JP2009112067A - Mold motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mold motor which does not allow water to infiltrate from a section where a bushing or a wiring board is attached. <P>SOLUTION: A through-hole 46 in the bushing 42 made of rubber is made larger than the outside diameter of a lead wire 44, and a protrusion 48 is projected from inside the through-hole 46 so as to press the lead wire 44. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a molded motor.

Conventionally, a mold motor is used as an indoor unit of an air conditioner, a fan motor for an outdoor unit, or the like. In this mold motor, a stator is molded with a mold resin to form a frame, and a rotor is rotatably arranged on the inner peripheral side of the frame (see, for example, Patent Document 1).
JP 2007-166813 A

  A bushing for pulling out a lead wire from a stator or a wiring board is attached to the mold motor. This bushing is also integrally formed with the stator and the wiring board by a mold resin.

  However, with such a configuration, there is a problem that moisture and the like easily enter from the gap and interface between the frame and the bushing or between the bushing and the lead wire.

  Therefore, conventionally, there has been a problem that secondary processing such as application of a sealing material and application of a tape or the like is necessary for waterproofing.

  In addition, when the wiring board is integrally molded inside the frame, it is necessary to attach the wiring board to the mold to prevent deformation and movement of the wiring board. Therefore, a pin is erected from the mold, and a wiring board is placed on the pin to prevent deformation and movement.

  However, there is a problem that after the product is completed, there is a pin hole in the frame, so that water can enter from the hole, or the water can penetrate through the interface between the circuit board and the frame to the back of the circuit board. There is a point.

  Therefore, in this case as well, there is a problem that secondary processing of applying a sealing material and sticking a sheet is necessary as described above.

  Therefore, in view of the above problems, the present invention provides a molded motor in which water does not enter from a bushing or a wiring board mounting portion.

  The invention according to claim 1 is a mold motor in which a stator is molded with a mold resin to form a frame, and a bushing for drawing a lead wire from the frame to the outside is integrally formed with the frame, wherein the bushing is an elastic body It is a mold motor.

  According to a second aspect of the present invention, a through hole through which the lead wire penetrates in the bushing is formed larger than a diameter of the lead wire, and a protrusion that presses the lead wire from an inner periphery of the through hole is formed. The molded motor according to claim 1.

  The invention according to claim 3 is the molded motor according to claim 1, wherein a groove is formed along an outer peripheral portion of the bushing, which is a portion in contact with the outer wall of the frame.

  The invention according to claim 4 is the molded motor according to claim 1, wherein the bushing is compressed by the mold when the bushing is integrally formed with the frame by a mold.

  According to a fifth aspect of the present invention, there is provided a molded motor in which a stator is molded with a mold resin to form a frame, and a bushing for drawing a lead wire from the frame to the outside is integrally formed with the frame. And a molded motor in which an elastic body is attached around the bushing outside the frame.

  According to a sixth aspect of the present invention, there is provided a molded motor in which a stator is molded with a mold resin to form a frame, and a bushing for drawing a lead wire from the frame to the outside is integrally formed with the frame. And a molded motor in which an elastic body is attached to a lead-out portion of the lead wire in the bushing inside the frame.

  The invention according to claim 7 is a molded motor in which a stator is molded with a mold resin to form a frame, and a bushing for drawing a lead wire from the frame to the outside is integrally formed with the frame, wherein the bushing is a synthetic resin And a rib is formed on the outer periphery of the bushing inside the frame.

  According to an eighth aspect of the present invention, in the molded motor in which the stator and the wiring board are molded with a mold resin to form a frame, the support member for supporting the wiring board on the mold is It is a molded motor which protrudes from a wiring board, the support member is an elastic body, and is compressed by the frame.

  According to the present invention, water does not enter from the bushing or the mounting portion of the wiring board.

(First embodiment)
Hereinafter, a molded motor 10 according to a first embodiment of the present invention will be described with reference to FIGS. 1, 2, and 14.

  The mold motor 10 is a brushless DC motor.

(1) Structure of Mold Motor 10 The structure of the mold motor 10 will be described based on FIG.

  An insulating layer 14 is formed by pre-molding the stator core 12 on which the steel plates are laminated, and a coil 16 is wound around the insulating layer 14. As a result, a ring-shaped stator 18 is formed.

  A wiring board 20 made of a donut-shaped printed wiring board is provided on the output side surface of the stator 18. The wiring board 20 is supported on a support wall formed by the insulating layer 14. Electronic components that drive the mold motor 10 are attached to the wiring board 20. Since the mold motor 10 is a brushless DC motor, electronic components such as an inverter circuit and a logic circuit are attached to perform PWM control. Further, a support member 50 to be described later is attached to the wiring board 20.

  A lead wire 44 extends from the wiring board 20, and a bushing for pulling out the lead wire 44 to the outside is provided.

  The wiring board 20, the stator 18, and the bushing 42 are integrally formed with a mold resin to form the frame 22. The frame 22 is cylindrical, and a metal bracket 24 is integrally embedded on the output side surface. The inner peripheral side of the output side bracket 24 is exposed from the frame 22.

  A rotor 26 is accommodated on the inner peripheral side of the frame 22. As shown in FIG. 1, the rotor 26 includes a rotor portion 36 made of an integrally molded plastic magnet, and a rotating shaft 28 that is simultaneously fixed when the rotor portion 36 is integrally formed. And after integrally forming such a rotor 36, the outer peripheral part of the rotor part 36 is alternately magnetized by the magnet in the S pole and the M pole.

  A rotating shaft 28 of the rotor 26 is attached to a metal bracket 34 on the counter-output side via a ball bearing 30. The bracket 34 is fitted to the surface of the frame 22 on the side opposite to the output side. Further, the rotary shaft 28 on the output side of the rotor 26 is attached to the metal bracket 24 on the output side via a ball bearing 30.

  Rubbers 38 and 40 for preventing vibration are attached to the output side and the non-output side of the frame 22.

(2) Structure of Bushing 42 Next, the structure of the bushing 42 will be described with reference to FIG.

  The bushing 42 leads the lead wire 44 extending from the wiring board 20 to the outside of the frame 22 as described above. The bushing 42 is made of an elastic member such as rubber, and is provided with a through hole 46 through which the lead wire 44 passes. Note that a plurality of through holes 46 are provided when a plurality of lead wires 44 are pulled out to the outside.

  The through hole 46 is formed to be larger than the diameter of the lead wire 44, and a protrusion 48 projects from the inner peripheral portion of the through hole 46 as shown in FIG. As shown in FIG. 2, the protrusion 48 is inclined toward the frame 22 and presses the lead wire 44. That is, when the bushing 42 is integrally formed with the mold resin, the bushing 42 is an elastic member and is compressed, and the protrusion 48 is also compressed to the inner peripheral side to press the lead wire 44.

  Thus, when the protrusion 48 presses the lead wire 44, the water entering from the outside of the frame 22 can be blocked by the protrusion 48, and the waterproofness can be improved.

  Moreover, since the bushing 42 is an elastic member, it is compressed as a whole at the time of molding, exhibits a packing effect, and can improve waterproofness. That is, no gap or the like is generated between the frame 22 and the bushing 42, and water does not enter from the interface.

(3) Structure of Support Member 50 Next, the structure of the support member 50 will be described with reference to FIG.

  When the wiring board 20 is molded, it is necessary to place the wiring board 20 on a mold and prevent deformation or movement by molding resin during molding. Therefore, a columnar support member 50 is projected from the wiring board 20 as shown in FIG. The support member 50 is made of an elastic member such as rubber.

  When molding is performed simultaneously with the stator 18, the wiring substrate 20 is fixed by the support member 50, so that deformation and movement can be prevented.

  In addition, after the molding, the support member 50 is compressed as shown in FIG. 14, and water does not enter the frame 22 from the portion of the support member 50. Therefore, it is not necessary to waterproof the wiring board 20.

(Second Embodiment)
Next, the mold motor 10 of the second embodiment will be described with reference to FIG. The difference between the present embodiment and the first embodiment is the structure of the bushing 42.

  In this embodiment, the groove | channel 52 is provided along the outer peripheral part of the bushing 42 which consists of elastic bodies. The outer wall of the frame 22 is positioned in the groove 52.

  As a result, the mold resin enters the groove 52 and surrounds the bushing 42. For this reason, there is no gap between the bushing 42 and the frame 22, and water does not enter from the interface.

(Third embodiment)
Next, the molded motor 10 of 3rd Embodiment is demonstrated based on FIG. 4 and FIG. The difference between the present embodiment and the first embodiment is the structure of the bushing 42.

  In the present embodiment, the through hole 46 through which the lead wire 44 penetrates is formed to have substantially the same diameter as the lead wire 44.

  When the bushing 42 is molded, the bushing 42 is compressed from above and below by the upper mold 54 and the lower mold 56. Then, as shown in FIG. 4, the portion of the bushing 42 protruding from the upper mold 54 and the lower mold 56 is not compressed. Mold resin flows into the uncompressed portion to form the frame 22.

  Then, as shown in FIG. 5, the frame 22 is formed, and when the upper mold 54 and the lower mold 56 are removed, the portion that has been compressed so far returns to its original state and swells. Therefore, a groove 58 is formed in the outer wall portion of the frame 22.

  By doing in this way, since the groove | channel 58 is formed in the outer peripheral part of the bushing 42, and the flame | frame 22 has covered the part, water etc. do not penetrate | invade.

(Fourth embodiment)
Next, a molded motor 10 according to a fourth embodiment will be described with reference to FIGS. 6 and 7. The difference between the present embodiment and the first embodiment is the structure of the bushing 42.

  Unlike the first embodiment, the bushing 42 is formed of a synthetic resin, and is molded as in the conventional case. At this time, the recess 60 is also formed by molding at the same time. After the molding, a ring-shaped waterproof member 62 is fitted into the formed recess 60. Then, the waterproof member 62 made of an elastic member such as rubber is attached to the outer peripheral portion of the bushing 42, and water does not enter from that portion.

(Fifth embodiment)
Next, the molded motor 10 of 5th Embodiment is demonstrated based on FIG. The difference between the present embodiment and the first embodiment is the attachment structure of the bushing 42.

  In this embodiment, the bushing 42 is made of a synthetic resin, and the bushing 42 protrudes from the frame 22 after molding.

  After molding, as shown in FIG. 8, a sheet-like waterproof member 64 made of an elastic member such as rubber is attached around the bushing 42 protruding from the frame 22 with an adhesive or the like.

  Thereby, water does not enter from the gap between the bushing 42 and the frame 22.

  As a modification of the fifth embodiment, as shown in FIG. 9, a waterproof member 64 may be attached so as to cover all portions of the bushing 42 protruding from the frame 22.

(Sixth embodiment)
A molded motor 10 according to a sixth embodiment will be described with reference to FIG. The difference between the present embodiment and the first embodiment is the structure of the bushing 42.

  In this embodiment, the bushing 42 is made of a synthetic resin, and a waterproof member 66 made of an elastic member such as rubber is attached to the lead portion of the lead wire 44 in the inner portion of the frame 22. A through hole 46 is provided so as to penetrate the bushing 42 and the waterproof member 66, and a lead wire 44 is disposed. The waterproof member 66 is attached so as to penetrate into the bushing 42.

  In the case of molding, the bushing 42 and the waterproof member 66 are attached and then molded integrally.

  Thereby, water does not enter from the gap or the interface portion between the bushing 42 and the lead wire 44.

  As shown in FIG. 11, the waterproof member 66 may be attached only to the opening portion of the bushing 42, or as shown in FIG. 12 so as to cover the entire surface of the opening portion.

(Seventh embodiment)
Next, the molded motor 10 of 7th Embodiment is demonstrated based on FIG. The difference between this embodiment and the first embodiment is the structure and material of the bushing 42.

  In the present embodiment, the bushing 42 is made of a synthetic resin that melts at a low temperature, and two ribs 68 protrude from the outer periphery of the bushing 42 at a predetermined interval.

  When molding is performed with the rib 68 protruding from the bushing 42 in this manner, the rib 68 is melted by the heat of the mold resin, and the degree of adhesion of the interface portion between the mold resin and the rib 68 can be increased. Therefore, the rib 68 can prevent water from entering.

It is a longitudinal cross-sectional view of the mold motor of the 1st Embodiment of this invention. It is the enlarged view of a bushing similarly. It is an enlarged view of the bushing of 2nd Embodiment. It is explanatory drawing when molding the bushing of 3rd Embodiment. It is an enlarged view of the bushing of 3rd Embodiment. It is an enlarged view of the bushing of 4th Embodiment. It is the enlarged view of a bushing similarly seen from the front. It is an enlarged view of the bushing of 5th Embodiment. It is an enlarged view of the bushing of the example of a change of 5th Embodiment. It is an enlarged view of the bushing of 6th Embodiment. It is an enlarged view of the bushing of the modification 1 of 6th Embodiment. It is an enlarged view of the bushing of the modification 2 of 6th Embodiment. It is an enlarged view of the bushing of 7th Embodiment. It is an enlarged view of the wiring board in the mold motor of the first embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Mold motor 42 Bushing 44 Lead wire 46 Through-hole 48 Projection part 50 Support member

Claims (8)

In a molded motor in which a stator is molded with a mold resin to form a frame, and a bushing for drawing a lead wire from the frame to the outside is integrally molded with the frame.
The bushing is an elastic body;
Molded motor. A through hole for the lead wire to pass through the bushing is formed larger than the diameter of the lead wire;
A protrusion is formed to press the lead wire from the inner periphery of the through hole.
The molded motor according to claim 1. It is a part in contact with the outer wall of the frame, and a groove is formed along the outer periphery of the bushing.
The molded motor according to claim 1. The bushing is compressed by the mold when the bushing is integrally formed with the frame by a mold.
The molded motor according to claim 1. In a molded motor in which a stator is molded with a mold resin to form a frame, and a bushing for drawing a lead wire from the frame to the outside is integrally molded with the frame.
The bushing is a synthetic resin;
An elastic body is attached around the bushing outside the frame,
Molded motor. In a molded motor in which a stator is molded with a mold resin to form a frame, and a bushing for drawing a lead wire from the frame to the outside is integrally molded with the frame.
The bushing is a synthetic resin;
An elastic body is attached to a lead-out portion of the lead wire in the bushing inside the frame,
Molded motor. In a molded motor in which a stator is molded with a mold resin to form a frame, and a bushing for drawing a lead wire from the frame to the outside is integrally molded with the frame.
The bushing is a synthetic resin;
Ribs are formed on the outer periphery of the bushing inside the frame,
Molded motor. In a molded motor in which a frame is formed by molding a stator and a wiring board with a mold resin,
A support member for supporting the wiring board on the mold is protruded from the wiring board,
The support member is an elastic body and is compressed by the frame;
Molded motor.

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