JP2009077600A - Driving motor of washing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a driving motor having a stator flange fitted on the outer periphery of a split stator iron core, which has the high degree of roundness by improving the accuracy of inner diameter of the split stator core. <P>SOLUTION: Clearance grooves absorbing deformation by decreasing the rigidity for a load of a radius direction are provided on a portion as near as possible to the outside the outer periphery of the split stator core. In order to deform the clearance grooves on the entire circumference of the split stator cores contacting the inner diameter of the stator flange, the clearance grooves are disposed on the outer peripheral portion of a portion where the stator flange contacts the outer periphery of the split stator core so that the clearance groove uncontinous in a circumferential direction overlaps with the clearance groove, thereby decreasing the rigidity of the outer peripheral portion. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention uses a split stator core as a stator in a driving motor for a washing machine that directly drives a rotary drum in an outer tub of a washing machine, a stator flange is fitted to the outer periphery of the stator, and a resin including an attachment portion is provided. The present invention relates to a motor for driving a molded washing machine.

  Japanese Patent Application Laid-Open No. 2005-348474 (Patent Document 1) describes a stator that is formed by press-fitting a split stator core into a frame. Further, Japanese Patent No. 3132273 (Patent Document 2) describes a method in which the Young's modulus of the housing into which the stator core is press-fitted is reduced to prevent the displacement of the inner diameter of the fixed core.

JP 2005-348474 A Japanese Patent No. 3132273

  Since the drive motor for driving the rotating drum of the washing machine directly drives the rotating drum, a large driving torque is required. Thereby, the outer dimension of the stator is increased and the number of poles of the rotor is increased. In order to improve the yield of the electromagnetic steel sheet material, the divided stator core constituting the stator uses a divided core. However, since the strength at the joint portion is reduced and the rigidity is lowered as compared with those not divided, the rigidity is increased by fitting with the stator flange. However, since the rigidity of the stator flange is large when the split stator core is press-fitted into the stator flange, the influence of the inner diameter accuracy of the stator flange causes a displacement in the inner diameter of the split stator core. If the stator flange was used as it was, it was difficult to maintain a high roundness of the inner diameter.

  In view of the above-described problems, the present invention provides a drive motor having a high roundness by improving the inner diameter accuracy of the split stator core in a drive motor having a stator flange fitted to the outer periphery of the split stator core. For the purpose.

  When a split stator core is fitted to a stator flange with high rigidity and low inner diameter accuracy, a laminated electrical steel plate is used between the teeth and the outer shape even if a high-precision jig is used for the inner diameter during fitting. Therefore, it is elastically deformed temporarily, and the inner diameter accuracy of the stator flange is restored when the jig is removed, following the jig. For this reason, in the present invention, a clearance groove is provided in the portion of the outer periphery of the split stator core that is as close to the outside as possible to reduce the rigidity against the load in the radial direction and absorb the deformation. Since the escape groove is deformed around the entire circumference of the split stator core that contacts the inner diameter of the stator flange, a clearance groove that is discontinuous in the circumferential direction is formed on the outer periphery of the portion where the outer periphery of the stator flange and the split stator core contacts. The escape groove is arranged so that the escape groove overlaps in the radial direction to reduce the rigidity of the outer peripheral portion.

  According to the present invention, since the rigidity of the outer peripheral portion of the split stator core in contact with the stator flange inner diameter is lowered by the relief groove, when the split stator core is press-fitted into the stator flange, the roundness accuracy is high on the inner diameter. By setting a jig, the displacement at the time of press-fitting is absorbed by the relief groove, and even if a stator flange with a low inner diameter roundness accuracy is used, a split stator core with a high inner diameter roundness can be obtained. .

  Hereinafter, examples according to embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 relates to an embodiment of the present invention, and shows a longitudinal sectional view of a drum type washing and drying machine.

  The outer frame housing includes an outer frame 1 and a base portion 2 that supports the outer frame 1 so as to be placed thereon.

  In addition, there is a case in which an outer frame housing is configured only by the outer frame 1 without the base portion 2.

  The outer frame 1 has a lid 3 that can be opened and closed provided in the center of the front.

  An outer tub 4 made of resin is disposed inside the outer frame 1, and a rotatable rotating drum 5 is disposed in the outer tub 4. The rotary drum 5 is directly connected to the drive motor 7 via the main shaft 6. The drive motor 7 is fixed to a metal flange 8, and the metal flange 8 is fixed to the outer tub 4. At the time of assembly, the rotary drum 5 is assembled after the drive unit assembly in which the main shaft 6 and the drive motor 7 are assembled to the metal flange 8 is assembled to the outer tub 4. In the case of this embodiment, the rotary drum driving motor 7 is a magnet-embedded inner rotor, and the stator uses a DC brushless motor having concentrated windings. A plurality of dewatering holes 10 for dewatering moisture contained in the laundry 9 at high speed during dehydration are provided inside the rotating drum 5.

  The rotating drum 5 is provided with a fluid balancer 11 for reducing unbalance vibration due to the laundry 9 during dehydration.

  In order to seal the washing water between the lid 3 and the outer tub 4, a bellows 12 made of a rubber elastic body is provided.

  The outer tub 4 is supported by two suspensions 13 at the bottom to reduce unbalanced vibration caused by the laundry 9. The suspension 13 supports the outer tub 4 and the total weight attached thereto, and has a strong structure. In addition, a damping mechanism or the like is provided to prevent abnormal vibration caused by resonance of the outer tub 4 that occurs during the dehydration operation.

  Further, the upper part of the outer tub 4 is supported by two tension springs 14 and 15 arranged at the front and rear. These tension springs 14 and 15 are provided to support vibrations that prevent the outer tub 4 from collapsing in the front-rear direction and to reduce vibrations in the front-rear, vertical, and left-right directions during dehydration.

  A drain hose 16 for draining washing water is attached to the base portion 2. In addition, mounting legs 17 are provided at the four corners of the base portion 1. The mounting legs 17 are made of rubber and dampen vibration during operation of the drum type washing and drying machine.

  Although the outer frame housing has the outer frame 1 and the base portion 2, it is possible to provide the mounting legs 17 on the outer frame 1 without providing the base portion 2. In this case, the outer frame 1 becomes an outer frame casing.

  At the time of washing and rinsing, water necessary for washing and rinsing is supplied via a water supply hose 18 connected to a water faucet, a water injection hose 20 connected to a water supply electromagnetic valve 19, and a detergent tray 21.

  The supplied water is stored as washing water at the bottom of the outer tub 4 and as rinsing water at the time of rinsing. The detergent tray 21 is loaded with a detergent necessary for washing, and a rinse finish is poured to improve the finish when rinsing.

  At the time of washing, water supplied from the water injection hose 20 is poured from the upper part of the outer tub 4 through the flexible hose 22 while dissolving the detergent in the detergent tray 21.

  The rotating drum 5 inside the outer tub 4 with the rotational axis centering on the side is opened with the lid 3 placed therein, and the laundry 9 is placed inside. A plurality of lifters 23 are provided inside the rotating drum 5 so that the laundry 9 can be lifted up during washing.

  Water that has become unnecessary after washing and rinsing and water that has been dehydrated from the laundry 9 during dehydration are drained from the drain hose 16 by opening the drain valve 24.

  During drying, the air blown by the blower fan 25 passes through the rotating drum 5 containing the laundry 9 and the outer periphery, and therefore lint is included. Therefore, it is necessary to pass the drying filter 26 without fail.

  For this reason, it blows to the heater 27 via the drying filter 26, and the heated warm air is blown into the rotary drum 5 from the jet port portion 28 provided in the upper part of the outer tub.

  The hot air passes through the laundry 9 and is dehumidified from the rear portion of the rotating drum 5 through the ventilation port 30 of the dehumidifying device 29 provided at the bottom of the outer tub 4 and is repeatedly circulated by the blower fan 25 to dry the laundry 9. Let

  FIG. 2 relates to an embodiment of the present invention, and shows a partial longitudinal sectional view in which a drive unit set is attached to the outer tub 4. The drive unit set 31 is attached to the inner side of the outer tub 4 via a metal flange 8 with an attachment screw 35. The rotating drum side boss portion 32 of the metal flange 8 constituting the drive unit set 31 is press-fitted with a water seal 33 inside, and the outside is covered with rubber. The outer tank boss part 34 is press-fitted into this part, and the outer tank 4 and the drive unit set 31 are sealed so that the washing water does not leak outside. A drive motor side boss portion 37 is provided on the opposite side of the rotating drum side boss portion 32, and bearings 38 and 39 for rotating and supporting the main shaft 6 are accommodated. A rotor 36 is inserted into the main shaft 6 and fixed by a nut 40. A stator 41 is fixed to the metal flange 8 on the outer periphery of the rotor 36 by a mounting screw 42. A motor cover 43 is attached to the stator 41 on the upper surface of the stator 41. A flange 44 for attaching the rotating drum 5 is fitted and fixed to the main shaft 6. Since the gap between the inner diameter of the stator 41 and the outer diameter of the rotor 36 is about 0.6 to 1 mm in this embodiment, the stator 41 and the rotor 36 are easily electrically connected by condensed water or the like. The rotor 41 is used for electrical insulation from the rotor 6.

  FIG. 3 is a longitudinal sectional view of the stator 41 according to the embodiment of the present invention. A stator flange 46 is fitted to the outer periphery of the split stator core 45. The end face of the split stator core 45 is positioned in the axial direction by an end face support portion 47. The length of the end face support 47 is in contact with the end face of the split stator core 45 in a state that is equal to or slightly shorter than the width of the yoke 49. When the end surface support portion 47 is longer than the yoke 49, the winding accommodating portion of the tooth portion 50 is reduced, so that the end surface support portion 47 is equal to or slightly shorter than the yoke 49. Since the split stator core 45 is formed by laminating thin magnetic steel plates, if the outer periphery is strongly pressed, the end face side is deformed. Therefore, the end face support portion 47 is lengthened and the end face of the split stator core 45 is extended. The rigidity is increased by holding down. By making the fitting part on the end face of the stator flange and split stator core up to the outer peripheral part and the yoke of the split stator, the deformation of the end face can be constrained by the load applied to the outer side. The rigidity of the stator core 45 can be increased.

  The split stator core 45 fitted with the stator flange 46 is made of synthetic resin 48, and the end face support portion 47, the yoke 49 and the tooth portion 50 are integrally resin-molded to form an electrically insulating structure that houses the winding 51. is doing. The winding 51 is wound around a tooth portion 50 that is electrically insulated by a synthetic resin 48. It is difficult to maintain accuracy because the roundness of the split stator core 45 alone is easily deformed because the rigidity at the divided portion is small. Therefore, by fitting the stator flange 46, it follows the accuracy of the stator flange 46. Therefore, by increasing the accuracy of the stator flange, resin molding can be performed with increased accuracy and rigidity. For this reason, it is suitable for the shaping | molding of the division | segmentation stator core 45 with many tooth parts 50 which has precision.

  FIG. 4 relates to the embodiment of the present invention, and shows a front view of the stator 41. Six mounting holes 52 formed by resin molding are provided on the outer periphery of the stator flange 46. Thereby, the metal flange 8 and the stator 41 are electrically insulated. A three-phase short-circuit connector 53 and a power connector 54 are simultaneously formed on the upper surface.

  FIG. 5 is a front view of the stator flange 46 according to the embodiment of the present invention. The inner side of the stator flange 46 forms a cylindrical portion 55 in which the outer periphery of the split stator core 45 is fitted in the axial direction. An end surface support portion 47 is formed on the inner diameter side at the tip of the cylindrical portion 55. Twelve detents 56 with semicircular cuts are provided inside the end face support 47. In addition, six mounting holes 57 for mounting the stator 41 are provided. The detent 56 is not very rigid because the outer diameter of the split stator core 45 and the inner diameter portion of the stator flange 46 are fitted with the split core 59, so the stator flange 46 and the split stator core 45 are not connected. By molding with the synthetic resin 48, it does not shift in the rotational direction.

  FIG. 6 relates to an embodiment of the present invention, and shows a longitudinal sectional view of the stator flange 46. On the inside, a cylindrical portion 55 is formed in the axial direction. For this reason, since the section modulus is large in the radial direction, the structure has high rigidity. On the inner side of the cylindrical portion 55, rotation stoppers 56 are formed at equal intervals on the outer peripheral portion.

  FIG. 7 relates to the implementation of the present invention, and shows a front view of the split stator core 45. As shown in FIG. 8, the divided stator iron core 45 is linear and all the divided iron cores 58 are connected in a circular arc shape as shown in FIG. 9, and a plurality of divided iron cores 59 are combined. A split stator core 45 is formed.

  FIG. 8 relates to the implementation of the present invention, and shows a front view of the fully divided core 58. On the outer peripheral side, first relief grooves 64 and first discontinuous portions 65 are alternately arranged in a straight line. In addition, second escape grooves 66 and second discontinuous relief grooves 67 are alternately arranged on the inner side, and one of the relief grooves is always continuous in the radial direction. The shape of the escape groove may be square, rectangular, or circular, but since the magnetic flux flows in the circumferential direction, it is preferable that the cross-sectional area of the yoke 49 is minimized. Regarding the radial width of the relief groove, generally, the minimum width of punching by pressing is limited to the thickness of the laminated material in consideration of mass productivity. Thereby, the lifetime of the punching die by a press can be maintained. Further, since the minimum width of the escape groove is the plate thickness, the roundness accuracy of the inner diameter of the stator flange 46 is in the range of 0.1 to 0.5. Since the effective cross-sectional area of the yoke 49 can be increased by setting the width of the escape groove to the minimum width, the material yield can be improved.

  FIG. 9 relates to the implementation of the present invention, and shows a front view of the split iron core 59. The split core 59 is formed by bending the whole split core 58 into an arc shape. However, even if the material is reduced in yield but the bent shape is not punched and laminated, Good.

  A concave portion 60 and a convex portion 61 are provided on both sides of the split core 59, and a circular split stator core 45 is configured in combination with the concave portion 60 and the convex portion 61 of the split core 59. Further, the split iron core 59 is formed with split holes 62 between the respective tooth portions 50. When the split stator core 45 and the stator flange 46 are resin-molded, the synthetic resin 48 flows through the split holes 62 and the escape grooves in which the space portions remain without being deformed, and the adhesion degree of both end faces can be increased.

  FIG. 10 relates to the embodiment of the present invention, and shows the material removal when all the divided cores 58 are punched out from the magnetic steel sheet by a press. The entire divided iron core 58 is driven by sharing the tooth portion 50 facing the slot 63 as a single space by making the tooth portions 50 face each other in the slot 63 which is the space between the tooth portion 50 and the tooth portion 50. The yield of the material is improved by pulling out. For this reason, the width of the dimension of the tooth part 50 is set to a dimension that the tooth part 50 can share in the space of the slot 63 in a state of being opposed to each other. At this time, the mutual minimum punching width is set to be equal to or greater than the plate thickness from the punching workability of the press.

  FIG. 11 relates to an embodiment of the present invention, and shows a front view of a fully divided core 58 which is another embodiment. On the outer peripheral side, first relief grooves 64 and first discontinuous portions 65 are alternately arranged in a straight line. A width of the outer peripheral relief 68 is formed on the outer periphery of the first discontinuous portion 65 so as to slightly overlap. The depth of the outer peripheral relief 68 is about 0.5 mm.

  FIG. 12 relates to the embodiment of the present invention, and shows a cross-sectional view when the stator flange 46 is press-fitted into the split stator core 45 using a jig. A jig 69 divided to operate in the radial direction is attached to the lower mold 68. The outer diameter of the jig 69 is reduced by attaching the split stator iron core 45 in a state where the jig 69 is small, covering the stator flange 46, and lowering the tape mandrel 71 attached to the upper mold 70. At the same time, the stator flange 46 is pushed and pressed into the split stator core 45. In this method, the outer diameter portion of the split stator core 45 is plastically deformed to maintain the inner diameter accuracy, so that a large load is applied to the inner diameter of the jig 69, but the taper mandrel 71 is attached to the upper mold 70. Therefore, when it moves upward, the inner diameter becomes smaller, and the split stator core 45 into which the stator flange 46 is press-fitted can be easily removed from the jig 69.

  When the split stator core 45 is fitted to the stator flange 46, a fixed dimension jig with improved roundness and inner diameter is inserted into the inner diameter side in a state of being inserted into the inner diameter side. At this time, the inner diameter of the stator flange 46 and the outer diameter of the divided stator core 45 are sure to allow a press-fitting allowance. When the stator flange 46 is press-fitted into the split stator core 45, the rigidity of the stator flange 46 in the radial direction is large, so that the split stator core 45 is displaced by applying an inner diameter side load. Since a jig for restraining the tooth portion 50 is provided on the inner diameter side, the displacement is stopped at the outer periphery of the jig and is absorbed by deformation of the relief groove provided on the outer periphery of the divided stator core 45. The escape groove is deformed toward the inner diameter side at the first escape groove 64, but the first discontinuous portion 65 is not deformed, and the second relief groove 66 immediately below it is deformed and absorbed. That is, with respect to the displacement in the radial direction, the first relief groove 64 and the second relief groove 66 are formed as if they were continuous relief grooves. In the embodiment in FIG. 11, the outer periphery of the first discontinuous portion 65 that is not deformed is provided with the outer periphery relief 68 in advance, so that the displacement of the outer periphery can be absorbed only by the deformation of the first relief groove 64. The difference between the inner diameter accuracy of the stator flange 46 and the jig accuracy becomes a displacement, which is absorbed by the displacement of the relief groove having the lowest rigidity, and the roundness of the inner diameter of the split stator core 45 can be substantially matched to the jig accuracy. it can.

  Since the stator flange 46 and the split stator core 45 are resin-molded by press-fitting, the roundness and inner diameter dimension, which are the inner diameter accuracy, are good, so when setting to the mold of the resin mold, Therefore, the accuracy of the mounting portion 52 can be improved by resin-molding the mounting portion 52 of the stator flange 46 on the basis of the inner diameter.

  In addition, although this drive motor is used for the drum-type washing machine, it may be used for the drum-type washing machine or the vertical washing machine and the vertical washing machine.

1 is a longitudinal sectional view of a drum type washing and drying machine according to an embodiment of the present invention. The partial longitudinal cross-sectional view which concerns on the Example of this invention and the drive part group is attached to the outer tank 4 is shown. FIG. 4 is a longitudinal sectional view of a stator 41 according to an embodiment of the present invention. The front view of the stator 41 which concerns on the Example of this invention is shown. The front view of the stator flange 46 according to the embodiment of the present invention is shown. FIG. 4 is a longitudinal sectional view of a stator flange 46 according to an embodiment of the present invention. The front view of the division | segmentation stator core 45 which concerns on implementation of this invention is shown. The front view of all the division | segmentation iron cores 58 is based on the Example of this invention. The front view of the division | segmentation iron core 59 concerns on the Example of this invention. This relates to the embodiment of the present invention, and shows the material removal when all the divided cores 58 are punched out of a magnetic steel sheet with a press. The front view of the fully divided iron core 58 which concerns on the Example of this invention and is another Example is shown. Sectional drawing when the stator flange 46 is press-fitted into the split stator core 45 using a jig according to the embodiment of the present invention is shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Outer frame 2 Base part 3 Lid 4 Outer tub 5 Rotating drum 6 Main shaft 7 Driving motor 8 Metal flange 9 Laundry 10 Dewatering hole 11 Fluid balancer 12 Bellows 13 Suspension 14, 15 Pull spring 16 Drain hose 17 Mounting leg 18 Water supply hose 19 Water supply solenoid valve 20 Water supply hose 21 Detergent tray 22 Flexible hose 23 Lifter 24 Drain valve 25 Blower fan 26 Drying filter 27 Heater 28 Spout 29 Dehumidifier 30 Ventilation path 31 Drive unit 32 Rotating drum side boss 33 Water seal 34 Outer tank bosses 35, 42 Mounting screw 36 Rotor 37 Driving motor side bosses 38, 39 Bearing 40 Nut 41 Stator 43 Motor cover 44 Flange 45 Split stator core 46 Stator flange 47 End face support 48 Synthetic resin 49 yoke 50 tooth 51 winding 52,5 Mounting hole 53 Three-phase short-circuit connector 54 Power supply connector 55 Cylindrical portion 56 Detent 58 Fully divided core 59 Divided core 60 Recess 61 Projection 62 Divided hole 63 Slot 64 First relief groove 65 First discontinuous portion 66 Second Relief groove 67 second discontinuous portion 68 outer periphery relief

Claims (1)

  The outer tub has a drive unit set for driving the rotating drum, the drive unit set is attached to the outer tub via a metal flange, and the drive motor mounted on the drive unit set has a stator flange. In the motor for a washing machine in which the divided stator core is fitted to the inner diameter, the first relief groove and the first discontinuous portion are provided on the outer peripheral side of the portion where the outer periphery of the stator flange contacts the outer periphery of the divided stator core. Are arranged alternately in a straight line, and on the inside, second relief grooves and relief grooves of the second discontinuous portion are alternately arranged, and either relief groove is always continuous in the radial direction. A motor for driving a washing machine.

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