Hybrid-energized electric machine

• US 5,672,926 A
• Filed: 02/20/1996
• Issued: 09/30/1997
• Est. Priority Date: 02/21/1995
• Status: Expired due to Fees

• Current Assignee: Siemens AG
• Original Assignee: Siemens AG
• Inventors: Schuller, Uwe, Brandes, Jurgen
• Primary Examiner(s): Stephan, Steven L.
• Assistant Examiner(s): NGUYEN, TRAN N
• Application Number:
  US08/602,484
• Time in Patent Office: 588 Days
• Field of Search: 310/181, 310/183, 310/144, 310/126, 310/156, 310/263, 310/261, 322/46
• US Class Current: 310/181
• CPC Class Codes: H02K 1/2746 the rotor consisting of magnets arranged with the same polarity, e.g. consequent pole type
• CPC Class Codes: H02K 21/042 with permanent magnets and field winding both rotating
• CPC Class Codes: H02K 21/20 having windings each turn of which co-operates only with poles of one polarity, e.g. homopolar machine
• CPC Class Codes: H02K 3/527 applicable to rotors only
• CPC Class Codes: Y10S 174/20 Stator
• CPC Class Codes: Y10S 174/21 Rotor

Abstract

A hybrid-energized electric machine includes a laminated stator core that has a stator winding and is arranged in a magnetic yoke, where the rotor is divided axially into two rotor halves, and each rotor half has permanent-field poles and non-energized poles arranged in succession in accordance with the pole pitch, where one rotor half is fitted with permanent magnets of one polarity (N) and the other rotor half is fitted with permanent magnets of the other polarity (S), and the permanent-field poles of both rotor halves are offset with respect to each other by one pole pitch, and said electric machine is also provided with an electric field coil designed as a ring coil. Both scattering and line losses can be reduced due to the fact that rotor halves are arranged on the rotor shaft with an axial distance between them, and field coil is inserted into the space between rotor halves.

Claims

1. A hybrid-energized electric machine comprising:

a) a magnetic yoke;

b) a stator winding;

c) a laminated stator core being disposed in the magnetic yoke and supporting the stator winding;

d) a rotor shaft;

e) a rotor being divided axially into a first rotor half and a second rotor half, forming a space therebetween, said first rotor half including;

(i) a first permanent magnet having a first polarity (N);

(ii) a first plurality of permanent field poles that are energized by the first permanent magnet; and

(iii) a first plurality of non-energized poles that are not energized by the first permanent magnet, wherein the first plurality of permanent field poles and the first plurality of non-energized poles are interspersed according to pole pitch; and

said second rotor half including;

(i) a second permanent magnet having a second polarity (S);

(ii) a second plurality of permanent field poles that are energized by the second permanent magnet; and

(iii) a second plurality of non-energized poles that are not energized by the second permanent magnet, wherein the second plurality of permanent field poles and the second plurality of non-energized poles are interspersed according to pole pitch, and the first and second plurality of permanent field poles are offset with respect to each other by one pole pitch;

f) an electric field ring coil, wherein said first and second rotor halves are arranged on said rotor shaft with an axial distance between them; and

g) a field coil being disposed into said space formed between said first and second rotor halves.

2. The machine according to claim 1, wherein said first and second permanent magnets are disposed on a surface of said first and second rotor halves, respectively.

3. The machine according to claim 1, further comprising a plurality of receptacle holes provided in the laminated core of each rotor half and extending in a peripheral direction, wherein said first and second permanent magnets are disposed in the plurality of receptacle holes, wherein an arrangement and design of the plurality of receptacle holes is such that a magnetic short-circuit of the first and second permanent magnets inserted into the plurality of receptacle holes is prevented.

4. The machine according to claim 3, further comprising:

a) a plurality of saturation segments; and

b) a plurality of secant-like core parts of the laminated rotor core being adjacent to the plurality of receptacle holes towards a periphery of the rotor and being connected to neighboring non-energized pole parts only by means of the plurality of saturation segments.

5. The machine according to claim 3, further comprising a thermosetting plastic compound securing the first and second permanent magnets in the plurality of receptacle holes.

6. The machine according to claim 4, further comprising a thermosetting plastic compound securing the first and second permanent magnets in the plurality of receptacle holes.

7. The machine according to claim 1, further comprising a winding support on which the winding of the field coil is arranged.

8. The machine according to claim 7, further comprising a wall part, wherein the winding support is enclosed by means of the wall part on a peripheral side that corresponds to a peripheral side of the rotor halves.

9. The machine according to claim 8, wherein the winding support comprises a side wall that extends radially and said wall part on the peripheral side is connected in one piece to the side wall of the winding support.

10. The machine according to claim 9, wherein the winding support includes a U-shaped cross section in an axial direction.

11. The machine according to claim 1, wherein the first and second rotor halves and the field coil are designed as individual modules that can be handled independently of each other and can be mounted on the rotor shaft.

12. The machine according to claim 7, wherein the winding support is mounted on the rotor shaft in such a way that it is secured rotationally.

13. The machine according to claim 12, further comprising a plurality of axial projections on the winding support, and a plurality of corresponding recesses, wherein the plurality of axial projections engage in the plurality of corresponding recesses in the laminated cores of one or both rotor halves.

14. The machine according to claim 12, wherein the winding support is held on the rotor shaft by a force fit.

15. The machine according to claim 7, wherein the winding support and/or winding that is mounted on winding support is embedded in a thermosetting plastic compound.