KR101542923B1 - Enhanced squirrel-cage pole changing motor and two speed hoist comprising the same - Google Patents

Abstract

The present invention relates to a three-phase squirrel-cage pole changing motor and a hoist including the same. The three-phase squirrel-cage pole changing motor according to the present invention includes a stator which includes coils wound around a plurality of slots formed on the inner circumference thereof and a cylindrical rotor which is formed to face the inner circumference of the stator and rotates by a magnetic force generated when a current flows in the coil. The stator includes the coils which are divided into two groups and are wound to make the rotor rotate with two kinds of speeds. A first group is wound to form six poles. A second group is wound to form 24 poles.

Description

TECHNICAL FIELD [0001] The present invention relates to a three-phase special hoop type motor and a two-speed hoist including the hoist,

The present invention relates to a three-phase special-purpose pole-number-converted motor and a second-stage hoist including the same. More specifically, the present invention relates to a three-phase special- And a hoist including the same.

As the industry develops today, the production of complex mechanical devices is increasing, and the products made of these mechanical devices are being transported to various parts of the world.

In manufacturing such complex machines or transporting articles, there are many cases in which objects (parts, articles, etc.) are lifted or lowered up and down. A representative example of such a machine is a hoist.

Here, a hoist is a device for moving an object up and down by winding or unwinding a wire connected to an object, and is roughly divided into an electric hoist and a hydraulic hoist.

1, the electric hoist includes a drum 10, a motor 20 for supplying power, a gear for transmitting power to be supplied to the drum 10, A box 30, and a brake 40 for stopping the rotation of the drum 10. [

In this case, various types of motors can be used for the electric motor 20 depending on the type of object to be moved up and down. Generally, since the power source supplied to the place where the hoist is used is an AC power source, The cage induction motor is mainly used.

An induction motor is a driving device that generates a rotational force by an induction action of a winding, and can change the speed through frequency conversion or pole number conversion. Performs change polynomial conversion through two relays with external control.

However, when such a three-phase squirrel cage induction motor is used as the electric motor 20, it is not easy to realize two kinds of rotational speeds of relatively high speed and low speed. Furthermore, it is more difficult to realize two types of rotational speeds with fewer motor volumes to accommodate hoist motor characteristics.

Conventionally, in order to quickly or slowly selectively move an object, a hoist including the auxiliary electric motor 22 is manufactured as shown in Fig. That is, the high-speed rotation speed is realized through the three-phase squirrel cage induction motor 20 to move the object quickly, and the low-speed rotation speed is realized through the auxiliary motor 22 to move the object slowly.

However, when the auxiliary motor 22 is placed, the structure of the gear box 30 for transmitting the power supplied through the auxiliary motor 22 becomes complicated, and the structure of the drum 10 rotated by the auxiliary motor 22 The auxiliary brake 42 for stopping the auxiliary brake 42 is further required.

In addition to the complexity of the gear box 30 and the addition of the auxiliary storage box 50 and auxiliary brake 42, other components (e.g., bearings, housings, etc.) It may be more complicated or more involved.

The complexity of components and the inclusion of additional components in this way means that there are additional mechanical factors, which not only increase the manufacturing cost of the hoist, but also cause various problems such as difficulty in control between mechanical elements and shortening of life due to wear .

The technical object of the present invention is to solve the problems mentioned in the background of the present invention and provide a three phase special pole type number conversion motor capable of implementing two kinds of rotation speeds of high speed and low speed without any additional mechanical element and a hoist including the same .

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not intended to limit the invention to the precise form disclosed. There will be.

A stator formed by winding a first coil forming six poles and a second coil forming the twenty-fourth pole in one slot so that the ratio of the low and high speeds of the present invention is 1: 4, And a pitch of the coil spacing of the stator slots is set so that the pitch of the first coils is a three-phase special crowd number of pitches of 13 pitches In the conversion motor, the current flowing into the first coil and the second coil is configured to be independently controlled.

Here, the pitch of the second coil may be four pitches.

In addition, the current flowing into the first coil or the second coil can be controlled so as to be automatically cut off after a time set by the user.

Also, the current flowing into the first coil is cut off after a time set by the user, and current flows into the second coil at the same time, or the current flowing into the second coil is cut off after a time set by the user, Can be controlled to flow.

The stator may have an outer diameter of 270 mm and an inner diameter of 195 mm.

When the motor of the present invention constitutes a 3.7-kW three-phase special-purpose pole-number-changing motor, the first coil is wound with a diameter of 1.00 mm by 13 turns, and the second coil has a thickness of 0.85 mm. Can be wound 38 times.

When the motor according to the present invention constitutes a 5.5 kW three-phase special pole-type number-of-pole transforming motor, the coils of the first group are coils having a thickness of 1.00 mm, coils having a thickness of 0.90 mm, coils having a thickness of 0.85 mm Each of the coils of the second group may be wound with a coil of 0.80 mm in thickness by 32 turns, and a coil of 0.75 mm in thickness by a distance of 32 turns.

A second-speed hoist of the present invention comprises: a three-phase special-purpose brushless motor according to any one of claims 1 to 7; a wire drum provided so that the wire is wound or unwound as the wire rotates; A gear box for transmitting power to the drum, and a brake for stopping the rotation of the drum.

At this time, the brakes can independently control the first speed and the second speed of the electric motor.

In addition, the wire drum may be provided with a groove such that the wire is not pushed left or right when the wire is wound or unwound.

In addition, the wire drum may be provided with a separation preventing frame along the longitudinal direction of the outer circumferential surface so that the wire is not separated.

In addition, the wire drum may include a drum disk flange for connection with the electric motor.

According to the present invention, two types of rotational speeds can be realized without additional mechanical elements, and the hoist including the rotating speed can also be used to move the object up and down at a high speed It can operate in two kinds of low speed.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description of the claims.

1 is a cross-sectional view of a conventional hoist.
FIG. 2 is a cross-sectional view illustrating an embodiment of a hoist including a three-phase special damping pole-number converting motor according to the present invention.
FIG. 3 is a perspective view of the hoist shown in FIG. 2, partially cutaway.
FIG. 4 is a perspective view of the hoist shown in FIG. 3, in which only a three-phase special hoop type pole-number-converted electric motor is partially cut away.
FIG. 5 is a perspective view illustrating the three-phase special hyperplane transformer shown in FIG.
6 is a perspective view showing only the stator among the constituent elements of the 33-phase special hyperbolic transformer motor shown in FIG.
Fig. 7 is a schematic view showing the static cross-section of the stator shown in Fig. 6, including the contents arbitrarily shown in order to explain the contents in which the coil is wound.
Figs. 8 and 9 are schematic diagrams each showing an enlarged view of part A and part B of Fig. 7 in order to explain in detail the contents wound on the coil included in Fig.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, the well-known functions or constructions are not described in order to simplify the gist of the present invention.

Moreover, in describing the present invention, terms indicating directions such as forward, backward, and upward / downward directions are described so that those skilled in the art can clearly understand the present invention, and the directions indicate relative directions, It is not limited.

Generally, pole-changing motors have 2/4, 2/12, 4/6, 4/8, 6/8, 6/12 pole motors. Although there are more pole change motors in general, there is a difference in frame and speed for general hoist hoist hoist hoist hoist hoist hoist hoop hoist hoop hoist hoop hoist hoop hoist hoop hoist hoop hoop hoop hoop hoop hoop hoop hoop hoop hoop hoop hoop hoop hoop hoop hoop hoop hoop hoop hoop hoop hoop hoop hoop hoop hoop hoop hoop hoop hoop hoop hoop hoop hoop hoop hoop hoop hoop hoop hoop hoop hoop hoop hoop hoop

The hoist has a first-class hoist and a second-class hoist. A first-speed hoist drives one motor and uses it at one speed. In case of 2-speed hoist, two motors are driven separately and a mechanical speed converter is also required.

The second-speed hoist has a problem in that it shortens the life of the product due to frequent operation of the mechanical speed converter required when using two motors, resulting in damage to the product. SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a three-phase dc voltage converting motor for a hoist hoist that can be used for a two-phase hoist without using a mechanical speed converting device.

It is known that the high speed and the low speed suitable for the hoist are suitable for the users to feel about 5m at the high speed and 1m per minute at the low speed.

In this invention, low speed and high speed poles are generally composed of 24 poles / 6 poles in order to make the speed ratio of 1: 4 in terms of user convenience and control efficiency. Of course, the ratio of other poles such as 2 pole / 8 pole, 4 pole / 16 pole, 8 pole / 32 pole can be numerically expressed as 1: 4 speed ratio, Is not suitable.

In the case of conventional hoist motors or general pole number conversion motors, eg pole change motors (pole change motors) such as 2 poles / 8 poles, 2 poles are implemented at 3600 rpm / m and used for high speeds, / m and can be implemented at low speed. However, due to the high rpm of the two poles, the possibility of breakage increases as the motor shafts become more crowded. In order to compensate for this, it has been found out that it is not suitable as a hoist motor because expensive shafts and larger size motor shafts must be manufactured lost. The 4-pole / 16-pole is operated at a speed higher than the speed suitable for the hoist described above. Therefore, when the hoist is used for hoisting, the speed of the existing reducer must be changed to change the structure of the reducer. In order to change the structure of the reducer, And it is impossible to apply it to existing hoist because the size of motor becomes larger in case of 8 pole / 32 pole. Such motors with 2-pole / 8-pole, 4-pole / 16-pole, 8-pole / 32-pole decrease the efficiency of the motor as a result. In this regard, Applicant has found that it is best to use a 6 pole / 24 pole motor for hoisting purposes to minimize the above problems and optimize hoist performance.

That is, when a conventional speed reducer is employed, a general pole number conversion motor such as a 2P / 8P pole change motor can not realize a high speed and low speed hoisting speed suitable for a hoist. Therefore, two motors are artificially employed, It can only implement low speed (so-called mechanical double motor). However, as described in the background section, when the number of electric motors is two in one hoist, the hoist manufacturing cost is raised as well as the structure of the hoist is complicated.

In order to manufacture a motor in which two different motors and mechanical devices are not required and a high speed and a low speed are applied to a hoist for a desired value in the market, the present applicant has proposed a six- A conversion motor has to be adopted.

On the other hand, in the case of a hoist motor, although the speed itself is important, it is generally desirable to increase the size of the motor (increase the number of poles), because momentary maneuvering power (momentarily lifting a heavy object) Since the hoist is basically a lifting device, infinitely increasing the weight and volume of the hoist body itself may lead to a problem of deteriorating the efficiency of the hoist mechanism itself although the maneuverability may be improved. Therefore, the number of poles can not be increased indefinitely.

In this respect, it has been found by the applicant that the 6P / 24P pole transforming motor is the most suitable for hoisting, but also exhibits the optimum speed and maneuvering power relative to the size of the motor (if the number of poles is increased further, And if you reduce the number of poles, the speed and maneuver will be below the required value).

Conventional leading manufacturers of motors have attempted to develop a pole change motor for 6 / 24P hoists, but all of them have failed, and the place where a 6 / 24P motor can be developed for a hoist at present is unknown other than the present applicant.

The reason why the other company failed to develop the pole change motor for 6 / 24p hoist like the present invention can be summarized as follows.

First, the number of slots is preferably 72 to implement a 24P motor. Due to the characteristics of the hoist, it is very difficult to manufacture a 72 slot stator in order to miniaturize the motor (for reference, there are 48 slots in the 2 / 8P motor stator). This is because the motor is small and the number of slots is 72, which increases the degree of difficulty. In particular, since the number of slots in the rotor is also 72, the operation becomes very inefficient.

Second, in order to solve this difficulty, the stator size must be increased. In this case, the slot size must be increased at the same time. In this case, since the efficiency of the work is increased through the increase of the overall size, However, there is a problem that overheating occurs as the starting current increases at 6P. (Since the starting torque is longer than Λ in the graph, it takes a long time to start the engine, so it can not be commercialized due to excessive heat generation). Also, as the size increases, there is a problem that unbalance occurs as a whole. This unbalance causes not only the appearance but also the center of gravity to deviate to the motor, resulting in the overall structural instability.

Third, if the size is reduced to eliminate overheating at 6P, the problem of size increase can be compensated to some extent. However, at this time, the current increases at 24P, and overheating occurs, .

Therefore, it is very important to find the optimum value of the coil thickness and the number of turns of the coil which affect the stator diameter, inner diameter, pitch, etc., dimensions of the stator and the dimensions of the stator in the 6/24 motor. In other words, thin coils can be wound with a large number of coils to obtain the desired magnetic force, but coarse coils can be wound with a small number of coils, all affecting the size of the stator and, of course, affecting the specification of the rotor affected by the stator inner diameter. To determine the motor specification.

First, an embodiment of a hoist according to the present invention will be described with reference to FIGS. 2 and 3. FIG.

2 is a cross-sectional view showing an embodiment of a hoist including a three-phase special hoop type pole-transforming motor according to the present invention, FIG. 3 is a perspective view of a hoist shown in FIG. 2, to be.

2 and 3, an embodiment of a hoist according to the present invention may include a wire drum 100 and a three-phase special-purpose pole-number-converted electric motor 200.

Here, the wire drum 100 is a cylindrical component in which a wire connected to an object is wound. The wire drum 100 is a part of the wire drum 100 in which the hoist according to the present invention is used, the capacity of the three- Length, thickness, and the like may vary.

The wire drum 100 may be provided with a groove so as not to be pushed leftward or rightward when the wire is wound or unwound. The wire drum 100 may be provided with a separation prevention frame along the longitudinal direction of the outer circumference so as not to detach the wire. And a drum disk flange 150 for connection with the pole-type pole transforming motor 200 may be provided.

On the other hand, the three-phase special hoop type pole transforming electric motor 200 is a component that provides power to rotate the wire drum 100 to wind or unwind the wire, and is included in an embodiment of the hoist according to the present invention , Which is also applicable to the present invention, will be described later in detail with reference to FIGS. 4 to 9 in addition to FIG. 2 and FIG.

In addition to the wire drum 100 and the three-phase special-purpose pole-number-converted electric motor 200, an embodiment of the hoist according to the present invention may further include the reduction unit 300, the brake unit 400, .

Here, the deceleration unit 300 is a component for transmitting the power provided from the three-phase special-gravity type pole-transforming electric motor 200 to the wire drum 100, and a plurality of gears may be configured in the form of gearboxes connected to each other, But is not necessarily limited thereto.

In the deceleration unit 300, only one electric motor (three-phase special-purpose pole-number-converted electric motor 200) other than the two electric motors as described above in the background of the invention is used in an embodiment of the hoist according to the present invention As far as included, it can be composed of only one unit corresponding to one electric motor, and thereby it is possible to eliminate the additional mechanical elements that the present invention intends to solve. However, the deceleration unit 300 according to the present invention is characterized in that the speed control is possible in both the low speed mode and the high speed mode, and the brake unit is also the same in the low speed mode and the high speed mode. More importantly, the decelerating unit and the brake unit of the present invention are characterized in that the speed of each of the decelerating unit and the brake unit is controlled according to the amount of the current flowing into the respective coils of the low speed mode and the high speed mode. Therefore, the currents of the low-speed coil and the high-speed coil are independently controlled, so that the speed control of the hoist, in particular, the inching is easier.

In the case of a hoist, if the operation stop-restart operation is continuously repeated, the operation is stopped and then restarted, the necessary torque for lifting the weight must be exerted, Personality is very important.

On the other hand, the brake unit 400 may be constituted in any way as long as it can stop the wire drum 100 as a component required to stop the rotating wire drum 100.

That is, as shown in FIG. 2 and FIG. 3, it may be mounted on the opposite side of the wire drum 100 on which the three-phase special-purpose brushless motor 200 is mounted. 200 may be connected.

In one embodiment of the hoist according to the present invention, which can be configured as described above, the operation mode of the three-phase special-purpose brushless motor 200 is changed in accordance with the condition of moving the object up and down, It can be moved slowly.

That is, the three-phase special-purpose pole-type alternating-current motor 200 can operate in two modes, which are classified into a high-speed mode or a low-speed mode, corresponding to the condition of moving the object up and down.

4 and 9, the high-speed mode and the low-speed mode will be briefly described first. In the high-speed mode, the first group of coils wound around the stator 210 at 13 pitches 232 are formed, six poles are formed, and the rotor 220 is rotated at a relatively high first speed to relatively move the object. The low speed mode is wound on the stator 210 at four pitches When a current flows through the second group of coils 234, 24 poles are formed and the rotor 220 rotates at a relatively low second speed to move the object relatively slowly.

4 to 9, a hoist according to an embodiment of the present invention includes a three-phase special hoop type transformer motor according to an embodiment of the present invention 200 , an embodiment of a hoist according to the present invention will be described with reference to a drawing as an example of a component ).

FIG. 4 is a perspective view showing only a three-phase squirrel cage induction motor according to an embodiment of the hoist shown in FIG. 3, and FIG. 5 is a cross-sectional view of the three- FIG. 6 is a perspective view illustrating only a stator among the components of the three-phase special-purpose brushless motor shown in FIG. Fig. 7 is a schematic view of the stator shown in Fig. 6, including the contents arbitrarily shown in order to explain the contents of the coil being wound, and Figs. 8 and 9 are views showing the coil included in Fig. 7 7A and 7B are enlarged views of the portions A and B, respectively, in order to explain the winding in more detail.

4 to 9, the three-phase special-purpose brushless motor 200 according to the present invention may include a stator 210 and a rotor 220.

Here, the stator 210 is a component called a stator, and the coils 230 are wound around a plurality of slots 212 provided on the inner circumferential surface.

At this time, the rotation speed of the rotor 220, which will be described later, may be changed depending on how the coil 230 is wound around the slot 212 of the stator 210. In the following description of the rotor 220, Will be described in detail later.

The rotor 220 is a component called a rotor and is formed in a cylindrical shape so as to face the inner circumferential surface of the stator 210 and rotates due to a magnetic force transmitted when a current flows through the coil 230.

The rotation speed of the rotor 220 may vary according to how the permanent magnet is disposed. In the present invention, how the coil 230 is wound around the slot 212 of the stator 210 is a technical feature. The description of which will be omitted. It will be understood by those skilled in the art that it is not necessary for those skilled in the art to understand the present invention to be applied to the present invention.

Next, the technical characteristics of the present invention will be described while explaining various experiment examples related to how the coil 230 is wound around the slot 212 of the stator 210, as described above.

First, before describing each experimental example, basic assumptions and definitions will be described in an embodiment 200 of a three-phase special hyperplane transformer motor according to the present invention.

Since the embodiment 200 of the three-phase special hyperbolic transformer motor according to the present invention is based on the premise that the rotor 220 can be rotated at two kinds of rotational speeds, the coil 230 is divided into two groups And is wound.

At this time, the first group of coils 232 are wound so as to form six poles, and when a current flows in the first group of coils 232, the rotor 220 rotates at a relatively high speed . The second group of coils 234 are wound so as to form twenty four poles. When current flows through the second group of coils 234, the rotor 220 rotates at a relatively low speed.

Meanwhile, the coils 230 are wound in a bundle-type fashion. The spacing between the slots 212 in which a bundle of coils 230 is wound is referred to as a pitch.

Further, when the coil 230 is wound in a dosing manner, if it is referred to as one bundle reference 2 strand, it means that it is doubly wound. 8, apart from the coil 230 being wound in several bundles, as shown in FIG. 9, one bundle of reference is formed by two strands, and one coil of the coil is wound 13 times A total of 76 coils 230 on a sectional plane basis are considered to be wound if the coil 2 is wound 38 times, that is, a total of 26 coils 230 are wrapped around the reference plane (the first group of coils 232 is taken as an example) (The second group of coils 234 is taken as an example).

In other words, a single bundle is said to be a single strand, and a double bundle is a double strand. Of course, in the double winding process, two bundles each wound with a coil of one wire may be inserted into the slot 212, and one bundle wound with coils of two wires may be inserted into the slot 212.

If so, it will be necessary to distinguish one bundle from one strand, whereas one bundle must be separately isolated through insulating paper, whereas one strand is contained in one bundle, so it does not have to be separately isolated through insulating paper. That is, in FIG. 8, it is not limited to one strand but one bundle in addition to one group for forming the pole, based on the insulating paper shown in the slot.

For reference, the distinction between a group that forms a bundle and a pole is a pitch number, not an insulating paper. That is, not only one bundle is divided into an insulating paper but also the first group of coils 232 and the second group of coils 234 are separated by insulating paper.

In addition, the insulating paper is a member for preventing the energization between the coils 230. If the energization can be prevented, there will be no limit to the shape and structure as well as the material.

In addition, terms related to the winding method, the wire method, and the copper wire referred to in the description of each of the experimental examples will be easily understood by those skilled in the art and will not be described in detail in the present specification.

The hoist motor according to the present invention is characterized in that 1) the 72 slots provided on the inner circumferential surface of the stator are divided into two groups so that the coils are wound in a dosing manner, and when the spacing of the slots in which a bundle of coils is wound is a pitch, The first group of coils being wound to form six poles at 13 pitches and the second group of coils being wound to form twenty four poles at four pitches and 2) And is rotated at a first speed when six poles are formed in the stator and is rotated at a second speed when twenty-four poles are formed in the stator It is noted that in the high-speed mode, six poles are rotated at the first speed, and in the low-speed mode, twenty-four poles are controlled to rotate at the second speed. And a C..

Furthermore, in the case of using a 72-slot stator, the 3-phase special floating-point converter motor according to the present invention is not suitable for a conventional large-capacity output motor, and is applicable only to a case where the output is 3.7 KW or 5.5 KW for a hoist have.

Also, it may be specified that the outer diameter of the stator is 270 mm and the inner diameter is 195 mm, which is suitable for the 3.7 KW or 5.5 KW motor stator for the second-speed hoist. When the motor of this standard according to the present invention is used, a small-sized motor that can be used for a hoist can be realized when the outer diameter and the inner diameter of the stator are as above, and a desired effect can be obtained.

In this respect, the hoist motor of the present invention is characterized in that, in comparison with a general-purpose motor, a rotor can be rotated at two rotational speeds without a separate mechanical speed converter through a single transmission, So that a single hoist is capable of both low speed and high speed operation.

Further, the hoist motor of the present invention is used for hoisting a heavy body, has to be easy to control the speed, and is specialized for hoisting, in which work should be easy, such as inching (meaning that the circuit is shut off before the motor reaches a normal speed) .

The hoist motor according to the present invention is characterized in that two kinds of coils, not one type of coil, are wound into a single group in a group, so that the phase change of the alternating current supplied to the coils by winding one kind of coils This is also different from the method of converting the number of poles.

In the present invention, since the currents of the two groups, that is, the high-speed group and the low-speed group are independently controlled, that is, the speed of each group is independently controlled. Is improved over conventional motors that regulate the speed in such a way as to rewind and supply current only to a portion of the coil.

That is, in the present invention, the two coil groups formed in one slot are responsible for the high-speed region and the low-speed region, respectively (i.e., one group operates when the high-speed button is pressed on the hoist and the other two groups operate when the low- assignment). In this case, a single winding method is used when supplying current to all two groups or supplying current to only one group, depending on the case of low speed and high speed. In this case, the ratio of low speed and high speed is 1: 2. However, in the case of the present invention, since various speed ratios can be implemented according to the pole ratio (6:24, i.e., 1: 4), an effect suitable for use for a hoist can be achieved.

However, in the present invention, the coils of each group take charge of the low-speed and high-speed regions independently. For this purpose, the number of poles of each coil and the number of pitches for realizing an appropriate output are determined. The optimal number of slots, coils, group / pole / thickness / strand / number of wheels, number of pitches, etc. of the stator should be determined based on the experimental data.

The hoist motor of the present invention limits the speed ratio to 1: 4 and limits the high speed pole to six poles. Therefore, the low-speed pole should be 24 poles. In order to implement twenty-four poles, a minimum of 72 slots of the stator is preferred, so the number of slots is limited to 72 in the present invention. To implement the 72 slot, the hoist must be rewound at 11 or 13 pitches to obtain the starting torque required to instantaneously lift the weight (if the pitch is less than 11 or 13 pitches, the desired starting torque may be implemented, Efficiency is lowered due to excessive heat generation, and efficiency is increased when the number of pitches is more than 11 or 13 pitches, but the desired starting torque can not be realized). Among these, winding at 13 pitches is more preferable (That is, 13 pitches are selected without selecting 11 pitches because 13 pitches are easier to work than 11 pitches in winding work).

All experiments were optimized according to the regulations of the Korea Occupational Safety and Health Administration.

Experimental Examples 1 to 6 are experimental examples in which the number of slots 212 provided in the stator 210 is 54. Experimental Examples 7 to 11 are examples of the stator The number of the slots 212 provided in the slot 210 is 72.

In this case, the size of the stator 210 and the slot 212 must also be adjusted in order to increase the number of the slots 212 to 72, which will be described below in connection with Experimental Example 7.

Experimental Example 1

Experimental Example 1 is a case in which the first group of coils forming six poles in 54 slots are spaced at 8 pitches and the second group of coils forming 24 poles are spaced at four pitch intervals, A normal magnetic force was generated in one group of coils and the rotor could be rotated at a high speed. However, no magnetic force was generated in the second group of coils forming the 24 poles, and the rotor could not be rotated.

Experimental Example 2

Experimental Example 2 is a case in which the first group of coils forming six poles in 54 slots are spaced at 8 pitches and the second group of coils forming 24 poles are spaced at 3 pitch intervals.

According to Experimental Example 2, a normal magnetic force was generated in the first group of coils forming six poles and the rotor could be rotated at a high speed. However, a magnetic force is generated in the second group of coils forming the 24 poles, The rotor could not be rotated.

Experimental Example 3

In Experimental Example 3, the first group of coils forming six poles in 54 slots are spaced at 8 pitches and the second group of coils forming 24 poles are spaced at 5 pitch intervals.

According to Experimental Example 3, a normal magnetic force was generated in the first group of coils forming the six poles to rotate the rotor at a high speed. However, magnetic force was generated in the second group of coils forming the 24 poles, The rotor could not be rotated.

Experimental Example 4

In Experimental Example 4, the first group of coils forming six poles in 54 slots are spaced at 8 pitches, and the second group of coils forming 24 poles are spaced at 6 pitch intervals.

According to Experimental Example 4, a normal magnetic force was generated in the first group of coils forming six poles to rotate the rotor at a high speed, but a magnetic force was generated in the second group of coils forming the 24 poles. However, And the rotor was not rotated because the size was smaller than that of Experimental Example 3.

Experimental Example 5

In Experimental Example 5, the first group of coils forming six poles in 54 slots are spaced at 8 pitches, and the second group of coils forming 24 poles are spaced at 7 pitch intervals.

According to Experimental Example 5, a normal magnetic force was generated in the first group of coils forming six poles to rotate the rotor at a high speed, but a magnetic force was generated in the second group of coils forming the 24 poles. However, To the rotor of Experimental Example 4, the rotor could not be rotated.

As can be seen from Examples 3 to 5, when the pitch interval of the second group of coils forming the 24 poles is increased, it can be seen that the magnetic force is not generated any more.

Experimental Example 6

Experimental Example 6 is a case in which the first group of coils forming six poles in 54 slots are spaced at 8 pitches and the second group of coils forming 24 poles are spaced at four pitches as in the experiment described above, As a method, the double winding method was adopted.

According to Experimental Example 6, as in Experimental Example 1 described above, a normal magnetic force was generated in the first group of coils forming the six poles and the rotor could be rotated at a high speed. However, the second group of coils No magnetic force was generated and the rotor could not be rotated.

It can be confirmed that it is difficult to realize the low-speed rotation of the rotor when the number of slots is 54 as in the first to sixth experiments.

Experimental Example 7

In Experimental Example 7, the first group of coils forming six poles in 72 slots were spaced at 13 pitches and the second group of coils forming 24 poles were spaced at four pitches, The first group of coils forming the six poles was delta-connected to the second group of coils forming the twenty-four wires, while the coil of the second group Were also experimented.

At this time, in order to place 72 slots in the stator, the outer diameter and the inner diameter of the stator were made larger than those used in Experiments 1 to 6 above.

According to Experimental Example 7, unlike Experimental Examples 1 to 6, a certain amount of magnetic force was generated but a sufficient rotational force could not be obtained. At 6p, the starting current increased and overheating occurred.

Experimental Example 8

In Experimental Example 8, the first group of coils forming six poles in 72 slots were arranged at 13 pitch intervals and the second group of coils forming 24 poles were arranged at 4 pitch intervals in the same manner as Experimental Example 7, , And the winding method is a double winding method. The wiring method is the same as that of the first group coil forming the six poles and the second group coil forming the twenty-four pole Change.

Further, as the outer diameter and the inner diameter of the stator are changed, the thickness, the number of strands, and the number of wheels of each group are changed.

According to Experimental Example 8, although a certain amount of magnetic force was generated as in Experimental Example 7 described above, sufficient rotational force was not obtained, and overheating occurred.

Experimental Example 9

In Experimental Example 9, the first group of coils forming six poles in 72 slots were arranged at 13 pitch intervals and the second group of coils forming 24 poles were arranged at 4 pitch intervals in the same manner as Experimental Example 8, , The winding method is a double winding method, and the wiring method is the same as the first group coil forming the six poles and the second group coil forming the twenty-four poles by wire connection , The lamination of coils and the number of wheels of thickness were changed differently from Experimental Example 8 as described above.

According to Experiment Example 9, not only a normal magnetic force is generated in both the coils of the first group forming the six poles and the coils of the second group forming the twenty-four poles but also a sufficient rotational force to rotate the rotor at high speed and low speed . Thus, it was confirmed that a desired effect can be achieved by combining the number of slots, the size of the stator, the number of stacked layers, the coil thickness, and the number of wheels.

However, considering the magnitude of the load acting on the motor, Experimental Example 9 is considered to be advantageous in the case of constructing a 3.7-kW class 3-phase special-purpose pole-number-converted motor, and as in Experimental Example 9, One embodiment (200) of the special crushing pole transformer motor is constituted by a 3.7 ㎾ class 3 phase special crushing pole transformer motor and tested again with the rated load (3 tons) according to Industrial Safety Management Corporation regulations. As a result, it was confirmed that the current value, the magnetic force, the temperature, and the noise were in the acceptable range.

As described above, an embodiment 200 of the three-phase special-gravity pole-number-converted motor according to the present invention is constituted by a 3.7-kW three-phase special- Further experiments were conducted as in Experimental Example 10 and Experimental Example 11 to find further favorable cases for 5 tons.

Hereinafter, a motor suitable for a rated load of 5 tons will be described with reference to Experimental Examples 10 and 11 below.

Experimental Example 10

In Experimental Example 10, in the same manner as in Experimental Example 9, the first group of coils forming six poles in 72 slots are arranged at 13 pitch intervals, the second group of coils forming 24 poles are arranged at 4 pitch intervals, The first group of coils forming the six poles and the second group of the coils of the second group forming the twenty-four poles are the same as those of the twin-winding method. 9 coils, and the thickness of the wheels.

According to the experimental example 10, although a certain amount of magnetic force was generated, a sufficient rotational force as compared with the rated load was not obtained.

Experimental Example 11

In Experimental Example 11, the first group of coils forming six poles in 72 slots are arranged at intervals of 13 pitches, the second group of coils forming 24 poles are arranged at four pitch intervals, The first group of coils forming the six poles and the second group of the coils of the second group forming the twenty-four poles are the same as those of the twin-winding method. 10, the lamination of coils and the number of wheels were changed.

According to the experimental example 11, a normal magnetic force is generated in both the first group of coils forming the six poles and the second group of coils forming the twenty-four poles, and the rotor is rotated at high speed and low speed Sufficient torque was obtained.

In other words, considering the above-mentioned load size, Experiment 11 is considered to be advantageous in the case of constructing a 5.5 kW three-phase special-purpose pole-number-converted motor, and as in Experimental Example 11, An embodiment 200 of the special bulking pole transformer motor was configured with a 5.5 kW three phase special crushing pole transformer motor and tested again under the rated load (5 tons) according to the Industrial Safety Management Corporation regulations. As a result, it was confirmed that the current value, the magnetic force, the temperature, and the noise were in the acceptable range.

The coils 230 are wound around the stator 210 in two groups so that the rotor 220 can be rotated at two different speeds. The first group of coils 232 are wound to form six poles, and the second group of coils 234 are wound to form twenty-four poles, and more specifically, it is advantageous to be wound as follows.

That is, if the embodiment 200 of the three-phase special brush-type poles number conversion motor according to the present invention is constructed of a 3.7 kW three-phase special brush type pole number conversion motor, the first group of coils 232 is 1.00 mm thick And it is advantageous to wind the second group of coils 234 by a total of 38 turns with a thickness of 0.85 mm.

In the meantime, if one embodiment 200 of the three-phase special brush-type poles number conversion motor according to the present invention is configured with a 5.5 kW three-phase special brush type pole number conversion motor, the first group of coils 232 is 1.00 mm in thickness A coil of 0.90 mm in thickness and a coil of 0.85 mm in thickness are each wound by 9 turns, and the coil of the second group 234 is wound with a coil of 0.80 mm in thickness by 32 turns, It will be appreciated by those skilled in the art that it is advantageous to allow the coils of thickness to be twisted by 32 turns.

At this time, in the second group of coils 234, the coils having a thickness of 0.75 mm are doubly wound 32 times as described above, that is, two coils of 0.75 mm thick on one bundle basis, It is said that there are two coils wound.

Of course, the coil of the first group of coils 232 is wound to form six poles, while the second group of coils 234 is wound to form twenty-four poles, It is natural to say that it is within the scope of the present invention to allow the user to selectively rotate between the high speed and the low speed.

In addition to the stator 210 and the rotor 220, an embodiment of the three-phase special-purpose brushless motor of the present invention includes a motor rotation shaft 240, a frame 250, an electric motor flange 260, A cover 270, and the like, and these components are components that can be freely modified by those skilled in the art without limiting the scope of the present invention, so a description thereof will be omitted .

As described above, according to the three-phase special-purpose brushless motor of the present invention and the hoist including the three-phase special-purpose brushless motor, two types of rotational speeds can be realized by using only one three- The object can be moved up or down selectively, either quickly or slowly, through the hoist without mechanical elements.

Hereinafter, a process for implementing the speed control, that is, the inching performance of the hoist motor according to the present invention will be described.

In the start / stop control circuit of the motor, if the start button is pressed, the motor starts, and then the start button is released, the magnetic contactor is energized by the self-holding circuit so that the motor can continue to rotate. On the contrary, the inching operation controls the motor only while the button (or pushbutton switch, PBS) is pressed and the motor stops when the hand is released from the inching button. The motion of the motor is called inching operation. This inching operation plays a key role in the performance of the motor for the hoist because the operation of the minute time is repeated many times in order to operate the machine for a short time.

In the present invention, as described above, the amount of current flowing into the first coil and the second coil is independently controlled. Therefore, the speed control of high speed and low speed can be performed independently without being influenced by any other coil.

In addition, the three-phase special-purpose brushless motor of the present invention continuously repeats the operations such as operation-stop-restart operation and up-down-up operation, and operates at a predetermined distance set by the user during high speed and low speed inching operation. And the amount of current flowing into the coils to temporarily stop can be controlled, respectively. In addition, the amount of the current flowing into the coils can be controlled so that the pause time can be set by the user and can be restarted again after the predetermined time.

In addition, the speed control of the three-phase special-purpose brushless motor of the present invention can be controlled to operate in a low speed mode for a predetermined time and then automatically switch to a high speed mode after a predetermined time. For example, during the upward movement, the vehicle can be operated in the low speed mode up to a predetermined travel distance, and automatically switched to the high speed mode when the predetermined travel distance elapses. On the contrary, during the downward movement, the vehicle is operated at a high speed up to a certain moving distance, and can be automatically switched to the low speed mode when the predetermined moving distance elapses. Such a unique control method can be implemented because both the first coil and the second coil take charge of high speed and low speed, respectively, and they are controlled independently.

Such inching performance is determined according to the pitch of the slots. Of course, in addition to the pitch, the relationship between the diameter of the stator and the number of poles affects it, but it is more closely related to the heat generation characteristics of the poles than the inching performance itself. In other words, taking the 6/24 motor of the present invention as an example, the diameter of the stator is determined by the 24 poles of a larger number of poles, while the relatively small number of poles is advantageous in controlling the heat generation due to the divergence of heat. The heat dissipation decreases and the heat becomes larger.

Hereinafter, an experimental procedure for determining the pitch of twenty-four poles in the case of 13 pitches of 6/24 and 72 slots of the present invention will be described.

Pitch Determination Experimental Example 1

In the case of the above three pitches, the experimental results are as follows.

1) Current (at rated load) 6 poles: 14.1 amp

2) Current (at rated load) 24 poles: 19.5 amp

3) Generation of magnetic noise

4) Temperature 80 degrees or higher

5) Rated load test (3 tons of load-inability): Unthinkable

In the end, inability was impossible.

Pitch Determination Experimental Example 2

In the case of the above three pitches, the experimental results are as follows.

1) Current (at rated load) 6 poles: 9.1 amp

2) Current (at rated load) 24 poles: 20.5 amp

3) Generation of magnetic noise

4) Temperature 80 degrees or higher

5) Rated load test (3 tonnes of load-inchability): Personable

Finally, personality was possible.

Pitch Determination Experimental Example 3

In the case of the above five pitches, the experimental results are as follows.

1) Current (at rated load) 6 poles: 9.1 amp

2) Current (at rated load) For 24 poles: 17.9 amp

3) Generation of magnetic noise

4) Temperature 80 degrees or higher

5) Rated load test (3 tons of load-inability): Unthinkable

In the end, inability was impossible.

In this case, the 6 / 24th and 72th slots of the present invention and the 4th pitch in the case of the 24th pole are optimal in the case of the 13th pitch in the case of the 6th pole.

Hereinafter, a further experimental example will be described in the course of the development of the three-phase special hyperplane-operated alternating-current motor of the present invention.

Additional Experimental Example 1

Further Experimental Example 2

Further Experimental Example 3

Further Experimental Example 4

Further Experimental Example 5

Further Experimental Example 6

Further Experimental Example 7

Further Experimental Example 8

Further Experimental Example 9

Additional Experimental Example 10

Further Experimental Example 11

Further Experimental Example 12

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It is self-evident to those of ordinary skill in the art. Accordingly, such modifications or variations should not be individually understood from the technical spirit and viewpoint of the present invention, and modified embodiments should be included in the claims of the present invention.

10: Drums
20: Three phase induction motor
22: Auxiliary motor
30: Gearbox
40: Brake
42: Auxiliary brake
50: Auxiliary gearbox
100: wire drum
150: drum disk flange
200: Three phase special crushing pole number conversion motor
210:
212: Slot
220: Rotor
230: Coil
232: coil of the first group
234: coil of the second group
240: motor rotating shaft
250: frame
260: electric motor flange
270: Motor cover
300: Deceleration unit
400: Brake unit

Claims (12)

A stator formed by winding a first coil forming six poles and a second coil forming twenty-four poles in one slot so that the ratio of low speed and high speed is 1: 4, and a stator provided opposite to the inner circumferential surface of the stator, And a pitch of the coil spacing of the stator slots is set so that the pitch of the first coils is 13 pitches, As a result,
Wherein a current flowing into the first coil and the second coil is independently controlled,
The stator includes:
An outer diameter of 270 mm, an inner diameter of 195 mm,
In the case of constructing 3.7 kW three phase special crankpole motor,
The first coil is double-wound 13 times with a thickness of 1.00 mm,
And the second coil is wound with a double diameter of 38 turns with a thickness of 0.85 mm.
3 phase special crushing pole number conversion motor. A stator formed by winding a first coil forming six poles and a second coil forming twenty-four poles in one slot so that the ratio of low speed and high speed is 1: 4, and a stator provided opposite to the inner circumferential surface of the stator, And a pitch of the coil spacing of the stator slots is set so that the pitch of the first coils is 13 pitches, As a result,
Wherein a current flowing into the first coil and the second coil is independently controlled,
The stator includes:
An outer diameter of 270 mm, an inner diameter of 195 mm,
When constructing a 5.5 kW three-phase special crane pole-number conversion motor,
The first coil has a coil of 1.00 mm in thickness, a coil of 0.90 mm in thickness, and a coil of 0.85 mm in thickness,
Wherein the second coil is wound with a coil of 0.80 mm in thickness by 32 turns, and the coil of 0.75 mm in thickness is wound by 32 in a double direction.
3 phase special crushing pole number conversion motor. 3. The method according to claim 1 or 2,
And the pitch of the second coil is four pitches. 3. The method according to claim 1 or 2,
Wherein the current flowing into the first coil or the second coil is controlled so as to be automatically cut off after a time set by the user. 3. The method according to claim 1 or 2,
The current flowing into the first coil is cut off after a time set by the user and simultaneously the current flows into the second coil or the current flowing into the second coil is cut off after a time set by the user, Controlled 3 - phase special - purpose polynomial conversion motor. delete delete A three-phase special-purpose brushless motor according to claim 1 or 2, a wire drum for winding or unwinding the wire as the wire rotates, a gear box for transmitting the power supplied by the motor to the drum, A second-rate hoist that includes a brake to stop. 9. The method of claim 8,
Wherein the brakes are configured to independently control the first speed and the second speed of the electric motor. The method of claim 8, wherein
Wherein the wire drum is provided with a groove so as not to be pushed right and left when the wire is wound or unwound. The method of claim 9, wherein
Wherein the wire drum is provided with a separation preventing frame along the longitudinal direction of the outer circumferential surface so that the wire is not separated. 10. The method of claim 9,
Wherein the wire drum includes a drum disk flange for connection with the electric motor.

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