JPH0417868B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an elevator hoist, and more particularly to an elevator hoist using an AC motor.

[Technical background of the invention and its problems] In recent years, an AC motor has been proposed for a gearless elevator hoisting machine in place of the conventionally used DC motor.

An elevator hoist using such an AC motor will be explained with reference to FIG. That is, as shown in the figure, bearing stands 2 and 3 are arranged at both ends of the machine stand 1, and between the bearing stands 2 and 3,
An AC motor 4 is installed. A sheave 6 is inserted and attached to the rotating shaft 5 of the AC motor 4, and both ends of the sheave 6 are rotatably supported by bearing stands 2 and 3. A stator 8 made of a laminated iron core is concentrically arranged around the rotor 7 of the rotating shaft 5.

The stator 8 is sandwiched between core holders 9 and 10 from both sides, and is fixed by tightening the core holders 9 and 10 with bolts and nuts 11. The lower portions of the core holders 9, 10 are bent outward in an angular shape, and the bent portions 9a, 10a are fixed to the machine base 1 with bolts or the like.

In the elevator hoisting machine configured in this way, the stator 8 is held between the core holders 9 and 10, and the core holders 9 and 10 are fixed to the machine base 1. , only its own weight and rotational reaction force act, and the frame used in DC motors can be omitted. Therefore, it is possible to significantly reduce the weight, making the installation work of the hoist extremely easy, and since the frame is omitted, the cooling effect can be expected to be improved, among other effects.

By the way, in the elevator hoisting machine configured in this way, since the bearing stands 2 and 3 are arranged on both sides of the AC motor 4 on the machine stand 1,
The total length includes the bearing stands 2 and 3 on both sides. Therefore, there was a problem in that it was difficult to align the centers of the bearing stands 2 and 3 on both sides with the stator 8.

Further, as shown in FIGS. 5 and 6, the elevator roping is fixed at both ends of the rope 12 by rope hits 14 installed on the floor 13 of the machine room. The installation position of the rope hitch 14 is determined based on the size of the car 15 and counterweight 16 based on the position of the sheave 6, so the position of the rope hitch 14 may be below the machine base 1. .

In such a case, as shown in Fig. 4, a beam 17 is inserted between the machine base 1 and the machine room floor 13 to lift the machine base 1, thereby securing space for the rope hitch 14. .

However, this method has the disadvantage that if the height from the floor to the ceiling of the machine room is low, the elevator hoist cannot be installed.

[Object of the Invention] The present invention has been made to solve these conventional difficulties, and it is possible to easily align the centers of the bearing and the stator, and also to save space for the rope hitch without lifting the machine base. The purpose of the present invention is to provide an elevator hoisting machine that can ensure the following.

[Summary of the Invention] That is, the elevator hoisting machine of the present invention has a rotor fixed to the outer periphery of a rotating shaft, a stator arranged concentrically around the outer periphery of the rotor, and a pair of iron cores holding the stator. In a frameless type elevator hoisting machine, the hoisting machine is fixed to the machine base with is attached to a bearing bracket provided on the core holder on the opposite side of the sheave, and the other of the bearings is attached to a bearing stand fixed to the machine base, thereby aligning the centers of the bearing and the stator. This makes it possible to easily do this and to secure space for the rope hitch.

[Embodiments of the Invention] Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIG. 1 and FIG. 2 show an elevator hoisting machine according to an embodiment of the present invention.
A rotating shaft 23 around which a rotor 22 is fixed is arranged, and a sheave 24 is inserted and attached to this rotating shaft 23. A stator 25 is arranged concentrically around the outer periphery of the rotor 22. On both sides of these stators 25, core holders 26, 2
A plurality of ribs 28 are arranged on the outer periphery of the stator 25, and these ribs 28 and core holders 26, 27 on both sides are fixed by welding or the like and are integrated. The lower portions of the core holders 26 and 27 are bent outward in an angular shape, and the bent portions 26a and 27a are attached to the machine base 21 with bolts 29.
An AC motor 30 is configured by being fixed to the AC motor 30.

The core holder 26 has a screw hole (not shown) at the tip.
A cylindrical portion 26b is formed, and a bearing bracket 32 to which a bearing 31 is attached is fixed by a bolt 33 to the tip of this cylindrical portion 26b.

Further, on the machine base 21 on the sheave 24 side, a bearing stand 35 to which a bearing 34 is attached is fixed to the machine base 21 with bolts. Both ends of the rotating shaft 23 of the AC motor 30 are rotatably supported by a bearing 31 of a bearing bracket 32 and a bearing 34 of a bearing stand 35.

In the elevator hoisting machine of the present invention configured as described above, the cylindrical portion 26b is formed in the core presser 26, and the bearing bracket 3 is attached to the cylindrical portion 26b.
2 is fixed and the bearing 31 is attached to this bearing bracket 32, so the bearing 34 of the bearing stand 35 is fixed.
The centers of the bearing 31, the stator 25, and the bearing 34 can be easily aligned by simply aligning the center of the stator 25 with the center of the stator 25. In addition, since the length of the machine stand 21 is shortened by one bearing stand, the rope hitch 37 is placed on the machine room floor 36 in this empty space.
It becomes possible to provide Therefore, machine 21
There is no need to lift the elevator using a beam or the like, and the elevator hoist can be installed even in places where the height of the machine room is low.

FIG. 3 shows an elevator hoisting machine according to another embodiment of the present invention, in which the stator 25
Core holders 38 and 39 are arranged on both sides of the core holder 38, and the core holder 38 has a recessed stepped portion 38a.
This recessed step portion 38a has a flange portion 40a at its tip.
A bearing bracket 40 having a cylindrical portion 40b and having a bearing 31 attached thereto is attached to the bolt 4.
It is fixed by 1.

In the elevator hoisting machine of this embodiment, the cylindrical portion 40b is formed in the bearing bracket 40 and is fixed to the core holder 38 by bolts, so that the core holders 38, 39 and the bearing bracket 40 are fixed.
In addition, as in the embodiment shown in FIG. 1, the centers of the bearing 31, the stator 25, and the bearing stand (not shown) can be easily aligned. Furthermore, since the length of the machine stand 21 can be shortened by one bearing stand, the rope hitch 37 can be provided on the machine room floor 36 in this empty space.

In addition, in each of the embodiments described above, the strength of the core holder is made greater than that of the conventional one, so the weight increases, but one bearing stand is omitted and the machine stand is further made smaller, so the overall weight is the same as that of the conventional one. It can be made similar to or less than.

[Effects of the Invention] As described above, according to the elevator hoisting machine of the present invention, one side of the bearing mechanism is connected to the machine base via the bearing bracket provided on the core holder on the opposite side of the sheave and the core holder. Since they are fixed, it is easy to align the centers of the bearing and the stator, and space for the rope hitch can be secured without lifting the machine base.

[Brief explanation of drawings]

Fig. 1 is a partially sectional side view showing an elevator hoisting machine according to an embodiment of the present invention, and Fig. 2 is a -
FIG. 3 is a partially sectional side view showing an elevator hoisting machine according to another embodiment of the present invention, and FIG. 4 is a view showing a conventional elevator hoisting machine. A partially sectional side view, FIG. 5 is an explanatory view showing the roping of the elevator of FIG. 4, and FIG. 6 is a view taken along the - line in FIG. 5. 21... Machine base, 22... Rotor, 23... Rotating shaft, 24... Sheave, 25... Stator, 26,2
7, 38, 39... Core holder, 31, 34... Bearing, 32, 40... Bearing bracket, 35
...Bearing stand.

Claims (1)

[Claims] 1. A rotor is fixed to the outer periphery of the rotating shaft, a stator is arranged concentrically around the outer periphery of the rotor, this stator is fixed to the machine base with a pair of iron core holders, and a sheave is further attached to the rotating shaft. A frameless type elevator hoisting machine which is fitted and whose both ends are respectively supported on the machine base via bearings, wherein one of the bearings is provided on the core holder on the opposite side from the sheave. A hoisting machine for an elevator, characterized in that the hoisting machine is attached to a bracket, and the other of the bearings is attached to a bearing stand fixed to the machine stand.