JPH065368U - Motor with built-in electromagnetic brake - Google Patents

Abstract

(57) [Summary] [Structure] In the electromagnetic brake built-in type motor having the electromagnetic brake 10 installed on the anti-load side bracket 8 and the rotation detector 11 at the anti-load side shaft end of the rotary shaft 5, the electromagnetic brake 10 is provided. A magnetic induction path 16 is provided between the rotation detector 11 and the rotation detector 11. [Effect] The amount of leakage magnetic flux generated from the electromagnetic brake transmitted to the rotation detector installed at the end of the rotating shaft can be greatly reduced without increasing the number of parts and manufacturing man-hours, which adversely affects the rotation detector. Can be eliminated.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a small-sized motor having a built-in electromagnetic brake.

[0002]

[Prior art]

 A conventional electromagnetic brake built-in motor is as shown in FIG. In the figure, 1 is a stator core supported in a frame 2, 3 is a stator winding wound around the stator core, 4 is a magnet fixed to a rotating shaft 5, and 6 is a load side bracket. A bearing 7 for supporting the load side of the rotary shaft 5 is provided, and the bearing 7 is fitted and fixed to one end of the frame 2. Reference numeral 8 denotes a counter-load side bracket, which has a bearing 9 for supporting the counter-load side of the rotary shaft 5 and is fixedly fitted to the other end of the frame 2. Reference numeral 10 denotes an electromagnetic brake, which is fitted and fixed to the anti-load side bracket 8. Reference numeral 11 denotes a rotation detector. The fixed portion 11a is attached to the non-magnetic detector mounting bracket 12 fitted and fixed to the anti-load side bracket 8, and the rotation portion 11b is attached to the shaft end of the rotary shaft 5. Fitted and fixed. A detector cover 13 is fitted and fixed to the detector and the mounting bracket 12. Arrows A to D indicate the flow of magnetic flux. In FIG. 2, the electromagnetic brake 10 is shown in a simplified manner for the sake of clarity, but the specific configuration of the electromagnetic brake 10 is as shown in FIG. That is, a spline boss 10b having a spline groove 10a on the outer circumference is fixed to the rotary shaft 5 with a key 10c or a snap ring 10d, and a brake plate 10f having linings 10e fixed on both sides is provided so as to be connected to the spline boss 10b. An armature plate 10g and a fixed plate 10h are provided on both sides of the brake plate 10f. The anti-load side bracket 8 is provided with a ring-shaped electromagnet 10J that is excited by the exciting coil 10i, attracts the armature plate 10g and separates it from the brake plate 10f, and separates the brake plate 10f pressed against the fixed plate 10h to separate the brake. To release. Further, the yoke portion 10k of the electromagnet 10j is provided with a spring 10l for pressing the armature plate 10g against the brake plate 10f so that the brake plate 10f is pressed against the fixed plate 10h when the brake is applied. A motor using the magnet 4 for the rotor magnetic pole normally uses the rotating shaft 5 as a magnetic circuit, so a magnetic material is used for the rotating shaft 5, but in the electromagnetic brake built-in type motor, the electromagnetic brake 10 is used. The leakage magnetic flux is transmitted through the rotating shaft 5 and adversely affects the detector 11 installed at the end of the rotating shaft. For this reason, conventionally, as shown in FIG. 4, a non-magnetic material is used for the anti-load side bracket 8 to which the brake is attached, the frame 2 and the rotary shaft 5, and a space 14 is provided by air to surround the brake 10. By providing a magnetically shielded area at the bottom, transmission of leakage magnetic flux is reduced.

[0003]

[Problems to be solved by the device]

 However, in such conventional technology, in order to miniaturize the electromagnetic brake built-in type motor and increase the output, the magnetic flux leakage increases as the electromagnetic brake, which is one of the constituent elements, becomes smaller and the output increases. Therefore, there is a problem that the rotation detector is magnetically adversely affected. Therefore, it is necessary to expand the shielded area against the leakage magnetic flux, which hinders the downsizing of the motor. Further, if a non-magnetic material is used for the rotating shaft 5, it is necessary to attach the sleeve 15 using a magnetic material to the portion where the magnetic circuit is formed, which causes an increase in the number of parts and manufacturing steps. The present invention has been made in order to solve such a problem, and an electromagnetic brake built-in type motor in which the leakage magnetic flux of the electromagnetic brake 10 is prevented from being transmitted to the rotation detector 11 installed at the end of the rotating shaft. It is intended to be provided.

[0004]

[Means for Solving the Problems]

 In order to solve the above problems, the electromagnetic brake built-in type motor of the present invention is an electromagnetic brake built-in type motor in which an electromagnetic brake is installed on the anti-load side bracket and a rotation detector is provided at the anti-load side shaft end of the rotating shaft. A magnetic guide path is provided between the electromagnetic brake and the rotation detector.

[0005]

[Action]

 By the above means, the leakage magnetic flux generated by the electromagnetic brake flows toward the magnetic induction path made of a magnetic material, and therefore hardly flows to the rotation detector 11.

[0006]

【Example】

 An embodiment of the present invention will be described below with reference to FIG. In FIG. 1, the same reference numerals as those in FIGS. 2 to 4 denote the same or corresponding parts, and the description thereof will be omitted. The overall structure of the motor is almost the same as that of the conventional example shown in FIG. 2, but a magnetic guide path 16 is attached to the detector mounting bracket 12. The magnetic guide path 16 is formed of, for example, a magnetic guide cover, and the inner peripheral side is axially opposed to the step end surface of the rotary shaft 5. In such a configuration, the magnetic flux generated by the electromagnetic brake 10 concentrates on the end face of the rotating shaft 5 on the side opposite to the load and is guided in the outer peripheral direction of the magnetic guide path 16 installed on the end face. The magnetic flux at the position is greatly reduced. Further, since the magnetic guide path 16 also has a sealing function, it is possible to prevent dust on the electromagnetic brake 10 side from flowing into the rotation detector 11 side. The arrow E indicates the flow of magnetic flux.

[0007]

[Effect of device]

 As described above, the present invention has the following effects. (1) Since the magnetic induction path made of magnetic material is provided between the electromagnetic brake and the rotation detector, the leakage magnetic flux generated from the electromagnetic brake can be generated at the end of the rotating shaft without increasing the number of parts and manufacturing man-hours. The amount transmitted to the rotation detector installed in the can be greatly reduced, and the adverse effect on the rotation detector can be eliminated. (2) By attaching the magnetic guide path, dust on the electromagnetic brake side can be prevented from flowing into the rotation detector side.

[Brief description of drawings]

FIG. 1 is a side sectional view of an upper half part showing an embodiment of the present invention.

FIG. 2 is a side sectional view of an upper half portion showing a first conventional example.

FIG. 3 is a side sectional view showing details of an electromagnetic brake.

FIG. 4 is a side sectional view of an upper half part showing a second conventional example.

[Explanation of symbols]

1 Stator core 2 Frame 3 Stator winding 4 Magnet 5 Rotating shaft 6 Load side bracket 7 Load side bearing 8 Anti-load side bracket 9 Anti-load side bearing 10 Electromagnetic brake 11 Rotation detector 12 Detector mounting bracket 13 Detector cover 14 space 15 sleeve 16 magnetic guideway

Claims (1)

[Scope of utility model registration request] 1. An electromagnetic brake built-in type motor having an electromagnetic brake installed on an anti-load side bracket and having a rotation detector at an anti-load side shaft end of a rotary shaft, wherein the electromagnetic brake is provided between the electromagnetic brake and the rotation detector. , An electromagnetic brake built-in motor characterized by having a magnetic guide path.