KR100459145B1 - outer rotor type induction motor and motor for washing machine - Google Patents

Abstract

The present invention relates to an outer rotor type induction motor capable of automated mass production by improving the arrangement of the coil and a washing machine motor using the same.

To this end, the outer rotor type induction motor according to the present invention is a rotor housing 110 of the magnetic body coupled to the drive shaft 160 through the center, and a plurality of rotors provided on the inner peripheral surface of the rotor housing and forming a closed circuit A plurality of steel sheets are stacked and provided to maintain the conductor 120 and the rotor conductor and a predetermined gap in the rotor housing, and the stator slots 131 are formed parallel to the axial direction along the continuous steel sheet. A stator iron core 130 of which the number is four times the number of poles, and a coil 140 wound directly on the stator slot in a distribution zone so that the main coil and the auxiliary coil are not wound in common in any stator slot. .

Description

Outer rotor type induction motor and motor for washing machine using same

The present invention relates to an induction motor, and more particularly, to an outer rotor type induction motor having a rotor outside the stator and a motor for a washing machine using the induction motor.

In general, an electric motor is a machine that obtains rotational power by converting electrical energy into mechanical energy, and is roughly classified into an AC motor and a DC motor, and among them, an induction motor is a kind of AC motor.

Such an induction motor is an electromagnetic induction of the primary winding connected to the power source, and current is induced in the secondary winding, and the rotational torque is obtained by the interaction between the current induced in the secondary winding and the rotor field. According to the position, it is further classified into an inner rotor type induction motor and an outer rotor type induction motor.

Hereinafter, the structure of the inner rotor type induction motor of the above-described induction motor with reference to the accompanying drawings as follows.

First, Figure 1 is a cross-sectional view schematically showing the structure of a general inner rotor type induction motor, the induction motor is concentric with the stator 10 and the stator to maintain a predetermined void (a) in the inner periphery of the stator The rotor 20 and the drive shaft 30 is press-fitted to the center of the rotor to transmit the rotational force of the rotor to the driven shaft.

The stator 10 is formed of a coil 15 that receives a AC power to form a rotating magnetic field, and a stator iron core 11 of a magnetic material that forms a passage for magnetic flux generated by the rotating magnetic field.

The rotor 20 is a rotor conductor 25 for generating torque by the interaction of the current induced by the coil 15 with the magnetic flux, and a rotor iron core 21 of the magnetic body forming a passage of the magnetic flux. Is done. In addition, both ends of the rotor conductor 25 are provided with end rings 27 which connect the rotor conductors to each other to form one closed circuit.

Referring to the operation of the induction motor configured as described above, the alternating current is applied to the coil 15 generates a magnetic field to rotate the magnetic flux through the stator core (11), the rotating magnetic flux is a void (a By linking with the rotor conductor 25 through), a current is induced in the rotor conductor. At this time, the current induced in the rotor conductor 25 generates a torque in accordance with Fleming's left hand law together with the magnetic flux.

However, as described above, the inner rotor type induction motor is limited in the radius of the rotor as the rotor 20 rotates through the inside of the stator 10, thereby causing a disadvantage of less torque produced in the same volume. It became. In addition, the disadvantages of lowering the utilization of the internal space was also raised. Therefore, recently, an induction motor has been proposed in which a rotor is provided outside the stator to increase torque at the same volume and utilize the inner space of the stator for other purposes. Such an induction motor is called an outer rotor type induction motor.

However, despite the above-described advantages, the outer rotor type induction motor has a number of vulnerabilities in automatically winding the coil to the stator iron core, and thus, there is a problem in that the production cost increases due to the impossible of automatic mass production.

In other words, the induction motor requires a plurality of poles to obtain a rotational force, and the number of these poles depends on the arrangement of the coils. In general, a widely used coil arrangement is to form eight poles using 48 stator slots.

More specifically, as shown in FIG. 2, six stator slots are allocated to one pole to form eight poles with 48 stator slots, and main and auxiliary coils are appropriately arranged in the six stator slots. In this case, for convenience of description, arbitrary order numbers are defined in the main coil, the auxiliary coil, and the stator slot, respectively, as shown in FIG. 2. First, the first main coil MC1 is wound through the outermost stator slots S1 and S6 of the stator slots, and then the second main coil MC2 is wound through the stator slots S2 and S5. The first auxiliary coil SC1 and the second auxiliary coil SC2 are wound through the innermost stator slots S3 and S4, respectively. At this time, the third auxiliary coil SC3 and the fourth auxiliary coil SC4 are wound together through the stator slots S2 and S5 in which the second main coil MC2 is wound. Accordingly, the second main coil MC2 wound through the stator slots S2 and S5 has a turn number corresponding to 50% of the number of turns of the first main coil MC1 and the third auxiliary coil SC3. And the fourth auxiliary coil SC4 also has a turn number corresponding to 50% of the turns of the first and second auxiliary coils SC1 and SC2. This is because the second main coil and the third auxiliary coil and the second main coil and the fourth auxiliary coil each share one stator slot.

The coil arrangement as described above is mainly achieved by an inserting method in which, in the case of the inner rotor type induction motor, the coil pre-wound with a winding machine is automatically inserted into the stator slot. Although the inserting method has a high production cost compared to a direct winding method of directly winding a coil in the stator slot, it is possible to automate, thereby providing an advantage in mass production. However, in the case of the outer rotor type induction motor, the position of the stator slot or the opening thereof is different from that of the inner rotor type induction motor, so that existing equipment cannot be used, and new equipment for the inserting method is inevitably required. It became. However, due to the high investment cost of new equipment, most of the coils were not wound by the inserting method. Accordingly, in the case of the outer rotor type induction motor, the coil was inevitably wound by a direct winding method.

However, even in this case, as the main coil and the auxiliary coil are commonly wound in some of the stator slots, there is a significant difficulty in automatically winding the coil using the winding machine. Because the stator slots in which the main coil and the auxiliary coil are wound in common have two types of coils wound in common despite the same cross-sectional area as other stator slots, the number of turns of the coils wound in the other stator slots Because it is different. Therefore, in the outer rotor type induction motor, it is difficult to automatically wind the coil using the winding machine, and thus, automatic mass production was impossible.

The present invention has been made to solve the above problems, an object of the present invention to provide an outer rotor type induction motor capable of automated mass production by improving the arrangement of the coil and a washing machine motor using the same.

1 is a cross-sectional view schematically showing the structure of a general inner rotor type induction motor

2 is a diagram illustrating a coil arrangement of the induction motor according to FIG. 1.

Figure 3 is a cross-sectional view schematically showing the structure of the outer rotor type induction motor according to the present invention

4 is a perspective view showing the rotor housing of the induction motor according to FIG.

Figure 5a is a perspective view showing the stator iron core of the induction motor according to Figure 3

5b is a diagram illustrating a coil arrangement of the induction motor according to FIG. 3.

6 is a cross-sectional view showing the structure of a washing machine to which the induction motor according to FIG. 3 is applied.

Explanation of symbols on the main parts of the drawings

110: rotor housing 113: support end

120: rotor conductor 121: rotor bar

130: stator iron core 131: stator slot

140: coil 150: frame

In order to achieve the above object, the outer rotor type induction motor according to the present invention, the rotor housing of the magnetic body coupled to the drive shaft through the center, the rotor conductor is provided on the inner peripheral surface of the rotor housing and forms a closed circuit, the A plurality of steel sheets are stacked and provided in the rotor housing to maintain a predetermined gap with the rotor conductor, and the number of stator slots formed parallel to the axial direction along the continuous steel sheet is four times the number of poles. And a coil wound directly on the stator slot in a distribution zone so that the main coil and the auxiliary coil are not wound in common in any stator slot.

Therefore, since the outer rotor type induction motor according to the present invention does not have a stator slot in which the main coil and the auxiliary coil are wound in common, the coil may be directly wound on the stator slot by a direct winding method using a winding machine. This enables automated mass production, which provides the advantage of lowering production costs.

In addition, the motor for a washing machine according to the present invention includes a rotor housing of a magnetic body provided under the bearing housing and having a washing shaft coupled to a washing tank or a pulsator at the bottom of the washing tank and penetrating through a bottom center thereof, and the rotor housing. Rotor conductor provided on the inner circumferential surface and forming a closed circuit, and coupled to the bottom surface of the bearing housing and a plurality of steel sheets are laminated to maintain a predetermined gap with the rotor conductor inside the rotor housing, along the continuous steel plate A stator iron core having a number of stator slots formed in parallel with an axial direction is four times the number of poles, and is directly wound in the stator slot in a distribution zone so that a main coil and an auxiliary coil are not wound in common in any stator slot. It includes a coil.

Hereinafter, the outer rotor type induction motor according to a preferred embodiment of the present invention and a washing machine motor using the same will be described in detail with reference to the accompanying drawings.

First, Figure 3 is a cross-sectional view schematically showing the structure of the outer rotor type induction motor according to the present invention, Figure 4 is a perspective view showing a rotor housing of the induction motor according to Figure 3, Figure 5a according to Figure 3 5 is a perspective view illustrating a stator iron core of an induction motor, and FIG. 5B is a diagram illustrating a coil arrangement of the induction motor according to FIG. 3.

As shown in FIG. 3, the outer rotor type induction motor according to the present invention is provided on a rotor housing 110 of a magnetic body through which a drive shaft 160 is coupled, and an inner circumferential surface of the rotor housing and a closed circuit. A plurality of rotor conductors 120, stator iron cores 130 in which a plurality of steel sheets are stacked to maintain a predetermined gap between the rotor conductors, and the stator iron cores It is composed of a coil 140 that receives a power source to form a rotating magnetic field.

As shown in FIG. 4, the rotor housing 110 has a cylindrical shape with an open top surface, and an insertion hole 111 through which a drive shaft penetrates is formed at a center of a bottom surface thereof, and a rotor conductor press-fitted to a predetermined height of the side surface. A supporting end 113 for supporting is formed along the inner circumferential surface. At this time, the height of the support end 113 determines the indentation depth of the rotor conductor. In addition, a plurality of blades 117 are further provided on the bottom of the rotor housing 110 to simultaneously form a plurality of ventilation holes 115 to facilitate cooling of the coil.

The rotor conductor 120 is press-fitted to the support end 113 along the inner circumferential surface of the rotor housing 110, and current is induced from the coil 140 to generate rotational torque. To this end, the rotor conductor 120 is provided with a plurality of steel sheets are stacked, such as a stator iron core 130, a plurality of rotor bars 121 is inserted into the rotor conductor 120 electrically A closed circuit is connected, and the number of the rotor bars 121 is determined according to the number of poles.

The stator iron core 130 forms a concentric circle with the rotor housing 110 and forms a passage for the magnetic flux generated by the rotor magnetic field. To this end, the stator iron core 130, as shown in Figure 5a, is composed of a plurality of electrical steel sheet is hollow is stacked in the center so that the drive shaft penetrates. At this time, each of the electrical steel sheet has a plurality of stator slots 131 is formed radially on the outer peripheral side, the fastening screw insertion hole 133 for fixing the stator iron core on the inner peripheral side is formed. Therefore, the stator iron core 130 is configured by stacking the stator slots 131 and the fastening screw insertion holes 133 so as to be continuous along the axial direction.

At this time, the stator iron core 130 is fixed to the frame 150 through a separate fastening screw 135. The frame 150 is provided at an upper portion of the rotor housing 110, and a bearing installation unit 151 for supporting a bearing 155 provided at an outer circumference of the drive shaft 160 is formed at a central portion thereof.

The coil 140, as described above, is not inserted through the opening of the stator slot 131 in a pre-wound form, but is wound directly on the stator slot through a winding machine, and the shape thereof is a distribution range.

On the other hand, the stator iron core 130 is formed with a stator slot 131, the number of which is four times the number of poles. This is to prevent the main coil and the auxiliary coil from winding in common in any stator slot.

For example, as shown in FIG. 5B, a total of 32 stator slots 131 are formed radially at regular intervals on the stator core 130. Accordingly, eight poles are formed in the stator core 130, and four stator slots 131 are allocated to each pole. At this time, the number of the stator slot 131 is arbitrarily given for convenience of explanation.

Accordingly, the main coil and the auxiliary coil wound through the stator slot 4 in the stator slot 1 forming one pole of the stator slot 131 are wound in the following form. First, the main coil MC1 is wound through the stator slot 1 and the stator slot 4, which are outermost stator slots. Next, the first auxiliary coil SC1 is wound through the stator slot 2 and the stator slot 31, and the second auxiliary coil SC2 is wound through the stator slot 3 and the stator slot 6.

In this way, the second main coil MC2 is wound through the stator slot 5 and the stator slot 8, and the third auxiliary coil SC3 is wound through the stator slot 7 and the stator slot 10. A second pole is formed together with the wound second auxiliary coil SC2. Through this process, each of the eight main coils and the auxiliary coils are wound around the stator core 130 to form a total of eight poles, and the overall shape is well illustrated in FIG. 5A.

At this time, only one of the main coil and the auxiliary coil is wound in the stator slot 131. This means that there is no stator slot in which the main coil and the auxiliary coil are shared, so that the main coil or the auxiliary coil wound around the stator slot has the same number of turns. Thus, each of the coils can be automatically wound directly into the corresponding stator slot using a winding machine.

On the other hand, in order to correspond to the stator in which eight poles are formed of 32 stator slots, it is preferable that approximately 40 to 48 rotor bars 121 are arranged and inserted at equal intervals in the rotor conductor 120.

On the other hand, the outer rotor type induction motor according to the present invention may form a total of 24 stator slots in the stator iron core to form a six-pole. Even in this case, four stator slots are allocated to each pole, and thus, the main coil and the auxiliary coil can be prevented from being commonly wound around any of the stator slots. At this time, it is preferable that approximately 30 to 36 rotor bars 121 are arranged and inserted at equal intervals in the rotor conductor 120.

The outer rotor type induction motor configured as described above may be applied to a washing machine motor for driving a washing shaft.

6 is a cross-sectional view illustrating a structure of a washing machine to which an induction motor according to FIG. 3 is applied. The washing machine according to the present invention is a direct type washing machine which directly transfers a driving force of a motor to a washing shaft without a belt or pulley.

As shown in FIG. 6, the reservoir 203 for storing the washing water in the main body 201 is elastically supported by the suspension 202, and the washing tank 205 for storing the laundry in the reservoir 20 rotates. The pulsator 207, which is installed to be possible and generates water flow at the center of the bottom of the washing tank, is coupled to the washing tank. At this time, the washing shaft 260 is directly coupled to the pulsator 207, so that the washing tank and the pulsator are rotated integrally when the washing shaft is rotated.

The lower end of the reservoir 203 is provided with a bearing housing 250, a pair of bearings 255 for rotatably supporting the washing shaft 260 is provided in the bearing housing up and down.

The motor for driving the washing shaft 260 is provided under the bearing housing 250, the rotor housing 210 of the magnetic body coupled to the laundry shaft through the center of the bottom surface, and the inner peripheral surface of the rotor housing The rotor conductor 220 which is provided in the closed circuit and coupled to the bottom surface of the bearing housing, and the stator iron core 230 is provided with a plurality of steel sheets stacked to maintain a predetermined gap with the rotor conductor inside the rotor housing. And a coil 240 provided at the stator iron core to form a rotating magnetic field by receiving AC power.

The rotor housing 210 is the same as that shown in Figure 4, the upper surface is open cylindrical is formed in the center of the bottom surface is formed with an insertion tube 211 having a predetermined length to be combined with the serration portion 261 of the washing shaft. Then, a support end 213 for supporting the rotor conductor 220 pushed along the side is formed. In addition, a plurality of vents 215 are formed on the bottom of the rotor housing 210 to facilitate cooling of the coil 240, and a plurality of blades 217 for inducing forced circulation of air are further provided. do.

The rotor conductor 220 is press-fitted along the inner circumferential surface of the rotor housing 210 to the support end 213, a plurality of steel sheets are stacked and a plurality of rotor bars (not shown) are inserted therein to form a coil 240 Rotational torque is generated through the current drawn from

The stator iron core 230 is configured by stacking a plurality of electrical steel sheets having an empty center so that the washing shaft 260 penetrates and is fixed by a separate support member 270. At this time, the support member 270 is coupled to the bottom surface of the bearing housing 250 through the fastening screw 235, so that the stator iron core 230 can be fixed to the bearing housing. At this time, a plurality of stator slots are formed on the outer circumferential side of the stator iron core 230 in parallel with the axial direction, and the coil 240 is wound through the stator slots.

The coil 240 is not wound through the opening of the stator slot in a pre-wound form, but is wound directly onto the stator slot through a winding machine, and the shape thereof is a distribution range.

At this time, as described above, stator slots are formed in the stator core 230 such that the number thereof is four times the number of poles. This is to prevent the main coil and the auxiliary coil from winding in common in any stator slot.

For example, the stator iron core 230 may be formed with a total of 32 stator slots radially formed at uniform intervals to form eight poles, as shown in FIG. 5B. In this case, four stator slots are assigned to one pole, and only one of the main coil and the auxiliary coil is wound around each stator slot, thereby eliminating the existence of the stator slot in which the main coil and the auxiliary coil are wound in common. Therefore, since the main coil or the auxiliary coil wound in the stator slots all have the same number of turns and are not commonly wound through any stator slots, the coils are automatically wound directly to the corresponding stator slots using the respective winding machines. Can be.

The specific arrangement of the coil 240 is the same as described above, and thus a detailed description thereof will be omitted.

At this time, in order to correspond to the stator in which eight poles are formed of 32 stator slots, it is preferable that approximately 40 to 48 rotor bars are arranged and inserted at equal intervals in the rotor conductor 220.

In addition, a total of 24 stator slots radially formed at uniform intervals may be formed to form six poles in the stator iron core 230. Even in this case, four stator slots are assigned to one pole, and only one of the main coil and the auxiliary coil is wound around each stator slot, thereby eliminating the existence of the stator slot in which the main coil and the auxiliary coil are wound in common.

At this time, in order to correspond to the stator in which six poles are formed by 24 stator slots, it is preferable that approximately 30 to 36 rotor bars are arranged and inserted at equal intervals in the rotor conductor 220.

On the other hand, the motor for a washing machine according to the present invention is equally applicable to a washing machine in which a washing tank and a pulsator are separated and separated by a washing shaft and a dewatering shaft interlocked through a clutch. In this case, a clutch member which is responsible for power switching of the washing shaft coupled to the rotor housing and the dewatering shaft coupled to the washing tub may be provided in the inner space of the stator iron core.

So far, the present invention has been described with reference to preferred embodiments thereof, and one of ordinary skill in the art to which the present invention pertains may implement the modified embodiment within the essential technical scope of the present invention. Here, the essential technical scope of the present invention is shown in the claims, and the modified forms within the equivalent range will be construed as being included in the present invention.

An outer rotor type induction motor and a washing machine motor using the same according to the present invention provide the following effects.

First, according to the present invention, as the rotor housing connected to the drive shaft is provided outside the stator iron core, it is possible to produce a larger torque than the conventional inner rotor type induction motor under the same volume.

Second, according to the present invention, as the rotor housing to which the drive shaft is connected is provided with the stator iron core on the outside, the inner space of the stator iron is secured, and when the clutch is provided to switch the power of the washing shaft through the space, It can increase.

Third, according to the present invention, as any one of the main coil or the auxiliary coil is provided in any stator slot, the process of winding the coil to the stator core can be automated, which enables mass production to lower the production cost. Can be.

Claims (6)

A rotor housing of the magnetic body through which the driving shaft is coupled; A rotor conductor provided on an inner circumferential surface of the rotor housing and forming a closed circuit; A plurality of steel sheets are stacked and provided in the rotor housing so as to maintain a predetermined gap with the rotor conductor, and the number of stator slots formed at regular intervals along the outer circumference of the continuous steel sheet has a maximum number of poles. Quadruplicate stator iron; An outer rotor type induction motor including a coil wound directly on the stator slot in a distribution zone so that the main coil and the auxiliary coil are not commonly wound in any stator slot. The method of claim 1, 32 stator slots are formed so that eight poles are formed, and the outer rotor type induction motor is characterized in that 40 to 48 rotor bars are inserted into the rotor conductor. The method of claim 1, 24, the stator slot is formed so that six poles are formed, the outer rotor type induction motor, characterized in that 30 to 36 rotor bars are inserted into the rotor conductor. A rotor housing provided under the bearing housing and having a washing shaft coupled to a washing tub or a pulsator on the bottom of the washing tub to penetrate through a bottom center thereof; A rotor conductor provided on an inner circumferential surface of the rotor housing and forming a closed circuit; The stator slot is coupled to the bottom surface of the bearing housing, and a plurality of steel sheets are stacked to maintain a predetermined gap with the rotor conductor in the rotor housing. The stator slots are formed at regular intervals along the outer circumference of the continuous steel sheet. Stator cores whose number is four times the pole number; A motor for a washing machine comprising a coil directly wound around the stator slot in a distribution zone such that the main coil and the auxiliary coil are not commonly wound in any stator slot. The method of claim 4, wherein 32 stator slots are formed so that 8 poles are formed, and the rotor conductor has 40 to 48 rotor bars inserted therein. The method of claim 4, wherein 24 stator slots are formed so that 6 poles are formed, and 30 to 36 rotor bars are inserted into the rotor conductor.