Parallel air gap serial flux A.C. electrical machine

• US 5,396,140 A
• Filed: 05/28/1993
• Issued: 03/07/1995
• Est. Priority Date: 05/28/1993
• Status: Expired due to Term

• Current Assignee: Perfect Galaxy International Limited
• Original Assignee: Satcon Technology Corporation
• Inventors: Goldie, James H., Kirtley, James
• Primary Examiner(s): SKUDY, ROBERT
• Application Number:
  US08/069,080
• Time in Patent Office: 648 Days
• Field of Search: 310/268, 310/112, 310/114, 310/179, 310/180, 310/184, 310/156, 310/216, 310/254, 310/166, 310/261
• US Class Current: 310/268
• CPC Class Codes: H02K 17/16 having rotors with internally short-circuited windings, e.g. cage rotors
• CPC Class Codes: H02K 21/24 with magnets axially facing the armatures, e.g. hub-type cycle dynamos
• CPC Class Codes: H02K 41/025 Asynchronous motors
• CPC Class Codes: H02K 41/03 Synchronous motors; Motors moving step by step; Reluctance motors H02K41/035 takes precedence

Abstract

An a.c. electrical machine includes a plurality of first elements spaced from each other; a plurality of second elements spaced from each other and interstitially disposed with the first elements; a plurality of electrical windings on each of the first elements providing a current flow in a first direction; and a return for completing a magnetic flux path in a second direction perpendicular to the first direction on successive first elements and through the second elements for generating a force in a third mutually perpendicular direction between the first and second elements.

Claims

1. A rotary induction machine comprising:

a plurality of axially spaced rotors;

a plurality of axially spaced stators interstitially disposed with said rotors;

a plurality of magnetically isolated magnetic teeth on each of said rotors and said stators, the plurality of teeth on each rotor being different in number from the plurality of teeth on each stator;

return means including magnetic material for establishing a low reluctance azimuthal flux path;

a plurality of conductor paths surrounding said teeth on each said rotor; and

a plurality of electrical windings on each stator, each winding surrounding a different group of magnetic teeth for inducing a magnetic flux axially in a path in series through corresponding groups of teeth on successive rotor and stator disks and returning azimuthally through said return means.

2. The rotary induction machine of claim 1 in which said rotors and stators are disk shaped.

3. The rotary induction machine of claim 2 in which said magnetic teeth are embedded in the disk shaped rotors and stators.

4. The rotary induction machine of claim 1 in which said magnetic teeth are laminated.

5. The rotary induction machine of claim 1 in which there are more magnetic teeth on the stator than on the rotor.

6. The rotary induction machine of claim 1 in which said rotors include non-magnetic material.

7. The rotary induction machine of claim 1 in which said stators include non-magnetic, non-conducting material.

8. The rotary induction machine of claim 1 in which said rotor is made of conducting material for establishing said conductor paths.

9. The rotary induction machine of claim 1 in which said electrical windings are integral with each stator.

10. The rotary induction machine of claim 1 in which said return means include generally disk-shaped members forming end caps of the machine.

11. An a.c. rotary electrical machine comprising:

a plurality of axially spaced rotors;

a plurality of axial spaced stators interstitially disposed with said rotors;

a plurality of magnetically isolated magnetic teeth on each of said stators;

a plurality of electrical windings on each stator, each winding surrounding a different group of magnetic teeth; and

return means including magnetic material for establishing a magnetic flux path axially in series through corresponding groups of teeth on successive stators, and interstitial rotors, and azimuthally in said return means; and

said machine is a rotary induction machine, said rotors each include a plurality of magnetic teeth;

number of teeth on each rotor being different from a number on each stator, and there are a plurality of conductor paths said teeth on each rotor.

12. The a.c. rotary electrical machine of claim 11 in which said machine is a permanent magnet rotary synchronous machine, said rotors are multipole and axially magnetized, and each pole of each multipole rotor induces a magnetic flux in said magnetic flux path axially in series through corresponding groups of teeth on successive stators and poles of the rotors.

13. An a.c. electrical machine comprising:

a plurality of first elements spaced from each other, each including a plurality of magnetically isolated magnetic teeth;

a plurality of second elements spaced from each other and interstitially disposed with said first elements;

a plurality of electrical windings on each of said first elements, each winding associated with a different group of magnetic teeth for providing a current flow in a first direction; and

return means for completing a magnetic flux path in a second direction perpendicular to said first direction through corresponding groups of teeth on successive said first elements and through said second elements for generating a force in a third mutually perpendicular direction between said first and second elements;

said machine is an induction machine, said second elements each include a plurality of magnetic teeth, a number of teeth on each second element is different from number of said teeth of on each first element, and there are a plurality of conductor paths surrounding said teeth of each second element.

14. The a.c. electrical machine of claim 13 in which said machine is a rotary machine, said first elements are stators, said second elements are rotors, said first direction is radial, said second direction is axial, and said third direction is circumferential.