Permanent magnetic core device

Details Permanent magnetic core device Permanent magnetic core device

2005-04-26

2005-04-26

Nguyen, Tuyen T (Department: 2832)

Inductor devices

With permanent magnet

C336S178000

Reexamination Certificate

active

06885272

ABSTRACT:
Biased core devices and method of use are disclosed in which magnetic core energy losses due to hysteresis and eddy currents are greatly reduced in comparison to the core losses in prior art transformers and inductive devices. The present invention sets forth a transformer or choke device in which permanent magnets are surrounded by electrical steel materials and may be held in place by pole pieces. The magnetic core transformer structure also permits a method of use in which current passing through the device is controlled by the field strength of the permanent magnets. In addition, the biased magnetic core transformer operation may be linear or non-linear, and placed in series or parallel within a circuit. The magnetic components disclosed in the present invention affords both energy loss reductions and size reductions in comparison to known prior art transformers. The invention has many applications, including, but not limited to, the protection of switch gear, current limiting, voltage transformation in power distribution and for current control in arc discharge lamp circuits.

REFERENCES:
patent: 4675615 (1987-06-01), Bramanti
patent: 5821844 (1998-10-01), Tominaga et al.
patent: 5926083 (1999-07-01), Asaoka

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