Dynamo-electric machine with reduced cogging torque

Patent metadata

Field	Value
Publication number	US-2020091805-A1
Application number	US-201716495118-A
Country	US
Kind code	A1
Filing date	Dec 20, 2017
Priority date	Mar 21, 2017
Publication date	Mar 19, 2020
Grant date	—

Abstract

A dynamo-electric machine includes a primary part having a plurality of teeth, grooves that are located between the teeth and a yoke that is produced from a ferromagnetic material, a secondary part that is spaced apart from the primary part via an air gap and comprises a plurality of permanent magnets that lie adjacent to one another with alternating polarity, a multi-phase tooth coil winding that is arranged in the grooves, wherein adjacent tooth coils are connected to form groups having an identical electrical phase, wherein adjacent teeth of the groups of tooth coils having an identical electrical phase are connected in a magnetically conductive manner via the yoke and the yoke is interrupted between adjacent tooth coils having a different electrical phase.

First claim

1 . A dynamo-electric machine comprising
a primary part having a plurality of teeth, grooves that are located between the teeth and a yoke that is produced from a ferromagnetic material, a secondary part that is spaced apart from the primary part via an air gap and comprises a plurality of permanent magnets that lie adjacent to one another with alternating polarity, a multi-phase tooth coil winding that is arranged in the grooves, wherein adjacent tooth coils are connected to form groups having an identical electrical phase, wherein adjacent teeth of groups of tooth coils having an identical electrical phase are connected in a magnetically conductive manner via the yoke and the yoke is interrupted between adjacent tooth coils having a different electrical phase.

2 . The dynamo-electric machine as claimed in claim 1 , wherein the adjacent tooth coils having an identical electrical phase are connected in series and comprise an opposite winding direction.

3 . The dynamo-electric machine as claimed in claim 2 , wherein one group respectively comprises precisely two tooth coils that are arranged in series, are wound in opposite directions and the same phase current flows through the tooth coils.

4 . The dynamo-electric machine as claimed in claim 3 , wherein the yoke comprises multiple yoke parts that respectively connect to one another in a magnetically conductive manner via two teeth having two tooth coils that are connected in series.

5 . The dynamo-electric machine of claim 1 wherein the primary part is configured as a circuit board that supports the tooth coils, the teeth and the yoke, wherein the interruptions of the yoke between the groups having a different electrical phase are filled by a composite material of the circuit board.

6 . The dynamo-electric machine as claimed in claim 5 , wherein the circuit board is configured as a multi-layer printed circuit board and the tooth coils are configured as solenoid coils that respectively comprise multiple flat coils that lie one above the other in a vertical direction.

7 . The dynamo-electric machine as claimed in claim 6 , wherein respectively two flat coils that are adjacent to one another in the vertical direction are arranged laterally offset with respect to one another in such a manner that in a cross section perpendicular to a surface of the multi-layer printed circuit board the conductor track sections of one flat coil are arranged in part overlapping in the vertical direction with two conductor track sections of the other flat coil.

8 . The dynamo-electric machine as claimed in claim 7 , wherein the outer conductor track sections of adjacent tooth coils engage with one another in a comb-shaped manner such that the cross section respectively one outer conductor track section of one tooth coil is arranged in part overlapping in a vertical direction with at least one outer conductor track section of the adjacent tooth coil.

9 . The dynamo-electric machine of claim 1 , wherein the dynamo-electric machine is configured as a linear motor.

10 . A dynamo-electric machine comprising:
a circuit board configured to support a yoke, teeth connected to the yoke, and grooves located between the teeth and the yoke; a secondary part that is spaced apart from the circuit board via an air gap, wherein the secondary part includes a plurality of permanent magnets that lie adjacent to one another with alternating polarity; and a multi-phase tooth coil winding that is arranged in the grooves, wherein adjacent tooth coils are connected to form groups having an identical electrical phase and adjacent teeth of the groups of tooth coils having an identical electrical phase are connected in a magnetically conductive manner via the yoke, wherein the yoke is interrupted between adjacent tooth coils having a different electrical phase.

11 . The dynamo-electric machine of claim 10 , wherein the adjacent tooth coils having an identical electrical phase are connected in series and comprise an opposite winding direction.

12 . The dynamo-electric machine of claim 11 , wherein one group respectively comprises two tooth coils that are arranged in series and that are wound in opposite directions and the same phase current flows through the tooth coils.

13 . The dynamo-electric machine of claim 12 , wherein the yoke includes multiple yoke parts that respectively connect to one another in a magnetically conductive manner via two teeth having two tooth coils.

14 . The dynamo-electric machine of claim 10 , wherein interruptions of the yoke between the groups having a different electrical phase are filled by a composite material of the circuit board.

15 . The dynamo-electric machine of claim 14 , wherein the circuit board is configured as a multi-layer printed circuit board and the tooth coils are configured as solenoid coils that include multiple flat coils that lie one above the other in a vertical direction.

16 . The dynamo-electric machine of claim 15 , wherein respectively two flat coils that are adjacent to one another in the vertical direction are arranged laterally offset with respect to one another in such a manner that in a cross section perpendicular to the surface of the multi-layer printed circuit board, conductor track sections of one flat coil are arranged in part overlapping in the vertical direction with two conductor track sections of another flat coil.

17 . The dynamo-electric machine as claimed in claim 16 , wherein the outer conductor track sections of adjacent tooth coils engage with one another in a comb-shaped manner with the result that in the cross section respectively one outer conductor track section of one tooth coil is arranged in part overlapping in the vertical direction with at least one outer conductor track section of the adjacent tooth coil.

18 . The dynamo-electric machine of claim 1 , wherein the dynamo-electric machine is configured as a rotary electrical machine.

19 . A dynamo-electric machine comprising:
a sheet metal having a plurality of teeth, a yoke, and grooves located between the teeth and the yoke; a plurality of permanent magnets that lie adjacent to one another with alternating polarity on an iron plate, wherein the plurality of permanent magnets are spaced apart from the sheet metal via an air gap; and a multi-phase tooth coil winding that is arranged in the grooves, wherein adjacent tooth coils are connected to form groups having an identical electrical phase, wherein adjacent teeth of the groups of tooth coils having an identical electrical phase are connected in a magnetically conductive manner via the yoke.

20 . The dynamo-electric machine of claim 19 , wherein the yoke is interrupted between adjacent tooth coils having a different electrical phase.

Assignees

• Schaeffler Technologies Ag

Inventors

• Kegeler Jörg
• Spörer André

Classifications

• H02K41/031

  of the permanent magnet type · CPC title

• H02K3/26 Primary

  consisting of printed conductors · CPC title

• H02K29/03 Primary

  with a magnetic circuit specially adapted for avoiding torque ripples or self-starting problems · CPC title

• H02K21/24

  with magnets axially facing the armatures, e.g. hub-type cycle dynamos · CPC title

• H02K2203/03

  Machines characterised by the wiring boards, i.e. printed circuit boards or similar structures for connecting the winding terminations · CPC title