JPS6317754B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an elevator hoisting machine in which a sheave is directly fitted onto a shaft rotated by an AC motor.

[Background technology of the invention and its problems]

Conventionally, a DC motor system shown in FIG. 1 has been used as a gearless elevator hoist. That is, in the hoisting machine, a frame 3, which constitutes a part of the magnetic circuit of the field, is fixed on a machine base 1 via mounting legs 2.
A shaft 6 is rotatably supported by bearings provided on mirror covers 4 and 5 that close both ends of this frame 3.
At the same time, a steel wheel 7 is fitted to a shaft 6 protruding outward from one mirror cover 5,
A wire rope 9 suspending the elevating body 8 is hung on the steel car 7, and the rotation of the electric motor is directly transmitted to the steel car 7 via the shaft 6 to move the elevating body 8 up and down. The rotation of the car 7 is stopped.

Here, the frame 3 must be thickened to some extent due to magnetic properties and the need to increase rigidity, and the weight of the elevating body 8 must ultimately be borne by the frame 3 and the mounting legs 2. For this reason, the mounting legs 2, the frame 3, etc. have thick walls, and as a result, the weight of the hoist as a whole increases, making it difficult to carry it into a building and install it.

On the other hand, recently, studies have been made on hoisting machines using AC motors. Compared to a DC motor, such an AC motor does not require a commutator brush holder, so the hoist can be made smaller and lighter, and there is no need to replace brushes or maintain the commutator. However, simply using an AC motor in place of the conventional DC motor does not lead to a significant reduction in weight or improvement in ease of assembly.

[Purpose of the invention]

The present invention was made in view of the above-mentioned conventional problems, and its purpose is to maximize the advantages of using an AC motor by eliminating the frame, which can be said to be the heaviest in conventional hoisting machines. The object of the present invention is to provide a hoisting machine for an elevator, which makes use of its limitations to significantly reduce weight and improve ease of assembly.

[Summary of the invention]

The elevator hoisting machine according to the present invention has both a rotor and a sheave of an AC motor fitted to a shaft supported by a pair of bearing stands, and a laminated iron core disposed around the rotor. Support both ends with a pair of holding plates,
The outline is that the lower end of this presser plate is fixed to the machine base.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to FIGS. 2 to 8.

FIG. 2 is a front view of the hoisting machine according to the present invention, and FIG.
The figure is a side view of the hoisting machine, and the hoisting machine is machine stand 11.
Rail-shaped blocks 11a, 11a spaced back and forth
A pair of bearing stands 12 and 13 are installed spaced apart from each other on the left and right so as to straddle these blocks 11a and 11a.
A shaft 16 is rotatably held by these bearings 14 and 15. Moreover, the bearing 14,
15 is the bearing stand 12, 13 by the end cover 17, 18
Fixed.

Further, a sheave 20 having a wire rope 19 wound thereon is fitted to the shaft 16 between the bearing stands 12 and 13 so as to rotate integrally with the shaft 16, and a brake drum 21 is fitted to the sheave 20. It is integrated.

An AC motor 22 is disposed on the side of one bearing stand 12 . The rotor 23 of the AC motor 22 is press-fitted or key-fitted onto the shaft 16 that protrudes laterally from the bearing stand 12, and the laminated core 24 on the stator side provided around the rotor 23 is laminated to a predetermined size. After that, it is pressurized and held on both sides by core holders 25, 25. That is, as shown in FIG. 3, the core retainer 25 is composed of an annular portion 25a and legs 25b extending downward from both sides of the annular portion 25a, and the legs 25b are bent outward in an angular shape. The bent portion 25c is fixed to the machine base 11 with bolts or the like. The inner diameter of the annular portion 25a is set to such an extent that it does not interfere with the coil 26, and the outer diameter is set to an extent that does not interfere with the coil 26.
A ring-shaped recess 25d is formed inside the inner diameter portion of the annular portion 25a, and the outer peripheral portion of the laminated core 24 fits into this recess 25d.
Then, a stud bolt 2 is inserted between the core holders 25 and 25 to clamp the laminated core 24 fitted in the recess 25d.
7 and tighten nuts 28, 28.

In addition, in FIGS. 2 and 3, the stud bolt 27 is passed through the outside of the laminated core 24 to connect the core holders 25, 25, but the sectional view taken along the line A-A in FIGS. As shown in FIG. 5, a through hole 29 is bored in the laminated core 24, a rivet 30 is inserted into the through hole 29, and the core retainer 25,
25 may be combined. In addition, as shown in FIGS. 6 and 7, a fixing plate 3 is attached to the outer periphery of the laminated core 24.
1, and hold both ends of this fixing plate 31 with iron core holder 2.
The laminated core 24 may be held by welding to the inner surfaces of the cores 5 and 25. By doing so, the aforementioned stud bolt can be omitted.

FIG. 8 is a front view of another embodiment, and in the embodiment described above, an AC motor 22 is attached to one end of the shaft 16.
In this embodiment, the AC motor 22 is installed between the spans of the bearing stands 12 and 13. That is, the shaft 16 is rotatably supported by the bearings 14 and 15 of the bearing stands 12 and 13 erected on the machine stand 11, and the bearing stands 12 and 1 of the shaft 16 are rotatably supported.
The rotor 23 of the AC motor 22 and the sheave 20 are connected between 3 and 3.
A laminated core 24 disposed around the rotor 23 is further held between core holders 25, 25, and the frame is omitted even in this embodiment.

〔Effect of the invention〕

As explained above, according to the present invention, all the weight of the elevating body is borne by the bearing stand and the machine base, and is not applied to the AC motor.In addition, the laminated iron core is held between the core holders, and the weight of the elevating body is borne by the machine base. Since it is fixed to the stand, only its own weight and rotational reaction force act on the core holder, and the conventional frame can be omitted. Therefore, it is possible to achieve a large reduction in weight, the work of installing the hoisting machine becomes extremely easy, and since the frame is omitted, the cooling effect can be expected to be improved, and many other effects are exhibited.

[Brief explanation of the drawing]

Fig. 1 is a front view of a conventional hoisting machine, Fig. 2 is a front view of a hoisting machine according to the present invention, Fig. 3 is a side view of the hoisting machine shown in Fig. 2, and Fig. 4 is an iron core. FIG. 5 is a sectional view taken along the line A-A in FIG. 4, and FIG. 6 is a side view similar to FIG. Side view similar to figure,
7 is a view taken in the direction of arrow B in FIG. 6, and FIG. 8 is a front view showing another embodiment of the hoist. 11... Machine base, 12, 13... Bearing stand, 14,
15...Bearing, 16...Shaft, 20...Sheave, 22
... AC motor, 23 ... rotor, 24 ... laminated core, 25 ... core holder, 27 ... stud bolt, 30 ... rivet, 31 ... fixing plate.

Claims (1)

[Claims] 1. A shaft is rotatably supported by a pair of bearing stands set up on the machine base, the rotor and sheave of an AC motor are fitted to this shaft, and the laminated shaft is arranged around the rotor. A hoisting machine for an elevator, characterized in that both ends of the iron core are held between a pair of holding plates whose lower ends are fixed to the machine base, and the laminated iron core is supported on the machine base side.