JPH0419432A - Electromagnetic brake or electromagnetic clutch mainly composed of no-excitation action - Google Patents

Abstract

PURPOSE:To obtain inexpensiveness and high torque in small size by providing a magnet coil assembly unit which comprises an annular plastic permanent magnet movable in the axial direction having an external ring part formed in a section of squared shape with one side open by opening one end part in the axial direction, anular electromagnetic coil and a resetting leaf spring. CONSTITUTION:An electromagnetic brake has a magnet coil assembly unit and an armature 15. The magnet coil assembly unit comprises an annular plastic permanent magnet 11 movable in the axial direction having an external ring part formed in a section of squared shape with one side open by opening one end part in the axial direction, annular electromagnetic coil 12 fixedly housed in a space part of squared section with one side open of the magnet 11 and a ring-shaped resetting leaf spring 13 for resetting the magnet 11. The armature 15 is fixed to an armature hub 14 opposedly arranged with a small gap apart to an opening end part of the magnet 11. The ring-shaped resetting leaf spring 13 is provided with a permanent magnet mounting hole in three-equally divided positions in the circumferential direction in a ring external edge and also resettably displacing the magnet coil assembly unit in the axial direction. Action is in accordance with the conventional 13 one.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electromagnetic brake or an electromagnetic brake notch that mainly operates without excitation.

[Prior Art] A conventional operating brake that mainly operates without excitation is configured as shown in FIG. 3(A), for example, and its structure can be roughly divided into a rotating part and a fixed part. The rotating part consists of an armature assembly and an armature hub 1, the armature assembly consists of a return leaf spring 2, a rivet 3, a bolt 4, and an armature 5, and the fixed part consists of a permanent magnet 6 and an electromagnetic coil 7. It is constructed around a magnet coil assembly, and is fixed to a machine frame (not shown) by a flange 8.

Next, let's look at the operation of the electromagnetic brake in Figure 3 (A).
This will be explained with reference to Figures (B) and (C).

FIG. 3(B) is an explanatory diagram when the brake is activated. When the electromagnetic coil 7 is not energized, the armature 5 is attracted by the magnetic flux of the permanent magnet 6, and a certain braking action is exerted.

FIG. 3(C) is an explanatory diagram when the brake is released. When the electromagnetic coil 7 is energized, the magnetic flux from the electromagnetic coil 7 follows a magnetic path in the opposite direction so as to cancel the magnetic flux of the permanent magnet 6 acting on the friction surface. Form. When the excitation current reaches a certain value or more,
The magnetic flux of the permanent magnet 6 is canceled out by the reverse magnetic flux of the trji coil 7, the attractive force between the armature 5 and the permanent magnet 6 disappears, the armature 5 is released, and the brake is released.

Although the electromagnetic brake, which is mainly operated without excitation, has been described above with reference to FIGS. 3(A) to 3(C), the electromagnetic clutch can also be considered in the same way.

[Problem to be solved by the invention] In conventional actuated brakes that mainly operate without excitation, the armature assembly is movable in the axial direction and the magnet coil assembly is fixed in the axial direction. A problem has arisen in that it may be desirable to have a coil assembly that is axially movable and an armature assembly that is partially axially fixed.

Furthermore, the conventional brake keys are required to be cheaper, smaller, and have higher torque, but there is a problem in that they are not necessarily sufficient at present.

1. Means for Solving the Problems] The present invention has been made to solve the above-mentioned problems, and as a first invention, there is provided an outer structure having an open end in the axial direction and a cross-sectional shape. an annular plastic permanent magnet having a ring portion and movable in the axial direction; an annular electromagnetic coil housed and fixed in a cavity having a cross-section of the plastic permanent magnet; and a ring-shaped electromagnetic coil for returning the plastic permanent magnet to its original position. A magnet coil assembly consisting of a return leaf spring, and an armature that is arranged oppositely to the open end of the plastic permanent magnet with a small gap therebetween and is fixed to an armature hub. A second invention provides a brake or an electromagnetic clutch; , a backing plate fixed to the open end of the sintered metal permanent magnet, an annular electromagnetic coil housed and fixed in a cavity with a cross-section of the sintered metal permanent magnet, and the sintered metal permanent magnet An electromagnetic brake or an electromagnetic brake mainly operated without excitation, which has a magnet coil assembly consisting of a return leaf spring for returning the vehicle to its original position, and an armature that is arranged opposite to the abutment plate with a small gap therebetween and is fixed to an armature hub. It is intended to provide a clutch.

[Example] Hereinafter, an example of an electromagnetic brake mainly based on non-excitation operation according to the present invention will be described with reference to FIGS. 1(B) and 2(A1(B)).

In this embodiment, an electro-grinding flange mainly operated by non-excitation will be explained, or an electromagnetic flanch mainly operated by non-excitation can be considered in the same way.

FIGS. 1(A) and 1(B) show a first embodiment of the present invention, and the electromagnetic brake mainly operates without excitation.
An outer ring with an open end in the axial direction and a cross-sectional shape? It has an annular alastic permanent magnet 11 that is movable in the axial direction, an annular TL magnetic cocoil 12 that is housed and fixed in a cavity with an opening-shaped cross section of the plastic permanent magnet 11, and a ring-shaped TL magnetic co-coil 12 for making the plastic permanent magnet 11 1ti44. a magnet coil assembly consisting of a return/sweeping plate spring 13;
It has an armature 15 fixed to an armature hub 14 and arranged opposite to the open end of the plastic permanent magnet 11 with a small gap therebetween.

Further, as shown in FIG. 1(B), the ring-shaped return leaf spring 13 has permanent magnet mounting holes provided at the outer edge of the ring at three equal thirds in the circumferential direction. A mounting member mounting hole is provided at an intermediate position of the mounting holes, so that the magnet coil assembly can be reversibly displaced in the axial direction with respect to the mounting member 16.

The operation of the electromagnetic brake shown in FIGS. 1A and 1B can be considered in accordance with the operation of the conventional electromagnetic brake described with reference to FIGS. 3A to 3C.

2(A) and 2(B) show a second embodiment of the present invention, except that the plastic permanent magnet 11 in FIG. 1(A) is a sintered metal permanent magnet 21. Figure 1 <A
) (B), in which case the sintered metal permanent magnet 21 is likely to break, so a patch plate 22 is provided at the open end of the sintered metal permanent magnet 21 to prevent this. I try to make it stick.

The backing plate 22 has an outer ball 22a and an inner ball 22b arranged concentrically so as to correspond to the outer circumference and inner circumference of the open end of the sintered metal permanent magnet 21, respectively, and the two concentric balls 22a. , 22b is provided with a window 22 for concentrating the magnetic force on the balls 22a, 22b.
c is provided.

[Effects of the Invention] The electromagnetic brake or electromagnetic clutch according to the present invention, which is mainly operated without excitation, eliminates the permanent magnets that were conventionally arranged separately and in parallel, and instead, the magnetic poles of the electromagnets are made of plastic permanent magnets. As a result, the space in the axial direction is reduced, resulting in a compact and inexpensive structure, and it is also possible to meet the requirements for high torque with a reduced magnetic circuit length.

Further, by making the plastic permanent magnet movable in the axial direction and providing a return spring as in the present invention, the five-arm assembly can be made into a structure fixed in the axial direction.

[Brief explanation of drawings]

FIG. 1(A) is a half-sectional side view of a first embodiment of an electromagnetic brake mainly based on non-excitation operation according to the present invention, and FIG. 1(B)
1(A) is a left front view of the return leaf spring included in the electromagnetic brake of FIG. 1(A), and FIG. 2(A) is a half-sectional side view of a second embodiment of the electromagnetic brake mainly based on non-excitation operation according to the present invention. Figure, Figure 2 (B)
is a right front view of the cover plate included in the electromagnetic brake in Fig. 2 (A), Fig. 3 (A> is a half-sectional side view of a conventional electromagnetic brake that mainly operates without excitation, and Fig. 3 (B) is an explanatory diagram of the operation of the electromagnetic brake in Fig. 3 (A) when the brake is applied, and Fig. 3 (C) is an explanatory diagram of the operation of the electromagnetic brake in Fig. 3 (A) when the brake is released. Yes. Armature hub return leaf spring Rivet bolt Armature permanent magnet Electromagnetic coil flange 11... 16... 2 a 22 b 22 c Plastic permanent magnet Electromagnetic coil return leaf spring Armature hub Armature mounting member Sintered metal permanent magnet Backplate outer ball-in/ten-bow J window

Claims (1)

[Scope of Claims] 1. An annular plastic permanent magnet that is movable in the axial direction and has an outer ring portion that is open at one end in the axial direction and has a U-shaped cross section; A magnet coil assembly consisting of an annular electromagnetic coil housed and fixed in a letter-shaped cavity, a return leaf spring for returning the plastic permanent magnet, and a small gap separated from the open end of the plastic permanent magnet. An electromagnetic brake or an electromagnetic clutch mainly operated without excitation, characterized by having an armature that is arranged opposite to each other and fixed to an armature hub. 2. An annular sintered metal permanent magnet that is movable in the axial direction and has an outer ring portion that is open at one end in the axial direction and has a U-shaped cross section; A magnet comprising a fixed backing plate, an annular electromagnetic coil housed and fixed in a space having a U-shaped cross section in the sintered metal permanent magnet, and a return leaf spring for returning the sintered metal permanent magnet. An electromagnetic brake or an electromagnetic clutch mainly operated without excitation, comprising a coil assembly and an armature arranged opposite to the abutment plate with a small gap therebetween and fixed to an armature hub.