JP6354227B2 - Magnet fixing method of rotating electric machine, jig for fixing magnet, rotating electric machine - Google Patents

Description

  The present invention relates to a magnet fixing method for a rotating electric machine, a magnet fixing jig, and a rotating electric machine.

  Conventionally, an outer rotor type rotation including a bottomed cylindrical rotor housing and a plurality of magnets provided along the inner peripheral surface of the rotor housing and fixed to the inner peripheral surface of the rotor housing with an adhesive An electric machine is known (see, for example, Patent Documents 1 and 2). In such a conventional rotating electrical machine, a plurality of magnets are pressed against the inner peripheral surface of the rotor housing to fix the plurality of magnets to the inner peripheral surface of the rotor housing.

JP 2003-259611 A JP 2005-20892 A

  However, when the plurality of magnets are pressed against the inner peripheral surface of the rotor housing and the plurality of magnets are fixed to the rotor housing, for example, when the roundness accuracy on the inner peripheral surface of the rotor housing or the outer surface of the magnet member is low, The accuracy of the perfect circle on the inner surface of the magnet may be reduced, and the magnetic balance may be lost and abnormal noise may be generated.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a magnet fixing method for a rotating electrical machine, a magnet fixing jig, and a rotating electrical machine that can suppress the occurrence of abnormal noise by improving the magnetic balance.

In order to solve the above-mentioned problem, the magnet fixing method for a rotating electrical machine according to claim 1 is characterized in that an inner surface of a plurality of arc-shaped magnets constituting a magnet member is formed on an outer peripheral surface having a circular cross section formed on a core member. In a state of contact, the slide member is slidable in the radial direction of the core member and the slide member is locked to both end portions of the outer surface of each magnet. A holding step of holding the plurality of magnets against the core member by pressing each magnet against the outer peripheral surface of the core member by sliding, and holding the plurality of magnets against the core member In this state, the inner peripheral surface of the cylindrical rotor housing and the outer surface of the magnet member are opposed to each other through a gap, and the outer surface of the magnet member is connected to the rotor through an adhesive interposed in the gap. housing And a, a bonding step of bonding the inner peripheral surface.

  According to the magnet fixing method of the rotating electrical machine, the outer surface of the magnet member is in a state (positioned state) in which the inner surfaces of the plurality of arc-shaped magnets are in contact with the outer peripheral surface having a circular cross section formed on the core member. And the outer peripheral surface of the magnet member is bonded to the inner peripheral surface of the rotor housing through an adhesive interposed in the gap. Therefore, even when the roundness accuracy on the inner peripheral surface of the rotor housing and the outer surface of the magnet member is low, the decrease in accuracy can be absorbed by the gap (adhesive). Thereby, the influence which the roundness accuracy in the inner peripheral surface of a rotor housing and the outer surface of a magnet member has on the roundness accuracy in the inner surface of a plurality of magnets can be eliminated.

  In addition, if a core member with high roundness accuracy (the outer peripheral surface is close to a perfect circle) is used, the roundness accuracy on the inner surfaces of the plurality of magnets can be ensured. Thereby, since magnetic balance can be improved, generation | occurrence | production of abnormal noise can be suppressed.

Further , according to the magnet fixing method of the rotating electrical machine, when holding a plurality of magnets against the core member, each magnet is pressed against the outer peripheral surface of the core member, so that the inner surface of each magnet is the outer periphery of the core member. The surface can be imitated. Thereby, the perfect circle accuracy in the inner surface of a plurality of magnets can be improved more.

Furthermore, according to the magnet fixing method of the rotating electrical machine, each magnet can be pressed against the outer peripheral surface of the core member by sliding the slide member inward in the radial direction of the core member. The workability at the time of holding can be improved.

The magnet fixing method for the rotating electrical machine according to claim 2 is the magnet fixing method for the rotating electrical machine according to claim 1 , wherein the core member and the plurality of the plurality of core members are slid by sliding the slide member radially outward of the core member. It is the method further provided with the cancellation | release process which cancels | releases a holding | maintenance state with a magnet.

  According to the magnet fixing method of the rotating electric machine, the holding state between the core member and the plurality of magnets is released by sliding the slide member to the outside in the radial direction of the core member, so the rotor housing and the rotor having the plurality of magnets Can be easily removed from the core member.

The magnet fixing method for a rotating electrical machine according to claim 3 is the magnet fixing method for the rotating electrical machine according to claim 1 or 2 , wherein the plurality of magnets, the plurality of magnets, and It is a method further comprising a molding step of forming the magnet member having an integrated mold resin.

  According to the magnet fixing method of the rotating electrical machine, the magnet member having the plurality of magnets and the mold resin integrated with the plurality of magnets is formed in the molding step before the holding step. Therefore, the magnet member having a plurality of magnets can be held on the core member at a time in the holding step. Thereby, for example, a plurality of magnets are separately provided on the core member as compared with a case where a magnet member constituted only by a plurality of magnets is held on the core member (when a plurality of magnets are separately held on the core member). Since the holding jig is unnecessary, the cost can be reduced and the workability in the holding process can be improved.

According to a fourth aspect of the present invention, there is provided a method for fixing a magnet of a rotating electric machine, wherein the inner surface of the plurality of magnets is formed on a core metal of a mold in the molding step of the method of fixing a magnet of a rotating electric machine according to a third aspect. In this method, the plurality of magnets are set in the mold in a state of being in contact with the outer peripheral surface having a circular cross section.

  According to the magnet fixing method of the rotating electrical machine, in the molding step, the inner surfaces of the plurality of magnets are brought into contact with the outer peripheral surface having a circular cross section formed on the core metal of the mold. Therefore, if a core bar with high roundness accuracy (the outer peripheral surface is close to a perfect circle) is used, the roundness accuracy on the inner side surfaces of the plurality of magnets can be ensured.

The magnet fixing method for a rotating electrical machine according to claim 5 is a positioning portion formed on the magnet member and the core in the holding step in the magnet fixing method for a rotating electrical machine according to claim 3 or 4. This is a method of positioning the magnet member in the circumferential direction with respect to the core member by engaging with a positioning portion formed on the member.

  According to the magnet fixing method of the rotating electric machine, in the holding step, the positioned portion formed on the magnet member and the positioning portion formed on the core member are engaged with each other so that the magnet member is surrounded with respect to the core member. Position in the direction. As a result, in the bonding step after the holding step, the outer surface of the magnet member can be bonded to the inner peripheral surface of the rotor housing in a state where the displacement of the magnet member in the circumferential direction with respect to the core member is suppressed.

A magnet fixing method for a rotating electrical machine according to claim 6 is formed on an outer surface of the magnet member in the bonding step in the magnet fixing method for a rotating electrical machine according to any one of claims 3 to 5. A plurality of protrusions are fitted to the inner peripheral surface of the rotor housing, and the magnet member is press-fitted inside the rotor housing.

  According to the magnet fixing method of the rotating electrical machine, in the bonding process, the plurality of protrusions formed on the outer surface of the magnet member are fitted to the inner peripheral surface of the rotor housing, and the magnet member is press-fitted inside the rotor housing. . Accordingly, for example, the magnet member can be firmly fixed to the rotor housing as compared with the case where the outer surface of the magnet member is fixed to the inner peripheral surface of the rotor housing only by the adhesive.

In order to solve the above-mentioned problem, the magnet fixing jig according to claim 7 includes a core member having an outer peripheral surface having a circular cross section and inner surfaces of a plurality of arc-shaped magnets constituting the magnet member. A holding mechanism for holding the plurality of magnets against the core member by pressing the magnets against the outer peripheral surface of the core member in a state of being in contact with the outer peripheral surface of the core member. The mechanism includes a slide member that is slidable in a radial direction of the core member, a locking portion that is provided on the slide member and is engaged with both ends of the outer surface of each magnet, and the slide member is connected to the core member. And a biasing member that biases the inner side in the radial direction.

  According to this magnet fixing jig, for example, a plurality of magnets can be fixed to the inner peripheral surface of the rotor housing in the following manner. That is, first, the magnet member is held with respect to the core member in a state in which the inner surfaces of the plurality of arc-shaped magnets constituting the magnet member are in contact with the outer peripheral surface having a circular cross section formed on the core member (holding step). ). Next, in a state where the magnet member is held with respect to the core member, the inner peripheral surface of the cylindrical rotor housing and the outer surface of the magnet member are opposed to each other via a gap, and an adhesive interposed in the gap is used. The outer surface of the magnet member is bonded to the inner peripheral surface of the rotor housing (bonding process).

  Here, according to the magnet fixing method using the magnet fixing jig, as described above, the inner surfaces of the plurality of arc-shaped magnets are in contact with the outer peripheral surface of the circular cross section formed on the core member (positioning). In this state, the outer peripheral surface of the magnet member is opposed to the outer peripheral surface of the magnet member via a gap, and the outer peripheral surface of the magnet member is made to face the inner peripheral surface of the rotor housing via an adhesive interposed in the gap. Glue. Therefore, even when the roundness accuracy on the inner peripheral surface of the rotor housing and the outer surface of the magnet member is low, the decrease in accuracy can be absorbed by the gap (adhesive). Thereby, the influence which the roundness accuracy in the inner peripheral surface of a rotor housing and the outer surface of a magnet member has on the roundness accuracy in the inner surface of a plurality of magnets can be eliminated.

  In addition, if a core member with high roundness accuracy (the outer peripheral surface is close to a perfect circle) is used, the roundness accuracy on the inner surfaces of the plurality of magnets can be ensured. Thereby, since magnetic balance can be improved, generation | occurrence | production of abnormal noise can be suppressed.

Further , according to this magnet fixing jig, when holding a plurality of magnets against the core member, each magnet is pressed against the outer peripheral surface of the core member by the holding mechanism, so that the inner surface of each magnet is It is possible to follow the outer peripheral surface of the member. Thereby, the perfect circle accuracy in the inner surface of a plurality of magnets can be improved more.

Furthermore, according to the magnet fixing jig, the slide member is calibrated by the biasing force of the biasing member in a state where the locking portions provided on the slide member are locked at both ends of the outer surface of the magnet. Slide inward. Thereby, since each magnet can be pressed to the outer peripheral surface of a core member, the workability | operativity at the time of holding a magnet with respect to a core member can be improved.

The magnet fixing jig according to claim 8 is the magnet fixing jig according to claim 7 , wherein the holding mechanism further includes a rotating cam, and the rotating cam contacts the slide member, A contact surface that slides the slide member radially outward of the core member against the biasing force of the biasing member, and the slide member slides radially inward of the core member by the biasing force of the biasing member. And a flank face to be configured.

  According to this magnet fixing jig, as the rotary cam rotates, the state is switched between a state in which the slide member is slid radially inward of the core member and a state in which the slide member is slid radially outward of the core member. be able to. Since the holding state of the core member and the plurality of magnets can be released by sliding the slide member outward in the radial direction of the core member, the rotor housing and the rotor having the plurality of magnets can be easily removed from the core member. Can be removed.

It is side surface sectional drawing of the rotary electric machine which concerns on 1st embodiment. It is a figure which shows the magnet shown by FIG. 1, Comprising: (A) is a front view, (B) is a top view. It is a figure which shows the jig for magnet fixation which concerns on 1st embodiment, Comprising: (A) is a top view when a holding mechanism exists in a cancellation | release state, (B) is a longitudinal cross-sectional view of (A). It is a figure which shows the jig for magnet fixation which concerns on 1st embodiment, Comprising: (A) is a top view when a holding mechanism exists in a holding state, (B) is a longitudinal cross-sectional view of (A). It is a figure which shows the state which has made the several magnet adhere to the internal peripheral surface of a rotor housing in 1st embodiment. (A) is a figure which shows the measurement result of the roundness about the inner surface of the several magnet in a prior art, (B) shows the measurement result of the roundness about the inner surface of the several magnet in 1st embodiment. FIG. It is a top view which shows the state which set the some magnet to the metal mold | die which concerns on 2nd embodiment. It is a longitudinal cross-sectional view of FIG. 7A. It is a top view which shows the state which integrally shape | molded mold resin to the several magnet with the metal mold | die which concerns on 2nd embodiment. It is a longitudinal cross-sectional view of FIG. 8A. It is a figure which shows the magnet member which concerns on 2nd embodiment, Comprising: (A) is a top view, (B) is a longitudinal cross-sectional view. It is a figure which shows the state which has made the magnet member adhere to the internal peripheral surface of a rotor housing in 2nd embodiment.

[First embodiment]
First, a first embodiment of the present invention will be described.

  A rotating electrical machine 10 shown in FIG. 1 is a brushless motor, and includes a motor housing 12, an end housing 14, and a motor body 16 as main components.

  The motor housing 12 and the end housing 14 are assembled together, and a motor main body 16 is accommodated therein. The motor body 16 includes a stator 18, a rotor 20, a rotating shaft member 22, a center piece 24, and a plurality of vibration isolation members 26.

  The stator 18 has a stator core 28 and a plurality of stator coils 30. The stator core 28 has a plurality of radially formed tooth portions 32, and the plurality of stator coils 30 are wound around the plurality of tooth portions 32, respectively.

  The rotor 20 includes a rotor housing 34 and a plurality of magnets 36. The rotor housing 34 is formed in a bottomed cylindrical shape having a bottom portion 38 and a tubular portion 40. A cylindrical fitting portion 42 is formed at the center of the bottom portion 38 of the rotor housing 34. The fitting portion 42 is fitted with the central portion in the longitudinal direction of the rotary shaft member 22, whereby the rotor 20 is rotated integrally with the rotary shaft member 22. The rotary shaft member 22 is rotatably supported by a pair of bearings 44 and 46 provided on the center piece 24.

  As shown in FIG. 2, the magnet 36 is formed in an arc shape. Both ends of the outer surface 36A of the magnet 36 are formed as locked surfaces 36B. As shown in FIG. 1, each magnet 36 is provided along the inner peripheral surface 34 </ b> A of the rotor housing 34, and is fixed to the inner peripheral surface 34 </ b> A of the rotor housing 34 with an adhesive 48.

  The plurality of magnets 36 are arranged at intervals in the circumferential direction, and are arranged to face the stator 18 on the radially inner side with respect to the stator 18 described above. The plurality of magnets 36 constitutes an annular magnet member 50 (in the first embodiment, the magnet member 50 is configured only by the plurality of magnets 36). In this brushless motor, when a rotating magnetic field is generated in the stator 18, the rotor 20 is rotated by an attractive force and a repulsive force acting between the stator 18 and the magnet 36.

  Next, a magnet fixing jig for fixing a magnet to the inner peripheral surface of the rotor housing will be described.

  As shown in FIG. 3, the magnet fixing jig 60 in the first embodiment includes a shaft 62, a rotor receiver 64, a core member 66, a holding mechanism 68, and a base 70.

  The shaft 62 has the same diameter as that of the rotary shaft member 22 (see FIG. 1). The shaft 62 extends upward from a center portion of a core member 66 described later. The rotor receiver 64 is formed in a columnar shape and is arranged coaxially with the shaft 62. The upper portion 64 </ b> A of the rotor receiver 64 protrudes upward from the core member 66. When the rotor housing 34 is set on the magnet fixing jig 60 (see FIG. 5) as described later, the upper portion 64A of the rotor receiver 64 is arranged so as to come into contact with the central portion of the bottom portion 38 of the rotor housing 34. Dimensions, shape, etc. are set.

  As an example, the core member 66 is formed in a cylindrical shape (inverted bottomed cylindrical shape) having a closing portion 72 and a cylindrical portion 74. The core member 66 has an outer peripheral surface 66A having a circular cross section, and a stepped portion 76 is formed on the outer peripheral surface 66A over the entire periphery. A magnet 36 can be placed on the stepped portion 76 as will be described later. An outer peripheral surface 66 </ b> A of the core member 66 is formed concentrically with the shaft 62.

  The outer peripheral surface 66A of the core member 66 has the same radius of curvature as the inner peripheral surface 36C of each magnet 36, and is formed closer to a perfect circle. The roundness accuracy of the outer peripheral surface 66A of the core member 66 is such that the roundness accuracy of the inner circumferential surface 34A of the rotor housing 34 and the outer side surfaces 36A of the plurality of magnets 36 (when the rotor 20 is assembled as shown in FIG. It is set higher than the accuracy of the perfect circle on the outer surface of the magnet member 50. The perfect circle accuracy in this case is the degree of perfect circle, which is how close to a perfect circle, and depends on dimensional accuracy at the time of processing, cylindricity, squareness, and the like.

  Further, a positioning projection 78 is provided on the closing portion 72 of the core member 66 at a position shifted from the center of the core member 66. The positioning projection 78 extends upward from the closing portion 72 of the core member 66.

  The holding mechanism 68 includes a plurality of slide members 80, a plurality of coil springs 82 that are examples of urging members, and a rotating cam 84. The plurality of slide members 80 are provided at equal intervals in the circumferential direction of the core member 66. Each slide member 80 is inserted into a hole 86 formed in the cylindrical portion 74 of the core member 66 and is slidable in the radial direction of the core member 66.

  A locking portion 88 is formed at one end of the slide member 80 (on the side opposite to the rotating cam 84 described later). The locking portion 88 is formed by expanding one end portion of the slide member 80. Further, the locking portion 88 is formed in a tapered shape so as to increase in diameter toward the one end side of the slide member 80 (outside in the radial direction of the core member 66).

  The coil spring 82 is supported on the other end side of the slide member 80. A stopper portion 90 is provided on the other end side of the slide member 80, and the coil spring 82 is provided between the stopper portion 90 and the inner peripheral surface 66 </ b> B of the core member 66.

  The rotating cam 84 is disposed inside the core member 66 and is provided coaxially with the shaft 62 described above. The rotating cam 84 is rotatably supported by the rotor receiver 64 described above. On the outer circumferential surface of the rotating cam 84, contact surfaces 92 and flank surfaces 94 are alternately formed in the circumferential direction of the rotating cam 84. The flank 94 has a shorter distance from the center of the rotating cam 84 than the contact surface 92.

  In the magnet fixing jig 60, as shown in FIG. 3, when the other end of the slide member 80 comes into contact with the contact surface 92, the slide member 80 resists the biasing force of the coil spring 82. The member 66 can be slid outward in the radial direction. On the other hand, as shown in FIG. 4, when the rotary cam 84 is rotated and the flank 94 is located at a position facing the other end of the slide member 80, the other end of the slide member 80 is separated from the flank 94. The slide member 80 is slid radially inward of the core member 66 by the urging force of the coil spring 82.

  Next, a magnet fixing method using the above-described magnet fixing jig will be described.

  First, as shown in FIGS. 3A and 3B, the rotating cam 84 is rotated to bring the contact surface 92 into contact with the other end of the slide member 80. When the contact surface 92 contacts the other end of the slide member 80, the slide member 80 is slid outward in the radial direction of the core member 66 against the biasing force of the coil spring 82. In this state, the plurality of magnets 36 are placed on the stepped portion 76 formed on the outer peripheral surface 66 </ b> A of the core member 66, and the inner surface 36 </ b> C of the plurality of arc-shaped magnets 36 is formed on the core member 66. It contacts with the circular outer peripheral surface 66A. At this time, each slide member 80 is arranged between the plurality of magnets 36.

  Then, as shown in FIGS. 4A and 4B, the rotary cam 84 is rotated so that the flank 94 is positioned at a position facing the other end of the slide member 80. When the flank 94 faces the other end of the slide member 80, the other end of the slide member 80 is separated from the flank 94, and the slide member 80 is slid radially inward of the core member 66 by the biasing force of the coil spring 82. . As a result, the slide member 80 is slid inwardly in the radial direction of the core member 66 in a state where the locking portion 88 is locked to both end portions (the locked surface 36B in FIG. 2) of the outer surface 36A of the magnet 36. And each magnet 36 is hold | maintained with respect to the core member 66 in the state pressed by the outer peripheral surface 66A of the core member 66 (above, holding process).

  Subsequently, as shown in FIG. 5, the bottomed cylindrical rotor housing 34 is mounted on the magnet fixing jig 60 from above, and the inner peripheral surface 34 </ b> A of the rotor housing 34 and the outer surfaces 36 </ b> A of the plurality of magnets 36. Are opposed to each other through a gap 96. Further, the positioning protrusion 78 is inserted into a positioning hole (not shown) formed in the rotor housing 34 to position the rotor housing 34 in the circumferential direction.

  Before attaching the rotor housing 34 to the magnet fixing jig 60, an adhesive 48 is applied in advance to at least one of the inner peripheral surface 34A of the rotor housing 34 and the outer surfaces 36A of the plurality of magnets 36. . Then, the outer surface 36 A of the plurality of magnets 36 is bonded to the inner peripheral surface 34 A of the rotor housing 34 via the adhesive 48 interposed in the gap 96 in a state where the rotor housing 34 is mounted on the magnet fixing jig 60. (End of adhesion process). The adhesive 48 used in this case is preferably an adhesive that can suppress a decrease in the adhesive strength even when the film thickness is increased. A suitable example of the adhesive 48 is a two-component acrylic adhesive.

  Then, after the adhesive 48 is cured, the rotary cam 84 is rotated to bring the contact surface 92 into contact with the other end of the slide member 80 and slide the slide member 80 radially outward of the core member 66 (see FIG. 3). ). Thereby, the holding state of the magnet 36 by the holding mechanism 68 is released (the releasing step). Then, the rotor 20 having the rotor housing 34 and the plurality of magnets 36 shown in FIG. 5 is moved upward and removed from the magnet fixing jig.

  In the first embodiment, the rotor 20 is assembled in the manner described above. As described above, since the roundness accuracy of the outer peripheral surface 66A of the core member 66 is high, the inner surfaces 36C of the plurality of magnets 36 are arranged with high roundness accuracy in the rotor 20 assembled as described above. Further, the inner peripheral surface 34A of the rotor housing 34 and the outer surface 36A of the plurality of magnets 36 have lower roundness accuracy than the inner surface 36C of the plurality of magnets 36, but the adhesive 48 is used for the inner peripheral surface of the rotor housing 34. The thickness changes in the circumferential direction corresponding to the variation in the distance between 34 </ b> A and the outer surface 36 </ b> A of the plurality of magnets 36. The adhesive 48 (gap 96) absorbs the reduced circular accuracy of the inner peripheral surface 34A of the rotor housing 34 and the outer surface 36A of the plurality of magnets 36.

  The plurality of magnets 36 may be magnetized before being assembled to the rotor housing 34, or may be magnetized after being assembled to the rotor housing 34. Further, the holding release of the rotor 20 by the holding mechanism 68 may be performed in a half-thirst state before the adhesive 48 is completely solidified as long as the magnet 36 does not move from the rotor housing 34.

  Next, operations and effects in the first embodiment of the present invention will be described.

  As described above in detail, according to the magnet fixing method according to the first embodiment, the inner side surfaces 36 </ b> C of the plurality of arc-shaped magnets 36 are brought into contact with the outer peripheral surface 66 </ b> A having a circular cross section formed in the core member 66. In the state (positioned state), the outer peripheral surface 36A of the plurality of magnets 36 is opposed to the inner peripheral surface 34A of the rotor housing 34 through the gap 96, and a plurality of adhesives 48 are interposed through the adhesive 48 interposed in the gap 96. The outer surface 36A of the magnet 36 is bonded to the inner peripheral surface 34A of the rotor housing 34. Therefore, even when the accuracy of the perfect circle on the inner peripheral surface 34A of the rotor housing 34 and the outer surface 36A of the plurality of magnets 36 is low, the decrease in accuracy can be absorbed by the gap 96 (adhesive 48). Thereby, the influence of the roundness accuracy on the inner circumferential surface 34A of the rotor housing 34 and the outer side surface 36A of the plurality of magnets 36 on the roundness accuracy on the inner surface 36C of the plurality of magnets 36 can be eliminated.

  In addition, since the core member 66 having high roundness accuracy is used and the inner side surfaces 36C of the plurality of magnets 36 are copied to the outer peripheral surface 66A of the core member 66, the roundness accuracy on the inner side surfaces 36C of the plurality of magnets 36 is increased. Can be secured. Thereby, since magnetic balance can be improved, generation | occurrence | production of abnormal noise can be suppressed.

  Further, when holding the plurality of magnets 36 against the core member 66, each magnet 36 is pressed against the outer peripheral surface 66 </ b> A of the core member 66, so that the inner side surface 36 </ b> C of each magnet 36 is moved by the outer peripheral surface 66 </ b> A of the core member 66. Can be imitated. Thereby, the roundness accuracy on the inner side surface 36 </ b> C of the plurality of magnets 36 can be further improved.

  Further, as the rotary cam 84 rotates, the slide member 80 can be switched between a state in which the slide member 80 is slid radially inward of the core member 66 and a state in which the slide member 80 is slid radially outward of the core member 66. . Then, by sliding the slide member 80 inward in the radial direction of the core member 66, each magnet 36 can be pressed against the outer peripheral surface 66 </ b> A of the core member 66, and therefore when holding the magnet 36 against the core member 66. The workability can be improved.

  Further, the sliding state of the core member 66 and the plurality of magnets 36 can be released by sliding the slide member 80 radially outward of the core member 66, so that the rotor having the rotor housing 34 and the plurality of magnets 36 is achieved. 20 can be easily removed from the core member 66.

  Here, FIG. 6 shows a comparison of roundness between the related art and the first embodiment with respect to the roundness accuracy on the inner side surface 36 </ b> C of the plurality of magnets 36. FIG. 6A shows the measurement result of the roundness of the inner surfaces of the plurality of magnets 36 in the prior art, and FIG. 6B shows the plurality of magnets 36 in the first embodiment. The measurement result of roundness for the inner surface is shown. The roundness in this case is “the magnitude of the deviation from the geometrically correct circle of the circular shape” as defined in JIS B 0621-1984. 6A and 6B, the vertical axis represents the roundness, and the horizontal axis represents the circumferential positions of the plurality of magnets.

  In the prior art, a plurality of magnets are pressed against the inner peripheral surface of the rotor housing to fix the plurality of magnets to the inner peripheral surface of the rotor housing. In this case, “the circularity accuracy of the inner peripheral surface of the rotor housing is low”, “the coaxiality of the inner peripheral surface of the rotor housing is large”, “the circularity accuracy of the inner surface of the plurality of magnets is low”, etc. For this reason, as shown in FIG. 6 (A), the magnetism of “increase in step X between inner surfaces of adjacent magnets”, “variation in pitch Y between adjacent magnets”, and “increase in magnet tilt Z”. Factors that have a large impact on balance will deteriorate. As a result, the magnetic balance may be lost and abnormal noise may occur.

  On the other hand, according to the first embodiment, as shown in FIG. 6B, the above-described factors having a large influence on the magnetic balance are improved, so that the magnetic balance becomes good. Thereby, generation | occurrence | production of unusual noise can be suppressed.

  Next, a modification of the first embodiment of the present invention will be described.

  In the first embodiment, the holding mechanism 68 has a plurality of slide members 80, a plurality of coil springs 82, and a rotating cam 84, but presses each magnet 36 against the outer peripheral surface 66 </ b> A of the core member 66. As long as the structure can hold the plurality of magnets 36 with respect to the core member 66, other configurations may be used.

  Further, the holding mechanism 68 has the coil spring 82 as an example of the urging member, but may be other members as long as the member can urge the slide member 80 radially inward of the core member 66.

[Second Embodiment]
Next, a second embodiment of the present invention will be described.

  The second embodiment differs from the first embodiment described above in the configuration of the magnet member 50 and the magnet fixing method of the rotating electrical machine.

  In other words, in the magnet fixing method for a rotating electrical machine according to the second embodiment, first, as shown in FIGS. 7A and 7B, molding is performed using the mold 100. In FIG. 7A, the movable mold 104 and the fixed plate 116 shown in FIG. 7B are omitted. The same applies to FIG. 8A.

  The mold 100 has a fixed mold 102 and a movable mold 104. The fixed mold 102 is placed on the base 106. The fixed mold 102 is formed in a concave shape, and a metal core 108 is accommodated inside the fixed mold 102. The cored bar 108 has an outer peripheral surface 108A having a circular cross section, and a magnet member 50 described later is formed between the outer peripheral surface 108A of the cored bar 108 and the inner peripheral surface 102A of the fixed mold 102. The space 110 (cavity) is formed.

  The roundness accuracy of the outer circumferential surface 108A of the cored bar 108 is the roundness accuracy of the inner circumferential surface 34A of the rotor housing 34 and the trueness of the outer surface (outer circumferential surface) 50A of the magnet member 50 when the rotor 20 is assembled as will be described later. It is set higher than the circular accuracy. On the inner peripheral surface 102A of the fixed mold 102, a recess 112 for forming a protrusion 54 on the outer surface 50A of the magnet member 50 described later is formed.

  The fixed mold 102 is provided with a columnar first column 114 extending to the side opposite to the base 106 side, and a fixed plate 116 is fixed to the tip of the first column 114. The movable mold 104 is guided by the first column 114 and is movable (movable up and down) between the fixed mold 102 and the fixed plate 116. In addition, a second column 118 is integrally provided on the movable mold 104, and the second column 118 is slidably supported on the fixed plate 116.

  A plurality of positioning pins 120 are provided on the peripheral wall portion of the fixed mold 102. The plurality of positioning pins 120 can slide in the radial direction with respect to the peripheral wall portion of the fixed mold 102. Further, a plurality of knockout pins 122 are provided on the bottom of the fixed mold 102 and the fixed plate 116. The plurality of knockout pins 122 can slide in the height direction with respect to the fixed mold 102 and the fixed plate 116.

  In molding using the mold 100, first, as shown in FIGS. 7A and 7B, a plurality of magnets 36 are set in the mold 100 (accommodated in the space 110). At this time, the inner side surfaces 36C of the plurality of magnets 36 are brought into contact with the outer peripheral surface 108A of the cored bar 108. Further, the plurality of positioning pins 120 are slid inward in the radial direction of the fixed mold 102. As a result, the distal end portion of the positioning pin 120 is locked to both end portions of the outer surface 36A of the magnet 36, and each magnet 36 is held against the core metal 108 while being pressed against the outer peripheral surface 108A of the core metal 108. .

  Then, as described above, molten resin is injected into the space 110 in a state where each magnet 36 is held against the cored bar 108. Further, by solidifying the molten resin, as shown in FIGS. 8A and 8B, a magnet member 50 having a plurality of magnets 36 and a mold resin 52 integrated with the plurality of magnets 36 is formed. The After the magnet member 50 is formed, as shown in FIG. 8B, the movable mold 104 is raised and the knockout pin 122 is raised to remove the magnet member 50 from the fixed mold 102.

  The magnet member 50 thus formed by molding is formed in an annular shape as shown in FIGS. 9 (A) and 9 (B). The inner surfaces 36C of the plurality of magnets 36 are exposed on the inner diameter side of the magnet member 50, and the outer surfaces 36A of the plurality of magnets 36 are covered with the mold resin 52. Further, the outer surface 50A (outer peripheral surface) of the magnet member 50 is formed of a mold resin 52, and a plurality of protrusions 54 extending in the axial direction of the magnet member 50 are formed on the outer surface 50A. Are formed at intervals in the circumferential direction (the molding process).

  Subsequently, as shown in FIG. 10, a magnet fixing jig 60 is used. The magnet fixing jig 60 according to the second embodiment has a configuration in which the holding mechanism 68 (see FIGS. 3 and 4) is omitted from the magnet fixing jig 60 according to the first embodiment. Then, using this magnet fixing jig 60, the magnet member 50 is placed on the stepped portion 76 formed on the outer peripheral surface 66A of the core member 66, and the inner side surfaces 36C of the plurality of arc-shaped magnets 36 are connected to the core member. The outer peripheral surface 66 </ b> A having a circular cross section formed on 66 is brought into contact. The inner diameter of the magnet member 50 and the outer diameter of the core member 66 are substantially the same size, and the magnet member 50 is held against the core member 66 by lightly press-fitting the core member 66 inside the magnet member 50. Is done.

  At this time, the magnetized member 50 is positioned in the circumferential direction with respect to the core member 66 by engaging the positioned portion 56 formed on the magnet member 50 and the positioning portion 124 formed on the core member 66. . The positioned portion 56 (see also FIG. 9A) is formed by a hole extending in the axial direction of the magnet member 50, and the positioning portion 124 is formed by a pin extending in the axial direction of the core member 66. The positioned portion 56 may be formed in the above-described molding process, or may be formed by additional machining after the molding process (the holding process).

  Subsequently, as shown in FIG. 10, the bottomed cylindrical rotor housing 34 is mounted on the magnet fixing jig 60 from above, and the inner peripheral surface 34 </ b> A of the rotor housing 34 and the outer surface 50 </ b> A of the magnet member 50 are connected. Opposing through the gap 96. Further, the positioning protrusion 78 is inserted into a positioning hole (not shown) formed in the rotor housing 34 to position the rotor housing 34 in the circumferential direction.

  In this way, when the rotor housing 34 is mounted on the magnet fixing jig 60, the plurality of protrusions 54 (see FIG. 9) formed on the outer surface 50 </ b> A of the magnet member 50 are arranged on the inner peripheral surface of the rotor housing 34. The magnet member 50 is press-fitted inside the rotor housing 34 by being fitted to the 34A. In this case, the press-fitting is a light press-fitting that does not affect the roundness accuracy of the inner surface 36 </ b> C of the plurality of magnets 36.

  Before attaching the rotor housing 34 to the magnet fixing jig 60, an adhesive 48 is applied in advance to at least one of the inner peripheral surface 34A of the rotor housing 34 and the outer surface 50A of the magnet member 50. Then, the outer surface 50A of the magnet member 50 is bonded to the inner peripheral surface 34A of the rotor housing 34 through the adhesive 48 interposed in the gap 96 in a state where the rotor housing 34 is mounted on the magnet fixing jig 60 ( Above, bonding process).

  After the adhesive 48 is cured, the rotor 20 having the rotor housing 34 and the magnet member 50 is moved upward and removed from the magnet fixing jig 60.

  In the second embodiment, the rotor 20 is assembled in the manner described above. As described above, since the roundness accuracy of the outer peripheral surface 66A of the core member 66 is high, the inner surfaces 36C of the plurality of magnets 36 are arranged with high roundness accuracy in the rotor 20 assembled as described above. Further, the inner circumferential surface 34A of the rotor housing 34 and the outer surface 50A of the magnet member 50 have a lower roundness accuracy than the inner surface 36C of the plurality of magnets 36, but the adhesive 48 is used for the inner circumferential surface 34A of the rotor housing 34. And the outer surface 50A of the magnet member 50, the thickness changes in the circumferential direction corresponding to the variation in the distance. The adhesive 48 (gap 96) absorbs the reduced circular accuracy of the inner peripheral surface 34 </ b> A of the rotor housing 34 and the outer surface 50 </ b> A of the magnet member 50.

  Next, operations and effects in the second embodiment of the present invention will be described.

  As described above in detail, according to the magnet fixing method according to the second embodiment, the inner side surfaces 36 </ b> C of the plurality of arc-shaped magnets 36 are brought into contact with the outer peripheral surface 66 </ b> A having a circular cross section formed on the core member 66. In the state (positioned state), the outer peripheral surface 50 </ b> A of the magnet member 50 is opposed to the inner peripheral surface 34 </ b> A of the rotor housing 34 via the gap 96, and the magnet member 50 is interposed via the adhesive 48 interposed in the gap 96. The outer surface 50 </ b> A is bonded to the inner peripheral surface 34 </ b> A of the rotor housing 34. Therefore, even when the accuracy of the perfect circle on the inner peripheral surface 34A of the rotor housing 34 and the outer surface 50A of the magnet member 50 is low, a decrease in these accuracy can be absorbed by the gap 96 (adhesive 48). Thereby, it is possible to eliminate the influence of the roundness accuracy on the inner circumferential surface 34A of the rotor housing 34 and the outer side surface 50A of the magnet member 50 on the roundness accuracy on the inner side surfaces 36C of the plurality of magnets 36.

  In addition, since the core member 66 having high roundness accuracy is used and the inner side surfaces 36C of the plurality of magnets 36 are copied to the outer peripheral surface 66A of the core member 66, the roundness accuracy on the inner side surfaces 36C of the plurality of magnets 36 is increased. Can be secured. Thereby, since magnetic balance can be improved, generation | occurrence | production of abnormal noise can be suppressed.

  Further, when the magnet member 50 is held against the core member 66, the core member 66 is lightly press-fitted inside the magnet member 50, so that the inner side surface 36C of each magnet 36 is caused to follow the outer peripheral surface 66A of the core member 66. Can. Thereby, the roundness accuracy on the inner side surface 36 </ b> C of the plurality of magnets 36 can be further improved.

  Further, in the molding step before the holding step, the magnet member 50 having the plurality of magnets 36 and the mold resin 52 integrated with the plurality of magnets 36 is formed. Therefore, the magnet member 50 having the plurality of magnets 36 can be held on the core member 66 at a time in the holding step. Thereby, for example, compared with the case where the magnet member 50 constituted only by the plurality of magnets 36 is held by the core member 66 (when the plurality of magnets 36 are separately held by the core member 66), the plurality of magnets 36 is obtained. The cost can be reduced and workability in the holding process can be improved because the jig for separately holding the core member 66 on the core member 66 is unnecessary.

  In the molding process, the inner side surfaces 36C of the plurality of magnets 36 are brought into contact with the outer peripheral surface having a circular cross section formed on the cored bar 108 of the mold 100. Therefore, if the core metal 108 with high roundness accuracy (the outer peripheral surface is close to a perfect circle) is used, the roundness accuracy on the inner side surfaces 36 </ b> C of the plurality of magnets 36 can be ensured.

  In particular, in this molding process, a plurality of positioning pins 120 are slid inward in the radial direction of the fixed mold 102 so that the tip ends of the slide pins are engaged with both ends of the outer surface of the magnet, and each magnet is a core member. The core metal 108 is held while being pressed against the outer peripheral surface 66. Thereby, since the inner surface of each magnet can be made to follow by the outer peripheral surface 108A of the cored bar 108, the roundness accuracy on the inner surfaces 36C of the plurality of magnets 36 can be further improved.

  Moreover, the magnet member 50 formed in this molding process has a plurality of magnets 36 and a mold resin 52 as described above. Therefore, compared with the case where all the magnet members 50 are formed of magnets, the cost can be reduced by the amount of the mold resin 52.

  In the holding step, the magnetized member 50 is positioned in the circumferential direction with respect to the core member 66 by engaging the positioned portion 56 formed on the magnet member 50 and the positioning portion 124 formed on the core member 66. To do. Thus, in the bonding step after the holding step, the outer surface 50A of the magnet member 50 is bonded to the inner peripheral surface of the rotor housing in a state in which the displacement of the magnet member 50 in the circumferential direction with respect to the core member 66 is suppressed. Can do.

  Further, in the bonding step, the plurality of protrusions 54 formed on the outer surface 50A of the magnet member 50 are fitted to the inner peripheral surface of the rotor housing, and the magnet member 50 is press-fitted inside the rotor housing. Thereby, for example, the magnet member 50 can be firmly fixed to the rotor housing as compared with the case where the outer surface 50A of the magnet member 50 is fixed to the inner peripheral surface of the rotor housing only by the adhesive.

  Next, a modification of the second embodiment of the present invention will be described.

  In the second embodiment, the outer surface 50 </ b> A (outer peripheral surface) of the magnet member 50 is formed by the mold resin 52, but may be formed by outer surfaces of the plurality of magnets 36. That is, the outer surfaces of the plurality of magnets 36 may be exposed to the radially outer side of the magnet member 50 without being covered with the mold resin 52.

  In the second embodiment, the magnet fixing jig 60 does not include the holding mechanism 68, but may include the holding mechanism 68. Further, when the magnet fixing jig 60 includes the holding mechanism 68, for example, a hole into which the slide member 80 can be inserted is formed in the mold resin 52 of the magnet member 50, and the slide member 80 of the core member 66 is formed through this hole. It may be slid in the radial direction. Then, similarly to the first embodiment, a holding step of holding a plurality of magnets using the slide member 80 and a releasing step of releasing the holding state of the core member 66 and the plurality of magnets 36 by the slide member 80 are performed. Also good.

  The embodiment of the present invention has been described above, but the present invention is not limited to the above, and it is needless to say that various modifications can be made without departing from the scope of the present invention. It is.

DESCRIPTION OF SYMBOLS 10 ... Rotating electrical machine, 12 ... Motor housing, 14 ... End housing, 16 ... Motor body, 18 ... Stator, 20 ... Rotor, 22 ... Rotating shaft member, 24 ... Center piece, 26 ... Vibration isolator, 28 ... Stator core, 30 ... stator coil, 32 ... teeth part, 34 ... rotor housing, 34A ... inner peripheral surface, 36 ... magnet, 36A ... outer side face, 36B ... locked surface, 36C ... inner side face, 38 ... bottom part, 40 ... cylindrical part , 42 ... fitting part, 44, 46 ... bearing, 48 ... adhesive, 50 ... magnet member, 50A ... outer surface, 52 ... mold resin, 54 ... projection, 56 ... positioning part, 60 ... jig for magnet fixation 62 ... Shaft, 64 ... Rotor receiver, 64A ... Upper part, 66 ... Core member, 66A ... Outer peripheral surface, 66B ... Inner peripheral surface, 68 ... Holding mechanism, 70 ... Base, 72 ... Closure part, 74 ... Cylindrical part, 76 ... Difference part 78 ... Positioning projection 80 ... Slide member 82 ... Coil spring (an example of a biasing member) 84 ... Rotating cam 86 ... Hole part 88 ... Locking part 90 ... Stopper part 92 ... Contact Surface, 94 ... Flank, 96 ... Gap, 100 ... Mold, 102 ... Fixed mold, 104 ... Movable mold, 106 ... Base, 108 ... Core metal, 108A ... Outer peripheral surface, 110 ... Space, 112 ... Recess, 114 ... 1st column 116 ... fixed plate 118 ... 2nd column 120 ... positioning pin 122 ... knockout pin 124 ... positioning part

Claims (8)

A locking portion of a slide member that is slidable in the radial direction of the core member in a state where inner surfaces of a plurality of arc-shaped magnets constituting the magnet member are in contact with an outer peripheral surface having a circular cross section formed on the core member. By pressing the magnets against the outer peripheral surface of the core member by sliding the slide member inward in the radial direction of the core member in a state where the magnet is engaged with both ends of the outer surface of the magnet, A holding step of holding a plurality of magnets with respect to the core member ;
With the plurality of magnets held against the core member, the inner peripheral surface of the cylindrical rotor housing and the outer surface of the magnet member are opposed to each other through a gap, and the adhesive is interposed in the gap. Bonding step of bonding the outer surface of the magnet member to the inner peripheral surface of the rotor housing via
A method for fixing a magnet of a rotating electrical machine comprising: A release step of releasing the holding state of the core member and the plurality of magnets by sliding the slide member radially outward of the core member;
The magnet fixing method for a rotating electrical machine according to claim 1 . Before the holding step, further comprising a mold forming step of forming the magnet member having the plurality of magnets and a mold resin integrated with the plurality of magnets,
The magnet fixing method for a rotating electrical machine according to claim 1 or 2 . In the molding step, the plurality of magnets are set in the mold and molded while the inner surfaces of the plurality of magnets are in contact with the outer peripheral surface having a circular cross section formed on the core metal of the mold. ,
The magnet fixing method of the rotary electric machine according to claim 3 . In the holding step, the positioned portion formed on the magnet member and the positioning portion formed on the core member are engaged to position the magnet member in the circumferential direction with respect to the core member.
The magnet fixing method for a rotating electrical machine according to claim 3 or 4 . In the bonding step, a plurality of protrusions formed on the outer surface of the magnet member are fitted to the inner peripheral surface of the rotor housing, and the magnet member is press-fitted into the rotor housing.
The magnet fixing method for a rotating electrical machine according to any one of claims 3 to 5 . A core member having an outer peripheral surface having a circular cross section;
By pressing the magnets against the outer peripheral surface of the core member in a state where the inner surfaces of the plurality of arc-shaped magnets constituting the magnet member are in contact with the outer peripheral surface of the core member, the plurality of magnets are moved to the core A holding mechanism for holding the member;
With
The holding mechanism is
A slide member slidable in the radial direction of the core member;
A locking portion provided on the slide member and locked to both ends of the outer surface of each magnet,
A biasing member that biases the slide member radially inward of the core member;
have,
Magnet fixing jig . The holding mechanism further includes a rotating cam;
The rotating cam is in contact with the slide member, and a contact surface that slides the slide member outward in the radial direction of the core member against the biasing force of the biasing member, and the biasing force of the biasing member And a flank that slides the slide member radially inward of the core member,
The magnet fixing jig according to claim 7 .

Images