KR20170079694A - Structure of induction motor rotor - Google Patents

Abstract

The present invention improves the efficiency of the induction motor by optimizing the shape of the conductor bar of the rotor. That is, the present invention relates to a rotor structure of an induction motor in which a predetermined double-sided shape is introduced into a conductor bar of a rotor and driven at a low pressure and a high output.
The rotor structure of the induction motor of the present invention is characterized in that the rotor of the induction motor includes a first conductor bar having a double agitated shape and a second conductor bar having an elongated rectangular bar shape, The number of bars is three times that of the rotor.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an induction motor rotor,

The present invention relates to a rotor structure of an induction motor, and more particularly, to optimize the shape of a conductor bar of a rotor to improve the efficiency of the induction motor. That is, the present invention relates to a rotor structure of an induction motor that can drive a high-output power at a low pressure by introducing a predetermined double-sided shape into a conductor bar of a rotor.

BACKGROUND ART [0002] A motor (a motor or an electric motor) is a device that generates electric power by converting electrical energy into mechanical energy, and is widely used in domestic and industrial applications. These motors can be roughly divided into an AC motor (AC motor) and a DC motor (DC motor).

On the other hand, an induction motor of an alternating-current motor can be rotated by an induced magnetic field of the stator and a magnet provided on the rotor by the induced magnetic field of the rotor, and a secondary current generated by a voltage induced in the conductor bar of the rotor , The rotor starts to rotate by the torque generated by the mutual action of the magnetic flux generated by the stator winding, and can be started and operated.

At this time, it is possible to increase the rotating efficiency of the rotor by the interaction between the rotating magnetic flux generated due to the structure of the stator and the induction current generated in the conductor bar of the rotor, so that the structure of the conductor bar for improving the rotating efficiency of the induction motor Many studies have been conducted.

For example, in Korean Patent Publication No. 10-2005-0016291, a rotor of an induction motor includes a conductor bar formed of an inner conductor formed inside an inner slot and formed of a metal having a higher electric conductivity than an outer conductor The rotor structure of induction motor is presented.

In this case, however, there is a problem in that the efficiency of the induction motor operating at a low pressure and a high output can not be sufficiently increased.

Korean Patent Publication No. 10- 2005-0016291 (Feb. 26, 2005)

It is an object of the present invention to provide a rotor structure of an induction motor that improves the efficiency of an induction motor by optimizing the shape of a conductor bar of the rotor.

The present invention relates to a rotor of an induction motor that can drive a high-output power at a low pressure by introducing a predetermined double-sided shape into a conductor bar of a rotor, while improving the torque density per unit current, increasing the power factor, There is another purpose in providing the structure.

The rotor structure of an induction motor according to the present invention comprises a first conductor bar of a double daggered shape and a second conductor bar of a generally elongated square bar shape, And can be arranged in the rotor at three times the number of bars.

Here, the first conductor bar may be formed to have the same length as the second conductor bar.

Further, the first conductor bars may be arranged after at least three or more second conductor bars are arranged.

Here, the induction motor can be applied to a low-voltage high output.

In addition, the first conductor bar can be made of a lower conductor which has a high impedance and is formed on the outer side of the rotor and a lower conductor which has a low impedance and is formed on the inner side of the rotor.

Here, the first conductor bar may be rounded at one side near the axis.

In order to maximize the angular acceleration of the rotor at the rated value, the length of the first conductor bar may be 1 or less and the number of the second conductor bar may be 3 or more times the length of the second conductor bar.

Here, the length of the first conductor bar relative to the second conductor bar may be 1 or less in order to maximize the power factor at the rated value.

In order to maximize the angular acceleration of the rotor in the starting state, the length of the first conductor bars may be 1 or less and the number of the second conductor bars may be 3 or more times the length of the second conductor bars.

The rotor structure of the induction motor according to the present invention is advantageous in that the efficiency of the induction motor is improved by optimizing the shape of the conductor bar of the rotor.

Alternatively, the rotor structure of the induction motor according to the present invention may have a structure in which a predetermined double-sided shape is introduced into a conductor bar of a rotor to drive the rotor at a low pressure and a high output to improve the torque density per unit current, the power factor, There are advantages to be able to.

1 is a view showing a rotor structure of an induction motor according to an embodiment of the present invention.
FIG. 2 is a detailed view of the structure of the second conductor bar and the first conductor bar of FIG. 1. FIG.
3 is a contour diagram of the T / I ratio at the rated value according to the length and number of the first conductor bars of FIG.
4 is a contour diagram of the power factor according to the length and the number of the first conductor bars in Fig.
5 is a contour diagram of the T / I ratio in the starting state according to the length and the number of the first conductor bars in Fig.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It is to be understood that the present invention is not intended to be limited to the specific embodiments but includes all changes, equivalents, and alternatives included in the spirit and scope of the present invention.

Hereinafter, a rotor structure of an induction motor according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a view showing a rotor structure of an induction motor according to an embodiment of the present invention, and FIGS. 2 to 5 are drawings and contour diagrams for explaining FIG. 1 in detail.

Hereinafter, a rotor structure of an induction motor according to an embodiment of the present invention will be described with reference to FIGS. 1 to 5. FIG.

1, a rotor structure of an induction motor according to an embodiment of the present invention includes a first conductive bar 100 having a double-sided form and a rectangular bar having an overall elongated shape 2 conductor bars 200 and the first conductor bar 100 is disposed in the rotor 300 at least three times the number of the second conductor bars 200. [

The second conductor bar 200 is rounded in the vicinity of the axis of the rectangular bar having an overall elongated shape, and a current flows to the upper side of the second conductor bar 200 in order to increase the effective resistance at the time of starting. 200). Therefore, it is possible to reduce the cost by forming a ring around the unused axis at the time of starting.

The first conductor bar 100 is composed of an upper conductor bar 110 and a lower conductor bar 120 and flows to an upper conductor bar 110 having a high resistance at the time of starting, And flows to the lower conductive bar 120 having a low impedance at the time of rated operation, so that heat loss can be reduced.

The upper conductor bar 110 and the lower conductor bar 120 may be formed by die casting through a conductor bar insertion hole or may be separately formed and inserted.

In the present invention, the first conductive bar 100 having a double-sided form is alternately arranged in the rotor 300 of the induction motor in a ratio of 3: 1 with the second conductive bars 200 having an elliptical shape, Maximize the efficiency of the motor.

The first conductor bar 100 and the second conductor bar 200 are installed in the rotor 300 so that the rotating magnetic flux generated due to the structure of the stator when the current is applied to the coil of the stator 300, The rotor 300 is rotated with high efficiency by interaction between the first conductor bar 100 and the second conductor bar 200 of the first conductor bar 100 and the second conductor bar 200.

FIG. 2 is a detailed view showing the structure of the second conductor bar 200 and the first conductor bar 100 shown in FIG.

As can be seen in FIG. 2, the first conductor bar 100 is formed to have the same length as the second conductor bar 200.

Also, the first conductor bar 100 is disposed after at least three consecutive second conductor bars 200 are arranged.

The first conductor bar 100 includes an upper conductor bar 110 having a high impedance and formed on the outer side of the rotor 300 and a lower conductor bar 120 having a low impedance and formed on the inner side of the rotor 300 .

Here, the first conductor bar 100 is characterized in that one side near the axis is rounded.

The first conductor bar 100 and the second conductor bar 200 may be equally spaced and the conductor width of the first conductor bar 100 and the second conductor bar 200 may be the same.

As described above, the first conductor bar 100 is formed to have the same length as that of the second conductor bar 200, and by using three times the number of the second conductor bar 200, 300) can be increased, and the power factor at the rated value can be increased.

FIG. 3 is a contour diagram of the T / I ratio at the rated value according to the length and the number of the first conductor bars 100 of FIG.

3, in order to maximize the angular acceleration of the rotor at the rated value, the length of the first conductor bar 100 is less than 1 and the length of the second conductor bar 200 ) The number of contrasts should be at least three times.

Here, the length and the number of the first conductor bars 100 may affect the angular acceleration performance of the rotor 300 at the rated value.

For example, when the number of the first conductor bars 100 is three times the length of the second conductor bars 200 and the length of the first conductor bars 100 is the same as the length of the second conductor bars 200, The angular acceleration performance of the rotor 300 drops from 3.8 or more to 3.6 or less.

The length of the first conductor bar 100 is the same as that of the second conductor bar 200 but the number of the first conductor bars 100 is greater than that of the second conductor bar 200, The angular acceleration performance of the rotor 300 falls from 3.8 or more to 3.8 or less.

Therefore, when the number of the first conductor bars 100 is more than three times that of the second conductor bars 200 and the length of the first conductor bars 100 is less than the length of the second conductor bars 200, As an area 400, there is an effect that the angular acceleration performance at the rated value of the rotor 300 is maximized.

4 is a contour diagram of the power factor according to the length and the number of the first conductor bars 100 of FIG.

As can be seen from FIG. 4, the first conductor bar 100 uses a length equal to or less than 1 to the second conductor bar 200 in order to maximize the power factor at the rated value.

Here, the length of the first conductor bar 100 affects the power factor at the rated value.

For example, when the number of the first conductor bars 100 is three times the length of the second conductor bars 200 and the length of the first conductor bars 100 is the same as the length of the second conductor bars 200, The power factor drops from 0.94 to less than 0.92 when it increases by a factor of two.

On the other hand, when the length of the first conductor bar 100 is the same as that of the second conductor bar 200, there is almost no change in the power factor according to the number of the first conductor bars 100.

The length of the first conductor bar 100 is less than the length of the second conductor bar 200 regardless of the number of the first conductor bars 100. In this case, There is an effect that this becomes the maximum.

FIG. 5 is a contour diagram of the T / I ratio in the starting state according to the length and the number of the first conductor bars 100 in FIG.

5, in order to maximize the angular acceleration of the rotor in the starting state, the length of the first conductor bar 100 is less than 1 and the length of the second conductor bar 200 is less than 1, 200) The number of contrast is used more than three times.

Here, the length and the number of the first conductor bars 100 affect the angular acceleration performance of the rotor 300 in the starting state.

For example, when the number of the first conductor bars 100 is three times the length of the second conductor bars 200 and the length of the first conductor bars 100 is the same as the length of the second conductor bars 200, The angular acceleration performance in the starting state of the rotor 300 drops from 0.99 or more to 0.98 or less.

The length of the first conductor bar 100 is the same as that of the second conductor bar 200 but the number of the first conductor bars 100 is greater than that of the second conductor bar 200, The angular acceleration performance of the rotor 300 falls from 0.99 to less than 0.95.

Therefore, when the number of the first conductor bars 100 is more than three times that of the second conductor bars 200 and the length of the first conductor bars 100 is less than the length of the second conductor bars 200, As an area 600, there is an effect that the angular acceleration performance in the starting state of the rotor 300 is maximized.

As described above, according to the present invention, the first conductive bar 100 having a double-sided form is arranged in the rotor 300 of the induction motor at a ratio of 3: 1 with the second conductive bar 200 having a rectangular bar- So that the low-voltage high-output characteristic of the induction motor is maximized.

As described above, the rotor structure of the induction motor according to the present invention is advantageous in that the efficiency of the induction motor is improved by optimizing the shape of the conductor bar of the rotor, and a predetermined double-sided shape is introduced into the conductor bar of the rotor, So that it is possible to improve the torque density, the power factor increase, and the starting characteristic per unit current at the rated value.

What has been described above includes examples of one or more embodiments. It is, of course, not possible to describe all possible combinations of components or methods for purposes of describing the embodiments described, but one of ordinary skill in the art may recognize that many further combinations and permutations of various embodiments are possible. Accordingly, the described embodiments are intended to embrace all such alterations, modifications and variations that fall within the spirit and scope of the appended claims.

Claims (9)

In the rotor of the induction motor,
A first conductive bar of a double agglomerated shape; And
And a second conductor bar formed in a generally elongated rectangular bar shape,
Wherein the first conductor bars are arranged in at least three rotors of the second conductor bars. The method according to claim 1,
Wherein the first conductor bar is formed to have the same length as the second conductor bar. The method according to claim 1,
Wherein the first conductor bar is disposed after at least three or more second conductor bars are disposed. The method according to claim 1,
Wherein the induction motor is applied to a low-pressure high-output power. The method according to claim 1,
Wherein the first conductor bar comprises: an upper conductor bar having a high impedance and formed on an outer side of the rotor; And
And a lower conductor bar having a low impedance and formed on the inner side of the rotor. The method according to claim 1,
Wherein the first conductor bar is rounded at one side near the axis. The method according to claim 1,
The length of the first conductor bar is set to 1 or less and the number of the second conductor bars is set to 3 times or more in order to maximize the angular acceleration of the rotor at the rated value. Rotor structure of induction motor. The method according to claim 1,
Wherein the length of the first conductor bar is less than 1 in relation to the second conductor bar so as to maximize the power factor at the rated value. The method according to claim 1,
The length of the first conductor bar relative to the second conductor bar is set to 1 or less and the number of the second conductor bars is set to 3 times or more in order to maximize the angular acceleration of the rotor in the starting state. The rotor structure of the induction motor.

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