Stator for an electric machine, electric machine and production method

Patent metadata

Field	Value
Publication number	US-11070100-B2
Application number	US-201615758683-A
Country	US
Kind code	B2
Filing date	Jul 21, 2016
Priority date	Sep 10, 2015
Publication date	Jul 20, 2021
Grant date	Jul 20, 2021

Abstract

A stator for an electric machine includes a stator carrier having a plurality of grooves with a respective groove base, and a motor winding having at least one first strand. A predetermined number of first grooves of the plurality of grooves is associated with the first strand. At least one coil section of the first strand is introduced into each of the first grooves. The first strand has a plurality of individual wires connected electrically in parallel, with each wire formed as a round wire. At least some of the individual wires in each of the coil sections are arranged above one another in a radial direction of the stator. The coil sections are each arranged in the first grooves in such a way that an average radial distance of the individual wires to the groove base is equal for all individual wires.

First claim

What is claimed is:

1. A stator for an electric machine, said stator comprising:
a stator carrier having a plurality of grooves, each said groove having a groove base; and
a motor winding including a first strand, with a predetermined number of first grooves of the plurality of grooves being assigned to the first strand, said first strand having coil sections which are introduced in the first grooves, respectively, said first strand including a plurality of individual wires which are connected electrically in parallel, with each wire embodied as a round wire, at least a few of the individual wires in each of the coil sections being arranged above one another in a radial direction of the stator, said coil sections being arranged in the first grooves such that an average radial distance of the individual wires from the groove base is equal for all of the individual wires, said first strand configured to have at least two electrically parallel branches and having in each of the branches a transposition area, at which, after winding of a first coil, at a transition to a subsequent chained coil, the parallel individual wires are turned by 180° and then further turned by 180° within a winding so that the coil sections and the individual wires are arranged in opposite directions between the first grooves.

2. The stator of claim 1 , wherein the coil sections in the first grooves are divided into a first group and a second group, the individual wires of the coil sections of the first group being arranged in a first order in the radial direction, and the individual wires of the coil sections of the second group being arranged in a second order opposite to the first order.

3. The stator of claim 1 , wherein the first strand is configured to form a winding with a winding head, said transposition area being arranged within the winding head.

4. The stator of claim 1 , wherein the first strand includes a plurality of coils, each of the coils having at least one winding, which is formed between two of the first grooves, said transposition area being arranged within at least one coil of the plurality of coils.

5. The stator of claim 4 , wherein each of the coils has a plurality of windings, which are arranged above one another in the radial direction.

6. The stator of claim 1 , wherein the first strand includes a plurality of coils, each of the coils having at least one winding, which is formed between two of the first grooves, said transposition area being arranged at least between two adjacent coils of the plurality of coils.

7. The stator of claim 5 , wherein each of the coils has a plurality of windings, which are arranged above one another in the radial direction.

8. The stator of claim 1 , wherein the motor winding includes a second strand, to which a predetermined number of second grooves of the plurality of grooves is assigned, and a third strand, to which a predetermined number of third grooves of the plurality of grooves is assigned.

9. An electric machine, comprising:
a stator comprising a stator carrier having a plurality of grooves, each said groove having a groove base, and a motor winding including a first strand, with a predetermined number of first grooves of the plurality of grooves being assigned to the first strand, said first strand having coils sections which are introduced in the first grooves, respectively, said first strand including a plurality of individual wires which are connected electrically in parallel, with each wire embodied as a round wire, at least a few of the individual wires in each of the coil sections being arranged above one another in a radial direction of the stator, said coil sections being arranged in the first grooves such that an average radial distance of the individual wires from the groove base is equal for all of the individual wires, said first strand configured to have at least two electrically parallel branches and having in each of the branches a transposition area, at which, after winding of a first coil, at a transition to a subsequent chained coil, the parallel individual wires are turned by 180° and then further turned by 180° within a winding so that the coil sections and the individual wires are arranged in opposite directions between the first grooves; and
a rotor interacting with the stator.

10. The electric machine of claim 9 , wherein the coil sections in the first grooves are divided into a first group and a second group, the individual wires of the coil sections of the first group being arranged in a first order in the radial direction, and the individual wires of the coil sections of the second group being arranged in a second order opposite to the first order.

11. The electric machine of claim 9 , wherein the first strand is configured to form a winding with a winding head, said transposition area being arranged within the winding head.

12. The electric machine of claim 9 , wherein the first strand includes a plurality of coils, each of the coils having at least one winding, which is formed between two of the first grooves, said transposition area being arranged within at least one coil of the plurality of coils.

13. The electric machine of claim 12 , wherein each of the coils has a plurality of windings, which are arranged above one another in the radial direction.

14. The electric machine of claim 9 , wherein the first strand includes a plurality of coils, each of the coils having at least one winding, which is formed between two of the first grooves, said transposition area being arranged at least between two adjacent coils of the plurality of coils.

15. The electric machine of claim 14 , wherein each of the coils has a plurality of windings, which are arranged above one another in the radial direction.

16. The electric machine of claim 9 , wherein the motor winding includes a second strand, to which a predetermined number of second grooves of the plurality of grooves is assigned, and a third strand, to which a predetermined number of third grooves of the plurality of grooves is assigned.

17. A method for producing a stator of an electric machine, said method comprising:
providing a stator carrier with a plurality of grooves;
assigning a predetermined number of first grooves of the plurality of grooves to a first strand of a motor winding;
introducing a coil section of the first strand into each of the first grooves;
connecting a plurality of individual round wires of the first strand electrically in parallel;
arranging at least a few of the individual wires in each of the coil sections above one another in a radial direction;
arranging the coil sections hi the first grooves such that an average radial distance from the individual wires to the groove base is equal for all individual wires; and
providing in each of at least two electrically parallel branches of the first strand a transposition area, at which, after winding of a coil, at a transition to a subsequent chained coil, the parallel individual wires are turned by 180° and then further turned by 180° within a winding so that the coil sections and the individual wires are arranged in opposite directions between the first grooves.

Assignees

• Siemens Ag

Inventors

• Bernhardt Michael
• Fritsch Daniel
• Müller Michael

Classifications

• H02K3/28

  Layout of windings or of connections between windings (windings for pole-changing H02K17/06, H02K17/14, H02K19/12, H02K19/32) · CPC title

• H02K3/14 Primary

  with transposed conductors, e.g. twisted conductors · CPC title

• H02K2201/03

  Machines characterised by aspects of the air-gap between rotor and stator · CPC title

• H02K15/085

  by laying conductors into slotted stators · CPC title

• H02K3/48

  in slots · CPC title