JPS6295960A - Motor with magnetic coupling - Google Patents

Abstract

PURPOSE:To miniaturize a device economically, by setting a dust-proof plate between a motor section and a magnetic coupling, and by making cooling air flow between ventilating slots arranged on the axis-directional end surface of a shield and on the outer peripheral surface. CONSTITUTION:A motor with a magnetic coupling is organized with a motor 10, a driving side yoke 15 fixed on a motor shaft 11 outside a motor shield 12, its permanent magnet 16, the partition plate 20 of non-magnetic substance, an output shaft 31 supported by a sleeve bearing pressed and fixed in an output side shield 30, and the output side yoke 32 and permanent magnet 33. Then, a ventilating chamber 12c is set by separating a motor section from a magnetic coupling section with a dust-proof plate 14, and is served for the entrance proofing of foreign matters or the like and for the guide of cooling air, and is communicated with external sections through a ventilating slot 12b set to the motor 10 side closer than to the dust-proof plate 14 on the outer peripheral surface of the motor shield 12, and through a ventilating slot 12a set on the axis-directional surface of the shield 12. Then, cooling air can be made to flow by a fan 13 driven with the motor shaft 11.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical field to which the invention pertains] The present invention relates to a cooling structure for an electric motor that takes into account dust prevention of a magnetic coupling part of an electric motor with a magnetic coupling.

[Prior art and its problems]

The reason why a motor with a magnetic coupling is required is to thermally and airtightly isolate the motor from the high-temperature, high-pressure air on the load side, but there is a concern that magnetic couplings may magnetically attract magnetic dust and cause trouble. Because of this, it was normal for the coupling part to have a sealed structure. However, there is a risk of burnout of the motor bearings and motor windings due to heat transfer from the high-temperature load side, so the motor section must be moved away from the coupling section, resulting in a larger device. I didn't get it.

[Purpose of the invention]

The object of the present invention is to provide a small and inexpensive electric motor with magnetic coupling.

[Key points of the invention]

In order to achieve the above object, the present invention provides an electric motor with a magnetic coupling, characterized in that a ventilation chamber in the electric motor is connected to the outside through a ventilation hole, and a fan driven by a motor shaft is provided in the ventilation chamber. Configure.

[Embodiments of the invention]

FIG. 1 shows an embodiment of the present invention, in which a drive-side yoke 15 made of a magnetic material is fixed on a motor shaft 11 outside a shield 12 of a motor 10. As shown in FIG. A permanent magnet 16 magnetized in the axial direction is adhesively fixed to the axial surface of the driving side yoke 15. A record plate-shaped dustproof plate 14 having a shaft hole slightly larger than the outer circumferential diameter of the protruding portion on the outer periphery of a sleeve-shaped protruding portion along the wL motor shaft 11 from the drive side yoke 15 toward the motor side is attached to the motor shield 12. It is screwed on. Furthermore, a press-molded metal fan is press-fitted into the tip of the sleeve protrusion. A partition plate 20 made of a plate of non-magnetic material is pressed and fixed from both sides in a sandwiched manner between an output side shield 30 and a motor shield 12. A sleeve bearing 34 is press-fitted and fixed to the output side shield 30, and the output shaft 31 is supported concentrically with the motor shaft 11 by the sleeve bearing.

An output side yoke 32 is fixed on one end of the output shaft 31,
A permanent magnet 38 is adhesively fixed to the output side yoke 32 and faces the drive side yoke 15 and the permanent magnet 16 with the partition plate 20 in between. In such a configuration, the motor shaft 1
When the drive side yoke 15 and permanent magnet 16 are driven by 1, electricity is generated by the magnetic force between the permanent magnet 16 and the permanent magnet 33, which are arranged facing each other. The power of the iJ machine is transmitted to the output shaft 31 via the output side yoke 32.

This device is for stirring a high temperature and high pressure constant temperature bath, and is mounted on the bath wall so that only the output shaft protrudes into the bath. communicated. Therefore, due to heat transfer, the x-motor bearing 17 and the motor windings become hot, and there is a risk of burnout. As a countermeasure, the partition plate 20, the electric motor 10, and the electric motor bearing 1
It is possible to flow cooling air into the space of 7, but permanent magnet 1
There was a concern that the magnetic force of 6°83 would attract magnetic dust and cause problems. In the present invention, a ventilation chamber 120 is provided by separating the electric motor section and the magnetic coupling section with a dustproof plate 14,
A ventilation hole is constructed to prevent deafening dust and foreign objects from entering the magnetic coupling portion, and also serves as a guide for cooling air, and is located closer to the motor than the dustproof plate 14 on the outer circumferential surface of the motor shield 12. 12b and a ventilation hole 12a provided on the axial surface of the shield 12 to communicate with the outside, and a fan 13 driven by the motor shaft 11 causes cooling air to flow. Note that FIG. 2 is a perspective view of the motor shield 12 in FIG.
As shown in the figure, the ventilation holes on the axial end face are arranged above the bearing plane, and the ventilation holes on the outer peripheral surface are arranged below the horizontal plane.

〔Effect of the invention〕

According to this invention, the dustproof plate is provided between the electric motor part and the magnetic coupling, and the dustproof plate is provided through the ventilation hole provided on the axial end face of the motor shield and the dustproof plate via the space surrounded by the dustproof plate and the motor shield. By allowing cooling air to flow between the shield and the ventilation holes provided on the outer circumferential surface of the shield on the motor side, it is possible to cool the magnetic coupling part of the motor without foreign matter entering the magnetic coupling. The effect of making the device smaller and cheaper can be obtained.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a main part according to an embodiment of the present invention, and FIG. 2 is a perspective view of the motor shield 12 of FIG. 1. 13...Fan, 14...Dustproof plate, 15...Drive side yoke, 32...Output side yoke, 12EL, 12b
...Ventilation hole, 120...Ventilation room.

Claims (1)

[Claims] 1) In a motor equipped with a magnetic coupling at one end in the axial direction of the motor shield, the motor side of the magnetic coupling is covered with a dustproof plate, and a ventilation chamber surrounded by the dustproof plate and the shield is exposed to the outside through a ventilation hole. An electric motor with a magnetic coupling, characterized in that a fan driven by a motor shaft is provided in the ventilation chamber.