JP2011047285A - Hermetic compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an efficient hermetic compressor by reducing a magnetic loss of the core inside by restraining strain of a stator core. <P>SOLUTION: A stator 1 of integrally fixing an end plate 13 having an outer diameter larger by 50-100 &mu;m than an outer diameter of the stator 1 by caulking, is inserted into a body shell 6 by tight fit, and stress from the body shell 6 is received by the end plate, and a loss of a motor is restrained by minimizing the strain of the stator core 12. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a hermetic compressor used for an air conditioner / cooler.

  In general, a stator of a brushless motor used in a conventional hermetic compressor is fixed by shrinkage to a barrel shell constituting a pressure vessel of the compressor. However, in this configuration, the stress due to shrinkage is all received by the stator core (see, for example, Patent Document 1).

JP-A-11-006480

  In the conventional configuration, the core shell constituting the pressure vessel of the compressor is fixed by shrinkage. Therefore, in order to maintain the pull-out strength of the stator, a large stress is applied to the core and the core is distorted. The efficiency of the motor deteriorated due to the increase.

  An object of the present invention is to solve such a conventional problem, and an object of the present invention is to realize an efficient hermetic compressor by suppressing distortion of the stator core and reducing magnetic loss inside the core.

  In order to solve the above-mentioned conventional problems, the stator of the brushless motor of the present invention is composed of laminated iron plates, and compresses the stator, which is integrally crimped with an end plate larger than the outer diameter of the stator. The body shell constituting the pressure vessel of the machine is clamped and fixed, and most of the clamped stress is received by the end plate.

  As a result, the pull-out strength is maintained, the distortion of the stator core is reduced, and the magnetic loss of the core is suppressed, so that the motor efficiency is improved.

  If the stator of this invention is used, since the loss of a motor can be suppressed, an efficient hermetic electric compressor can be realized.

Sectional drawing of the hermetic type electric compressor in embodiment of this invention The perspective view of the stator in embodiment of this invention FIG. 3 is an exploded view of the stator core in the embodiment of the present invention. The perspective view which shows the shape of the end plate of this invention Sectional drawing of the stator in embodiment of this invention

  The present invention is a stator constituting a brushless motor used in a hermetic electric compressor, and the stator is composed of laminated iron plates, and an end plate having an outer diameter larger than the outer diameter of the stator is integrally formed. By fixing the crimped stator to the shell forming the pressure vessel of the compressor, and fixing the crimp, and receiving most of the crimp stress by the end plate, the fixing strength is maintained, Since the magnetic loss due to the distortion of the stator core can be suppressed, the motor loss due to the magnetic loss is reduced and an efficient hermetic electric compressor can be realized.

  Embodiments of the present invention will be described below with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a sectional view of a hermetic electric compressor using a stator of a brushless motor according to the present invention.

  The stator 1 is squeezed and fixed to the trunk shell 6. The rotor 2 is fixed to the rotating shaft 4 of the mechanical unit 3 of the compressor, and the other end of the rotating shaft 4 is held by the bearing 5. The body shell 6 and the upper and lower shells 7 and 8 constitute a pressure vessel. The upper shell 7 is provided with a suction pipe 9 and a power supply terminal 11, and the body shell is provided with a discharge pipe 10.

  FIG. 2 is a perspective view of the stator of the brushless motor of the present invention, and FIG. 3 is an exploded view of the stator core.

  In the figure, as shown in FIG. 3, the stator shown in FIG. 2 has an end plate 13 that passes through the mounting holes 12a and 13a in advance through the stator core 12 and is caulked and fixed with caulking pins 14. The winding 15 is wound and interphase insulating paper 18 is inserted between the phases.

  FIG. 4 is a view showing the shape of the end plate.

  FIG. 5 shows a sectional view of the stator 12. In the figure, the outer diameter of the end plate 13 is different from the outer diameter of the stator core 12 by 2d = + 50 μm to +100 μm. Furthermore, the caulking strength between the end plate and the stator core is suppressed to such an extent that the caulking force can sufficiently slide.

  About the stator comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, when the stator 2 is shrunk into the shell 6, the shatter stress is preferentially subjected to the stress because the outer diameter of the end plate 13 is large. The value is optimally selected from the core size and stack thickness to the extent that there is no influence of core distortion within the intersection.

  Here, it is possible to receive stress at the 100% end plate. However, when the stress applied to the stator core becomes zero, a gap is generated between the core and the shell, and chatter vibration is generated. Therefore, it is set to be about an intermediate size that does not affect the magnetic loss.

  The reason why the range of the dimension 2d is provided is that the strain on the stator core increases when the thickness is 50 μm or less, and a gap may be formed between the core and the core when the size is 100 μm or more.

  Of course, if the thickness of the end plate can be changed freely, the degree of freedom increases, but it is necessary to make it 5 mm or less in consideration of the space insulation distance and magnetic leakage. Therefore, this range is necessary. In this embodiment, it is 3 mm.

  On the other hand, the caulking strength between the end plate and the core can be easily slid by the shrinkage force, even if the stator core is first subjected to tightening stress due to eccentricity etc. It is for doing so. However, even if it slips, it moves in parallel and follows the axial center of the shell, which does not affect the assembly accuracy.

  As described above, in the present embodiment, since all the shrinkage stress is not applied to the stator core as in the conventional case, the magnetic loss due to the core distortion is suppressed, while the pull-out strength can be sufficiently secured by the end plate. An efficient hermetic electric compressor can be realized without functional problems.

  INDUSTRIAL APPLICABILITY According to the present invention, not only a hermetic electric compressor but also a method for fixing a stator of a motor housed in a cylindrical container can be applied to various uses.

DESCRIPTION OF SYMBOLS 1 Stator 2 Rotor 3 Mechanical part 4 Rotating shaft 5 Bearing 6 Body shell 7 Upper shell 8 Lower shell 9 Suction pipe 10 Discharge pipe 11 Power supply terminal 12 Stator core 12a Mounting hole 13 End plate 13a Mounting hole 14 Caulking pin 15 Winding 16 Insulating paper 17 Correlated insulating paper

Claims (2)

A stator that constitutes a brushless motor used in a hermetic compressor is made of laminated iron plates, and the stator having a crimped end plate larger than the outer diameter of the stator is used as a pressure vessel for the compressor. Is a hermetic compressor that is fastened to a shell shell that constitutes the inner shell and is fixed by a flange and receives most of the tightening stress by an end plate. A hermetic compressor which is an iron plate having an outer diameter difference of 50 to 100 μm and a thickness of 3 to 5 mm from the stator core of the end plate.

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