WO2016067530A1 - Electric motor and ceiling fan equipped with same - Google Patents

Abstract

An electric motor is provided with a stator comprising a stator core with an aluminum wire wound thereon, a rotor rotatably attached to the stator core, and a terminal wire (17) provided to an end portion of the aluminum wire drawn from the stator core. The electric motor is further provided with a sleeve (16) through which the terminal wire (17) is inserted, and a power supply wire (14) for supplying power to the terminal wire (17), the power supply wire (14) having a core wire portion (14b) that conducts electricity and a covering portion (14a) covering the core wire portion (14b). The electric motor is further provided with a solder process portion electrically connecting the terminal wire (17) and the core wire portion (14b) by a solder process, and a thermal contraction tube comprising an adhesive layer covering and welded from an end portion of the covering portion (14a) to an end portion of the sleeve (16) through the solder process portion.

Description

Electric motor and ceiling fan equipped with the same

The present invention relates to an electric motor in which an aluminum wire is used for a stator winding, and a heat-shrinkable tube is covered on a solder connection portion between a terminal wire and a power wire of the winding, and a ceiling fan on which the motor is mounted.

Conventional motors generally use copper wire for the stator winding. However, due to the recent rise in copper prices, replacement with aluminum wires is progressing. In particular, an abduction type induction motor used for a ceiling fan has a large number of poles and a large amount of windings, so there is a strong demand for an alternative to an aluminum wire. When such an aluminum wire is used, a structure that takes into consideration the adhesion and intrusion of moisture into the electrical connection portion of the terminal wire is employed (see, for example, Patent Document 1).

Hereinafter, the electric motor will be described with reference to FIG. 6 and FIG. FIG. 6 is a cross-sectional view of a conventional abduction induction motor 100. FIG. 7 is an enlarged view showing the state of the terminal joint 107 of the conventional abduction induction motor 100.

As shown in FIGS. 6 and 7, in the abduction induction motor 100, an A-phase winding 103 and a B-phase winding 104 are wound around a stator core 102 that supports a hollow shaft 101. A rotor 106 is disposed so as to face the stator core 102.

The rotor 106, together with the upper cover 109 and the lower cover 110, is rotatably supported by the hollow shaft 101 via bearings 108a and 108b. The A-phase winding terminal wire 103 a and the B-phase winding terminal wire 104 a are entangled with the metal terminal 115 attached to the terminal block 105 and are electrically connected by the solder portion 111. An insulating layer 114 made of two different layers of resin, that is, an inner layer portion 112 and an outer layer portion 113 is formed. A terminal connecting portion 107 is constituted by the solder portion 111 and the insulating layer 114. Here, the insulating layer 114 is formed so as to cover the solder portion 111.

JP 2013-188048 A

Such a conventional electric motor has the following problems.

As described above, when an aluminum wire is used for a winding of an electric motor, it is indispensable to prevent moisture from adhering to and entering the electrical connection portion of the terminal wire in order to prevent disconnection. However, moisture adhesion easily occurs even in a high humidity state. For this reason, there exists a problem that the cost of materials, such as the metal terminal 115 and the insulating layer 114 which are materials for preventing adhesion of moisture, becomes expensive. In addition, there is a problem in that the thickness of the insulating layer 114 tends to vary and the management is difficult. Furthermore, there is a problem that it takes a considerable time to cure the insulating layer 114.

It is an object of the present invention to provide a highly reliable electric motor that can easily and stably accommodate an electrical connection portion of a terminal wire in a closed space and exhibit a moisture shielding effect from the outside while suppressing material costs. And

In order to achieve this object, an electric motor according to the present invention is drawn from a stator in which an aluminum wire is wound around the stator core, a rotor that is rotatably attached to the stator core, and the stator core. A terminal wire provided at an end of the aluminum wire. Moreover, the sleeve which penetrated the terminal wire, the core wire part which conducts electricity, and the coating | coated part which coat | covers a core wire part are provided, and the power supply line which supplies electric power to a terminal wire is provided. In addition, a solder processing portion in which the terminal wire and the core wire portion are electrically connected by a soldering process, and heat shrinkage that is welded with an adhesive layer from the end of the covering portion to the end of the sleeve through the solder processing portion A tube.

According to the electric motor of the present invention, the effect of blocking external moisture can be exhibited by storing the electrical connection portion of the terminal line in the closed space. As a result, an electric motor with improved reliability and a ceiling fan equipped with the electric motor can be provided.

FIG. 1 is a side view showing a ceiling fan equipped with an abduction type induction motor according to an embodiment of the present invention. FIG. 2 is a partial cross-sectional view showing the configuration of the abduction induction motor according to the embodiment of the present invention. FIG. 3 is a plan view showing the arrangement of windings and the connection between power lines in the abduction induction motor according to the embodiment of the present invention. FIG. 4 is a partially enlarged view showing a connection state between the terminal line and the power line in the abduction induction motor according to the embodiment of the present invention. FIG. 5 is a partial enlarged cross-sectional view showing the heat-shrinkable tube attached to the solder processing portion of the abduction induction motor according to the embodiment of the present invention. FIG. 6 is a cross-sectional view of a conventional abduction induction motor. FIG. 7 is an enlarged view showing a state of a terminal joint portion of a conventional abduction induction motor.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The following embodiments are examples embodying the present invention, and do not limit the technical scope of the present invention. Throughout the drawings, the same parts are denoted by the same reference numerals, and the description after the second time is omitted. Furthermore, in each drawing, the description of the details of each part not directly related to the present invention is omitted.

FIG. 1 is a side view showing a ceiling fan 1 equipped with an abduction induction motor 2 according to an embodiment of the present invention. The ceiling fan 1 is a fan attached to the ceiling. The ceiling fan 1 is also called a ceiling fan. The ceiling fan 1 uses an abduction induction motor 2 as a drive source. The support column 4 is fixed vertically downward from the ceiling. A hollow shaft 6 is connected to the column 4. An abduction type induction motor 2 having a blade 3 is attached to the tip of the hollow shaft 6. Usually, the abduction-type induction motor 2 is provided with a main body cover 5 with a special design, but the main body cover 5 may not be provided.

FIG. 2 is a partial cross-sectional view showing the configuration of the abduction induction motor 2 according to the embodiment of the present invention. FIG. 3 is a plan view showing the arrangement of the windings and the connection with the power supply line 14 in the abduction induction motor 2 according to the embodiment of the present invention.

The abduction induction motor 2 is a capacitor induction motor. The external rotation induction motor 2 includes, for example, an A-phase winding 8 serving as a main winding, for example, an auxiliary winding on the inner peripheral side, in the vicinity of the outer periphery of a stator core 7 in which a predetermined number of thin plates such as electromagnetic steel plates are laminated. A B-phase winding 9 is wound. In the present embodiment, aluminum wires mainly composed of aluminum are used for the main winding and the auxiliary winding.

In the shaft hole 7a provided in the central portion of the stator core 7, a part of the inside is formed hollow, and the hollow shaft 6 through which the power line 14 is inserted is press-fitted and fixed.

The power line 14 is electrically connected to the ends of the A-phase winding 8 and the B-phase winding 9, that is, terminal wires (not shown here) at the upper part of the stator core 7. The terminal wires of the A-phase winding 8 and the B-phase winding 9 extend upward from the winding portion in a state where the braided-type sleeve 16 is inserted starting from a position 21 which is a starting point drawn from the stator. Yes. The power supply line 14 and the terminal line of the A phase winding 8, the terminal line of the power supply line 14 and the B phase winding 9, and the power supply line 14 and the terminal lines of the A phase winding 8 and the B phase winding 9 are Each is electrically connected inside the heat shrinkable tube 15.

On the outer peripheral side of the stator core 7, a rotor 10 in which aluminum is cast into a thin laminated member such as an electromagnetic steel plate is disposed.

The rotor 10 is held and fixed by an upper cover 12 and a lower cover 13. The upper cover 12 and the lower cover 13 are rotatably locked to the hollow shaft 6, that is, the stator core 7, by bearings 11 a and 11 b attached to the top and bottom of the hollow shaft 6.

FIG. 4 is a partially enlarged view showing a connection state between the terminal line 17 and the power supply line 14 in the abduction induction motor 2 according to the embodiment of the present invention. FIG. 5 is a partial enlarged cross-sectional view showing the heat-shrinkable tube attached to the solder processing portion 19 of the abduction induction motor 2 according to the embodiment of the present invention.

As shown in FIG. 4, the outer periphery of the terminal wire 17 of the A-phase winding 8 or the B-phase winding 9 is covered with a sleeve 16. In other words, the terminal line 17 is inserted into the sleeve 16. The extension part of the terminal wire 17 extended from the sleeve 16 is comprised by the non-conduction part 17b which has an insulating film, and the conduction | electrical_connection part 17a which does not have an insulating film.

The power supply line 14 includes a covering portion 14a in which a core wire is covered with an insulator tube, and a core wire portion 14b in which the core wire is exposed. At one end of the power supply line 14, the core wire is a copper wire, that is, a conduction portion 17a. Electric power can be supplied to the conducting portion 17a by using a core wire from a power source connected to the other end of the power source line.

Electrical connection between the power line 14 and the terminal line 17 is performed as follows.

First, solder processing is performed on the core wire portion 14b. As a result, the solder is absorbed between the plurality of conducting wires constituting the core wire portion 14b, and the air containing moisture between the conducting wires is discharged.

Subsequently, the terminal wire 17 is wound from the end portion of the core wire portion 14b to the covering portion 14a in a state where the end portion of the core wire portion 14b and the end portion of the conducting portion 17a are matched. That is, preliminary winding is performed. At this time, the conducting part 17a and the non-conducting part 17b are wound around the core part 14b. The non-conduction part 17b is wound over the covering part 14a from the core part 14b. In other words, the non-conductive portion 17b is preliminarily wound from the covering portion 14a of the power supply line 14 to the core wire portion 14b. Furthermore, the terminal line 17 and the power supply line 14 are electrically connected by the conductive part 17a being wound around and in contact with the core wire part 14b.

Thus, the non-conductive portion 17b is entangled from the covering portion 14a of the power supply line 14 to the core wire portion 14b. And the conduction | electrical_connection part 17a of the terminal wire 17 is entangled in the front-end | tip position of the core wire part 14b. And as shown in FIG. 5, this core part 14b is soldered and the solder process part 19 is formed.

Here, normally, the aluminum wire (terminal wire 17) and the solder are incompatible with the solder connection. However, since the core wire portion 14b is preliminarily soldered, the aluminum wire is sandwiched between the solder layers and firmly connected to the copper wire.

Next, the sleeve 16 and the power supply line 14 are opposed to each other in a substantially straight line. At this time, a gap 18 is provided between the end 22 of the sleeve 16 from which the terminal line 17 extends and the end 23 of the core 14 b of the power line 14. Note that the end portion 23 of the core wire portion 14 b is also an end portion of the solder processing portion 19.

In this state, the heat-shrinkable tube 15 is covered so as to integrally cover a part (end part) of the sleeve 14 through a part (end part) of the covering part 14a through the entire solder processing part 19. As a result, the gap 18 is in a state in which the heat-shrinkable tube 15 encloses the non-conductive portion 17 b of the terminal wire 17.

Then, the heat shrinkable tube 15 is heated and contracted, and at the same time, the heat shrinkable tube 15 corresponding to the position of the gap 18 is pressed in the inner direction, that is, toward the terminal line 17 to form the recess 20. The recessed part 20 is crimped | bonded so that the terminal wire 17 may be inserted | pinched from the up-down direction in FIG. For this reason, it is thinner than the diameter of the surrounding heat-shrinkable tube in side view, that is, it is in a depressed state.

Note that the crimping is not limited to the crimping from the vertical direction. For example, the crimping may be performed in the direction of the terminal line 17, that is, toward the center of the heat shrinkable tube over the entire outer periphery of the heat shrinkable tube corresponding to the position of the gap 18. Good. This also makes it thinner than the diameter of the surrounding heat-shrinkable tube, that is, a depressed state.

The heat-shrinkable tube 15 has a two-layer structure including an outer layer 15a that contracts when heat is applied at a constant temperature and forms an outer shell, and an inner layer (adhesive layer 15b) that improves internal adhesion. Therefore, a certain thickness can be ensured.

After the above-described series of processing operations, the entire A-phase winding 8, B-phase winding 9, sleeve 16 and heat shrink tube 15 are comprehensively varnished.

According to such a configuration, the power supply line 14 and the terminal line 17 can be directly electrically joined. And the terminal wire 17 and the heat contraction tube 15 are sealed. As a result, the moisture blocking effect from the outside can be sufficiently exhibited and a long life can be realized. Therefore, reliability and quality can be improved.

Also, the inner layer (adhesive layer 15b) in the heat shrinkable tube 15 is a welded portion that is welded by covering the end portion of the covering portion 14a to the end portion of the sleeve 16 through the entire 19 parts of the soldering process. Thereby, the distance to the conduction | electrical_connection part 17a which the aluminum wire is exposed and is weak to a water | moisture content is earned, and the penetration | invasion of the water | moisture content from the both ends of the heat contraction tube 15 to the connection part of an aluminum wire and a solder can be suppressed.

Further, a gap 18 that encloses the terminal wire 17 is provided between the end 23 of the solder processing section 19 and the end 22 of the sleeve 16. The heat-shrinkable tube 15 located in the gap 18 is crimped in the terminal line direction to provide a recess that is thinner than the diameter of the surrounding heat-shrinkable tube 15. That is, by crushing the heat shrinkable tube 15 simultaneously with the heat shrinkage, the adhesive layer 15 b penetrates from the opening at the end 22 of the sleeve 16 to the inside, that is, the winding side inside the sleeve 16. By this penetration, the sealing effect with the terminal wire 17 can be further improved at the end of the sleeve 16. Thereby, the penetration | invasion of the water | moisture content to the conduction | electrical_connection part 17a which the aluminum wire has exposed from the position 21 which is the reverse end part of the sleeve 16, and is weak to a water | moisture content can be suppressed in the end part 22 vicinity.

Further, the non-conductive portion 17b is preliminarily wound from the covering portion 14a of the power supply line 14 to the core wire portion 14b. In other words, the winding of the covering portion 14a that is relatively resistant to moisture makes it difficult for moisture that has entered from the covering portion 14a (left side in FIG. 5) to reach the conduction portion 17a.

Further, the terminal wire 17 is held by the covering portion 14a and the core wire portion 14b of the power line 14. Therefore, the stress applied to the terminal wire near the solder joint is alleviated. Therefore, a series of operations such as soldering operation and heat shrinkable tube shrinking can be performed stably and smoothly.

Also, by pre-soldering the core wire portion 14b of the power wire 14, the adhesion between the core wires and the solder wettability with the terminal wire 17 are improved. Therefore, the abduction induction motor 2 has an effect of increasing the accuracy and strength of electrical joining.

Also, varnishing the windings and connecting parts will coat the power line, heat shrink tube and sleeve as a whole. In particular, when the varnish penetrates into the inside of the braided sleeve, the abduction-type induction motor 2 has an effect of completely blocking the moisture ingress path.

The abduction induction motor 2 is suitable for a ceiling fan. That is, the ceiling fan is literally suspended from the ceiling. The abduction-type induction motor 2 is used not only in summer but also in winter as a circulator for a long period of time throughout the year. In particular, ceiling fans installed on the ceiling are exposed to moisture even indoors. For this reason, by adopting the above configuration, the abduction induction motor 2 can provide a ceiling fan with high reliability and quality that is resistant to moisture and can achieve a long life.

As described above, the electric motor corresponding to the abduction type induction motor 2 of the present embodiment includes a stator in which an aluminum wire is wound around the stator core 7 and a rotor that is rotatably attached to the stator core 7. 10 and a terminal wire 17 provided at an end portion of the aluminum wire drawn out from the stator core 7. In addition, a sleeve 16 through which the terminal wire 17 is inserted, a core wire portion 14 b that conducts electricity, and a covering portion 14 a that covers the core wire portion 14 b, and a power supply wire 14 that supplies power to the terminal wire 17 are provided. Further, the solder processing portion 19 in which the terminal wire 17 and the core wire portion 14b are electrically connected by soldering, and the adhesive layer 15b from the end portion of the covering portion 14a to the end portion of the sleeve 16 through the solder processing portion 19 And a heat-shrinkable tube 15 that is welded by covering.

This can demonstrate the effect of blocking external moisture. As a result, an electric motor with improved reliability and a ceiling fan equipped with the electric motor can be provided.

Further, a gap 18 that encloses the terminal wire 17 between the end 23 of the solder processing part 19 and the end 22 of the sleeve 16, and a recess 20 that is thinner than the diameter of the heat-shrinkable tube 15 located in the gap 18 , May be further provided. Thereby, the sealing property of the solder processing portion 19 on the sleeve 16 side is improved.

Further, the extended portion where the terminal wire 17 extends from the sleeve 16 may include a conductive portion 17a having no insulating film and a non-conductive portion 17b having an insulating film. Alternatively, the non-conductive portion 17b may be preliminarily wound from the covering portion 14a to the core wire portion 14b, and the conductive portion 17a may be brought into contact with the core wire portion 14b to be electrically connected. As a result, the terminal wire 17 is held by the covering portion 14a and the core wire portion 14b of the power line 14. Therefore, the stress applied to the terminal wire 17 in the vicinity of the solder joint is alleviated, and a series of operations such as soldering and shrinkage processing of the heat shrinkable tube 15 are performed stably and smoothly.

Moreover, the core wire part 14b to which the conduction part 17a is connected may be preliminarily soldered. Thereby, the solder wettability of the conduction | electrical_connection part 17a and the core wire part 14b improves, and the precision and intensity | strength of electrical joining increase.

Alternatively, the aluminum wire, the sleeve 16 and the heat shrinkable tube 15 may be varnished. As a result, the power supply line 14, the heat shrinkable tube 15, and the sleeve 16 are entirely coated, and the moisture ingress path can be completely blocked.

Moreover, the ceiling fan 1 equipped with the abduction type induction motor 2 may be used. Thereby, it is possible to provide the ceiling fan 1 having a long life and high reliability and quality.

The electric motor according to the present invention can reduce the weight and cost by using an aluminum wire for the stator winding, and can keep the quality of the electrical connection portion between the terminal line and the power supply line high. Therefore, it is useful as a driving electric motor such as a ceiling fan.

DESCRIPTION OF SYMBOLS 1 Ceiling fan 2 External rotation type induction motor 3 Blade | blade 4 Support | pillar 5 Main body cover 6 Hollow shaft 7 Stator core 7a Shaft hole 8 A phase winding 9 B phase winding 10 Rotor 11a, 11b Bearing 12 Upper cover 13 Lower cover 14 Power line 14a Covering part 14b Core wire part 15 Heat shrinkable tube 15a Outer layer 15b Adhesive layer 16 Sleeve 17 Terminal line 17a Conducting part 17b Non-conducting part 18 Gap part 19 Soldering part 20 Recessed part 21 Position 22 End part 23 End part

Claims (6)

1. A stator with an aluminum wire wound around the stator core;
   A rotor rotatably attached to the stator core;
   A terminal wire provided at an end of the aluminum wire drawn from the stator core;
   A sleeve inserted through the terminal wire;
   A power supply line that has a core part that conducts electricity and a covering part that covers the core part, and supplies power to the terminal line;
   A soldered portion electrically connecting the terminal wire and the core wire portion by soldering;
   A heat-shrinkable tube welded with an adhesive layer from the end of the covering portion to the end of the sleeve via the solder processing portion;
   With electric motor.
2. A gap that encloses the terminal wire between the end of the solder processing portion and the end of the sleeve;
   A recess thinner than the diameter of the heat-shrinkable tube located in the gap,
   The electric motor according to claim 1, further comprising:
3. The extension part in which the terminal line extends from the sleeve is,
   A conductive part without an insulating film;
   A non-conductive portion having an insulating film,
   The non-conductive part is pre-wound from the covering part to the core part,
   The electric motor according to claim 1, wherein the conductive portion is in electrical contact with the core wire portion.
4. The electric motor according to claim 3, wherein the core wire portion to which the conduction portion is connected is pre-soldered.
5. The electric motor according to claim 1, wherein the aluminum wire, the sleeve, and the heat shrinkable tube are varnished.
6. The ceiling fan in which the electric motor according to any one of claims 1 to 5 is an abduction type induction motor, and the abduction type induction motor is mounted thereon.

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