Hybrid air/magnetic core inductor

A technology of inductors and magnetic cores, applied in the field of inductors, to achieve the effects of reducing skin and proximity effect losses, improving net inductance, low winding cost and/or loss

Active Publication Date: 2006-08-02
EATON POWER QUALITY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Losses are often beyond acceptable levels, and the return flux path (through the surrounding air) may adversely affect nearby items
Escaping radiated fields may increase EMI levels, and adjacent sensitive electronic circuits may in turn respond adversely to this EMI

Method used

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  • Hybrid air/magnetic core inductor
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Examples

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Embodiment Construction

[0017] Specific exemplary embodiments of the present invention will now be described with reference to the accompanying drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be fully, thoroughly, and fully express the scope of the invention. In the drawings, the same reference numerals denote the same elements. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may be present.

[0018] In some embodiments of the invention, the inductor includes a core of magnetic material such as ferrite or powdered iron. The coil is wound around the core in a solenoid configuration and is spaced from the core by a gap sufficient to allow a coolant, such as air, to circulate along the l...

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Abstract

An inductor includes an elongate magnetic core, a coil wrapped around the core and a spacer that separates the coil from the core to provide a coolant passage between the coil and the core. The coolant passage may include an air passage that extends substantially parallel to an axis of the core and that has first and second openings proximate respective first and second ends of the core. The coil may include a twisted bundle of individually insulated conductors. The inductor may be housed in a flux-tolerant compartment, i.e., a conductive aluminum structure that supports eddy currents with relatively acceptable resistive losses.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to US Provisional Application 60 / 482,806, filed June 27, 2003, the disclosure of which is incorporated herein by reference in its entirety. technical field [0003] The present invention relates to electromagnetic devices, and more particularly to inductors. Background technique [0004] High power converter applications, such as PWM based uninterruptible power supplies (UPS), may require low inductance / high current inductors for power conversion circuits such as rectifiers and inverters. In such applications, it may be desirable to maintain an effective inductance up to 3 times the rms rated current. The operating current may include both 50 / 60Hz power components and high-frequency pulsating currents. [0005] Conventional inductor designs include closed magnetic path and gapped (split and spread) core designs. Toroidal designs may require complex winding designs, and core heat may ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F27/08
Inventor G·W·小奥顿L·W·曾L·V·莱纳姆
Owner EATON POWER QUALITY CORP
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