first performance criterion is satisfied based on operation of the switched reluctance motor drive using the phase current profile defined at least by the one or more first profile parameters; and
updating at least one of the one or more first profile parameters if the first performance criterion is not satisfied, including automatically adjusting the at least one first profile parameter by predetermined increments. - View Dependent Claims (37, 38, 39)
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- 40. A control system for use in a switched reluctance motor system, the control system operable to determine a desired phase current profile for generating a phase current used in switched reluctance motor, the desired phase current profile comprising a current turn-off instant defining a desired instant at which the phase current is turned-off and a current turn-off profile defining a desired decay of the magnitude of the phase current from the magnitude of the phase current at the current turn-off instant to zero, wherein the desired decay is less rapid than a natural decay of the phase current.
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48. A switched reluctance motor system comprising:
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a switched reluctance motor;
a neural network comprising a plurality of neurons connected by a network, each neuron having an associated weight, wherein the neural network is operable to receive one or more inputs and to output a desired phase current profile based on the inputs and the weights, the desired phase current profile comprising;
a current turn-off instant defining a desired instant at which the phase current is turned off; and
a current turn-off profile defining a desired decay of the magnitude of the phase current from the magnitude of the phase current at the current turnoff instant to zero, wherein the desired decay is less rapid than a natural decay of the phase current; and
a phase current applied to the switched reluctance motor according to a phase current profile output by the neural network. - View Dependent Claims (49, 50, 51, 52, 53, 54, 55, 56, 57)
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Specification