JPH0223092Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a motor with an electromagnetic brake, and particularly to its cooling structure.

[Prior Art] Conventionally, in this type of motor, the brake plate and the electromagnet were positioned so as to block one end of the motor, resulting in poor air flow. Particularly in machines such as industrial sewing machines that rotate and stop frequently, not only the motor but also the brake plate become extremely hot.

[Problem to be invented or solved] Therefore, in the past, this type of motor had problems in that it was difficult to release heat, resulting in phenomena such as overheating of the motor and deterioration of braking performance.

[Purpose of the invention] The present invention was made to solve the above-mentioned problems, and its purpose is to improve the cooling efficiency of the motor, electromagnet, and brake plate portions.

[Means for Solving the Problems] In order to achieve the above object, the present invention includes a ventilation passage of the motor outer box, an electromagnet and a brake plate having a central hole provided to communicate with the ventilation passage. , a rotary plate that supports a brake plate with a notch that communicates from the central hole, and a pulley that has a plurality of blades extending radially on the surface of the rotary plate, and the ventilation passage and the central hole , a series of passages are formed by the notches.

[Operation] In the above configuration, by rotating the pulley, cooling air flows smoothly through the series of passages, improving cooling efficiency.

[Example] An example of this invention will be described below with reference to the drawings.

Reference numerals 2 and 3 denote an outer case of the motor 1, which is composed of two parts divided in the axial direction, and connected by screws 4. 2a and 3a are end walls formed near both ends of each of the outer boxes 2 and 3 at a distance from the outer circumferential wall of the outer case, and have a bearing in the center. A cylindrical casing 5 is clamped and fixed between the end walls 2a and 3a, and a stator 6 is fixed to the inner surface of the cylindrical casing.
Reference numeral 7 denotes a ventilation passage formed between the outer surface of the cylindrical casing 5 and the outer peripheral walls of the outer boxes 2 and 3, and has openings 7a and 7b formed at both ends in the axial direction. A rotor 8 is fixed to a rotating shaft 14 rotatably supported by bearings on the end walls 2a and 3a.

Reference numeral 9 denotes an electromagnet, which includes a ring-shaped frame 9a with a U-shaped cross section, a coil 9b placed in a recess in the frame, and a ring-shaped friction plate 10 attached to the frame 9a to cover the coil 9b.
The outer surface of the friction plate 10 forms a braking surface. The electromagnet 9 is attached to one of the outer boxes 3
The opening 7b of the ventilation passage 7 is mounted with a screw 11 facing toward the outer periphery thereof. Therefore, the central hole 12a of the electromagnet 9 communicates with the ventilation passage 7.

Reference numeral 13 denotes a rotating plate fixed to a rotating shaft 14 with a nut 15, and has three arms 13a extending radially as shown in FIG. A notch 13b is also formed that is open radially outward.

A ring-shaped brake plate 16 is attached to the rotating plate 13 via a spring 17. The spring 17 is fixed to the arm 13a of the rotating plate with a rivet 18a, and is further fixed to the brake plate 16 between the arms 13a of the rotating plate with a rivet 18b. Therefore, the braking plate 16 is moved in the axial direction by the elasticity of the spring 17.

A stopper 19 is fixed to the rotary plate 13 with a screw 21, and controls the amount of movement of the brake plate 16 in the direction of the electromagnet 9. The stopper 19 has a cutout on the inner peripheral side at a location opposite to the cutout 13b of the rotating plate.

Reference numeral 20 denotes a plurality of washers, and by increasing or decreasing the number of washers, the gap between the brake plate 16 and the electromagnet 9 is adjusted.

Reference numeral 22 denotes a pulley, which has a plurality of blades 22a extending in the radial direction on the surface on the rotating plate 13 side.
is installed on. The pulley 22 is connected to an industrial sewing machine or the like via a belt (not shown).

As the pulley 22 rotates as the motor 1 rotates, air existing between the pulley 22 and the brake plate 16 is discharged to the outside by the action of the blades 22a. Due to the resulting negative pressure, cooling air flows in from the opening 7a, passes through the ventilation passage 7, and passes through the electromagnet 9.
It passes through the central hole 12a along the motor 1 side surface of the stopper 19, passes through the inner peripheral side notch of the stopper 19, passes through the central hole 12b of the brake plate and the notch 13b of the rotating plate, and flows outward along the brake plate 16. By doing so, the motor 1, electromagnet 9, and brake plate 16 are cooled.

[Effects of the invention] As described above, in the present invention, a central hole is provided in the electromagnet and the brake plate so as to communicate with the ventilation path inside the motor outer box, and a notch is also provided in the rotating plate that supports the brake plate. Because of this, not only the motor, but also the electromagnet and brake plate can be efficiently cooled, extending the life of the motor, electromagnet, and brake plate, and making it possible to maintain their original performance.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of an embodiment embodying the present invention, and FIG. 2 is an exploded perspective view of main parts. In the figure, 1 is a motor, 2 and 3 are motor outer boxes, 7 is a ventilation path, 9 is an electromagnet, 13 is a rotating plate, 14 is a rotating shaft, 16 is a brake plate, 22 is a pulley, and 22a is a blade.

Claims (1)

[Claims for Utility Model Registration] 1. A ventilation passage 7 formed in the motor outer boxes 2, 3 with both ends in the axial direction open; An electromagnet 9 having a ring-shaped braking surface fixed to one end of the outer boxes 2 and 3, a ring-shaped braking plate 16 located opposite to the braking surface of the electromagnet 9, and integrally attached to the rotating shaft 14 of the motor 1. The brake plate 16 is rotated by a spring 17.
The rotating plate 1 is supported movably in the axial direction through the rotary plate 1 and has a notch that communicates with the central hole of the brake plate 16.
3, and the rotating plate 1 with respect to the motor outer boxes 2 and 3.
The pulley 22 has a plurality of blades 22a extending in the radial direction on the surface facing the rotary plate 13, and is provided so as to rotate integrally with the rotary shaft 14 on the outside of the rotary plate 13. Therefore, a motor with an electromagnetic brake is characterized in that the flow of cooling air that has passed through the motor is passed through the central holes 12a and 12b of the electromagnet 9 and the brake plate 16 to cool both of them. 2. The electromagnetic brake according to claim 1, wherein the cutout of the rotary plate 13 is opened in the axial direction and the radial direction and releases cooling air along the end surface of the brake plate 16 on the side of the pulley 22. with motor.