JPH086769B2 - Electromagnetic brake or clutch mainly for non-excitation operation - Google Patents

Abstract

PURPOSE:To provide size smallness and inexpensiveness and further to cope with requirement of high torque by providing a magnet coil assembly unit which comprises an annular plastic permanent magnet, formed in a section of squared shape with one side open by opening one end part in the axial direction, and an annular electromagnetic coil fixedly housed in the above-mentioned space of square-shaped section with one side open. CONSTITUTION:An electromagnetic brake, mainly composed of no-excitation action, has a magnet coil assembly unit and an armature assembly unit. The magnet coil assembly unit comprises an annular plastic permanent magnet 11, opening one end part in the axial direction and having an external annular part formed in a section of squared shape with one side open, and an annular electromagnetic coil 12 fixedly housed in a space part of squared section with one side open of the plastic permanent magnet 11. The armature assembly unit comprises an armature 5 movable in the axial direction, opposedly arranged with a small gap to an opening end part of the plastic permanent magnet 11, and a resetting leaf spring 2 mounted over the armature 5 and an armature hub l. Action of this electromagnetic brake is substantially equal to action of the conventional electromagnetic brake.

Description

TECHNICAL FIELD The present invention relates to an electromagnetic brake or an electromagnetic clutch mainly for non-excitation operation.

[Prior Art] A conventional actuating brake mainly based on non-excitation operation 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 is composed of an armature assembly and an armature hub 1, and the armature assembly is composed of a return leaf spring 2, a rivet 3, a bolt 4 and an armature 5.
The rotating part is constructed around a magnet coil assembly composed of a permanent magnet 6 and an electromagnetic coil 7, and is fixed to a frame (not shown) of the machine by a flange 8.

Next, the operation of the electromagnetic brake of FIG. 3 (A) will be described with reference to FIGS. 3 (B) and (C).

FIG. 3 (B) is an explanatory diagram when the brake is operated, and when the electromagnetic coil 7 is not energized, the magnetic flux of the permanent magnet 6 attracts the armature 5 to exert a certain braking action.

FIG. 3 (C) is an explanatory diagram when the brake is released. When the electromagnetic coil 7 is energized, the magnetic flux of the electromagnetic coil 7 forms a magnetic path in the opposite direction so as to cancel the magnetic flux of the permanent magnet 6 acting on the friction surface. To do. When the exciting current reaches a certain value or more,
The magnetic flux of the permanent magnet 6 is canceled by the reverse magnetic flux of the electromagnetic 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 mainly based on the non-excitation operation has been described above with reference to FIGS. 3A to 3C, the electromagnetic clutch can be similarly considered.

[Problems to be Solved by the Invention] Conventional operating brakes mainly based on non-excitation operation require inexpensive and small high torque as a holding brake for small motors, stepping motors, servo motors, etc., but are not always sufficient at present. There was a problem.

[Means for Solving the Problems] The present invention has been made to solve the above-described problems, and as a first invention, an outer end formed in a U-shaped cross-section with one axial end opened. A magnet coil assembly comprising an annular plastic permanent magnet having an annulus and an annular electromagnetic coil housed and fixed in a space having a U-shaped cross section of the plastic permanent magnet, and a small-sized portion at the open end of the plastic permanent magnet. An electromagnetic brake mainly having a non-excitation operation having an axially movable armature arranged opposite to each other across a gap, and an armature assembly including a return leaf spring mounted over the armature and the armature hub. Alternatively, an electromagnetic clutch is provided, and as a second invention, an annular sintered metal permanent magnet having 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 comprising a backing plate fixed to the open end of the sintered metal permanent magnet, and an annular electromagnetic coil housed and fixed in a space having a U-shaped cross section of the sintered metal permanent magnet; Mainly for non-excitation operation having an armature, which is arranged opposite to a backing plate with a small gap and is movable in the axial direction, and an armature assembly composed of the armature and a return leaf spring mounted over the armature hub. It is intended to provide an electromagnetic brake or an electromagnetic clutch.

[Embodiment] An embodiment of an electromagnetic brake mainly based on non-excitation operation according to the present invention will be described below with reference to FIGS. 1 and 2A and 2B.

1 and 2 (A) (B), FIG. 3 (A)
The same parts as those of the conventional electromagnetic brake shown in FIG.

In the present embodiment, an electromagnetic brake mainly composed of non-excitation operation will be described, but an electromagnetic clutch mainly composed of non-excitation operation can be similarly considered.

FIG. 1 shows a first embodiment of the present invention, in which an electromagnetic brake whose main function is non-excitation is an outer ring portion having a U-shaped cross-section with one axial end open. A magnet coil assembly comprising an annular plastic permanent magnet 11 having an annular magnet coil and an annular electromagnetic coil 12 housed and fixed in a space of the plastic permanent magnet 11 having a U-shaped cross section, and a small size at the open end of the plastic permanent magnet 11. An armature 5 that is arranged opposite to each other with a gap in between and that is movable in the axial direction;
And an armature assembly consisting of a return leaf spring 2 mounted over the armature hub 1.

Regarding the operation of the electromagnetic brake in FIG. 1, FIG. 3 (A)
The operation is substantially the same as that of the conventional electromagnetic brake described with reference to FIGS.

2 (A) and (B) show a second embodiment of the present invention, which is shown in FIG. 1 except that the plastic permanent magnet 11 of FIG. 1 is a sintered metal permanent magnet 21. It is similar to that of the first embodiment shown, in which case a sintered metal permanent magnet 21 is used.
Is easy to crack, so to prevent it, sintered metal permanent magnet
The backing plate 22 is fixed to the open end of 21.

The contact plate 22 is concentrically provided so that the outer pole 22a and the inner pole 22b correspond to the outer peripheral portion and the inner peripheral portion of the open end of the sintered metal permanent magnet 21, respectively, and the two concentric poles 22a. , Magnetic pole in the middle of 22b
A window 22c is provided for focusing on 22a and 22b.

[Effects of the Invention] The electromagnetic brake or the electromagnetic clutch mainly based on the non-excitation operation according to the present invention is configured such that the permanent magnet, which is conventionally provided as a separate body, is omitted and the magnetic poles of the electromagnet are made of plastic permanent magnets. As a result, the space in the axial direction is reduced, the size and cost are reduced, and the magnetic circuit length is also reduced, which makes it possible to meet the demand for high torque.

[Brief description of drawings]

FIG. 1 is a half cross-sectional side view of a first embodiment of an electromagnetic brake mainly for non-excitation operation according to the present invention, and FIG. 2A is a second embodiment of an electromagnetic brake mainly for non-excitation operation according to the present invention. FIG. 2 (B) is a left front view of a backing plate included in the electromagnetic brake of FIG. 2 (A), and FIG. 3 (A) is an electromagnetic system mainly based on conventional non-excitation operation. FIG. 3 (B) is a side view of a half cross section of the brake, FIG. 3 (B) is an explanatory view of the operation of the electromagnetic brake of FIG. 3 (A) during brake operation, and FIG. 3 (C) is of the electromagnetic brake of FIG. 3 (A). It is explanatory drawing of the operation | movement at the time of brake release. 1 ... Armature hub 2 ... Return spring 3 ... Rivet 4 ... Bolt 5 ... Armature 6 ... Permanent magnet 7 ... Electromagnetic coil 8 ... Flange 11 ... Plastic permanent magnet 12 ... Electromagnetic coil 21 ... … Sintered metal permanent magnet 22 …… Attach plate 22a …… Outer pole 22b …… Inner pole 22c …… Window

Claims (2)

[Claims] 1. An annular plastic permanent magnet having an outer ring portion whose one end in the axial direction is open and which is formed in a U-shaped cross section, and is housed and fixed in a space of the C-shaped cross section of the plastic permanent magnet. A magnet coil assembly including an annular electromagnetic coil, an axially movable armature that is opposed to the open end of the plastic permanent magnet with a small gap, and is mounted over the armature and the armature hub. And an armature assembly composed of a return leaf spring and a non-excited electromagnetic brake or clutch. 2. An annular sintered metal permanent magnet having an outer ring portion whose one end in the axial direction is open and has a U-shaped cross section, and fixed to the open end of the sintered metal permanent magnet. A magnet plate, a magnet coil assembly comprising an annular electromagnetic coil housed and fixed in a U-shaped cavity of the sintered metal permanent magnet, and an axially arranged magnet plate assembly opposed to the contact plate with a small gap. An electromagnetic brake or an electromagnetic clutch mainly composed of non-excitation actuation, comprising: a movable armature; and an armature assembly including a return leaf spring mounted over the armature and the armature hub.