Winding for a rotating electrical machine and method for designing such a winding

Patent metadata

Field	Value
Publication number	US-2016164358-A1
Application number	US-201414900055-A
Country	US
Kind code	A1
Filing date	Jun 27, 2014
Priority date	Jun 27, 2013
Publication date	Jun 9, 2016
Grant date	—

Abstract

The invention provides a winding ( 40 ) for a rotating electrical machine ( 1 ) comprising a flexible PCB ( 45 ) having a plurality of conductors ( 60 ) on a first surface and a plurality of conductors ( 60 ) on a second surface, said conductors having a shape optimizing the performance of the machine, and a method for designing such a winding.

First claim

1 - 15 . (canceled)

16 . A winding for a rotating electrical machine, said machine comprising an inductor, an iron core, and an air gap in between, said winding comprising a flexible PCB having a plurality of conductors on a first surface and a plurality of conductors on a second surface of a substrate, said conductors being tracks printed on said PCB, a conductor of the first surface being connected through a via to a conductor of the second surface so as to form a turn, said PCB having an height and a length, such that when rolled up one or more times, in one or more layers, along the length, it is adapted for inserting into said air gap in an axial direction, wherein a conductor has a shape extending from a bottom height of said flexible PCB to a top height of said PCB in an axial direction, along a continuous curve or a number n of rectilinear segments, n being larger than 3.

17 . The winding according to claim 16 wherein said conductor has a variable width such that the gap between a conductor and a neighbouring conductor is equal to a predetermined constant along the length of said conductor.

18 . The winding according to claim 16 wherein said conductor extends along a number n of rectilinear segments, n being larger than 6 and smaller than or equal to 100.

19 . The winding according to any claim 16 , wherein said conductors have a line symmetric shape, the symmetry axis being a line along the length of the PCB, at mid-height of the PCB.

20 . The winding according to claim 19 , wherein a plurality of turns are connected in series so as to form a coil.

21 . The winding according to claim 20 , wherein a conductor on the first surface of one turn is extended along its length and connected through a via to a conductor on the second surface, having a corresponding extension, so as to form a connection between two successive turns of said coil, the two successive turns being at a distance in the length direction.

22 . The winding according to claim 20 , wherein said plurality of turns is a number t of turns, conductors of the first surface being numbered from 1 to t in the length direction, conductors of the second surface being also numbered from 1 to t in the length direction, and conductor i on the first surface being connected at the upper end of the PCB to conductor t-i of the second surface through a track extending along the length direction of the PCB, at decreasing heights, for i=1 to i=t-1;
and conductor i on the first surface being connected at the lower end of the PCB to conductor t-i+1 of the second surface through a track extending along the length direction of the PCB, at increasing heights, for i=1 to i=t.

23 . The winding according to claim 22 wherein said tracks extending along the length of the PCB are located on both the first and the second surface of the PCB.

24 . The winding according to claim 23 wherein a plurality of vias are connecting said corresponding tracks on the first and second surface of the PCB.

25 . The winding according to claim 16 , wherein said conductors have point symmetric shape, the reflection point being at mid-height of the PCB.

26 . The winding according to claim 25 , wherein a plurality of turns are connected in series and forming a series of turns.

27 . The winding according to claim 26 , wherein a plurality of series of turns are arranged successively at a distance in the length direction, a conductor on the first surface of one turn of one series is extended along its length and connected through a via to a conductor of a successive series on the second surface, having a corresponding extension, so as to form a connection between two successive series, the two successive series being at a distance in the length direction.

28 . The winding according to claim 26 , wherein a plurality of series of turns are arranged successively at a distance in the length direction
said plurality of series is a number t of series, adjacent conductors being numbered from 1 to t on both the first and second surface, and conductors 1 to t on the first surface are connected at the upper end of the PCB to conductors t to 1 respectively on the second surface through t tracks extending along the length direction of the PCB, at decreasing heights, and conductors 1 to t on the second surface being connected at the lower end of the PCB to conductor t to 1 of the first surface through a track extending along the length direction of the PCB, at increasing heights, except for one of the said plurality of series where conductors 1 to t− 1 on the first surface are connected at the upper end of the PCB to conductors t− 1 to 1 respectively on the second surface through t− 1 tracks extending along the length direction of the PCB, at decreasing heights, conductors t of the first and second surface being connected to terminals.

29 . The winding according to claim 28 wherein said tracks extending along the length of the PCB are located on both the first and the second surface of the PCB.

30 . The winding according to claim 29 wherein a plurality of vias are connecting said corresponding tracks on the first and second surface of the PCB.

31 . The winding according claim 16 wherein said shape is designed for optimizing the ratio k p of the torque constant k T over the square root of the phase resistance R ph of said winding.

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k
p

=

k
T

R

p



h

.

32 . A method for designing a winding for a rotating electrical machine, said machine comprising an inductor, an iron core, and an air gap in between, said winding comprising a flexible PCB having a plurality of conductors on a first surface and a plurality of conductors on a second surface, said conductors being tracks printed on said PCB, a conductor of the first surface being connected through a via to a conductor of the second surface so as to form a turn, said PCB having an height and a length, such that when rolled up one or more times, in one or more layers, along the length, it is adapted for inserting into said air gap in an axial direction,
wherein a conductor extends from a bottom height of said flexible PCB to a top height of said PCB in an axial direction, along a continuous curve or a number n of rectilinear segments, n being larger than 3, and has a variable width such that the gap between a conductor and a neighbouring conductor is equal to a predetermined constant along the length of said conductor, comprising the steps of a) determining the torque constant k T of said rotating electrical machine in dependence of the geometric parameters of the shape of said conductor; b) determining the phase resistance R ph of said winding in dependence of the geometric parameters of the shape of said conductor; c) varying the shape parameter

Assignees

• Univ Catholique Louvain

Inventors

• Dehez Bruno
• Baudart François

Classifications

• H02K3/26 Primary

  consisting of printed conductors · CPC title

• H02K3/28

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

• Y02E10/72

  Wind turbines with rotation axis in wind direction · CPC title