CN110831884A

CN110831884A - Traction machine for elevator

Info

Publication number: CN110831884A
Application number: CN201780092799.3A
Authority: CN
Inventors: 桃木新平
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2017-07-07
Filing date: 2017-07-07
Publication date: 2020-02-21
Also published as: JPWO2019008761A1; JP6712094B2; WO2019008761A1

Abstract

The winding housing portion of the stator housing has a thickness substantially equal to a thickness of the stator exciting portion in an axial direction of the rotating shaft. On the other hand, a recess concentric with the rotation axis is formed in the stator near the rotation axis, i.e., in the center. The winding accommodating portion is provided with: an inner cylindrical surface which is a surface facing an outer diameter portion of the sheave; and an outer cylindrical surface located on a side away from the sheave in parallel with the inner cylindrical surface. In addition, the inner cylindrical surface of the stator housing is located between the stator and the sheave. The sheave is accommodated in the recess. Therefore, a part of the sheave and a part of the stator are provided to overlap in the radial direction of the sheave.

Description

Traction machine for elevator

Technical Field

The present invention relates to an elevator hoist including an axial gap motor.

Background

An elevator hoisting machine for winding up an elevator rope suspending a car, a counterweight, or the like of an elevator is known. Generally, such a hoisting mechanism for an elevator includes: a motor; a stator housing that houses a stator of the motor; and a sheave rotatably fixed to a rotating shaft of the motor, and winding up the suspended elevator rope.

In the elevator hoisting machine described in patent document 1, the sheave is formed integrally with the rotor of the motor. Further, a stator winding of the motor is supported by the stator case and opposed to the rotor winding on the radially outer side of the sheave.

In the elevator hoisting machine described in patent document 2, a part of a stator housing of a motor and a sheave are overlapped in a radial direction of the sheave. Thus, the thickness of the elevator hoisting machine in the axial direction of the rotating shaft of the motor is reduced by the thickness of the stator housing.

Documents of the prior art

Patent document

Patent document 1: japanese laid-open patent publication No. 7-137962

Patent document 2: japanese patent application laid-open No. 2010-143661

Disclosure of Invention

Problems to be solved by the invention

However, in the elevator hoisting machine described in patent document 1, the arrangement of the braking device is not clear, and if the braking device is arranged in parallel with the rotor in the axial direction of the rotating shaft of the motor, the thickness of the elevator hoisting machine in the axial direction of the rotating shaft of the motor becomes large.

In the elevator hoisting machine described in patent document 2, even if the stator housing is configured such that a part thereof overlaps the sheave in the radial direction of the sheave, the thickness of the stator housing is generally about 10mm, and there is a problem that the effect of reducing the thickness of the elevator hoisting machine in the axial direction of the rotating shaft of the motor is small.

The present invention has been made to solve the above problems, and an object of the present invention is to provide an elevator hoisting machine configured so that the thickness of the motor in the axial direction of the rotating shaft is not increased.

Means for solving the problems

In order to solve the above problem, an elevator hoist according to the present invention includes: an axial gap motor having a rotor and a stator opposed to each other in an axial direction of the rotor; and a sheave that is rotatable together with the rotor and around which an elevator rope is wound, wherein the stator has a recess on a radially inner side, the sheave is disposed in the recess, and at least a part of the sheave and at least a part of the stator overlap in a radial direction of the sheave.

Effects of the invention

In the elevator hoisting machine according to the present invention, the stator has a recess on the radially inner side, the sheave is disposed in the recess, and at least a part of the sheave and at least a part of the stator overlap in the radial direction of the sheave, so that the thickness of the sheave in the axial direction of the rotating shaft of the motor can be prevented from increasing.

Drawings

Fig. 1 is a front view of an elevator hoisting machine according to an embodiment of the present invention.

Fig. 2 is a cross-sectional view of the elevator hoist taken along line II-II of fig. 1.

Fig. 3 is a cross-sectional view of the lower half of the elevator hoist taken along line III-III of fig. 1.

Fig. 4 is a cross-sectional view of a modification of the elevator hoisting machine shown in fig. 2 according to the embodiment of the present invention.

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Fig. 1 is a front view of an elevator hoisting machine according to embodiment 1 of the present invention, and fig. 2 is a cross-sectional view of the elevator hoisting machine shown in fig. 1 cut along section line II-II.

Referring to fig. 1, an elevator hoisting machine 10 provided in an upper portion of a hoistway of an elevator, not shown, is provided with a motor 20 and a sheave 30, and the sheave 30 is formed to have a smaller diameter than an outer shape of the motor 20. The upper side of fig. 1 is referred to as the upper side of the elevator hoisting machine 10. The motor 20 includes a stator 40, a rotor 50, and a rotary shaft 60. In fig. 1, the rotor 50 is shown by a broken line since it is shielded by the stator case 41 that houses the stator 40.

The sheave 30 is accommodated in a recess 42, which will be described in detail later, and the recess 42 is formed in a central portion of the stator 40, i.e., radially inward, concentrically with the rotary shaft 60. Further, a rotating shaft 60 is rotatably joined to the center of the sheave 30. That is, the sheave 30 can rotate together with the rotor 50. An elevator rope 70 for suspending a car and a counterweight for an elevator, not shown, is suspended on the sheave 30. The elevator rope 70 is impregnated with lubricating oil.

The stator 40 has a stator exciting portion 43, and the stator exciting portion 43 is positioned radially outward of the sheave 30, i.e., radially outward of the recess 42, and is formed in an annular shape as a whole. The stator exciting section 43 is formed by annularly arranging a plurality of stator cores 45 around which stator windings 44 are wound. A portion of the stator housing 41 that accommodates the stator exciting portion 43 is referred to as a winding accommodating portion 46. A 1 st cutout 47a and a 2 nd cutout 47b, which are formed by cutting out a part of the stator exciting portion 43 together with the winding accommodating portion 46 in the vertical direction of the stator 40, are formed below the stator 40. The 1 st notch 47a and the 2 nd notch 47b constitute notch portions. The stator exciting portion 43 is not formed in a complete ring shape but formed in a shape in which a part of the ring shape is missing, due to the 1 st notch 47a and the 2 nd notch 47 b. The elevator rope 70 is disposed in the 1 st notch 47a and the 2 nd notch 47 b.

Two brake devices 80 supported by an unillustrated mounting member are provided on the outer sides of the stator 40 and the rotor 50.

As shown in fig. 2, the rotor 50 and the stator 40 are disposed to face each other in the axial direction of the rotary shaft 60. The rotor 50 is provided with a rotor magnet 51, and the rotor magnet 51 is a permanent magnet disposed annularly so as to face the stator field excitation portion 43. That is, the motor 20 is an axial gap motor in which the stator 40 and the rotor 50 are disposed to face each other in the axial direction of the rotary shaft 60. Further, the outer peripheral surface of the rotor 50 also serves as the braking surface 52 of the brake drum, and the rotor 50 is braked by the brake shoe 81 of the brake device 80 being pressed against the braking surface 52.

In the stator housing 41, the winding accommodating portion 46 supports the stator exciting portion 43. The winding accommodating portion 46 forms a space 48 having a thickness slightly larger than the thickness of the stator field excitation portion 43 in the axial direction of the rotating shaft 60. That is, the winding accommodating portion 46 has a thickness substantially equal to the thickness of the stator field excitation portion 43 in the axial direction of the rotating shaft 60. The winding housing portion 46 is formed with: an inner cylindrical surface 41b which is a surface facing the outer diameter portion 32 of the sheave 30; and an outer cylindrical surface 41c located on a side away from the sheave 30 in parallel with the inner cylindrical surface 41 b.

On the other hand, in the vicinity of the rotating shaft 60 in the stator 40, the stator housing 41 is formed along the radial direction of the rotor 50, and a non-housing portion 49 is formed so as to be thinner than the thickness of the winding housing portion 46 in the axial direction of the rotating shaft 60. A recess 42 concentric with the rotary shaft 60 is formed in the stator 40 near the rotary shaft 60 by the non-housing portion 49 and the inner cylindrical surface 41 b. That is, the recess 42 is formed by the non-housing portion 49 and the inner cylindrical surface 41 b. Further, the inner cylindrical surface 41b is positioned between the stator 40 and the sheave 30. Further, a groove 31 formed in a circumferential direction for winding the elevator rope 70 is provided in the outer diameter portion 32 of the sheave 30.

As described above, the sheave 30 is accommodated in the recess 42. Therefore, a part of the sheave 30 and a part of the winding accommodating portion 46 are provided to overlap in the radial direction of the sheave 30. Thereby, a part of the sheave 30 and a part of the stator 40 are provided to overlap in the radial direction. As described above, the brake device 80 is provided outside the stator 40 and the braking surface 52. Thereby, a part of the stator 40 and the rotor 50 are provided to overlap the brake device 80 in the radial direction. Therefore, the elevator hoisting machine 10 of the present embodiment is thinner in the axial direction of the rotating shaft 60 than an elevator hoisting machine in which the sheave 30 and the stator 40 are not provided to overlap in the radial direction. The elevator hoisting machine 10 according to this embodiment is thinner in the axial direction of the rotating shaft 60 than an elevator hoisting machine in which the stator 40 and the rotor 50 are not provided to overlap the braking device 80 in the radial direction.

In addition, in the elevator hoisting machine described in patent document 1 in which the stator and the rotor are provided outside the sheave in the radial direction without shielding, there is a concern that lubricating oil impregnated in the elevator rope is scattered by the rotation of the sheave, and the brake braking surfaces of the stator and the rotor are contaminated. On the other hand, the elevator hoisting machine 10 of the present embodiment includes an inner cylindrical surface 41b between the stator 40 and the sheave 30, and the sheave 30 is accommodated in the recess 42. Therefore, even if oil is scattered from the elevator rope 70 by the rotation of the sheave 30, the oil is blocked by the inner cylindrical surface 41 b. Therefore, the brake surface 52 of the stator 40 and the rotor 50 can be prevented from being contaminated by oil.

Fig. 3 is a cross section of the lower half of the elevator hoisting machine 10 shown in fig. 1 cut by a cutting line III-III (the stator exciting section 43 and the winding accommodating section 46 which are not located on the line III-III are not shown). The stator field excitation portion 43 is not provided in the cutout portion 47a, and the stator housing 41 outside the recess portion 42 is formed along the radial direction of the rotor 50. Therefore, the elevator ropes 70 are disposed in the cutout portions 47a without colliding with the stator exciting portions 43, and can pass through the cutout portions 47 a. The notch 47b has the same structure.

As described above, the elevator hoisting machine 10 according to the present embodiment includes the motor 20 of the axial gap type, and the motor 20 includes the rotor 50 and the stator 40 facing each other in the axial direction of the rotor 50. Further, the sheave 30 is provided, and the sheave 30 is rotatable together with the rotor 50 and has the elevator rope 70 suspended thereon. The stator 40 has a recess 42 formed in a central portion thereof concentrically with the rotary shaft 60, the sheave 30 is disposed in the recess 42, and at least a portion of the sheave 30 and at least a portion of the stator 40 overlap each other in a radial direction of the sheave 30. Therefore, the thickness of the rotary shaft 60 of the motor 20 in the axial direction can be prevented from increasing.

The stator 40 includes 1 st and 2

nd cutouts

47a and 47b partially cut out radially outward of the recess 42. The elevator ropes 70 are disposed in the 1 st and 2

nd notches

47a and 47 b. Therefore, even if the sheave 30 and the stator 40 overlap in the radial direction of the sheave 30, the elevator rope 70 does not collide with the stator exciting portion 43, and the elevator rope 70 can be wound around the sheave 30.

The stator 40 includes a stator housing 41, and the stator housing 41 has an inner cylindrical surface 41b facing the outer diameter portion 32 of the sheave 30. Further, the recess 42 has an inner cylindrical surface 41 b. Therefore, even if oil impregnated in the elevator rope 70 is scattered by the rotation of the sheave 30, the scattered oil is caught by the inner cylindrical surface 41b of the stator housing 41 constituting the recess 42 and is prevented. Therefore, the oil of the elevator rope 70 is not splashed to the braking surfaces 52 of the stator 40 and the rotor 50, and these devices can be prevented from being contaminated by the oil.

Further, since the inner cylindrical surface 41b is formed in the stator housing 41, the size of the recess 42 in the radial direction can be freely changed by replacing the stator housing with a different position of the inner cylindrical surface 41 b. For example, as shown in fig. 4, when the sheave 30a having a smaller radius than the diameter of the sheave 30 of the embodiment is used, the stator housing 41a having the inner cylindrical surface 41b with the recess 42a having a smaller diameter than the recess 42 of the embodiment is replaced so as to fit the sheave 30 a. Therefore, in the same elevator hoisting machine 10, it is possible to use sheaves having different diameters such as the sheaves 30 and 30a only by replacing the stator housings 41 and 41a, for example.

In the present embodiment, as shown in fig. 1, the 1 st and 2

nd notches

47a and 47b are provided below the stator 40, but the positions, shapes, and the number of notches may be any number. In the embodiment, the outer peripheral surface of the rotor 50 also serves as the braking surface 52, and the two braking devices 80 are provided on the outer side, but the brake drum, the braking surface 52, and the braking devices 80 may have any other configurations.

Description of the reference symbols

10: a traction machine for an elevator; 20: a motor; 30. 30 a: a sheave; 32: an outer diameter portion; 40: a stator; 41. 41 a: a stator housing; 41 b: an inner cylinder surface; 42. 42 a: a recess; 47 a: 1 st cut (cut); 47 b: 2 nd cut (cut); 50: and a rotor.

Claims

1. An elevator hoist is provided with:

an axial gap motor having a rotor and a stator opposed to each other in an axial direction of the rotor; and

a sheave rotatable together with the rotor and capable of winding an elevator rope,

the stator has a recess on the radially inner side,

the sheave is disposed in the recess, and at least a part of the sheave and at least a part of the stator overlap in a radial direction of the sheave.

2. The hoisting machine for an elevator according to claim 1, wherein,

the stator includes a cutout portion formed by cutting out a portion of the stator radially outside the recess portion,

the elevator rope is disposed in the cut portion.

3. The hoisting machine for elevator according to claim 1 or 2, wherein,

the stator is provided with a stator housing,

the stator housing has an inner cylindrical surface that faces an outer diameter portion of the sheave and constitutes the recess.