JPH05227685A - Electric rotating machine - Google Patents

Abstract

PURPOSE:To provide an electric rotating machine equipped with a fan rotatable together with a rotor to cool the rotor and the stator wherein manufacturing cost is reduced by reducing manpower required in manufacturing process. CONSTITUTION:A plurality of recesses 2 are embossed in zigzag in a tubular stainless steel plate which is then pressed into a frame 1. A stator core 4 is supported, at the outer periphery thereof, by a protruding part on the inner peripheral side of the recess 2 thus providing a gap for feeding cooling air between the outer frame 1 of stator and the stator 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary electric machine using a steel plate frame.

[0002]

2. Description of the Related Art In a self-cooling type rotary electric machine, a rotor and a stator are generally cooled by a fan mounted on a rotary shaft. In this case, the fan sucks the outside air into the machine to remove the heat of the rotor and the stator and discharge the heat to the outside of the machine. Further, in this type of drip-proof protection type electric rotating machine, no heat dissipation fins are provided in the stator outer frame, and a gap is provided between the stator outer frame and the stator iron core in order to cool the stator iron core efficiently. A consideration is given so that a part of the cooling air from the fan is divided into the gap.

[0003]

In the conventional rotary electric machine described above, the outer frame of the stator is made of cast metal, and the inner ribs are formed by machining to secure the above-mentioned gap. Are machined to be supported by inner ribs. In this case, there is a problem that processing accuracy is required, the number of work steps is increased, and the cost is increased. The present invention has been made in view of the above problems, and an object of the present invention is to provide a low-priced general-purpose rotary electric machine that reduces the number of work steps.

[0004]

[Means for Solving the Problems] To achieve the above object,
The present invention relates to a rotary electric machine that includes a fan that rotates together with a rotor, and cools the rotor and the stator with cooling air from the fan. A frame obtained by press-working a plurality of dents by embossing on a cylindrical steel plate in a zigzag pattern. Using
The outer circumference of the stator core is supported by the projections on the inner circumference side formed by the recesses, and a gap through which cooling air flows is provided between the outer frame of the stator and the stator.

[0005]

By using the frame, the assembly is facilitated, the number of man-hours in the manufacturing process is reduced, and turbulent flow is generated in the cooling air flowing through the gap due to the zigzag-shaped recesses to improve the heat transfer function. However, the stator core and the stator outer frame are efficiently cooled.

[0006]

FIG. 1 shows an embodiment of the rotating electric machine of the present invention. FIG. 1A is a perspective view showing the external appearance of the rotating electric machine of this embodiment, and FIG. 1B is a half cross-sectional view seen from the side.

The stator outer frame 1 is made of a steel plate or the like as shown in FIG.
As shown in (a), it functions as a cylindrical frame in which a plurality of recesses 2 are provided in a zigzag pattern by embossing by a press, and brackets 13 and 14 are fitted from both sides and fixed integrally. The mounting leg 15 is fixed to the stator outer frame 1 by welding. As shown in FIG. 1B, the plurality of recesses 2 provided in the stator outer frame 1 project toward the inner peripheral side and come into contact with the outer periphery of the stator core 4 to support the stator core 4. The portion of the stator outer frame 1 to which the mounting legs 15 are welded is shown in FIG.
As shown in FIG. 5, linear recesses 16 and 17 are provided according to the axial length of the mounting leg 15 and are fixed by laser welding together with the stator core 4.

The stator outer frame 1 is machined into a cylindrical shape in advance as it is in the form of a plate, and the embossing of the plurality of recesses 2 and the pressing of the linear recesses 16 and 17 are carried out from the circumferential direction. Can be pressed into. By this press working, the gap 7 between the stator outer frame 1 and the stator core 4 is accurately provided. The central portion 3 of the embossed recess 2 can be fixed to the stator core 4 by laser welding as appropriate.

When the rotor 5 rotates, an air flow is generated by the action of the fan 6 mounted on the rotor 5 as shown in FIG.
As shown in, cooling air flows from the anti-load side toward the load side. A part of the cold pole wind flows through the gap 7 between the stator outer frame 1 and the stator core 4 by the action of the baffle plate 9 as shown by an arrow,
The stator core 4 is cooled. In this case, since the plurality of recesses 2 formed by embossing are arranged in a zigzag manner, the cooling air flows over the entire surface of the stator core 4 due to the turbulent effect, and the heat transfer action is improved to fix the stator core 4 to the stator core 4. The child outer frame 1 is efficiently cooled. The stator outer frame 1, the stator core 4 and the mounting legs 15 are
By joining by laser welding, the amount of thermal deformation of the stator outer frame 1 and the stator iron core 4 caused by welding is small, and it can be easily assembled even in the process of assembling the rotating electric machine, and the number of work steps can be reduced. Becomes

[0010]

According to the present invention, it is possible to provide a rotating electric machine having a reduced number of man-hours in the manufacturing process of the rotating electric machine, which is inexpensive and economically improved, and which has improved cooling characteristics and which is highly reliable.

[Brief description of drawings]

FIG. 1 is a perspective view and a cross-sectional view of an embodiment of a rotating electric machine of the present invention,

FIG. 2 is an axial sectional view of the above embodiment.

[Explanation of symbols]

 1 ... Stator outer frame 2 ... Embossed recess 3 ... Laser weld 4 ... Stator core 5 ... Rotor 6 ... Fan 7 ... Gap 8 ... Armature coil 9 ... Baffle plate 10 ... Rotating shafts 11, 12 ... Bearing 13,14… Bracket 15… Mounting leg 16,17… Recessed by pressing

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shinichi Noda 2121 Nobu, Asahi-cho, Mie-gun, Mie Pref., Mie Plant, Toshiba Corporation (72) Takeo Kakiuchi 2121 Sayo-cho, Asahi, Mie-gun, Mie Stock company Toshiba Mie factory

Claims (1)

[Claims] 1. A rotary electric machine comprising a fan that rotates together with a rotor, wherein a rotor and a stator are cooled by cooling air from the fan. A cylindrical steel plate is embossed with a plurality of depressions in a zigzag pattern. A rotating electric machine characterized in that a frame is used to support the outer circumference of a stator core by a projection on the inner circumference side due to the recess, and a gap through which cooling air flows is provided between the stator outer frame and the stator.