JP5927432B2 - Motor and pump equipped with the same - Google Patents

Description

  The present invention relates to a motor that is rotationally driven by a magnetic field generated by a stator, and a pump including the motor.

  Conventionally, a stator of this type of motor has a yoke portion concentrically arranged with respect to a rotation axis of a rotor provided with a magnet, and a side surface of the yoke portion that faces the outer peripheral surface of the rotor. And a stator core having a plurality of teeth portions around which the coils are wound, and a magnetic pole portion provided on the tip side of the teeth portions and disposed opposite to the outer peripheral surface of the rotor. .

  The stator core is formed by laminating a plurality of plate materials in the axial direction of the rotational axis of the rotor, and is formed by further laminating a plurality of plate materials at the axial end of the magnetic pole portion. An extended portion is provided.

  With the above configuration, the motor can be reduced in size by accommodating the coil wound around the tooth portion in the stacking direction of the extension portion (see, for example, Patent Document 1).

  Further, in the stator core not provided with the extension portion, the stator core has an insulating portion that insulates the coil and the tooth portion, and the left insulating portion is disposed so as to face the magnetic pole portion along the axial direction. The magnetic pole portion is extended so as to protrude from the end portion in the axial direction, and a notch having a shape corresponding to the magnetic pole portion is provided on a surface facing the magnetic pole portion to be fitted to the magnetic pole portion. I am doing so.

  With the above configuration, both sides of the end face in the axial direction of the magnetic pole part are sandwiched by the insulating part to prevent a decrease in strength of the magnetic pole (for example, see Patent Document 2).

JP 2004-328971 A Japanese Patent Application Laid-Open No. 2012-070517

  However, in the conventional configuration, first, the configuration of Patent Document 1 does not disclose the means for fixing the extension portion to the magnetic pole. Therefore, a force acting on the extension portion, for example, a coil is applied to the yoke portion. It is conceivable that the extension portion is deformed when a stress is applied from the coil to the extension portion or an electromagnetic force is generated by the magnet of the coil or the rotor.

  For this reason, there is a possibility that the motor characteristics may change during operation of the motor, and noise or vibration may occur.

  Further, when the technique of Patent Document 2 is applied to Patent Document 1 as a means for fixing the extension part, the dimensional tolerance as a member in the extension part and the insulating part arranged to face the extension part, In some cases, it may be difficult to stably fix the extension due to variations in positioning during assembly.

  Further, since the insulating portion needs to be extended so as to protrude from the end portion in the axial direction of the magnetic pole portion, there is a problem that the motor becomes large.

  The present invention solves the above-mentioned conventional problems, and has a high motor efficiency by stably fixing the extension to the magnetic pole without being affected by dimensional tolerances of members or variations in positioning during assembly. An object is to provide a small motor with low noise and vibration.

  In order to solve the above-described conventional problems, a motor of the present invention includes a stator that is wound with a coil to generate a magnetic field, and a rotor that is provided with a magnet and is driven to rotate by the magnetic field generated by the stator. The rotor includes an outer peripheral surface along the rotation direction.

  The stator includes a yoke portion concentrically arranged with respect to the rotation axis of the rotor, and a protrusion projecting from the side surface of the yoke portion facing the outer peripheral surface of the rotor toward the outer peripheral surface. A plurality of teeth portions wound around, an insulating portion that insulates the coil from the teeth portions, and a magnetic pole portion that is provided on the distal end side of the teeth portions and is disposed opposite to the outer peripheral surface of the rotor. A stator core is provided.

  Further, the stator core is formed by laminating a plurality of plate materials in the axial direction of the rotation axis of the rotor, and further laminating a plurality of plate materials at the axial end portion of the magnetic pole portion. A first notch portion in which a part of the plurality of plate members of the extension portion is cut out is provided on the coil side of the end portion in the axial direction of the extension portion.

  In addition, the insulating part is formed on the coil side of the extension part so as to extend along the axial direction of the extension part, and protrudes toward the extension part at the tip of the extension part. A protrusion inserted into the first notch, and a surface facing the end surface in the axial direction of the teeth portion of the insulating portion is directed from the end portion on the extension portion side toward the yoke portion. A second cutout portion is formed by cutting out the facing surface.

  As a result, the insulating part is accommodated in the stacking direction of the extension part, so that the motor is not enlarged, and the extension part is connected to the magnetic pole without any dimensional tolerance of the member or variation in positioning during assembly. It can be stably fixed to the part.

  The motor of the present invention can be a small motor having high motor efficiency, low noise and low vibration.

The partial perspective view of the stator of the motor in Embodiment 1 of the present invention Sectional drawing of the stator of the motor in Embodiment 1 of this invention The partial perspective view of the stator of the motor in Embodiment 2 of the present invention Sectional drawing of the stator of the motor in Embodiment 2 of this invention Sectional drawing of the pump provided with the motor in Embodiment 3 of this invention

  1st invention has a stator which a coil is wound and generate | occur | produces a magnetic field, and a rotor provided with a magnet and rotationally driven by the magnetic field which generate | occur | produced in the said stator, The said rotor followed the rotation direction A motor having an outer peripheral surface.

  The stator includes a yoke portion concentrically arranged with respect to the rotation axis of the rotor, and a protrusion projecting from the side surface of the yoke portion facing the outer peripheral surface of the rotor toward the outer peripheral surface. A plurality of teeth portions wound around, an insulating portion that insulates the coil from the teeth portions, and a magnetic pole portion that is provided on the distal end side of the teeth portions and is disposed opposite to the outer peripheral surface of the rotor. A stator core is provided.

  Further, the stator core is formed by laminating a plurality of plate materials in the axial direction of the rotation axis of the rotor, and further laminating a plurality of plate materials at the axial end of the magnetic pole portion. A first notch portion in which a part of a plurality of plate members of the extension portion is cut out is provided on the coil side of the end portion in the axial direction of the extension portion.

  In addition, the insulating part is formed on the coil side of the extension part so as to extend along the axial direction of the extension part, and protrudes toward the extension part at the tip of the extension part. A protrusion inserted into the first notch, and a surface facing the end surface in the axial direction of the teeth portion of the insulating portion is directed from the end portion on the extension portion side toward the yoke portion. The second cutout portion is formed by cutting out the facing surface.

  As a result, the extension part is accommodated in the stacking direction of the extension part so that the motor is not enlarged, and the extension part can be connected to the magnetic pole part without any dimensional tolerance of the member or variations in positioning during assembly. By being fixed stably, a small motor having high motor efficiency, low noise and low vibration can be obtained.

  According to a second invention, in particular, in the motor according to the first invention, the insulating portion includes at least the extension portion and the protrusion at a center portion in the rotation direction of the rotor. It is divided into two.

  As a result, when the coil is wound around the insulating portion, the protrusion provided on the insulating portion is rotated from the axial direction to the rotational direction with respect to the extension portion by pressure from the coil to the insulating portion. By applying pressure in the direction inclined to the angle, the extension portion can be more stably fixed not only in the axial direction but also in the rotational direction.

  In particular, the third invention includes a separation plate that divides the stator and the rotor after the motor of the first or second invention is provided, and the stator side of the separation plate includes the stator. The pump is provided with a molding material that covers the surface.

  Accordingly, when the stator is covered with the molding material when the pump is assembled, even if a stress is applied to the extension portion from the molding material, the extension portion can be prevented from being deformed. A small pump having low noise and vibration can be provided.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
1 and 2 show a partial perspective view and a cross-sectional view of a stator 1 of a motor according to Embodiment 1 of the present invention.

As shown in FIGS. 1 and 2, the motor of the present invention is provided with a stator 1 around which a coil 14 is wound to generate a magnetic field, and a magnet 1 a, and is rotationally driven by the magnetic field generated in the stator 1. And the rotor 261 has an outer peripheral surface 2 along the rotation direction.
63.

  The stator 1 includes a yoke portion 115 arranged concentrically with respect to a fixed shaft 27 serving as a rotation axis of the rotor 261, and a side surface of the yoke portion 115 that faces the outer peripheral surface 263 of the rotor 261. And a plurality of teeth 111 around which the coil 14 is wound.

  Furthermore, an insulating portion 12 that insulates the coil 14 from the tooth portion 111, and a magnetic pole portion 112 that is provided on the distal end side of the tooth portion 111 and is disposed to face the outer peripheral surface 263 of the rotor 261. The stator core 11 is provided.

  The stator core 11 is formed by laminating a plurality of plate members in the axial direction of the fixed shaft 27 of the rotor 261 and then fixing by, for example, fitting by caulking.

  The axial end of the magnetic pole portion 112 is further provided with an extension portion 113 formed by further laminating a plurality of plate materials and fixing each plate material by adhesion, for example. On the side of the coil 14 at the end in the axial direction of 113, a first notch 114 is formed by notching a part of the plurality of plate members of the extension 113.

  The insulating portion 12 is formed of an insulating resin material such as PBT (Polybutylene terephthalate), and extends to the coil 14 side of the extending portion 113 along the axial direction of the extending portion 113. The extending portion 121 is provided, and the protruding portion 122 is formed at the distal end of the extending portion 121 so as to protrude toward the extending portion 113 and is fitted into the first cutout portion 114.

  Here, as shown in FIG. 2, a small gap is provided between the axial side surface of the extension portion 113 and the axial side surface of the extension portion 121.

  On the surface of the insulating portion 12 that faces the end surface in the axial direction of the tooth portion 111, a second cutout portion 13 is formed by cutting out the facing surface from the end portion on the extension portion 113 side toward the yoke portion 115. Is provided.

  By providing the second notch portion 13, as shown in FIG. 2, the stator core 11 and the insulating portion 12 have a first notch portion 114 of the extension portion 113 in the axial direction, and The contact is made only at the yoke portion 115.

  The operation and effect of the stator 1 configured as described above will be described below.

  When the coil 14 is wound around the insulating portion 12 at the time of manufacture, the coil 14 is wound while a tensile force is applied to the coil 14. Produces a strong pressing force A (in the direction of the arrow in FIG. 2) in the inner circumferential direction of the coil 14, that is, in the direction of the surface facing the teeth portion 111.

  At this time, the pressing force A acts on the first cutout portion 114 of the extension 113 and the yoke portion 115 that are in contact with the insulating portion 12.

  Therefore, a strong fixing force B (in the direction of the arrow in FIG. 2) acts on the inside of the first notch 114 from the axial end surface due to the pressing force A.

Further, the first notch 114 is configured to be fitted into the protrusion 122 of the insulating part 12, thereby allowing the contact surface between the first notch 114 and the protrusion 122 to be contacted. When the frictional force is applied, the fixing force B is more strongly applied to the extension portion 113, and the plate material stacked on the extension portion 113 is firmly fixed to the magnetic pole portion 112.

  As described above, in the present embodiment, the portion excluding the distal end portion of the extension portion 113 is firmly fixed by the winding force of the driving coil, and the insulating portion is also connected to the first notch portion 114 at the distal end portion. By inserting the 12 extending portions 121, fixation by frictional force can be performed.

  Therefore, since the insulating portion 12 is accommodated in the stacking direction of the extension portion 113, the extension portion 113 can be connected to the magnetic pole portion 112 without increasing the size of the motor and without being affected by the dimensional tolerance or the positioning tolerance. By fixing firmly, a small motor having high motor efficiency, low noise and low vibration can be provided.

(Embodiment 2)
3 and 4 show a partial perspective view and a radial sectional view of the stator 1 of the motor according to the second embodiment of the present invention.

  Here, only matters different from the first embodiment will be described, and the description of the first embodiment is used for those having the same configuration, operational effects, and the like.

  The difference between the second embodiment of the present invention and the first embodiment is that the extending portion 121 and the protrusion 122 of the insulating portion 12 are axially central portions of the fixed shaft 27 when viewed from the yoke portion 115 side. The slits 123 are divided into two (left and right directions in FIG. 4) with respect to the rotational direction of the rotor 261.

  At this time, the side wall portion 124 provided in the rotating direction of the rotor 261 in the insulating portion 12 is formed so as to gradually spread from the connecting portion with the top surface portion 125 in the insulating portion 12 in the axial direction. ing.

  With the above configuration, the pressing force generated when the coil 14 is wound acts on the side wall portion 124 of the insulating portion 12, whereby the side wall portion 124 bends toward the center side of the tooth portion 111 (in FIG. 4). Arrow direction). And the extending portion 121 and the protruding portion 122 are integrated into a fan shape.

  As described above, the portion C of the insulating portion 12 facing the magnetic pole portion 112 formed integrally with the side wall portion 124 similarly generates a force C that is bent toward the center of the tooth portion 111, but the extension divided by the slit 123 is also generated. Contrary to the above, the installation part 121 and the protrusion 122 are deformed so as to spread outside the teeth part 111.

  Therefore, the axial direction and the rotation direction of the rotor 261 or the rotation direction opposite to the rotation direction of the rotor 261 with respect to the first notch portion 114 on the contact surface of the protrusion 122 with the inside of the first notch portion 114. A fixing force D (direction of an arrow in FIG. 4) in an oblique direction is applied.

  As described above, in the present embodiment, the first notch 114 of the extension 113 is aligned with the axial direction and the rotation direction of the rotor 261 or the opposite side to the rotation direction by the fixing force D. By pressing in an oblique direction, the plate material stacked on the extension portion 113 can be more firmly fixed to the magnetic pole portion 112.

Therefore, since the insulating portion 12 is accommodated in the stacking direction of the extension portion 113, the extension portion 113 can be made to move by the magnetic pole portion 112 without increasing the size of the motor and without being affected by dimensional tolerance or positioning tolerance. By fixing firmly, it is possible to provide a small motor having extremely high motor efficiency, low noise and low vibration.

(Embodiment 3)
FIG. 5 shows a cross-sectional view of the motor and the pump 2 including the motor according to the third embodiment of the present invention. Here, only matters different from the first or second embodiment will be described, and the description of the first or second embodiment will be cited for those having the same configuration, operational effects, and the like.

  The third embodiment of the present invention is different from the first or second embodiment in that a pump 2 using the motor of the present invention as a drive source is configured.

  As shown in FIG. 5, in the pump 2, a pump case 21 provided with a suction port 211 for sucking liquid and a discharge port 212 for discharging sucked liquid, and a separation plate disposed to face the pump case 21. A pump chamber 23 is formed between the two.

  Housed in the pump chamber 23 is an impeller 26 that increases the pressure of the liquid sucked from the suction port 211 and discharges it from the discharge port 212.

  The impeller 26 is formed integrally with the rotor 261, and the rotor 261 includes a bearing 262 on the inner peripheral side, and the bearing 262 serves as a rotational axis disposed on the inner peripheral side. Thus, the impeller 26 formed integrally with the rotor 261 is configured to be rotatable.

  The stator 1 is disposed on the outer peripheral side of the separation plate 22, and the impeller 26 is rotationally driven by the magnetic force generated in the stator 1 acting on the rotor 261.

  Further, the pump chamber 23 and the stator 1 are partitioned by the separation plate 22 so that the liquid in the pump chamber 23 does not flow out to the stator 1 side. Further, a control board 24 for driving the motor is disposed on the opposite side of the pump chamber 23 with the separation plate 22 in between. A molding material 25 made of a thermosetting resin is provided so as to cover the separation plate 22, the stator 1, and the control substrate 24.

  Further, the stator 1 of the present embodiment has the configuration of the first or second embodiment.

  As described above, in this embodiment, when the stator 1 is covered with the molding material 25 during the assembly of the pump 2, when stress is generated from the molding material 25 to the extension 113, The protrusion 122 of the insulating part 12 fitted into the first notch 114 of the extension 113 can prevent the extension 113 from being deformed by the fixing force acting on the first notch 114.

  Therefore, a small pump having high motor efficiency, low noise and low vibration can be provided.

  As described above, the motor according to the present invention can be a small motor having high motor efficiency and low noise and low vibration. For example, a pump for a hot water supply device, a pump for a dishwasher, and a washing machine It can also be applied to motors used in machine pumps.

DESCRIPTION OF SYMBOLS 1 Stator 1a Magnet 11 Stator core 111 Teeth part 112 Magnetic pole part 113 Extension part 114 First notch part 115 Yoke part 12 Insulation part 121 Extension part 122 Projection part 123 Slit 124 Side wall part 13 Second notch part 14 Coil 2 Pump 21 Pump case 211 Suction port 212 Discharge port 22 Separator plate 23 Pump chamber 24 Control board 25 Mold material 26 Impeller 261 Rotor 262 Bearing 263 Outer peripheral surface 27 Fixed shaft

Claims (3)

A stator around which a coil is wound to generate a magnetic field, and a rotor provided with a magnet and driven to rotate by the magnetic field generated by the stator, the rotor having an outer peripheral surface along the rotation direction; The stator is formed so as to protrude from the side of the yoke part concentrically arranged with respect to the rotational axis of the rotor and the side of the yoke part facing the outer peripheral surface of the rotor toward the outer peripheral surface. A plurality of teeth portions to be rotated; an insulating portion that insulates the coil from the teeth portions; and a magnetic pole portion that is provided on a distal end side of the teeth portions and is disposed to face the outer peripheral surface of the rotor. In the motor provided with the stator core, the stator core is formed by laminating a plurality of plate members in the axial direction of the rotation axis of the rotor, and a plurality of plates at the end of the magnetic pole portion in the axial direction. A first cutout portion in which a part of the plurality of plate members of the extension portion is cut out on the coil side of the end portion in the axial direction of the extension portion. The insulating portion is formed by extending the extending portion along the axial direction on the coil side of the extending portion, and projecting toward the extending portion side at the distal end of the extending portion. A protrusion that fits into the notch, and the surface of the insulating portion facing the end surface in the axial direction of the extension portion from the end portion on the extension portion side to the yoke portion. A motor having a second notch portion with the opposite surface cut away. 2. The insulation part according to claim 1, wherein at least the extension part and the protrusion part are divided into two parts with respect to the rotation direction at a central part in the rotation direction of the rotor. motor. 3. The motor according to claim 1, further comprising: a separation plate that divides the stator and the rotor, and a molding material that covers the stator is provided on the stator side of the separation plate. Equipped pump.