Electricity: motive power systems – Automatic and/or with time-delay means – Anti-hunting
Reexamination Certificate
2005-03-15
2005-03-15
Ro, Bentsu (Department: 2837)
Electricity: motive power systems
Automatic and/or with time-delay means
Anti-hunting
C318S509000, C363S037000, C336S165000, C336S221000
Reexamination Certificate
active
06867564
ABSTRACT:
A motor drive and a choke therefor are disclosed, wherein the choke comprises a magnetic core with an inner leg and two outer legs, and four coils, which may be connected in DC current paths in the motor drive. First and second differential coils are wound around first and second outer legs, respectively; and first and second common-mode coils are wound around the inner leg of the choke. The first and second differential coils smooth the DC current on a DC bus in the motor drive, and the first and second common-mode coils suppress common-mode voltages in the motor drive. Also disclosed is a method for suppressing common-mode voltages in a motor drive.
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Stephen J. Chapman. “Electric Machinery Fundamentals”, third edition, McGraw-Hill, 1999, Chapter 1, p. 49 shows a magnetic core structure has two air gaps.*
Chenggang Mei et al., Analyzing Common-Mode Chokes For Induction Motor Drives, 2002 IEEE, 2002, pp. 1557-1562.
Bin Wu et al., An Integrated dc Link Choke For Elimination Of Motor Common-Mode Voltage In Medium Voltage Drives, 2001, IEEE, 2001 pp. 2022-2027.
Rizzo Steven C.
Wu Bin
Xiao Yuan
Zagari Navid R.
Amin & Turocy LLP
Ro Bentsu
Rockwell Automation Technologies Inc.
Walburn William R.
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