Electric device and a stator assembly for the electric device

Patent metadata

Field	Value
Publication number	US-2016285334-A1
Application number	US-201514669879-A
Country	US
Kind code	A1
Filing date	Mar 26, 2015
Priority date	Mar 26, 2015
Publication date	Sep 29, 2016
Grant date	—

Abstract

An electric device and a stator assembly for the electric device includes a stator core defining a plurality of slots spaced from each other. The stator assembly includes a plurality of bar conductors disposed in each of the slots and arranged to present a first winding path, a second winding path and a third winding path. A first set of the bar conductors of the first, second and third winding paths are configured to receive current in a parallel circuit arrangement. The stator assembly also includes a plurality of electrical jumpers electrically connected to a predetermined number of the bar conductors such that an amount of current flowing through the first winding path and the third winding path is substantially the same and an amount of current flowing through the second winding path is different from the amount of current flowing through the first and third winding paths.

First claim

1 . A stator assembly for an electric device, the stator assembly comprising:
a stator core defining a plurality of slots spaced from each other; a plurality of bar conductors disposed in each of the slots and arranged to present a first winding path, a second winding path and a third winding path, with a first set of the bar conductors of the first, second and third winding paths configured to receive current in a parallel circuit arrangement; and a plurality of electrical jumpers electrically connected to a predetermined number of the bar conductors such that an amount of current flowing through the first winding path and the third winding path is substantially the same and an amount of current flowing through the second winding path is different from the amount of current flowing through the first and third winding paths.

2 . The assembly as set forth in claim 1 wherein the amount of current flowing through each of the first and third winding paths is greater than the amount of current flowing through the second winding path.

3 . The assembly as set forth in claim 1 wherein the amount of current flowing through each of the first and third winding paths is less than the amount of current flowing through the second winding path.

4 . The assembly as set forth in claim 1 wherein:
the amount of current flowing through the first winding path creates a first waveform, the amount of current flowing through the second winding path creates a second waveform and the amount of current flowing through the third winding path creates a third waveform; and
the first and third waveforms are substantially the same and the second waveform is different from the first and third waveforms.

5 . The assembly as set forth in claim 4 wherein:
the amount of current flowing through each of the first and third winding paths is greater than the amount of current flowing through the second winding path; and
a peak amplitude of the first and third waveforms occurs in time before a peak amplitude of the second waveform such that the first and third waveforms are different from the second waveform.

6 . The assembly as set forth in claim 5 wherein heat being produced in the first and third winding paths is greater than heat being produced in the second winding path due to the amount of current flowing through the first and third winding paths being greater than the amount of current flowing through the second winding path.

7 . The assembly as set forth in claim 4 wherein:
the amount of current flowing through each of the first and third winding paths is less than the amount of current flowing through the second winding path; and
a peak amplitude of the first and third waveforms occurs in time after a peak amplitude of the second waveform such that the first and third waveforms are different from the second waveform.

8 . The assembly as set forth in claim 1 wherein:
the stator core extends between a first end and a second end along a longitudinal axis, and the stator core includes an inner wall defining a hole along the longitudinal axis such that the inner wall is spaced radially away from the longitudinal axis, and wherein the stator core includes an outer wall opposing the inner wall;
the slots are spaced from each other radially about the longitudinal axis and each extends between the first and second ends of the stator core;
each of the slots includes an inner layer of the bar conductors disposed proximal to the inner wall, an outer layer of the bar conductors disposed proximal to the outer wall and spaced from the inner layer and a middle layer of the bar conductors disposed between the inner and outer layers; and
a first one of the electrical jumpers connects the inner and outer layers to form the first winding path, a second one of the electrical jumpers connects the inner and outer layers to form the third winding path and a third one of the electrical jumpers connects the middle layer to form the second winding path.

9 . The assembly as set forth in claim 8 wherein:
the inner layer of each of the slots includes a first layer and a second layer;
the middle layer of each of the slots includes a third layer and a fourth layer,
the outer layer of each of the slots includes a fifth layer and a sixth layer; and
the first, second, third, fourth, fifth and sixth layers are arranged in a row from the inner wall outwardly to the outer wall such that the first layer is disposed proximal to the inner wall and the sixth layer is disposed proximal to the outer wall.

10 . The assembly as set forth in claim 9 wherein:
a first one of the electrical jumpers is secured to the bar conductor of the first layer of one of the slots and the first one of the electrical jumpers is secured to the bar conductor of the sixth layer of another one of the slots to cross the current between the inner and outer layers; and
a second one of the electrical jumpers is secured to the bar conductor of the second layer in the same slot that has the first one of the electrical jumpers secured to the bar conductor of the sixth layer and the second one of the electrical jumpers is secured to the bar conductor of the fifth layer in the same slot that has the first one of the electrical jumpers secured to the bar conductor of the first layer to cross the current between the inner and outer layers.

11 . The assembly as set forth in claim 10 wherein a third one of the electrical jumpers is secured to the bar conductor of the fourth layer in the same slot that has the first one of the electrical jumpers secured to the bar conductor of the sixth layer and the third one of the electrical jumpers is secured to the bar conductor of the third layer in the same slot that has the first one of the electrical jumpers secured to the bar conductor of the first layer.

12 . The assembly as set forth in claim 11 further including a connection support structure having the first one of the electrical jumpers and the second one of the electrical jumpers attached thereto, with the third one of the electrical jumpers being separate from the connection support structure.

13 . The assembly as set forth in claim 12 further including a plurality of first stator connectors attached to the connection support structure and each of the first stator connectors attached to respective first sets of the bar conductors to split the current into the parallel circuit arrangement for the first, second and third winding paths, and wherein one of the first stator connectors splits the current in a U phase, another one of the first stator connectors splits the current in a V phase and another one of the first stator connectors splits the current in a W phase.

14 . An electric device comprising:
a housing; a rotor rotatably supported by the housing; a stator assembly supported by and fixed relative to the housing, with the stator assembly including:
a stator core defining a plurality of slots spaced from each other;
a plurality of bar conductors disposed in each of the slots and arranged to present a first winding path, a second winding path and a third winding path, with a first set of the bar conductors of the first, second and third winding paths configured to receive current in a parallel circuit arrangement; and
a plurality of electrical jumpers electrically connected to a predetermined number of the bar conductors such that an amount of current flowing through the first winding path and the third winding path is substantially the same and an amount of current flowing through the second winding path is different from the amount of current flowing through the first and third winding paths.

Assignees

• Gm Global Tech Operations Llc

Inventors

• Turnbull Paul F
• Kaiser Edward L
• Laba Matthew D
• Rahman Khwaja M
• Blissenbach Rolf

Classifications

• H02K3/28 Primary

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

• H02K3/46

  Fastening of windings on the stator or rotor structure · CPC title

• H02K1/165 Primary

  Shape, form or location of the slots · CPC title

• H02K3/50

  Fastening of winding heads, equalising connectors, or connections thereto · CPC title

• H02K3/12

  arranged in slots · CPC title