Electric machine, rotor and associated method

Patent metadata

Field	Value
Publication number	US-9837867-B2
Application number	US-201414335970-A
Country	US
Kind code	B2
Filing date	Jul 21, 2014
Priority date	Jul 21, 2014
Publication date	Dec 5, 2017
Grant date	Dec 5, 2017

Abstract

A rotor for connection to a rotating member for use in an electric machine is provided. The rotor includes a first member connected to the rotating member and generally positioned perpendicularly thereto and a second member connected to one of the rotating member and the first member.

First claim

What is claimed is:

1. An axial flux electric motor, comprising:
a housing;
a stator having a solitary ferrous core and fixedly secured to said housing and defining an inner periphery and an outer periphery therefore;
a solitary rotor rotatably secured to said housing, the rotor including a ferrite magnet, the magnet defining at least one an outer periphery extending beyond said stator in a direction normal to the rotation of said rotor and an inner periphery extending beyond said stator in a direction normal to the rotation of said rotor, at least one of said stator or said rotor adapted for use in a fluid moving application;
wherein the outer periphery of said magnet extends beyond said stator in a direction normal to the rotation of said rotor a first extension distance;
wherein the inner periphery of said magnet extends beyond said stator in a direction normal to the rotation of said rotor a second extension distance;
wherein the ferrous core is generally ring shaped defining a ferrous core radial distance; and
wherein the first extension distance and the second extension distance may be as large as the ferrous core radial distance.

2. The motor as in claim 1 , wherein the ferrite magnet has a plurality of magnet segments.

3. The motor as in claim 1 , wherein a skewed magnetic field is induced into the magnet.

4. An axial flux electric motor, comprising:
a housing;
a stator having a solitary ferrous core and fixedly secured to said housing and defining an inner periphery and an outer periphery therefore;
a solitary rotor rotatably secured to said housing, the rotor including a ferrite magnet, the magnet defining at least one an outer periphery extending beyond said stator in a direction normal to the rotation of said rotor and an inner periphery extending beyond said stator in a direction normal to the rotation of said rotor, at least one of said stator or said rotor adapted for use in a fluid moving application;
wherein the outer periphery of said magnet extends beyond said stator in a direction normal to the rotation of said rotor, the outer periphery of said magnet defining a magnet diameter;
wherein the ferrous core of said stator defines a stator core diameter; and
wherein the magnet diameter may be as much as 50 percent larger than stator core diameter.

5. The motor as in claim 4 , wherein the ferrite magnet is generally ring shaped.

6. The motor as in claim 4 , wherein the ferrite magnet has a plurality of magnet segments.

7. The motor as in claim 4 , wherein a skewed magnetic field is induced into the magnet.

8. The motor as in claim 4 , wherein the inner periphery of said ferrite magnet extends inwardly beyond said stator in a direction normal to the rotation of said ring magnet.

9. An axial flux electric motor, comprising:
a housing;
a stator having a solitary ferrous core and fixedly secured to said housing and defining an inner periphery and an outer periphery therefore;
a solitary rotor rotatably secured to said housing, the rotor including a ferrite magnet, the magnet defining at least one an outer periphery extending beyond said stator in a direction normal to the rotation of said rotor and an inner periphery extending beyond said stator in a direction normal to the rotation of said rotor, at least one of said stator or said rotor adapted for use in a fluid moving application;
wherein the rotor further includes a rotor core, the rotor core being generally ring shaped, said rotor core defining a rotor core inner periphery, a rotor core outer periphery and a rotor core radial distance between the rotor core inner periphery and the rotor core outer periphery;
wherein the outer periphery of said magnet extends beyond said rotor core in a direction normal to the rotation of said rotor a first extension distance;
wherein the inner periphery of said magnet extends beyond said rotor core in a direction normal to the rotation of said rotor a second extension distance; and
wherein the first extension distance and the second extension distance may be as large as the rotor core radial distance.

10. The motor as in claim 9 , wherein the ferrite magnet has a plurality of magnet segments.

11. The motor as in claim 9 , wherein a skewed magnetic field is induced into the magnet.

12. An axial flux electric motor, comprising:
a housing;
a stator having a solitary ferrous core and fixedly secured to said housing and defining an inner periphery and an outer periphery therefore;
a solitary rotor rotatably secured to said housing, the rotor including a ferrite magnet, the magnet defining at least one an outer periphery extending beyond said stator in a direction normal to the rotation of said rotor and an inner periphery extending beyond said stator in a direction normal to the rotation of said rotor, at least one of said stator or said rotor adapted for use in a fluid moving application;
wherein the rotor further includes a rotor core, the rotor core being generally ring shaped, said rotor core defining a rotor core inner periphery, a rotor core outer periphery and a rotor core radial distance between the rotor core inner periphery and the rotor core outer periphery;
wherein the outer periphery of said magnet extends beyond said rotor core in a direction normal to the rotation of said rotor, the outer periphery of said magnet defining a magnet diameter;
wherein the rotor core of said rotor defines a rotor core diameter; and
wherein the magnet diameter may be as much as 50 percent larger than rotor core diameter.

13. The motor as in claim 12 , wherein the ferrite magnet has a plurality of magnet segments.

14. The motor as in claim 12 , wherein a skewed magnetic field is induced into the magnet.

15. The motor as in claim 12 , wherein the inner periphery of said ferrite magnet extends inwardly beyond said stator in a direction normal to the rotation of said ring.

Assignees

• Regal Beloit America Inc

Inventors

• Brahmavar Subhash Marutirao
• Heins Greg
• Langford Charles Richard

Classifications

• H02K1/2793 Primary

  Rotors axially facing stators · CPC title

• H02K15/03

  having permanent magnets · CPC title

• H02K7/14

  Structural association with mechanical loads, e.g. with hand-held machine tools or fans (with fan or impeller for cooling the machine H02K9/06) · CPC title

• H02K5/1732

  radially supporting the rotary shaft at both ends of the rotor (H02K5/1737 takes precedence) · CPC title

• H02K1/2795 Primary

  the rotor consisting of two or more circumferentially positioned magnets · CPC title