JPS6156703B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an axially ventilated rotating electric machine, and particularly to the structure of a ventilation fan.

Conventional axial ventilation type rotating electric machines have structures shown in FIGS. 1 and 2. What is shown in FIG. 1 is a rotating electrical machine in which a fan F and a fan electric motor M are mounted near the end of the upper surface of a rotating electrical machine main body C, and both ends of a rotating shaft S protrude from the main body C.

In the one shown in FIG. 2, a fan F and a fan electric motor M are mounted on one end of a rotating electrical machine main body C so as to be concentric with the rotating shaft S of the electrical machine. One end of the rotating shaft is closed by a fan and a fan electric motor, so that it cannot protrude to the outside.

In both of FIGS. 1 and 2, outside air or cooled air is sucked in from an intake hole (not shown) by a fan F, and flows through a flow path in the stator K and the stator as shown by arrow a. The air is vented through the air gap between the rotor and the rotor, and is exhausted through an exhaust hole (not shown) to remove heat generated by rotor operation. The figure is a conceptual diagram of ventilation directions including fully closed type and open type.

Conventional rotating electric machines are constructed as described above, and the structure shown in FIG. 1 has the drawbacks that the ventilation path is long and has many bends, resulting in high ventilation resistance and a complicated structure, making it not compact. The structure shown in FIG. 2 has the disadvantage that one shaft end cannot be used for loading purposes.

This invention was made in order to eliminate the above-mentioned drawbacks of the conventional machine, and its purpose is to provide a rotating electrical machine that has as little ventilation resistance as possible in terms of axial ventilation, and that allows both shaft ends to be used for loading. A rotor having a center hole of the ventilation fan motor located at the end of the shaft, a stator of the ventilation fan motor surrounding the outside of this rotor, and a rotor that passes through the center hole of the rotor and of the rotating electrical machine body. A rotating electrical machine is provided that includes a rotating shaft of the rotating electrical machine whose shaft end protrudes to the outside of a ventilation fan motor side.

The invention will be described with reference to an embodiment illustrated below.

As shown in FIG. 3, the rotating electrical machine according to the present invention is located at the end of the rotating shaft of the rotating electrical machine main body, and has a fan 1.
The rotor 2 is characterized by having a hollow structure having a central hole 3. A rotating shaft 4 of a rotating electric machine passes through a center hole 3 of the rotor 2, and the rotor 2 is rotatably mounted thereon via a bearing 5. Therefore, the rotor 2 is supported concentrically with the rotating shaft 4 of the rotating electrical machine, and a gap is maintained between it and the stator 8 of the fan motor, which is supported by the stator support 7 fixed to the bracket 6 of the rotating electrical machine main body. sell.

The rotating shaft 4 of the rotating electrical machine supports the fan motor rotor as described above, and at the same time, the rotary shaft 4 of the rotating electric machine supports the rotor of the fan motor as described above.
The shaft end 4a thereof also passes through the cover 9 on the side of the ventilation fan motor of the rotary electric machine body and extends to the outside of the body. In the figure, cover 9 shows a cover for a completely closed external fan, and cover 9' shows a cover for an open case.

In the embodiment shown in Fig. 3, the stator surface is parallel to the rotating shaft plane, but if the angle between the two is not 0°, a motor with a conical core or a flat motor may be used. .

As described above, according to the present invention, the shaft end of the rotating shaft protrudes to the outside, and axial ventilation can be performed with relatively low ventilation resistance, so that a lightweight rotating electrical machine with high heat removal efficiency can be achieved. can get.

Further, since the shaft ends of the ventilation fan motor side are exposed to the outside, there is an advantage that both shaft ends can be used for load purposes. Furthermore, since the rotor of the ventilation fan motor is located inside the stator and the centrifugal force is small, the structure can be simple in terms of strength.Moreover, the inertial force is small, so it has the effect of good starting and stopping response. Since the rotor is supported by the motor shaft in a well-balanced manner, the rotor is stable in terms of strength and has the effect of being less likely to generate vibrations.

[Brief explanation of the drawing]

Figure 1 is a side view schematically showing a typical structure of a conventional rotating electrical machine with a ventilation fan motor on the main body and both shaft ends protruding, and Figure 2 is a conventional rotating electrical machine with an end at the center of the shaft. FIG. 3 is a side view schematically showing a typical structure in which a ventilation fan motor is located, and FIG. 3 is a partial sectional view showing the end of a rotating shaft of an embodiment of a rotating electric machine according to the present invention. 1...Fan, 2...Rotor, 3...Center hole,
4...Rotating shaft, 4a...Shaft end, 5...Bearing, 6...
...Bracket, 7...Stator support, 8...Stator, 9,9'...Cover, C...Main body, F...Fan, K...Stator, M...Fan motor, R...
...rotor, S...rotation shaft.

Claims (1)

[Claims] 1. In an axially ventilated rotating electrical machine, a rotor shaft of the rotating electrical machine is arranged such that the shaft end protrudes to the outside, and a rotor shaft located at the shaft end of the rotor shaft of the rotating electrical machine is arranged such that the shaft end projects outside. The rotor of the ventilation fan motor is arranged concentrically, and the rotor shaft and the rotor of the ventilation fan motor are connected at a position where the rotor shaft and the rotor of the ventilation fan motor face each other. 1. A rotating electrical machine comprising: a bearing inserted between the ventilation fan motor; and a stator of the ventilation fan motor arranged to surround the outer periphery of the rotor of the ventilation fan motor.