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Electromagnetic braking device for elevator

An electromagnetic braking and elevator technology, which is applied in transportation, packaging, elevators, etc., can solve problems such as the decrease of electromagnetic attraction force, the inability to obtain braking force, and the increase in the width of the hoist 3

Active Publication Date: 2016-06-08
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] On the other hand, when the electromagnetic brake devices 4 are arranged at positions facing each other along the horizontal direction of the brake drum 7, the width dimension of the hoist 3 will increase.
If the electromagnetic brake device 4 is thinned in order to reduce the width, the electromagnetic attractive force will decrease due to the increase in reluctance as the electromagnetic winding is reduced in size, and there is a problem that a predetermined braking force cannot be obtained.

Method used

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  • Electromagnetic braking device for elevator
  • Electromagnetic braking device for elevator
  • Electromagnetic braking device for elevator

Examples

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Effect test

no. 1 example

[0068] Figure 6 It is a sectional view showing the electromagnetic brake device according to the first embodiment of the present invention. Below, refer to Figure 6 A first embodiment of the present invention will be described. The basic structure of the first embodiment is the same as the existing electromagnetic braking device, but as Figure 6 As shown, each of the fixed iron core 8 and the movable iron core 9 is formed in a U-shape having an opening, and the fixed iron core 8 and the movable iron core 9 are arranged so that the openings face each other. In addition, the electromagnetic winding 10 is provided in the opening portion. Thereby, compared with the conventional structure, the magnetic flux which leaks into space from the opposing part of the fixed iron core 8 and the movable iron core 9 can be reduced significantly.

[0069] Figure 7A is a magnetic flux density vector diagram showing the magnetic field analysis results of a conventional electromagnetic br...

no. 2 example

[0081] exist Figure 10 In the structure of the first embodiment shown, since the electromagnetic winding 10 is inserted into the winding insertion portion, it is necessary to provide a gap between the inner diameter of the electromagnetic winding 10 and the outer shape of the inner magnetic pole portion of the fixed core 8 in consideration of processing accuracy. As a result, the area of ​​the inner magnetic pole becomes smaller.

[0082] Since the electromagnetic attractive force is represented by the following formula, in order to increase the attractive force, the magnetic pole area must be increased.

[0083] F = B 2 μ 0 A · · · · · · ( 1 )

[0084] F: Attractive force [N], B: Magnetic flux density of the gap [T], μ 0 : Magnetic perm...

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Abstract

The invention provides an electromagnetic brake structure which is used for an electromagnetic brake device that brakes a hoister by pressing the periphery of a brake drum. Therefore, the electromagnetic brake device can be thin, is improved in attraction and is excellent in maintainability. The electromagnetic brake device includes a fixed iron core; an electromagnetic winding arranged on the fixed iron core and forms magnetic flux when being powered on; a movable iron core which is attracted toward the fixed iron core under the effect of the magnetic flux; and a brake liner disposed on the movable iron core which is separated from the brake drum when the movable iron core is attracted to make the electromagnetic brake device stay in a separated state. The electromagnetic brake device is characterized in that each of the fixed iron core and the movable iron core, having an opening, is formed to be shaped like a 90-degree rightward rotated U, and the electromagnetic winding is disposed in the two openings of the fixed iron core and the movable iron core.

Description

technical field [0001] The invention relates to an electromagnetic braking device for braking an elevator car, in particular to a thin electromagnetic braking device suitable for use in elevators without a machine room. Background technique [0002] Generally speaking, a machine room is provided on the upper part of the building, and the winch and control device for raising and lowering the elevator car and the governor for detecting the overspeed of the elevator car are arranged in the machine room. However, among elevators whose ascending and descending strokes are short and whose elevator car ascends and descends at a slow speed, elevators without a machine room that do not have an independent machine room have been popularized. [0003] In the elevator without a mechanical room, the hoist, control device, governor and other equipment that should have been installed in the mechanical room are all installed in the hoistway. In addition, due to the limited space in hoistwa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B66B5/02B66B5/24
Inventor 早川智久野口直昭五十岚章智小野哲志
Owner HITACHI LTD