JPH0328532A - Electromagnetic brake - Google Patents

Abstract

PURPOSE:To reduce the time to manufacture a stator by separately forming the stator as a stator main body having a recessed part to install an exciting coil and an amrature support member provided with a plural number of arms in one body. CONSTITUTION:A stator 21 is constituted with a stator main body 22 and a fitting plate 23. The stator main body 22 is formed im an annular shape by processing a plate material with pressure. The fitting plate 23 is provided with a fixed part 23a to be fixed on the bottom part of the stator main body 22 and three armature support arms 23b set in one body on this fixed part 23. An a mature 24 is supported free o slide in the lengthy direction by the arm 23b. A b ake plate 25 is fixed on the arm 23b. Consequently, the time required to manufacture a statorcan be reduced and it is possible to keep the manufacturing cost low.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a non-excitation type electromagnetic braking device used in industrial machinery, robots, etc.

[Conventional technology]

Conventional electromagnetic braking devices of this type have been constructed as shown in FIGS. 4 to 6.

FIG. 4 is a side sectional view showing a conventional electromagnetic braking device, FIG. 5 is a sectional view of the braking device portion, and FIG. 6 is a front view of a conventional stator. In these figures, l is motor, 2
is the rotating shaft of this motor l, and a hub 4 for rotating the lining 3 together with the rotating shaft 2 is fixed to the shaft end portion of the rotating shaft 2. Note that the lining 3 is provided so as to be movable in the axial direction with respect to the hub 4. 5 is a stator of an electromagnetic braking device, this stator 5 is made of low carbon steel, and has a hollow portion 5a through which the rotating shaft 2 passes;
The coil 6 has an annular shape having a recess 5b into which a resin 7 is inserted, and is fixed to the motor 1 via a bolt 8 inserted into a mounting hole 5c.

Note that 5d is the outer pole of the stator 5, and 5e is the inner pole. In addition to the mounting hole 5C, the stator 5 also has a screw hole 5f into which a bolt for supporting an armchair, which will be described later, is screwed, and a spring hole into which a spring, which will be described later, is inserted, as shown in FIG. 5g. Holes 5h, etc., into which cover fixing bolts (described later) are inserted, are provided in the outer pole 5d, respectively. In addition, each hole 5c
, 5f, 5g. 5h are provided at three locations along the circumferential direction of the stator 5 at predetermined intervals.
Reference numeral 9 denotes an armature that is magnetically attracted to the stator 5, and this armature 9 has a gap g at the axial end of the stator 5.
are opposed to each other via a port 10, and are supported movably in the axial direction of the stator 5 via a pusher 11 fixed to the stator 5 by a port 10. Note that this bolt 10 is screwed into a screw hole 5f of the stator 5. 12 is a brake plate for braking the lining 3 together with the armchair 9; this brake play port 2 is connected to the lining 3;
The motor is located on the opposite side of the motor, and the said bolt}1
It is fixed to the stator 5 by 0. 13 is a spacer for adjusting the size of the gap g; 14 is a spring for biasing the armature 9 toward the lining 3 when not energized; this spring 14 is formed by a compression coil spring; one end is attached to the armature; 9
The three spring holes 5 of the stator 5 are in contact with the
Each bullet is loaded in g. l5 is the stator 5,
Armature9. Lining 3 and brake plate 12
This cover 15 covers the hole 5h of the stator 5.
It is fixed to the motor 1 via a bolt 16 inserted inside. In addition, the broken line Φ in Fig. 4 indicates the magnetic path. next,
The operation of a conventional electromagnetic braking device configured as described above will be explained. First, when a voltage is applied to the coil 6 by a power supply (not shown), a magnetic flux is generated along the magnetic path indicated by the broken line Φ in FIG.
is magnetically attracted to the stator 5 against the force of the spring 14.

That is, at this time, the braking force is released in the lining 3, and when voltage is applied to the motor I, the rotating shaft 2 is rotated together with the hub 4 and the lining 3. Further, when the power supply to the motor 1 and the coil 6 is stopped, the armature 9 is no longer magnetically attracted to the stator 5 and is pressed against the lining 3 by the force of the spring 14. That is, lining 3
is sandwiched between the armature 9 and the brake plate 12, and thereby a braking force is applied to the rotating shaft 2, and the rotation of the rotating shaft 2 is stopped. Generally, such an electromagnetic braking device is used as a safety brake because braking torque is generated by the elastic force of the spring 14 and the brake is automatically applied in the event of a power outage. In addition, when this type of trI11 braking device is used as a brake motor such as a servo motor, and when used in a robot etc., it is necessary to downsize the motor 1 and the braking device.
The weight was reduced, and the outer diameter of the motor 1 and the outer diameter of the braking device were designed to be approximately equal in size.

[Problem to be solved by the invention]

However, in the conventional electromagnetic braking device configured as described above, each hole 5 c + 5 f + is provided in the stator 5.
5g + 5h, etc., and the area of the outer pole 5d through which the magnetic flux passes must be designed excluding the opening area of each hole, resulting in an increase in the size of the stator 5.

Moreover, when manufacturing the stator 5, it takes a lot of time to drill each hole, and it is also necessary to finish the burrs formed on the opening edge of each hole. manufacturing costs were increasing. In order to solve this problem, the number of holes provided in the stator 5 can be reduced by placing the bolts 8, 10, 16, etc. on the outer circumference of the stator 5, but in this way, the braking device itself It becomes larger. Furthermore, especially in small electromagnetic braking devices, the recess 5b into which the coil 6 is loaded is formed into the stator 5 by cutting, and since the stator 5 is made of low carbon steel, it is difficult to machine the recess 5b. Also, it took a lot of time to process the recess 5b. Furthermore, during assembly, a spacer 13 must be inserted between the pusher 11 and the brake plate 12 to adjust the size of the gap g so that the gap g between the armature 9 and the stator 5 is constant. This made the work complicated and took a lot of time to assemble. [Means for Solving the Problems] The ilT111M motion device according to the present invention includes a stator, an annularly pressurized stator body having a concave portion into which an excitation coil is mounted, and an armature that is attached to the stator body. A plurality of arms are integrally provided with a plurality of arms that are movably supported by the armature support member. It is made by bending and forming it, and a brake plate is fixed to the tip.

[For production]

Since machining such as drilling is not required when manufacturing the stator, the stator manufacturing operation is simplified.

〔Example〕

Hereinafter, one embodiment of the present invention will be explained in detail with reference to FIGS. 1 to 3. FIG. 1 is a sectional side view showing an electromagnetic braking device according to the present invention, FIG. 2 is a side view showing the main parts, and FIG. 3 is a front view. In these figures, the same or equivalent members as those explained in FIGS. 4 to 6 are given the same reference numerals, and detailed explanations will be omitted here. 1 to 3, 21 is a stator used in the electromagnetic braking device of the present invention, and this stator 2l includes a stator wooden body 22 and a mounting plate 23 fixed to this stator wooden body 22. It is fixed to the motor 1 with a mounting bolt 8. The stator main body 22 is formed into an annular shape by pressing a plate material, and the annular portion has a U-shaped cross section with a recess 22a into which the coil 6 is loaded via the resin 7. There is. The mounting plate 23 also includes a fixing portion 23a fixed to the bottom portion of the stator wooden body 22 by welding or the like, and a fixing portion 23a fixed to the bottom portion of the stator wooden body 22 by welding or the like.
Three armchair support arms 2 are integrated into a.
3b, and each arm 23b is formed by bending and forming the elongated direction parallel to the axial direction of the stator body 22 on the outer peripheral side of the stator wooden body 22. 2
Reference numeral 4 designates an armature, and the armature 24 has a guide 24a on its outer periphery into which the arm 23b is inserted. This armature 24 is connected to the guide 24.
By passing arm 23b through a, arm 23b
The stator main body 22 is slidably supported along its longitudinal direction, and is opposed to the axial end of the stator main body 22 with a gap g interposed therebetween. Reference numeral 25 denotes a brake plate, and the brake plate 25 is fixed to the arm 23b by press-fitting the tip of the arm 23b into its outer circumference. Reference numeral 26 denotes a brake spring for pressing the armature 24 against the lining 3 when not energized. There is. Note that the structure, mounting position, etc. of the braking spring that biases the armature 24 are not limited to those described above; if the gap between the hollow part of the stator body 22 and the rotating shaft 2 is large, A compression coil spring (not shown) is attached to the rotation shaft 2 within this gap.
The compression coil spring may be elastically mounted between the fixed portion 23a of the mounting plate 23 and the armature 24.

In the electromagnetic braking device configured in this manner, when the coil 6 is excited, the armature 24 is moved along the arm 23b of the stator 2l and is magnetically attracted to the stator wooden body 22. Further, when the power supply to the motor 1 and the coil 6 is stopped, the armature 24 is no longer magnetically attracted to the stator body 22 and is pressed against the lining 3 by the elastic force Ia of the web spring 26. Therefore, according to the present invention, the stator wood body 22 can be shaped by pressing a plate material, and therefore can be manufactured without performing any cutting process such as drilling holes. Furthermore, in the case of the mounting plate 23, it is possible to bend and form the plate material in the same way as the stator wooden body 22, so that the arm 23b can be provided parallel to the axial direction of the stator wooden body 22, and the armature 24 can also be provided. The guide 24a
Since the stator 21 can be assembled by simply inserting the arm 23b into the stator 21, machining such as cutting is almost unnecessary when manufacturing the stator 21. In manufacturing the stator wooden body 22, its outer diameter is set large enough not to interfere with the bolts 8 for attaching the stator wooden body 22 to the motor l, the bolts 16 for fixing the cover 15, etc. Needless to say, keep it.

Although this embodiment shows an example in which the armature 24 is supported by three arms 23b, the present invention is not limited to such a limitation, and the number of arms 23b can be changed as appropriate. Further, since the electromagnetic braking device according to the present invention has a structure in which the armature 24 is directly supported by the arm 23b of the stator 21, the push that was conventionally used is no longer necessary, and the lining 3 is not interfered with by the push. The diameter can be increased. Therefore, since the area of the friction surface is increased, the coil 6 can be made smaller, or the outer diameter of the stator wood body 22 can be set smaller.

〔Effect of the invention〕

As explained above, the electromagnetic braking device according to the present invention includes a stator, a stator main body which is press-molded into an annular shape having a recessed part in which an excitation coil is mounted, and an armchair that is movable with respect to the stator main body. The armature support member has a plurality of arms supporting the armature, and
The arm was bent on the outer periphery of the stator body so that its longitudinal direction was parallel to the axial direction of the stator body, and the brake plate was fixed to the tip of the arm, so it was necessary to drill holes when manufacturing the stator. Since cutting operations such as the above are not required, the manufacturing work of the stator is simplified. Therefore, the time required to manufacture the stator is shortened, and manufacturing costs can be kept low.

[Brief explanation of drawings]

FIG. 1 is a side sectional view showing an electromagnetic braking device according to the present invention, FIG. 2 is a side view showing the main parts, FIG. 3 is a front view, and FIG.
This figure is a side sectional view showing a conventional electromagnetic braking device, FIG. 5 is a sectional view of a portion of the braking device, and FIG. 6 is a front view of a conventional stator. 2... Rotating shaft, 3... Lining, 6...
Coil, 21... Stator, 22... Stator body, 23... Mounting plate, 23b... Arm, 24... Armchair, 25... Braking plate.

Claims (1)

[Claims] a stator that includes an excitation coil and magnetically attracts the armature; a braking spring that presses the armature against a friction plate of a braked shaft provided coaxially with the stator when not energized; In the electromagnetic braking device, the electromagnetic braking device includes a braking plate fixed to the armature and sandwiching the friction plate together with the armature, the stator body being pressure-formed into an annular shape having a recess into which an excitation coil is mounted. and an armature support member integrally provided with a plurality of arms movably supporting the armature with respect to the stator body, and the arms are fixed in their longitudinal direction to the outer peripheral side of the stator body. An electromagnetic braking device characterized in that the braking plate is bent and formed parallel to the axial direction of the child body, and the braking plate is fixed to the tip of the child body.