Distributed Coil Stator for External Rotor Three Phase Electric Motors

• US 20080030096A1
• Filed: 07/30/2007
• Published: 02/07/2008
• Est. Priority Date: 08/01/2006
• Status: Active Grant

• Current Assignee: Hunter Fan Company (Griffon Corporation)
• Original Assignee: Hunter Fan Company (Griffon Corporation)
• Inventors: Mehta, Vinay
• Granted Patent: US 7,777,388 B2
• Time in Patent Office: Days
• US Class Current: 310/208
• CPC Class Codes: H02K 1/165 Shape, form or location of the slots
• CPC Class Codes: H02K 17/12 for multi-phase current
• CPC Class Codes: H02K 3/28 Layout of windings or of connections between windings windings for pole-changing H02K17/06, H02K17/14, H02K19/12, H02K19/32
• CPC Class Codes: Y10T 29/49009 Dynamoelectric machine
• CPC Class Codes: Y10T 29/49012 Rotor

Abstract

A distributed coil stator (102) for external rotor electric motors includes a core having a cylindrical surface bounded by a first end surface and a second end surface, wherein a first set of openings (110) aligned in a first circular path (111) extends within the core from the first end surface to the second end surface, a second set of openings (114) aligned in a second circular path (115) positioned concentrically within the first circular path extends within the core from the first end surface to the second end surface, and a third set of openings (118) aligned in a third circular path (119) positioned concentrically within the second circular path extends within the core from the first end surface to the second end surface.

Claims

1. A distributed coil stator for three phase external rotor electric motors, comprising a core having a cylindrical surface bounded by a first end surface and a second end surface, a first set of openings aligned in a first circular path extends along said core between said first end surface and said second end surface, a second set of openings aligned in a second circular path positioned concentrically within said first circular path extends along said core between said first end surface and said second end surface, and a third set of openings aligned in a third circular path positioned concentrically within said second circular path extends along said core between said first end surface and said second end surface.

2. The distributed coil stator of claim 1, wherein each of said first, second, and third sets of openings include linear openings extending radially from said exterior cylindrical surface to said first, second, and third set of openings to form slots extending along said exterior surface between said first end surface and said second end surface.

3. The distributed coil stator of claim 1, wherein at least one of said first, second, and third set of openings has a different shape or a different size from the other said sets.

4. The distributed coil stator of claim 1, wherein said first set of openings corresponds to a first phase of a three-phase power system, said second set of openings corresponds to a second phase of said three-phase power system, and said third set of openings corresponds to a third phase of said three-phase power system.

5. The distributed coil stator of claim 1, further comprising a first plurality of conductors extending through said first set of openings and wrapping around in at least one loop between adjacent pairs of said first set of openings to form a first set of stator coils, a second plurality of conductors extending through said second set of openings and wrapping around in at least one loop between adjacent pairs of said second set of openings to form a second set of stator coils, and a third plurality of conductors extending through said third set of openings and wrapping around in at least one loop between adjacent pairs of said third set of openings to form a third set of stator coils.

6. The distributed coil stator of claim 5, wherein said first set of stator coils corresponds to a first phase of a three-phase power system, said second set of stator coils corresponds to a second phase of said three-phase power system, and said third set of stator coils corresponds to a third phase of said three-phase power system.

7. The distributed coil stator of claim 5, wherein at least one of said first, second, and third plurality of conductors extends through and wraps around between said adjacent pairs of said first, second, or third set of openings respectively in a different number of loops than said other pluralities.

8. The distributed coil stator of claim 5, wherein said first plurality of conductors extends through and wraps around between said adjacent pairs of said first set of openings in a first number of loops, said second plurality of conductors extends through and wraps around between said adjacent pairs of said second set of openings in a second number of loops, and said third plurality of conductors extends through and wraps around between said adjacent pairs of said third set of openings in a third number of loops, said first number of loops being greater than said second number of loops being greater than said third number of loops.

9. The distributed coil stator of claim 5, wherein said core is disposed concentrically within a rotor comprising an annular mass having a plurality of openings extending longitudinally therethrough and positioned in a fourth circular path, wherein a fourth plurality of conductors extend through said plurality of openings and are electrically connected.

10. A method for providing a distributed coil stator for external rotor electric motors, comprising:

providing a core having a cylindrical surface bounded by a first end surface and a second end surface;

forming a first set of openings that extend within said core from said first end surface to said second end surface along a first circular path;

forming a second set of openings that extend within said core from said first end surface to said second end surface along a second circular path concentrically disposed within said first circular path; and

forming a third set of openings that extend within said core from said first end surface to said second end surface along a third circular path concentrically disposed within said second circular path.

11. The method of claim 10, further comprising configuring the shape or size of at least one of said first, second, and third set of openings dependent on the number of openings needed to obtain a desired number of magnetic poles corresponding to a desired motor speed.

12. The method of claim 10, further comprising:

extending a first plurality of conductors through said first set of openings and wrapping said first plurality of conductors around in at least one loop between adjacent pairs of said first set of openings to form a first set of stator coils;

extending a second plurality of conductors through said second set of openings and wrapping said second plurality of conductors around in at least one loop between adjacent pairs of said second set of openings to form a second set of stator coils; and

extending a third plurality of conductors through said third set of openings and wrapping said third plurality of conductors around in at least one loop between adjacent pairs of said third set of openings to form a third set of stator coils.

13. The method of claim 12, further comprising configuring the number of loops of at least one of said first, second, and third plurality of conductors extended through and wrapped around between said adjacent pairs of said first, second, or third set of openings respectively dependent on the desired amount of operational magnetic flux to be produced by said first, second, or third stator coils respectively.

14. The method of claim 12, further comprising:

extending through and wrapping around said first plurality of conductors between said adjacent pairs of said first set of openings in a first number of loops;

extending through and wrapping around said second plurality of conductors between said adjacent pairs of said second set of openings in a second number of loops; and

extending through and wrapping around said third plurality of conductors between said adjacent pairs of said third set of openings in a third number of loops,

wherein said first number of loops is greater than said second number of loops which is greater than said third number of loops.

15. The method of claim 12, further comprising:

providing a rotor comprising an annular mass having a plurality of openings extending longitudinally therethrough positioned in a fourth circular path and a fourth plurality of conductors extending through said plurality of openings and electrically connected; and

disposing said core concentrically within said rotor.

16. A coil stator comprising:

a core;

a first annular array of openings;

a second annular array of openings positioned concentrically within said first annular array of openings, and

a third annular array of openings positioned concentrically within said second annular array of openings.

17. The distributed coil stator of claim 16, wherein each of said first, second, and third array of openings include linear openings extending radially from said openings to a peripheral edge of said stator to form slots.

18. The distributed coil stator of claim 16, wherein said first array of openings corresponds to a first phase of a three-phase power system, said second array of openings corresponds to a second phase of said three-phase power system, and said third array of openings corresponds to a third phase of said three-phase power system.

19. The distributed coil stator of claim 16, further comprising a first plurality of conductors extending through said first array of openings and wrapping around in at least one loop between adjacent pairs of said first array of openings to form a first set of stator coils, a second plurality of conductors extending through said second array of openings and wrapping around in at least one loop between adjacent pairs of said second array of openings to form a second set of stator coils, and a third plurality of conductors extending through said third array of openings and wrapping around in at least one loop between adjacent pairs of said third array of openings to form a third set of stator coils.

20. The distributed coil stator of claim 19, wherein said first set of stator coils corresponds to a first phase of a three-phase power system, said second set of stator coils corresponds to a second phase of said three-phase power system, and said third set of stator coils corresponds to a third phase of said three-phase power system.