Electric motor

• US 6,717,318 B1
• Filed: 09/27/1999
• Issued: 04/06/2004
• Est. Priority Date: 12/14/1996
• Status: Expired due to Fees

• Current Assignee: Danfoss Drives A/S (Danfoss A/S)
• Original Assignee: Danfoss Drives A/S (Danfoss A/S)
• Inventors: Mathiassen, Ole
• Primary Examiner(s): Lam, Thanh
• Application Number:
  US09/331,501
• Time in Patent Office: 1,653 Days
• Field of Search: 310/216, 310/179, 310/180, 310/208, 310/258, 310/259, 310/51, 310/181, 310/190, 310/191, 310/192, 310/162
• US Class Current: 310/216.004
• CPC Class Codes: H02K 11/33 Drive circuits, e.g. power electronics H02K11/38 takes precedence
• CPC Class Codes: H02P 27/06 using dc to ac converters or inverters H02P27/05 takes precedence

Abstract

The invention concerns an electric motor with a stator, in whose bore a rotor is arranged, and with a control arrangement having at least one coil with a core passed by the motor current. The coil shall be arranged in a space saving manner without interfering too much with the magnetic field of the motor. To solve this problem the core of the coil is arranged on the stator whose iron is used for a magnetic circuit.

Claims

1. An electric motor comprising a stator having a bore in which a rotor is located, and having a motor control arrangement connected to the motor, the control arrangement having at least one coil with a core, the coil being located in an intermediate circuit of the control arrangement between a rectifier and an inverter of the control arrangement and being loaded by d.c. current of the motor, the core of the coil being located on the stator, and the stator being comprised of iron, the iron being used for a magnetic circuit for the coil.

2. Motor according to claim 1, in which the core is part of the stators.

3. Motor according to claim 1, in which the stator has at least one flux restriction for separation of magnetic flux of the coil on one side and magnetic flux of the stator on the other side.

6. Motor according to claim 1, in which the core only extends over part of the axial length of the stator.

7. Motor according to claim 1, in which the stator has a substantially rectangular cross section and the coil is located in a corner of this cross section.

8. Motor according to claim 1, in which the stator and the core are formed with laminated sheet plates.

9. Motor according to claim 8, in which the core is formed by the same process used for forming the laminated sheets of the stator.

10. Motor according to claim 8, in which in an axial direction the stator consists of at least two different types of laminated sheet plates having different shapes, of which one has no core forming area.

11. Motor according to claim 1, in which the coil is fitted on a coil carrier shaped to be pushed onto the core.

12. Motor according to claim 1, in which the core is substantially oriented in a radial direction.

13. Motor according to claim 12, in which the core is located in a volume in the stator, which volume is closed by a cover.

14. Motor according to claim 13, in which the cover is welded onto the stator.

15. Motor according to claim 1, in which the stator has longitudinal outer sides, and the core of the control arrangement has a length which is substantially parallel to one of the outer sides of the stator.

16. Motor according to claim 15, in which the entire core of the control arrangement is offset inwardly from said one outer side.

17. Motor according to claim 1, including several coils, each coil having its own core.

18. Motor according to claim 17, in which at least two of the coils are part coils of a function coil from the group consisting of an intermediary circuit coil, filter coil, noise suppression coil or motor coil.

19. Motor according to claim 17, in which the coils are at least two different function coils from the group consisting of an intermediary circuit coil, filter coil, noise suppression coil or motor coil.

4. An electric motor comprising a stator having a bore in which a rotor is located, and having a control arrangement having at least one coil with a core, the coil being loaded by current of the motor, the core of the coil being located on the stator, and the stator being comprised of iron, the iron being used for a magnetic circuit, the stator having at least one flux restriction for separation of magnetic flux of the coil on one side and magnetic flux of the stator winding on the other side, the flux restriction comprising at least one hole in the stator, which is filled with a magnetically non- or poorly conducting material.

5. Motor according to claim 4, including a cooling medium in the hole.