JP2006304460A - Stator for rotary electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stator for a rotary electric machine capable of suppressing torque pulsation during its running by reducing strain generated at a teeth portion on the stator for the rotary electric machine using a split core. <P>SOLUTION: This stator for a rotary electric machine is equipped with a stator core formed by mutually welding yoke portions 13 of a plurality of split cores 10 divided in the peripheral direction. Mutually butted portions 13a, 13b of the plurality of yoke portions 13a, 13b are formed with clearances 2, 3 corresponding to a shinkage amount after previous welding. The split cores adjacent to each other near between the clearances are mutually welded to each other, thus solving the above problem. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a stator of a rotating electric machine that uses a split core in which a stator core core is divided into a plurality in the circumferential direction.

  Conventionally, in a stator of a rotating electric machine using a split core, the joint between split cores is shaped so as to be a perfect circle before welding, and the true circle is maintained according to welding conditions and shrink-fitting conditions. (For example, see Patent Document 1).

Japanese Patent Laid-Open No. 2000-078779 (first page, FIG. 1)

  In the stator of a rotating electrical machine according to the prior art as described above, even if the welding conditions and shrinkage fitting conditions are optimum, the tooth portion facing the rotor of the stator is distorted, and this is the torque generated during operation of the rotating electrical machine. There was a problem of becoming one of the causes of pulsation.

  The present invention has been made to solve the above-described problems of the prior art, and provides a stator of a rotating electrical machine that can reduce distortion generated in a tooth portion of the stator and reduce torque pulsation during operation. The purpose is that.

  A stator of a rotating electrical machine according to the present invention is a stator of a rotating electrical machine having a stator core formed by welding yoke parts of a split core divided into a plurality of parts in the circumferential direction. A gap corresponding to the amount of shrinkage after welding is formed in advance in the mating portion, and adjacent divided cores are welded in the vicinity of the gap.

  In the present invention, a gap corresponding to the shrinkage after welding is provided at the abutting portion between the yoke portions of the adjacent divided cores, and the adjacent divided cores are welded in the vicinity of the gap. Thus, a stator for a rotating electrical machine with extremely little torque pulsation during operation of the rotating electrical machine can be obtained.

Embodiment 1 FIG.
1-4 is a figure explaining the principal part of the stator of the rotary electric machine by Embodiment 1 of this invention, Fig.1 (a) is the shape of a 1st iron core, and the butt | matching of the yoke parts mutually Fig. 1 (b) is an exaggerated view of the gap provided in the part, Fig. 1 (b) is an exaggerated view of the shape of the second iron core and the gap provided in the abutting part between the yoke parts, Fig. 2 1 (a) and 1 (b) are perspective views showing a state in which several iron cores are alternately stacked, FIG. 3 is a detailed view illustrating the relationship between the welding position and the gap in the butting portion, and FIG. It is an assembly drawing which shows the condition when assembling a split core into a cylindrical shape. Note that the same reference numerals denote the same or corresponding parts throughout the drawings.

  In the figure, the iron core 1 constituting the split core 10 is shown in FIG. 1 (b), a first iron core 1A formed so that the butting portion 13a protrudes gently as shown in FIG. 1 (a). Thus, the abutting portion 13c is composed of two types of cores of the second iron core 1B formed so as to largely protrude, and the split core 10 has several first and second iron cores 1A and 1B each of which is a shaft. The layers are alternately stacked in the direction. For the sake of explanation, when there is no need to distinguish the difference in pattern, it will be simply referred to as the iron core 1 for the sake of convenience. The iron core 1 includes a tooth portion 11, a magnetic pole portion 12, and a yoke portion (core back) 13. When the adjacent iron cores having the same pattern are brought into contact with each other, the first iron core 1A is opposed to each other. A gap 2 is formed on the outer peripheral side between the portions 13a and 13b, and the inner peripheral side is configured to abut on the abutting portion B.

  On the other hand, in the second iron core 1B, similarly, a gap 3 is formed on the outer peripheral side between the facing portions 13c and 13d facing each other, and the inner peripheral side is in contact with the contact portion B. . Each of the gaps 2 and 3 is formed to have a size commensurate with the shrinkage after welding, and is shown exaggerated and larger than the actual size in the figure. Note that the dimensions of the gaps 2 and 3 are, for example, about 0.1 mm, but it depends on the size of the rotating electrical machine, the number of welded portions in the outer peripheral direction, and the like, and it is needless to say that the dimensions are not limited to the above dimensions.

  The divided core 10 shown in FIG. 2 formed by alternately laminating several first and second iron cores 1A and 1B as described above is wound around a tooth portion 11 and in the vicinity thereof by providing necessary insulating members. After the line, adjacent split cores are joined together by welding, and assembled into a cylindrical stator as shown in FIG. In FIG. 4, illustration of insulating members, windings, and the like is omitted. As shown in detail in FIG. 3, the welded portion A straddles the iron core 1A and the iron core 1B in a portion where the first iron core 1A and the second iron core 1B are alternately stacked in the vicinity of the gaps 2 and 3. Are welded discontinuously in the axial direction.

  In the first embodiment configured as described above, since the gaps 2 and 3 are formed in the vicinity of the welded portion A between the split cores 10, the expansion and contraction displacement generated in the yoke portion 13 before and after welding is applied. The gaps 2 and 3 are absorbed with the contact portion B as a fulcrum, and the tip portions 12a and 12b of the magnetic pole portion 12 are displaced in the direction of the arrow C in FIG. Can be prevented. For this reason, for example, when used as an electric motor for an elevator hoisting machine, torque pulsation caused by the deviation can be reduced, which can contribute to improvement of riding comfort by reducing vibration.

Embodiment 2. FIG.
FIG. 5 is a diagram for explaining a main part of a stator of a rotating electrical machine according to Embodiment 2 of the present invention. FIG. 5 (a) is provided at the shape of the third iron core and the abutting part between the yoke parts. The figure which exaggerated and shows the gap, (b) exaggeratedly shows the shape of the 4th iron core, and the gap provided in the butt | matching part of the yoke part, (c) is Drawing 5 (a) and It is a perspective view which shows the state which laminated | stacked several iron cores shown in FIG.5 (b) alternately. In the second embodiment, the contact portion B is provided on the inner peripheral side in the first embodiment, and the gaps 2 and 3 are formed to open from the inner peripheral side in the radial direction toward the outer peripheral side. On the other hand, the contact portion D is provided on the outer peripheral side, and the gaps 4 and 5 are formed so as to open from the radially outer peripheral side toward the inner peripheral side.

  In the figure, as shown in FIG. 5A, the third iron core 1C has a butt portion 13e on the right side of the figure formed with a large inclination from the outer peripheral side toward the inner peripheral side, and the butt portion on the left side of the figure. 13f is formed so that the inclination is slightly looser so that the gap 4 is formed on the inner peripheral side when they abut. On the other hand, as shown in FIG. 5 (b), the fourth iron core 1D has a butt portion 13g on the right side of the figure formed so that the inclination from the outer peripheral side to the inner peripheral side is smaller than that of the iron core 1C. The abutting portion 13h is formed with a smaller inclination so that the gap 5 is formed on the inner peripheral side when abutting. The sizes of the gaps 4 and 5 are the same as those in the first embodiment. Since other reference numerals are the same as those in the first embodiment, description thereof is omitted.

  The second embodiment configured as described above operates in the same manner as in the first embodiment, and the expansion / contraction before and after welding that occurs in the same manner is provided in the abutting portions 13e, 13f, 13g, and 13h. With the contact portion D as a fulcrum, the gaps 4 and 5 are absorbed when the dimensions thereof change in the circumferential direction, so that the deflection of the tips of the magnetic pole portion 12 can be prevented and torque pulsation caused by the deflection can be reduced. The effect that it can be obtained.

  In the description of each of the above embodiments, the gaps 2 to 5 have dimensions suitable for shrinkage due to welding. However, when the stator core assembled by welding is fixed to a frame, a housing, or the like by shrink fitting, By making the shrinkage allowance due to the compressive stress accompanying the fitting further a size commensurate with the shrinkage due to the welding of the divided cores, it is possible to further prevent the tip portions of the magnetic pole portion 12 from being offset from each other. The resulting torque pulsation can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing which shows the principal part of the stator of the rotary electric machine by Embodiment 1 of this invention, (a) exaggerated the clearance gap provided in the shape of the 1st iron core and its butt | matching part. FIG. 6B is an exaggerated view of the shape of the second iron core and the gap provided at the abutting portion between the yoke portions. It is a perspective view which shows the state which laminated | stacked several iron cores shown to Fig.1 (a) and FIG.1 (b) alternately. It is detail drawing which illustrates the relationship between the welding position and the clearance gap in the butt | matching part of the split core shown in FIG. It is an assembly figure which shows the condition when the division | segmentation core shown in FIG. 1 is assembled cylindrical. It is a figure explaining the principal part of the stator of the rotary electric machine by Embodiment 2 of this invention, (a) exaggerated the clearance gap provided in the shape of the 3rd iron core, and its yoke part mutual butting. FIG. 5B is an exaggerated view of the shape of the fourth iron core and the gap provided at the abutting portion between the yoke portions, and FIG. 5C is an illustration of FIG. It is a perspective view which shows the state which laminated | stacked several iron cores shown in b) alternately.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Iron core, 1A 1st iron core, 1B 2nd iron core, 1C 3rd iron core, 1D 4th iron core, 2, 3, 4, 5 clearance, 10 division | segmentation core, 11 tooth part, 12 magnetic pole part, 12a, 12b tip part, 13 yoke part, 13a, 13b, 13c, 13d butting part, A welding part, B, D contact part.

Claims (5)

  In a stator of a rotating electric machine having a stator core formed by welding yoke parts of a split core divided into a plurality of parts in the circumferential direction, the butt part between the yoke parts has a shrinkage amount after welding in advance. A stator for a rotating electrical machine, wherein a gap corresponding to the gap is formed, and adjacent divided cores are welded in the vicinity of the gap.   The stator of a rotating electrical machine according to claim 1, wherein the gap is a gap obtained by further adding a shrinkage allowance due to compressive stress accompanying shrink fitting after welding.   3. The abutting portions between the yoke portions are alternately formed in a concavo-convex shape at predetermined intervals in the axial direction, and are fitted to each other when they are abutted. The stator of the described rotating electrical machine.   The abutting portion between the yoke portions has an abutting portion on the radially inner peripheral side, and is formed so that a gap increases toward the radially outer peripheral side. Item 4. A stator of a rotating electrical machine according to any one of Items 3.   The butt portion between the yoke portions has an abutting portion on the radially outer peripheral side, and is formed so that a gap increases toward the radially inner peripheral side. Item 4. A stator of a rotating electrical machine according to any one of Items 3.

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