JPS58170344A - Tandem type rotary electric machine - Google Patents

Abstract

PURPOSE:To enhance cooling performance of a tandem type revolving electric machine by a method wherein a fan having the outside diameter larger than the inside diameter of a stator is assembled at the middle part of the shaft of the tandem type rotary electric machine. CONSTITUTION:A fan boss 10 having the outside diameter smaller than the inside diameter of the stator 5 is engaged with the middle part between the rotors 2, 3 of a shaft 1. the fan 11 having the inside diameter in the condition previously deposited between the stators 4, 5 larger than the outside diameter of the rotor 2, and having the outside diameter larger than the inside diameter of the stator 5 is fixed to the boss 10 thereof. The outside circumference of the fan boss 10 and the inside circumference of the equipping hole of the fan 11 are processed together to have the taper shape in the axial direction, the taper parts thereof are fitted mutually, a bolt is screwed in the radial direction from a ventilating port 9 into seats provided corresponding mutually, and both are united.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a ventilation structure for a tandem rotating electrical machine. Two rotors are attached to one shaft like a motor generator,
A tandem rotating electric machine, in which two stators corresponding to these rotors are mounted on a common frame, must have a simple structure as possible, and the inside must be cooled uniformly and sufficiently by ventilation. Delicious.

FIG. 1 is a schematic longitudinal sectional view of a conventional tandem rotating electric machine. In the figure, 1 is a shaft, and two rotors 2.8 are attached to this shaft.
are attached, and stators corresponding to these rotors; 4.
5 are attached to a common frame 6. A fan boss 7 is fitted between the rotors 2 and 3 of the shaft 1.
A fan 8 is attached to the. The fan 8 cools the interior by sucking in air from both sides as shown by arrows and exhausting it through an exhaust port 9 provided in the center of the stator frame.

With this structure, the fan can be assembled into the stator while being attached to the rotor, so the outer diameter of the fan 8 must be smaller than the inner diameter of the stator 5, which has a larger inner diameter. Due to performance constraints, it was difficult to cool the inside sufficiently, resulting in a large rotating machine.

An object of the present invention is to eliminate the above-mentioned drawbacks, and to provide a tandem rotating electrical machine that can be made into a compact light machine with improved cooling performance by making it possible to incorporate a fan whose outer diameter is larger than the inner diameter of the stator. do.

Next, embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is a schematic vertical sectional view of a tandem rotating electric machine according to an embodiment of the present invention, and FIG. 8 is an enlarged sectional view of a cooling fan thereof. Components designated by the same reference numerals as in FIG. 1 are the same parts. axis 1
A fan boss 10 whose outer diameter is smaller than the inner diameter of the stator 5 is fitted in the intermediate part between the rotors 2 and 8.
A fan 11 is installed in advance between the stators 4 and 5, and the inner diameter thereof is larger than the outer diameter of the rotor 2, and the outer diameter is larger than the inner diameter of the stator 5. The outer periphery of the fan boss 10,
To install the fan 11, the inner periphery of the hole is tapered in the axial direction, and by fitting this tapered part, the bolt 12 is inserted into the seat 101, 111 provided correspondingly to the vent hole 9.
The two are connected by screwing in the radial direction.

The fitting between the fan boss 10 and the fan 11 may be a flange fitting instead of a tapered fitting. In that case, when assembling the rotor into the stator and joining the fan 11 to the fan boss 10, it is difficult to perform the joining work while visually checking the joining part, but if a tapered part is provided, the joining becomes easy. . In addition, if the exhaust port 9 in the center of the stator is made large enough to allow the fan 11 to be inserted from above, once it is connected to the rotor and balanced, the fan is removed and inserted through the exhaust port 9 to be assembled. It can now be connected to the rotor.

According to the present invention, a fan whose outer diameter is larger than the stator inner diameter can be easily attached to and removed from the center of the shaft of a tandem rotating electric machine, and the ventilation performance of the fan is improved, making the rotating electric machine smaller and lighter and more reliable. It has the effect of improving sexual performance.

[Brief explanation of drawings]

FIG. 1 is a schematic vertical cross-sectional view of a conventional tandem-type rotating electric machine, FIG. 2 is a schematic vertical cross-sectional view of a tandem-type rotating electric machine according to an embodiment of the present invention, and FIG. 8 is an enlarged cross-sectional view of its cooling fan. 1... Shaft, 2.8... Rotor, 4.5... Stator, 6... Frame, 7... Fan boss, 8... Fan,
9...Exhaust port, lO...Fan boss, 11...Fan, 12...Volt. Agent “IZJXJJ”

Claims (1)

[Claims] In a rotating electric machine in which two rotors are attached to one shaft and two stators corresponding to these rotors are attached to a common frame, a device that fits between the two rotors of the shaft. Insert a fan whose outer diameter is larger than the inner diameter of the stator into the fan boss, which has been placed between the two stators in advance, into the inner circumference of the hole, and connect these fans and the fan boss. A tandem rotating electric machine characterized by being connected by screwing bolts in the radial direction from a ventilation hole provided in the center of a stator frame.