JPS6155080A - Winding machine for elevator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an elevator hoist that is installed above the hoisting path of an elevator and drives the elevator up and down, and in particular, relates to The present invention relates to an elevator hoisting machine which is a direct-coupling type in which a sheave is directly attached without using a gear mechanism, and which requires cooling.

[Technical background of the invention and its problems]

Conventionally, this type of elevator hoisting machine has been constructed using a DC electric drive. In other words, as shown in FIG. 5, a DC motor 2 is provided on the machine bed 1, and the DC motor 2 has an electric armature 4 and a commutator 5 attached to the rotor shaft 3 at approximately the middle portion thereof, and the electric armature 4 and the commutator 5 are mounted on the rotor shaft 3. It is constructed by providing a frame 7 with a field 6 attached to the outer periphery 7, and the frame 7 is connected to the machine bed 1.
A bearing stand 9° with a quintuplet retainer 8 attached to the commutator 5 side of the DC motor 2 is erected on the machine bed 1 to support one end of the rotor fill 3, and On the side opposite to the commutator, there is a brake drum 11A of the brake device 10 and a sheave 1 of the elevator hoisting lobe 12.
1B is integrated with the rotor shaft 3.
The bearing stand 13 is attached to the outer side of the bearing stand 13.
stands upright from the machine bed 1 and supports the other end of the rotor shaft 3 to form the whole structure.

Here, the operation of hoisting is carried out by rotating the DC motor 2 by energizing the electric iron 4 and the magnetic field 6, but even when the operation is stopped, the field 6 is supplied with the electric power when the elevator is called. It is often kept energized at all times to improve response. In such an elevator hoisting machine, the field 1if16 of the DC machine vJ machine 2 generates heat when it is constantly energized, so it is necessary to cool it, and this is generally done by natural cooling. In order to make the natural cooling effective, it is necessary to make the electric motor 112 large, and as a result, there is a problem that the entire hoisting unit becomes large and large in size.

In addition, on the other hand, as shown in FIG. 6, a blower] 4 is provided,
There is a forced draft cooling type that cools the electric leprosy 2 by the air blowing action of the blower 14, but even with this, the external dimensions are large due to the installation of the blower 14, and moreover, it is necessary to cool the field 6 which is constantly energized. The blower 14 must also be kept in operation at all times, which is uneconomical since the electricity bill for the blower 14 increases, and a protection device is also required in the event of a failure of the blower 14, resulting in an expensive problem. there were.

In addition, in both the natural cooling type shown in FIG. 5 and the forced draft cooling type shown in FIG. Therefore, the brake drum 11A and sheave 11B are not provided on the side opposite to the commutator, and therefore the brake drum 11A and sheave 11B are
Since the sheave 11B and the hoisting lobe 12 are installed in close proximity to each other or in an integrated state such as the upper J-bo, the oil from the sheave 11B and the hoisting lobe 12 that wraps around it will be scattered onto the adjacent brake drum 11A, resulting in a decrease in braking performance. Due to the problems caused, it was necessary to perform regular Qing (11) frequently.

On the other hand, due to advances in electronics, AC cylinder vJ
The development of a hoist using OII has been progressing, and unlike conventional DC motors, the AC cylinder 1JIX1 does not require the commutator 5 or brush holder 8, so the It has become smaller and lighter, and since it only needs to be energized during operation, there is no need to constantly send cooling air, so even if a blower is used, it is possible to reduce the electricity bill by V. Simply replacing a DC motor with an AC motor does not change the need for cooling during operation, so it is necessary to make the motor larger and provide natural cooling or a blower for forced draft cooling. However, there were circumstances in which it was not possible to achieve a significant reduction in size and weight as expected, and it also did not lead to improved maintainability of the brake drum.

[Purpose of the invention]

This invention was made in consideration of the above circumstances, and it is possible to significantly reduce the size and weight of the elevator, as well as provide effective cooling, easy maintenance, and a highly reliable elevator hoist despite its small size. Aims to serve the country.

[Summary of the invention]

In order to achieve the above object, the elevator hoist of the present invention uses DC electric compensation instead of the conventional DC motor, and thereby eliminates the need for a brush holder etc., thereby reducing the rotor of the AC motor. A brake drum is provided on one of the outer sides of the brake drum, and a sheave is fitted onto the rotor shaft on the other side to completely eliminate the scattering of oil from lobes and the like against the brake drum. The drum and sheave are configured like a fan that blows air to the electric motor by rotating, and the electric motor is effectively cooled from both sides. This eliminates the need to do so.

(Embodiment of the Invention) An embodiment of the invention will be described below with reference to FIGS. 1 to 3. Note that the figure is the same as that in Figures 5 and 6 above (3
Components will be given the same reference numerals to simplify the explanation. Here, an AC motor 20 is provided on the machine blades 1 to 1.

The rotor 22 is attached to the approximate middle part of this AC electric motor (il 20 is the rotor shaft 2), and a frame 24 with a stator 23 attached to the outer periphery is provided. The frame 24 of the AC electric motor 20 is arranged in a frame shape only on both sides of the outer periphery of the stator 23, and both ends are left wide open. Furthermore, a cover 25 is provided on the outside of the frame 24 to protect the coil 23a of the stator 23.Also, both ends of the rotor shaft 2) are placed upright on the machine bed 1, and both ends of the rotor shaft 2) are covered with brushes as in the past. It is supported by a bearing stand 9.13 without a cage or the like.

By adopting such an AC motor 20, the conventional beating brush holder becomes unnecessary, so the rotor 2 of the AC motor 20
The brake drum 26 can be mounted on one side of the outer circumferential position sandwiching the rotor 22, and the sheave 27 can be mounted on the other side of the rotor 22.
are fitted onto the rotor shaft 2). Moreover, the brake drum 26 and the sheave 27 each have an opening of a fan that blows air to the electric motor 1!120 as they rotate.In other words, the brake drum 26 and the sheave 27 Boss parts 26a, 27a that fit onto the rotor shaft 2), and a plurality of arms 26 projecting radially from the outer periphery at equal intervals from the boss parts 25a, 27a.
b, 27b, and cylindrical rims 26c, 27c supported on the outer ends of the arms 26a, 27a,
Each of the radially arranged arms 26b, 27b is in the shape of a blade that is equally inclined in the same direction with respect to the axis of rotation.

Therefore, in the elevator hoisting machine with the above configuration, the AC type D
A car (not shown) of the elevator is driven up and down by forward and reverse rotation by energization of Ii20.

During such operation, the brake drum 26 and sheave 27 rotate together with the rotor shaft 2) in the same direction.

As a result of this rotation, each of the blade-shaped arms 26b,
27b acts as an axial fan and exerts a blowing action, generating a flow of air (wind) as shown by the arrow in the figure. That is, during forward rotation, cooling air is taken in from the outside of the sheave 27 and sent into the electric motor 1 20, where the electric motor! 11 The warm air that has removed the heat inside the lXl is transferred to the brake drum 26 on the opposite side.
ff! It is sucked out by the l and released to the outside. Furthermore, when the rotation is reversed, the air blowing action is performed in the completely opposite flow to that described above. With this, the inside of the electric fIJII 20 can be effectively cooled in both forward and reverse rotations.

The elevator operates in forward and reverse directions (up and down).
are carried out almost alternately, so that the air cooling effect due to the axial fan effect of the brake drum 26 and sheave 27 acts equally on both sides of the motor 20, and the temperature on both sides can always be lowered approximately equally. . Further, when the operation is stopped, in the case of the AC electric motor 120, the stator 23 does not need to be energized, so cooling during the stop is unnecessary and does not need to be considered.

Next, another embodiment of the present invention will be described with reference to FIG.

Here, the brake drum 36 provided on one side of the AC motor 20 with the rotor 22 sandwiched therebetween, and the m-wheel 37 provided on the other side, protrude from the boss portions 36a and 37a and the outer periphery of the boss portion, respectively. The structure consists of disks 36b, 37b and cylindrical rims 36c, 37c supported on the outer periphery of the disks, and the disks 36b, 37b have a plurality of ventilation holes spaced apart in the circumferential direction. 36d and 37d are formed, and a plurality of blade-shaped ribs 36e and 37e are formed at equal intervals in the circumferential direction on the inner surface of each of the disks 36b and 37b, that is, on the rotor 22) 11!1 surface. It is provided with a protruding structure, and when it rotates, it has a function of blowing air like a radial fan. Even in this case, cooling air can be blown inside the electric motor 112.0 as shown by the arrow during rotation, and the same cooling effect as in the above embodiment can be achieved by 1U.

〔Effect of the invention〕

As mentioned above, this invention is applicable to conventional DC ffi fJJ
In addition to using a DC motor instead of Iff, and thereby eliminating the need for a brush holder, etc., it is possible to install a brake drum on one side of the rotor and a sheave on the other side of the AC motor. It is fitted onto the rotor shaft, and the brake drum and sheave are configured like a fan that blows air to the electric shaft by rotating it. There is no need to make the electric bowl large or install a blower like in the past.
In addition to being significantly smaller and lighter, there is no oil splashing from the hoisting lobes on the brake drum, and there is no need to clean the drum, making maintenance extremely simple. A highly reliable elevator hoist.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional front view showing an embodiment of the present invention, FIG. 2 is an end view of FIG. 1, FIG. 3 is a partially enlarged plan view of FIG. FIGS. 5 and 6 are partially sectional front views showing conventional examples, respectively. 1...Machine bet, 2...AC electric wire, 3,2)
... Rotor shaft, 4... Type identifier, 5... Commutator, 6
...Field, 7.24...Frame, 8...Brush holder, 9.13...Bearing stand, 10...
Brake device, 11... Rotating drum, 11A, 26.
36... Brake drum, 11B, 27.37...
Sheave, 14 blower, 26a-, 27a36a, 37a-
...Boss part, 26b. 27 b--arm, 26c, 27c, 36c, 37
C...Rim, 36b, 37b...Disc, 36d, 3
7d... Ventilation hole, 36e, 37e... Rib. Applicant's agent Patent attorney Takehiko Suzue Figure 1 Figure 2 Figure 3

Claims (3)

[Claims] (1) An AC motor is provided with both ends of the fixed side frame open, and a brake drum is placed on one side of the rotor of the AC motor, and a sheave for the elevator hoisting rope is placed on the other side. 1. A hoisting machine for an elevator, characterized in that the hoisting machine is fitted onto a rotor shaft, and the brake drum and sheave thereof are structured to blow air to the electric motor as the motor rotates. (2) A patent claim characterized in that the brake drum and sheave are configured such that each arm extending radially from the respective boss portion to the rim is in the shape of a plate blade inclined with respect to the axis of rotation to perform a blowing action. The elevator hoisting machine according to item 1. (3) The brake drum and the sheave have a configuration in which a disc with ventilation holes between the respective bosses and the rim has ribs on the side surface of the rotor for blowing air. The elevator hoisting machine according to item 1.