JPH11157766A - Hoist - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid changes in the gap between a rotor and a stator regardless of the magnitude of load working on a sheave. SOLUTION: A sheave 40 and a rotating shaft 30 are secured to the outer peripheral surface of a sheave shaft 16 freely rotationally supported on bearings 12, 14, a rotor 32 is secured to the outer peripheral surface of the rotating shaft 30, and a stator 20 is connected to the outer peripheral surface of the rotating shaft 30 via bearings 26, 28 and flanges 22, 24. When the sheave shaft 16 is deflected by the application of load to the sheave 40 via a rope 44, the position of the rotor 32 is varied according to the deflection of the sheave shaft 16, and the position of the stator 20 is also varied to hold constant the gap G between the rotor 32 and the stator 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hoist, and more particularly to a hoist suitable for driving an elevator up and down.

[0002]

2. Description of the Related Art An elevator hoist that drives an elevator up and down is known as a hoist. Conventionally, this type of elevator hoist has been disclosed in, for example, Japanese Patent Application Laid-Open No. 57-9848.
As described in Japanese Patent Publication No. 4 (1993), both ends of a rotating shaft are rotatably fixed to a pair of bearings fixed to a base, and a brake disk, a sheave, and a rotor of an electric motor are fixed to the rotating shaft, respectively. The elevator basket (elevator) is connected to the sheave via a rope, the stator arranged with a gap between the rotor and the rotor is fixed to the base, and the sheave is rotated by the rotation drive of the electric motor. Is driven up and down according to the rotation of the sheave.

Further, as an elevator hoisting machine having a cantilever support structure, a rotating shaft is rotatably fixed to a pair of bearings fixed to a base, and a rotating shaft disposed between the bearings among the rotating shafts. The brake disk and the sheave are fixed, and the rotor of the electric motor is fixed to the rotating shaft that extends from one of the bearings in the direction away from the sheave, and is arranged with a gap between the rotor and the sheave. In addition, a known stator is fixed to a mounting plate, and the mounting plate is fixed to a support fixed to a base. In this structure, the motor is placed separately from the sheave with bearings in between,
The length of the rotating shaft can be shortened.

[0004]

In the prior art, the rotor of the motor is directly fixed to the rotating shaft to which the sheave is fixed. Therefore, when the motor is mounted on the rotating shaft, the rotor and the stator are not fixed. Must be separated and the rotor must be fixed to the rotating shaft, and then the stator must be fixed while maintaining a certain gap between the rotor and the rotor. Have to be adjusted. Furthermore, while the rotor is directly fixed to the rotating shaft to which the sheave is fixed,
Since the stator is fixed to the base directly or via the support base, when the basket is connected to the sheave via a rope, the suspended load of the cage acts on the sheave via the rope and the rotating shaft is rotated. When it bends, the gap between the stator and the rotor becomes narrower. For this reason,
When the electric motor is installed, the gap between the stator and the rotor is increased in advance in consideration of the bending of the rotating shaft. However, if the air gap between the rotor and the stator is larger than the set value, the power factor of the electric motor decreases. In addition, in order to reduce the change in the air gap between the stator and the rotor, it is possible to increase the diameter of the rotating shaft and reduce the deflection of the rotating shaft. The weight increases, and the bearings and the like must be increased in size.

An object of the present invention is to provide a hoist capable of suppressing a change in a gap between a rotor and a stator regardless of the magnitude of a load acting on a sheave.

[0006]

To achieve the above object, the present invention provides a sheave shaft rotatably fixed to a plurality of bearings, a sheave fixed to the outer periphery of the sheave shaft, An electric motor connected to a shaft for rotationally driving the sheave shaft, wherein the electric motor is connected to the sheave shaft and rotates with the sheave shaft; and a rotor fixed to the outer periphery of the rotator. And a stator fixed to the outer periphery of the rotating body via a bearing and arranged with a gap between the rotating body and the rotor.

When the hoist is constructed, a rotating body of the electric motor is constituted by an annular rotating shaft, and a sheave is arranged between a plurality of bearings as a cantilever support structure, and one of the bearings is interposed. Alternatively, a structure in which the electric motor is arranged at a position adjacent to the sheave or a structure in which the sheave and the electric motor are arranged between a plurality of bearings as a double-sided support structure can be adopted.

[0008] Further, in configuring each of the hoisting machines,
The following elements can be added:

(1) The stator is connected to and held by a support member that supports the stator while allowing the stator to move in a direction in which a load acts.

(2) The stator is connected to a support member that supports the stator in a state where the stator is restricted from moving in the rotational direction of the rotor and is allowed to move in other directions. Be done.

According to the above-described means, the rotor is fixed to the rotating body or the annular rotating shaft, and the stator is fixed to the rotating body or the annular rotating shaft via the bearing. After adjusting the gap between the motor and the rotating shaft, the electric motor can be fixed to the sheave shaft by fixing the rotating body or the annular rotating shaft to the sheave shaft. Furthermore, even if a load is applied to the sheave and the sheave shaft bends, the position of the rotor changes in accordance with the deflection of the sheave shaft, and the stator of the stator supported via a bearing on the rotating body or the annular rotating shaft. Since the position changes, it is possible to suppress a change in the gap between the rotor and the stator. Therefore, it is not necessary to increase the gap between the stator and the rotor in advance, and it is possible to prevent the power factor of the electric motor from being reduced. In addition, since the stator is supported by the support member in a state in which the stator is allowed to move in the direction in which the load acts, no centering work is required when the electric motor is mounted.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional front view of an essential part of an elevator hoist having a cantilever support structure. In FIG. 1, the elevator hoist includes a flat base 10 on which a pair of bearings 12 and 14 are fixed at a constant interval. A sheave shaft (rotary shaft) 16 is rotatably fixed to each of the bearings 12 and 14. The sheave shaft 16 is a shaft having a cantilevered support structure,
4, and the electric motor 18 is fixed to the extended portion. The motor 18 is the stator 2
0, flanges 22, 2 connected to both sides of the stator 20
4. Bearing 2 arranged on the tip side of flanges 22 and 24
6, 28, a cylindrical rotating shaft (rotating body) 30 fitted and fixed to the outer peripheral surface of the sheave shaft 16, and a rotor 32 fixed to the outer peripheral surface of the rotating shaft 30. Stator 20
A flat bracket 34 is connected to the bottom surface on the lower side of the. The bracket 34 has an oblong pin insertion hole larger than the diameter of the pin 36. The pin 36 is inserted into the pin insertion hole, and both ends of the pin 36 are supported by a pair of brackets 38. One end of each of the pair of brackets 38 is fixed to the base 10. That is, the bracket 34, the pin 36, and the bracket 38 serve as support members in a state in which the movement of the stator 20 along the rotation direction of the rotor 32 is restricted and the movement in the other direction is allowed, The stator 20 is allowed to move in the direction in which the load of 20 acts.
Has come to support. When electric power is supplied to the electric motor 18 and the rotor 32 is driven forward or backward, the rotor 32 rotates together with the rotating shaft 30 with the rotating driving of the electric motor 18, and the rotating force is transmitted to the sheave shaft 16.
It is transmitted to. At this time, the stator 20
Are a plurality of bearings 2 arranged on the outer peripheral surface of the rotating shaft 30.
6, 28, the flanges 22 and 24, and the bracket 38 via the bracket 34 and the pin 36.
, A certain gap is maintained with the rotor 32.

On the other hand, an annular sheave 40 and an annular brake disk 42 are fixed to the outer periphery of the sheave shaft 16 disposed between the bearings 12 and 14. A rope 44 is wound around the sheave 40, and an elevator cage (elevator) is connected to one end of the rope 44. A pair of pads 46 and 48 are arranged on the outer peripheral side of the brake disc 42 with the brake disc 42 interposed therebetween, and the pads 46 and 48 are connected to an electromagnetic brake device 50. When the ON signal is input from the electromagnetic brake device 50, the pads 46 and 48 separate from each other from the brake disc 42 against the spring force, and when the OFF signal is input from the electromagnetic brake device 50,
The brake disk 42 is closed by a spring force to apply a braking force to the brake disk 42.

In the above configuration, when installing the electric motor 18, the electric motor 18 can be fixed to the sheave shaft 16 by fitting and fixing the rotary shaft 30 to the outer peripheral surface of the sheave shaft 16. That is, the electric motor 18 includes the sheave shaft 16,
Since the rotor 32 is fixed to the outer peripheral surface of the rotating shaft 30 and is independent of the sheave 40, the gap G between the rotor 32 and the stator 20 is kept at a certain distance when the electric motor 18 is assembled. It is not necessary to adjust the gap G between the rotor 32 and the stator 20 when the electric motor 18 is mounted or replaced.

On the other hand, when the sheave shaft 16 rotates together with the rotation shaft 30 by the rotation drive of the electric motor 18, the sheave 4
The load of the basket connected to the rope 0
When the sheave shaft 16 bends, the position of the rotor 32 changes in accordance with the bend of the sheave shaft 16.
Are connected to the rotating shaft 30 via bearings 26 and 28, and the bottom side of the stator 20 is supported by the bracket 38 via the bracket 34 and the pin 36.
The position of the stator 20 changes in accordance with the change in the position, and the change in the gap between the rotor 32 and the stator 20 can be suppressed.

According to the present embodiment, the electric motor 28 is constructed independently of the sheave shaft 16 and the sheave 40, so that the electric motor 18 can be easily mounted and replaced.

Further, according to the present embodiment, the rotor 32 is fixed to the sheave shaft 16 via the rotating shaft 30 and the rotating shaft 3
0, the stator 20 is connected via the bearings 26 and 28 and the flanges 22 and 24, so that the gap G between the rotor 32 and the stator 20 is independent of the magnitude of the load acting on the sheave 40. Can be suppressed. Further, since the change in the gap G between the rotor 32 and the stator 20 can be suppressed, the power factor of the electric motor can be improved.

Further, according to the present embodiment, the motor 18
The bottom of the motor 1 is supported by the bracket 38 via the bracket 34 and the pin 36, and the stator 20 is allowed to move in the direction in which the load is applied.
The centering work at the time of mounting 8 becomes unnecessary.

Next, an embodiment of a double support structure will be described with reference to FIG.

In this embodiment, both ends of the sheave shaft 16 are rotatably supported by bearings 12 and 14, and
The sheave 40 and the brake disk 42 together with the electric motor 18 are provided on the outer peripheral surface of the sheave shaft 16 disposed between the bearings 12 and 14.
And fix the bracket 34 at the bottom of the stator 20 to the base 1
It is connected via a pin 36 to a bracket 38 fixed on the upper part 0, and the same or corresponding parts as those in the above-described embodiment are denoted by the same reference numerals and description thereof is omitted.

Also in this embodiment, since the electric motor 28 is configured independently of the sheave shaft 16 and the sheave 40,
The installation and replacement work of the electric motor 18 can be easily performed.

Further, according to the present embodiment, the rotor 32 is fixed to the sheave shaft 16 via the rotation shaft 30 and the rotation shaft 3
0, the stator 20 is connected via the bearings 26 and 28 and the flanges 22 and 24, so that the gap G between the rotor 32 and the stator 20 is independent of the magnitude of the load acting on the sheave 40. Can be suppressed. Further, since the change in the gap G between the rotor 32 and the stator 20 can be suppressed, the power factor of the electric motor can be improved.

Further, according to the present embodiment, the motor 18
The bottom of the motor 1 is supported by the bracket 38 via the bracket 34 and the pin 36, and the stator 20 is allowed to move in the direction in which the load is applied.
The centering work at the time of mounting 8 becomes unnecessary.

[0025]

As described above, according to the present invention,
Since the stator is fixed to the rotating body or the annular rotating shaft and the stator is fixed to the rotating body or the annular rotating shaft via bearings, the stator is not affected by the magnitude of the load acting on the sheave. Change of the gap between the stator and the rotor can be suppressed, the management of the gap between the stator and the rotor can be facilitated, and the power factor of the electric motor can be improved.

[Brief description of the drawings]

FIG. 1 is a sectional front view of an essential part showing one embodiment of the present invention.

FIG. 2 is a cross-sectional front view of a main part showing another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Base 12, 14 Bearing 16 Sheave shaft 18 Electric motor 20 Stator 26, 28 Bearing 30 Rotating shaft 32 Rotor 34 Bracket 36 Pin 38 Bracket 40 Sheave

Claims (5)

[Claims] 1. A sheave shaft rotatably fixed to a plurality of bearings, a sheave fixed to the outer periphery of the sheave shaft, and an electric motor connected to the sheave shaft to rotate the sheave shaft. The electric motor is connected to the sheave shaft and rotates with the sheave shaft, a rotor fixed to the outer periphery of the rotor, and a rotor fixed to the outer periphery of the rotor via a bearing, A hoist comprising: a stator disposed with an air gap between the rotor and the rotor. 2. A sheave shaft rotatably fixed to a plurality of bearings, a sheave shaft disposed between the plurality of bearings and fixed to an outer periphery of the sheave shaft, and the one bearing interposed therebetween. An electric motor arranged at a position adjacent to the sheave and fixed to the outer periphery of the sheave shaft to rotationally drive the sheave shaft; the electric motor includes an annular rotating shaft fixed to the outer periphery of the sheave shaft. A rotor fixed to the outer periphery of the annular rotating shaft, and a stator fixed to the outer periphery of the annular rotating shaft via a bearing and arranged with an air gap between the rotor and the rotor. Hoisting machine. 3. A sheave shaft rotatably fixed to a plurality of bearings, a sheave disposed between the plurality of bearings and fixed to an outer periphery of the sheave shaft, and a sheave shaft between the plurality of bearings. An electric motor arranged with the sheave and fixed to the outer periphery of the sheave shaft to rotationally drive the sheave shaft, the electric motor comprising: an annular rotating shaft fixed to the outer periphery of the sheave shaft; A hoisting machine comprising: a rotor fixed to the outer periphery of a shaft; and a stator fixed to the outer periphery of the annular rotating shaft via a bearing and arranged so as to maintain a gap between the rotor and the rotor. . 4. The stator according to claim 1, wherein the stator is connected to and supported by a support member that supports the stator while allowing the stator to move in a direction in which a load acts. Hoist. 5. The stator is connected to a support member that supports the stator in a state where the stator is restricted from moving in the rotation direction of the rotor and is allowed to move in other directions. A hoist according to claim 1, 2 or 3.