JP2012039709A - Motor, pump with motor as drive source, and pump-driven apparatus using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor, pump with motor as drive source, and pump-driven apparatus using the same, capable of achieving noise reduction and low vibration.SOLUTION: The motor 1 includes a plurality of stators 3, 4 having stator cores 31, 41 and winding wires 32, 42; a permanent magnet 22; and at least one rotor 2 that rotates around a rotating shaft 21. The plurality of stators 3, 4 and the rotors 2 are arranged to be concentric. A length L2 of the external stator 4 in the rotating shaft 21 direction is set to be shorter than a length L1 of the internal stator 3 in the rotating shaft 21 direction.

Description

  The present invention relates to a motor, a pump using the motor as a drive source, and a pump driving device equipped with the pump.

  Conventionally, as a motor, an inner stator is disposed on the inner peripheral side of a cylindrical permanent magnet provided on the rotor, and an outer stator is disposed on the outer peripheral side, and excitation is performed by two stators to increase torque. Those are known (for example, see Patent Document 1).

Japanese Patent Laid-Open No. 2000-60101

  However, in such a conventional technique, the entire length of the inner stator in the rotation axis direction is equal to the entire length of the outer stator in the rotation axis direction, and the opposing area of each stator to the permanent magnet is larger for the outer stator. It is larger than the inner stator.

  Therefore, when the magnetic flux density of the permanent magnet is equal between the inner periphery and the outer periphery, the torque generated between the permanent magnet and the outer stator is larger than the torque generated between the permanent magnet and the inner stator, Torque ripple will increase.

  As described above, the conventional technique has a problem that since the torque ripple is increased, it is difficult to achieve low noise and low vibration of the motor.

  Accordingly, an object of the present invention is to obtain a motor that can achieve further reduction in noise and vibration, a pump that uses the motor as a drive source, and a pump drive device that includes the pump.

  A motor according to the present invention includes a plurality of stators having a stator core and windings, and at least one rotor having a permanent magnet and rotating around a rotation axis, wherein the plurality of stators and the rotor include In the motor arranged concentrically, the plurality of stators is characterized in that the length of the outer stator in the direction of the rotation axis is shorter than the length of the inner stator in the direction of the rotation axis.

  The pump according to the present invention is characterized by using the motor as a drive source.

  Moreover, the pump drive device according to the present invention is equipped with the above-described pump.

  According to the present invention, the length of the outer stator in the rotation axis direction is shorter than the length of the inner stator in the rotation axis direction. Therefore, the difference between the facing area of the outer stator with the permanent magnet and the facing area of the inner stator with the permanent magnet can be further reduced. As a result, it is possible to reduce the difference in torque generated between the outer stator and the inner stator in the permanent magnet. Therefore, it is possible to reduce torque ripple, and it is possible to achieve noise reduction and low vibration of the motor.

  As described above, according to the present invention, it is possible to obtain a motor that can achieve further noise reduction and vibration reduction, a pump that uses the motor as a drive source, and a pump drive device that includes the pump.

1 is a half sectional view schematically showing a motor according to a first embodiment of the present invention. FIG. 2 is a perspective view showing the inside of the motor according to the first embodiment. FIG. 3 is a plan view showing the relationship between the permanent magnet, the inner stator, and the outer stator of the motor according to the first embodiment. FIG. 4 is a half sectional view schematically showing a motor according to the second embodiment of the present invention. FIG. 5 is a half sectional view schematically showing a motor according to the third embodiment of the present invention. FIG. 6 is a half sectional view schematically showing a motor according to the fourth embodiment of the present invention. FIG. 7 is a half sectional view schematically showing a motor according to a fifth embodiment of the present invention. FIG. 8 is a plan view showing the inside of the motor according to the fifth embodiment of the present invention. FIG. 9 is an internal plan view showing a modification of the motor according to the fifth embodiment of the present invention. FIG. 10 is a half sectional view schematically showing a motor according to the sixth embodiment of the present invention. FIG. 11 is a half sectional view schematically showing a motor according to a seventh embodiment of the present invention. FIG. 12 is a cross-sectional view schematically showing a pump according to the eighth embodiment of the present invention. FIG. 13: is sectional drawing which shows typically the internal structure of the dishwasher concerning 9th Embodiment of this invention. FIG. 14 is a system diagram schematically showing a hot water supply unit according to a first modification of the ninth embodiment of the present invention. FIG. 15: is sectional drawing which shows typically the internal structure of the washing machine concerning the 2nd modification of 9th Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Note that similar components are included in the following embodiments. Therefore, in the following, common reference numerals are given to those similar components, and redundant description is omitted.

(First embodiment)
As shown in FIG. 1, the motor 1 according to the present embodiment includes a rotor having a cylindrical permanent magnet 22 centered on a rotary shaft 21 (having a permanent magnet 22 and rotating around the rotary shaft 21. Two rotors) 2. The inner stator 3 is arranged concentrically with the permanent magnet 22 (rotor 2) on the inner peripheral side of the permanent magnet 22, and the outer stator 4 is concentric with the permanent magnet 22 (rotor 2) on the outer peripheral side. Arranged in a shape. That is, the motor 1 according to the present embodiment is configured as a so-called double stator type motor in which the inner stator 3 and the outer stator 4 are disposed to face each other in the radial direction with the permanent magnet 22 interposed therebetween.

  The rotor 2 has a disk-like rotor case 23 that rotates integrally with the rotary shaft 21, and a bent wall that is bent at a right angle toward the inner side of the motor 1 at the periphery of the rotor case 23. 23a is provided. And the permanent magnet 22 mentioned above is integrally fixed to the inner peripheral surface of this bending wall 23a. The rotating shaft 21 is rotatably supported by a bearing 24.

  The permanent magnet 22 is multipolarly magnetized in the circumferential direction. As shown in FIG. 3, the outer circumference of the permanent magnet 22 is alternately magnetized with N and S poles at equal intervals along the circumferential direction. At the same time, N poles and S poles are alternately magnetized at equal intervals along the circumferential direction of the inner circumference of the permanent magnet 22. At this time, the inner peripheral side and the outer peripheral side of the permanent magnet 22 are magnetized in a state where they are shifted from each other by 90 degrees in electrical angle.

  As shown in FIGS. 2 and 3, the inner stator 3 has an inner stator core 31 in which a plurality of inner claw magnetic poles 31 a are formed at equal intervals on the outer peripheral portion, and an inner circumferential side of the inner claw magnetic pole 31 a arranged in an annular shape. And an inner winding 32 to be disposed.

  In the present embodiment, two inner stator cores 31 each having six inner claw magnetic poles 31a are used. Then, by superimposing the two inner stator cores 31 vertically, the inner claw magnetic pole 31a extending to one side (downward in FIG. 1) of the rotating shaft 21 and the other (upward in FIG. 1) are extended. The inner claw magnetic poles 31a are alternately arranged in the circumferential direction.

  As shown in FIGS. 2 and 3, the outer stator 4 is formed on the outer peripheral side of the outer stator core 41 having a plurality of outer claw magnetic poles 41 a formed at equal intervals on the inner peripheral portion and the outer claw magnetic pole 41 a arranged in an annular shape. And an outer winding 42 to be disposed.

  Further, the outer stator 4 also uses two outer stator cores 41 each having six outer claw magnetic poles 41a, as with the inner stator 3. Then, by superimposing the two outer stator cores 41 on the upper and lower sides, the outer claw magnetic pole 41a extending in one of the axial directions of the rotating shaft 21 (downward in FIG. 1) and the other (upper in FIG. 1) are extended. The outer claw magnetic poles 41a are alternately arranged in the circumferential direction.

  Thus, in this embodiment, a plurality of stators (inner stator 3 and outer stator 4) having a stator core (inner stator core 31 and outer stator core 41) and windings (inner winding 32 and outer winding 42) are provided. It is arranged concentrically with the rotor 2.

  By energizing the inner winding 32 and the outer winding 42, the inner claw magnetic pole 31a and the outer claw magnetic pole 41a are excited, and the rotor 2 is rotated by torque generated by the magnetic force from the inner side and the outer side.

  Further, the inner stator 3 and the outer stator 4 are covered with the separation plate 5 on the side where the rotating shaft 21 is arranged (upper side in FIG. 1), and the other side is covered with the casing 6. And the inside of the motor 1 in which the inner side stator 3 and the outer side stator 4 are arrange | positioned by the separation plate 5 and the casing 6 is sealed.

  The separating plate 5 is provided with a recessed portion 51 that is recessed in the direction of the bottom 61 of the casing 6 between the inner stator 3 and the outer stator 4, and the permanent magnet 22 and the rotor are provided in the recessed portion 51. A bent wall 23a of the case 23 is disposed. At this time, a slight gap is formed between the inner side walls 51a and 51b of the recessed portion 51 and the permanent magnet 22 and the bent wall 23a so that the rotor 2 can rotate. In addition, the outer surface of the inner claw magnetic pole 31a of the inner stator 3 is arranged in close contact with the inner peripheral surface of the inner wall 51a of the recessed portion 51, and on the outer peripheral surface of the outer wall 51b of the recessed portion 51. The inner surface of the outer claw magnetic pole 41a of the outer stator 4 is arranged almost closely.

  A recess 52 having a diameter substantially the same as the outer diameter of the rotary shaft 21 is formed at the center of the separation plate 5, and the base end 21 a of the rotary shaft 21 is fitted into the recess 52 so as to be relatively rotatable. Yes.

  The casing 6 is provided with an outer peripheral wall 62 whose outer peripheral edge is bent in the direction of the separation plate 5 (upward in FIG. 1). The casing 6 is formed in a circular container shape as a whole. Then, the separation plate 5 and the casing 6 are integrated by joining the tip of the outer peripheral wall 62 to the outer periphery of the separation plate 5. Further, the outer peripheral surface of the outer stator core 41 is in contact with the inner peripheral surface of the outer peripheral wall 62. A predetermined gap is provided between the bottom 61 of the casing 6 and the inner stator 3 and the outer stator 4.

  A positioning plate (positioning member) 7 is disposed between the bottom 61 of the casing 6 and the inner stator 3 and the outer stator 4. Between the positioning plate 7 and the inner stator 3 and the outer stator 4, fitting convex portions 71 and 72 and fitting concave portions 73 and 74 are provided, respectively. In the present embodiment, the fitting convex portion 71 and the fitting concave portion 73 arranged on the inner side correspond to the inner stator 3, and the fitting convex portion 72 and the fitting concave portion 74 arranged on the outer side correspond to the outer stator 4. It corresponds.

  Furthermore, in the present embodiment, both the inner and outer fitting recesses 73 and 74 are provided on the positioning plate 7, the inner fitting protrusion 71 is provided on the inner stator 3, and the outer fitting protrusion is provided on the outer stator 4. 72 is provided.

  That is, in this embodiment, the fitting convex portions 71 and 72 correspond to fitting portions provided in the plurality of stators, respectively, and the fitting concave portions 73 and 74 are provided in the motor 1 (positioning plate 7 as a positioning member). This corresponds to the fitted part.

  The positioning plate 7 is disposed on one side of the inner stator 3 and the outer stator 4 in the direction of the rotation shaft 21 (lower side in FIG. 1). In the present embodiment, the positioning plate 7 is disposed in contact with the bottom 61 of the casing 6. Further, the bottom 51 c of the recessed portion 51 of the separation plate 5 is in contact with the positioning plate 7, and the positioning plate 7 is sandwiched between the bottom 51 c and the bottom 61 of the casing 6.

  The inner fitting recess 73 is provided in a portion of the positioning plate 7 facing the inner stator 3, and the outer fitting recess 74 is provided in a portion of the positioning plate 7 facing the outer stator 4. Further, the inner fitting convex portion 71 is provided at a portion facing the fitting concave portion 73 of the inner stator core 31, and the outer fitting convex portion 72 is formed at a portion facing the fitting concave portion 74 of the outer stator core 41. Is provided.

  In the present embodiment, the inner fitting recess 73 is formed by integrally providing the positioning plate 7 with recess side walls 73 a and 73 b that are opposed to each other with a predetermined interval in the radial direction. Further, the outer fitting concave portion 74 is formed by integrally providing the positioning plate 7 with concave side walls 74a and 74b that are opposed to each other with a predetermined interval in the radial direction. The recess side walls 73a and 73b and the recess side walls 74a and 74b are provided separately from the positioning plate 7 and fixed to the positioning plate 7 to form the inner fitting recess 73 and the outer fitting recess 74. You may make it do.

  Then, the fitting convex portion 71 protruding from the inner stator core 31 is fitted into the fitting concave portion 73 between the concave side walls 73a and 73b, thereby positioning the inner stator 3 in the radial direction. Moreover, the outer stator 4 is positioned in the radial direction by fitting the fitting convex portion 72 protruding from the outer stator core 41 into the fitting concave portion 74 between the concave side walls 74a and 74b. At this time, the inner stator 3 is brought into contact with the tips of the concave side walls 73a and 73b, and the outer stator 4 is brought into contact with the tips of the concave side walls 74a and 74b. Positioning is performed.

  Thus, by positioning the inner stator 3 and the outer stator 4, the concentricity, the rotational axis direction position, the installation angle, the advance angle, and the like are fixed.

  Further, in the present embodiment, the fitting convex portions 71 and 72 are formed separately from the inner stator 3 and the outer stator 4, and the fitting convex portions 71 and 72 formed separately are respectively connected to the respective stators 3, 4. To be combined. Therefore, the fitting convex portions 71 and 72 can be formed without using an expensive stator material, and the cost can be reduced.

  The fitting recesses 73 and 74 may be provided in the inner stator 3 and the outer stator 4, and the fitting protrusions 71 and 72 may be provided in the positioning plate 7. In this case, the fitting concave portions 73 and 74 are fitting portions, and the fitting convex portions 71 and 72 are fitting portions. However, when the fitting recesses 73 and 74 are provided in the inner stator 3 and the outer stator 4, a portion (base wall portion) facing the positioning plate 7 of the stators 3 and 4 is thinned, which affects the flow of magnetic flux. There is a possibility of coming out. Therefore, it is more preferable to form the fitting convex parts 71 and 72 in the inner side stator 3 and the outer side stator 4 like this embodiment. If it carries out like this, it will suppress that the site | part (base wall part) which opposes the positioning plate 7 of the stators 3 and 4 becomes thin, and it can suppress affecting the flow of magnetic flux.

  Further, the motor 1 according to the present embodiment is provided with an inner position detection sensor 8A and an outer position detection sensor 8B that perform position control of the rotor 2. Specifically, the rotational position of the permanent magnet 22 relative to the inner stator 3 is detected by the inner position detection sensor 8A, and the rotational position of the permanent magnet 22 relative to the outer stator 4 is detected by the outer position detection sensor 8B. Yes. The inner position detection sensor 8A and the outer position detection sensor 8B can be configured by using Hall elements or the like, and the commutation control of the motor 1 is performed by detecting the rotational position of the rotor 2 by the position detection sensors 8A and 8B. Is going.

  In the present embodiment, out of the recess side walls 73a, 73b and 74a, 74b constituting the fitting recesses 73 and 74, the outer side surfaces of the recess side walls (fitted parts) 73b and 74a on the side close to the permanent magnet 22 are The inner position detection sensor 8A and the outer position detection sensor 8B are attached.

  That is, as shown in FIG. 1, the inner position detection sensor 8 </ b> A is attached to the outer surface of the recess side wall 73 b facing the permanent magnet 22 of the inner fitting recess 73. On the other hand, the outer position detection sensor 8B is attached to the outer surface of the recess side wall 74a facing the permanent magnet 22 of the outer fitting recess 74. In this way, by attaching the respective position detection sensors 8A and 8B to the recessed side walls 73b and 74a that are the fitted portions, the position detection sensors 8A and 8B are interposed between the inner stator 3 and the outer stator 4. Deviation can be suppressed. Therefore, the position detection of the rotor 2 can be performed with high accuracy.

  Here, in the present embodiment, as shown in FIG. 1, the length of the outer stator 4 in the direction of the rotating shaft 21 is made shorter than the length of the inner stator 3 in the direction of the rotating shaft 21. Specifically, the length L2 of the outer claw magnetic pole 41a in the direction along the rotation axis 21 is made shorter than the length L1 of the inner claw magnetic pole 31a in the direction along the rotation axis 21.

  Thus, by making the length L2 of the outer stator 4 having a large diameter shorter than the length L1 of the inner stator 3 having a small diameter, the opposing area of the outer claw magnetic pole 41a with respect to the permanent magnet 22 becomes the inner side with respect to the permanent magnet 22. It is suppressed that it becomes larger than the opposing area of the claw magnetic pole 31a. That is, the facing area of the outer claw magnetic pole 41a with the permanent magnet 22 is made closer to the facing area of the inner claw magnetic pole 31a with the permanent magnet 22. At this time, the lengths L2 and L1 described above are set so that the facing area of the outer claw magnetic pole 41a with the permanent magnet 22 and the facing area of the inner claw magnetic pole 31a with the permanent magnet 22 are equal. preferable.

  By the way, the magnitude of the torque generated in the rotor 2 by exciting the inner claw magnetic pole 31a and the outer claw magnetic pole 41a can be generally obtained by multiplying the torque constant by the current value. Further, it is known that the torque constant is proportional to the number of magnetic fluxes.

  Therefore, as in the present embodiment, in the inner claw magnetic pole 31a and the outer claw magnetic pole 41a, the ratio of the pole width between any magnetic pole and the adjacent magnetic pole is made constant between the inner claw magnetic pole 31a and the outer claw magnetic pole 41a. When the permanent magnet 22 having the same magnetic flux density at the inner periphery and the outer periphery is used, the magnitude of each torque generated by the inner claw magnetic pole 31a and the outer claw magnetic pole 41a in the rotor 2 is different from that of the permanent magnet 22 of each magnetic pole. It will be proportional to the facing area.

  Therefore, the torque generated on the inner circumference of the permanent magnet 22 by the inner stator 3 and the torque generated on the outer circumference of the permanent magnet 22 by the outer stator 4 by bringing the facing area of the outer claw magnetic pole 41a closer to the facing area of the inner claw magnetic pole 31a. The difference of can be further reduced. In addition, when the opposing area of the outer claw magnetic pole 41a facing the permanent magnet 22 is equal to the opposing area of the inner claw magnetic pole 31a facing the permanent magnet 22, the torque generated on the inner circumference and the outer circumference of the permanent magnet 22 becomes equal.

  In the present embodiment, the length L3 of the permanent magnet 22 in the direction of the rotation shaft 21 has at least the length L1 of the inner stator 3 that is longer in the direction of the rotation shaft 21 (in this embodiment, L3). > L1). The positions of the inner stator core 31 and the outer stator core 41 in the direction of the rotating shaft 21 are arranged so as to be symmetric with respect to the vertical plane of the rotating shaft 21 including the center of the permanent magnet 22 in the direction of the rotating shaft 21. That is, the inner stator core 31, the outer stator core 41, and the permanent magnet 22 (rotor 2) are rotated at the magnetic center in the direction of the rotation axis 21 (in this embodiment, the centers of the lengths L1, L2, and L3 in the direction of the rotation axis 21). It arrange | positions so that it may correspond substantially in the axis | shaft 21 direction.

  With this arrangement, when the thrust force does not act on the rotating shaft 21, an electromagnetic balance in the axial direction among the inner stator 3, the outer stator 4, and the rotor 2 can be achieved. For example, when the motor 1 is used as a gear motor or the like that does not generate a thrust force, vibrations in the direction of the rotation shaft 21 are obtained by substantially matching the magnetic centers of the inner stator core 31, the outer stator core 41, and the permanent magnet 22 in the direction of the rotation shaft 21. The factor is eliminated and low vibration can be achieved.

  As described above, in the present embodiment, the motor 1 is a motor having a double stator structure in which the inner stator 3 and the outer stator 4 are respectively disposed on the inner peripheral side and the outer peripheral side of the permanent magnet 22. Thus, since the motor 1 has a double stator structure, the permanent magnet 22 can be rotated by the excitation of the stators 3 and 4, so that the torque generated in the rotor 2 can be increased. And the motor 1 can be made thin by making the motor 1 into a double stator structure.

  In the present embodiment, the length L2 of the outer stator (outer stator of the plurality of stators) 4 in the direction of the rotation shaft 21 is set to the rotation shaft 21 of the inner stator (inner stator of the plurality of stators) 3. It is shorter than the length L1 in the direction. Therefore, the area of the outer stator 4 (outer claw magnetic pole 41a) facing the permanent magnet 22 can be made closer to the area of the inner stator 3 (inner claw magnetic pole 31a) facing the permanent magnet 22. Thereby, the difference of the torque which generate | occur | produces on the inner peripheral side and the outer peripheral side of the permanent magnet 22 can be made small, respectively. That is, it is possible to balance the torque between the inner peripheral side and the outer peripheral side. Further, by making the length L2 of the outer stator 4 shorter than the length L1 of the inner stator 3, the property that the torque waveform changes depending on the length in the direction of the rotating shaft 21 can be utilized. That is, by appropriately setting the length L2 of the outer stator 4 and the length L1 of the inner stator 3 under the condition of L1> L2, it is possible to cancel the torque waveform that is a cause of increasing torque ripple. Therefore, torque ripple at a level that cannot be reduced by current control or voltage control that has been conventionally performed can be efficiently reduced by a simple method of shortening the length L2 of the outer stator 4. Therefore, torque ripple can be further reduced, and further noise reduction and vibration reduction of the motor 1 can be achieved.

  Further, according to the present embodiment, the inner stator 3, the outer stator 4, and the permanent magnet 22 are arranged so that the magnetic centers in the directions of the respective rotating shafts 21 substantially coincide. Therefore, the electromagnetic balance in the axial direction of the inner stator 3, the outer stator 4, and the rotor 2 can be achieved, and when the motor 1 is used as a motor that does not generate a thrust force, vibration in the direction of the rotating shaft 21 is suppressed. Thus, further vibration reduction of the motor 1 can be achieved.

  Furthermore, according to the present embodiment, between the positioning plate 7 arranged along the inner side surface of the bottom portion 61 of the casing 6 and the inner stator 3 and the outer stator 4, the inner and outer fitting convex portions 71 and 72, Inner and outer fitting recesses 73 and 74 are provided. Then, the inner fitting convex portions 71 and 72 and the outer fitting concave portions 73 and 74 are fitted to each other, thereby positioning the inner stator 3 and the outer stator 4 in the radial direction and the rotating shaft 21 direction. ing. In other words, in the present embodiment, the fitting portions 71 and 72 are provided in the plurality of stators 3 and 4, respectively, and the fitting portions 73 and 75 that are fitted in the positioning portions 7 of the motor 1 and the fitting portions 71 and 72, respectively. 74 is provided. Therefore, the positional relationship between the concentricity and the advance angle of the stators 3 and 4 with respect to the permanent magnet 22, and the position and installation angle of the rotor 2 in the direction of the rotating shaft 21 can be fixed with high accuracy. As a result, the motor 1 can be rotated more smoothly. From this point, the vibration of the motor 1 can be reduced.

  Further, according to the present embodiment, the inner position detection sensor 8A and the outer position detection sensor 8B are provided on the outer surfaces of the recess side walls 73b and 74a on the side close to the permanent magnet 22 of the fitting recesses 73 and 74 as the fitted portions. It is attached. Therefore, the concave side walls 73b and 74a can be effectively used as attachment portions for the position detection sensors 8A and 8B, the number of parts can be reduced, and the inner and outer stators 3 and 4 and the position detection sensors 8A and 8B can be reduced. It is possible to suppress the occurrence of deviation between the two. Therefore, it is possible to detect the position of the rotor 2 with even higher accuracy. From this point, the vibration of the motor 1 can be reduced.

(Second Embodiment)
A motor 1A according to the present embodiment basically has the same configuration as that of the first embodiment, and has a rotor (a permanent magnet 22 having a cylindrical permanent magnet 22 centered on a rotating shaft 21; And at least one rotor 2 that rotates about a rotation shaft 21. The inner stator 3 is arranged concentrically with the permanent magnet 22 (rotor 2) on the inner peripheral side of the permanent magnet 22, and the outer stator 4 is concentric with the permanent magnet 22 (rotor 2) on the outer peripheral side. Arranged in a shape. That is, the motor 1 </ b> A according to the present embodiment is also configured as a so-called double stator type motor in which the inner stator 3 and the outer stator 4 are disposed to face each other in the radial direction with the permanent magnet 22 interposed therebetween.

  Here, the motor 1A according to the present embodiment is mainly different from the motor 1 of the first embodiment in that the positioning plate 7A is thickly formed, and the inner fitting recess 73 and the outer side are formed on the positioning plate 7A itself. This is because the fitting recess 74 is formed.

  That is, as shown in FIG. 4, the positioning plate 7 </ b> A according to the present embodiment is formed with a thickness T <b> 1 that fills the space between the inner stator 3 and the bottom portion 61 of the casing 6 at a portion corresponding to the inner stator 3. Yes. On the other hand, a portion corresponding to the outer stator 4 is formed to have a thickness T2 that fills the space between the outer stator 4 and the bottom 61 of the casing 6. The inner stator 3 and the outer stator 4 are in direct contact with the positioning plate 7A.

  At this time, the positioning plate 7A is provided with a recess 75 in a portion corresponding to the recessed portion 51 of the separation plate 5. Further, the recess 75 is expanded so that sufficient spaces S1 and S2 are provided in the vicinity of the inner wall 51a and the outer wall 51b of the recessed portion 51 to dispose the inner position detection sensor 8A and the outer position detection sensor 8B. Has been.

  Also according to this embodiment described above, the same operations and effects as those of the first embodiment can be achieved.

  Further, according to the present embodiment, the positioning plate 7A is formed thick, and the inner fitting recess 73 and the outer fitting recess 74 are formed in the positioning plate 7A itself. As a result, the support area where the inner stator 3 and the outer stator 4 come into contact with the positioning plate 7A can be increased, and therefore the positioning of the stators 3 and 4 in the direction of the rotation shaft 21 can be performed more stably. Further vibration reduction can be achieved.

(Third embodiment)
The motor 1B according to the present embodiment basically has the same configuration as that of the first embodiment, and has a rotor (a permanent magnet 22 having a cylindrical permanent magnet 22 around the rotation shaft 21; And at least one rotor 2 that rotates about a rotation shaft 21. The inner stator 3 is arranged concentrically with the permanent magnet 22 (rotor 2) on the inner peripheral side of the permanent magnet 22, and the outer stator 4 is concentric with the permanent magnet 22 (rotor 2) on the outer peripheral side. Arranged in a shape. That is, the motor 1 </ b> B according to the present embodiment is also configured as a so-called double stator type motor in which the inner stator 3 and the outer stator 4 are disposed to face each other in the radial direction with the permanent magnet 22 interposed therebetween.

  Here, the motor 1B according to the present embodiment is mainly different from the motor 1 of the first embodiment in that the positioning plate 7 is on the side opposite to the inner stator 3 and the outer stator 4 (lower side in FIG. 5). A circuit board (drive circuit board) 9 for driving and controlling the motor 1B is disposed. In addition, the positioning plate 7 in which the inner fitting recess 73 and the outer fitting recess 74 are formed is provided with an opening 76 through which the connection conductors 32a and 42a of the inner winding 32 and the outer winding 42 are inserted. It is different from the motor 1 of the first embodiment.

  As shown in FIG. 5, the openings 76 are provided separately for those through which the connection conductor 32 a of the inner stator 3 is inserted and those through which the connection conductor 42 a of the outer stator 4 is inserted. That is, the opening 76 for the inner stator 3 is formed in the vicinity of the rotation center side of the inner fitting recess 73, and the opening 76 for the outer stator 4 is opposite to the rotation center of the outer fitting recess 74. It is formed in the vicinity of the side.

  In the present embodiment, the circuit board 9 is attached so as to contact the positioning plate 7, and an appropriate space S is provided between the circuit board 9 and the bottom 61 of the casing 6. Further, the circuit board 9 is provided with an opening 91 continuous with the opening 76 described above.

  Also according to this embodiment described above, the same operations and effects as those of the first embodiment can be achieved.

  Moreover, according to this embodiment, the opening part which inserts the connection conducting wires 32a and 42a of the inner side winding 32 and the outer side winding 42 in the positioning board 7 in which the inner side fitting recessed part 73 and the outer side fitting recessed part 74 were formed. 76 is formed. Therefore, the connecting conductors 32 a and 42 a extending from the inner winding 32 of the inner stator 3 and the outer winding 42 of the outer stator 4 are passed through the opening 76 and the positioning plate 7 on which the circuit board 9 is disposed. Can be taken out to the other side. Therefore, wiring of the inner winding 32 and the outer winding 42 is facilitated, and the assembling property of the motor 1B can be improved.

  In the present embodiment, the circuit board 9 is incorporated in the internal space formed by the separation plate 5 and the casing 6. Specifically, the circuit board 9 is arranged on the opposite side of the positioning plate 7. Therefore, since the connection conductors 32a and 42a taken out from the opening 76 can be directly connected to the circuit board 9, the connection conductors 32a and 42a can be shortened, and further miniaturization of the motor 1B can be achieved.

  The configuration according to the present embodiment can be applied to the second embodiment.

(Fourth embodiment)
The motor 1 </ b> C according to the present embodiment basically has the same configuration as that of the third embodiment, and has a rotor (a permanent magnet 22 having a cylindrical permanent magnet 22 around the rotation shaft 21. And at least one rotor 2 that rotates about a rotation shaft 21. The inner stator 3 is arranged concentrically with the permanent magnet 22 (rotor 2) on the inner peripheral side of the permanent magnet 22, and the outer stator 4 is concentric with the permanent magnet 22 (rotor 2) on the outer peripheral side. Arranged in a shape. That is, the motor 1 </ b> C according to the present embodiment is also configured as a so-called double stator type motor in which the inner stator 3 and the outer stator 4 are disposed to face each other in the radial direction with the permanent magnet 22 interposed therebetween.

  Here, the motor 1C according to the present embodiment is mainly different from the motor 1B of the third embodiment in that a fitting recess (fitted part) 73 is provided on the circuit board (drive circuit board) 9A. There is in point. That is, the point which used the circuit board 9A incorporated in the inside of the casing 6 as a positioning member differs from the said 3rd Embodiment.

  In the present embodiment, as shown in FIG. 6, a circuit board 9 </ b> A is formed of a metal substrate that can be bent, and the circuit board 9 </ b> A is disposed between the inner stator 3 and the outer stator 4 and the bottom 61 of the casing 6. is doing. Thus, by using the circuit board 9A as the positioning member, the positioning plate 7 shown in the third embodiment can be avoided.

  The circuit board 9A is disposed so as to contact the bottom 51c of the recessed portion 51 of the separation plate 5, and the outer peripheral portion of the circuit board 9A has a predetermined radial outward from the outer wall 51b of the recessed portion 51. Space S2 is provided and bent in a step shape. And the outward position detection sensor 8B is attached to the vertical wall 9Aa bent in the step shape.

  In the present embodiment, the outer fitting recess 74 (see FIG. 1) is not provided, but the upper step surface 9Aa bent in a step shape contacts the outer stator 4 and the upper step surface 9Aa is used as the outer stator. 4 is positioned in the direction of the rotary shaft 21. That is, the upper surface 9Aa substitutes a part of the fitting recess 74.

  The positioning of the inner stator 3 is performed by the fitting recess 73 having the recess side walls 73a and 73b and the fitting protrusion 71 protruding from the inner stator core 31, as in the first embodiment. In the present embodiment, the fitting recess 73 is formed integrally with the circuit board 9A.

  The circuit board 9 </ b> A has an opening 91 through which the connecting wires 32 a and 42 a of the inner winding 32 and the outer winding 42 are inserted.

  Also according to the present embodiment described above, the same operations and effects as those of the third embodiment can be achieved.

  In this embodiment, the circuit board 9A incorporated in the casing 6 is used as a positioning member, and a fitting recess (fitting part) 73 is provided in the circuit board (drive circuit board) 9A. Therefore, it is not necessary to use the positioning plate 7 as in the third embodiment, the number of parts can be reduced, and a cheaper motor 1C can be obtained.

(Fifth embodiment)
The motor 1D according to the present embodiment basically has the same configuration as that of the first embodiment, and has a rotor (a permanent magnet 22 having a cylindrical permanent magnet 22 centered on the rotating shaft 21; And at least one rotor 2 that rotates about a rotation shaft 21. The inner stator 3 is arranged concentrically with the permanent magnet 22 (rotor 2) on the inner peripheral side of the permanent magnet 22, and the outer stator 4 is concentric with the permanent magnet 22 (rotor 2) on the outer peripheral side. Arranged in a shape. That is, the motor 1 </ b> D according to the present embodiment is also configured as a so-called double stator type motor in which the inner stator 3 and the outer stator 4 are opposed to each other in the radial direction with the permanent magnet 22 interposed therebetween.

  Here, the motor 1D according to the present embodiment is mainly different from the motor 1 of the first embodiment in that the recess side wall 74a of the fitting recess 74 corresponding to the outer stator 4 side is connected to the inner position detection sensor 8A and It exists in the point made into each attachment part of the outer side position detection sensor 8B.

  That is, in the first to fourth embodiments, the inner position detection sensor 8A is arranged separately on the inner stator 3 side, and the outer position detection sensor 8B is arranged separately on the outer stator 4 side. However, in the present embodiment, as shown in FIGS. 7 and 8, both the position detection sensors 8A and 8B have a short length in the direction of the rotation shaft 21 of the inner stator 3 and the outer stator 4 (L1 <L2). It arrange | positions at the outer side stator 4 side. That is, the two position detection sensors 8A and 8B are attached to the outer surface of the recess side wall 74a on the side close to the permanent magnet 22 of the outer fitting recess 74 at a predetermined interval in the circumferential direction.

  At this time, the inner position detection sensor 8 </ b> A is installed according to the advance angle of the inner stator 3, and the outer position detection sensor 8 </ b> B is installed according to the advance angle of the outer stator 4.

  Also according to this embodiment described above, the same operations and effects as those of the first embodiment can be achieved.

  Further, in the present embodiment, both the inner position detection sensor 8A and the outer position detection sensor 8B are attached to the recess side wall 74a of the fitting recess 74 provided on the outer stator 4 side where the length L2 in the direction of the rotation shaft 21 is short. Yes. As a result, it is not necessary to secure a space for attaching the inner position detection sensor 8A on the inner stator 3 side having a long length in the direction of the rotating shaft 21, and the height h1 of the fitting recess 73 on the inner stator 3 side is shortened. can do.

  That is, when the inner position detection sensor 8A is arranged in the fitting recess 73 on the inner stator 3 side, the height h1 of the recess side walls 73a and 73b is increased by the amount necessary for sensor mounting, and the inner stator 3 and the positioning plate The distance between the motor 7 and the motor 7 becomes longer, making it difficult to further reduce the size of the motor.

  On the other hand, in this embodiment, since it is not necessary to provide the inner position detection sensor 8A in the inner fitting recess 73, the height h1 of the recess side walls 73a and 73b of the fitting recess 73 can be reduced. Thereby, the length of the rotating shaft 21 direction of the motor 1D can be shortened. Furthermore, the length of the permanent magnet 22 in the direction of the rotating shaft 21 can be shortened, and the cost can be reduced.

  When the height h1 of the inner fitting recess 73 is lowered, the height h2 of the outer fitting recess 74 is also lowered by that amount, but the length L2 of the outer stator 4 is the length L1 of the inner stator 3. Is shorter. Therefore, it is possible to secure a mounting space for the position detection sensors 8A and 8B on the recess side wall 74a of the outer fitting recess 74. Since the position detection sensors 8A and 8B can be opposed to the permanent magnet 22 by arranging the position detection sensors 8A and 8B on the concave side wall 74a, the position detection of the rotor 2 can be performed as usual. become able to.

  Moreover, it is also possible to apply the structure concerning this embodiment to the said 2nd-4th embodiment.

  Here, the modification of this embodiment is demonstrated based on FIG. In the motor 1D of the present embodiment, as described above, both the inner position detection sensor 8A and the outer position detection sensor 8B are provided on the recess side wall 74a of the outer fitting recess 74. However, the motor 1E according to this modification example. Eliminates the inner position detection sensor 8A and causes the outer position detection sensor 8B to estimate the position of the permanent magnet 22 on the inner stator 3 side.

  That is, the position on the outer stator 4 side of the permanent magnet 22 is detected by the outer position detection sensor 8B as in the above embodiments, while the position on the inner stator 3 side is estimated using the outer position detection sensor 8B. I am doing so.

  Specifically, when the magnetic pole of the permanent magnet 22 is shifted by 90 degrees between the inner periphery and the outer periphery, the commutation timing of the outer winding 42 and the inter-edge period T calculated by a microcomputer (not shown) are used. The position on the inner stator 3 side is estimated by shifting T / 4 from the commutation timing on the stator 4 side and further shifting the advance angle on the inner stator 3 side to obtain the commutation timing on the inner stator 3 side.

  Thus, in this modification, not only the position detection on the outer stator 4 side of the permanent magnet 2 but also the position detection on the inner stator 3 side is performed by the outer position detection sensor 8B. Therefore, it is not necessary to use the inner position detection sensor 8A, the number of sensors can be reduced, a cheaper motor 1E can be obtained, and space can be saved, so that the motor 1E can be further downsized. It becomes possible to plan.

  In addition, it is also possible to apply this modification to the said 1st-4th embodiment.

(Sixth embodiment)
The motor 1F according to the present embodiment basically has the same configuration as that of the fifth embodiment, and has a rotor (a permanent magnet 22 having a cylindrical permanent magnet 22 around the rotating shaft 21; And at least one rotor 2 that rotates about a rotation shaft 21. The inner stator 3 is arranged concentrically with the permanent magnet 22 (rotor 2) on the inner peripheral side of the permanent magnet 22, and the outer stator 4 is concentric with the permanent magnet 22 (rotor 2) on the outer peripheral side. Arranged in a shape. That is, the motor 1F according to the present embodiment is also configured as a so-called double stator type motor in which the inner stator 3 and the outer stator 4 are arranged to face each other in the radial direction with the permanent magnet 22 interposed therebetween.

  Here, the motor 1F according to the present embodiment is mainly different from the motor 1D of the fifth embodiment in that the inner stator 3 and the outer stator 4 are substantially flush with one end surface in the direction of the rotation shaft 21. It is in the point arranged so.

  That is, the fifth embodiment is different from the fifth embodiment in that one of the inner stator core 31 and the outer stator core 41 is shifted in the direction of the rotation axis 21 with respect to the magnetic center of the permanent magnet 22.

  In the present embodiment, the outer stator core 41 of the outer stator 4 whose length L2 in the direction of the rotating shaft 21 is shortened is moved to the side opposite to the direction in which the thrust force is applied (upward in FIG. 10). End surfaces (one end surfaces) 41E and 31E on the opposite side to the acting direction of the thrust force of the inner stator core 31 are arranged on the same plane. As a result, the magnetic center of the outer stator core 41 is shifted from the magnetic center of the permanent magnet 22 to the side opposite to the direction in which the thrust force acts.

  When the motor 1F having such a configuration is used as a drive source of a device such as a pump in which a thrust force constantly acts on the rotating shaft 21, a stator core (in this embodiment, the outer stator core 41) and a permanent magnet whose magnetic center is shifted. An electromagnetic force in the axial direction is generated between And the vibration of the motor 1F can be reduced by utilizing this electromagnetic force as a thrust force presser.

  In addition, when there is a dimensional deviation due to a dimensional error or an assembly error, the eccentricity due to the dimensional deviation causes vibration. That is, when there is an eccentricity due to dimensional deviation, a moment is generated in the rotor 2 by the radial force generated at the magnetic center, and the rotor 2 vibrates. However, the vibration due to the eccentricity can be canceled out by the electromagnetic force in the axial direction, so that the vibration can be further reduced.

  As described above, according to the present embodiment, the same functions and effects as those of the fifth embodiment can be achieved, and the vibration of the motor 1F can be reduced and the noise can be reduced by reducing the vibration. Can also be realized. For this reason, it is possible to suppress an adverse effect caused by vibrations on a device using the motor 1F as a drive source.

  In addition, it is also possible to apply the structure concerning this embodiment to the said 1st-4th embodiment.

(Seventh embodiment)
The motor 1G according to the present embodiment basically has the same configuration as that of the fifth embodiment, and includes a rotor (a permanent magnet 22 having a cylindrical permanent magnet 22 around the rotating shaft 21; And at least one rotor 2 that rotates about a rotation shaft 21. The inner stator 3 is arranged concentrically with the permanent magnet 22 (rotor 2) on the inner peripheral side of the permanent magnet 22, and the outer stator 4 is concentric with the permanent magnet 22 (rotor 2) on the outer peripheral side. Arranged in a shape. That is, the motor 1G according to the present embodiment is also configured as a so-called double stator type motor in which the inner stator 3 and the outer stator 4 are disposed to face each other in the radial direction with the permanent magnet 22 interposed therebetween.

  Here, the motor 1G according to the present embodiment is mainly different from the motor 1D of the fifth embodiment in that the bottom 61 of the casing 6 is used as a positioning member.

  That is, in this embodiment, the positioning plate 7 is not provided, and the inner fitting recess 73 and the outer fitting recess 74 are integrally fixed to the bottom 61 of the casing 6 (see FIG. 11). The bottom 51 c of the recessed portion 51 of the separation plate 5 is in contact with the bottom 61 of the casing 6.

  Also according to this embodiment described above, the same operations and effects as those of the fifth embodiment can be obtained.

  Moreover, according to this embodiment, since the bottom part 61 of the casing 6 was used as a positioning member, the positioning plate 7 becomes unnecessary and the number of parts can be reduced. As a result, a cheaper motor 1G can be obtained. Further, since the inner stator 3 and the outer stator 4 are positioned by the casing 6 covering the motor 1G, more stable positioning can be performed.

  The configuration according to this embodiment can be applied to the first embodiment.

(Eighth embodiment)
In the present embodiment, a pump P using the motor 1B of the third embodiment as a drive source will be described.

  In the pump P according to this embodiment, as shown in FIG. 12, an impeller 100 that sucks and discharges liquid is fixedly supported on a rotor case 23 of a motor 1 </ b> B, and a rotary shaft 21 is attached to the center of the impeller 100. Yes. The rotating shaft 21 is rotatably supported by a shaft support portion 102 formed inside the pump case 101.

  The impeller 100 is rotatably accommodated in a pump chamber 103 formed in the pump case 101. The pump case 101 is provided with a suction port 104 for sucking liquid into the pump chamber 103 and a discharge port 105 for discharging the liquid in the pump chamber 103, and the pump chamber 103 is connected to the pump case 101 and the separation plate 5. It is formed between.

  A control circuit board 9 is arranged on the opposite side of the inner stator 3 and the outer stator 4 from the rotor 2. The circuit board 9 may be covered with a mold resin together with the inner stator 3 and the outer stator 4.

  In the pump P configured as described above, the magnetic flux generated by energizing the inner winding 32 and the outer winding 42 is transmitted from the inner claw magnetic pole 31a and the outer claw magnetic pole 41a to the permanent magnet 22. At this time, the permanent magnet 22 is attracted and repelled, and the permanent magnet 22 is attracted and repelled, whereby the impeller 100 provided integrally with the rotor 2 rotates together with the rotating shaft 21. Then, a pump action is generated as the impeller 100 rotates, and the liquid sucked from the suction port 104 into the pump chamber 103 is pressurized in the pump chamber 103 and then discharged from the discharge port 105.

  Thus, in this embodiment, since the motor 1B is used as the drive source of the pump P, it is possible to obtain the pump P that uses the motor 1B that can achieve further noise reduction and vibration reduction as the drive source. . In addition, the pump P can be made thinner by using the motor 1B that is made thinner. In addition, by using the highly efficient motor 1B with low vibration and noise, the performance of the pump P can be further improved and the cost can be reduced.

  In this embodiment, the motor 1B of the third embodiment is used as the drive source of the pump P. However, the motors 1, 1A, 1C to 1C shown in the first, second, and fourth to seventh embodiments are used. 1G can also be used. Even in this case, similar actions and effects can be achieved.

  In particular, in the present embodiment, since the thrust force constantly acts on the input shaft 21 of the motor when the pump P is operating, it is preferable to use the motor 1F shown in the sixth embodiment.

(Ninth embodiment)
In the present embodiment, a pump driving device equipped with a pump according to the present invention will be described.

  FIG. 13 shows an example of a dishwasher 200 as a pump drive device according to the present embodiment. In this dishwasher 200, water or hot water is supplied from the water supply port 201 to the water storage tank 202. The water or hot water supplied to the water storage tank 202 is sent from the water storage tank 202 to the nozzle 203 by the cleaning pump P 1, and the water or hot water is ejected from the nozzle 203 so as to be arranged in the dishwasher 200. Is supposed to be washed. In this embodiment, the washed water or hot water falls downward and is stored in the water storage tank 202, and is sent again to the nozzle 203 by the cleaning pump P1. Then, after circulating cleaning for a predetermined time, the water in the water storage tank 202 is drained by stopping the cleaning pump P1 and operating the drain pump P2.

  Next, after supplying water or hot water to the water storage tank 202 again from the water supply port 201, the washing pump P1 is operated for a predetermined time to perform rinsing. Thereafter, the washing pump P1 is stopped and the drainage pump P2 is operated to drain the water or hot water in the water storage tank 202. The tableware 204 arranged in the dishwasher 200 is washed by rinsing by repeating the above operation several times.

  Here, in the present embodiment, the pump P (see FIG. 12) using the motor 1B exemplified in the third embodiment as a drive source is used for the washing pump P1 and the drainage pump P2 described above.

  As described above, the washing pump P1 and the drainage pump P2 are configured in the dishwasher 200 according to the present embodiment by using the pump P using the motor 1B of the present invention as a drive source, thereby improving the drive output of the pump. Thus, the dishwasher 200 that can reduce the thickness of the pump and reduce vibration and noise can be obtained at a low cost, and the storage space for the tableware can be expanded by effectively utilizing the shape of the reduced thickness of the pump. Can be planned. In addition, by making the pump thinner, it is possible to improve the mountability of the pump to the dishwasher 200.

  As the pumps P1 and P2, it is also possible to use the pump P using the motors 1, 1A, and 1C to 1G shown in the first, second, and fourth to seventh embodiments as a driving source. Even in this case, similar actions and effects can be achieved.

  Next, a modification of the pump drive device of this embodiment will be described.

  FIG. 14 shows a first modification of the ninth embodiment, and illustrates a case where the pump drive device is a hot water supply unit 300 as a hot water heater.

This hot water supply unit 300 is Ecocute (registered trademark), which is a hot water supply system using a heat pump using CO ₂ as a refrigerant, which can reduce power consumption and is environmentally friendly. FIG. 14 shows a schematic diagram of the system. .

  As shown in FIG. 14, the hot water supply unit 300 includes a heat pump unit 301, a hot water storage unit 302, a bath 303, a floor heating 304, a reheating heat exchanger 305, a heating heat exchanger 306, and the like.

  The hot water supply unit 300 is provided with a hot water faucet 307 for storing a kitchen and a bathroom and an auxiliary tank 308 for accumulating hot water. Is provided with a thermal valve 311. Further, a plurality of mixing valves 312 and safety valves 313 are provided in each pipe.

  And while driving several pumps P4, P5, P6, P7, P8, and controlling each said valve, water and hot water are sent to hot water faucet 307 etc. for bath 303, a kitchen, or a washroom at desired temperature, It can be supplied at a flow rate.

  Here, in this modification, the pumps P (see FIG. 12) using the motor 1B exemplified in the third embodiment as a drive source are used for the above-described pumps P4 to P8.

  As described above, each pump P4 to P8 is configured by using the pump P using the motor 1B of the present invention as a drive source in the hot water supply unit 300 according to the present modification, so that the drive output of the pump is improved and the pump The hot water supply unit 300 can be obtained at low cost, which can reduce the thickness, vibration, and noise. In addition, by reducing the thickness of the pump, it is possible to improve the mountability of the pump to the hot water supply unit 300.

  The pump P of the present invention can be used not only in the hot water supply unit 300 that is an electric water heater using the heat pump described above but also in a gas water heater or a cogeneration system. Further, as the motor used for the pump P, it is possible to use the motors 1, 1A, 1C to 1G shown in the first, second, and fourth to seventh embodiments. Even in this case, similar actions and effects can be achieved.

  FIG. 15 shows a second modification of the ninth embodiment, and illustrates a case where the pump drive device is the washing machine 400.

  In the washing machine 400, the washing tub 401 is rotationally controlled by a motor (not shown). The washing tub 401 is rotated, and water in the washing machine 400 is circulated by the circulation pump P3 to wash clothes and the like. Like to do.

  Here, in this modification, the pump P (see FIG. 12) using the motor 1B exemplified in the third embodiment as a drive source is used as the circulation pump P3. As described above, the circulation pump P3 is configured by using the pump P using the motor 1B of the present invention as a drive source in the washing machine 400 according to the present modification, thereby improving the drive output of the pump and reducing the thickness of the pump. In addition, the washing machine 400 capable of reducing vibration and noise can be obtained at low cost. Further, the laundry tub 401 can be enlarged by effectively utilizing the shape of the thin pump. In addition, by making the pump thinner, it is possible to improve the mountability of the pump in the washing machine 400.

  As the pump P3, it is also possible to use the pump P using the motors 1, 1A, 1C to 1G shown in the first, second, and fourth to seventh embodiments as a driving source. Even in this case, similar actions and effects can be achieved.

  The preferred embodiment of the present invention has been described above, but the present invention is not limited to the above embodiment, and various modifications can be made.

  For example, in each of the above embodiments, the motor is illustrated as having one rotor, one inner stator and one outer stator, but at least one of them is stacked in the direction of the rotation axis. Even so, the present invention can be applied.

  Further, two or more (a plurality) rotors may be provided in the radial direction, and torque may be generated in each rotor by a plurality of stators.

  Further, the inner peripheral side stator, the outer peripheral side stator, and other detailed specifications (shape, size, layout, etc.) can be appropriately changed.

1, 1A, 1B, 1C, 1D, 1E, 1F, 1G Motor 2 Rotor 21 Rotating shaft 22 Permanent magnet 3 Inner stator (multiple stators: inner stator)
31 Inner stator core (stator core)
31E End face (one end face)
32 Inner winding (winding)
32a Connecting conductor 4 Outer stator (multiple stators: outer stator)
41 Outer stator core (stator core)
41E End face (one end face)
42 Outer winding (winding)
42a Connection conductor 7 Positioning plate (positioning member)
71 Inner fitting protrusion (fitting part)
72 Outside fitting convex part (fitting part)
73 Inner fitting recess (fitting part)
74 Outer fitting recess (fitting part)
76 Opening 8A Inner position detection sensor (position detection sensor)
8B Outside position detection sensor (position detection sensor)
9 Circuit board (Drive circuit board)
9A circuit board (drive circuit board: positioning member)
200 Dishwasher (pump drive equipment)
300 Hot water supply unit (pump drive device)
400 Washing machine (pump drive device)
L1 Length of the inner stator in the rotation axis direction L2 Length of the outer stator in the rotation axis direction P Pump

Claims (10)

A motor comprising a plurality of stators having a stator core and windings, and at least one rotor having a permanent magnet and rotating about a rotation axis, wherein the plurality of stators and the rotor are arranged concentrically. In
In the plurality of stators, a length of the outer stator in the direction of the rotation axis is shorter than a length of the inner stator in the direction of the rotation axis.   2. The motor according to claim 1, wherein the plurality of stators are arranged such that one end surfaces of the respective rotation axis directions are substantially on the same plane.   The motor according to claim 1, wherein the rotor and the plurality of stators have substantially the same magnetic center in the rotation axis direction.   The plurality of stators are provided with fitting portions, respectively, and the motor is provided with fitted portions that are fitted into the fitting portions, respectively. The motor of any one of these.   The motor according to claim 4, wherein the fitted portion is provided in a positioning member, and the positioning member is provided with an opening through which the connecting wire of the winding is inserted.   The motor according to claim 4 or 5, wherein a fitting portion of a position detection sensor that performs position control of the rotor is provided in the fitted portion.   The motor according to claim 5 or 6, wherein the positioning member is a drive circuit board, and the fitted portion is provided on the drive circuit board.   The motor according to claim 6 or 7, wherein the position detection sensor is installed in a stator having a short length in the rotation axis direction among the plurality of stators.   A pump using the motor according to claim 1 as a drive source.   A pump driving device comprising the pump according to claim 9.

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