Electric motor

• US 10,375,479 B2
• Filed: 10/30/2017
• Issued: 08/06/2019
• Est. Priority Date: 08/04/2015
• Status: Active Grant

• Current Assignee: Curtis E. Graber
• Original Assignee: Curtis E. Graber
• Inventors: Graber, Curtis E.
• Primary Examiner(s): Kuntz, Curtis A
• Assistant Examiner(s): Dang, Julie X
• Application Number:
  US15/797,404
• Publication Number:
  US 20180070182A1
• Time in Patent Office: 645 Days
• Field of Search: 381401, 381412, 381431, 381399, 381191, 381408, 381422, 381400, 181173, 181176, 181148, 181142
• CPC Class Codes: H04R 1/021 incorporating only one transducer
• CPC Class Codes: H04R 2209/021 Reduction of eddy currents in the magnetic circuit of electrodynamic loudspeaker transducer
• CPC Class Codes: H04R 2209/022 Aspects regarding the stray flux internal or external to the magnetic circuit, e.g. shielding, shape of magnetic circuit, flux compensation coils
• CPC Class Codes: H04R 9/025 Magnetic circuit
• CPC Class Codes: H04R 9/04 Construction, mounting, or centering of coil

Abstract

An electric motor including a driven element, a magnet assembly and a driving element. The driven element being driven in a direction of movement. The magnet assembly is includes first and second magnets each having first and second magnetic poles. The first magnetic pole of the first magnet and the first magnetic pole of the second magnet being proximate to each other and facing each other thereby defining a first magnetic zone therebetween. The first magnetic poles all being similar, and the second magnetic poles all being similar. The driving element is proximate to the magnet assembly, producing a magnetic field within the driving element that is primarily orthogonal to the direction of movement.

Claims

1. An electric motor, comprising:

a driven element having a direction of movement;

a magnet assembly coupled to the driven element, the magnet assembly including;

a first magnet having a first magnetic pole and a second magnetic pole;

a second magnet having a first magnetic pole and a second magnetic pole, the first magnetic pole of the first magnet and the first magnetic pole of the second magnet being proximate to each other and facing each other thereby defining a first magnetic zone therebetween, the first magnetic poles all being similar, and the second magnetic poles all being similar;

a first ferrous member positioned between the first magnetic pole of the first magnet and the first magnetic pole of the second magnet, the first ferrous member coupling a substantial amount of the magnetic field emanating from the first magnetic poles and directing the substantial amount of the magnetic field to a gap between the ferrous member and the at least one driving element;

a third magnet having a first magnetic pole and a second magnetic pole, the second magnetic pole being proximate to the second magnetic pole of the second magnet and facing each other thereby defining a second magnetic zone; and

a second ferrous member positioned between the second magnetic pole of the second magnet and the second magnetic pole of the third magnet; and

at least one driving element proximate to the magnet assembly, the at least one driving element producing a magnetic field that is primarily orthogonal within the at least one driving element to the direction of movement, the at least one driving element includes a first driving element and a second driving element each being proximate to the magnet assembly on opposite sides of the magnet assembly, the first driving element and the second driving element produce magnetic fields that are primarily orthogonal to the direction of movement within the at least one driving element, the magnetic fields of the first driving element and the second driving element being configured to direct the same polarity of magnetic field toward the magnet assembly.

2. The electric motor of claim 1, wherein the driving elements are electrical coils with a central void.

3. The electric motor of claim 2, wherein the central void has a width that is generally uniform across a width of the driven element.

4. The electric motor of claim 3, wherein the second magnet has a length in the direction of motion that is approximately the same value as the value of the width of the void.

5. The electric motor of claim 3, wherein the void has substantially no ferrous component therein.

6. The electric motor of claim 1, wherein the magnet assembly is self-limiting in movement in the direction of motion relative to the driving element when the driving element produces a magnetic field.

7. A load driving machine, comprising:

an electrical motor coupled to the load, the electrical motor including;

a driven element having a direction of movement, the driven element being directly coupled to the load;

a magnet assembly connected to the driven element, the magnet assembly including;

a first magnet having a first magnetic pole and a second magnetic pole; and

a second magnet having a first magnetic pole and a second magnetic pole, the first magnetic pole of the first magnet and the first magnetic pole of the second magnet being proximate to each other and facing each other thereby defining a first magnetic zone therebetween, the first magnetic poles all being similar, and the second magnetic poles all being similar;

a first ferrous member positioned between the first magnetic pole of the first magnet and the first magnetic pole of the second magnet, the first ferrous member coupling a substantial amount of the magnetic field emanating from the first magnetic poles and directing the substantial amount of the magnetic field to a gap between the ferrous member and the at least one driving element;

a third magnet having a first magnetic pole and a second magnetic pole, the second magnetic pole being proximate to the second magnetic pole of the second magnet and facing each other thereby defining a second magnetic zone; and

a second ferrous member positioned between the second magnetic pole of the second magnet and the second magnetic pole of the third magnet; and

at least one driving element proximate to the magnet assembly, the at least one driving element producing a magnetic field that is primarily orthogonal to the direction of movement within the at least one driving element, the at least one driving element includes a first driving element and a second driving element each being proximate to the magnet assembly on opposite sides of the magnet assembly, the first driving element and the second driving element produce magnetic fields that are primarily orthogonal to the direction of movement within the at least one driving element, the magnetic fields of the first driving element and the second driving element being configured to direct the same polarity of magnetic field toward the magnet assembly.

8. The load driving machine of claim 7, wherein the driving elements are electrical coils with a central void.

9. The load driving machine of claim 8, wherein the central void has a width that is generally uniform across a width of the driven element.

10. The load driving machine of claim 9, wherein the second magnet has a length in the direction of motion that is approximately the same value as the value of the width of the void.

11. The load driving machine of claim 9, wherein the void has substantially no ferrous component therein.

12. The load driving machine of claim 7, wherein the magnet assembly is self-limiting in movement in the direction of motion relative to the driving element when the driving element produces a magnetic field.