JP2006149042A - Cooling apparatus of rotary electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cooling apparatus of a rotary electric machine having an inexpensive frame cover with good workability and vibration resistance. <P>SOLUTION: The cooling apparatus of the rotary electric machine has a stator core 1 onto which a coil is wound, a frame 2 having an inner circumference fitted to the stator core 1, a cooling fan 3 provided on an outer circumference of the frame 2, and the frame cover 4 disposed and forming a ventilation path between the frame 2. The frame cover 4 comprises a tape wrapped at the end of the cooling fan 3 on the frame 2. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a cooling device for a rotating electrical machine having a frame with cooling fins.

Conventionally, a cooling device for a rotating electrical machine having a frame with a cooling fin has provided a cover on the upper portion of the cooling fin to form a ventilation path for cooling air (for example, Patent Document 1).
3 and 4 are a partial side sectional view and a partial front sectional view showing a main part of a cooling device for a rotating electrical machine in the prior art.
3 and 4, 1 is a stator core, 2 is a frame, 3 is a fin provided on the frame, 5 is a frame cover, and 6 is a fastening screw.
The frame cover 5 is made of an iron plate, and in order to secure an air passage between the frame 2 and the frame cover 5, the shape is bent in a complicated manner, and a plurality of parts are welded to form. The molded frame cover 5 is fixed with a plurality of screws 6.
JP-A-11-299174 (FIG. 1)

However, such conventional techniques have the following problems.
(1) Since the frame cover is made of a thin iron plate, the eigenvalue is likely to resonate with vibration generated from the electric motor. In order to prevent resonance, it is necessary to attach a large number of screws or vibration-proof rubber, so that the workability is deteriorated and the number of parts is increased and the reliability is deteriorated.
(2) The production of the frame cover also requires a work process such as bending the iron plate in a complicated manner and performing welding, which increases man-hours and costs.
(3) Furthermore, it is difficult to eliminate the gap between the frame cover and the top of the fin in terms of component accuracy, and a part of the cooling air escapes from the gap without hitting the fin, resulting in poor cooling efficiency.
The present invention has been made to solve such problems, and an object of the present invention is to provide a cooling device for a rotating electrical machine having a frame cover that is inexpensive, has good workability, and has good vibration resistance.

In order to solve the above problem, the present invention provides a stator core between which a coil is wound, a frame in which the stator core is fitted to an inner peripheral surface, cooling fins provided on the outer peripheral surface of the frame, and the frame. In the cooling device for a rotating electrical machine having a frame cover arranged so as to form a ventilation path, the frame cover is constituted by a tape wound around the tip end portion of the cooling fin of the frame.
The tape is made of a material having good thermal conductivity.

The present invention has the following effects.
(1) Since the frame cover is composed of a tape wound around the tip of the cooling fin, the eigenvalue can be greatly reduced, and resonance with the rotational frequency of the motor can be prevented.
(2) There is no need to use screws, and workability is improved.
(3) The number of parts can be reduced, reliability can be improved, and cost can be reduced. Further, since the tape constituting the frame cover is a purchased product, it is very easy to obtain and inexpensive, and further cost reduction is possible.
(4) The clearance between the cooling fin and the frame cover can be eliminated, and the cooling efficiency is improved.

  Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a side sectional view showing a ventilation path for cooling air of a rotating electrical machine, for example, an electric motor, in an embodiment of the present invention. FIG. 2 is a partial front sectional view of FIG.
1 and 2, reference numeral 1 is a stator core wound with a coil, 2 is a frame in which the stator core 1 is fitted to the inner peripheral surface, 3 is a cooling fin provided on the outer peripheral surface of the frame 2, and 4 is a cooling fin. It is the frame cover comprised with the tape wound around the front-end | tip part. The tape constituting the frame cover 4 is wound around the front end of the cooling fin 3 without any gaps around the circumference. When the steel plate frame cover is tightened with a screw as in the prior art, it tends to have an eigenvalue close to the rotational frequency of the motor and there is a possibility of resonance. However, since the rigidity of the frame cover 4 formed by winding the tape is low, It becomes an eigenvalue of the frequency, and the possibility of resonating with the rotational frequency of the electric motor can be suppressed. Further, since no screws are used, workability is improved, and reliability can be improved by reducing the number of parts. Also, since the tape follows the tip of the cooling fin, it is easy to eliminate the gap between the tape and the tip of the cooling fin, so that part of the cooling air does not hit the cooling fin and does not escape from the gap. Efficiency is improved. In this case, if the tape is made of a material having good thermal conductivity, the cooling efficiency is further improved.
In terms of cost, the material is only a tape, and since the tape is a purchased product, it is very easy to obtain and inexpensive, and it is possible to greatly reduce the cost together with improvement in workability.

It is a sectional side view which shows the ventilation path of the cooling air of the rotary electric machine in the Example of this invention, for example, an electric motor. It is a partial front sectional view in FIG. It is a fragmentary sectional side view which shows the principal part of the cooling device of the rotary electric machine in a prior art. It is a partial front sectional view in FIG.

Explanation of symbols

1 Stator Core 2 Frame 3 Cooling Fin 4 Tape Frame Cover 5 Iron Frame Cover 6 Screw

Claims (2)

A stator core around which a coil is wound, a frame in which the stator core is fitted to an inner peripheral surface, cooling fins provided on the outer peripheral surface of the frame, and an air passage are formed between the frames. In a cooling device for a rotating electric machine having a frame cover,
The cooling device for a rotating electric machine, wherein the frame cover is formed of a tape wound around a tip end portion of a cooling fin of the frame.   The cooling device for a rotating electric machine according to claim 1, wherein the tape is made of a material having good thermal conductivity.

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