JP2010081776A - Rotor of synchronous motor, and method of manufacturing the same rotor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotor of a synchronous motor that reduces vibration and noise. <P>SOLUTION: The rotor 100 of the synchronous motor has a first magnetic material member 2 which is formed of a material containing a soft magnetic powder and has a function of a back yoke, permanent magnets 1 disposed in the outside of the magnetic material member 2, and a second magnetic material member 3 disposed in the outer periphery of each permanent magnet 1 and consisting of a member containing the soft magnetic powder. The area of the second magnetic material member 3 is made large in the vicinity of the center of each magnetic pole constituted by each permanent magnet 1, and is made small in the vicinity of each space between the magnetic poles. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a rotor of a synchronous motor using permanent magnets. The present invention also relates to a method for manufacturing a rotor of a synchronous motor.

  A synchronous motor using a rotor in which a permanent magnet is disposed in an iron core can increase the torque of the motor by using reluctance torque using a magnetic part on the outer periphery of the rotor. On the other hand, the direction of the magnetic flux generated from the permanent magnet disposed inside easily changes in the magnetic body portion on the outer periphery. Therefore, the direction of the magnetic flux may change suddenly during operation depending on the positional relationship between the magnetic poles of the rotor and the teeth of the stator. As a result, noise and vibration generated from the synchronous motor may increase.

  The following technique has been proposed for this problem. That is, in order to reduce the cogging torque with a simple configuration, the permanent magnet rotor of the electric motor having the permanent magnet piece in the laminated rotor core is inserted into a rectangular parallelepiped portion formed by the permanent magnet piece opening. The permanent magnet piece is made of two types of permanent magnet materials, and is shaped to replenish the central main material skewed in the axial direction of the central main material and the substantially rectangular parallelepiped portions on both sides thereof, and has a lower magnetic flux density than the central main material A permanent magnet rotor composed of a secondary permanent magnet piece has been proposed (see, for example, Patent Document 1).

  Further, for the purpose of increasing the electric motor efficiency per volume of the permanent magnet, the tooth portion is provided in the stator, and is opposed to the rotor with a gap therebetween. The rotor is provided with a soft magnetic body having a permanent magnet embedding hole and is rotatable about a rotation axis. The soft magnetic body has holes for embedding permanent magnets along the rotation axis. Permanent magnets are embedded in the permanent magnet embedding holes. A magnetic pole face of a permanent magnet has a normal line perpendicular to the rotation axis, and a rotor having a circular shape has been proposed (see, for example, Patent Document 2).

  Also, to reduce the armature reaction magnetic flux and improve the magnetic flux distribution of the outer peripheral core, to provide a high-efficiency permanent magnet motor with less noise and vibration, center the axis in the rotor core. The permanent magnet housing holes formed in the portions corresponding to the sides of the substantially regular polygon, the permanent magnets inserted into the magnet housing holes, and the outer peripheral cores of the permanent magnet housing holes are formed in the radial direction. And four or more slit holes spaced apart along the permanent magnet receiving hole, and the pitch of the radially outer end of the slit hole is made substantially equal, and the pitch of the radially inner end is made equal to that of the permanent magnet. A permanent magnet electric motor has been proposed in which the central part is enlarged and the distance from the central part to the end part is reduced (see, for example, Patent Document 3).

Further, there has been proposed a rotor in which a permanent magnet is arranged on the rotor surface, and the permanent magnet has a substantially octagonal shape as means for suppressing vibration and noise of an electric motor. (For example, refer to Patent Document 4).
Japanese Patent Laid-Open No. 10-174324 JP 2006-14389 A JP 2005-94968 A JP-A-4-26338

  However, as in Patent Document 1 and Patent Document 2 described above, there are the following problems in making the permanent magnet inclined with respect to the rotation axis or making it circular. For example, when a permanent magnet is disposed on the surface of the rotor and directly opposed to the stator, a great effect can be obtained. However, when the permanent magnet is disposed inside the magnetic body, the permanent magnet is disposed inside the magnetic body on the surface of the permanent magnet. Since the direction of the magnetic flux is likely to change, the effect of devising the shape of the permanent magnet is smaller than when the permanent magnet is arranged on the rotor surface.

  Further, in the case of the technique described in Patent Document 3, the effect of suppressing the vibration and noise of the synchronous motor is obtained by restricting the change in the direction of the magnetic flux in the magnetic body on the rotor surface to some extent by the slit hole. be able to. However, the slit hole makes it difficult for reluctance torque to be generated, and there is a problem that the feature of the rotor in which the permanent magnet is arranged inside the rotor magnetic body cannot be used.

  In the case of the technique described in Patent Document 4, in order to dispose the permanent magnet on the rotor surface, it is necessary to make the shape of the permanent magnet into an arc shape, and the processing of the permanent magnet is costly. In the case of a bond magnet in which magnetic powder is kneaded with resin, it can be molded by a mold and can be processed relatively easily. However, since the density of magnetic powder is lowered, the characteristics are inferior to those of a sintered permanent magnet.

  This invention is made in order to solve the above subjects, and it aims at providing the manufacturing method of the rotor of a synchronous motor which can reduce a vibration and noise, and the rotor of a synchronous motor. .

The rotor of the synchronous motor according to this invention is
A first magnetic member formed of a material containing soft magnetic powder and having a function of a back yoke;
A permanent magnet disposed outside the first magnetic member;
A second magnetic member disposed on the outer periphery of the permanent magnet and made of a material containing soft magnetic powder;
The second magnetic member is characterized in that the area is large near the center of the magnetic poles of the permanent magnet and the area is small near the gap between the magnetic poles.

  In the rotor of the synchronous motor according to the present invention, the second magnetic member has a shape in which the area is large near the center of the magnetic poles constituting the permanent magnet and the area is small near the magnetic poles. The change of the interlinkage magnetic flux becomes gentle, and the torque pulsation can be suppressed and the vibration and noise of the synchronous motor can be suppressed.

Embodiment 1 FIG.
1 to 7 show the first embodiment, FIG. 1 is a perspective view of a rotor 100 of a synchronous motor, and FIG. 2 is a perspective view showing a state in which the nonmagnetic portion 4 of FIG. 1 is removed ((a)). Is a state in which the non-magnetic portion 4 of FIG. 1 is removed, and (b) is a non-magnetic portion previously formed on the mold when the magnetic members (first magnetic member 2 and second magnetic member 3) are manufactured by molding. 3 is a perspective view of a state in which the members constituting the rotor of FIG. 1 are separated from each other. FIG. 4 is a perspective view showing separately the members constituting the rotor 100 of the synchronous motor according to the modified assembly method ((a) is a state before the permanent magnet 1 and the nonmagnetic part 4 are assembled, and (b) is FIG. 5 shows a rotor 100 of a synchronous motor according to a modified example. FIG. 6 and FIG. 7 show the induced voltage waveform and cogging of the synchronous motor using the synchronous motor rotor 100 shown in FIG. A torque waveform is shown.

  The configuration of the rotor 100 of the synchronous motor will be described with reference to FIGS. In the following description, the rotor 100 of the synchronous motor may be simply referred to as “rotor”. The rotor 100 of the synchronous motor is formed of a material containing soft magnetic powder, and has a first magnetic member 2 having a function of a back yoke, and a flat plate-like shape disposed on the outer periphery of the first magnetic member 2. Permanent magnet 1, second magnetic member 3 that is disposed on the outer peripheral portion of permanent magnet 1 and made of a material containing soft magnetic powder, and second magnetic member that is disposed on the outer peripheral portion of permanent magnet 1 3 and a non-magnetic portion 4 that fills the space between the three.

  A first magnetic member 2 made of a material containing soft magnetic powder and having the function of a back yoke, and a second magnetic body arranged on the outer periphery of the permanent magnet 1 and made of a material containing soft magnetic powder The member 3 constitutes a rotor core.

  The permanent magnet 1 is disposed in the vicinity of the outer peripheral portion inside the rotor core.

  A rotation shaft fitting hole 5 into which the rotation shaft is fitted at the center is provided at the center of the first magnetic member 2 having the function of the back yoke.

  The permanent magnet 1 used in the present embodiment is a flat rectangular shape. Here, for example, four permanent magnets 1 are used. The permanent magnet 1 uses a sintered permanent magnet.

  FIG. 2A shows the rotor 100 of the synchronous motor in a state where the nonmagnetic portion 4 of FIG. 1 is removed. As can be seen, the second magnetic member 3 on the outer peripheral portion has a shape in which the four corners (both ends) of the outer portion of each permanent magnet 1 having one magnetic pole are notched in the vicinity of both ends in the axial direction. The second magnetic member 3 forms a substantially octagon with respect to one magnetic pole.

  In other words, the volume of the second magnetic member 3 is large near the center in the axial direction, and the volume gradually decreases toward both ends in the axial direction.

  For this reason, substantially triangular nonmagnetic portions 4 exist at the four corners on the outer peripheral portion of the permanent magnet 1.

  By forming the second magnetic member 3 as described above, the second magnetic member 3 on the outer periphery facing the outer peripheral surface of the permanent magnet 1 constituting each one magnetic pole has an area near the center of the magnetic pole. The shape is large and the area decreases between the magnetic poles.

  The nonmagnetic portion 4 on the outer periphery of the rotor 100 of the synchronous motor does not necessarily have to be filled with any nonmagnetic material, and it is not necessary to consider the influence of the rotor strength, windage loss, and the like during rotation. , Nothing may exist.

  When the rotor 100 of the synchronous motor rotates, the area of the magnetic body at the outer peripheral portion facing the teeth (not shown) of the stator is the rotation angle of the rotor in the case of a rotor that is entirely a magnetic body. Gradually increases in proportion to

  On the other hand, in the rotor 100 of the synchronous motor having the non-magnetic portion 4, the area of the second magnetic member 3 that initially faces the teeth of the stator is small with respect to the rotation angle of the rotor. The area increases gradually and gradually.

  When a magnetic body exists on the entire surface of the rotor, the magnetic flux generated from the permanent magnet 1 easily changes its direction in the outer magnetic body. Therefore, when a part of the outer periphery magnetic body starts to face the teeth of the stator during the rotation of the rotor, the magnetic flux suddenly concentrates on the facing portion having a lower magnetic resistance than the slot opening (not shown) of the stator. Therefore, the magnetic flux flowing into the teeth that have started to face each other suddenly increases. This sudden change in magnetic flux distorts the induced voltage generated in the stator windings, increasing the torque pulsation of the synchronous motor, which causes vibration and noise.

  In the synchronous motor rotor 100 according to the present embodiment, when the rotor rotates, the area where the outer peripheral second magnetic member 3 is opposed to the teeth of the stator is initially small and rotates toward the center of the magnetic pole. As the distance increases, the amount of area increase gradually increases.

  Accordingly, the sudden flow of magnetic flux into the teeth of the stator is suppressed, distortion of the induced voltage generated in the winding is reduced, torque pulsation is suppressed, and a synchronous motor with less vibration and noise can be obtained.

  In general, in the case of a rotor in which the permanent magnet 1 is disposed inside the rotor, a rotor iron core in which electromagnetic steel plates are laminated is often used, and the second magnet on the outer periphery like the rotor shown in FIG. 1 (FIG. A1). In order to configure the body member 3, the rotor 100 of the synchronous motor as shown in FIG. 1 must be realized by gradually changing the shape of punching the electromagnetic steel sheet for each electromagnetic steel sheet to be laminated.

  However, in this case, since there are many types of electromagnetic steel sheets to be punched, a large-scale mold and press equipment are required.

  On the other hand, the rotor 100 of the synchronous motor shown in the present embodiment can freely form the shape of the second magnetic member 3 by molding a material containing soft magnetic powder using a mold. .

  In this case, since the material containing soft magnetic powder has a low density of the magnetic material, the amount of magnetic flux generated by the rotor is smaller than that of an iron core formed by laminating electromagnetic steel sheets. However, as compared with a rotor in which a bonded magnet obtained by kneading magnetic powder in the aforementioned resin having a low magnetic powder density is disposed on the surface, higher magnetic force can be obtained by using the sintered permanent magnet 1.

  For example, when the rotor of the present embodiment is manufactured, as shown in FIG. 3, as a member constituting the rotor, a first magnetic member 2 having a back yoke function, a flat permanent magnet 1, a permanent A rotor can be comprised by processing and assembling the 2nd magnetic body member 3 arrange | positioned on the outer periphery of the magnet 1, respectively.

  When the members shown in FIG. 3 (first magnetic member 2, permanent magnet 1, and second magnetic member 3) are assembled, a rotor having a shape as shown in FIG. 2A is formed.

  If it is not necessary to consider the influence of the rotor strength, windage loss during rotation, etc., the above-mentioned members (first magnetic member 2, permanent magnet 1, second magnetic member 3) are bonded together. Fix it.

  Further, the non-magnetic resin material is integrally formed to fix each member (the first magnetic member 2, the permanent magnet 1, and the second magnetic member 3) and to form the non-magnetic portion 4. By doing so, the rotor can be manufactured.

  At this time, the magnetic members (first magnetic member 2 and second magnetic member 3) used for the rotor may be manufactured by injection molding of a resin material containing soft magnetic powder, or divided into each. Therefore, an iron core obtained by compressing a soft magnetic powder having a higher magnetic density and sintering and firing may be used.

  Further, since the first magnetic body member 2 having the function of the back yoke can be made relatively simple in shape, it is possible to constitute only this portion by laminating electromagnetic steel sheets.

  Also, as shown in FIGS. 4 (a) and 4 (b), the plate-shaped permanent magnet 1 and the nonmagnetic portion 4 on the outer periphery of the rotor are assembled in advance and integrated with a material containing soft magnetic powder. The rotor shown in FIG. 1 can also be manufactured by molding the first magnetic member 2 and the second magnetic member 3.

  Further, in the case of the rotor shape shown in the present embodiment, since the non-magnetic portions 4 exist at both ends in the rotation axis direction, the magnetic body members (first magnetic body member 2 and second magnetic body member 3). When a part corresponding to the non-magnetic part 4 is formed in advance in the mold, only the permanent magnet 1 is inserted, and the rotation shown in FIG. Child production is also possible.

  In the synchronous motor rotor 100 according to the present embodiment, since the second magnetic member 3 is present on the surface of the permanent magnet 1, reluctance torque can be used, thereby improving the torque of the synchronous motor. It is.

  Further, since the shape of the permanent magnet 1 can be a simple flat plate shape, the processing cost of the permanent magnet 1 can be suppressed, and an increase in cost can be suppressed even when a sintered rare earth magnet having high magnetic properties is used. .

  In the nonmagnetic portion 4 on the outer periphery of the rotor, the portion facing the nonmagnetic portion 4 of the permanent magnet 1 has a large magnetic resistance, and the generated magnetic flux is larger than that of the portion having the second magnetic member 3 on the surface. Less. For this reason, it may not necessarily be optimal from the viewpoint of cost performance.

  In this case, as shown in FIG. 5A, the shape of the permanent magnet 1 is made the same as that of the second magnetic member 3, and the area with respect to the nonmagnetic portion 4 is reduced. The magnetic flux can be effectively extracted with respect to the usage amount of the permanent magnet 1, and a rotor with good cost performance can be obtained.

  FIG. 5B is a view corresponding to FIG. 2B when the permanent magnet 1 shown in FIG. 5A is used. When the magnetic member (the first magnetic member 2 and the second magnetic member 3) is manufactured by molding, if a portion corresponding to the non-magnetic portion 4 is formed in the mold in advance, FIG. It is possible to manufacture a rotor having a form as shown in FIG. 5B by inserting only the permanent magnet 1 shown in FIG.

  FIG. 6 shows an induced voltage waveform of the synchronous motor using the rotor 100 of the synchronous motor shown in FIG. For comparison, the induced voltage waveform of the synchronous motor using the rotor 100 of the synchronous motor not having the nonmagnetic portion 4 is also shown.

  As shown in FIG. 6, the synchronous motor rotor 100 having the nonmagnetic portion 4 on the outer periphery of the rotor was used as compared with the induced voltage when the rotor having no nonmagnetic portion 4 on the outer periphery of the rotor was used. It can be seen that the induced voltage of the synchronous motor has less waveform distortion.

  FIG. 7 shows a cogging torque waveform of the synchronous motor using the synchronous motor rotor 100 shown in FIG. For comparison, a waveform of the cogging torque of the synchronous motor using the rotor 100 of the synchronous motor not having the nonmagnetic portion 4 is also shown. Accordingly, the waveform of the cogging torque of the synchronous motor using the synchronous motor rotor 100 having the nonmagnetic portion 4 shown in FIG. 1 is the synchronous motor using the synchronous motor rotor 100 not having the nonmagnetic portion 4. It can be seen that this is smaller than the cogging torque waveform.

  As described above, according to this embodiment, the shape of the second magnetic body member 3 in the outer peripheral portion is cut out at the four corners of the outer portion of the permanent magnet 1 having one magnetic pole in the vicinity of both ends in the axial direction. Thus, by forming a substantially octagonal shape with respect to one magnetic pole, when the rotor rotates, the area where the second magnetic body member 3 on the outer periphery faces the teeth of the stator at first. As the rotation is smaller toward the center of the magnetic pole, the amount of increase in area gradually increases, so that the sudden flow of magnetic flux into the stator teeth is suppressed, and the induced voltage distortion generated in the windings is reduced. As a result, a synchronous motor with reduced vibration and noise can be obtained by suppressing torque pulsation.

  In addition, by making the shape of the permanent magnet 1 the same as that of the second magnetic member 3 and reducing the area with respect to the non-magnetic portion 4, the total amount of magnetic flux is reduced. The magnetic flux can be extracted effectively, and a rotor with good cost performance can be obtained.

  Further, since the shape of the permanent magnet 1 can be a simple flat plate shape, the processing cost of the permanent magnet 1 can be suppressed, and the cost can be increased when using a sintered rare earth magnet having high magnetic properties. It can be suppressed.

Embodiment 2. FIG.
8 to 11 are diagrams showing the second embodiment, FIG. 8 is a perspective view of the rotor 100 of the synchronous motor, and FIG. 9 is a perspective view showing a state in which the nonmagnetic portion 4 of FIG. 8 is removed ((a)). 8 is a state in which the non-magnetic portion 4 of FIG. 8 is removed, and FIG. 8B is a diagram showing a case where the magnetic member (the first magnetic member 2 and the second magnetic member 3) is manufactured by molding in advance. 10 is a state in which members constituting the rotor 100 of the synchronous motor of FIG. 8 are separated from each other by forming a portion corresponding to the portion 4 and allowing only the permanent magnet 1 to be inserted. FIG. 11 is a perspective view separately showing members constituting the rotor 100 of the synchronous motor according to the modified assembly method ((a) is a state before the permanent magnet 1 and the nonmagnetic portion 4 are assembled; (B) is the state which assembled the permanent magnet 1 and the nonmagnetic part 4).

  The configuration of the rotor 100 of the synchronous motor will be described with reference to FIGS. The rotor 100 of the synchronous motor is formed of a material containing soft magnetic powder, and is disposed on the outer periphery of the first magnetic member 2 having a back yoke function, the flat permanent magnet 1, and the permanent magnet 1. The second magnetic member 3 made of a material containing soft magnetic powder and the nonmagnetic portion 4 filling the space between the second magnetic member 3 disposed on the outer peripheral portion of the permanent magnet 1 are provided.

  The permanent magnet 1 shown in the present embodiment is a flat rectangular shape.

  Moreover, the 1st magnetic body member 2 is provided with the rotating shaft fitting hole 5 in which a rotating shaft fits in the center part.

  FIG. 9A shows a state where the nonmagnetic portion 4 of FIG. 8 is removed. As can be seen, the second magnetic body member 3 on the outer peripheral portion has a shape in which one corner of the outer portion of the permanent magnet 1 having one magnetic pole is cut off at both axial ends. At this time, the notched portion of the second magnetic member 3 has different positions in the circumferential direction at both ends in the axial direction, and one of the two diagonal lines before the notch of the second magnetic member 3 (upper right) 2 corners on the upper left are cut out. However, two corners on another diagonal line (from the upper left to the lower right) may be cut out.

  Accordingly, the second magnetic body member 3 forms an irregular hexagonal shape with respect to one magnetic pole, and when viewed in the axial direction, the second magnetic body member 3 on the outer peripheral portion of the permanent magnet 1 is skewed. It has a shape like that.

  For this reason, in the outer peripheral part of the permanent magnet 1, the substantially triangular nonmagnetic part 4 exists on one diagonal line (upper right to lower left) of the permanent magnet 1.

  By forming the second magnetic member 3 as described above, the second magnetic member 3 facing the outer peripheral surface of the permanent magnet 1 constituting each one magnetic pole has a large area near the center of the magnetic pole, The area becomes smaller in the vicinity between the magnetic poles.

  The nonmagnetic portion 4 on the outer periphery of the rotor does not necessarily need to be filled with any nonmagnetic material, and there is nothing if it is not necessary to consider the influence of the rotor strength, windage loss, etc. It may be in a state.

  When the rotor 100 of the synchronous motor rotates, the area of the second magnetic member 3 on the outer peripheral portion facing the teeth (not shown) of the stator is as follows. It gradually increases in proportion to the rotation angle of the rotor.

  On the other hand, in the rotor 100 of the synchronous motor having the nonmagnetic portion 4, the area of the second magnetic member 3 on the outer periphery that initially faces the stator teeth is increased with respect to the rotation angle of the rotor. There is little, and the increase in area gradually increases.

  When there is an outer peripheral magnetic body on the entire surface of the rotor, the magnetic flux generated from the permanent magnet easily changes direction in the outer peripheral magnetic body. For this reason, when a part of the outer peripheral magnetic body starts to face the stator teeth during the rotation of the rotor, the magnetic flux suddenly flows to the opposite portion of the stator slot opening (not shown) having a lower magnetic resistance. Because of the concentration, the magnetic flux flowing into the teeth starting to face each other increases rapidly. This sudden change in magnetic flux distorts the induced voltage generated in the stator windings, increasing the torque pulsation of the synchronous motor, which causes vibration and noise.

  In the synchronous motor rotor 100 according to the present embodiment, when the rotor rotates, the area where the outer peripheral second magnetic member 3 is opposed to the teeth of the stator is initially small and rotates toward the center of the magnetic pole. As the distance increases, the amount of area increase gradually increases. Therefore, the sudden flow of magnetic flux into the teeth is suppressed, distortion of the induced voltage generated in the winding is reduced, torque pulsation is suppressed, and a synchronous motor with less vibration and noise can be obtained.

  In general, in the case of a rotor in which the permanent magnet 1 is disposed inside the rotor, a rotor core in which electromagnetic steel plates are laminated is often used, and the second magnet on the outer periphery like the rotor shown in FIG. 8 (FIG. B1). In order to construct the body member 3, the rotor 100 of the synchronous motor as shown in FIG. 8 (FIG. B1) is not realized by gradually changing the shape of punching the electromagnetic steel sheet for each laminated electromagnetic steel sheet. Do not.

  However, in this case, since there are many types of electromagnetic steel sheets to be punched, a large-scale mold and press equipment are required.

  On the other hand, the rotor 100 of the synchronous motor shown in the present embodiment can freely form the shape of the second magnetic member 3 by molding a material containing soft magnetic powder with a mold.

  For example, when manufacturing the rotor 100 of the synchronous motor according to the present embodiment, as shown in FIG. 10, the first magnetic member 2 having a back yoke function as a member constituting the rotor, A rotor can be formed by processing and assembling the permanent magnet 1 and the second magnetic member 3 disposed on the outer periphery of the permanent magnet 1. When the members of FIG. 10 are assembled, a rotor having a shape as shown in FIG. 9A is formed.

  If it is not necessary to consider the influence of the strength of the rotor and windage loss during rotation, the above-mentioned members (first magnetic member 2, permanent magnet 1, second magnetic member 3) can be fixed by bonding. That's fine.

  Further, the non-magnetic resin material is integrally formed to fix each member (the first magnetic member 2, the permanent magnet 1, and the second magnetic member 3) and to form the non-magnetic portion 4. By doing so, the rotor can be manufactured.

  Further, as shown in FIGS. 11 (a) and 11 (b), a plate-shaped permanent magnet 1 and a nonmagnetic portion 4 on the outer periphery of the rotor are assembled in advance and integrated with a material containing soft magnetic powder. The rotor shown in FIG. 8 can also be manufactured by molding the first magnetic member 2 and the second magnetic member 3.

  In the synchronous motor rotor 100 according to the present embodiment, since the second magnetic member 3 is present on the surface of the permanent magnet 1, reluctance torque can be used, thereby improving the torque of the synchronous motor. It is.

  Further, since the shape of the permanent magnet 1 can be a simple flat plate shape, the processing cost of the permanent magnet 1 can be suppressed, and an increase in cost can be suppressed even when a sintered rare earth magnet having high magnetic properties is used. .

  In the nonmagnetic portion 4 on the outer periphery of the rotor, the portion facing the nonmagnetic portion 4 of the permanent magnet 1 has a large magnetic resistance, and compared with the portion having the second magnetic body member 3 that is a magnetic body on the surface. Less magnetic flux is generated. For this reason, it may not necessarily be optimal from the viewpoint of cost performance.

  In this case, as in FIG. 5 of the first embodiment, the shape of the permanent magnet 1 is made the same as that of the second magnetic member, and the area with respect to the nonmagnetic portion 4 is reduced. The magnetic flux can be effectively extracted with respect to the usage amount of the permanent magnet, and a rotor with good cost performance can be obtained.

  As described above, according to this embodiment, the second magnetic member 3 in the outer peripheral portion has a shape in which one corner of the outer portion of the permanent magnet 1 having one magnetic pole is cut out at both axial ends. An irregular hexagonal shape is formed with respect to one magnetic pole, and a substantially triangular nonmagnetic portion 4 exists on the diagonal line of the permanent magnet 1 at the outer peripheral portion of the permanent magnet 1. By forming the second magnetic member 3 in this way, the second magnetic member 3 facing the outer peripheral surface of the permanent magnet 1 constituting each one magnetic pole has a large area near the center of the magnetic pole, and the magnetic pole The shape becomes smaller in the vicinity of the gap. When the rotor rotates, the area where the outer peripheral second magnetic member 3 faces the teeth of the stator is small at first, and the amount of increase in area gradually increases as the rotation proceeds toward the center of the magnetic pole. Therefore, the sudden flow of magnetic flux into the teeth is suppressed, distortion of the induced voltage generated in the winding is reduced, torque pulsation is suppressed, and a synchronous motor with less vibration and noise can be obtained.

  In addition, the rotor 100 of the synchronous motor according to the present embodiment has the second magnetic member 3 on the surface of the permanent magnet 1, so that reluctance torque can be used, thereby improving the torque of the synchronous motor. Is possible.

  Further, since the shape of the permanent magnet 1 can be a simple flat plate shape, the processing cost of the permanent magnet 1 can be suppressed, and an increase in cost can be suppressed even when a sintered rare earth magnet having high magnetic properties is used. .

  In addition, by making the shape of the permanent magnet 1 the same as that of the second magnetic member and reducing the area with respect to the non-magnetic portion 4, the total amount of magnetic flux is reduced. Can be effectively extracted, and a rotor with good cost performance can be obtained.

Embodiment 3 FIG.
12 to 16 show the third embodiment, FIG. 12 is a perspective view of the rotor 100 of the synchronous motor, FIG. 13 is a perspective view showing a state in which the nonmagnetic portion 4 of FIG. 12 is removed, and FIG. 12 is a perspective view showing a state in which members constituting the rotor 100 of the synchronous motor shown in FIG. 12 are separated, and FIG. 15 is a perspective view showing the members constituting the rotor 100 of the synchronous motor separated by an assembling method according to a modified example. ) Is a state before the permanent magnet 1 and the nonmagnetic part 4 are assembled, (b) is a state where the permanent magnet 1 and the nonmagnetic part 4 are assembled), and FIG. 16 is a rotor of the synchronous motor of the modified example of FIG. FIG. 100 is a perspective view of (100) before assembly and (b) after assembly.

  The configuration of the rotor 100 of the synchronous motor will be described with reference to FIGS. The rotor 100 of the synchronous motor is formed of a material containing soft magnetic powder, and is disposed on the outer periphery of the first magnetic member 2 having the function of a back yoke, the flat permanent magnet 1, and the permanent magnet 1. The nonmagnetic part 4 satisfy | fills between the 2nd magnetic body member 3 comprised by the material containing the soft magnetic powder which is comprised, and the 2nd magnetic body member 3 arrange | positioned at the outer peripheral part of the permanent magnet 1.

  The permanent magnet 1 shown in the present embodiment is a flat rectangular shape. Here, for example, four permanent magnets 1 are used. The permanent magnet 1 uses a sintered permanent magnet.

  Moreover, the 1st magnetic body member 2 is provided with the rotating shaft fitting hole 5 in which a rotating shaft fits in the center part.

  FIG. 13 shows the rotor in a state where the nonmagnetic part 4 of FIG. 12 is removed. As can be seen, the second magnetic member 3 on the outer peripheral portion has a shape in which both sides of the outer portion of the permanent magnet 1 having one magnetic pole are cut out in the vicinity of the center in the axial direction.

  The second magnetic member has a configuration in which the volume is large at both axial ends, and the volume gradually decreases toward the center in the axial direction.

  For this reason, the substantially triangular nonmagnetic part 4 exists in the outer peripheral part of the permanent magnet 1 in the vicinity of both sides near the center of the permanent magnet 1 in the axial direction. Exists.

  By forming the second magnetic member 3 as described above, the second magnetic member 3 facing the outer peripheral surface of the permanent magnet 1 constituting each one magnetic pole has a large area near the center of the magnetic pole, The area becomes smaller in the vicinity between the magnetic poles.

  The nonmagnetic portion 4 on the outer periphery of the rotor does not necessarily need to be filled with any nonmagnetic material, and there is nothing if it is not necessary to consider the influence of the rotor strength, windage loss, etc. It may be in a state.

  When the rotor 100 of the synchronous motor rotates, the area of the outer periphery facing the stator teeth is proportional to the rotation angle of the rotor in the case of a rotor that is entirely magnetic. Increase gradually.

  On the other hand, in the rotor 100 of the synchronous motor having the nonmagnetic portion 4, the area of the second magnetic member 3 on the outer periphery that initially faces the stator teeth is increased with respect to the rotation angle of the rotor. There is little, and the increase in area gradually increases.

  When there is an outer peripheral magnetic body on the entire surface of the rotor, the magnetic flux generated from the permanent magnet 1 easily changes direction in the outer peripheral magnetic body. For this reason, if a part of the outer peripheral magnetic body begins to face the teeth of the stator during rotation of the rotor, the magnetic flux suddenly concentrates on the facing portion of the stator slot opening where there is less magnetic resistance. The magnetic flux flowing into the teeth starting with a sudden increase. This sudden change in magnetic flux distorts the induced voltage generated in the stator windings, increasing the torque pulsation of the synchronous motor, which causes vibration and noise.

  In the synchronous motor rotor 100 according to the present embodiment, when the rotor rotates, the area where the outer peripheral second magnetic member 3 is opposed to the teeth of the stator is initially small and rotates toward the center of the magnetic pole. As the distance increases, the amount of area increase gradually increases. Therefore, the sudden flow of magnetic flux into the teeth is suppressed, distortion of the induced voltage generated in the winding is reduced, torque pulsation is suppressed, and a synchronous motor with less vibration and noise can be obtained.

  Usually, in the case of a rotor in which the permanent magnet 1 is disposed inside the rotor, a rotor core in which electromagnetic steel plates are laminated is often used, and the second magnet on the outer periphery like the rotor shown in FIG. 12 (FIG. C1). In order to configure the body member 3, the rotor of the synchronous motor as shown in FIG. 12 (FIG. C1) must be realized by gradually changing the shape of punching the electromagnetic steel sheet for each laminated electromagnetic steel sheet. should not.

  However, in this case, since there are many types of electromagnetic steel sheets to be punched, a large-scale mold and press equipment are required.

  On the other hand, the rotor 100 of the synchronous motor shown in the present embodiment can freely form the shape of the second magnetic member 3 by molding a material containing soft magnetic powder using a mold. .

  For example, when the rotor shown in the present embodiment is manufactured, as shown in FIG. 14, as a member constituting the rotor, the first magnetic member 2 having the function of a back yoke, a plate-shaped permanent magnet 1. A rotor can be constituted by processing and assembling the second magnetic body members 3 arranged on the outer periphery of the permanent magnet 1. When the members shown in FIG. 14 are assembled, a rotor having a shape as shown in FIG. 13 is formed.

  If it is not necessary to consider the influence of the strength of the rotor and windage loss during rotation, the above-mentioned members (first magnetic member 2, permanent magnet 1, second magnetic member 3) can be fixed by bonding. That's fine.

  Further, the non-magnetic resin material is integrally formed to fix each member (the first magnetic member 2, the permanent magnet 1, and the second magnetic member 3) and to form the non-magnetic portion 4. By doing so, the rotor can be manufactured.

  Further, as shown in FIGS. 15A and 15B, the flat plate-shaped permanent magnet 1 and the nonmagnetic portion 4 on the outer periphery of the rotor are assembled in advance and integrated with a material containing soft magnetic powder. The rotor shown in FIG. 12 can also be manufactured by molding the first magnetic member 2 and the second magnetic member 3.

  In the rotor shown in the present embodiment, since the nonmagnetic portion 4 is present in the central portion in the axial direction of the rotor, a member constituting the nonmagnetic portion 4 is manufactured in advance with a nonmagnetic material such as a resin, and the permanent magnet 1 In addition, the rotor shown in FIG. 12 can be easily manufactured by insert molding.

  In the synchronous motor rotor 100 according to the present embodiment, since the second magnetic member 3 is present on the surface of the permanent magnet 1, reluctance torque can be used, thereby improving the torque of the synchronous motor. It is.

  Further, since the shape of the permanent magnet 1 can be a simple flat plate shape, the processing cost of the permanent magnet 1 can be suppressed, and an increase in cost can be suppressed even when a sintered rare earth magnet having high magnetic properties is used. .

  In the nonmagnetic portion 4 on the outer periphery of the rotor, the portion facing the nonmagnetic portion 4 of the permanent magnet 1 has a large magnetic resistance, and the generated magnetic flux is larger than that of the portion having the second magnetic member 3 on the surface. Less. For this reason, it may not necessarily be optimal from the viewpoint of cost performance.

  In this case, as shown in FIG. 16, the shape of the permanent magnet 1 is made the same shape as the second magnetic body member 3 on the outer periphery, and the total magnetic flux amount is reduced by reducing the area with respect to the nonmagnetic portion 4. With respect to the usage amount of the permanent magnet 1, the magnetic flux can be extracted effectively, and a rotor with good cost performance can be obtained. In this case, since the permanent magnet 1 constituting one magnetic pole has a constricted shape near the center in the axial direction, it can be formed into a simple shape by using a shape divided into two vertically.

  As described above, according to this embodiment, the second magnetic member 3 in the outer peripheral portion is the permanent magnet 1 having one magnetic pole in the vicinity of the center in the axial direction. The outer peripheral portion of the permanent magnet 1 is cut out on both sides, and a substantially triangular non-magnetic portion 4 is present near both sides near the axial center of the permanent magnet 1 on the outer periphery of the permanent magnet 1. As shown in FIG. 2, there is a non-magnetic portion 4 having a substantially rhombic shape. By forming the second magnetic member 3 in this way, the second magnetic member 3 facing the outer peripheral surface of the permanent magnet 1 constituting each one magnetic pole has a large area near the center of the magnetic pole, and the magnetic pole The shape becomes smaller in the vicinity of the gap. When the rotor rotates, the area where the outer peripheral second magnetic member 3 faces the teeth of the stator is small at first, and the amount of increase in area gradually increases as the rotation proceeds toward the center of the magnetic pole. Therefore, the sudden flow of magnetic flux into the teeth is suppressed, distortion of the induced voltage generated in the winding is reduced, torque pulsation is suppressed, and a synchronous motor with less vibration and noise can be obtained.

  In addition, the rotor 100 of the synchronous motor according to the present embodiment has the second magnetic member 3 on the surface of the permanent magnet 1, so that reluctance torque can be used, thereby improving the torque of the synchronous motor. Is possible.

  Further, since the shape of the permanent magnet 1 can be a simple flat plate shape, the processing cost of the permanent magnet 1 can be suppressed, and an increase in cost can be suppressed even when a sintered rare earth magnet having high magnetic properties is used. .

  In addition, by making the shape of the permanent magnet 1 the same as that of the second magnetic member and reducing the area with respect to the non-magnetic portion 4, the total amount of magnetic flux is reduced. Can be effectively extracted, and a rotor with good cost performance can be obtained.

Embodiment 4 FIG.
FIGS. 17 to 2122 are views showing the fourth embodiment, FIG. 17 is a perspective view of the rotor 100 of the synchronous motor, FIG. 18 is a perspective view showing a state in which the nonmagnetic portion 4 of FIG. 17 is removed, and FIG. FIG. 20 is a perspective view showing a state where the members constituting the rotor of FIG. 17 (FIG. D1) are separated, and FIG. 20 is a perspective view showing the members constituting the rotor 100 of the synchronous motor according to the modified assembly method. ) Is a state before the permanent magnet 1 and the nonmagnetic part 4 are assembled, (b) is a state where the permanent magnet 1 and the nonmagnetic part 4 are assembled), and FIG. 21 is a rotor of the synchronous motor of the modified example of FIG. FIG. 22 is a perspective view of the rotor 100 of the synchronous motor of the modification of FIG.

  The configuration of the rotor 100 of the synchronous motor will be described with reference to FIGS. The rotor 100 of the synchronous motor is formed of a material containing soft magnetic powder, and is disposed on the outer periphery of the first magnetic member 2 having the function of a back yoke, the flat permanent magnet 1, and the permanent magnet 1. A second magnetic member 3 made of a material containing soft magnetic powder and a nonmagnetic portion 4 filling the space between the second magnetic members 3 arranged on the outer peripheral portion of the permanent magnet 1.

  The permanent magnet 1 shown in the present embodiment is a flat rectangular shape.

  Moreover, the 1st magnetic body member 2 is provided with the rotating shaft fitting hole 5 in which a rotating shaft fits in the center part.

  FIG. 18 shows the rotor with the nonmagnetic portion 4 of FIG. 17 removed. As can be seen from FIG. 18, the second magnetic body member 3 on the outer peripheral portion is 1 in the vicinity of the center in the axial direction. The shape is such that both sides in the vicinity of the circumferential end facing the permanent magnet 1 of the magnetic pole are cut out.

  The cut-out portions of the second magnetic member 3 have different axial positions on both sides in the circumferential direction. In the front view of FIG. 18, the cut-out portion on the right side of the second magnetic member 3 is below the center in the axial direction, and the cut-out portion on the left side of the second magnetic member 3 is above the center in the axial direction. It is in.

  The cut out portions of each second magnetic member 3 have a substantially triangular shape (right triangle), and the long sides of the second magnetic member 3 are positioned on a substantially diagonal line of the second magnetic member 3. ing.

  For this reason, in the outer peripheral part of the permanent magnet 1, the substantially triangular nonmagnetic part 4 exists above and below the axial center of both sides in the circumferential direction of the permanent magnet 1.

  By forming the second magnetic member 3 as described above, the second magnetic member 3 facing the outer peripheral surface of the permanent magnet 1 constituting each one magnetic pole has a large area near the center of the magnetic pole, The area becomes smaller in the vicinity between the magnetic poles.

  The nonmagnetic portion 4 on the outer periphery of the rotor does not necessarily need to be filled with any nonmagnetic material, and there is nothing if it is not necessary to consider the influence of the rotor strength, windage loss, etc. It may be in a state.

  When the rotor 100 of the synchronous motor rotates, the area of the outer periphery facing the stator teeth is proportional to the rotation angle of the rotor in the case of a rotor that is entirely magnetic. Increase gradually.

  On the other hand, in the rotor 100 of the synchronous motor having the non-magnetic portion 4, the area of the second magnetic member 3 that initially faces the teeth of the stator is small with respect to the rotation angle of the rotor. The area increases gradually and gradually.

  When there is an outer peripheral magnetic body on the entire surface of the rotor, the magnetic flux generated from the permanent magnet 1 easily changes direction in the outer peripheral magnetic body. For this reason, if a part of the outer peripheral magnetic body begins to face the teeth of the stator during rotation of the rotor, the magnetic flux suddenly concentrates on the facing portion of the stator slot opening where there is less magnetic resistance. The magnetic flux flowing into the teeth starting with a sudden increase. This sudden change in magnetic flux distorts the induced voltage generated in the stator windings, increasing the torque pulsation of the synchronous motor, which causes vibration and noise.

  In the synchronous motor rotor 100 according to the present embodiment, when the rotor rotates, the area where the second magnetic member 3 is opposed to the teeth of the stator is initially small, and the rotation proceeds toward the center of the magnetic pole. As the area increases, the area increases gradually. Therefore, the sudden flow of magnetic flux into the teeth is suppressed, distortion of the induced voltage generated in the winding is reduced, torque pulsation is suppressed, and a synchronous motor with less vibration and noise can be obtained.

  Usually, in the case of a rotor in which the permanent magnet 1 is disposed inside the rotor, a rotor iron core in which electromagnetic steel plates are laminated is often used, and the second magnetic member 3 on the outer periphery like the rotor shown in FIG. In order to configure, it is necessary to realize the rotor 100 of the synchronous motor as shown in FIG. 17 by gradually changing the shape of punching the electromagnetic steel sheet for each laminated electromagnetic steel sheet.

  However, in this case, since there are many types of electromagnetic steel sheets to be punched, a large-scale mold and press equipment are required.

  On the other hand, the rotor 100 of the synchronous motor shown in the present embodiment can freely form the shape of the second magnetic member 3 by molding a material containing soft magnetic powder using a mold. .

  In the rotor shown in the present embodiment, since the nonmagnetic portion 4 is present from the axial central portion of the rotor, a member that forms the nonmagnetic portion 4 is manufactured in advance with a nonmagnetic material such as a resin, and the permanent magnet 17 is easy to manufacture with the rotor shown in FIG.

  For example, when the rotor shown in the present embodiment is manufactured, as shown in FIG. 19, as a member constituting the rotor, a first magnetic member 2 having a function of a back yoke, a plate-shaped permanent magnet 1. The rotor can be configured by processing and assembling the second magnetic members 3 arranged on the outer periphery of the permanent magnet 1. When the members of FIG. 19 are assembled, a rotor having a shape as shown in FIG. 18 is formed.

  If it is not necessary to consider the influence of the strength of the rotor and windage loss during rotation, the above-mentioned members (first magnetic member 2, permanent magnet 1, second magnetic member 3) can be fixed by bonding. That's fine.

  Further, the non-magnetic resin material is integrally formed to fix each member (the first magnetic member 2, the permanent magnet 1, and the second magnetic member 3) and to form the non-magnetic portion 4. By doing so, the rotor can be manufactured.

  Further, as shown in FIGS. 20A and 20B, the flat plate-shaped permanent magnet 1 and the nonmagnetic portion 4 on the outer periphery of the rotor are assembled in advance and integrated with a material containing soft magnetic powder. The rotor shown in FIG. 17 can also be manufactured by molding the first magnetic member 2 and the second magnetic member 3.

  Since the rotor 100 of the synchronous motor according to the present embodiment has an outer peripheral magnetic body on the surface of the permanent magnet 1, the reluctance torque can be used, and thus the torque of the synchronous motor can be improved.

  Further, since the shape of the permanent magnet 1 can be a simple flat plate shape, the processing cost of the permanent magnet 1 can be suppressed, and an increase in cost can be suppressed even when a sintered rare earth magnet having high magnetic properties is used. .

  In the nonmagnetic portion 4 on the outer periphery of the rotor, the portion facing the nonmagnetic portion 4 of the permanent magnet 1 has a large magnetic resistance, and the generated magnetic flux is larger than that of the portion having the second magnetic member 3 on the surface. Less. For this reason, it may not necessarily be optimal from the viewpoint of cost performance.

  In this case, as shown in FIGS. 21 and 22, the permanent magnet 1 has the same shape as that of the second magnetic member 3 on the outer periphery, and the area with respect to the non-magnetic portion 4 is reduced, so that the entire amount of magnetic flux is reduced. However, the magnetic flux can be effectively extracted with respect to the usage amount of the permanent magnet 1, and a rotor with good cost performance can be obtained.

  In this case, the permanent magnet constituting one magnetic pole has a shape with a constriction near the center in the axial direction. Therefore, a simple shape can be obtained by using a shape divided into two vertically.

  As described above, according to this embodiment, the second magnetic member 3 at the outer peripheral portion is the second magnetic member 3 at the outer peripheral portion, and the second magnetic member 3 is near the center in the axial direction. Thus, both sides in the vicinity of the end in the circumferential direction facing the permanent magnet 1 with one magnetic pole are cut out, and the cut out portions of the second magnetic member 3 have axial positions on both sides in the circumferential direction. Different. The cut-out portion on the right side of the second magnetic member 3 is below the axial center, and the cut-out portion on the left side of the second magnetic member 3 is above the axial center. The cut-out portions of the respective second magnetic members 3 have a substantially triangular shape (right-angled triangle), and the respective long sides are positioned on the substantially diagonal line of the second magnetic member 3. . For this reason, in the outer peripheral part of the permanent magnet 1, substantially triangular nonmagnetic parts 4 exist above and below the axial center of both sides of the permanent magnet 1 in the circumferential direction. By forming the second magnetic member 3 in this way, the second magnetic member 3 facing the outer peripheral surface of the permanent magnet 1 constituting each one magnetic pole has a large area near the center of the magnetic pole, and the magnetic pole The shape becomes smaller in the vicinity of the gap. When the rotor rotates, the area where the outer peripheral second magnetic member 3 faces the teeth of the stator is small at first, and the amount of increase in area gradually increases as the rotation proceeds toward the center of the magnetic pole. Therefore, the sudden flow of magnetic flux into the teeth is suppressed, distortion of the induced voltage generated in the winding is reduced, torque pulsation is suppressed, and a synchronous motor with less vibration and noise can be obtained.

  In addition, the rotor 100 of the synchronous motor according to the present embodiment has the second magnetic member 3 on the surface of the permanent magnet 1, so that reluctance torque can be used, thereby improving the torque of the synchronous motor. Is possible.

  Further, since the shape of the permanent magnet 1 can be a simple flat plate shape, the processing cost of the permanent magnet 1 can be suppressed, and an increase in cost can be suppressed even when a sintered rare earth magnet having high magnetic properties is used. .

  In addition, by making the shape of the permanent magnet 1 the same as that of the second magnetic member and reducing the area with respect to the non-magnetic portion 4, the total amount of magnetic flux is reduced. Can be effectively extracted, and a rotor with good cost performance can be obtained.

  As an application example of the present invention, application to a synchronous motor used in a blower is possible.

FIG. 3 is a diagram showing the first embodiment, and is a perspective view of a rotor 100 of the synchronous motor. 1A and 1B are perspective views showing a state in which a nonmagnetic part 4 in FIG. 1 is removed (a) shows a state in which the nonmagnetic part 4 in FIG. 1 is removed, and FIG. When the first magnetic member 2 and the second magnetic member 3) are manufactured by molding, a portion corresponding to the nonmagnetic portion 4 is formed in advance in the mold, and only the permanent magnet 1 is inserted. Can be manufactured in FIG. 2 is a diagram showing the first embodiment, and is a perspective view in a state where members constituting the rotor of FIG. 1 are separated. The figure which shows Embodiment 1 and is the perspective view which isolate | separates and shows the member which comprises the rotor 100 of the synchronous motor by the assembly method of a modification ((a) is before assembling the permanent magnet 1 and the nonmagnetic part 4) State, (b) is a state in which the permanent magnet 1 and the nonmagnetic part 4 are assembled). The figure which shows Embodiment 1 and is the perspective view of the state (b) except the permanent magnet 1 (a) and the nonmagnetic part 4 which comprise the rotor 100 of the synchronous motor of a modification. FIG. 2 is a diagram illustrating the first embodiment and is a diagram illustrating an induced voltage waveform of the synchronous motor using the rotor 100 of the synchronous motor illustrated in FIG. 1. FIG. 3 is a diagram illustrating the first embodiment and is a diagram illustrating a cogging torque waveform of the synchronous motor using the rotor 100 of the synchronous motor illustrated in FIG. 1. FIG. 5 shows the second embodiment and is a perspective view of the rotor 100 of the synchronous motor. 8A and 8B are perspective views showing a state in which the nonmagnetic part 4 in FIG. 8 is removed (a) shows a state in which the nonmagnetic part 4 in FIG. 8 is removed, and FIG. 8b shows a magnetic member (first member). When the first magnetic member 2 and the second magnetic member 3) are manufactured by molding, a portion corresponding to the nonmagnetic portion 4 is formed in advance in the mold, and only the permanent magnet 1 is inserted. Can be manufactured in FIG. 9 shows the second embodiment, and is a perspective view in a state where members constituting the rotor 100 of the synchronous motor of FIG. 8 are separated. The figure which shows Embodiment 2 and is the perspective view which isolate | separates and shows the member which comprises the rotor 100 of the synchronous motor by the assembly method of a modification ((a) is before assembling the permanent magnet 1 and the nonmagnetic part 4) State, (b) is a state in which the permanent magnet 1 and the nonmagnetic part 4 are assembled). FIG. 10 shows the third embodiment and is a perspective view of the rotor 100 of the synchronous motor. FIG. 13 shows the third embodiment, and is a perspective view showing a state in which the nonmagnetic part 4 of FIG. 12 is removed. FIG. 13 is a diagram showing the third embodiment, and is a perspective view showing a state in which members constituting the rotor 100 of the synchronous motor of FIG. 12 are separated. The figure which shows Embodiment 3, and is a perspective view which isolate | separates and shows the member which comprises the rotor 100 of the synchronous motor by the assembly method of a modification ((a) is before assembling the permanent magnet 1 and the nonmagnetic part 4) State, (b) is a state in which the permanent magnet 1 and the nonmagnetic part 4 are assembled). It is a figure which shows Embodiment 3, and is a perspective view of the rotor 100 of the synchronous motor of the modification of FIG. 12 ((a) is before an assembly, (b) is after an assembly). FIG. 10 shows the fourth embodiment and is a perspective view of the rotor 100 of the synchronous motor. FIG. 18 is a diagram illustrating the fourth embodiment, and is a perspective view illustrating a state in which the nonmagnetic portion 4 of FIG. 17 is removed. FIG. 18 is a diagram showing the fourth embodiment, and is a perspective view in a state where members constituting the rotor of FIG. 17 are separated. The figure which shows Embodiment 4 and is the perspective view which isolate | separates and shows the member which comprises the rotor 100 of the synchronous motor by the assembly method of a modification ((a) is before assembling the permanent magnet 1 and the nonmagnetic part 4) State, (b) is a state in which the permanent magnet 1 and the nonmagnetic part 4 are assembled). FIG. 20 shows the fourth embodiment and is a perspective view of the rotor 100 of the synchronous motor of the modification of FIG. 19. FIG. 21 shows the fourth embodiment and is a perspective view of the rotor 100 of the synchronous motor of the modification of FIG. 20.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Permanent magnet, 2 1st magnetic body member, 2nd magnetic body member, 4 Nonmagnetic part, 100 Rotor of synchronous motor.

Claims (11)

A first magnetic member formed of a material containing soft magnetic powder and having a back yoke function;
A permanent magnet disposed outside the first magnetic member;
A second magnetic member disposed on the outer periphery of the permanent magnet and made of a material containing soft magnetic powder;
The rotor of a synchronous motor, wherein the second magnetic member has a shape in which an area is large near a center of a magnetic pole constituting the permanent magnet, and an area is small near a magnetic pole.   The synchronous motor rotor according to claim 1, wherein the second magnetic member has a large volume in the vicinity of the center in the axial direction and gradually decreases in volume toward both ends in the axial direction.   The synchronous motor rotor according to claim 2, wherein the second magnetic member is concentrated near the center of the magnetic pole at both axial ends.   The said 2nd magnetic body member is concentrated and exists between the said magnetic poles from the center of the said magnetic pole in axial direction both ends, and the circumferential direction position where it concentrates differs in axial direction both ends. Synchronous motor rotor.   The synchronous motor rotor according to claim 1, wherein the second magnetic body member has a large volume at both axial ends, and the volume gradually decreases toward the center in the axial direction.   6. The synchronous motor rotor according to claim 5, wherein the second magnetic member is concentrated near the center of the magnetic pole in the vicinity of the center in the axial direction.   The said 2nd magnetic body member concentrates and exists between the said magnetic poles from the center of the said magnetic pole in the axial direction vicinity, and the circumferential direction position where it concentrates differs in the axial direction center. Synchronous motor rotor.   The synchronous motor rotor according to claim 1, wherein a shape of the permanent magnet is matched with a shape of the second magnetic member.   The synchronous motor rotor according to any one of claims 1 to 8, further comprising a nonmagnetic portion that fills a space between the second magnetic body members disposed on an outer peripheral portion of the permanent magnet. A method for manufacturing a rotor of a synchronous motor according to any one of claims 1 to 9,
A method of manufacturing a rotor of a synchronous motor, wherein the rotor is formed by adhering the first magnetic member, the permanent magnet, and the second magnetic member by adhesion. A method for manufacturing a rotor of a synchronous motor according to any one of claims 1 to 9,
A method of manufacturing a rotor of a synchronous motor, wherein the rotor is formed by integrally forming the first magnetic member, the permanent magnet, and the second magnetic member with a nonmagnetic material. .