Double variable reluctance resolver for a multiple speed resolver system

• US 20040263014A1
• Filed: 04/27/2004
• Published: 12/30/2004
• Est. Priority Date: 04/28/2003
• Status: Active Grant

• Current Assignee: Minebea Mitsumi, Inc.
• Original Assignee: Minebea Company Limited (MinebeaMitsumi Inc.)
• Inventors: Miya, Taiichi
• Granted Patent: US 7,157,906 B2
• Time in Patent Office: Days
• US Class Current: 310/168
• CPC Class Codes: G01D 3/10 with provision for switching-in of additional or auxiliary indicators or recorders
• CPC Class Codes: G01D 5/2046 by a movable ferromagnetic element, e.g. a core
• CPC Class Codes: G01P 3/488 delivered by variable reluctance detectors

Abstract

A double variable reluctance resolver in which a redundancy is given to a variable reluctance resolver to improve reliability. The double variable reluctance resolver also functions as a multiple speed resolver system.

Claims

1. A double variable reluctance resolver comprising:

a first VR resolver, wherein the first VR resolver includes a first plurality of stator magnetic poles and a first rotor;

a second VR resolver, wherein the second VR resolver includes a second plurality of stator magnetic poles and a second rotor, wherein a predetermined group of the poles of the second plurality of stator magnetic poles correspond to the first plurality of stator magnetic poles, and windings of the first VR resolver are coiled such that the output of secondary windings provided on the first plurality of stator magnetic poles is substantially the same as the output of the predetermined group of stator magnetic poles.

2. The double variable reluctance resolver according to claim 1, wherein the number windings on each stator magnetic pole of the first VR resolver is the same as the number of windings on each stator magnetic pole of the second VR resolver.

3. The double variable reluctance resolver according to claim 1, wherein the output of the secondary windings of the first VR resolver corresponds to the rotor shape.

4. The double variable reluctance resolver according to claim 1, wherein the first and second VR resolvers are stacked so that each stator magnetic pole of the first plurality is angularly offset from each stator magnetic pole of the second plurality.

5. The double variable reluctance resolver according to claim 2, wherein the first and second VR resolvers are stacked so that each stator magnetic pole of the first plurality is angularly offset from the stator magnetic poles of the second plurality.

6. The double variable reluctance resolver according to claim 4, wherein the double resolver has a plurality of angular stator magnetic pole positions, and every other magnetic pole position is occupied by a stator magnetic pole of the first plurality, and magnetic poles of the second plurality are located between the poles of the first plurality, such that the stator magnetic poles alternate between a pole of the first plurality and a pole of the second plurality in the circumferential direction.

7. The double variable reluctance resolver according to claim 4, wherein the first plurality occupies an angular range of 90°

and the second plurality occupies an angular range of 90°

.

8. The double variable reluctance resolver according to claim 1, wherein the first and second rotors are coaxial.

9. The double variable reluctance resolver according to claim 2, wherein the first and second rotors are coaxial.

10. The double variable reluctance resolver according to claim 3, wherein the first and second rotors are coaxial.

11. The double variable reluctance resolver according to claim 4, wherein the first and second rotors are coaxial.

12. The double variable reluctance resolver according to claim 5, wherein the first and second rotors are coaxial.

13. The double variable reluctance resolver according to claim 6, wherein the first and second rotors are coaxial.

14. The double variable reluctance resolver according to claim 1, wherein the number of stator magnetic poles in the second plurality is an integer multiple, other than one, of the number of poles in the first plurality.

15. The double variable reluctance resolver according to claim 1, wherein the first and second rotors are fixed to one another and rotate as a unit.

16. A multiple speed resolver system, comprising:

a first VR resolver, wherein the first VR resolver includes a first plurality of stator magnetic poles and a first rotor;

a second VR resolver, wherein the second VR resolver includes a second plurality of stator magnetic poles and a second rotor, the second VR resolver is coaxial with the first VR resolver, the second plurality of magnetic poles include groups of stator magnetic poles such that each group of stator magnetic poles corresponds to the first plurality, and wherein the output of windings of each group of stator magnetic poles matches that of the first plurality.

17. The multiple speed resolver system according to claim 16 further comprising a resolver to digital converter for converting an output value of the first and second VR resolvers to a triangular wave, wherein the rotors rotate together as a unit, and a rotation angle of the rotors can be determined from the triangular wave.

18. The multiple speed resolver system according to claim 16, wherein the number windings on each stator magnetic pole of the first VR resolver is the same as the number of windings on each stator magnetic pole the second VR resolver.

19. The multiple speed resolver system according to claim 16, wherein the output of the secondary windings of the first VR resolver corresponds to the rotor shape.

20. The multiple speed resolver system according to claim 16, wherein the first and second VR resolvers are stacked so that each stator magnetic pole of the first plurality is angularly offset from each stator magnetic pole of the second plurality.