JP4717089B2 - Electric motor stator, electric motor, compressor and blower - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a stator core constituting a stator of an electric motor, and in particular, material removal when punching a plurality of stator core plates (electromagnetic steel plates punched from a hoop material) that are stacked to become a stator core. The present invention relates to the shape of the stator core plate that can enhance The present invention also relates to an electric motor, a compressor, and a blower that use the stator of the electric motor.

Conventionally, a plurality of electrical steel sheets have been used for the purpose of obtaining a high-efficiency and low-cost single-phase motor by securing a magnetic path for the stator core core back and making it possible to obtain a good material A stator core formed by stacking and having slots, and a single-phase two-pole distributed winding composed of a main winding and an auxiliary winding provided in the slot; and In a single-phase motor equipped with a rotor arranged on the inner periphery of the stator via a gap, the outer periphery of the stator core has five or more substantially linear notches, and five or more cuts. There has been proposed a single-phase motor that forms a quadrangle with straight lines including four notches in the notch (see, for example, Patent Document 1).
JP 2006-238507 PR

  However, the stator core described in Patent Document 1 has five or more substantially linear notches on the outer periphery of the stator core, and four of the five notches are notched. In this case, when punching out the stator core plate with a mold, the material removal will improve if processed in one row, but if two rows or three rows are removed There was a problem that material removal was not improved. Detailed description will be described later.

  The present invention has been made to solve the above-described problems. When a stator core plate is punched in a plurality of rows with a mold, the stator of an electric motor that can improve material removal and reduce the material cost, and An object is to provide an electric motor, a compressor, and a blower.

The stator of the electric motor according to the present invention is a stator of an electric motor including a stator core configured by stacking a plurality of stator core plates in which teeth are formed between slots.
The stator core plate
Three substantially straight first cutouts are provided on the outer periphery,
Three first cutouts are arranged at a right angle between adjacent ones,
On opposite sides of the first notch in the middle of the three first notches, on both sides of the vertical center line passing through the approximate center of the central first notch and the approximate center of the stator core plate , Providing two substantially straight second notches,
The two second cutouts are provided substantially at right angles to the straight line passing through the approximate center of the stator core plate and the teeth.
When two rows of stator core plates are cut out by shifting each other by about 1/2 pitch of the stator core plate, the first and second rows of stator core plates are punched in a state where the second notches are in contact with each other. It is characterized by that.

  When the stator cores of the electric motor according to the present invention are shifted from each other by approximately ½ pitch of the stator core plate and the stator core plates are extracted in two rows, the first and second rows of stator core plates are: Since the second notch is punched in contact, material removal is improved and material cost can be reduced.

Embodiment 1 FIG.
FIGS. 1 to 5 are views showing a stator core plate 1 of a general motor shown for comparison. FIG. 1 is a plan view of the stator core plate 1 after punching whose outer shape is circular, and FIG. The figure which shows the state at the time of punching the core iron plate 1 with a metal mold | die, FIG. 3 is a top view of the stator iron core board 1 after the punching which has the four notches 5 in an outer peripheral part, FIG. 4 is a stator of FIG. FIG. 5 is a diagram showing a state when the iron core plate 1 is punched with a mold, and FIG. 5 is a diagram showing a state when the stator core plate 1 of FIG. 3 is punched with two dies.

  A general stator core plate 1 of an electric motor will be described with reference to FIGS. 1 to 4. A stator core of an electric motor is manufactured by stacking thin stator core plates 1 (electromagnetic steel plates) having a thickness of about 0.1 to 1.0 mm punched into a predetermined shape and fixing them by caulking, welding, or the like. .

  The stator core plate 1 has, for example, a circular outer shape as shown in FIG. 1 or a linear notch 5 as shown in FIG.

  A stator core plate 1 having a circular outer shape shown in FIG. 1 is a slot 2 (space) in which a winding is applied through an insulator in the state of a stator core in which a plurality of stator core plates 1 are stacked. Are arranged at substantially equal intervals in the circumferential direction. In the example of FIG. 1, the number of slots 2 is 18.

  A space between adjacent slots 2 is called a tooth 8 constituting a part of a magnetic path through which a magnetic flux passes. The circumferential width of the teeth 8 is substantially equal to the radial direction. Accordingly, the circumferential width of the slot 2 gradually increases from the inner periphery toward the outer periphery.

  The stator core plate 1 has a substantially donut shape. The inner peripheral portion has a circular shape like the outer peripheral portion. However, the slot 2 is open on the inner peripheral side. This open portion is generally called a slot opening 2a (or slot opening). Because of the slot opening 2a, the inner periphery of the stator core plate 1 is a discontinuous circle. The slot opening 2 a is necessary for accommodating the winding in the slot 2. In order to accommodate the winding, the slot opening 2a should be wide. However, when the slot opening 2a is widened, there is a problem that a gap (substantially) formed between the stator and the rotor becomes large or the magnetic circuit is not smooth. Therefore, the slot opening 2a is designed to be as small as possible within the range in which winding is possible.

  A space between the slot 2 and the outer peripheral portion of the stator core plate 1 is a core back 3 that constitutes a part of a magnetic path through which a magnetic flux passes, similarly to the teeth 8. The core back 3 has a substantially donut shape in which the radial length is substantially the same in the circumferential direction and the magnetic flux flows uniformly.

  FIG. 2 shows a state when the stator core plate 1 shown in FIG. 1 is punched from the hoop material 4. Since the outer shape of the stator core plate 1 is circular, the width of the hoop material 4 needs to be larger than the outer diameter of the stator core plate 1. Further, the length of the hoop material 4 is required to be at least substantially the same as the outer diameter of the stator core plate 1 for each stator core plate 1. Therefore, there is a lot of waste in material collection, and the material price becomes high.

  The stator core plate 1 shown in FIG. 3 is an example in which a circular outer shape improves the point that waste is increased in material removal. As shown in FIG. 3, the stator core plate 1 includes linear notches 5 at substantially equal intervals (90 °) at four locations on the outer peripheral portion. As the length of the straight line of the notch 5 becomes longer, the outer shape becomes smaller, but the radial width of the core back 3 becomes shorter. An arc is formed between adjacent notches 5. This is the arc portion 6.

  As shown in FIG. 4, the linear notch 5 of the stator core plate 1 is punched out in accordance with the longitudinal direction of the hoop material 4 and the direction perpendicular to the hoop material 4. The length in the longitudinal direction required for the sheet can be made shorter than in the case of FIG. 2 (outer shape of the stator core plate 1 having a circular shape). Waste in material removal is reduced, and material costs can be reduced.

  However, the stator core plate 1 shown in FIG. 3 (having linear notches 5 at substantially equal intervals (90 °) at four locations on the outer peripheral portion) is formed by two rows of molds as shown in FIG. When punching, there are the following problems.

  That is, in order to shorten the width dimension of the hoop material 4, the second row of stator core plates 1 (lower side in FIG. 5) is longer than the first row of stator core plates 1 (upper side in FIG. 5). The stator core plate 1 is punched out with a shift of approximately ½ pitch (approximately ½ of the distance between the notches 5 facing each other).

  At this time, the stator core plate 1 in the first row and the stator core plate 1 in the second row are in a state in which the arc portions 6 are close to each other. If the arc portion 6 is linear, the width of the hoop material 4 can be shortened as compared to the arc portion 6.

  FIGS. 6 to 17 show the first embodiment, and FIG. 6 has linear notches 5 (notches 5a and 5b) at five locations on the outer peripheral portion, and five notches 5 are provided. FIG. 7 is a diagram showing a state when the stator core plate 10 of FIG. 6 is punched in two rows by a mold, and FIG. 8 is a straight line of the first modification. FIG. 9 is a plan view of a stator core plate 10 having a notch 5 (notch 5a, notch 5b) at five locations on the outer periphery and forming a pentagon with straight lines including the five notches 5; FIG. 10 is a view showing a state in which the stator core plate 10 of FIG. 8 is punched out in two rows by a mold, and FIG. 10 is a diagram showing a straight cutout 5 (cutout 5a, cutout 5b) of the second modification; FIG. 11 is a plan view of a stator core plate 10 having a straight line including five notches 5 and forming a pentagon, and FIG. 11 shows the stator core plate 10 of FIG. FIG. 12 is a diagram showing a state of punching in two rows by a mold, and FIG. 12 has five straight cutouts 5 (cutouts 5a and 5b) of the third modification, and five cutouts 5 is a plan view of a stator core plate 10 that forms a pentagon with a straight line including 5, FIG. 13 is a diagram showing a state when the stator core plate 10 of FIG. 12 is punched in two rows by a mold, and FIG. A plan view of a stator core plate 10 having a straight notch 5 (notch 5a, notch 5b) at five locations on the outer periphery and forming a pentagon with straight lines including the five notches 5; 15 is a view showing a state in which the stator core plate 10 of FIG. 14 is punched in two rows by a mold, and FIG. 16 is an outer peripheral portion of the linear notches 5 (notches 5a and 5b) of Modification 5. FIG. 17 is a plan view of the stator core plate 10 that forms a pentagon with straight lines including the five notches 5. 6 stator core plate 10 is a diagram showing a state in which punching in two rows by the mold.

  The shape of the stator core plate 10 shown in FIG. 6 will be described. The stator core plate 1 is the same as the stator core plate 1 of FIG. 1 except for the notches 5a and 5b on the outer peripheral portion. Adjacent ones of the three notches 5a (first notches) on the outer peripheral portion are arranged at approximately 90 °. The three notches 5a are arranged substantially perpendicular to each other. And the center notch 5a (lower side in FIG. 6) in the three notches 5a is opposed to the teeth 8. The other two notches 5a (on the right and left sides in FIG. 6) are opposed to the slot 2 at the center.

  The outer peripheral portion (upper side in FIG. 6) of the stator core plate 10 in which the central notch 5a (lower side in FIG. 6) is not formed between the other two notches 5a (right side and left side in FIG. 6). ), Two notches 5b are formed.

  In other words, the opposite side of the central notch 5a (lower side in FIG. 6) between the other two notches 5a (right side and left side in FIG. 6) is the arc portion 6. Two cutouts 5b (second cutouts) are formed on both sides of the arc portion 6.

  In FIG. 6, the notch 5b on the right side with respect to the vertical center line of the stator core plate 10 is the third clockwise when the tooth 8 (upper side in FIG. 6) whose vertical center line coincides with the center line is used as a reference. It is formed substantially perpendicular to the center line 7 of the tooth 8.

  In FIG. 6, the notch 5b on the left side with respect to the longitudinal center line of the stator core plate 10 is the third counterclockwise when the teeth 8 (upper side in FIG. 6) whose longitudinal center line coincides with the center line is used as a reference. The teeth 8 are formed substantially perpendicular to the center line 7 of the teeth 8.

  An arc portion 6 is formed between the two notches 5b (the closer one).

  When the stator core plates 10 are punched in two rows by a mold, the first row of stator core plates 10 is oriented upside down as shown in FIG. Moreover, the stator core plates 10 in the second row are in the same direction as in FIG.

  In order to shorten the width dimension of the hoop material 4, the second row of stator core plates 1 (lower side in FIG. 7) is fixed in the longitudinal direction with respect to the first row of stator core plates 1 (upper side in FIG. 7). Punching is performed with a shift of approximately ½ pitch of the core iron core plate 1 (approximately ½ of the distance between the facing notches 5a).

  The stator core plates 10 in the first row are punched so that the left and right cutouts 5a (right side and left side in FIG. 7) are in contact with each other.

  The stator core plate 10 in the first row and the stator core plate 10 in the second row are punched so that the two notches 5b come close to each other.

  The stator core plate 10 in the first row and the stator core plate 10 in the second row are punched so that the linear notches 5b are in contact with each other. Is possible.

  The two linear notches 5b are formed substantially perpendicular to the center line 7 of the tooth 8 passing through the center of the stator core plate 10. Thereby, the core back 3 becomes the widest in the position which arrange | positions the notch 5b. In other words, the two straight cutouts 5b are formed at two locations as compared to the case where the straight cutouts 5b are formed substantially at right angles to the center line (not shown) of the slot 2 passing through the center of the stator core plate 10. When the linear notch 5b is formed substantially perpendicular to the center line 7 of the tooth 8 passing through the center of the stator core plate 10, the core back 3 at the notch 5b becomes wider. Therefore, the magnetic flux density of the core back 3 part is lowered, and the efficiency is improved. In addition, since the influence of magnetic flux saturation is reduced, the magnetic permeability of the core back 3 becomes nearly uniform, the flow of magnetic flux becomes constant, and this is effective in reducing sound and vibration.

  FIG. 8 shows a stator core plate which has the linear notches 5 (notches 5a and 5b) of the first modification at five locations on the outer periphery and forms a pentagon with straight lines including the five notches 5. 10 is a plan view of FIG.

  In FIG. 8, the notch 5b on the right side with respect to the longitudinal center line of the stator core plate 10 is the second clockwise when the teeth 8 (upper side in FIG. 8) whose center line coincides with the longitudinal center line. It is formed substantially perpendicular to the center line 7 of the tooth 8.

  In FIG. 8, the notch 5b on the left side with respect to the longitudinal center line of the stator core plate 10 is the second counterclockwise when the teeth 8 (upper side in FIG. 8) whose center line coincides with the longitudinal center line. The teeth 8 are formed substantially perpendicular to the center line 7 of the teeth 8.

  As shown in FIG. 9, the stator core plate 10 having the shape shown in FIG. 8 is also arranged such that the first row of stator core plates 10 and the second row of stator core plates 10 are in contact with the linear notches 5b. Since it is punched out, the width dimension of the hoop material 4 can be shortened as compared with the case of contact with the arc portion 6.

  Further, the two linear notches 5 b of the stator core plate 10 having the shape shown in FIG. 8 are formed substantially perpendicular to the center line 7 of the teeth 8 passing through the center of the stator core plate 10. Thereby, the core back 3 becomes the widest in the position which arrange | positions the notch 5b similarly to the stator core board 10 of FIG. Therefore, the magnetic flux density of the core back 3 part is lowered, and the efficiency is improved. In addition, since the influence of magnetic flux saturation is reduced, the magnetic permeability of the core back 3 becomes nearly uniform, the flow of magnetic flux becomes constant, and this is effective in reducing sound and vibration.

  FIG. 10 shows a stator core plate that has the linear notches 5 (notches 5a and 5b) of the second modified example at five locations on the outer peripheral portion and forms a pentagon with straight lines including the five notches 5. 10 is a plan view of FIG.

  The shape of the stator core plate 10 shown in FIG. 10 will be described. As in FIG. 6, the three notches 5a on the outer peripheral portion are arranged at approximately 90 ° between adjacent ones. The three notches 5a are arranged substantially perpendicular to each other. And the center notch 5a (lower side in FIG. 10) in the three notches 5a faces the slot 2 at the center. The other two notches 5a (on the right and left sides in FIG. 6) have their centers facing the teeth 8.

  Between the other two cutouts 5a (right side and left side in FIG. 10), two cutouts 5b are formed on opposite sides of the central cutout 5a (lower side in FIG. 10). Two notches 5 b are formed on both sides of the longitudinal center line of the stator core plate 10. In this case, the arc portion 6 does not exist between the two notches 5b. The vertical center line of the stator core plate 10 coincides with the center line of the slot 2.

  In FIG. 10, the notch 5b on the right side with respect to the vertical center line of the stator core plate 10 is relative to the center line 7 of the first tooth 8 on the right side (clockwise) of the slot 2 where the vertical center line coincides with the center line. Formed substantially at right angles.

  In FIG. 10, the notch 5b on the left side with respect to the vertical center line of the stator core plate 10 is formed on the center line 7 of the first tooth 8 on the left side (counterclockwise) of the slot 2 where the center line coincides with the vertical center line. It is formed at a substantially right angle to it.

  As shown in FIG. 11, the stator core plate 10 having the shape shown in FIG. 10 is also arranged such that the first row of stator core plates 10 and the second row of stator core plates 10 are in contact with the linear notches 5b. Since it is punched out, the width dimension of the hoop material 4 can be shortened as compared with the case of contact with the arc portion 6.

  Further, the two linear notches 5 b of the stator core plate 10 having the shape shown in FIG. 10 are formed substantially perpendicular to the center line 7 of the teeth 8 passing through the center of the stator core plate 10. Thereby, the core back 3 becomes the widest in the position which arrange | positions the notch 5b similarly to the stator core board 10 of FIG. Therefore, the magnetic flux density of the core back 3 part is lowered, and the efficiency is improved. In addition, since the influence of magnetic flux saturation is reduced, the magnetic permeability of the core back 3 becomes nearly uniform, the flow of magnetic flux becomes constant, and this is effective in reducing sound and vibration.

  FIG. 12 shows a stator core plate that has the linear notches 5 (notches 5a and 5b) of Modification 3 at five locations on the outer periphery and forms a pentagon with straight lines including the five notches 5. 10 is a plan view of FIG.

  In FIG. 12, the notch 5b on the right side with respect to the longitudinal center line of the stator core plate 10 is formed on the center line 7 of the second tooth 8 on the right side (clockwise) of the slot 2 where the center line coincides with the longitudinal center line. It is formed at a substantially right angle to it.

  In FIG. 12, the notch 5b on the left side with respect to the vertical center line of the stator core plate 10 is the center line 7 of the second tooth 8 on the left side (counterclockwise) of the slot 2 where the center line coincides with the vertical center line. It is formed at a substantially right angle to.

  As shown in FIG. 13, the stator core plate 10 having the shape shown in FIG. 12 is also arranged so that the first row of stator core plates 10 and the second row of stator core plates 10 are in contact with the linear notches 5b. Since it is punched out, the width dimension of the hoop material 4 can be shortened as compared with the case of contact with the arc portion 6.

  Further, the two linear notches 5 b of the stator core plate 10 having the shape shown in FIG. 12 are formed substantially at right angles to the center line 7 of the teeth 8 passing through the center of the stator core plate 10. Thereby, the core back 3 becomes the widest in the position which arrange | positions the notch 5b similarly to the stator core board 10 of FIG. Therefore, the magnetic flux density of the core back 3 part is lowered, and the efficiency is improved. In addition, since the influence of magnetic flux saturation is reduced, the magnetic permeability of the core back 3 becomes nearly uniform, the flow of magnetic flux becomes constant, and this is effective in reducing sound and vibration.

  The two straight cutouts 5 b may be substantially perpendicular to the center of the stator core plate 10 and the straight line passing over the teeth 8, even if it is not the center line 7 of the teeth 8 passing through the center of the stator core plate 10. Produces the same effect.

  FIG. 14 shows a stator core plate that has the linear cutouts 5 (cutouts 5a and 5b) of the modified example 4 at five locations on the outer peripheral portion and forms a pentagon with straight lines including the five cutouts 5. 10 is a plan view of FIG.

  FIG. 14 shows one limit line 17 (vertical center line side) of the straight line passing through the center of the allowed stator core plate 10 and the teeth 8 in the stator core plate 10 of FIG.

  As shown in FIG. 15, the stator core plate 10 having the shape shown in FIG. 14 is also arranged so that the first row of stator core plates 10 and the second row of stator core plates 10 are in contact with the linear notches 5b. Since it is punched out, the width dimension of the hoop material 4 can be shortened as compared with the case of contact with the arc portion 6.

  FIG. 16 shows a stator core plate which has the linear notches 5 (notches 5a and 5b) of the modified example 5 at five locations on the outer peripheral portion and forms a pentagon with straight lines including the five notches 5. 10 is a plan view of FIG.

  FIG. 16 shows an allowable center line of the stator core plate 10 and the other limit line 18 (anti-vertical center line side) of the straight line passing on the teeth 8 in the stator core plate 10 shown in FIG.

  As shown in FIG. 17, the stator core plate 10 having the shape shown in FIG. 16 is also arranged so that the first row of stator core plates 10 and the second row of stator core plates 10 are in contact with the linear notches 5b. Since it is punched out, the width dimension of the hoop material 4 can be shortened as compared with the case of contact with the arc portion 6.

  Thus, one limit line 17 (vertical center line side) of the straight line passing through the center of the stator core plate 10 and the teeth 8 and the other limit of the straight line passing through the center of the stator core plate 10 and the teeth 8 are obtained. The two linear cutouts 5b may be substantially perpendicular to the straight line between the line 18 (on the side opposite to the longitudinal center line).

  The shape of the outer peripheral portion of the stator core plate 10 is at least the end portion in the width direction of the material and the portion in contact with the adjacent stator core plate 10 when the stator core plate 10 is punched from the electromagnetic steel sheet by a die ( The same column and between columns may be linear. Therefore, it is sufficient that there are at least five locations. However, there may be straight portions (notches 5) in addition to the five locations on the outer peripheral portion of the stator core plate 10.

  Further, by making the outer shape of the stator core plate 10 a pentagon, the width of the core back 3 is dispersed, the magnetic flux density can be relaxed, and the motor efficiency is improved.

  In addition, a stator having a pentagonal outer shape of the stator core plate 10 can be used regardless of the winding method. The winding method has the same effect regardless of whether it is distributed winding or concentrated winding.

  The width in the radial direction of the core back 3 between the straight portion (notch 5a, notch b) on the outer peripheral portion of the stator core plate 10 and the slot 2 is the diameter of the core back 3 where the outer peripheral portion has an arc shape. It becomes narrower than the width in the direction. Therefore, the portion of the slot 2 near the straight portion (notch 5a, notch 5b) is made smaller in the radial direction than the slot 2 shape where the outer peripheral portion is close to the arc shape. Thereby, the core back 3 of the linear part (notch 5a, notch 5b) of the outer peripheral part of the stator core plate 10 spreads. Therefore, the magnetic flux density can be relaxed and the motor efficiency can be improved.

  In addition, by making the shape of the outer peripheral portion of the stator symmetrical (with respect to the longitudinal center line), the balance of the flow of magnetic flux is improved, and vibration and noise can be reduced.

  The shape of the stator core plate 10 is also effective in punching two or more rows. The material removal is improved and the material cost can be reduced.

Embodiment 2. FIG.
FIG. 18 is a view showing a stator core plate 1 of a general electric motor shown for comparison, and is a view showing a state when the stator core plate 1 of FIG. 3 is punched out in three rows by a mold.

  In a motor with a large number of productions or a small motor, there is a method of punching electromagnetic steel sheets in three rows when the stator core plate 1 is punched. In this case, as shown in FIG. 18, when the outer shape is a quadrangular shape, adjacent stator core plates 1 between the rows are in contact with each other at the arc portion 6. For this reason, there has been a problem that the material removal deteriorates.

  FIGS. 19 and 20 show the second embodiment. FIG. 19 has linear notches 5 (notches 5a and 5b) at seven locations on the outer periphery, and seven notches 5 are provided. FIG. 20 is a diagram showing a state in which the stator core plate 20 of FIG. 19 is punched out in three rows by a mold.

  The shape of the stator core plate 20 shown in FIG. 19 will be described. The stator core plate 1 is the same as the stator core plate 1 of FIG. 1 except for the notches 5a and 5b on the outer peripheral portion. Three notches 5a (first notches) on the outer peripheral portion are arranged at approximately 90 ° between adjacent ones. The three notches 5a are arranged substantially perpendicular to each other. And the center notch 5a (lower side in FIG. 19) in the three notches 5a faces the teeth 8 at the center. The other two notches 5a (the right side and the left side in FIG. 19) have their centers facing the slot 2.

  On the outer periphery of the stator core plate 20 between the left and center cutouts 5a (right and lower in FIG. 19) and between the center and right cutouts 5a (lower and right in FIG. 19), respectively. A notch 5b (second notch) is formed. These notches 5 b are formed substantially perpendicular to the center line 7 of the tooth 8.

  In FIG. 19, the notch 5b on the right side with respect to the longitudinal center line of the stator core plate 20 (lower right in FIG. 19) is based on the tooth 8 (lower side in FIG. 19) whose center line coincides with the longitudinal center line. Then, it is formed substantially at right angles to the center line 7 of the third tooth 8 in the counterclockwise direction.

  In FIG. 19, the left notch 5b (lower left in FIG. 19) with respect to the longitudinal center line of the stator core plate 20 is based on the teeth 8 (lower side in FIG. 19) whose center line coincides with the longitudinal center line. In the clockwise direction, it is formed at a substantially right angle with respect to the center line 7 of the third tooth 8.

  Further, between the other two notches 5a (right side and left side in FIG. 19), the opposite side of the central notch 5a (lower side in FIG. 19) is an arc portion 6. Further, two notches 5b (second notches) are formed on both sides of the arc portion 6. These notches 5 b are formed substantially perpendicular to the center line 7 of the tooth 8.

  In FIG. 19, the right notch 5b (upper right in FIG. 19) with respect to the vertical center line of the stator core plate 20 is based on the teeth 8 (upper side in FIG. 19) whose vertical center line coincides with the center line. It is formed substantially at right angles to the center line 7 of the third tooth 8 in the clockwise direction.

  In FIG. 19, the left notch 5b (upper left in FIG. 19) with respect to the vertical center line of the stator core plate 20 is based on the teeth 8 (upper side in FIG. 19) whose vertical center line coincides with the center line. It is formed approximately at right angles to the center line 7 of the third tooth 8 counterclockwise.

  When the stator core plates 20 are punched out in three rows by a mold, as shown in FIG. 20, the first row of stator core plates 20 is turned upside down in FIG. The second row of stator core plates 20 is in the same direction as in FIG. Furthermore, the stator core plates 20 in the third row are also in the same direction as in FIG.

  In order to shorten the width dimension of the hoop material 4, the second row of stator core plates 1 (center in FIG. 20) is longer than the first row of stator core plates 1 (upper side in FIG. 20) in the longitudinal direction. Punching is performed with a shift of approximately ½ pitch of the iron core plate 1 (approximately ½ of the distance between the facing notches 5a).

  Further, the stator core plate 1 in the third row (lower side in FIG. 20) is approximately 1 / of the stator core plate 1 in the longitudinal direction with respect to the stator core plate 1 in the second row (center in FIG. 20). Punching is performed with a shift of 2 pitches (approximately ½ of the distance between the opposed notches 5a). The third row of stator core plates 1 and the first row of stator core plates 1 have the same pitch.

  The stator core plates 20 in each row are punched so that the left and right cutouts 5a (right side and left side in FIG. 20) contact each other.

  The first row of stator core plates 20, the second row of stator core plates 20, the second row of stator core plates 20, and the third row of stator core plates 20 are arranged so that the two notches 5 b approach each other. Punched out.

  The first row of stator core plates 20, the second row of stator core plates 20, and the second row of stator core plates 20 and the third row of stator core plates 20 are in contact with linear notches 5b. Since it is punched out, the width dimension of the hoop material 4 can be shortened as compared with the case of contact with the arc portion 6.

  The four linear notches 5b are formed substantially perpendicular to the center line 7 of the tooth 8 passing through the center of the stator core plate 20. Thereby, the core back 3 becomes the widest in the position which arrange | positions the notch 5b. Therefore, the magnetic flux density of the core back 3 part is lowered, and the efficiency is improved. In addition, since the influence of magnetic flux saturation is reduced, the magnetic permeability of the core back 3 becomes nearly uniform, the flow of magnetic flux becomes constant, and this is effective in reducing sound and vibration.

  The shape of the stator core plate 20 shown in FIG. 19 is effective even when punching in three or more rows. The material removal is improved and the material cost can be reduced.

  Further, the shape of the outer peripheral portion of the stator core plate 20 is at least the end portion in the width direction of the material (the hoop material 4) and the adjacent stator core plate when the stator core plate 20 is punched from the electromagnetic steel sheet by a mold. What is necessary is just to make the part which 20 contacts into a linear shape. Therefore, it is sufficient that there are at least seven linear shapes. However, the linear shape of the outer peripheral portion of the stator core plate 20 is effective even if there are seven or more locations.

  Moreover, it is preferable that the four linear notches 5 b are formed substantially at right angles to the center line 7 of the tooth 8 passing through the center of the stator core plate 20. However, other than the center line 7 of the tooth 8, if the four linear notches 5 b are formed substantially perpendicular to the center of the stator core plate 20 and the straight line passing over the tooth 8, The same effect is produced.

  Further, by forming the outer shape of the stator core plate 20 into a heptagon shape (formed with straight lines including three straight cutouts 5a and four straight cutouts 5b), The width is dispersed, the magnetic flux density can be relaxed, and the efficiency is improved.

  Further, since the magnetic flux density distribution of the core back 3 is more uniform than a quadrilateral shape (formed with straight lines including four straight cutouts 5), the disturbance of the magnetic flux density distribution is reduced and noise reduction is achieved. There is also an effect.

  Further, a stator whose outer shape of the stator core plate 20 is a heptagon can be used regardless of the winding method. The same effect can be obtained by any winding method such as distributed winding or concentrated winding.

  Further, the width of the core back 3 between the straight portion (notch 5a, notch 5b) of the outer peripheral portion of the stator core plate 20 and the slot 2 is such that the outer peripheral portion of the stator core plate 20 is an arc-shaped portion. It becomes narrower than the width of the back 3. Therefore, by making the slot 2 near the straight line portion (the notch 5a and the notch 5b) smaller than the slot 2 where the outer peripheral portion is close to the arc shape, the outer peripheral portion of the stator core plate 20 is reduced. Since the core back 3 of the straight portion (the notch 5a and the notch 5b) is widened, the magnetic flux density of the core back 3 is reduced. Thereby, motor efficiency can be improved.

  Further, by making the shape of the stator core plate 20 symmetrical with respect to the longitudinal center line, the balance of the flow of magnetic flux is improved, and vibration and noise can be reduced.

Embodiment 3 FIG.
The stator core plate 10 or the stator core plate 20 of the first embodiment or the second embodiment is laminated to form a stator core, and the stator is manufactured by applying winding or the like to the stator core. By using this stator for an electric motor, a highly efficient and inexpensive electric motor can be obtained.

  Furthermore, by using a sintered rare earth magnet (magnet with high magnetic flux density) for the rotor, it is possible to reduce the size and increase the efficiency of the electric motor.

  Moreover, by mounting this electric motor on a compressor and a blower, a highly efficient and inexpensive compressor and blower can be obtained.

It is a figure which shows the stator iron core board 1 of the common electric motor shown for a comparison, and is a top view of the stator iron core board 1 after the punching whose outer shape is circular. The figure which shows the stator core board 1 of the common electric motor shown for a comparison, and is a figure which shows the state at the time of stamping out the stator core board 1 with a metal mold | die. It is a figure which shows the stator iron core board 1 of the common motor shown for a comparison, and is a top view of the stator iron core board 1 after the punching which has the four notches 5 in an outer peripheral part. It is a figure which shows the stator core board 1 of the common motor shown for a comparison, and is a figure which shows the state at the time of punching out the stator core board 1 of FIG. 3 with a metal mold | die. It is a figure which shows the stator iron core board 1 of the common electric motor shown for a comparison, and is a figure which shows the state at the time of punching out the stator iron core board 1 of FIG. FIG. 5 is a diagram showing the first embodiment, and includes a linear notch 5 (notch 5a, notch 5b) at five locations on the outer periphery, and a stator that forms a pentagon with straight lines including the five notches 5; The top view of the iron core board 10. FIG. FIG. 7 shows the first embodiment, and shows a state when the stator core plate 10 of FIG. 6 is punched in two rows by a mold. In the figure which shows Embodiment 1, it has the linear notch 5 (notch 5a, notch 5b) of the modification 1 in five places of an outer peripheral part, and a pentagon is a straight line including the five notches 5 The top view of the stator iron core board 10 to form. FIG. 9 shows the first embodiment, and shows a state when the stator core plate 10 of FIG. 8 is punched in two rows by a mold. In the figure which shows Embodiment 1, it has the linear notch 5 (notch 5a, notch 5b) of the modification 2 in five places of an outer peripheral part, and a pentagon is a straight line including the five notches 5 The top view of the stator iron core board 10 to form. FIG. 11 shows the first embodiment, and shows a state when the stator core plate 10 of FIG. 10 is punched in two rows by a mold. In the figure which shows Embodiment 1, it has the linear notch 5 (notch 5a, notch 5b) of the modification 3 in five places of an outer peripheral part, and a pentagon is a straight line including the five notches 5 The top view of the stator iron core board 10 to form. It is a figure which shows Embodiment 1, and is a figure which shows the state at the time of punching out the stator core board 10 of FIG. In the figure which shows Embodiment 1, it has the linear notch 5 (notch 5a, notch 5b) of the modification 4 in five places of an outer peripheral part, and a pentagon is a straight line including the five notches 5 The top view of the stator iron core board 10 to form. FIG. 15 shows the first embodiment, and shows a state when the stator core plate 10 of FIG. 14 is punched out in two rows by a mold. In the figure which shows Embodiment 1, it has the linear notch 5 (notch 5a, notch 5b) of the modification 5 in five places of an outer peripheral part, and is a pentagon with the straight line containing the five notches 5 The top view of the stator iron core board 10 to form. FIG. 17 shows the first embodiment, and shows a state when the stator core plate 10 of FIG. 16 is punched in two rows by a mold. It is a figure which shows the stator iron core board 1 of the general electric motor shown for a comparison, and is a figure which shows the state when the stator iron core board 1 of FIG. In the figure which shows Embodiment 2, it has the linear notch 5 (notch 5a, notch 5b) in seven places of an outer peripheral part, and the fixation which forms a heptagon with the straight line containing seven notches 5 is shown. The top view of the core iron core board 10. FIG. FIG. 20 shows the second embodiment, and shows a state when the stator core plate 10 of FIG. 19 is punched out in three rows by a mold.

Explanation of symbols

  1 Stator core plate, 2 slots, 2a slot opening, 3 core back, 4 hoop material, 5 notch, 5a notch, 5b notch, 6 arc portion, 7 center line, 8 teeth, 10 stator core plate , 17 limit line, 18 limit line, 20 stator core plate.

Claims (14)

In a stator of an electric motor including a stator core formed by laminating a plurality of stator core plates in which teeth are formed between slots,
The stator core plate is
Three substantially straight first cutouts are provided on the outer periphery,
The three first cutouts are arranged adjacent to each other at a substantially right angle,
Vertically passing through the approximate center of the first notch in the center and the approximate center of the stator core plate at the opposite side facing the first notch in the center of the three first notches. Two substantially straight second notches are provided on both sides of the center line,
The two second notches include a substantially center of the stator core plate and one limit line on the longitudinal center line side of a straight line passing over the teeth, a substantially center of the stator core plate and the teeth. Provided at a substantially right angle with respect to a straight line passing through the substantial center of the stator core plate between the other limit line on the opposite side of the vertical center line of the straight line passing through,
When the stator core plates are displaced from each other by approximately ½ pitch of the stator core plates and the stator core plates are extracted in two rows, the second notches are in contact with the first and second rows of stator core plates. A stator for an electric motor that is punched in a state.   2. The stator for an electric motor according to claim 1, wherein the two second notches are provided substantially at right angles to a center line of the teeth passing through a substantially center of the stator core plate.   The substantially straight notch is provided in the outer peripheral part of the stator core plate in addition to the three first notches and the two second notches. The stator of the electric motor according to claim 2. In a stator of an electric motor including a stator core formed by laminating a plurality of stator core plates in which teeth are formed between slots,
The stator core plate is
Three substantially straight first cutouts are provided on the outer periphery,
The three first cutouts are arranged adjacent to each other at a substantially right angle,
Two substantially straight second cutouts are provided between the first cutout at the center of the three first cutouts and one and the other of the other first cutouts. Provided,
Vertically passing through the approximate center of the first notch in the center and the approximate center of the stator core plate at the opposite side facing the first notch in the center of the three first notches. On both sides of the center line, two further substantially straight second notches are provided,
When a plurality of rows of the stator core plates are extracted by being shifted from each other by about ½ pitch of the stator core plate, the adjacent stator core plates between the rows are in a state where the second notch is in contact with each other. Punched,
The four second notches include a substantially center of the stator core plate and one limit line on the vertical center line side of a straight line passing over the teeth, a substantially center of the stator core plate and the teeth. A stator for an electric motor, which is provided at a substantially right angle with respect to a straight line passing through a substantially center of the stator core plate between a straight line passing above and the other limit line on the opposite side of the vertical center line .   5. The stator for an electric motor according to claim 4, wherein the four second notches are provided substantially at right angles to a straight line passing through a substantially center of the stator core plate and the teeth.   6. The stator for an electric motor according to claim 5, wherein the four second notches are provided substantially at right angles to a center line of the teeth passing through a substantially center of the stator core plate.   The outer peripheral portion of the stator core plate is an arc portion except for the first notch or the second notch, and the slot close to the first notch or the second notch The stator of the electric motor according to claim 1, wherein the stator is smaller in a radial direction than the slot close to the arc portion.   The stator for an electric motor according to any one of claims 1 to 7, wherein a winding is applied to a slot of the stator core, and the winding method of the winding is concentrated winding or distributed winding.   9. The stator core plate according to claim 1, wherein the stator core plate is symmetric with respect to a longitudinal center line passing through a substantial center of the first notch in the center and a substantial center of the stator core plate. Motor stator.   The stator of an electric motor according to any one of claims 1 to 9, wherein the stator core fixes the stator core plate by caulking.   An electric motor comprising the stator of the electric motor according to claim 1.   The electric motor according to claim 11, further comprising a rotor using a sintered rare earth magnet.   A compressor comprising the electric motor according to claim 11 or 12.   A blower comprising the electric motor according to claim 11 or 12.

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