Title:
D.C. REACTOR
Document Type and Number:
WIPO Patent Application WO/1996/018198
Kind Code:
A1
Abstract:
A D.C. reactor comprising a core structure having two opposed cores separated by a magnetic gap, to form a closed magnetic circuit; a coil wound on one or both of the cores; a pair of permanent magnets for biasing, disposed on the core structure; magnetic flux generation means for causing the bias flux generated by the permanent magnets and the flux generated by the coils to flow in opposite directions; and bypass means for causing the bias flux generated by the permanent magnets to bypass the magnetic gap. The core structure comprises an E-shaped core and an I-shaped core, the magnetic gap is defined between a center leg of the E-shaped core and the I-shaped core, the coil is wound on the center leg of the E-shaped core, and each permanent magnet is shaped into a rectangle and disposed on both side surfaces of the center leg of the E-shaped core. The permanent magnet is a sheet-like permanent magnet magnetized so that each of its longitudinal direction and the direction of thickness forms two poles on each side, and the neutral line of this permanent magnet is brought into conformity with the center line of the magnetic gap and is disposed on both outer side surfaces of the core structure. Since the flux generated by the D.C. reactor does not pass inside the permanent magnet, an eddy current loss decreases, and even when a large current abruptly flows through the coil, the permanent magnet is not demagnetized.
Inventors:
TOMINAGA RYUICHIROU (JP)
IWABUCHI NORIAKI (JP)
ZENKE MICHIHIKO (JP)
IWABUCHI NORIAKI (JP)
ZENKE MICHIHIKO (JP)
Application Number:
PCT/JP1995/002508
Publication Date:
June 13, 1996
Filing Date:
December 07, 1995
Export Citation:
Assignee:
YASKAWA DENKI SEISAKUSHO KK (JP)
TOMINAGA RYUICHIROU (JP)
IWABUCHI NORIAKI (JP)
ZENKE MICHIHIKO (JP)
TOMINAGA RYUICHIROU (JP)
IWABUCHI NORIAKI (JP)
ZENKE MICHIHIKO (JP)
International Classes:
H01F29/14; H01F37/00; H01F27/24; (IPC1-7): H01F27/24; H01F37/00
Foreign References:
| JPS54152957U | 1979-10-24 | |||
| JPS5796512A | 1982-06-15 | |||
| JPS4637128B1 | 1971-11-01 |
Other References:
See also references of EP 0744757A4
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