Design of Electromagnetic Interference Filters For Power Converter Applications

• US 20160004810A1
• Filed: 07/03/2014
• Published: 01/07/2016
• Est. Priority Date: 07/03/2014
• Status: Active Grant

• Current Assignee: The Boeing Co.
• Original Assignee: The Boeing Co.
• Inventors: Solodovnik, Eugene V., Karimi, Kamiar J.
• Granted Patent: US 9,977,858 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G06F 30/17 Mechanical parametric or variational design
• CPC Class Codes: H02M 1/44 Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
• CPC Class Codes: H02P 27/16 using ac to ac converters without intermediate conversion to dc H02P27/05 takes precedence
• CPC Class Codes: Y02T 10/82 Elements for improving aerodynamics

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.

Claims

1. A method to design a motor drive power system including switching mode power conversion equipment, comprising:

determining a motor drive system that includes a motor controller and a feeder that couples the motor controller to an electric motor;

determining a resonant point for the motor drive system;

shifting the resonant point for the motor drive system to a shifted resonant point that is at a higher frequency as compared to a frequency associated with the resonant point; and

designing an EMI filter for the shifted resonance point that is included in the motor drive system.

2. The method of claim 1, wherein shifting the resonant point comprises using an impedance specification of the motor controller, the feeder or the electric motor or a combination thereof to shift the resonant point.

3. The method of claim 1, further comprising optimizing the EMI filter by using shielding for the feeder or adding light passives along the feeder or a combination thereof.

4. The method of claim 1, further comprising selecting an interleaved power controller or an active EMI noise cancellation mechanism in response to determining that a weight of the motor drive system does not meet specified conditions that includes the EMI filter designed for the shifted resonant point.

5. The method of claim 1, further comprising changing an interleaving angle that reduces harmonics used in the motor drive system that includes a plurality of motor controllers.

6. The method of claim 1, further selecting an active EMI noise cancellation mechanism for the motor drive system using a weight of the motor drive system.

7. The method of claim 6, wherein the active EMI noise cancellation mechanism performs noise injection, converter paralleling or a combination thereof.

8. The method of claim 1, wherein determining the resonant point comprises measuring a combined impedance of the feeder and the electric motor in a conducted EMI frequency range.

9. The method of claim 1, further comprising dynamically determining an interleaving angle and using an interleaving angle controller to adjust the interleaving angle for the motor controller.

10. A system, comprising:

one or more motor controllers;

one or more feeders coupled to the one or more motor controllers designed using an impedance specification that moves a resonant point of a combined impedance of the one or more feeders and one or more electric motors that are coupled to the one or more feeders 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 that is designed based for the shifted resonant point.

11. The system of claim 10, wherein the one or more feeders comprise shielding, light passives or a combination thereof, added along a portion of a length of the one or more feeders.

12. The system of claim 10, wherein at least one of the one or more motor controllers is a multifunctional motor controller.

13. The system of claim 10, further comprising an interleaving angle controller coupled to the one or more motor controllers to adjust an interleaving angle.

14. The system of claim 13, wherein the interleaving angle controller adjusts the interleaving angle in response to a change of modes of the motor controller.

15. The system of claim 10, wherein the one or more controllers, the one or more feeders, the one or more electric motors and the one or more EMI filters are located on an airplane.

16. A computer-readable storage medium having computer-executable instructions stored thereon that, when executed by a computer, cause the computer to,

access a motor drive system specification that includes a motor controller model and a feeder model;

determine a resonant point for the motor drive system;

determine impedance specifications to shift the resonant point for the motor drive system to a shifted resonant point at a higher frequency as compared to a frequency of the resonant point; and

design an electromagnetic interference (EMI) filter for the shifted resonant point.

17. The computer-readable storage medium of claim 16, wherein the motor drive system is for an airplane.

18. The computer-readable storage medium of claim 16, wherein the instructions cause the computer to determine an interleaving angle that is used in the motor drive system that includes a plurality of motor controllers.

19. The computer-readable storage medium of claim 16, wherein the instructions cause the computer to determine use of active EMI noise cancellation in the motor drive system that performs noise injection, converter paralleling or a combination thereof.

20. The computer-readable storage medium of claim 16, wherein the instructions cause the computer to determine a combined impedance of a feeder and a motor in a conducted EMI frequency range and determine resonant points.