LOW FREQUENCY MAGNETIC CORE INDUCTOR STRUCTURE

• US 3,668,589 A
• Filed: 12/08/1970
• Issued: 06/06/1972
• Est. Priority Date: 12/08/1970
• Status: Expired due to Term

• Current Assignee: Bruce L. Wilkinson
• Original Assignee: Bruce L. Wilkinson
• Inventors: Wilkinson, Bruce L.
• Primary Examiner(s): Kozma, Thomas J.
• Application Number:
  US05/096,005
• Time in Patent Office: 546 Days
• Field of Search: 336/212,221,233,234 340/174ZB
• US Class Current: 336/212
• CPC Class Codes: H01F 2003/106 Magnetic circuits using combinations of different magnetic materials
• CPC Class Codes: H01F 27/255 made from particles H01F27/26 takes precedence

Abstract

A low frequency magnetic core inductor is provided which exhibits the desirable high quality factor (Q) and low external magnetic field of the prior art toroidal type inductor, but which is constructed to have a bobbin-like configuration for ease of assembly and winding the inductor winding on the core, and for compactness of size and efficient use of available space.

Claims

1. A magnetic inductor unit which exhibits no appreciable external magnetic field, comprising:

a first straight magnetic core section with a rod-like configuration and of a particular length and of a relatively low and uniform permeability throughout its length;

a second C-shaped magnetic core section of relatively high permeability in contact with the ends of said first core section and completing a magnetic circuit with said first magnetic core section, said second and first magnetic core sections exhibiting relative permeabilities in a ratio range of the order of 10-300 such that substantially all of the magnetomotive force developed around the aforesaid magnetic structure resides in said first magnetic core section; and

a winding positioned on saif rist magnetic core section and evenly distributed along the entire length of said first core section.

2. The magnetic inductor unit defined in claim 1, in which said first core section is composed of a magnetic material of a permeability in a range of the order of 10-300.

3. The magnetic inductor defined in claim 1, in which said second core section is composed of a magnetic material of a permeability of the order of 3,000.

4. A magnetic inductor unit which exhibits no appreciable external magnetic field, comprising:

first and second straight core sections spaced and parallel to one another, each with a rod-like configuration and each of a particular length and of relatively low and uniform permeability throughout its length;

third and fourth magnetic core sections engaging the ends of said first and second core sections and completing a magnetic circuit with said first and second magnetic core sections and of relatively high permeability, said first and second and third and fourth core sections exhibiting relative permeabilities in a ratio range of the order of 10-300, such that substantially all of the magnetomotive force developed around the aforesaid magnetic circuit resides in said first and second magnetic core sections; and

windings mounted on said first and second core sections and evenly distributed along the entire lengths thereof.