JP2023005548A5

JP2023005548A5 -

Info

Publication number: JP2023005548A5
Application number: JP2021107543A
Authority: JP
Filing date: 2021-06-29
Publication date: 2023-09-15

Description

本発明の一態様では、ティースは、本体部の先端面に、回転軸方向の一端から他端にわたってバックヨーク部側に凹む二つの凹溝（４４１、４４２）が形成されている。二つの凹溝は、回転軸に対して平行に形成されてもよく、回転軸に対して傾斜していてもよい。 In one aspect of the present invention, the teeth are formed with two grooves (441, 442) recessed toward the back yoke portion from one end to the other end in the rotational axis direction on the distal end surface of the main body portion. The two grooves may be formed parallel to the rotation axis or may be inclined to the rotation axis.

周方向に隣接する凹溝の間に対応する位置に、非磁性材料または空間で構成され、隣接する凹溝の間の磁路である流入磁路（４６）を通る磁束を低減する一つの磁束低減部（４５）が設けられている。磁束低減部は、ティースの周方向における長さがティースの径方向における長さよりも長い長円形状に形成されている。磁束低減部を構成する「非磁性材料」には、樹脂やアルミニウム等の非磁性金属が含まれる。「空間」には、板厚方向に貫通する空孔や板厚を局所的に薄くした窪み等が含まれる。 At a position corresponding to between adjacent grooves in the circumferential direction, one groove is made of a non-magnetic material or space and reduces the magnetic flux passing through the inflow magnetic path (46), which is a magnetic path between adjacent grooves. A magnetic flux reduction section (45) is provided. The magnetic flux reducing portion is formed in an elliptical shape in which the length of the teeth in the circumferential direction is longer than the length of the teeth in the radial direction. The "non-magnetic material" constituting the magnetic flux reduction section includes resin and non-magnetic metal such as aluminum. The "space" includes holes penetrating in the thickness direction of the plate, depressions where the plate thickness is locally thinned, and the like.

Claims

A stator (30) has a stator (30) in which a winding (35) is wound around an annular stator core (31), and a plurality of magnets (55) are attached along the outer periphery of a cylindrical rotor core (51). A rotating electric machine in which a rotor (50) that rotates inside the stator due to a rotating magnetic field generated by energizing a wire is disposed coaxially with a rotation axis (O),
The stator core includes a main body part (42) extending radially inward from a back yoke part (41) forming the outer edge of the ring, and a collar part (42) projecting from the main body part to both sides in the circumferential direction at the tip of the main body part. 43) are provided in a plurality of teeth (401-403) in the circumferential direction,
The teeth are
Two grooves (441, 442) recessed toward the back yoke portion from one end in the direction of the rotation axis to the other end are formed on the front end surface of the main body portion,
At positions corresponding between the grooves adjacent in the circumferential direction, there is a member made of a non-magnetic material or a space that reduces the magnetic flux passing through the inflow magnetic path (46), which is a magnetic path between the adjacent grooves . Two magnetic flux reduction parts (45) are provided,
In the rotating electric machine, the magnetic flux reducing portion is formed in an oval shape in which the length of the teeth in the circumferential direction is longer than the length of the teeth in the radial direction.

The rotating electric machine according to claim 1 , wherein the length of the magnetic flux reducing portion in the circumferential direction of the teeth is longer than the width of the inflow magnetic path (46).

The total width of the two outflow magnetic paths (471, 472), which are magnetic paths from the inflow magnetic path to the back yoke section via both sides of the magnetic flux reduction section, is smaller than the width of the inflow magnetic path. The rotating electric machine according to claim 1 or 2, configured as follows.

If the angle between the circumferential centers of the two grooves and the rotation axis is θg, then when the number of teeth is 12, the angle between the grooves is:
7°＜θg＜9°
The rotating electrical machine according to any one of claims 1 to 3, which is configured to:

A stator (30) has a stator (30) in which a winding (35) is wound around an annular stator core (31), and a plurality of magnets (55) are attached along the outer periphery of a cylindrical rotor core (51). A rotating electrical machine in which a rotor (50) that rotates inside the stator due to a rotating magnetic field generated by energizing a wire is disposed coaxially with a rotation axis (O),
The stator core includes a main body part (42) extending radially inward from a back yoke part (41) forming the outer edge of the ring, and a collar part (42) projecting from the main body part to both sides in the circumferential direction at the tip of the main body part. A plurality of teeth (404) having 43) are provided in the circumferential direction,
The teeth are
A plurality of concave grooves (445-448) are formed on the distal end surface of the main body portion from one end to the other end in the direction of the rotation axis and recessed toward the back yoke portion,
A non-magnetic material or a space is formed at a position corresponding to between the grooves adjacent to each other in the circumferential direction to reduce the magnetic flux passing through the inflow magnetic path (461-463) which is a magnetic path between the adjacent grooves. A total of two or more magnetic flux reduction units (455-458) are provided corresponding to the inflow magnetic path , and
The magnetic flux reduction part is a rotating electric machine formed in a circular shape .

The teeth are
The four grooves, the first groove (445), the second groove (446), the third groove (447), and the fourth groove (448) arranged in order in the circumferential direction;
A first magnetic flux reducing portion (455) provided corresponding to the inflow magnetic path (461) between the first groove and the second groove, the second groove and the third groove; a second magnetic flux reducing portion (456) and a third magnetic flux reducing portion (457) provided corresponding to the inflow magnetic path (462) between the third groove and the fourth groove; and four magnetic flux reducing parts, a fourth magnetic flux reducing part (458) provided corresponding to the inflow magnetic path (463),
The total width of the plurality of outflow magnetic paths (481-487), which are magnetic paths from each of the inflow magnetic paths to the back yoke section via both sides of the corresponding magnetic flux reduction section, is the sum of the widths of the plurality of outflow magnetic paths (481-487). The rotating electrical machine according to claim 5 , wherein the rotating electrical machine is configured to be smaller than the total width.

The teeth are formed symmetrically with respect to a symmetry axis (V) passing through the rotation axis in each cross section perpendicular to the rotation axis,
Any one of claims 1 to 6 , wherein the plurality of grooves and the one or more magnetic flux reducing portions are arranged symmetrically with respect to the axis of symmetry of the teeth in each cross section perpendicular to the rotation axis. The rotating electric machine described in .

The teeth have the two grooves (441, 442),
In each cross section perpendicular to the rotation axis, the width of the inflow magnetic path (46) between the two grooves is equal to the width of the corner of the groove on the side away from the axis of symmetry and the circumferential end of the flange. The rotating electrical machine according to claim 7 , wherein the rotating electrical machine is formed to have a width shorter than the width of the magnetic path (49) between the parts.

The stator core has a plurality of substator cores in which the grooves extend parallel to the rotation axis, and the substator cores have n stages (n ≧2) It has a step skew structure,
Let k be the least common multiple of the number of magnets and the number of teeth of the rotor, and let θsd be the groove stage skew angle between the grooves of adjacent stages around the rotation axis,
0<θsd≦360°÷k÷n
The rotating electric machine according to any one of claims 1 to 8 , which is configured so that:

The stator core has a linear skew structure in which the groove is inclined at a constant angle with respect to the rotation axis,
Let k be the least common multiple of the number of magnets and the number of teeth of the rotor, and let θsL be the groove linear skew angle between one end and the other end of the groove, centering on the rotation axis,
0<θsL≦360°÷k
The rotating electric machine according to any one of claims 1 to 8 , which is configured so that:

The rotor core has a plurality of sub-rotor cores in which the magnets extend parallel to the rotation axis, and the sub-rotor cores have n stages (n≧2) in which the circumferential position of the magnet is shifted in a predetermined direction according to the position of each stage. ) has a step skew structure,
Let k be the least common multiple of the number of magnets and the number of teeth of the rotor, and let ψsd be the magnet stage skew angle between the magnets of adjacent stages around the rotation axis,
0＜ψsd≦360°÷k÷n
The rotating electrical machine according to any one of claims 1 to 8 , which is configured to:

The rotor core has a linear skew structure in which the magnets are inclined at a constant angle with respect to the rotation axis,
Let k be the least common multiple of the number of magnets and the number of teeth of the rotor, and let ψsL be the magnet linear skew angle between one end and the other end of the magnets around the rotation axis,
0＜ψsL≦360°÷k
The rotating electric machine according to any one of claims 1 to 8 , which is configured so that:

The rotating electrical machine according to any one of claims 1 to 12 , wherein the plurality of grooves are formed radially around the rotating shaft.

The teeth are formed symmetrically with respect to a symmetry axis (V) passing through the rotation axis in each cross section perpendicular to the rotation axis,
The rotating electrical machine according to any one of claims 1 to 12 , wherein the plurality of grooves are formed parallel to the axis of symmetry of the teeth.