JPS63111326A - Magnetic powder type electromagnetic braking device - Google Patents

Abstract

PURPOSE:To effectively cool the whole braking device, by providing heat pipes with fins near an operating portion of a rotor, near an exciting coil and in a stator, and thereby radiating heat generated to the outside. CONSTITUTION:A heat pipe 13 includes a sealed pipe 14 mounted at its inner end portion into a central portion of a stator 11 and provided at the outer end portion with a cooling fin 17. A blower 23 is located on the outer side of the cooling fin 17. A plurality of heat pipes 20 are provided near an operating portion of a rotor 6, and a plurality of heat pipes 24 are provided at an outer periphery of an exciting coil 2. Frictional heat to be generated upon braking is radiated by the heat pipes 20 in the rotor 6, the heat pipe 13 in the stator 11, the heat pipes 24 at the exciting coil 2 and the blower 23 through the cooling fins 22, 17 and 26 to the outside. Accordingly, the braking device may be efficiently cooled by the three kinds of heat pies 13, 20 and 24.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cooling structure for an electromagnetic brake device that performs braking via magnetic particles.

[Conventional technology]

FIG. 2 is a sectional view showing a conventional magnetic particle type electromagnetic braking device disclosed in, for example, Japanese Utility Model Publication No. 60-510.

In the figure, reference numeral 1 denotes a yoke containing an excitation coil 2, and a pair of symmetrical magnetic pole portions 3m are provided on the inner circumference of the yoke.

3b. 4 and 5 are brackets respectively attached to both ends of the yoke 1; 6 is a rotor having a cylindrical portion; this rotor is integrally connected to a rotor shaft 7 that is dynamically connected to a rotating body (not shown); The rotor shaft is supported by a bracket 5 via a bearing 8.

Reference numeral 9 denotes a non-magnetic blocking ring interposed in the center of the cylindrical portion of the rotor 6, which magnetically divides the cylindrical portion into left and right sides. 10 is a plate that closes the opening of the cylindrical portion of the rotor 6; 11 is an internal stator fixed to the bracket 4 via a heat exchanger 13, which will be described later; the outer peripheral surface of this stator and the rotor The cylindrical gap between the inner peripheral surfaces of the cylindrical portion 6 is filled with magnetic powder 12. Reference numeral 13 denotes a hollow cylindrical sealed tube 14, and a porous material made of, for example, yarn, woven fabric, non-woven fabric, web, or metal fiber, which is attached to the inner circumferential wall of the sealed tube to cause capillary action. This heat exchanger is composed of a wick 15 made of a material 9 and a working fluid 16 with evaporability such as water, alcohol, or ammonia sealed inside under reduced pressure. The powder is fixed to the bracket 4 at the middle part in the direction, and the powder is attached to the center of the stator 11 at the inner end thereof, whereby the stator 11 and the heat exchanger 13 are integrally connected. The outer end of the heat exchanger projects into the atmosphere. 17 is a cooling fin provided at the outer end of the sealed tube 14; 18 is an annular wire mesh for tightly adhering the wick 15 to the inner circumferential wall of the sealed tube 14; 19 is a space inside the heat exchanger 13; be.

Next, the operation will be explained. By supplying power to the excitation coil 2, a magnetic flux is generated whose magnetic path is shown by the dotted line, which magnetizes and solidifies the magnetic powder 12, and as a result, the rotor 6
Since the rotor 6 and the stator 11 are dynamically connected, braking is applied to the rotor 6 side, and thus to the braked body connected thereto. By the way, during this braking, heat proportional to the braking torque and the rotational speed of the rotor 6 is generated in the magnetic powder 12 and the operating parts of the rotor 6 and stator 11 that are in contact with the magnetic powder. This heat is then released to the outside by a heat exchanger 13 located at the center of the stator 11.

[Problem that the invention seeks to solve]

Since the conventional cooling structure of this type of braking device is configured as described above, the heat source and the heat exchanger are too far apart, resulting in a considerable temperature gradient, and the heat receiving area of the stator and heat exchanger is reduced. 9, and the coupling area between the cooling fins and the heat exchanger is narrow, making it impossible to install the cooling fins effectively.
Only the stator is cooled, and the rotor and excitation coil are hardly cooled, and only one heat pipe can be attached, so there is a problem that sufficient cooling is not achieved.

This invention was made to solve the above-mentioned problems, and it is possible to efficiently cool the entire device without requiring an external cooling medium, thereby obtaining a braking device with a large heat capacity. The purpose is to

[Means for solving problems]

In the braking device according to the present invention, heat pipes with cooling fins are disposed in the stator, rotor, and excitation coil portions, respectively, and a blower is disposed to supply cooling air to the cooling fins.

[Effect]

The heat pipe according to the present invention cools the rotor and stator in a well-balanced manner using the cooling fins and the blower, and can significantly increase the heat capacity.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, 1 to 8 are the same as those shown in FIG. The cylindrical gap between the outer peripheral surface of the stator and the inner peripheral surface of the cylindrical portion of the rotor 6 is filled with magnetic particles 12 . 13 is a hollow cylindrical sealed tube 14, and a wick 15 attached to the inner circumferential wall of this sealed tube for causing capillary action;
and an evaporative working fluid 16 sealed inside under reduced pressure.
This heat pipe 13 is attached to the center of the stator 11 at the inner end of the sealed tube 14, and the outer end thereof is provided with cooling fins 17. A blower 23 is arranged outside to supply cooling air to the cooling fins. Next, reference numeral 20 denotes a plurality of heat pipes disposed near the operating portion of the rotor 6, and numeral 24 denotes a plurality of heat pipes disposed around the outer periphery of the excitation coil 2.
5. Consists of cooling fins 22, 26, etc.

Next, the operation will be explained. By supplying power to the excitation coil 2, a magnetic flux is generated whose magnetic path is indicated by the dotted line, which magnetizes and solidifies the magnetic particles 12, and as a result, the rotor 6
Since the stator 11 and the rotor 6 are dynamically connected, the rotor 6
side, and therefore the braked body connected thereto.

By the way, the frictional heat generated during braking is transferred to the outside via the cooling fins 22, 17, and 26 by the heat pipe 20 on the rotor 6 side, the heat pipe 13 on the stator 11 side, the heat pipe 24 on the coil side, and the blower 23. It will be released more efficiently.

In the above embodiment, the cooling fins 22 of the rotor-side heat pipe 20 are provided only at one end of the sealed tube, but if the sealed tube is extended to the other end and cooling fins are provided at both ends, Furthermore, the cooling effect is improved.

〔Effect of the invention〕

As described above, according to the present invention, heat pipes with fins are provided near the operating part of the rotor, near the excitation coil, and on the stator, and a blower is provided to cool the cooling fins. The heat generated in the operating part is released from each heat pipe to the outside through the cooling fins in a well-balanced manner, so that the entire braking device can be effectively cooled and a device with a large heat capacity can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a magnetic particle type electromagnetic braking device according to an embodiment of the present invention, and FIG. 2 is a sectional view showing a conventional device. In the figure, 1 is a yoke, 2 is an excitation coil, 6 is a rotor, 7 is a rotating shaft, 11 is an internal stator, 12 is a magnetic particle, 13.2
0.24 is the heat pipe, 16.21.25 is the working fluid,
]7.22.26 is a cooling fin, and 23 is a blower. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (2)

[Claims] (1) A rotor disposed on the outer peripheral surface of the stator through an annular gap, magnetic particles loaded in the gap, and by magnetizing the magnetic particles, braking torque is generated between the stator and rotor. The evaporator is installed near the braking surface of the rotor, near the excitation coil, and at the center of the stator, and has cooling fins at the outer end, and an evaporator sealed inside under reduced pressure. 1. A magnetic particle type electromagnetic braking device comprising: a heat pipe having a working fluid having a magnetic property; and a blowing means for supplying cooling air to the cooling fins. (2) The magnetic particle type electromagnetic braking device according to claim 1, wherein a plurality of heat pipes are disposed in close contact with the outer periphery of the excitation coil.