JP2006271105A - Electric motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric motor in which a stator can sufficiently be fixed by securing the contact area of a housing and the stator, and that can obtain an enlarged coolant passage area and improved efficiency. <P>SOLUTION: Chord length connecting the starting point and the terminal point of an arc portion that is not in contact with the stator on the inside circumferential surface of a housing, is configured to be shorter than the chord length connecting the starting point and the terminal point which intersects an imaginary circle drawn concentrically with the inside circumferential surface of the housing of the cutout portion, in a cutout portion that forms a coolant passage where at least one stator core is not in contact with the housing. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electric motor mounted as a drive source of a refrigerant compressor mainly used for air-conditioning business and household air conditioners, refrigerators, car air conditioners and the like.

  Electric motors installed as driving sources for refrigerant compressors used in air conditioning and home air conditioners, refrigerators, etc., consume a lot of electric power used annually among household appliances, and are even more efficient Is required.

  In addition, in order to improve the performance of the refrigerant compressor on which the electric motor is mounted, the amount of oil discharged to reduce lubrication of the refrigerant compression mechanism and the low-temperature refrigerant flow on the outer peripheral surface of the electric motor. For the purpose of suppressing the temperature rise of the motor due to this, a refrigerant passage is provided by providing a hole or notch in a part of the stator, and further expansion of the refrigerant passage is required.

  Conventionally, the motors installed in these devices have a copper loss reduction by reducing winding resistance for the purpose of reducing power consumption, iron loss reduction by optimizing the material and shape of electromagnetic steel, and fixing the motor. Therefore, it was necessary to improve the input of the motor by reducing the iron loss by relaxing the tightening stress applied by the housing. As the conventional stress relaxation means, there is one as described in Patent Document 1, for example, and will be described below with reference to the drawings.

  FIG. 2 is a structural sectional view of a conventional electric motor, and FIG. 4 is an enlarged view of a refrigerant passage existing in the vicinity of the outer diameter of the stator. A hole 13 serving as a refrigerant passage is provided around the outer diameter of the stator core 17 and a winding 16 is provided to form the stator 11. Further, the rotor 12 is configured at the center of the stator that is rotatable.

As another example, as shown in FIG. 3, there is a method in which a notch having an arch shape in which the radial cross-sectional area of the portion where the stator core is in contact with the housing is smaller than the inner diameter of the housing is provided.

Both motors are configured to relieve stress applied to the stator core. (For example, see Patent Document 1)
JP 2002-213364 A (FIG. 3)

  However, in the conventional configuration, when the refrigerant passage area is further increased, the minimum fixing that affects the efficiency is achieved when the refrigerant passage hole is provided in the vicinity of the outer diameter of the stator on a concentric circle centered on the motor shaft. The hole must be enlarged in the inner diameter side yoke portion with respect to the child yoke width 22, and the efficiency is lowered.

  In addition, in the case where a notch having an arch shape in which the radial cross-sectional area of the portion where the stator core is in contact with the housing is smaller than the inner diameter of the housing is provided, The notch shape must be expanded in the radial direction, the contact area between the stator and the housing is shortened, and it is difficult to hold the stator with the housing. Even when the notch shape of the refrigerant passage is expanded to the inner diameter side while securing the contact area, a notch deeper than the minimum stator yoke width 22 that affects efficiency must be provided in the inner diameter side yoke portion. There is a problem that the efficiency is reduced.

  The present invention solves the above-described problem, and can secure a contact area between the housing and the stator to sufficiently fix the stator, thereby realizing an increase in refrigerant passage area and an increase in efficiency. An object is to provide an electric motor.

  In order to solve the above-described conventional problems, the present invention secures a contact area between a motor housing and a stator mounted as a drive source for a refrigerant compressor used in air-conditioning business and home air conditioners, refrigerators, and the like. In order to realize an increase in refrigerant passage area and higher efficiency, at least one stator core and a notch portion forming a refrigerant passage where the housing is not in contact are not in contact with the stator on the inner peripheral surface of the housing. The ridge length connecting the start point and end point of the isolated part is shorter than the extension connecting the start point and end point intersecting an imaginary circle drawn concentrically with the inner peripheral surface of the housing of the notch part.

  As described above, according to the electric motor of the present invention, at least one stator iron core and the notch portion that forms the refrigerant passage where the housing is not in contact, the isolated portion that is not in contact with the stator on the inner peripheral surface of the housing The length of the string connecting the start point and end point of the motor is shorter than the length of the string connecting the start point and end point intersecting the fictitious circle drawn concentrically with the inner peripheral surface of the housing of the notch. And the stator can be reliably held by the housing, and the refrigerant passage area can be increased without reducing the efficiency of the electric motor. Further, the tightening stress due to the stator iron core being held and fixed by the housing can be relieved, and the efficiency of the electric motor can be improved.

  Further, by mounting the electric motor according to the present invention as a driving source or the like in a refrigerant compressor used for air conditioning business and home air conditioners, refrigerators, etc., oil discharge from the refrigerant compressor is reduced and temperature rise of the electric motor is suppressed. And the performance of the refrigerant compressor can be improved.

Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings.
In addition, this invention is not limited by these Examples.

  FIG. 1 is an enlarged view of a notch for a refrigerant passage on the outer diameter of the stator in the present invention. A coolant passage notch 14 is provided on the outer diameter of the stator core 17, and the stator 11 is formed by being wound around a winding 16. The notch 14 in this case is not a hole but a notch existing in the vicinity of the outer diameter of the stator core 17. The stator 11 is held and fixed by shrinking or press-fitting the housing 18.

  The length of the cutout portion 19 where the stator core and the housing are not in contact with each other is such that when the housing and the electric motor are integrated with each other and the motor is dropped from a certain distance, the housing has a minimum required holding force for holding the electric motor. It is a length that can be secured. Further, the number of cutouts and the shape are not limited to those shown in the figure, and at least one stator iron core and the stator on the inner peripheral surface of the housing are in contact with each other at a cutout portion forming a refrigerant passage where the housing is not in contact. If the extension connecting the start point and end point of the non-isolated part is shorter than the chord length connecting the start point and end point intersecting the fictitious circle drawn concentrically with the inner peripheral surface of the notch, the notch The number and shape are not limited.

  For example, as shown in FIG. 1, in this embodiment, a bottom surface of a notch is provided concentrically with the housing, and the bottom surface has a maximum length 21 of the notch portion in the rotation direction. Even in the case of a special shape as shown in FIGS. 5 and 6, the length 19 of the notch portion where the stator core and the housing are not in contact is set to the maximum length 21 of the notch portion in the rotation direction. By providing it shorter, the housing can relieve the tightening stress caused by holding and fixing the stator core, and the effect of improving the efficiency of the motor when mounted on the refrigerant compressor can be obtained.

  The electric motor according to the present invention can secure the contact area between the housing and the stator, can reliably hold the stator with the housing, and can increase the refrigerant passage area without reducing the efficiency of the electric motor. Moreover, since the efficiency of the electric motor can be improved by relaxing the tightening stress, the oil discharge from the refrigerant compressor can be reduced and the temperature rise of the electric motor can be suppressed, and the performance of the refrigerant compressor can be improved. it can. Therefore, it is effective for an electric motor mounted as a drive source of a refrigerant compressor mainly used for air-conditioning business and household air conditioners, refrigerators, car air conditioners and the like.

  It is also effective for an air-conditioning fan motor or the like used by shrinking the housing into the stator or press-fitting.

The enlarged view of the notch for refrigerant paths in the external shape of the stator in the Example of this invention Cross section of the structure of a conventional motor Enlarged view of refrigerant passage hole near the outer diameter of the stator of a conventional electric motor Enlarged view of the refrigerant passage notch on the outer diameter of the stator of a conventional electric motor The enlarged view (2) of the notch for refrigerant paths in the outer diameter of the stator in the Example of this invention The enlarged view (3) of the notch for refrigerant passages in the outer diameter of the stator in the Example of this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Stator 12 Rotor 13 Hole 14 Notch 15 Stator external shape 16 Winding 17 Stator core 18 Housing 19 The chord length which connected the start point and the end point of the remote part which is not in contact with the stator of the housing inner peripheral surface 20 The portion where the housing and the stator are in contact 21 The chord length connecting the start point and the end point intersecting an imaginary circle drawn concentrically with the inner peripheral surface of the notch portion 22 Minimum stator yoke width

Claims (2)

A motor that has a stator core and a rotor that are laminated and has a housing whose inner diameter is smaller than the outer diameter of the stator. The chord length connecting the starting point and the ending point of the isolated part that is not in contact with the stator on the inner surface of the housing is drawn concentrically with the inner surface of the housing in the notched part. An electric motor characterized by being shorter than the chord length connecting the start and end points intersecting an imaginary circle. A refrigerant compressor comprising the electric motor according to claim 1.

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