JPWO2023032134A5

JPWO2023032134A5 -

Info

Publication number: JPWO2023032134A5
Application number: JP2023544922A
Authority: JP
Filing date: 2021-09-02
Publication date: 2024-03-26

Description

本開示の電動機は、軸線を中心とする環状のステータコアと、ステータコアに分布巻で巻かれた３相の巻線とを有するステータと、ステータコアの内側に配置されたロータコアと、ロータコアに埋め込まれてＰ個（Ｐは偶数）の磁極を構成する永久磁石とを有するロータとを備える。ステータコアは、軸線を中心とする周方向に複数のスロットを有する。３相の巻線はいずれも、直列に接続されたＰ／２個の内層コイルと、直列に接続されたＰ／２個の外層コイルとを並列に接続したものである。内層コイルは、軸線を中心とする径方向において外層コイルよりも内側に位置する。内層コイルおよび外層コイルのうち、周方向に隣り合う内層コイルおよび外層コイルは、複数のスロットのうちの１つスロットを通って周方向の両側に延在する。ロータコアの軸線の方向の長さＨｒは、ステータコアの軸線の方向の長さＨｓよりも長い。内層コイルおよび外層コイルはいずれも、ロータコアから軸線の方向に突出して径方向においてロータコアに対向するコイルエンドを有する。ロータコアから内層コイルのコイルエンドまでの距離は、ロータコアから外層コイルのコイルエンドまでの距離よりも短い。 The electric motor of the present disclosure includes a stator having an annular stator core centered on an axis, a three-phase winding wound around the stator core in a distributed manner, a rotor core disposed inside the stator core, and a stator embedded in the rotor core. and a rotor having permanent magnets forming P magnetic poles (P is an even number) . The stator core has a plurality of slots in the circumferential direction around the axis. Each of the three-phase windings has P/2 inner layer coils connected in series and P/2 outer layer coils connected in series, connected in parallel. The inner layer coil is located inside the outer layer coil in a radial direction centered on the axis. Of the inner layer coil and outer layer coil, the inner layer coil and outer layer coil that are adjacent to each other in the circumferential direction extend through one of the plurality of slots on both sides in the circumferential direction. The length Hr of the rotor core in the axial direction is longer than the length Hs of the stator core in the axial direction. Both the inner layer coil and the outer layer coil have coil ends that protrude from the rotor core in the axial direction and face the rotor core in the radial direction. The distance from the rotor core to the coil end of the inner layer coil is shorter than the distance from the rotor core to the coil end of the outer layer coil.

Claims

A stator having an annular stator core centered on an axis, and three-phase windings wound around the stator core in a distributed manner;
A rotor having a rotor core disposed inside the stator core, and a permanent magnet embedded in the rotor core and forming P magnetic poles (P is an even number) ;
Equipped with
The stator core has a plurality of slots in a circumferential direction centered on the axis,
Each of the three-phase windings is a parallel connection of P/2 inner layer coils connected in series and P/2 outer layer coils connected in series,
The inner layer coil is located inside the outer layer coil in a radial direction centered on the axis,
Of the inner layer coil and the outer layer coil, the inner layer coil and the outer layer coil that are adjacent to each other in the circumferential direction extend on both sides in the circumferential direction through one slot of the plurality of slots,
A length Hr of the rotor core in the direction of the axis is longer than a length Hs of the stator core in the direction of the axis,
Each of the inner layer coil and the outer layer coil has a coil end that protrudes from the rotor core in the direction of the axis and faces the rotor core in the radial direction,
The distance from the rotor core to the coil end of the inner layer coil is shorter than the distance from the rotor core to the coil end of the outer layer coil.
Electric motor.

The electric motor according to claim 1, wherein the rotor core protrudes from the stator core on both sides in the direction of the axis.

The rotor core has a first core portion facing the stator core in the radial direction, and a second core portion protruding from the stator core in the radial direction,
The first core portion has a slit outside the permanent magnet in the radial direction,
The electric motor according to claim 1 or 2 , wherein the second core part does not have a slit outside the permanent magnet in the radial direction.

The three-phase winding includes a first phase winding, a second phase winding, and a third phase winding,
The first phase winding is arranged at the innermost position in the radial direction,
The second phase winding is arranged at the outermost position in the radial direction,
The electric motor according to any one of claims 1 to 3, wherein the third phase winding is arranged between the first phase winding and the second phase winding in the radial direction. .

The electric motor according to any one of claims 1 to 4 , wherein a length Hm of the permanent magnet in the axial direction is greater than or equal to a length Hs of the stator core in the axial direction.

The electric motor according to any one of claims 1 to 4 , wherein a length Hm of the permanent magnet in the axial direction is shorter than a length Hs of the stator core in the axial direction.

The electric motor according to any one of claims 1 to 6 , wherein the electric motor has a winding coefficient of 1.

The electric motor according to any one of claims 1 to 7 , wherein the permanent magnet is a rare earth magnet.

The electric motor according to any one of claims 1 to 8 ,
A compressor comprising: a compression mechanism driven by the electric motor.

A refrigeration cycle device comprising the compressor according to claim 9 , a condenser, a pressure reducing device, and an evaporator.