JP2006254639A - Rotary electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a separately-ventilated rotary electric machine having an inexpensive and compact structure, combining a brake and a rotation detector, and eliminating a problem on a shortage of a cooling capability even if the rotating electric machine is used at a low speed. <P>SOLUTION: In the rotary electric machine having a cooling apparatus separately ventilated by a cooling fan, a hollow shaft for supporting a stator of a cooling electric motor is fixed to a bracket opposite to a load in the rotary electric machine, the cooling fan is attached to a rotor of the cooling electric motor supported by the hollow shaft through a bearing, and an output shaft of a body of the rotary electric machine penetrates the hollow shaft. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a technique for providing a rotating electrical machine.

  Self-ventilated motors usually cool each part of the body with a cooling fan installed on the drive shaft. However, in motors used mainly at variable speeds, self-ventilated motors are insufficiently cooled at low speeds, so other-powered ventilated motors are used. In many cases, this structure is used (see, for example, Patent Document 1). On the other hand, when the electric motor is used in combination with options such as a brake and a rotation detector, such an optional device is mainly installed on the shaft on the anti-load side.

Conventionally, in a self-ventilated electric motor, the anti-load side shaft protrudes and the optional device is attached to the rotating shaft. However, when this motor is used at a variable speed, there are problems such as insufficient cooling at low speed as described above. Arise. In the case of the other-force ventilation type, the cooling device is usually installed on the extension line of the anti-load side shaft, so it is difficult to respond to options, or the cooling device is placed on the top of the motor with a special frame to cool it, or the motor A structure in which a ventilation path is formed in the upper part and cooling air is sent to the ventilation path of the motor body is necessary.
JP-A-10-31554

  In the above prior art, if a motor is used in combination with an option such as a brake or a rotation detector, and a problem such as insufficient cooling does not occur even if it is used at a variable speed, it is recommended to install an external power ventilation device. The special frame structure must be used, resulting in a great cost, and there is a drawback that the physique of the motor becomes large in order to secure the ventilation path of the cooling device.

  Therefore, according to the present invention, in a rotating electric machine equipped with a separate-force ventilation type cooling device, it is possible to install an option on the extension line of the anti-load side shaft without using a special frame, and obtain a sufficient amount of cooling air. Another object of the present invention is to provide an other-ventilated rotary electric machine that is inexpensive and has a compact structure.

  In order to solve the above-described problems, the present invention provides a rotating electrical machine having an external power cooling device, wherein the cooling fan part constituting the external power cooling device has a hollow structure, and the shaft of the motor body is a hollow part of the cooling fan. To penetrate. Further, according to the present invention, in the rotating electrical machine having the other-force ventilation cooling device, the other-force ventilation cooling device is constituted by a cooling fan having a hollow drive source and a hollow shaft, and the shaft of the electric motor body penetrates the cooling fan. did.

  Further, according to the present invention, in the rotating electrical machine having the other-force ventilation cooling device, the drive source of the other-force ventilation cooling device is installed on a shaft different from the rotating electrical machine main body shaft, and the cooling fan is driven by a rotation transmission device such as a belt. I did it. Further, according to the present invention, in the rotating electrical machine having the other-force ventilation cooling device, the cooling fan is supported by a bearing or the like installed on the rotating electrical machine main body shaft.

  That is, the present invention relates to a rotating electrical machine having a cooling fan and other force ventilation cooling device, in which a hollow shaft that supports a stator of a cooling motor is fixed to an anti-load side bracket of the rotating electrical machine, and a bearing is attached to the hollow shaft via a bearing. A cooling fan was attached to the rotor of the cooling motor supported in this manner so that the output shaft of the rotating electrical machine main body penetrated the hollow shaft. Further, according to the present invention, in the above rotating electric machine, the ventilation cooling device includes a cooling fan having a hollow drive source and a hollow shaft.

  According to the present invention, in a rotating electrical machine having an external power cooling device using a cooling fan, a cooling motor is provided on a shaft different from the output shaft of the rotating electrical machine body, and a first pulley is provided on the output shaft of the cooling motor. The hollow shaft supporting the cooling fan via the bearing is fixed to the anti-load side bracket of the rotating electric machine, the cooling fan is attached to the second pulley supported via the bearing on the hollow shaft, and the second pulley Is driven by the first pulley via a rotation transmission means so that the rotating electric machine main body output shaft penetrates the hollow shaft.

  Furthermore, the present invention provides a rotating electric machine having a cooling fan with other force ventilation, wherein a cooling electric motor is provided on a shaft different from the rotating electric machine main body output shaft, and a first pulley is provided on the output shaft of the cooling electric motor. The hollow shaft is fixed to the rotary electric machine output shaft, a cooling fan is attached to the second pulley supported on the hollow shaft via a bearing, and the second pulley is connected to the first pulley via the rotation transmission means. The rotating electric machine main body output shaft penetrates the hollow shaft.

  According to the present invention, the electric motor main body frame does not have a special structure, and the cooling device shares the ventilation path with the electric motor main body, so the electric motor physique is almost the same as the self-ventilated type. Rotating with an inexpensive and compact structure that uses a motor in combination with options such as a brake and rotation detector, and can obtain sufficient cooling airflow even when used at a variable speed, without causing problems such as insufficient cooling. An electric machine can be provided.

  An embodiment of the present invention will be described with reference to FIG. FIG. 1 shows a rotary electric machine having an external ventilation cooling device according to the present invention in which a cooling fan portion constituting the external power ventilation cooling device has a hollow structure so that the shaft of the motor body penetrates the hollow portion of the cooling fan. It is a figure explaining the structure by which the structure and the other power ventilation cooling apparatus are comprised with the cooling fan which has a hollow drive source and a hollow shaft, and the axis | shaft of an electric motor main body penetrates a cooling fan.

  The rotating electrical machine includes a rotating electrical machine main body 1, an anti-load side bracket 2, a rotating electrical machine body output shaft 3, and an external force ventilation cooling device 6 fixed to the anti-load side bracket 2. The other-force ventilation cooling device 6 includes a cooling motor 4 and a cooling fan 59 attached to the rotor 44 of the cooling motor 4, and the cooling motor 4 is fixed to the anti-load side bracket 2. A stator 43 provided outside the hollow shaft 41 and a rotor 44 attached to the hollow shaft 41 via a bearing 42 are configured. The cooling fan 59 is attached to the rotor 44. The cooling motor (hollow cooling device drive source) 4 is fixed to the anti-load side bracket 2 of the electric motor body 1, drives the hollow other-force ventilation cooling device 6, and cools the electric motor body 1 by ventilation. The rotating electrical machine main body output shaft 3 passes through the hollow shaft 41 of the other-force ventilation cooling device 6 and protrudes to the non-load side, so that optional devices such as a brake and a rotation detector can be attached.

  According to this embodiment, as with a self-ventilated motor, the anti-load side shaft can be used for an optional device such as a brake or a rotation detector, and the motor physique is almost the same as the self-ventilated motor, so it is inexpensive and compact. Other power ventilation type rotating electrical machines can be provided. Furthermore, since the hollow shaft can be provided in the vicinity of the rotating electric machine body output shaft, the diameter can be reduced, and the distance between the inner diameter and the outer diameter of the cooling fan can be sufficiently increased, so that the thickness is thin. A sufficient amount of cooling air can be obtained with the cooling fan, and the entire rotating electrical machine can be made compact.

  A second embodiment of the present invention will be described with reference to FIG. In the first embodiment, the cooling motor 4 is provided on the outside of the hollow shaft 41 as the driving source. However, in this embodiment, the cooling driving motor 4 is fixed to the outside of the electric motor body 1 and to the upper part. The other-force ventilation cooling device 6 is driven via the belt 70. That is, as shown in FIG. 2, the cooling motor 4 is fixed to the outside and the upper part of the motor body 1. That is, the cooling motor 4 is installed on a shaft different from the rotating electrical machine main body output shaft 3, and the first pulley 71 and the belt 70 fixed to the output shaft of the cooling motor 4 and the hollow shaft fixed to the anti-load side bracket 2. A cooling fan 59 is rotationally driven by a second pulley 72 attached to 41 via a bearing 42. A cooling fan 59 is attached to the second pulley 72. The rotary electric machine main body output shaft 3 passes through the hollow shaft 41.

  A third embodiment of the present invention will be described with reference to FIG. In this embodiment, the hollow shaft 41 in the second embodiment is supported on the rotating electrical machine main body output shaft 3 as a bearing inner ring 421 constituting the bearing 42 and is rotatably supported on the bearing inner ring 421 by a ball 422. The second pulley 72 is fixed to the bearing outer ring 423 of the bearing 42.

  Also in the second and third embodiments, as with the self-ventilated motor, the anti-load side shaft can be used for optional devices such as a brake and a rotation detector, and the motor physique is almost the same as the self-ventilated motor, so it is inexpensive. It is possible to provide an other-forced rotating electric machine with a compact structure. Note that the safety can be enhanced by protecting the belt and pulley portions of the power transmission means of FIGS. 2 and 3 with a safety cover.

BRIEF DESCRIPTION OF THE DRAWINGS The cross-sectional view explaining the structure of the rotary electric machine which made the drive source concerning the 1st Embodiment of this invention hollow. BRIEF DESCRIPTION OF THE DRAWINGS The cross-sectional view explaining the structure of the rotary electric machine which made the drive source concerning the 1st Embodiment of this invention hollow. BRIEF DESCRIPTION OF THE DRAWINGS The cross-sectional view explaining the structure of the rotary electric machine which made the drive source concerning the 1st Embodiment of this invention hollow.

Explanation of symbols

1: Motor body 2: Anti-load side bracket 3: Rotating electric machine body output shaft 4: Cooling motor 41: Hollow shaft 42: Bearing 421: Bearing inner ring 422: Ball 423: Bearing outer ring 43: Stator 44: Rotor 59: Cooling fan 6: Other power ventilation cooling device 70: Belt 71: First pulley 72: Second pulley

Claims (4)

In a rotating electrical machine having an external cooling device with a cooling fan,
Fix the hollow shaft that supports the stator of the cooling motor to the anti-load side bracket of the rotating electrical machine,
A cooling fan is attached to the rotor of the cooling motor supported by the hollow shaft via a bearing,
A rotary electric machine characterized in that a rotary electric machine main body output shaft passes through the hollow shaft.   The rotating electrical machine according to claim 1, wherein the ventilation cooling device includes a cooling fan having a hollow drive source and a hollow shaft. In a rotating electrical machine having an external cooling device with a cooling fan,
A motor for cooling is provided on a shaft different from the output shaft of the rotating electrical machine body,
A first pulley is provided on the output shaft of the cooling motor;
Fix the hollow shaft that supports the cooling fan via the bearing to the anti-load side bracket of the rotating electrical machine,
A cooling fan is attached to the second pulley supported by the hollow shaft via a bearing,
Driving the second pulley with the first pulley via the rotation transmission means;
A rotary electric machine characterized in that a rotary electric machine main body output shaft passes through the hollow shaft. In a rotating electrical machine having an external cooling device with a cooling fan,
A motor for cooling is provided on a shaft different from the output shaft of the rotating electrical machine body,
A first pulley is provided on the output shaft of the cooling motor;
Fix the hollow shaft to the rotating electrical machine output shaft,
A cooling fan is attached to the second pulley supported by the hollow shaft via a bearing,
Driving the second pulley with the first pulley via the rotation transmission means;
A rotary electric machine characterized in that a rotary electric machine main body output shaft passes through the hollow shaft.

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