JPH06311711A - Multiple-stator induction motor - Google Patents

Abstract

PURPOSE:To obtain a rotor which is low in manufacturing cost and a multiple- stator induction motor which is high in starting torque. CONSTITUTION:The title motor is constituted of an integral rotor 7 in which conductors 6 respectively wound around rotor cores 2 and 3 are connected to each other by forming an integral conductor 9 by gathering and short- circuiting the conductors 6 at every set of an arbitrary number of conductors within a range of <=180 deg.C in electrical angle between the rotor cores 2 and 3, first and second stators 12 respectively wound with windings 10 and 12 on the outside sections facing the rotor cores 2 and 3, and phase shifting device which creates a phase difference between the revolving magnetic fields generated by the stators 12 and 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a single rotor and a plurality of stators, and the plurality of stators have a phase difference between rotating magnetic fields generated around rotor conductors facing them. And a multiple stator induction motor that can generate high torque from low speed to high speed with smooth start,
Particularly, it relates to the integral rotor.

[0002]

2. Description of the Related Art Induction motors having a plurality of stators have been already known from JP-A-49-86807, JP-A-54-29005 and JP-B-2-27920. These plural stator induction motors perform a torque control or a speed control by giving a phase difference between the stator windings to cause a deviation in the rotating magnetic field generated around the rotor. The method of changing the phase difference is to mechanically rotate the stator to provide the phase difference, and to electrically change the connection of the stator windings to provide several types of phase differences. There is something.

The above-mentioned methods are various methods depending on the load or application, such as a case where the torque and speed of the induction motor are freely changed to cope with the load, a case where the speed is increased smoothly at the time of starting, etc. Will be used.

By the way, in the induction motor having a plurality of stators as described above, the torque or speed is controlled by giving a phase difference between the stator windings so that the phase difference works effectively. The rotor is constructed as follows. That is, the first and second rotor cores are axially mounted on the same rotary shaft with a space or a non-magnetic body portion interposed, and a plurality of rotor conductors communicating with the first and second rotor cores are connected to the rotor. It is provided on the outer peripheral portion of the core, and is further configured by resistance short-circuiting a plurality of rotor conductors that are in communication between the first and second rotor cores via a resistance material.

[0005]

Generally, the rotor of an induction motor is a winding type or a squirrel-cage type, and the squirrel-cage type rotor is the mainstream of a general-purpose induction motor. This is because the squirrel cage rotor can be manufactured by the simple method of casting aluminum and is robust. However, since the rotor having a plurality of stators has a resistance material that short-circuits the rotor conductors between the rotor cores in addition to the cage conductor of the rotor of a general induction motor, the rotor is simply cast. Is difficult to manufacture, and the resistance material has a shape protruding to the outer periphery of the rotor, which is a major cause of increasing the manufacturing cost such as an increase in the size of the electric motor.

However, the characteristic of the induction motor having a plurality of stators is largely due to the effect of the resistance material, and even if a phase difference is provided between the rotating magnetic fields in the plurality of stator constructions excluding the resistance material, the torque due to a simple voltage drop is generated. Only reduction effect can be obtained. (See FIG. 8) From the above, the same action as when a resistance material that short-circuits the rotor conductors by resistance is provided between two rotor cores, such as the rotor of an induction motor having a plurality of stators. Technically, it is possible to manufacture a multi-stator induction motor with an integral rotor having two rotor cores, which can be manufactured only by casting the same simple conductor as the rotor of a general-purpose electric motor while maintaining the effect. It is an issue.

[0007]

According to the present invention, there are provided first and second rotor cores axially mounted on the same rotary shaft with a space or a non-magnetic material portion interposed therebetween, and the first and second rotor cores are provided. An integral rotor in which a plurality of conductors mounted on the outer peripheral portion of the rotor core communicate with each other between the first and second rotor cores, and a first rotor provided around the rotor core so as to face each rotor core. First and second stators,
The position between the rotating magnetic field generated around the first rotor core facing the first stator and the rotating magnetic field generated around the second rotor core facing the second stator. In a plurality of stator induction motors having a phase shifter that changes the phase difference, the present invention has the following means for solving the above problems.

That is, a rotor ring in which thin plate cores having a plurality of slots are laminated is provided with a short-circuit ring for short-circuiting all the slots on one of the laminated ends, and on the other hand for each arbitrary number of slots within an electrical angle range of 180 ° or less. A plurality of collective conductors that are collectively short-circuited, and conductors are formed by casting into the plurality of slots to form a rotor portion, and two first and second rotations formed by casting on the same rotating shaft. The child part is a means for solving the above-mentioned problems by forming an integral squirrel-cage rotor in which the respective assembled conductors are butted against each other and axially attached, and the butted assembled conductors are electrically connected by.

As another means, the first and second rotor cores, which are laminated thin plate cores having a plurality of slots, are arranged at an arbitrary interval, and the rotor cores facing each other in the interval between the rotor cores are arranged. A plurality of collective conductor members for collectively short-circuiting a plurality of slots for each arbitrary number of slots within an electrical angle of 180 ° or less are provided in the space between the first and second rotor cores, and A short-circuit ring that short-circuits all the slots to the outer end of the second rotor core, a plurality of aggregate conductors that are aggregate-short-circuited by the aggregate conductor member at an arbitrary number of slots, and a conductor into the plurality of slots by casting. The formed integral squirrel-cage rotor serves as means for solving the above problems.

[0010]

In the present invention, it comprises two stators, an integral rotor having two rotor cores, and a phase shifter for producing a phase difference between the rotating magnetic fields produced by the two stators. In a multiple stator induction motor, a plurality of conductors mounted on the outer peripheral portion of the rotor core between two rotor cores are aggregated and short-circuited for each arbitrary number of conductors within an electrical angle of 180 or less. It is formed into a conductor.

In the prior art, the resistance material in which the conductors communicating with the two rotor cores are resistively short-circuited between the two rotor cores causes a phase difference between the rotating magnetic fields produced by the two stators. When it is provided, a current flows, and the resistance value of this resistance material causes the torque characteristic to have a peculiar characteristic.
In other words, it was an induction motor with a torque characteristic that changes proportionally from the start to the rating.

Generally, as is apparent from the prior art, if a resistance material is removed and a phase difference is provided between the rotating magnetic fields of the respective stators as described above, a voltage drop occurs and the same phenomenon as that the torque is reduced occurs. Changes, but the torque at start-up also decreases, and its application was extremely limited.

In the multi-stator induction motor of the present invention, the above-mentioned resistance material is eliminated, and the conductors of the rotor are collectively short-circuited between the rotor cores by an arbitrary number of conductors to form a collective conductor. In this case, an arbitrary number of conductors is determined from the range of the number of conductors within an electrical angle of 180 °, and the conductors are short-circuited for each arbitrary number of conductors. The torque characteristic at this time approaches the torque characteristic of a general-purpose induction motor if the number of arbitrary conductors increases, and conversely, if the number of arbitrary conductors decreases, the multiple stator configuration without the resistance material between the rotor cores described above is used. Will approach the torque characteristics of. In other words, if the number of arbitrary conductors is increased, the influence on the torque characteristic due to the change in the phase difference between the rotating magnetic fields of the two stators is reduced. Changes are less. Conversely, if the number of arbitrary conductors decreases,
The change in the phase difference between the rotating magnetic fields of the two stators has a large effect on the torque characteristic, that is, the change in the phase difference greatly changes the torque characteristic.

Therefore, even if the same phase difference is provided between the rotating magnetic fields of the two stators of a plurality of stator induction motors,
The output torque is diversified depending on the number of arbitrary conductors, and it is possible to create a required torque characteristic by taking the number of conductors. Moreover, various torques can be realized without using a resistance material that was difficult to manufacture as in the past.

Further, in the present invention, the collective conductors serve as a resistance in a pseudo manner. That is, a plurality of conductors provided in communication with the two rotor cores are collectively short-circuited between the rotor cores for each arbitrary number of conductors to form a collective conductor. When the phase difference is not provided between the rotating magnetic fields, this collective conductor acts as a connecting conductor that connects the conductors of the two rotor cores, but when the phase difference is provided, the collective conductor of the rotor is used. Due to the potential difference between the conductors that have been collectively short-circuited at, current flows through the conductors. That is, if the phase difference is large, the potential difference between the conductors of the rotor, which are collectively short-circuited by the collective conductor, is small, and the flowing current is also small. If the phase difference is small, the potential difference between the conductors of the rotor short-circuited by the collective conductor is large, and the flowing current is also large.

In the case of the present invention, an assembly conductor is provided between the rotor cores, and it looks like a short-circuit ring at first glance. However, when this is a short-circuit ring, the phase difference between the rotating magnetic fields of a plurality of stators is increased. There is no change in the torque characteristics even if is changed. However, in the case of the present invention, the torque characteristic is changed depending on the magnitude of the phase difference, and it has a completely different action from the conventional short-circuit ring. Further, an electric motor having a plurality of stators, which does not have a resistance material in which the rotor conductors are not resistance short-circuited between the rotor cores, has a large phase difference. Almost no current flows and therefore no torque is generated, but in the case of the present invention, a practical torque that can be started even with a phase difference of an electrical angle of 180 ° is generated because there is a collective conductor even without providing a resistance material.

From the above, the conventional resistance material, which has previously been disclosed and which resistance-short-circuits the rotor conductors between the rotor cores in the multi-stator configuration, is eliminated, and various conventional resistance materials have been generated. By eliminating manufacturing obstacles, the structure of the rotor is simplified and can be manufactured at low cost.

Further, instead of the conventional resistance material which short-circuits by resistance, a plurality of conductors are collectively short-circuited for each arbitrary number of conductors, and when the resistance material is exhausted in this way, it has been projected up to the outer periphery of the rotor. It is possible to reduce the outer diameter by the amount of the existing resistance material and reduce the axial length by the amount of the resistance material between the rotor cores. This has the great effect of reducing costs.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a multiple stator induction motor according to the present invention will be described with reference to FIG. Reference numeral 1 is a multi-stator induction motor according to the present invention, and the induction motor 1 has a configuration as described below. First, the rotor cores 2 and 3 made of a magnetic material are mounted on the rotor shaft 4 with an arbitrary interval. Is there a non-magnetic core 5 between the rotor cores 2 and 3?
Or space. Further, each of the plurality of conductors 6 mounted on each of the rotor cores 2 and 3 is configured as follows between the rotor cores 2 and 3 in the present invention.
That is, with respect to the plurality of conductors 6 mounted on each of the rotor cores 2 and 3, an arbitrary number of conductors is determined within an electrical angle range of 180 ° or less, and all the conductors 6 are grouped by the set of the arbitrary number of conductors. A plurality of the conductors 9 are provided by collectively short-circuiting. In this way, the plurality of conductors 6 mounted on the rotor cores 2 and 3 are connected to the rotor cores 2 and 3 so as to communicate with each other to form an integral rotor 7, and the plurality of conductors 6 are connected in series. Both ends of each conductor 6 are short-circuited by short-circuit rings 8, 8.

Therefore, the short-circuit ring 8 is formed on one side of the rotor cores 2 and 3 and the collective conductor 9 is formed on the other side by casting the conductors so that the collective conductors 9 of the rotor cores 2 and 3 are butted. The cores 2 and 3 are fitted to the rotor shaft 4, the assembled conductors 9 that are butted against each other are welded by any welding means, and electrical conduction and mechanical strength are secured. This is much simpler than the conventional manufacturing of a rotor with a resistance material, and can be easily realized by butting and welding two rotor cores in which conductors are cast.

The collective conductor 9 provided between the rotor cores
In this case, in this case, four conductors 6 are bundled to form one collective conductor 9, but as described above, the electrical angle 18
The number of conductors may be any within the range of 0 ° or less, and is not limited by this embodiment.

A first stator 12 and a second stator 13, which have windings 10 and 11 on their outer sides facing the rotor cores 2 and 3, are provided side by side and fixed to a machine frame 14. This first stator 1
The second and second stators 13 are provided with windings 10 and 11, respectively. Further, there is provided a phase shifter for providing a phase difference between the rotating magnetic fields produced by the first stator 12 and the second stator 13. The phase shifter may be either a mechanical phase shifter or an electrical phase shifter in the prior art. However, for convenience of explanation, the following description will be made on the assumption that the phase difference by the phase shifter can be changed and adjusted in the range of 0 ° to 180 °.

Further, the rotor 7 will be described. In Figure 2,
The front sectional view of the rotor 7 which used the AA line of FIG. 1 as a cross section is shown. If the number of conductors 6 mounted on the outer periphery of the rotor core 2 is 40 in this example, and if the number of poles of these 40 conductors is 4P, then 10 conductors 6 will be obtained within an electrical angle of 180 °. Will exist. In the case of this embodiment, four conductors 6 out of the 10 conductors are collectively short-circuited as a bundle to provide a collective conductor 9, and the collective conductor 9 is 1 in the entire circumference of the rotor.
0 is provided. Here, the four conductors of the conductor 6 are made into one bundle, but it goes without saying that it is possible to select from two to ten conductors within an electrical angle of 180 ° according to the required torque characteristics. Needless to say, if they are stacked, the number of conductors of the electric motor and the number of conductors within an electrical angle of 180 ° differ depending on the number of poles, and this point is not limited to this embodiment.

FIG. 3 shows an example of torque characteristics of the multiple stator induction motor having the above-mentioned structure. This is an example of a torque characteristic curve when the two stator windings 10 and 11 are connected in parallel and star-connected. Phase difference is 180 °, 120
The torque characteristic changes so as to approach 0 ° with each change of ° and 60 °, and the torque characteristic can be practically used even when the phase difference is 180 °. A conventional multi-stator structure without a resistance material that short-circuits the rotor conductors between the rotor cores at present produces almost no torque at a phase difference of 180 °, but in the present invention, the resistance material is It is possible to generate torque without it. In other words, the four conductors 6 are bundled in the collective conductor 9, but when the phase difference is provided, the four conductors 6 on the rotor core 2 side and the four conductors 6 on the rotor core 3 side one by one. The instantaneous voltage induced on is different. Therefore, due to this difference in voltage, the current flows from the higher voltage side to the lower voltage side, and this common flow path is the collective conductor 9.

If the phase difference is increased, there is no potential difference between the conductors at the relative positions of the four conductors 6 on the rotor core 2 side and the four conductors 6 on the rotor core 3 side, and the conductors 6 at the relative positions are simply present.
No current will flow just by connecting in series. However, in the present invention, since every four conductors are bundled as a collective conductor, a current does not flow between the conductors at the relative positions between the rotor cores 2 and 3, but a potential difference occurs between the adjacent conductors. Even if the phase difference is 180 °, current flows in the rotor conductor and torque is generated. However, the potential difference between adjacent conductors is small, the amount of current flowing is small, and the resistance value seems to increase in a pseudo manner. Further, when the phase difference gradually approaches 0 °, a potential difference also begins to occur between the conductors at the relative positions, and a large amount of current flows from the conductor having a high potential to the conductor having a low potential together with the adjacent conductors. In this way, although the collective conductor is a conductor, it connects an arbitrary number of opposing conductors and then acts so that a current flows due to the potential difference between the conductors caused by the change in phase difference. When the resistance is large and the phase difference is small, it acts as if the resistance was small.

In addition, in the present invention, an example in which four conductors are bundled is shown. However, when the number of conductors is increased to bundle eight conductors into one, the phase difference is 180 °. However, the potential difference between the adjacent conductors bundled by the collective conductor is larger than that in the case of four conductors. That is, the number of conductors is bundled more than in the case of four in the previous example, and the electrical angle in the case of eight conductors is larger than four, so the difference in electromotive force between the conductors due to the phase of the rotating magnetic field becomes large. From this fact, the phase difference is 18 when the eight conductors are bundled rather than when the four conductors are bundled.
The current flowing at 0 ° increases.

As described above, when the phase difference is large, the rotor conductor 6 is provided with a high resistance due to the action of the phase difference and the collective conductor, and at the time of starting, the torque is low but the current is low. ing. Moreover, in combination with the pseudo high resistance at the time of starting and the skin effect due to the slip frequency at the time of starting, a unique torque characteristic that the torque is improved as the slip is larger at the time of starting is created. . Moreover, this tendency becomes more remarkable as the phase difference increases.

Next, the phase shifter which is one constitution of the present invention will be explained with reference to FIG. The following phase shift device will be described by adopting an electrical method in the prior art in which the connection of the stator windings is changed to provide a phase difference.

FIG. 4 shows a wiring diagram of the stator windings of the induction motor 1 of the present invention. First stator 12 and second stator 13
As an example, the wiring configuration of the windings 10 and 11 is a series delta connection that produces an electrical phase difference of 60 °. One terminal of each coil of the stator winding 11 (U ₁ , V ₁ ,
W ₁ ) is connected to the power supplies R, S, T via the power switchgear S ₀ , and the other terminal (X ₁ , Y ₁ , Z ₁ ) is connected to one terminal (Y ₂ , Z ₂ , X ₂ ) in series, and the other terminals (V ₂ , W ₂ ,
U ₂ ) is connected to the power source so as to form a series delta connection with the terminals (U ₁ , V ₁ , W ₁ ). Also, the short-circuit switch S
_One of the terminals ₁ is connected to the other terminal X ₁ of the stator winding 11, and the other is connected to one terminal Z ₂ of the stator winding 10. The short-circuit switch S ₂ is connected to the other terminal Y ₁ of the stator winding 11 and one terminal X ₂ of the stator winding 10. Here, the switches S ₁ and S ₂ shown in FIG. 4 can be used as a phase shifter.

The operation of the above configuration will be described. First, when the power switchgear S ₀ is closed with the short-circuit switches S ₁ and S ₂ open, the stator winding 11 and the stator winding 10 form a series delta connection having an electrical phase difference of 60 °. . Next, when the short-circuit switches S ₁ and S ₂ are closed, a parallel star connection with an electrical phase difference of 0 ° is formed. Further, when only the switch S ₁ or S ₂ is closed, the electrical phase difference 60
Torque characteristics and electrical phase difference 0 ° in series delta connection
The torque characteristic is intermediate to that of the parallel star connection torque characteristic. Therefore, the switches S ₁ and S ₂ are both opened to start, the switch S ₁ (or one of the switches S ₂ ) is closed to accelerate, and finally the remaining switches S ₂ are closed to enter the operating state. is there.

FIG. 5 shows an example of torque characteristics by the serial star connection here. In addition to the electrical phase difference of 60 ° shown in the phase shifter, 180 °, 120 according to FIG.
Clarification of 0 ° and 0 °. In the above-mentioned phase shift device, the switch S ₁ and S ₂ are both open and the power switch S
_{When 0} is closed and started, the electrical phase difference of 60 ° in FIG.
When the start is performed with the torque characteristic of and the switches S ₁ and S ₂ are both closed, the torque characteristic of the electrical phase difference of 0 ° in FIG. 3 is changed.

Now, the changes in torque and current when a general induction motor is started by star-delta start and when the multiple stator induction motor of the present invention is started will be compared. The specifications of the electric motor are as follows: input 45 kw, full load current 1200 A, output torque 60 kgm. In the case of the multiple stator induction motor of the present invention, the electrical phase is switched by the phase shift device as described above. On the other hand, in the case of a general induction motor, it is assumed that decompression start is performed by star-delta switching in order to suppress the starting current. The torque characteristics and current of the multiple stator induction motor of the present invention are shown in FIGS. 3 and 5. The torque characteristics and current of a general induction motor are the load current and output torque when the phase difference is 0 ° shown in FIG. 3 and the load current and output torque when decompressing the star delta start by calculation.

FIG. 6 shows a summary of these output torques and load currents. As is clear from FIG. 6B, in a general induction motor, both the torque and the current become 1/3 when the star delta pressure reduction is started, so the torque is 16 kgm and the current is 340 A.
Will be started in. However, in the case of the present invention, it starts with a torque of 30 kgm and a current of 516A as shown in FIG. 6A. Comparing the two, the torque of the present invention has almost twice the torque. Although the current is as high as 516A, the allowable direct-insertion starting current of the starting class B of the 45kw induction motor is within 546.2A (60Hz) as shown in Fig. 7. With this current value, sufficient direct-insertion starting is possible. It turns out that. That is, according to the induction motor of the present invention,
Although it is an induction motor with a high capacity of about 45 kW, it is possible to perform direct insertion start, and it is clear that the output torque is twice as high as that of the conventional Star Delta decompression start. This has the great advantages of simplifying the equipment that does not require a special starter, reducing the capacity of the electric motor by increasing the starting torque, and reducing the capacity of the power distribution equipment accordingly.

By the way, when the phase difference is 0 °, that is, when the switches S ₁ and S ₂ are closed, the other side of the stator winding 11 (X ₁ , Y ₁ , Z ₁ ) and _one side of the stator winding 10 (X ₂ ,
Y _{2, Z 2)} phases and is short-circuited, electrical accidents, such that even by short-circuit other causes such as contact failure to burn the electric motor does not occur.

Furthermore, the switches S _{1 for} switching the phase,
Since the switching of S ₂ is a short circuit between the operating lines due to the series delta connection, the load current is not temporarily interrupted due to switching, and the voltage between contacts is ½ of the power supply voltage. For this reason, it is possible to use a wire connection opening / closing switch having a small electric capacity, and it is possible to downsize the phase shifter using the switches S ₁ and S ₂ .

By the way, when a phase shifter composed of wire connection opening / closing switches S ₁ and S ₂ is provided on the electric motor side as shown in FIG. 4, only three wires are required from the power source side to the electric motor, which is common to general large electric motors. It is possible to provide an electric motor that can be operated with high torque from low speed to high speed without requiring complicated wiring for starting star delta.

Now, another embodiment regarding the realization of the rotor of this embodiment will be described. In the structure shown in FIGS. 8 and 9, a plurality of hollow conductors 20 which are previously formed of different conductors are provided in a portion serving as a collective conductor, and rotor cores 21 and 22 are arranged so as to sandwich the hollow conductors 20. It is a thing. Further, by forming a plurality of rotor conductors 23 communicating with the rotor cores 21, 22 via the hollow conductors 20 and short-circuit rings 24, 24 on the sides of the rotor cores 21, 22 by casting at the same time, The integral rotor 25 can be easily realized. As a matter of course, the hollow conductor 20 includes a plurality of conductors 23 mounted on the rotor cores 21 and 22 which are collectively short-circuited for each set of an arbitrary number of conductors within an electrical angle of 180 ° or less.
6 is for forming. According to this means, it is possible to manufacture an electric motor that is similar to a general induction motor and is superior to a general induction motor.

[0038]

As described above, since the rotor does not have the resistance material unlike the conventional induction motor having a plurality of stators, the manufacturing can be realized by the same means as the general induction motor, and the manufacturing cost can be reduced. It was able to be greatly reduced. More general induction motors,
In particular, the output torque is significantly larger than the starting torque of Star Delta decompression start used for high-output electric motors, so it is possible to select an electric motor that matches the starting torque from one rank lower than before, so it is possible to reduce capital investment. it can. Similarly, even at full voltage starting, since the starting current is within the allowable current for direct insertion, not only another starter such as a star delta starter is not required, but also the wiring to the motor can be greatly simplified. Therefore, the versatility of multiple stator induction motors that can generate high output with low current from low speed to rated speed range by expanding the variety of torques and expanding to all fields that require high torque motors will be further increased. I can now contribute.

[Brief description of drawings]

FIG. 1 is a side sectional view of a multiple stator induction motor of the present invention.

FIG. 2 is a cross-sectional view of the rotor according to the multiple stator induction motor of the present invention, and is a front cross-sectional view of the rotor taken along the line AA of FIG.

FIG. 3 is a diagram showing an example of torque characteristics of the multiple stator induction motor of the present invention.

FIG. 4 is a diagram showing an example of connection of a stator winding and a phase shift device of a multiple stator induction motor of the present invention.

FIG. 5 is a diagram showing another example of torque characteristics of the multiple stator induction motor of the present invention.

FIG. 6 is a diagram showing an example of output torque and starting current for starting and operating a motor of the present invention and a conventional induction motor.

FIG. 7 is a diagram showing a starting class B of a high capacity induction motor.

FIG. 8 is a diagram showing another embodiment of the rotor according to the present invention.

9 is a front cross-sectional view of the hollow conductor portion of FIG. 8 showing another embodiment of the rotor.

FIG. 10 is a diagram showing an example of a torque characteristic curve of a conventional multiple stator induction motor without a resistance material.

[Explanation of symbols]

 1 Multiple Stator Induction Motor 2 Rotor Core 3 Rotor Core 4 Rotor Shaft 5 Non-Magnetic Core 6 Rotor Conductor 7 Rotor 8 Short Circuit Ring 9 Assembly Conductor 10 Stator Winding 11 Stator Winding 12 First Fixation Child 13 Second stator 14 Machine frame 20 Hollow conductor 21 Rotor core 22 Rotor core 23 Rotor conductor 24 Short-circuit ring 25 Rotor 26 Assembly conductor

Claims (3)

[Claims] 1. A first rotor core and a second rotor core, which are axially mounted on the same rotary shaft with a space or a non-magnetic member interposed therebetween,
And an integral rotor in which a plurality of conductors mounted on the outer peripheral portion of the second rotor core communicate with each other between the first and second rotor cores, and a rotor facing the rotor cores. The first stator and the second stator provided, the rotating magnetic field generated around the first rotor core that the first stator faces, and the second rotation that the second stator faces. A plurality of stator induction motors having a phase shift device for changing a phase difference between a rotating magnetic field generated around a child core and the first stator.
Between the first rotor core and the second rotor core, a plurality of conductors mounted on the outer peripheral portion of the rotor core are collectively short-circuited to form a plurality of conductors for each arbitrary number of conductors within an electrical angle of 180 ° or less. A multi-stator induction motor characterized in that 2. The multi-stator induction motor integrated rotor according to claim 1, wherein all slots are short-circuited to one of the laminated ends of the rotor core in which thin plate cores having a plurality of slots are laminated. The short-circuit ring, a plurality of collective conductors that are collectively short-circuited for each arbitrary number of slots within an electrical angle range of 180 ° or less, and conductors in the plurality of slots are formed by casting to form a rotor portion, and the same. An integral squirrel cage in which two first and second rotor parts formed by casting on the rotary shaft are axially attached so that the respective collective conductors are butted, and the butted collective conductors are electrically conducted. A multi-stator induction motor characterized by being a rotor. 3. An integral rotor for a multi-stator induction motor as set forth in claim 1, wherein first and second rotor cores having laminated thin plate cores having a plurality of slots are arranged at arbitrary intervals. The plurality of slots of the rotor core facing each other at intervals of the rotor core are provided with a plurality of collective conductor members for collectively short-circuiting at any number of slots within an electrical angle range of 180 ° or less. And a second rotor core, and a short-circuit ring that short-circuits all the slots to the outer ends of the first and second rotor cores, and a plurality of short-circuit rings that are collectively short-circuited by the collective conductor member every arbitrary number of slots. 2. A multi-stator induction motor, characterized in that it is an integral squirrel-cage rotor formed by casting the aggregate conductor of 1. and conductors in the plurality of slots.