Electromagnetic interference filters for power converter applications
First Claim
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1. A computer-based method to design a motor drive system including switching mode power conversion equipment, the method comprising:
- selecting a software model representing a first configuration of the motor drive system, the first configuration comprising a motor controller, a feeder that couples the motor controller to an electric motor, and a first filter configuration of an electromagnetic interference (EMI) filter;
determining a first weight value of a weight associated with the motor drive system if manufactured according to the first configuration;
performing, on one or more computer processors, a simulation using the software model to determine a first resonant point for the first configuration of the motor drive system;
selecting, upon determining that the first weight value does not meet a predefined weight requirement, a shifted resonant point that is at a higher frequency as compared to a frequency associated with the first resonant point;
updating the software model to represent a second configuration of the motor drive system, wherein the second configuration of the motor drive system comprises a second filter configuration of the EMI filter that is selected such that the second configuration of the motor drive system corresponds to the shifted resonant point;
determining a second weight value of the weight associated with the motor drive system if manufactured according to the second configuration; and
manufacturing, upon determining that the second weight value meets the predefined weight requirement, the motor drive system according to the second configuration using the updated software model.
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Abstract
Methods, computer-readable storage mediums and systems provide for designing a motor drive power system including switching mode power conversion equipment. According to aspects of the disclosure, a resonant point is shifted to a shifted resonant point by changing impedance of at least one of a feeder or a motor. An EMI filter is designed for the shifted resonant point that is at a higher frequency such that the EMI filter for the shifted resonant point is lighter as compared to an EMI filter designed for the resonant point before it is shifted.
11 Citations
20 Claims
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1. A computer-based method to design a motor drive system including switching mode power conversion equipment, the method comprising:
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selecting a software model representing a first configuration of the motor drive system, the first configuration comprising a motor controller, a feeder that couples the motor controller to an electric motor, and a first filter configuration of an electromagnetic interference (EMI) filter; determining a first weight value of a weight associated with the motor drive system if manufactured according to the first configuration; performing, on one or more computer processors, a simulation using the software model to determine a first resonant point for the first configuration of the motor drive system; selecting, upon determining that the first weight value does not meet a predefined weight requirement, a shifted resonant point that is at a higher frequency as compared to a frequency associated with the first resonant point; updating the software model to represent a second configuration of the motor drive system, wherein the second configuration of the motor drive system comprises a second filter configuration of the EMI filter that is selected such that the second configuration of the motor drive system corresponds to the shifted resonant point; determining a second weight value of the weight associated with the motor drive system if manufactured according to the second configuration; and manufacturing, upon determining that the second weight value meets the predefined weight requirement, the motor drive system according to the second configuration using the updated software model. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A motor drive system for coupling to one or more electric motors, the motor drive system comprising:
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one or more motor controllers; one or more feeders coupled to the one or more motor controllers and to the one or more electric motors, wherein the one or more feeders are designed using an impedance specification that moves a resonant point of a combined impedance of the one or more feeders and the one or more electric motors to a shifted resonant point at a higher frequency as compared to a frequency of the resonant point; and one or more electromagnetic interference (EMI) filters that are coupled to the one or more motor controllers, wherein the one or more EMI filters are designed based for the shifted resonant point by; determining a first weight value of a weight associated with the motor drive system if manufactured according to a first EMI filter configuration; determining that the first weight value does not meet a predefined weight requirement; determining a second weight value of the weight associated with the motor drive system if manufactured according to a second EMI filter configuration that corresponds to the shifted resonant point; and manufacturing, upon determining that the second weight value meets the predefined weight requirement, the motor drive system according to the second EMI filter configuration. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A computer-readable storage medium having computer-executable instructions stored thereon that, when executed by a computer, cause the computer to:
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access a specification for a motor drive system that includes a motor controller model and a feeder model; determine, using the motor controller model and the feeder model, a first resonant point for a first configuration of the motor drive system; determine a first weight value of a weight associated with the motor drive system if manufactured according to the first configuration; determine that the first weight value does not meet a predefined weight requirement; determine impedance specifications to shift a resonant point for the motor drive system to a shifted resonant point at a higher frequency as compared to a frequency of the first resonant point; determine a second configuration of the motor drive system, wherein the second configuration comprises an electromagnetic interference (EMI) filter having a filter configuration selected such that the second configuration of the motor drive system corresponds to the shifted resonant point; determine a second weight value of the weight associated with the motor drive system if manufactured according to the second configuration; and manufacture, upon determining that the second weight value meets the predefined weight requirement, the motor drive system according to the second configuration. - View Dependent Claims (17, 18, 19, 20)
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Specification