JP2003047197A - Electric motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive outer-roller type electric motor that improves the assemblability of an electrical appliance by reducing a parts item and integrating accessories. SOLUTION: The electric motor 1 is configured such that: one end of a fixed shaft 2 is fixed to an object to be fixed; a stator 5 is mounted to the fixed shaft 2; and a rotor 10 is provided having a reversed-cup shaped spider 14 co-axially arranged along the external periphery of the stator 5. The rotor 10 is rotatably supported via a bearing 15 at only the other end 2b of the fixed shaft 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric motor used for electric appliances such as an electric washing machine.

[0002]

2. Description of the Related Art An example of a conventional electric motor will be described with reference to a schematic sectional view of an inner rotor type induction motor 50 (hereinafter referred to as electric motor 50) shown in FIG.

As shown in the figure, an electric motor 50 includes a cylindrical spider 51 having a hollow inside, in which a pair of upper and lower cylindrical spiders 51a and 51b are fastened, and a stator arranged along the inner circumference thereof. 52 and a rotor 56 arranged around the stator 52 so as to face each other.

The stator 52 comprises a stator core 53 and a winding 54 wound around it, and a lead wire 59 from a power source is connected to the end of the winding 54.

The rotor 56 has a rotating shaft 55,
The rotor core 57 has a plurality of slot portions 58 fixed around the rotating shaft 55. Molten aluminum is pressed into the slot portions 58, and at the same time, the rotor iron core 57 is formed.
Both side surface portions 59a and 59b are also cast from molten aluminum, and a ventilation fan 61 is further formed to form a so-called aluminum cast rotor.

In this electric motor 50, the rotating shaft 55 is rotatably supported and attached by two bearings 62 and 63 arranged in the upper and lower central portions of the upper and lower spiders 51a and 51b, respectively, and the cylindrical spy bar 51 is mounted. The iron core 57 of the rotor 56 is positioned and housed at a position facing the stator 52 provided on the inner circumference, and the upper and lower spiders 51a,
It is assembled by fastening 1b.

The electric motor 50 is attached to an electric product such as an electric washing machine with a holding plate 67 fixed thereto.

Therefore, in the conventional electric motor 50, the cylindrical spider 51 is a single component, and since the stator 52 and the rotor 56 are housed inside, a vertically divided spider structure is required, and the rotating shaft 55 is used. Since two bearings for supporting the motor are required, the number of parts is increased, and the number of steps for assembling the electric motor is increased.

Further, in this electric motor 50, a pulley 65 for transmitting the driving force of the electric motor to the outside is attached to the end of the rotary shaft 55 protruding from the electric motor 50 and fixed by a screw 66. For this reason, the pulley 65 is prepared as a separate component, and is often attached to the electric motor when the electric motor 50 is incorporated into an electric product such as a washing machine, resulting in a problem that the number of steps for assembling the product becomes complicated.

The electric motor 50 includes a substrate (not shown) having various electronic components for driving and controlling the electric motor,
Alternatively, in order to cool the heat generated by energizing the winding, a cooling fan is provided to blow air to the electric motor 50. This cooling fan is generally attached later as an accessory to the electric motor 50.

[0011]

Electric motors are often used as drive sources for electric products, and in recent years, due to the demand for lower prices of electric products, even electric motors are inexpensive and can be used for production during product manufacture. There is a need for something that is easy to use.

According to the present invention, the number of parts constituting the electric motor is reduced, and the accessory parts which are conventionally required as separate parts are integrated with the constituent parts of the electric motor.
An object of the present invention is to provide an electric motor that is inexpensive and can simplify the assembly process of the electric motor and the electric product.

[0013]

According to a first aspect of the present invention, one end of a fixed shaft is fixed to an attachment target, a stator is provided on the fixed shaft, and the fixed shaft is coaxially arranged along an outer circumference of the stator. In the electric motor having a rotor provided with an inverted cup-shaped spider, the rotor is rotatably supported via a bearing only at the other end of the fixed shaft.

According to the electric motor of the present invention, the rotor is arranged on the outer circumference of the stator, and is rotatably supported and attached by a single bearing provided on the fixed shaft of the stator. It is possible to reduce the number of components and reduce the number of assembly steps. In addition, it is possible to reduce the amount of copper wire used in the winding of the stator, and by winding it directly below, the coil end can be lowered and the winding can be made bindless.

According to a second aspect of the present invention, the rotor comprises a reverse cup-shaped spider made of resin or aluminum die cast and a rotor core having a slot portion arranged on the inner periphery thereof, and the pulley has the rotation. It is provided in the bearing part of the child,
The electric motor according to claim 1, wherein the pulley is integrally formed with the inverted cup-shaped spider at the same time.

According to the present invention, the pulley for transmitting the rotational drive of the electric motor to the outside is integrally formed with the rotor, so that the induction motor in which the pulley is not required as a separate component can be obtained.

According to a third aspect of the present invention, the rotor comprises an inverted cup-shaped spider made of resin or aluminum die cast, and a rotor core having a slot portion arranged on the inner periphery thereof, and the cooling fan is the above-mentioned. The electric motor according to claim 1 or 2, wherein the inverted fan is provided downward from the ceiling of the inverted cup-shaped spider, and the cooling fan is integrally formed with the inverted cup-shaped spider at the same time.

According to the present invention, the wind generated by the cooling fan is blown into the electric motor by the rotational driving of the rotor,
An induction motor capable of cooling the electric motor can be obtained.

According to a fourth aspect of the present invention, the rotor comprises a reverse cup-shaped spider made of resin or aluminum die cast and a magnet arranged on the inner periphery of the spider, and a pulley is provided on a bearing portion of the rotor. The electric motor according to claim 1, wherein the pulley is formed integrally with the inverted cup-shaped spider at the same time.

According to the present invention, the pulley for transmitting the rotational drive of the electric motor to the outside is integrally formed with the rotor, so that the DC electric motor in which the pulley is not necessary as a separate component can be obtained.

According to a fifth aspect of the present invention, the rotor is composed of a reverse cup-shaped spider made of resin or aluminum die casting and a magnet arranged on the inner periphery thereof, and a cooling fan is provided on the ceiling of the reverse cup-shaped spider. The cooling fan is integrally formed at the same time as the inverted cup-shaped spider.
Alternatively, it is the electric motor according to item 4.

According to the invention, the wind generated by the cooling fan is blown into the electric motor by the rotational driving of the rotor,
A direct current electric motor is obtained which can cool the electric motor.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

(First Embodiment) FIG. 1 is a schematic sectional view of an outer rotor type induction motor 1 of the first embodiment (hereinafter referred to as the electric motor 1).

In the figure, a motor 1 is housed in a holding plate 3, a fixed shaft 2, a stator 5 composed of a stator core 6 and windings 7 wound around it, an inverted cup-shaped spider 14 and its inside. And a rotor 10 composed of a rotor core 11 having a slot 12 formed therein to form an outer rotor type induction motor.

The holding plate 3 is an object to which the electric motor 1 is attached,
It is fixed to electrical appliances such as the bottom of an electric washing machine.

The stator 5 is composed of a fixed shaft 2 fixed vertically to the holding plate 3 and a stator core 6 around which a winding 7 fixed along the outer periphery of the fixed shaft 2 is wound. A lead wire 8 from a power source is connected to the end of the winding 7.

The fixed shaft 2 is made up of a resin holding plate 3
If the fixed shaft 2 is set in the mold during formation and is held when the holding plate 3 is solidified, the assembly accuracy and efficiency of the electric motor 1 can be improved.

The rotor 10 has one end 2b of the fixed shaft 2.
In only one place, the inverted cup-shaped spider 14 rotatably supported by the fixed shaft 2 via the bearing 15, positioned by the retaining ring 16 and attached, and the outer peripheral portion of the iron core 6 of the stator 5 are opposed to each other. Like the inverted cup-shaped spider 1
4 and a rotor core 11 having a plurality of slot portions 12 provided on the inner peripheral side.

Further, the inverted cup-shaped spider 14 is
An aluminum die-cast product or a resin molded product is used.

In the iron core 11 of the rotor 10, molten aluminum is press-fitted and cast into the slot portion 12, and at the same time, both side portions 11a and 11b of the rotor iron core 11 are also covered with aluminum to form ring ends 13a and 13b. It forms an aluminum cast rotor.

Further, the electric motor 1 is provided with a substrate (not shown) having electronic parts for controlling the driving of the electric motor.

In the electric motor 1 having the above structure, when the winding 7 starts to be energized, a rotating magnetic field is generated in the stator 5, which causes a rotating torque in the rotor 10 to start the rotational driving of the electric motor 1. To do.

In this electric motor 1, one end 2b of the fixed shaft 2 is
Although the rotor 10 supported by only one bearing 15 provided in the rotor is driven to rotate, the rotor 10 rotates at a high speed with the rotating magnetic field generated by the stator 5.
It is possible to rotate without rocking due to the repulsion action of the above, and it is possible to exhibit the rotation performance equivalent to that of the electric motor which has supported the rotary shaft of the rotor by using two conventional bearings. As shown in the figure, if the rotor 10 has an inverted cup-shaped spider, the rotational stability is kept good even at low speed rotation.

This rotational driving force is rotated together with the inverted cup-shaped spider 14 via the pulley 17 attached to the bearing 15, and is transmitted to the outside by a transmission belt (not shown).

Therefore, in this electric motor 1, the conventional spider which has formed the rotor 10 by fastening the upper and lower two cup-shaped spiders is one inverted cup-shaped spider 1.
Since the rotor 10 can be supported by one bearing 15, the number of parts of the spider and the bearing can be reduced by half, and the number of assembling steps can be reduced.

A metal bearing, a ball bearing or the like is used as the bearing 15 for supporting the inverted cup-shaped spider 14 and the pulley 17 on the fixed shaft 2.

In this electric motor 1, the stator 5 is connected to the rotor 1
Since it is housed inside 0, the magnetic field generation efficiency of the stator 5 is improved, the winding amount of the winding 7 can be reduced, and the amount of copper wire used can also be reduced.

Further, by winding the winding 7 of the stator 5 directly below, it is possible to reduce the amount of protrusion of the coil end from the iron core 6, and it is necessary to bind and restrain the coil with hemp thread or the like as in the conventional case. Since it is eliminated, it becomes easy to simplify the structure and improve the processing efficiency of the winding 7 by making the winding 7 bindless.

Since the rotor 10 is formed by the cup-shaped open type spider 14, the heat radiation effect of the electric motor 1 is improved as compared with the conventional closed type spider.

(Second Embodiment) FIG. 2 shows an outer rotor type induction motor 20 of the second embodiment (hereinafter referred to as the electric motor 20).
Is a schematic sectional view of FIG.

The electric motor 20 is a further improvement of the inverted cup-shaped spider 14 in the first embodiment. Since the main structure inside the electric motor 20 is the same as that of the first embodiment, the description thereof is omitted.

In FIG. 2, reference numeral 22 designates a pulley integrated spider in which a pulley portion 23 is provided at the center of the ceiling of an inverted cup-shaped spider and the spider body portion and the pulley portion 23 are integrally molded at the same time.

In the electric motor 20, the rotor 21 is equipped with a slot 12 and a pulley integral spider 22 having on its inner circumference a rotor core 11 having aluminum cast-in ring ends 13a and 13b on both side portions. A pulley portion 23 formed integrally with the spider is rotatably attached to one end portion 2b of the fixed shaft 2 via a bearing 26.

Therefore, the pulley integrated spider 22
Has the function of a rotor 21 of the electric motor 20 and a pulley for transmitting the rotational drive thereof to the outside at the same time, which eliminates the need for the pulley as a single component and eliminates the step of attaching the pulley in the product assembling process. To be done.

Further, the pulley integrated spider 2
2, a plurality of cooling fans 24 are provided downward from the ceiling of the spider at predetermined intervals in the circumferential direction.

The cooling fan 24 ventilates the inside of the electric motor 20 as the rotor 21 rotates, agitates the air inside the electric motor 20, and stores various electronic components for driving control which are housed inside the electric motor 20. The heat generated by energizing the substrate (not shown) or the stator winding is dissipated, and the motor 20
It is possible to prevent overheating and maintain the performance.

FIG. 3 (partial sectional view taken along the line AA of FIG. 2)
As shown in, when the ventilation port 25 is opened in the ceiling adjacent to the cooling fan 24, the outside air 27 is easily introduced into the electric motor 20 by the rotation of the rotor 21, and the ventilation is further improved and the cooling effect is improved. Can be further improved.

The cooling fan 24 and the ventilation port 25 can be formed integrally at the same time when the pulley integrated spider 22 is formed, and can be obtained by an aluminum die casting or a resin material injection molding method.

Therefore, when assembling and assembling an electric motor into an electric product or the like as in the prior art, it is not necessary to install a new cooling fan or a separate cooling device, so that the number of parts and the installation process associated therewith are omitted. Thus, the induction motor can be obtained which can simplify not only the manufacture of the electric motor itself but also the manufacture of products using the electric motor.

(Third Embodiment) FIG. 4 shows an outer rotor type DC electric motor 30 (hereinafter referred to as electric motor 3) of the third embodiment.
(Referred to as 0).

In the figure, the electric motor 30 has a holding plate 43.
From the fixed shaft 42, the stator 35 composed of the stator core 36 and the windings 37 wound around the stator core 36, the reverse cup-shaped spider 32 made of resin or aluminum die cast, and the magnet 33 housed therein. And an outer rotor type DC electric motor.

The holding plate 43 is an object to which the electric motor 30 is attached, and is fixed to an electric product such as the bottom of the electric washing machine.

The stator 35 is composed of a fixed shaft 42 which is vertically fixed to the holding plate 43, and a stator iron core 36 around which a winding 37 fixed around the outer circumference of the fixed shaft 42 is wound. The lead wire 3 from the power source is connected to the end of the winding 37.
8 is connected.

If the fixed shaft 42 is set in a mold when the resin holding plate 43 is formed and is held when the holding plate 43 is solidified, the assembly accuracy and efficiency of the electric motor 30 can be improved. It is possible to improve.

The rotor 31 has one end 4 of the fixed shaft 42.
The inverted cup-shaped spider 32, which is rotatably supported by the fixed shaft 42 via the bearing 45, is positioned and attached by the retaining ring 46, and the stator 3 only at one location 2b.
5 is formed of a magnet 33 provided on the inner peripheral side of the inverted cup-shaped spider 32 so as to face the outer peripheral portion of the iron core 36.

Further, as shown in the figure, a pulley portion 46 is provided at the center of the ceiling of the inverted cup-shaped spider 32, and the spider body portion and the pulley portion 46 can be integrally molded at the same time to form an integral type spider. At 46, it is rotatably attached to one end 42b of the fixed shaft 42 via a bearing 45.

Therefore, the pulley is not required as a separate component, and the pulley attaching step is omitted in the product assembling step.

Further, the inverted cup-shaped spider 32 has
If the plurality of cooling fans 47 and the ventilation ports 48 are provided at a predetermined interval in the circumferential direction of the ceiling, the electric motor 30 is ventilated as the rotor 31 rotates, so that the electric motor 30 can be cooled efficiently. it can.

The cooling fan 47 and the ventilation port 48 can be formed integrally with the pulley portion 46 when forming the inverted cup-shaped spider 32.

In the electric motor 30 having the above structure, when the winding 3 starts to be energized, a rotating magnetic field is generated in the stator 35, which causes a rotating torque in the rotor 31 to rotate the electric motor 30.

In this electric motor 30, the rotor 31 supported by only one bearing 45 provided at the one end 42b of the fixed shaft 42 is driven to rotate.
1 can rotate without rocking due to the repulsive action of the rotating magnetic field generated by the stator 35 and the rotor 31 rotating at high speed, and supports the rotating shaft of the rotor by using two conventional bearings. The same rotation performance as the conventional electric motor can be exhibited. As shown in the figure, if the rotor 31 has an inverted cup-shaped spider, the rotational stability is kept good even at low speed rotation.

Therefore, in this electric motor 30, the rotor 31
Is composed of one inverted cup-shaped spider 32, and the one bearing 45 can support the rotor 31, so that the number of parts of the spider and the bearing is reduced by half.
As a result, the number of assembling steps can be reduced.

Further, since the pulley and the cooling fan can be integrated with the spider, the number of parts can be reduced and the mounting process can be omitted, and not only the manufacture of the electric motor itself but also the manufacture of the product using it can be simplified. You can

Furthermore, since the electric motor 30 has the stator 35 housed inside the rotor 31, the magnetic field generation efficiency of the stator 35 is improved, the winding amount of the winding wire 37 is reduced, and the copper wire usage amount is reduced. The amount of protrusion of the coil end from the iron core 36 can be reduced by reducing the winding number of the stator 35 and winding the winding 37 of the stator 35 directly below the coil. Since it is eliminated, it becomes easy to simplify the structure by improving the binding of the winding wire 37 and improve the processing efficiency of the winding wire 37.

As described above, in this embodiment, it is possible to obtain a DC electric motor which can simplify the structure of the electric motor, reduce the number of parts, and simplify the manufacturing process of the electric motor and the assembling into a product.

Although the above embodiment has been described according to the example of the outer rotor type electric motor, the present invention is not limited to this.

[0068]

As described above, according to the electric motor of the present invention, since the rotor has a structure in which one end of the fixed shaft is rotatably supported via the bearing, the structure of the electric motor is simplified. The number of components can be reduced, and the amount of copper wire used and the windings can be made bindingless. Furthermore, by integrating the transmission pulley and cooling fan with the rotor configuration, not only can the number of parts for the motor be reduced, but also the manufacturing of the motor and the process of incorporating it into the product can be simplified. Have.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of an outer roller type induction motor according to a first embodiment.

FIG. 2 is a schematic sectional view of an outer roller type induction motor of a second embodiment.

FIG. 3 is a partial cross-sectional view taken along the line AA of FIG.

FIG. 4 is a schematic sectional view of an outer roller type DC electric motor of a third embodiment.

FIG. 5 is a schematic cross-sectional view of a conventional inner roller type electric motor.

[Explanation of symbols]

1, 20 ... Outer roller type induction motor 2, 42 ... Fixed axis 3,43 ... Holding plate 5,35 ... Stator 6,36 ...... Stator core 7,37 ... Winding 10, 21, 31 ... Rotor 11 ... Rotor core 12 …… Slot part 13 ... Ring end 14,32 ... Inverted cup-shaped spider 15, 26, 45 ... Bearings 17 ... pulley 22 ...... Spider with integrated pulley 23,46 ... Pulley part 24, 47 ... Cooling fan 25, 48 ... Ventilation port 30 ... Outer rotor type DC motor 33 ... Magnet

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) H02K 21/22 H02K 21/22 MF term (reference) 3B155 BB05 HB09 HB14 HB35 MA02 5H013 LL00 LL07 MM01 MM06 NN02 NN08 PP01 5H607 AA00 AA12 BB06 BB09 BB14 BB17 BB25 CC01 CC03 CC05 DD14 EE28 FF04 FF11 KK07 5H609 BB02 BB03 BB12 BB18 BB20 PP02 PP06 PP08 PP09 QQ02 QQ12 JK17J17K17J01K17J01K17 J01K17J01K17J07K07H04 BB07 GA04 H07J07K17H01J15K07H04

Claims (5)

[Claims] 1. A rotor provided with an inverted cup-shaped spider, wherein one end of a fixed shaft is fixed to an object to be attached, the stator is provided on the fixed shaft, and the inverted cup-shaped spider is coaxially arranged along an outer circumference of the stator. An electric motor having the electric motor, wherein the rotor is rotatably supported only through the bearing at the other end of the fixed shaft. 2. The rotor comprises an inverted cup-shaped spider made of resin or aluminum die cast, and a rotor core having a slot portion arranged on the inner periphery thereof, and a pulley is provided on a bearing portion of the rotor. The electric motor according to claim 1, wherein the pulley is integrally formed with the inverted cup-shaped spider at the same time. 3. The rotor comprises a reverse cup-shaped spider made of resin or aluminum die cast and a rotor core having a slot portion arranged on the inner periphery thereof, and a cooling fan of the reverse cup-shaped spider. The electric motor according to claim 1 or 2, wherein the electric fan is provided downward from the ceiling, and the cooling fan is integrally formed at the same time as the inverted cup-shaped spider. 4. The rotor comprises a reverse cup-shaped spider made of resin or aluminum die cast and a magnet arranged on the inner periphery of the spider. A pulley is provided in a bearing portion of the rotor, and the pulley is The electric motor according to claim 1, wherein the electric motor is integrally molded at the same time as the inverted cup-shaped spider. 5. The rotor comprises a reverse cup-shaped spider made of resin or aluminum die cast and a magnet arranged on the inner periphery thereof, and a cooling fan extends downward from the ceiling of the reverse cup-shaped spider. The electric motor according to claim 1, wherein the cooling fan is integrally formed with the inverted cup-shaped spider at the same time.