JP6074887B2 - Gap gauge used for assembling electric motor and method for manufacturing electric motor - Google Patents

Description

The present invention relates to a gap gauge used for assembling an electric motor and a method for manufacturing the electric motor.

  Conventionally, bearings having outer diameters smaller than the inner diameter of the fuselage casing are respectively attached to both ends of the fuselage casing in which the stator is inserted, and the rotary shaft in which the rotor is extrapolated to the central part of the fuselage casing by the bearings. Is a method of assembling an electric motor, wherein one bearing is inserted into one end portion of a fuselage casing in which a stator is inserted, and the stator is placed inside the stator from the other end side of the fuselage casing to the center portion. A gap gauge for securing a constant gap is positioned between the inner diameter of the rotor and the outer diameter of the rotor, a rotating shaft with the rotor extrapolated is inserted, one end thereof is inserted into one bearing, and the fuselage casing In the other end of the body, with the other bearing relative to the center of one bearing inserted into the other end of the rotating shaft, the fuselage casing can be mounted on both bearings simultaneously or separately from a plurality of positions on the outer peripheral side of the fuselage casing. In Attaching a bearing at both end portions of the body casing in contact, the motor assembly method of removing the gap gauge is disclosed (for example, see Patent Document 1).

  Further, as shown in FIG. 10, the conventional electric motor projects radially from the inner peripheral side of the annular yoke portion 71 toward the center when the cross section in the direction orthogonal to the rotor shaft 81 of the rotor 80 is viewed. There are a plurality of tooth portions 72 that rotate around the rotor shaft 81 at a predetermined interval on the inner peripheral side of the stator 70 with respect to the stator 70 in which the winding is wound around each tooth portion 72. A rotor 80 is arranged as possible. Here, the outer peripheral portion of the rotor 80 has a perfect circle shape. When the rotor 80 is assembled on the inner peripheral side of the stator 70, the rotor 80 is inserted in a state where the gauge pieces 90 of the gap gauges are arranged on the inner peripheral side of the tooth portions 72, and the rotor 80 is The gap gauge was pulled out after being fixed at a position spaced apart from the stator 70 at an equal interval.

JP 11-178293 A

  When assembling the electric motor as shown in FIG. 10 using the conventional electric motor assembling method described in Patent Document 1, when the rotor 80 having a pre-magnetized magnet is to be incorporated into the stator 70, It is very difficult to obtain the same degree of coaxiality with respect to the inner diameter of the stator winding by the magnetic force of the magnet. For this reason, centering is performed between the inner diameter of the stator 70 and the outer diameter of the rotor 80 with a gap gauge having the same number as the number of slots of the stator in the circumferential direction and arranged at equal intervals. The assembly is done above. Here, since the outer periphery of the rotor 80 is a perfect circle as shown in FIG. 10, the front side and the back side of each gap gauge 90 are in contact with the stator 70 and the rotor 80, and the rotor 80 is centered. The frictional resistance when pulling out the gap gauge 90 is increased.

  Therefore, normally, the circumferential width of each gap gauge 90 is narrowed. On the other hand, when the outer periphery of the rotor 80 is not a perfect circle, there is a problem that it is difficult to accurately obtain the coaxiality of the rotor 80.

The present invention has been made in view of the above, and incorporates a rotor via a gap gauge so that the stator and the rotor are evenly spaced, and the gap gauge is easily detached and assembled. It is an object of the present invention to obtain a gap gauge used for assembling an electric motor capable of achieving the above and a method for manufacturing the electric motor.

In order to solve the above-described problems and achieve the object, the present invention provides a fixing in which a winding is wound for each of a plurality of teeth portions protruding radially from the inner peripheral side of the annular yoke portion toward the center. A gap gauge used for assembling an electric motor having a rotor and a rotor arranged to be rotatable at a predetermined interval on an inner peripheral side of the stator, and an inner peripheral side tip surface of each tooth portion is The rotor is radially opposed to the outer peripheral surface of the rotor, and the rotor is a magnet-embedded rotor in which a plurality of magnets are embedded, and the outer diameter side of the magnet is used as a magnetic pole portion, and between the magnets When the outer diameter side is the pole portion, an arc of radius R is provided on the outer periphery of the magnetic pole portion, a notch portion is provided on the outer periphery of the pole portion, and a protrusion portion extending from the notch portion to the outer diameter side; The distance between the apex of the protrusion and the center of the rotor is R, and the circle Of the circumferential end portion, circumferential length L _R of the protrusion, the configured smaller than the circumferential length L _S of the inner peripheral side leading end surface of the teeth, the teeth of the stator When the number is 3n, the number of magnetic poles of the rotor is 2n, and (n is an integer of 1 or more), the gap gauge has a plurality of gauge pieces along the inner circumference of the teeth portion of the stator. The circumferential length of each gauge piece has a length corresponding to the circumferential length L _S of the inner peripheral side tip surface of the teeth portion of the stator of the electric motor. Then, by inserting the rotor into the stator of the electric motor in a state where the gauge pieces are arranged for each inner peripheral side tip surface of the teeth portion, a gap between the stator and the rotor is obtained. and features that you adjust.

Further, the present invention provides a stator in which a winding is wound for each of a plurality of teeth portions projecting radially from the inner peripheral side of the annular yoke portion toward the center, and a predetermined number on the inner peripheral side of the stator. A method of manufacturing an electric motor having a rotor rotatably arranged at an interval, wherein an inner peripheral side front end surface of each of the teeth portions is opposed to an outer peripheral surface of the rotor in a radial direction, and the rotation The rotor is a magnet-embedded rotor in which a plurality of magnets are embedded, and when the outer diameter side of the magnet is a magnetic pole portion and the outer diameter side between the magnets is an interpole portion, An arc having a radius R is provided on the outer periphery, a notch is provided on the outer periphery of the inter-electrode portion, and a protrusion extending from the notch to the outer diameter side. The apex of the protrusion and the center of the rotor distance is R, and the circular arc of the circumferential edge, the circumferential length L _R of the protrusion, the teeth Inner with less composed than the circumferential length L _S of the circumferential side distal end surface, the circumferential length of the circular arc is smaller configuration than the circumferential length L _S of the inner peripheral side leading end surface of the teeth part When the number of the teeth portions of the stator is 3n, the number of the magnetic poles of the rotor is 2n, and (n is an integer of 1 or more) the same number of gap gauge gauges as the number of the teeth portions An arrangement step of arranging a piece on the inner peripheral side of the teeth portion, a part of the gauge piece is opposed to an arc of the magnetic pole portion of the rotor, and the remaining gauge piece of the gauge piece is an arc of the arc. A positioning step for determining the position of the rotor with respect to the gap gauge so as to oppose both the circumferential end and the protrusion; and the rotor positioned with respect to the stator via the gap gauge. Insert step to insert, A fixing step for fixing the position of the rotor by making the gap between the stator and the rotor uniform via a gap gauge, and the gap gauge inserted between the stator and the rotor And a removing step of removing the motor from the electric motor .

Further, the present invention is characterized in that a corner portion of the tip end portion of the protruding portion is formed in a curve.

  According to the present invention, the rotor can be incorporated via the gap gauge so that the stator and the rotor are evenly spaced, and the gap gauge can be easily detached and assembled.

FIG. 1 is a cross-sectional view showing an outer peripheral shape of a rotor of an electric motor according to the present invention. FIG. 2 is a cross-sectional view showing a state in which the rotor of FIG. 1 is inserted through a gap gauge on the inner peripheral side of the stator of the electric motor according to the present invention. FIG. 3 is a cross-sectional view showing a location where the gap gauge of FIG. 2 is in contact with both the stator and the rotor. FIG. 4 is an enlarged cross-sectional view showing the outer peripheral shape of the protrusion formed at the inter-electrode portion of the rotor of FIG. FIG. 5 is a plan view of a gap gauge used for assembling the electric motor according to the present invention. FIG. 6 is a front view of a gap gauge used for assembling the electric motor according to the present invention. FIG. 7 is a perspective view of a gap gauge used for assembling the electric motor according to the present invention. FIG. 8 is a flowchart showing a flow of an electric motor assembling method according to the present invention. FIG. 9 is a cross-sectional view showing a portion where the gap gauge is in contact with both the stator and the rotor in the electric motor when n = 2. FIG. 10 is a cross-sectional view showing a state in which a rotor is inserted via a gap gauge on the inner peripheral side of a stator of a conventional electric motor.

Embodiments of a gap gauge used for assembling an electric motor according to the present invention and a method for manufacturing the electric motor will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

  FIG. 1 is a cross-sectional view showing the outer peripheral shape of the rotor of the electric motor according to the present invention, and FIG. 2 shows the rotor of FIG. 1 on the inner peripheral side of the stator of the electric motor according to the present invention via a gap gauge. 3 is a cross-sectional view showing the inserted state, FIG. 3 is a cross-sectional view showing a location where the gap gauge of FIG. 2 is in contact with both the stator and the rotor, and FIG. 4 is a cross-sectional view of the rotor of FIG. It is an expanded sectional view which shows the outer periphery shape of the projection part formed in a space | interval part.

  As shown in FIG. 1, the rotor 20 of the electric motor of Example 1 is formed in a cylindrical shape by laminating a number of thin silicon steel plates (magnetic bodies), and is arranged at 60 ° intervals near the outer periphery. The rivets 31 are integrated. A rotating shaft 21 is inserted and fixed at the center of the rotor 20.

  The six plate-like permanent magnets 22 are embedded in magnet embedding holes 32 that are annularly formed at predetermined intervals near the outer periphery of the rotor 20 so as to form hexagonal sides around the rotation shaft 21. It is. An outer peripheral iron core 23 is formed on the outer peripheral side of the magnet embedding hole 32 (permanent magnet 22) of the rotor 20, and this is referred to as a magnetic pole part 26. Further, flux barriers (air gaps) 24 extending toward the outer periphery of the rotor 20 are formed at both ends in the circumferential direction of the magnet embedding hole 32 of the rotor 20 as nonmagnetic portions for preventing a short circuit of magnetic flux, This is referred to as a gap portion 25.

  A reinforcing rib portion 33 is formed between two adjacent flux barriers 24 formed on the rotor 20. On the outer peripheral side of the flux barrier 24 formed on the rotor 20 (between a notch 30 and a flux barrier 24 described later), a bridge portion 34 that connects the outer peripheral iron core 23 and the reinforcing rib portion 33. (See FIG. 4) is formed. The bridge portion 34 is formed to be as narrow as possible (for example, about the plate thickness of the stacked steel plates) within a range that does not hinder processing so that magnetic saturation does not easily pass through the magnetic flux.

Here, as shown in FIG. 1, the outer peripheral shape of the rotor 20 of the electric motor according to the first embodiment is characterized by an arc 28 having a radius R on the outer periphery of the magnetic pole portion 26 and an apex and rotor on the outer periphery of the interpolar portion 25. A protrusion 27 having a distance R from the center of 20 is provided, and a notch 30 is provided between the arc 28 and the protrusion 27. The distance between the bottom surface of the notch 30 and the center of the rotor 20 is Rs. In the first embodiment, two notches 30 are provided between the arc 28 and the protrusion 27, and the distance between the apex and the center of the rotor 20 is smaller than R between the two notches 30. It has. The auxiliary protrusion 29 is preferably formed in order to reduce the cogging torque of the electric motor and to reduce vibration noise (torque ripple).

In this embodiment, an angle (magnetic pole angle θ _M ) formed by two virtual line segments connecting both ends of the arc 28 having the radius R and the center of the rotor 20 is formed in a range of 28 to 34 °. In addition, an angle (auxiliary protrusion angle θs) formed by two virtual lines connecting the auxiliary protrusion 29 adjacent to the arc 28 and the center of the rotor 20 is formed in the range of 38.6 to 46.6 °. doing. Further, where the circumferential length of up to circumferential ends of the circular arc 28 adjacent the projections 27 and L _R.

  As shown in FIG. 2, the stator 10 of the electric motor according to the first embodiment includes nine pole teeth portions 12 that protrude radially from the inner peripheral side of the annular yoke portion 11 toward the center at intervals of 40 °. Each tooth portion 12 is configured by concentrated winding of a three-phase stator winding (not shown).

The circumferential length Wg of the gauge piece 40 of the gap gauge interposed in order to make the gap between the stator 10 and the opposing rotor 20 shown in FIG. 2 uniform is the inner diameter of the nine pole teeth portion 12 of the stator 10. It has a width corresponding to the circumferential length L _S of the circumferential tip surface. This is because when the circumferential length of the inner circumference side tip surface of the 9-pole teeth 12 of the stator 10 shown in FIG. 2 was set to L _S, the circumferential direction of the arc 28 adjacent the projections 27 of Figure 1 This is related to configuring the relationship with the circumferential length L _R to the end so that L _R <L _S. That is, as shown in FIG. 2, the gap pieces 40 arranged on the inner peripheral end surface of each tooth portion 12 are in contact with the entire surface of the arc 28, and the protrusions 27 and the arc 28 In order to keep the distance between the stator 10 and the rotor 20 uniform by contacting at two points, the circumferential length of each gauge piece 40 of the gap gauge is sometimes the case. This is because Wg needs to have a length corresponding to the circumferential length L _S of the inner peripheral side tip surface of the tooth portion 12.

  Further, as shown in FIG. 2, the circumferential width (slot opening opening width) of the frontage provided between the adjacent tooth portions 12 is represented by Ws, and the circumferential width Wg of the gauge piece 40 of the gap gauge. The relationship is such that Wg ≧ Ws.

  Further, in the electric motor constituted by the yoke portion 11 in which the three-phase stator winding is concentratedly wound on the teeth portion 12, the gauge of the gap gauge disposed on the inner peripheral side front end surface of each tooth portion 12 in FIG. In order to create a positional relationship between the piece 40 in contact with the entire surface of the arc 28 of the rotor 20 and two points of the protrusion 27 and the circumferential end of the arc 28, When the number of teeth portions 12 is 3n, the number of magnetic poles of the rotor 20 needs to be 2n (n is an arbitrary integer of 1 or more).

The outer peripheral shape of the protrusion 27 of the first embodiment, as shown in FIG. 4, the tip of the protrusion 27 circumferentially width is a, the notch 30 formed on both sides of the protrusion 27 When the circumferential width is b, it is formed so that 1 ≦ b / a ≦ 3.4. FIG. 4 shows a case where b / a≈2.4. Here, the reason why the circumferential width b of the notch 30 is formed larger than the circumferential width a of the tip is that when the electric motor is incorporated in a rotary compressor or the like and used in a high-speed rotation region, the rotor 20 gives a strong centrifugal force to the lubricating oil, and the lubricating oil is pushed into and retained in the gaps and windings of the stator 10 to prevent the oil level of the lubricating oil from falling and the rotary compressor from becoming poorly lubricated, This is so as not to give a strong centrifugal force. Since the corner from the protrusion 27 through the notch 30 to the next notch 30 from the auxiliary protrusion 29 and the corner of the tip are formed in a curve here, the rotor 20 During the rotation, the lubricating oil becomes difficult to be stirred by the protrusion 27, and a strong centrifugal force can be prevented from being applied to the lubricating oil.

  When assembling the electric motor of Example 1 configured as described above, as shown in FIG. 2, a gauge of a gap gauge having substantially the same circumferential width as the inner peripheral side front end surface of each tooth portion 12 of the stator 10. A piece 40 is arranged for each tooth portion 12, a part of the gauge piece is opposed to the arc 28 of the magnetic pole part 26 of the rotor 20, and the remaining gauge piece is on both the circumferential end of the arc 28 and the protrusion 27. The position of the rotor 20 is determined so as to face each other, and the rotor 20 is inserted from the axial direction of the rotating shaft 21 through the gauge piece 40 of the gap gauge.

  FIG. 2 is a cross-sectional view after the rotor 20 is inserted into the stator 10 through the gauge piece 40 of the gap gauge. In the first embodiment, since the outer peripheral shape of the rotor 20 is uneven, the contact area of the gauge piece 40 that contacts both the stator 10 and the rotor 20 is smaller than the area of the gauge piece 40 itself. . Looking at FIG. 3 in which the portion of the gauge piece 40 sandwiched between both the stator 10 and the rotor 20 is shown as a black solid, 3 of the gauge pieces 40 arranged in the nine-pole tooth portion 12. For one gauge piece 40, the entire gauge piece is sandwiched between the stator 10 and the rotor 20, but for the other six gauge pieces 40, two points of the circumferential end of the arc 28 and the protrusion 27 are provided. It is sandwiched between, but not between.

  Thus, according to the electric motor of Example 1, the gauge piece 40 of the gap gauge which has the substantially same circumferential direction length with respect to the inner peripheral side front end surface of each teeth part 12 of the stator 10 is arrange | positioned, and the gauge By inserting the rotor 20 into the inner diameter side of the stator 10 via the piece 40, the arc piece 28 always having the radius R of the rotor 20 or the circumferential end portion of the arc piece 28 with respect to each gauge piece 40. It is possible to make contact at two points of the protrusion 27. For this reason, the interval between the stator 10 and the rotor 20 can be made uniform so that the assembly can be performed with high accuracy, and an electric motor that is less likely to be warped due to the eccentricity of the rotor 20 can be obtained.

  Further, according to the electric motor of the first embodiment, even if the circumferential length Wg of the gap gauge 41 is long, the contact area of the gauge piece 40 is smaller than the area of the gauge piece 40 itself (see FIG. 3). The frictional resistance when pulling out the piece 40 does not increase so much, and the gauge piece 40 can be pulled out from the electric motor without damaging it.

  Further, according to the electric motor of the first embodiment, the outer periphery of the rotor 20 is formed with the arc 28 having the radius R and the protrusion 27, the notch 30 is provided around the arc 28, and the adjacent notch 30. By providing the auxiliary protrusion 29 between the two, it is possible to prevent the reduction of the rotational torque of the electric motor and to obtain the effect of reducing the cogging torque and the torque ripple.

  FIG. 5 is a plan view of a gap gauge used for assembling the electric motor according to the present invention, FIG. 6 is a front view of the gap gauge used for assembling the electric motor according to the present invention, and FIG. It is a perspective view of the gap gauge used for the assembly of the electric motor concerning.

  As shown in FIGS. 5 to 7, the electric motor assembly according to the second embodiment is composed of a plurality of gauge pieces 40 for ensuring a uniform distance between the outer periphery of the rotor and the inner periphery of the stator. A gap gauge 41 is used. The gap gauge 41 is formed by fixing one end of a plurality of elongated rectangular gauge pieces 40 to the side surface of a cylindrical base while shifting the circumferential direction at regular intervals. As shown in FIGS. 6 and 7, each gauge piece 40 of the gap gauge 41 is angled so as to open outward as it goes to the tip. Accordingly, the position of the gap gauge 41 inserted on the inner peripheral side of the stator 10 shown in FIG. 2 is adjusted so that each gauge piece 40 comes to the inner peripheral side tip surface of each tooth portion 12, and is opened outward. By inserting the rotor 20 from the distal end side of the gauge piece 40, the rotor 20 is maintained in a state where the space between the stator 10 and the rotor 20 is kept uniformly at an interval corresponding to the thickness of the gauge piece 40. Can be incorporated into the stator 10.

The feature of the gauge piece 40 of the gap gauge 41 according to the second embodiment is that the width of each gauge piece is substantially equivalent to the circumferential width L _S of the inner peripheral side tip surface of the teeth portion 12 of the stator 10 of the electric motor to be assembled. It has a width Wg and is configured to correspond to the number and position of the tooth portions 12. As described in the first embodiment, this is because the outer peripheral shape of the rotor 20 incorporated in the stator 10 is formed with an arc 28 having a radius R and a protrusion 27 at the magnetic pole portion 26 and the inter-pole portion 25 in FIG. A notch 30 is formed between the two. Then, when the number of teeth 12 of the stator 10 is 3n, the number of magnetic poles of the rotor 20 is 2n. Thus, when the position of the arc 28 of the rotor 20 is aligned with an arbitrary tooth portion 12 of the stator 10, as shown in FIG. 2, the arc 28 and the arc 28 via the gauge piece 40 of the teeth portion 12 at regular intervals. However, in the tooth portion 12 in the middle, there are locations where the protrusion 27 and the circumferential end of the arc 28 are in contact with each other via the gauge piece 40. As conditions in this case, as described in the first embodiment, the circumferential width L _S (see FIG. 2) of the inner peripheral side tip surface of the tooth portion 12 of the stator 10 and the protrusion portion 27 of the rotor 20 are further included. relationship between the circumferential distance to the circumferential ends of the circular arc 28 adjacent the L _{R (see} FIG. 1) is required to have an L _{R <L S.}

As described above, when the stator 10 and the rotor 20 are configured under the conditions of the first embodiment, the circumferential width substantially corresponding to the circumferential width L _S of the inner circumferential front end surface of the teeth portion 12 of the stator 10. It is necessary to use a gap gauge 41 composed of a gauge piece 40 having Wg.

  According to the gap gauge 41 of the second embodiment, when used for assembling the electric motor of the first embodiment, the arc piece 28 always having the radius R of the rotor 20 or the circumferential direction of the arc piece 28 with respect to each gauge piece 40. It is possible to make contact at the two points of the end and the protrusion 27. For this reason, since the interval between the stator 10 and the rotor 20 can be made uniform and the assembly can be performed with high accuracy, an electric motor that is unlikely to be twisted due to the eccentricity of the rotor 20 can be obtained.

  Even when the circumferential length Wg of the gap gauge 41 of Example 2 is long, the contact area of the gauge piece 40 is smaller than the area of the gauge piece 40 itself (see FIG. 3). The frictional resistance does not increase so much and can be pulled out from the electric motor without damaging the gauge piece 40.

FIG. 8 is a flowchart showing a flow of an electric motor assembling method according to the present invention. A method of assembling the electric motor according to the third embodiment will be described with reference to FIG. As shown in FIG. 8, the same number of gauge pieces 40 of the gap gauge 41 as the number of teeth of the stator 10 of the electric motor are arranged on the inner peripheral side of each tooth portion 12 (step S100). Here, as shown in FIG. 2, when the number of teeth of the stator 10 is 9 poles (3n) and the number of poles of the magnet-embedded rotor 20 is 6 poles (2n), the gap gauge 41 used therefor As the gauge piece 40, nine pieces having the same number as the number of teeth are used (see FIGS. 5 to 7). As shown in FIG. 5, the arrangement of the gauge pieces 40 of the gap gauge 41 corresponds to the circumferential position of the teeth portion 12 of the stator 10 in FIG. 2. Also, the circumferential width Wg of the gauge strip 40, as shown in FIG. 2, has a width corresponding to the circumferential width L _S of the inner peripheral side leading end surface of the teeth portions 12 of the stator 10. The gap gauge 41 is inserted into the inner peripheral side of the teeth portion 12 of the stator 10 in FIG. 2 and arranged so that each gauge piece 41 comes to the inner peripheral side front end surface of each tooth portion 12.

  Subsequently, the gap is such that a part of the gauge piece 40 faces the arc 28 of the magnetic pole portion 26 of the rotor 20 and the remaining gauge piece 40 faces both the circumferential end of the arc 28 and the protrusion 27. The position of the rotor 20 to be assembled with the gauge 41 is determined (step S101). That is, as shown in FIG. 2, the gauge piece 40 having the gap gauge 41 disposed on the inner peripheral side tip surface of the tooth portion 12 is rotated so as to face the arc 28 of the magnetic pole portion 26 of the rotor 20. When the position of the child 20 is determined, the position of the rotor 20 facing the remaining gauge piece 40 is also determined.

  Subsequently, the rotor 20 positioned via the gap gauge 41 is inserted into the stator 10 (step S102). Specifically, as shown in FIG. 2, the positioning is performed so that the arc 28 of the magnetic pole portion 26 of the rotor 20 comes to the gauge piece 40 of the tooth portion 12 positioned in the 12 o'clock direction of the stator 10. In the next gauge piece 40 in the clockwise direction, the protrusion 27 and the circumferential end of the arc 28 face each other, and in the next gauge piece 40, the circumferential end of the arc 28 and the protrusion 27 face each other. The next gauge piece 40 faces only the arc 28 of the magnetic pole part 26 of the rotor 20. Subsequent gauge pieces 40 are repeated in this order. By arranging as shown in FIG. 2, the stator 10 and the rotor 20 are configured to face each gauge piece 40 on the entire surface or at least at two points. And the rotor 20 can be made uniform, and the rotor 20 can be assembled to the stator 10 with high accuracy.

  As described above, the gap between the stator 10 and the rotor 20 is made uniform via the gap gauge 41, and after centering, the position of the rotor 20 is fixed (step S103). Specifically, the bearings (not shown) of the stator 10 and the rotor 20 are fixed to the casing of the electric motor in the centered state. Thereby, the positions of the stator 10 and the rotor 20 are determined.

  Finally, the gap gauge 41 inserted between the stator 10 and the rotor 20 is pulled out and removed from the electric motor (step S104). Thereby, the assembly of the rotor 20 to the stator 10 is completed. As shown in FIG. 9, the pulling operation of the gap gauge has been conventionally sandwiched between the stator 10 and the rotor 20 in the entire circumferential width of the gauge piece 70 of the gap gauge. On the other hand, the frictional resistance was large, and the gap gauge could be damaged if it was forcibly pulled out. In contrast, by adopting the structure of the stator 10 and the rotor 20 according to the first embodiment and using the gap gauge 41 according to the second embodiment, the circumferential width of the gauge piece 40 of the gap gauge of FIG. Thus, the number of places actually sandwiched between the stator 10 and the rotor 20 is reduced as shown in FIG. 3, and the frictional resistance can be reduced with respect to the strength of the gauge piece 40. As a result, in the method of assembling the electric motor according to the third embodiment, the gap gauge 41 can be prevented from being damaged when the gap gauge 41 sandwiched between the stator 10 and the rotor 20 is pulled out.

  According to the method of assembling the electric motor of the third embodiment described above, the rotor 20 is incorporated via the gap gauge so that the stator 10 and the rotor 20 are evenly spaced, and after the rotor 20 is fixed, the gap gauge 41 can be easily removed and assembled.

  In the first to third embodiments, the number of teeth of the stator 10 is 9 poles (3n), and the number of poles of the embedded magnet type rotor 20 is 6 poles (2n) (n = 3). Although described using the present invention, the present invention is not limited to this. For example, in the case of an electric motor of n = 2, as shown in FIG. 9, 6-pole teeth portions 52 project radially from the inner peripheral side of the annular yoke portion 51 of the stator 50 toward the center at 60 ° intervals. The three-phase stator windings (not shown) are concentratedly wound around each of the teeth portions 52.

  The rotor 60 inserted on the inner peripheral side of the teeth portion 52 of the stator 50 has a rotor 60 such that four plate-like permanent magnets 62 form each side of a quadrangle with the rotation shaft 61 as the center. Are embedded in magnet embedding holes that are annularly formed at predetermined intervals. An outer peripheral iron core 63 is formed on the outer peripheral side of the permanent magnet 62 of the rotor 60. This is called a magnetic pole part, and an arc of radius R (corresponding to the arc 28 in FIG. 1) is formed on the outer periphery of the magnetic pole part. ing. In addition, flux barriers (air gaps) 64 extending toward the outer periphery of the rotor 60 are formed at both ends in the circumferential direction of the permanent magnet 62 of the rotor 60 as non-magnetic portions for preventing a short circuit of magnetic flux. Is called an inter-electrode portion, and a protrusion (corresponding to the protrusion 27 in FIG. 1) whose distance between the apex and the center of the rotor 60 is R is formed on the outer periphery of the inter-electrode portion. And two notch parts (equivalent to the notch part 30 of FIG. 1) are formed between the circular arc and the projecting part, and an auxiliary projecting part (an auxiliary prosthesis of FIG. 1) having an outer diameter smaller than that of the projecting part therebetween. (Corresponding to the protrusion 29).

  As described above, even in the case of the motor of n = 2, it is exactly the same as the case of n = 3 described above, and the inner circumference of the tooth portion 52 in which the circumferential length of the gauge piece of the gap gauge is 6 poles. If the width corresponds to the circumferential length of the side tip surface, as shown in FIG. 9, the gauge piece abuts on the entire surface between the tooth portion 52 and the outer arc of the magnetic pole portion, and the tooth portion 52. This is a pattern in the case where the gauge piece abuts at two points between the protrusion and the circumferential end of the arc. This is the same even when n = 1 or n = 4 or more, and the contact area of the gauge piece is smaller than the area of the gauge piece itself (see FIG. 9). The frictional resistance does not increase so much and can be pulled out of the motor without damaging the gauge piece.

As described above, the gap gauge used for assembling the electric motor and the method for manufacturing the electric motor according to the present invention easily assemble the rotor with respect to the stator at uniform intervals, and the gap gauge is attached after fixing the rotor. The present invention is useful as a gap gauge used for assembling an electric motor that can be incorporated in a rotary compressor or the like that is detached and assembled, and a method for manufacturing the electric motor.

DESCRIPTION OF SYMBOLS 10 Stator 11 Yoke part 12 Teeth part 20 Rotor 21 Rotor shaft 22 Permanent magnet 23 Outer peripheral part iron core 24 Flux barrier (gap)
25 Pole part 26 Magnetic pole part 27 Projection part 28 Arc 29 Auxiliary projection part 30 Notch part 31 Rivet 32 Magnet embedding hole 33 Reinforcement rib part 34 Bridge part 40 Gauge piece 41 Gap gauge

Claims (3)

A stator in which a winding is wound for each of a plurality of tooth portions projecting radially from the inner peripheral side of the annular yoke portion toward the center, and is rotatable at a predetermined interval on the inner peripheral side of the stator A gap gauge used for assembling an electric motor having a rotor arranged in
The inner peripheral side tip surface of each of the teeth portions is opposed to the outer peripheral surface of the rotor in the radial direction,
The rotor is a magnet-embedded rotor in which a plurality of magnets are embedded, and when the outer diameter side of the magnet is a magnetic pole part and the outer diameter side between the magnets is an interpole part,
An arc having a radius R is provided on the outer periphery of the magnetic pole portion,
The outer periphery of the interpolar part comprises a notch part and a protrusion part extending from the notch part to the outer diameter side, and the distance between the apex of the protrusion part and the center of the rotor is R,
And the circular arc of the circumferential edge, the circumferential length L _R of the protrusion, is made smaller than the circumferential length L _S of the inner peripheral side leading end surface of the teeth,
When the number of the teeth portions of the stator is 3n, the number of magnetic poles of the rotor is 2n, and (n is an integer of 1 or more)
The gap gauge is
A plurality of gauge pieces can be arranged in an arc shape along the inner circumference of the teeth portion of the stator, and the circumferential length of each gauge piece is the inner circumference of the teeth portion of the stator of the electric motor. A length corresponding to the circumferential length L _S of the side tip surface;
The gap between the stator and the rotor is adjusted by incorporating the rotor into the stator of the electric motor in a state where the gauge pieces are arranged for each inner peripheral side tip surface of the teeth portion. Gap gauge used for assembling electric motors. A stator in which a winding is wound for each of a plurality of tooth portions projecting radially from the inner peripheral side of the annular yoke portion toward the center, and is rotatable at a predetermined interval on the inner peripheral side of the stator A method of manufacturing an electric motor having a rotor arranged in
The motor is
The inner peripheral side tip surface of each of the teeth portions is opposed to the outer peripheral surface of the rotor in the radial direction,
The rotor is a magnet-embedded rotor in which a plurality of magnets are embedded, and when the outer diameter side of the magnet is a magnetic pole part and the outer diameter side between the magnets is an interpole part,
An arc having a radius R is provided on the outer periphery of the magnetic pole portion,
The outer periphery of the interpolar part comprises a notch part and a protrusion part extending from the notch part to the outer diameter side, and the distance between the apex of the protrusion part and the center of the rotor is R,
And the circular arc of the circumferential edge, the circumferential length L _R of the protrusion, with smaller constructed than the circumferential length L _S of the inner peripheral side leading end surface of the teeth, the circumferential of the arc The direction length is configured to be smaller than the circumferential length L _S of the inner peripheral side distal end surface of the teeth portion ,
When the number of the teeth portions of the stator is 3n, the number of magnetic poles of the rotor is 2n, and (n is an integer of 1 or more)
An arrangement step of arranging the same number of gap gauge gauge pieces as the number of teeth portions on the inner peripheral side of the teeth portions;
A part of the gauge piece is opposed to the arc of the magnetic pole portion of the rotor, and the remaining gauge piece of the gauge piece is opposed to both the circumferential end of the arc and the protrusion. A positioning step for determining the position of the rotor with respect to the gap gauge;
An insertion step of inserting the rotor positioned via the gap gauge with respect to the stator;
A fixing step of uniforming a distance between the stator and the rotor via the gap gauge and fixing a position of the rotor;
A removal step of removing the gap gauge inserted between the stator and the rotor from the electric motor;
Method for producing a motor, characterized in that it contains. The method for manufacturing an electric motor according to claim 2, wherein a corner of the tip of the protrusion is formed in a curved shape.

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