CN110178287B

CN110178287B - Rotating electrical machine and elevator hoist provided with same

Info

Publication number: CN110178287B
Application number: CN201780077922.4A
Authority: CN
Inventors: 冈本健
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2017-01-19
Filing date: 2017-01-19
Publication date: 2020-12-01
Anticipated expiration: 2037-01-19
Also published as: JPWO2018134948A1; JP6676195B2; WO2018134948A1; CN110178287A

Abstract

The rotating electric machine of the present invention includes: a stator; and a rotor disposed opposite to the stator in the same direction as the central axis of the stator and rotating around the central axis. The stator has: inner teeth; outer teeth provided on the outer peripheral side of the inner teeth; an inner layer winding; and an outer winding. The inner layer winding is wound on the outer teeth with the same direction as the central axis as the axis, and the outer layer winding is wound on the inner layer winding and the inner teeth with the same direction as the central axis as the axis.

Description

Rotating electrical machine and elevator hoist provided with same

Technical Field

The present invention relates to an axial gap type rotating electrical machine in which a rotor and a stator are opposed to each other in the same direction as a central axis of rotation of the rotor, and an elevator hoisting machine including the rotating electrical machine.

Background

In recent years, a rotating electric machine is required to be downsized and highly efficient. An axial gap type rotating electrical machine is also one option that can meet this requirement.

The efficiency of the rotating electric machine is proportional to the area of the teeth and the electrical load represented by the product of the current value per unit length and the number of windings. In the axial gap type rotating electrical machine, the length of the inner peripheral side of the teeth is shorter than the length of the outer peripheral side. Therefore, if the teeth are rectangular, a gap is formed on the outer peripheral side. Therefore, in order to reduce the gap between teeth on the outer peripheral side, it is necessary to form the teeth into a trapezoidal shape having a long outer peripheral side. However, if the teeth are trapezoidal, the electrical load decreases on the outer peripheral side of the teeth.

Patent document 1 describes a stator structure including: the planar shape of the teeth is made trapezoidal, the 1 st winding is wound around the entire teeth, and the 2 nd winding is wound so as to overlap the outer peripheral side of the teeth, so that the number of windings increases, thereby increasing the electrical load on the outer peripheral side of the teeth.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2005-287216

Disclosure of Invention

Problems to be solved by the invention

However, in the structure of the stator described in patent document 1, as shown in fig. 1(b) and 3, the 2 nd winding and the 1 st winding are wound so as to overlap each other on the outer peripheral side of the teeth, so that the number of windings increases. On the other hand, the 2 nd winding is wound at a position different from the 1 st winding by thickening the teeth in the central axis direction on the inner peripheral side of the teeth.

The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a stator coil in which the thickness of teeth is not increased and an electric load on the outer circumferential side of the teeth is not damaged.

Means for solving the problems

The rotating electric machine of the present invention includes: a stator; and a rotor disposed opposite to the stator in the same direction as a central axis of the stator and rotating around the central axis, wherein the stator includes: inner teeth; outer teeth provided on the outer peripheral side of the inner teeth; an inner layer winding; and the outer layer winding takes the same direction as the central axis as an axis and is wound on the outer side teeth, and the outer layer winding takes the same direction as the central axis as an axis and is wound on the inner layer winding and the inner side teeth.

Effects of the invention

Thus, in the coil of the stator, the thickness of the teeth is not increased, and the electric load on the outer peripheral side of the teeth is not damaged.

Drawings

Fig. 1 is a diagram schematically showing a cross section of a motor part of an elevator hoisting machine according to embodiment 1 of the present invention.

Fig. 2 is a perspective view of the stator in fig. 1.

Fig. 3 is a perspective view of the stator of fig. 2 before the windings are provided.

Fig. 4 is a top view of the stator of fig. 3 with one slot removed.

Fig. 5 is a plan view of fig. 4 after the inner layer winding is disposed.

Fig. 6 is a plan view of fig. 5 after the outer layer winding is provided.

Fig. 7 is a sectional view of an inner tooth in embodiment 2 of the present invention.

Fig. 8 is a sectional view of an outer tooth in embodiment 2 of the present invention.

Fig. 9 is a cross-sectional view of a modification of the outer teeth in embodiment 2.

Detailed Description

Hereinafter, embodiments of a rotating electric machine according to the present invention will be described with reference to the drawings. In the drawings, the same or corresponding portions are denoted by the same reference numerals, and redundant description thereof will be omitted.

Embodiment 1.

Fig. 1 is a schematic cross-sectional view of a motor unit 100 of an elevator hoisting machine according to embodiment 1 of the present invention. The motor unit 100 is an axial gap type rotating electrical machine.

As shown in fig. 1, a stator 2 is provided in the housing 20. A rotor 1 is provided above the stator 2 so as to face the stator 2. The rotor 1 rotates about the central axis C of the stator 2. The rotor 1 includes a rotating body 10 and a permanent magnet 11. The permanent magnet 11 is provided on the lower surface of the rotating body 10.

Fig. 2 is a perspective view of the stator 2 in fig. 1. The stator 2 has a plurality of slots 7 arranged in the circumferential direction around the center axis C. One of the grooves 7 has the inner teeth 3 on the side close to the center axis C in the radial direction, i.e., on the inner circumferential side. The groove 7 has outer teeth 4 on the side radially away from the center axis C, i.e., on the outer peripheral side. The inner teeth 3 and the outer teeth 4 are each a substantially quadrangular prism having a shape of a surface facing the rotor 1, that is, a planar shape of a trapezoid.

Furthermore, the stator 2 has an inner winding 5 and an outer winding 6. The inner layer winding 5 is wound around the outer teeth 4 with the same direction as the central axis C as an axis. The outer layer winding 6 is wound around the inner layer winding 5 and the inner teeth 3 with the same direction as the central axis C as an axis. The inner winding 5 and the outer winding 6 may be connected in series or in parallel.

A method of forming the stator 2 shown in fig. 2 will be described with reference to fig. 3 to 6. In these figures, the windings are hatched for ease of visualization.

Fig. 3 is a perspective view of the stator 2 before the winding is provided. The stator 2 has inner teeth 3 on the inner circumferential side, and outer teeth 4 on the outer circumferential side of the inner teeth 3. A top view with one of the slots 7, i.e. a set of inner teeth 3 and outer teeth 4, removed is fig. 4. As shown in fig. 4, each of the inner teeth 3 and the outer teeth 4 has a trapezoidal planar shape, and the outer periphery is longer than the inner periphery.

First, as shown in fig. 5, the inner layer winding 5 is wound around the outer teeth 4 with the same direction as the central axis C as the axis. The side surface 5s of the inner layer winding 5 wound around the outer teeth 4 is coplanar with the side surface 3s of the inner teeth 3. For this purpose, the number of turns of the inner layer winding 5, the shape of the inner teeth 3, and the shape of the outer teeth 4 are predetermined.

Next, as shown in fig. 6, the outer-layer winding 6 is wound around the inner teeth 3 and the inner-layer winding 5 with the same direction as the central axis C as an axis. The outer layer winding 6 is wound on the outer peripheral surface 5c of the inner layer winding 5 in an overlapping manner so that the number of winding turns increases on the outer peripheral edge 4a side of the outer teeth 4.

In this way, the stator 2 includes the inner teeth 3, the outer teeth 4 provided on the outer peripheral side of the inner teeth 3, the inner coil 5, and the outer coil 6. The inner layer winding 5 is wound around the outer teeth 4 with the same direction as the central axis C as an axis. The outer layer winding 6 is wound around the inner layer winding 5 and the inner teeth 3 with the same direction as the central axis C as an axis. The outer winding 6 is wound from above the inner winding 5.

Thus, the coil of the stator 2 can be configured such that the electrical load on the outer peripheral side of the teeth is not damaged without increasing the thickness of the teeth.

When the outer layer winding 6 is wound, the side surface 5s of the inner layer winding 5 is flush with the side surface 3s of the inner teeth 3 located adjacent thereto. This can suppress the occurrence of a gap between the outer layer winding 6 and the inner layer winding 5 or the inner teeth 3, and reduce the influence of the gap on the leakage flux.

Further, in the case of dividing the teeth of one slot 7 into two, the inner teeth 3 and the outer teeth 4, the windings can be provided individually to the respective teeth. However, in such a case, the windings of the inner teeth 3 and the windings of the outer teeth 4 must be inserted into the gaps 34 between the inner teeth 3 and the outer teeth 4.

On the other hand, when the inner-layer winding 5 and the outer-layer winding 6 are provided as in embodiment 1, only the inner-layer winding 5 enters the gap 34. Therefore, the gap 34 can be reduced. Therefore, the influence of the leakage flux can be reduced, and the reduction in the area of the planar shape of the teeth can be suppressed.

Further, the position of the gap 34 between the inner teeth 3 and the outer teeth 4 may be moved in the radial direction according to the ratio of the number of turns of the inner winding 5 to the number of turns of the outer winding 6. Accordingly, a high-efficiency rotating electric machine can be obtained.

The outer-layer winding 6 is wound around the inner teeth 3 and is wound so as to overlap the inner-layer winding 5. Thus, the number of turns of the outer layer winding 6 can be increased or decreased without increasing the thickness of the teeth.

In embodiment 1, the inner layer winding 5 is provided for all the outer teeth 4, and then the outer layer winding 6 is provided for all the slots 7. Without being limited thereto, the following order may also be adopted: the inner layer winding 5 and the outer layer winding 6 are continuously provided for one slot 7, and this is performed sequentially for all the slots 7.

In embodiment 1, the three-dimensional shape of the inner teeth 3 is different from the three-dimensional shape of the outer teeth 4, but may be the same. This can suppress the cost of the mold.

Embodiment 2.

Next, a rotating electric machine according to embodiment 2 will be described with reference to fig. 7 and 8. In embodiment 1, the teeth are substantially quadrangular prisms, but in embodiment 2, the shape is different from that of the teeth of fig. 1.

Fig. 7 shows a circumferential cross-sectional view of the inner teeth 3. A tip end portion 3t of the inner teeth 3 on the side facing the rotor 1, not shown, has a protruding portion 3p having a triangular cross section in the circumferential direction. The distal end portion 3t is longer than the base end portion 3g located on the side not facing the rotor 1.

Fig. 8 shows a circumferential cross-sectional view of the outer teeth 4. The distal end portion 4t of the outer teeth 4 on the side facing the rotor 1, not shown, has an extension portion 4p having a triangular cross section in the circumferential direction. The distal end portion 4t is longer than the base end portion 4g located on the side not facing the rotor 1.

In fig. 7 and 8, the length L4 of the tip portion 4t of the outer teeth 4 is longer than the length L3 of the tip portion 3t of the inner teeth 3. This prevents an increase in magnetic flux leakage due to winding of the inner winding 5 and the outer winding 6.

Further, the outer teeth 4 may have a cross-sectional shape shown in fig. 9.

In embodiments 1 and 2, the teeth are divided into two, i.e., the inner teeth 3 and the outer teeth 4, but may be divided into three or more.

Description of the reference symbols

1: a rotor; 2: a stator; 3: inner teeth; 3 s: side (2 nd side); 4: an outer tooth; 5. 51: an inner layer winding; 5 s: side (1 st side); 6: an outer winding; 100: a motor unit (rotating electric machine); c: a central axis; l3, L4: length.

Claims

1. A rotating electrical machine having: a stator; and a rotor disposed opposite to the stator in the same direction as a central axis of the stator and rotating around the central axis, wherein,

the stator has:

inner teeth;

outer teeth provided on an outer peripheral side of the inner teeth;

an inner layer winding; and

the outer layer of the winding is provided with a winding,

the inner layer winding is wound around the outer teeth with the same direction as the central axis as an axis,

the outer winding is wound around the inner winding and the inner teeth with the same direction as the central axis as an axis.

2. The rotating electric machine according to claim 1,

the inner layer winding wound around the outer teeth has a 1 st side,

the inner teeth have a 2 nd side at a position adjacent to the 1 st side of the inner winding,

the 1 st side surface and the 2 nd side surface are formed to be the same surface.

3. The rotating electric machine according to claim 1 or 2,

with respect to a circumferential length of a tip end portion formed by a protruding portion protruding in a circumferential direction at an end portion of the inner teeth and the outer teeth opposed to the rotor, the length of the outer teeth is longer than the length of the inner teeth.

4. An elevator hoisting machine comprising the rotating electrical machine according to any one of claims 1 to 3.