JP5213842B2 - motor - Google Patents

Description

  The present invention relates to a motor including an aluminum wire coil.

  In order to reduce the cost of the motor, if an aluminum wire that is cheaper than the copper wire is used for the coil winding, the resistivity increases about 1.6 times that of the copper wire. Therefore, in order to obtain the same motor characteristics, it is necessary to increase the cross-sectional area of the aluminum wire by about 1.6 times.

  If the cross-sectional area of the coil winding is about 1.6 times, the spatial distance between the coil winding that is the charging part in the motor and the motor outer shell (frame, bracket) that is the non-charging metal part will be shortened. Problems such as poor withstand voltage occur. For this reason, it is necessary to install an insulating material around the coil winding or to secure a spatial distance by increasing the size of the motor outer shell.

  Aluminum wire has a high corrosion rate and low proof strength against salt. Even in the coil winding, the joint portion from which the insulating film is peeled is particularly susceptible to corrosion, and corrosion disconnection becomes a problem. Therefore, when using aluminum wire as the coil winding, a filler is applied to the joint to protect it from chlorides (if the motor is installed near the sea, Countermeasures are also necessary).

  Conventionally, a stator around which a coil is wound, a rotor disposed in the stator, and an inner peripheral portion, an outer peripheral portion, and a top portion of a ring-shaped coil protruding from the stator are covered over the entire circumference. A resin member that is formed in a ring shape with a U-shaped cross section and that includes a shape memory alloy, and a resin that deforms and protrudes the resin member by heat during molding and forms a frame. A motor is disclosed (for example, see Patent Document 1).

Japanese Unexamined Patent Publication No. 4-67753

  However, as in the above-described conventional technology, the motor shell is enlarged, the filler is applied to the joint portion of the aluminum wire, the resin member including the shape memory alloy is used, and the frame is formed by the resin mold. However, there is a problem that the cost reduction effect, which is the purpose of changing the coil winding from the copper wire to the aluminum wire, is reduced.

  This invention is made | formed in view of the above, Comprising: It aims at obtaining a motor provided with the aluminum wire coil with a large cost reduction effect.

  In order to solve the above-described problems and achieve the object, the present invention is arranged in a stator around which an aluminum wire coil is wound, a terminal block installed at a coil end of the aluminum wire coil, and the stator. A rotor, a metal frame and bracket for housing the stator and the rotor, a heat-shrinkable cylindrical insulating coating that integrally adheres and coats the outer periphery of the aluminum wire coil and the terminal block from the outside, It is characterized by providing.

  According to the present invention, there is an effect that a motor having an aluminum wire coil that is small, inexpensive, and resistant to salt damage can be obtained.

FIG. 1 is a longitudinal sectional view showing Embodiment 1 of the motor of the present invention. FIG. 2 is a longitudinal sectional view showing a comparison between the aluminum wire coil of the motor of the first embodiment and a conventional copper wire coil. FIG. 3 is a longitudinal sectional view showing a second embodiment of the motor of the present invention. FIG. 4 is an exploded perspective view showing a stator and a rotor according to the second embodiment of the motor of the present invention.

  Embodiments of a motor according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment 1 FIG.
FIG. 1 is a longitudinal sectional view showing Embodiment 1 of the motor of the present invention. As shown in FIG. 1, in the induction motor 91 as the motor of the first embodiment, a front bearing holding portion 1a is formed at the center of the front end plate 1t, and a frame flange 1b is formed at the outer peripheral portion of the rear end of the cylindrical body 1d. The stator 2 is composed of a metal frame 1 formed in a cap shape as a whole, a core 2b around which an aluminum wire coil 2a is wound, and is fitted in a cylindrical body 1d of the frame 1, and a shaft 3a. Is inserted, the front bearing 3b and the rear bearing 3c are mounted, the front bearing 3b is held by the front bearing holding portion 1a of the frame 1 and the rotor 3 disposed in the stator 2, and the rear bearing 3c in the center of the rear end plate 4t. A bracket flange 4b is formed on the outer peripheral portion of the front end of the cylindrical body 4d. The bracket flange 4b is fastened by the frame flange 1b and the screw 5. The gold is formed in a cap shape as a whole. And manufacturing of the bracket 4, and a.

  The core 2b is formed in a thick cylindrical shape by laminating electromagnetic steel plates, and has a plurality of axial through holes called slots (not shown), and aluminum wires are passed through the slots to the teeth (not shown). The aluminum wire coil 2a is formed by winding. The rotor 3 is formed in a cylindrical shape having a plurality of slots (not shown) by laminating electromagnetic steel plates, and a secondary conductor made by die-casting aluminum is inserted into the slot. The frame 1 and the bracket 4 are manufactured by drawing a steel plate.

  At the coil end on the rear side of the aluminum wire coil 2a, a ring-shaped groove-shaped terminal block 6 for connecting the aluminum wire coil 2a and a lead wire (not shown) is installed. A plurality of terminals 7 are arranged in the groove of the terminal block 6. The end of the aluminum wire coil 2a is joined to the terminal 7 by soldering or welding to form a joint 8.

  Next, a characteristic configuration of the induction motor 91 of the first embodiment will be described. Two cylindrical polyolefin resin films 9 are prepared as heat-shrinkable insulating films manufactured by vacuum forming. The outer peripheral portion and coil end of the front aluminum wire coil 2a are covered with one polyolefin resin film 9, and the outer peripheral portion of the rear aluminum wire coil 2a and the outer peripheral portion and rear portion side of the terminal block 6 are covered with another polyolefin resin film 9. Then, heat is applied to the two polyolefin resin films 9 at 110 ° C. or more to shrink the polyolefin resin film 9.

  Since the cylindrical polyolefin resin film 9 shrinks by 30% or more in inner diameter by heating, the cylindrical polyolefin resin film 9 includes the outer peripheral portion and coil end of the front aluminum wire coil 2a, and the rear aluminum wire coil. The outer peripheral part of 2a, the outer peripheral part of the terminal block 6, and the rear part side can be closely adhered and covered.

  If a hot-melt adhesive is applied to the inner periphery of the tubular polyolefin resin film 9, the polyolefin resin film 9 is attached to the outer periphery and coil end of the front aluminum wire coil 2a, and the rear aluminum wire coil. It can adhere | attach on the outer peripheral part of 2a, the outer peripheral part of the terminal block 6, and the rear part side.

  The rotor 3 is disposed in the stator 2 in which the outer peripheral portion of the aluminum wire coil 2a and the terminal block 6 are integrally and closely covered with a polyolefin resin film 9 as a heat-shrinkable insulating film, and the metal frame 1 and the bracket 4 are placed inside. The induction motor 91 as the motor of the first embodiment is completed.

  FIG. 2 is a longitudinal sectional view showing a comparison between the aluminum wire coil of the motor of the first embodiment and a conventional copper wire coil. As shown in FIG. 2, when the copper wire coil 2k is changed to the aluminum wire coil 2a, the cross-sectional area of the aluminum wire is changed to a copper wire in order to obtain the same characteristics as the copper wire coil 2k due to the difference in resistivity between copper and aluminum. It is necessary to make it about 1.6 times the cross-sectional area.

  Therefore, the insulation distance between the coil end of the aluminum wire coil 2a and the frame 1 or the bracket 4 is shortened, and it is necessary to enlarge the motor or interpose an insulator. In addition, aluminum wire has low salt damage resistance and requires measures against corrosion disconnection. In particular, since the insulating film of the aluminum wire is peeled off at the joint 8 between the terminal 7 and the wire end of the aluminum wire coil 2a, the aluminum wire substrate is exposed and becomes the most fragile part of the motor. Yes.

  As a method for protecting the joint portion 8 between the terminal 7 and the wire end of the aluminum wire coil 2a, it is common to apply a filler such as epoxy resin. However, in order to cure the epoxy resin, a high temperature is applied for a long time. It is necessary to add, processing cost will increase.

  In the induction motor 91 of the first embodiment, the insulation distance between the coil end of the aluminum wire coil 2a and the frame 1 or the bracket 4 is increased by using the polyolefin resin film 9 that has a short processing time, is inexpensive and has high reliability. At the same time, the sealing property of the terminal block 6 can be enhanced. In addition, as a material of the heat-shrinkable insulating coating, fluoropolymer or thermoplastic elastomer may be used instead of polyolefin.

Embodiment 2. FIG.
FIG. 3 is a longitudinal sectional view showing a second embodiment of the motor of the present invention, and FIG. 4 is an exploded perspective view showing a stator and a rotor of the second embodiment of the motor of the present invention. As shown in FIGS. 3 and 4, in the induction motor 92 according to the second embodiment, a resin end plate 21 is attached to the end surface of the core 2 b of the stator 2.

  The end plate 21 is a simple insulator and has a slot having the same shape as the slot of the core 2b. The aluminum wire of the aluminum wire coil 2a is inserted into the slot, and the end plate 21 is provided between the end surface of the aluminum wire coil 2a and the core 2b. Is insulated. The end plate 21 is provided with a ring-shaped notch 21a on the outer peripheral portion on the end face side of the core 2b.

  Two cylindrical polyolefin resin films 9 are prepared, and the outer peripheral part and coil end of the front aluminum wire coil 2a are covered with one polyolefin resin film 9 from the outer side, and the outer peripheral part of the end plate 21, the rear aluminum wire coil The outer peripheral part of 2a, the outer peripheral part and the rear part side of the terminal block 6 are integrally covered with the other polyolefin resin film 9 from the outside, and heat is applied to the two polyolefin resin films 9 at 110 ° C. or more, thereby the polyolefin resin film 9 Shrink.

  Since the cylindrical polyolefin resin film 9 contracts by 30% or more in inner diameter by heating, the cylindrical polyolefin resin film 9 is composed of the outer peripheral portion of the front aluminum wire coil 2a, the coil end, and the outer peripheral portion of the end plate 21. The outer peripheral portion of the rear aluminum wire coil 2a, the outer peripheral portion and the rear portion of the terminal block 6 are closely adhered to each other. At this time, the end portion on the core 2b side of the polyolefin resin film 9 is connected to the end surface of the core 2b. It bites into (enters) the gap between the notch 21a of the plate 21.

  In this way, by sealing the end portion of the polyolefin resin film 9 on the core 2b side into the gap between the end surface of the core 2b and the notch portion 21a of the end plate 21, the hermeticity of the aluminum wire coil 2a and the terminal block 6 is secured. Can be increased. The portions of the induction motor 92 of the second embodiment other than the portions described above are not different from the induction motor 91 of the first embodiment.

Embodiment 3 FIG.
In the first and second embodiments, the induction motors 91 and 92 are used as the motor, but the motor may be a brushless motor having a magnet on the rotor.

  As described above, the motor according to the present invention is useful for a ventilation fan or the like, and is particularly suitable for a bathroom ventilation fan.

DESCRIPTION OF SYMBOLS 1 Frame 1a Front bearing holding | maintenance part 1b Frame flange 1d Cylindrical trunk | drum 1t Front end plate 2 Stator 2a Aluminum wire coil 2b Core 2k Copper wire coil 3 Rotor 3a Shaft 3b Front bearing 3c Rear bearing 4 Bracket 4a Rear bearing holding part 4b Bracket flange 4d cylindrical body 4t rear end plate 5 screw 6 terminal block 7 terminal 8 joint 9 polyolefin resin film (insulating film)
21 End plate 21a Notch 91, 92 Induction motor (motor)

Claims (5)

A stator wound with an aluminum wire coil;
A terminal block installed at the coil end of the aluminum wire coil;
A rotor disposed in the stator;
A metal frame and bracket for housing the stator and rotor;
A heat-shrinkable cylindrical insulating coating that integrally and tightly coats the outer periphery of the aluminum wire coil and the terminal block from the outside;
A motor comprising:   The motor according to claim 1, wherein the stator has a resin end plate attached to a core end surface, and the insulating coating closely coats the end plate.   The end plate is provided with a ring-shaped notch in the outer peripheral portion on the core end surface side, and the core side end of the insulating coating enters the gap between the core end surface and the notch. The motor according to claim 2.   The motor according to claim 1, wherein a material of the insulating coating is any one of polyolefin, fluoropolymer, and thermoplastic elastomer.   The motor according to any one of claims 1 to 4, wherein the insulating coating is bonded to an outer peripheral portion of the aluminum wire coil and the terminal block by a hot-melt adhesive.

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