JPH0834713B2 - Variable speed induction motor - Google Patents

Description

Detailed Description of the Invention [Industrial applications]

The present invention relates to a variable speed induction motor that has good torque characteristics and efficiency and is easy in speed control.

[Prior art and its problems]

One of the methods for controlling the speed of the induction motor is to change the power supply frequency. While this method allows continuous and wide-range speed control, the frequency converter required by this method is expensive, and it is generally used in the process of converting alternating current into direct current and then alternating current by the frequency converting device. Harmonics and radio waves are generated, which may lead to malfunctions of computers and other electric control devices, or failures such as overheating of capacitors. Among them, measures against harmonic interference can be taken by installing a filter, but installation of the filter is costly. The method of changing the power supply frequency also has drawbacks such as generally insufficient performance at low speed. There is also a method of controlling the speed by switching the number of poles of the motor during operation, but in this method, the speed can be changed stepwise by converting the number of poles, but smooth speed control is performed steplessly. There is a drawback that cannot be done. The method of controlling the speed by changing the voltage of the power source has a drawback that the speed is continuously controlled, but the efficiency is deteriorated particularly in a low speed region. There is a method of controlling the speed by changing the secondary resistance and changing the slip in the wire wound motor. While this method allows continuous speed control relatively easily, it requires maintenance due to wear of the brush, because resistance is externally inserted into the rotor winding circuit via the brush and slip ring. To do. The squirrel-cage induction motor cannot control the speed by changing the secondary resistance. Techniques for dealing with the above problems include, for example, Japanese Patent Laid-Open No.
-29005 gazette. This is a squirrel cage conductor that is commonly installed across two sets of rotor cores, and has short-circuiting rings at both ends, which are short-circuited to each other.
A pair of rotor cores, a high-resistance element that short-circuits the cage conductors at the center of the cage conductors, and a stator winding that faces each rotor core and has independent windings.
At start-up, shift the phase between the stator windings by 180 °,
This is a twin-screw cage squirrel-cage motor, which is characterized in that power is supplied with matching phases during operation after starting. This motor improves the starting characteristics by increasing the starting torque by shifting the phases of the stator windings by 180 ° at the time of starting, and adjusts the phases of the stator windings during operation to improve the normal torque characteristics. It is characterized by the fact that it can be operated at. Therefore,
Although the electric motor has an effect of improving the starting characteristic, it cannot be used as a power source of a load that needs gear shifting because the purpose of the electric motor is not to provide a variable speed electric motor. In the above-mentioned Japanese Patent Laid-Open No. 54-29005, for the purpose of alleviating the shock due to the abrupt change of the torque accompanying the transition from the start to the steady operation, temporarily connecting both stator windings to the power supply circuit. It is described as an example to provide an intermediate step for connecting in series, but what can be done in this way is that the shift of the phase of the rotating magnetic field can be limited to 0 ° and 180 ° and the shift control can be performed. Absent.
In addition, it is disclosed in this publication that shifting to series connection makes the voltage applied to each stator halved, and thus the torque can be reduced to 1/4, and the shift control cannot be performed at all. It is also clear that the gist is not for shifting. In short, in the description in JP-A-54-29005, "Intermediate step of switching the stator winding between the series connection and the parallel connection with respect to the power feeding circuit", this series connection is intended for speed change. Not. Further, the technique proposed in JP-A-49-86807 is an asynchronous electric motor having a squirrel-cage rotor and a stator having a multi-phase winding, which includes a conductive bar, a short circuit end ring and a strong magnetic laminated layer. Consisting of a first and a second winding section, the sections being coaxially arranged next to each other and to different parts of the rotor and supplied with alternating current of the same frequency. A non-synchronous electric motor, characterized in that it is provided with means for varying the electromotive force induced in the rotor winding by the second winding section, which is a mechanical or electrical By means of 2
Although it is possible to change the rotation speed by providing a phase difference between the stator sections, the torque is small except when the phase angle between the two stator sections is the same,
It has a defect that the operation stops immediately when a load is applied, which is completely unusable for practical use, and when the load is connected,
It has not solved a serious problem that it cannot be operated as a power source for frequently repeating start / stop.

[Object of the invention]

The present invention is intended to improve the above-mentioned drawbacks of the prior art, and is disclosed in the above-mentioned JP-A-54-29005 and JP-A-49-86807.
The peculiar torque characteristics that cannot be achieved by the sum of the techniques disclosed in the publication are obtained, and the speed control range can be set to a wide range and the speed control can be set to any desired speed steplessly, and at any torque. An excellent variable speed that can be started and has excellent torque characteristics and efficiency that appear by applying a rated current that is almost the same as at the time of maximum rotation speed over the entire speed range from the starting point to the maximum rotation speed. It is to provide an induction motor.

[Means for solving problems]

In order to achieve the above technical object, the present invention has two rotor cores axially attached to the same rotary shaft with a space or a non-magnetic core portion interposed therebetween, and communicates with the two rotor cores. A squirrel-cage rotor in which two sets of a first conductor group and a second conductor group are concentrically arranged at positions having different radii of the rotor core circumference, and are integrally formed. A stator in which two stator cores are arranged in parallel with each other on the outer peripheral portion of each rotor core, and stator windings wound around the respective stator cores are connected in series; A space between the rotor cores or a non-magnetic core portion, and a connecting member for resistance short-circuiting a plurality of conductors of the first conductor group provided on the outermost circumference of the rotor core to each other;
A phase difference occurs between a rotating magnetic field generated around a rotor facing a specific stator of the stators and a rotating magnetic field generated around the rotor facing another stator. A variable-speed induction motor having a voltage phase shifter is provided as means for solving the above problems.

[Work]

According to the present invention, when a phase shift is generated in the magnetic flux of the rotating magnetic field generated in each stator by an arbitrary means, the voltage induced in the rotor conductor changes in accordance with the phase shift of the magnetic flux, that is, The rotation speed of the rotor is arbitrarily changed by increasing / decreasing the voltage induced in the rotor conductor. By the way, the structure in which the respective windings wound around the two stators are connected in series and the rotor core of the two sets of conductors installed at the positions where the radii of the rotor core circumferences differ With the configuration in which a plurality of conductors of the first conductor group provided on the outer circumference are short-circuited to each other via a connecting member, the following effects are produced. That is, the first conductor group via the connecting member has an action of exerting a forcing force that the magnitudes of the currents flowing through the rotor conductors become equal based on the voltage induced in the rotor conductor portions corresponding to the respective stators, An action that creates a forcing force that the vector difference current flowing in the rotor conductor due to the phase difference between the rotating magnetic fields of the stator inevitably flows through the connecting material that short-circuits the rotor conductors. Is born. On the other hand, a current flows through the conductor without the connecting material in inverse proportion to the phase difference between the rotating magnetic fields of the stator. That is, when the phase difference is 180 °, theoretically no current flows in the rotor conductor. Due to these synergistic effects, by changing the phase difference θ, the ratio of the current flowing in the rotor conductor through the connecting material to the current flowing in the connecting material, regardless of slip, and the rotor conductor not passing through the connecting material It is possible to control the flowing current. As a result, by operating the phase difference θ, the action of the connecting member for connecting the rotor conductors of the first conductor group having the connecting members among the two sets of rotor conductors to each other is arbitrarily large. Therefore, the torque characteristic changes depending on the phase difference θ and the peculiar torque characteristic is exerted by the action of the connecting material, and the current of the rotor conductor of the second conductor group without the connecting material is changed by the phase difference θ. By exhibiting an inversely proportional torque characteristic, the torque characteristic of the electric motor is obtained by comparing the torque characteristic of the rotor conductor of the first conductor group with the connecting member with the torque characteristic of the rotor conductor of the second conductor group without the connecting member. The electric motor can have a combined torque characteristic. Therefore, a large torque can be stably obtained not only at the time of start-up but also over the entire range from low speed rotation to high speed rotation, thereby improving efficiency.

【Example】

 An embodiment of the present invention will be described with reference to FIGS. An embodiment of the present invention will be described with reference to FIGS.
In FIGS. 1 and 3, reference numeral 1 is a guide according to the present invention.
The induction motor 1 is an electric motor and has the following configuration.
I do. Set the rotor cores 2 and 3 made of magnetic material at an arbitrary interval.
Installed on the rotor shaft 4 and non-magnetic between the rotor cores 2 and 3.
The body core 9 is provided. Plural pieces mounted on rotor cores 2 and 3
Of the first conductor group 5A ...
Plural pieces mounted at a radius smaller than the first conductor group 5A
Conductor 5 is composed of one set of second conductor group 5B ...
However, each of the first conductor group 5A and the second conductor group 5B is
A) An integral rotor 8 is formed by communicating with a
A plurality of conductors of the first conductor group 5A ... And the second conductor group 5B ...
Both ends of the body 5 are short-circuited by the short-circuit rings 6 and 7. Also,
Both sides of the rotor 8 are attached to the rotor cores 2 and 3 and the non-magnetic core 9.
Multiple ventilation fans 12 are provided to connect to the parts 10 and 11, and the ventilation cylinder 1
A plurality of ventilation holes 13 are provided from 2 ... toward the outer peripheral portion of the rotor 8.
Are provided (see FIG. 2). Installed on rotor 8
The first conductor group 5A ... is a non-magnetic core between the rotor cores 2 and 3.
In the 9th part, each of the plurality of conductors 5 ...
Immediately through the connecting material that conducts electricity when the current of
Made of nichrome wire, carbon mixed steel, conductive ceramic, etc.
Are short-circuited via the resistance material r ... 1 and 2
As you can see, on both sides of the cylindrical machine frame 14,
The bearing discs 15, 16 tighten the nuts 18… on the connecting rods 17…
It is assembled integrally by. Cooling on both sides of rotor 8
Install the impellers 19 and 20, and attach the rotor shaft 4 to both ends of the bearing disc 15,
The rotor 4 is freely rotatable by being supported by bearings 21 and 21 fitted in 16
There is. First stator 24 and second stator 2 with rotor windings 22 and 23
5 refers to the machine frame 14 on the outer side facing the rotor cores 2 and 3.
It is installed side by side. Between the machine frame 14 and the first stator 24 and the second stator 25
Slide bearings 26 and 27 are installed between the slide bearings 26 and 27
It is fixed by Stop ring 28 which is fitted to 14. First
As is clear from FIG. 2 and FIG. 3, the first stator
Keys 33A and 33B are fitted to the outer peripheral surface of 24 and the second stator 25 on one side.
Has been done. A pulse motor 35 is mounted on the outer periphery of the machine frame 14.
A first drive tooth that is provided and integrally formed on the drive shaft
The car 36 and the relay gear 34 are fixed to each other. On the outside of the machine frame 14,
Further, a relay shaft 29 having a relay gear 30 and a second drive gear 31
A bearing stand 32 rotatably supported is mounted. First drive tooth
The wheel 36 and the second drive gear 31 are the openings 3 provided in the machine frame 14.
It faces the machine frame 14 from 7,37 and is fitted to the first stator 24.
Gear 33A and gear 33B fitted to the second stator 25
Mesh with each other. By configuring in this way,
The first stator 24 and the second stator 25 are made of a pulse motor 35.
The movement causes the rotor 8 to rotate concentrically. First stator 24
And the second stator 25 are rotated to cause a voltage phase shift device.
38 are composed. 39 is a drainage hole that is drilled on the outer periphery of the machine frame 14.
Ventilation holes, 40 are ventilation holes formed in the bearing plates 15 and 16 in plurality.
It Next, referring to FIG. 4, the first stator 24 and the second stator 25
Connect the windings 22 and 23 wound around each to the three-phase power supply.
And explain. Winding with star connection on the second stator 25
Reference numeral 23 is each winding 22 in which star connection is similarly applied to the first stator 24.
After being connected in series with each other, they are connected to a power source. Immediately
Then, the terminals A, B, C of the winding wire 22 of the first stator 24 are connected to a commercial three-phase power source.
Connect the terminals a, b and c of the winding 22 to the second fixing while connecting to A, B and C
Connected to terminals A, B, C of winding 23 of child 25, and terminals a, b, c of winding 23
Are short-circuited and connected. The operation of the above configuration will be described below. Power is supplied to the winding 22 of the first stator 24 from a commercial three-phase power supply
Then, a rotating magnetic field is generated in the stators 24 and 25, and this rotating magnetic field is generated.
, The electric current flows through the conductors 5 of the rotor 8 ...
Rotates. Rotation of the second stator 25 with respect to the first stator 24
When the amount is set to zero, each stator 24,25
There is no phase shift in the rotating magnetic field, which will be described in detail later.
As described above, the resistance material r ... which is the connecting material provided in the first conductor group 5A ...
Has the same torque characteristics as general induction motors because no current flows.
Is to have. Next, the pulse motor 35 is operated to operate the first stator 24 and the first stator 24.
Rotate each of the two stators 25 in the opposite direction to generate the phase difference.
First conductor group 5A when rotated so that the angle becomes θ
Will be described. First stator 24 with voltage phase shifter 38
And the magnetic flux φ of the rotating magnetic field created by the second stator 25₁, φ₂The phase of
The electrical angle deviates by θ, so that
Electricity induced in the conductors 5 of the rotor 8 by the second stator 25.
Pressure₁,₂The phase of is also shifted by θ. Now the second
Voltage induced on the conductors 5 of the rotor 8 by the stator 25
₂Based on the₂= SE Where S
Is the slip and E is the induced voltage at slip 1. This and
Voltage induced in the conductor 5 by the first stator 24
₁Is₁= SEε^jθBecomes What is shown in FIG. 5 is a conductor in the nonmagnetic core 9 part.
The second conductor to which the resistance material r ... that short-circuits 5 ... Is not mounted
Group 5B ... of the slip S and torque T of the rotor 8 when alone
It shows a relationship. Torque when the phase difference is θ = 0 °
Is the maximum, and is smaller than 0 ° <θ <180 °
It will be a little thing. Here, the resistance of conductor 5 ...
If the chest is R and L and the angular velocity of the power source is ω,
The maximum value of torque appears when S = (R / ωL). Next, the resistance material r ... which short-circuits the conductor 5 of the rotor 8 is attached.
The case of the first conductor group 5A ... First
Each of the short circuit rings 6 and 7 of the conductor group 5A ...
Resistance to R₁, R₂, And the inductance is L₁, L₂, Around the power supply
Resistance material that short-circuits each of the first conductor group 5A ...
, The electrical equivalent circuit of the rotor 8 is
It becomes like the figure. Code I₁, I₂, I₃Is the current flowing through each branch
Show. The equivalent circuit shown in Fig. 6 seen from both stators 24, 25 side, etc.
When converted into a valence circuit, it becomes as shown in FIG. R₁= R₂, L₁= L
₂And I when the electrical angle is θ = 0 °₃= I₁−I₂= 0
No current flows through the resistance material r. This means that
= 0 ° the torque T is equal to the value without r
It means that. Therefore, when θ = 0 °,
It will have the same torque characteristics as the induction motor. Then R₁= R₂, L₁= L₂When θ = 180 °, I₁=-
I₂, I₃= I₁−I₂= 2I₁And the resistance of the rotor conductor is R₁= R₂
= R, the total resistance of the rotor conductor has increased to R + 2r.
The result is similar. Next, the first stator 24 and the second stator 25 are wound around each.
The operation of connecting the windings 22 and 23 in series will be described. Since windings 22 and 23 are connected in series,
If power is supplied from the three-phase power source for
Differences in resistance or large capacities of both stators 24 and 25
Even if there are differences in size, regardless of each,
The magnitude of the current flowing through the windings 22 and 23 is equal. Accordingly
In the case of the first conductor group 5A ... Via the connecting member, the first stator
The magnetic fluxes of the rotating magnetic fields of 24 and the second stator 25
Of the electric current induced in the first conductor group 5A ... Of the rotor 8
The absolute values are equal. This action and the voltage phase shifter 38
Rotational difference between the first stator 24 and the second stator 25, that is, both fixings 24, 25
The vector difference current based on the phase difference of the rotating magnetic field between
Resistance material r ... which uses each of several conductors 5 as a connecting material
Phase with the action that creates a force that inevitably flows through
Due to the riding effect, the slip and torque characteristics shown in FIG.
To improve efficiency, and in each shift range
A large driving torque can be produced. Therefore negative
Even when the load is connected for each speed range
By arbitrarily adding the resistance of the connecting material to the secondary side,
Easy start-up, adapt to the start-up characteristics of the load and slide
Kana start or high output start
Can be used properly. Frequently repeating start / stop
Can be optimally adapted to the power source. As mentioned above, the rotor 8
For shifting, the phase shift is controlled by the voltage phase shifter 38,
It can be done arbitrarily. The first stator 24 and the first stator 24, in which the windings 22 and 23 are connected in series,
From each of the two stators 25 to the first conductor group 5A of the rotor 8
Provided between the first dynamic group 5A ... for the magnitude of the flowing current
The ratio of the current flowing through the resistance material r ...
The phase difference (electricity)
Angle) is determined by the value of θ. (The above ratio is maximum at θ = π and zero at θ = 0.
It ) If θ is constant, the
The slip and torque characteristics are the same as when the secondary insertion resistance is constant.
Becomes smaller and θ becomes smaller, it flows into the resistance material r that forms the connecting material.
The ratio of the
The same as reducing the secondary insertion resistance of a wound-rotor induction motor.
And so on. And fixed to both stators 24 and 25
When a rated current is applied, change the phase difference θ arbitrarily.
Depends on the selection of the slip value and the design of the resistance value of the connecting material.
The rated current and rated torque characteristics at maximum speed
It is possible to operate them almost simultaneously in each shift range.
it can. In contrast to the above, the windings 22, 2 of the first stator 24 and the second stator 25
When each of the 3 is connected in parallel to a commercial 3-phase power supply
Input to the windings 22 and 23 of the first stator 24 and the second stator 25.
Voltage is equal, and the rotor from each of the two stators 24 and 25
The voltage induced in the conductors 5 of 8 is the same and the phase of the voltage is
Only θ is different and between the first conductors 5A of the plurality of conductors 5 ...
The current that flows through the resistance material r ...
2) × (rotor conductor from each of the first and second stators 24 and 25)
Voltage difference induced by) / (resistance value of resistance material r ...)
The current is as shown. However, the first conductor of the rotor 8
In addition to the current flowing through the resistance material r ...
Sum voltage induced in rotor conductor of determinator ÷ (rotor conductor
Current that is almost proportional to impedance
It The above sum voltage is maximum when θ = π and when θ = 0.
The impedance of the rotor conductor depends on the resistance of the conductor and the secondary leakage.
It is composed of reactance and depends on slip. Shi
Therefore, the large amount of current flowing through the first conductor group 5A of the rotor 8 ...
The ratio of the current flowing through the resistance material r ...
Even if θ is constant, it depends on slip and resistance. θ
The slip and torque characteristics when the value is constant
Characteristics when the secondary insertion resistance of the induction motor is constant,
What is the characteristic when controlling the primary voltage of a general induction motor?
The mixed characteristics, that is, the characteristics shown in FIG.
Become. This characteristic applies to the windings 22 and 23 of the first and second stators 24 and 25.
The speed control range is narrow compared to the characteristics when connected in series.
It will become. Next, by providing the first conductor group 5A and the second conductor group 5B,
The action will be described. FIG. 5 shows the second conductor group 5B ...
Fig. 8 shows the torque and slip that occur when a high resistance connecting material is used.
Showing torque and slip due to the first conductor group 5A ...
Is. The dot-dash line in the graph is the torque for the same current value.
It shows the relationship between the slip and the slip. In FIG.
Torque at the same current value in the phase angle range of 30 ° to 60 °
Decrease and the phase difference is 0 °
The slippage is larger than that of the machine. Also, in FIG.
The output decreases almost proportionally as the phase difference increases.
It gets worse. Fig. 10 shows the first with two sets of conductors installed.
Short-circuits to the conductor group 5A ... via a connecting material, and to the second conductor group 5B.
Indicates the relationship between torque and slip when no connecting material is used.
Things. According to this, two sets of conductors 5 are
The second that acts on the low slip side under the influence of reactance
Of the conductor group 5B ... and the first conductor group 5A ...
Due to the synergistic effect, the same current as shown by the chain line
Luke is obtained and not only at startup but also from low speed to high speed
It is possible to stably obtain a large torque over the entire range up to
Efficiency is thereby improved. Also two sets of plural
Use the connecting material if the resistance value of the conductor 5 is properly selected.
The torque and slip in the range from low speed to high speed.
Relationship can be improved, and it can be achieved with conventional variable speed induction motors.
Torque characteristics that cannot be obtained are obtained. Cooling of these motors is performed by the following method.
Is done. By the rotation of the rotor 8, the cooling impellers 19, 20
From inside the machine frame 14 through the ventilation openings 40 ...
Suck outside air and directly connect the first and second stators 24 and 25 and windings 22 and 23
Air is cooled, and at the same time, it flows to the ventilation holes 13 through the ventilation cylinder 12.
Rotor cores 2, 3, conductors 5, resistance material r ...
Cools etc. and makes each function operate stably. First
The rotation of the first and second stators 24 and 25 is performed by switching the pulse motor 35.
It is performed by rotating it forward / reversely with a chi.
Not limited to the pulse motor 35, other forward and reverse rotation
Servo by motor, gas cylinder, liquid cylinder, etc.
It can be used for any drive device such as a mechanism.
It can also be operated by a manual handle. What
In the illustrated embodiment, the first stator 24 and the second stator 25
Both can be rotated, but with the first stator 24
In the case where only one of the second stators 25 is rotated,
It Rotation of the stator related to the operation of the rotary drive of the stator
The movement can be released and locked by any known actuating mechanism.
Will be Next, referring to FIG. 11, the first stator 24 and the second stator 25
For the connection of the windings that form multiple types of poles for each
Explain. Double winding 41A, 41B is applied to the first stator 24, and
Double winding 42A, 42B is also applied to the stipulator 25, and that of winding 41A, 42A
Terminals U for 4 and 8 poles respectively₂, V₂, W₂And U_Four, V_Four, W_Four
Is provided, and each of the windings 41B and 42B has 6 poles and 12 poles.
Terminal U₁, V₁, W₁And U₃, V₃, W₃And are provided. First fixed
A switch S is provided between the winding 41A of the child 24 and the winding 42A of the second stator 25.
₁₈Connected in series via the same, winding 4 of both stators 24,25
Switch S between 1B and winding 42B₁₄Connected in series via
It More specifically, the winding 41A of the first stator 24
Terminal U_Four, V_Four, W_FourIs switch S₁Through terminal U of winding 41B
₃, V₃, W₃Is switch S_FiveVia a commercial 3-phase power source
Tied up. And terminal U of winding 41A₂, V₂, W₂Is switch S
₃, S₈Through terminal U of winding 41B₁, V₁, W₁Is switch S₇,
S₁₁Each is connected to a commercial three-phase power supply via. Terminal X of winding 41A of the first stator 24₂, Y₂, Z₂Is switch S₁₈
Through the terminal V of the winding 42A of the second stator 25₂, W₂, U₂Connected to
And the terminal X of the winding 41B of the first stator 24₁, Y₁, Z₁Is a switch
Chi S₁₄Through the terminal V of the winding 42B of the second stator 25₁, W₁, U₁To
Connected. Terminal X of winding 42A of second stator 25₂, Y₂, Z₂Is
Switch S_Four, S₉Through the terminal U of the winding 42A_Four, V_Four, W_FourIs
Itch S₂Connected to a commercial 3-phase power source via
Terminal X of winding 42B of second stator 25₁, Y₁, Z₁Is switch S_Ten, S
₁₂Through the terminal U of the winding 42B₃, V₃, W₃Is switch S₆To
Each of them is connected to a commercial three-phase power source via. Also, terminal U of winding 41A₂, V₂, W₂Is switch S₂₀Through
Terminal U of winding 42A_Four, V_Four, W_FourAnd switch S₁₉To
Winding 41A through Z₂, X₂, Y₂Connect to. Also, of the winding 42A
U₂, V₂, W₂Is switch S₁₇Winding 42A through Z₂, X₂, Y₂Contact
To continue. Similarly, terminal U of winding 41B₁, V₁, W₁Is switch S_Fifteen
Winding 42A through terminal U₃, V₃, W₃Connected to
Touch S₁₆Through Z₁, V₁, W₁Is switch S₁₃Winding through 42
B of Z₁, V₁, W₁Connect to. Applied to the first and second stators 24 and 25
Winding 41A, 41B and windings 42A, 42B wiring and pole number switching
Itch S₁~ S₂₀For other configurations, refer to Figs.
The detailed description is omitted because it is the same as that shown. The operation of the above-described configuration is shown in FIGS. 1 to 3 and FIG.
Will be explained. Winding 42A wound around the first stator 24 and the second stator 25
The number of poles of the mounted winding 42A is 4 poles and 8 poles.
Winding 41B wound around 4 and winding wound around the second stator 25
Line 42B has 6 and 12 poles, so
The synchronization speed in is as shown in the table below. Due to the relationship between the number of poles and the synchronous speed, it is now temporarily set to 60Hz.
The rotation speed required for the rotor shaft 4 is 1100 rpm.
The case will be described. Number of poles selection switch S_Five, S₁₂, S₁₃, S_Fifteen, S
₁₆With the other switches open and commercial
Electric power is supplied from the three-phase power supply to the windings 41B and 42B of the first and second stators 24 and 25.
, The rotor shaft 4 rotates from both stators 24 and 25.
Of the synchronous speed of 6 poles due to the voltage induced in the conductor 5 of the child 8
It will be 1200 rpm. Here 100 rpm. Minutes up to 1100 rpm.
Activate the pulse motor 35 to reduce the rolling speed.
Then, rotate the first and second stators 24 and 25 in different directions.
Control the phase shift between the two stators 24 and 25.
Adjust to desired rotation speed. Next, the rotor shaft 4 is required
The case where the rotation speed is 400 rpm will be described. Pole in this case
Number switch S₇, S_Ten, S₁₄Turn on the other switches
12 pole synchronous speed 600 rp obtained under open condition
Speed control in a small range of 200 rpm. from m. to 400 rpm.
Adjust both stators 24, 25 by rotating the motor 35
It Next, the rotation speed required for the rotor shaft 4 is 800 rpm.
A case will be described. In this case, change the number of poles
S₈, S₉, S₁₈When you turn on and open the other switches,
Since the rotor shaft 4 has an 8-pole synchronous speed of 900 rpm.
Rotate both stators 24 and 25 by the pulse motor 35
Control the phase shift and adjust it to 800 rpm. And when 1600 rpm is required for the rotor shaft 4,
Is the number of pole selector switch S₁, S_Four, S₁₇, S₁₉, S₂₀Throw in other
When the switch is opened, the rotor shaft 4 has a 4-pole synchronous speed of 18
Since it becomes 00, both stators 24,25 by the pulse motor 35
Rotate to control the phase shift to 1600 rpm.
It The control of the rotation speed in the above embodiment is performed by the pole number switching switch.
Chi S₁~ S₂₀By operating the
Immediately perform a large shift to the side immediately and fix both
Adjusting the small amount of rotation of the child 24, 25 to achieve the desired number of rotations
It is the ultimate control. This allows for fast speed
Control can be performed steplessly, and the speed control range can be widened.
In addition to that, work near each sync speed
Because it can be done, it is efficient. This is 4 poles and 8 poles in Figure 12.
Also from the graph showing the relationship between slip and torque at the pole
Understandable. Of course, both the stators 24 and 25 described in the above embodiment
Phase of the action of connecting the windings wound on each of the
Improve efficiency in a wide range of control areas due to the multiplication effect
It is possible to produce a large torque as well as
Frequent start / stop / shift control and wide range of speed
Demonstrates a remarkable effect when used as a power source that requires power control
It The number of poles of the windings wound around both stators 24, 25 is
Select an arbitrary number of poles according to the required speed control area
It can be adopted. Furthermore, for example, four stators are provided
Rotation speed required by applying multiple types of windings to each
Switch for changing the number of poles with synchronous speed close to
Select the current to be energized by the
If you control the phase shift, you can control the rotation speed in a wider range.
Can be. Note that significant speed control is performed by converting the number of poles.
The voltage phase shifter 38 and the two stators 24 and 25 are fast in a small range.
For the purpose of adjusting the degree, the amount of rotation can be small, so both
It is not always necessary to rotate both stators 24, 25.
Either, only one of them may be rotated, or both
Different rotation speeds and rotating in the same direction
It is also possible to control the phase more accurately. Next, referring to FIG. 13,
Other forms of voltage phase shifter by connecting phase change switch
The configuration of the voltage phase shifter of the formula will be described. A single winding 43 on each of the first and second stators 24, 25,
Each 44 has a terminal for converting to two poles
It That is, the windings 43 and 44 of the first and second stators 24 and 25, respectively.
To the terminal U₁, V₁, W₁And U₂, V₂, W₂Is provided.
Terminal U of winding 46₂, V₂, W₂Is the number of pole selector switch S_{twenty one}Through
Also, terminal U₁, V₁, W₁Is number switch S_{twenty two}Through it
Each is connected to a commercial three-phase power supply. Terminal U of winding 43₁And Z₁,
Terminal V₁And X₁, Terminal W₁And Y₁Is the phase selector switch S
_{twenty three}Connected via. Winding 43 and winding 44 are connected in series
Connecting path 45, winding 44, and commercial three-phase power supply connecting path
A plurality of phase switching devices that form a voltage phase shifting device 47 are connected to the path 46.
It is set up. That is, the phase change switch S_{twenty three}Circuit of winding 43 connected to
The winding 44 terminal U₂, V₂, W₂To phase switch S_{twenty five}Through
Terminal 44 of winding 44₁And Z₁To terminal V₁And X₁The terminal
W₁And Y₁Each of the phase selector switch S_{twenty four}Connected via
The circuit of each terminal is the phase change switch S_{twenty five}Through
Connect to a commercial 3-phase power supply. By doing this,
The winding 43 and the winding 44 are connected in series and in the same phase.
Become. Further, a connecting step for connecting the winding 43 and the winding 44 in series
Path 45, connecting path of each terminal of winding 44 and commercial three-phase power supply
46 has a phase selector switch S₂₆~ S₃₉Each without interposition
Have been. Connect each switch to each terminal of winding 44.
The details of the conclusion shall be given in conjunction with the explanation of the operation described later.
It In this embodiment, the first and second stators 24 and 25 are rotated.
Both sides are firmly fixed to the machine frame 14.
And pole change switch S_{twenty one}, S_{twenty two}And phase change switch S
_{twenty three}~ S₃₉1 and 2 show only the point where is provided.
Unlike the ones, the other configurations are the same, so
Detailed description thereof will be omitted. Phase change switch S_{twenty three}~ S₃₉
The voltage phase shifter 47 is configured by the above. The operation of the above embodiment will be described below with reference to FIGS.
12 will be described together. First, when operating at maximum speed, switch the number of poles
Itch S₁₃And phase change switch S_Fifteen, S₁₆, S₁₇, S_{twenty five}That of
Turn on each and open the other switches. do this
By this, the windings 43 and 44 are connected in phase and in series.
And the torque characteristics are the same as those of general induction motors.
It Next, the pole change switch S_{twenty one}Is left as is
, The phase selector switch S_{twenty three}, S_{twenty four}, S₂₇, S₃₅Throw in
The other switches to open the phase selector switch S_{twenty three}
To the terminals of the winding 43 and the phase switching switch of the winding 44.
Chi S_{twenty four}The circuit of each terminal connected to the phase selector switch S₃₅
Current through the terminal U of winding 44₂, V₂, W₂From
Phase change switch S₂₇Through the three-phase commercial power supply.
For the phase of the voltage input to winding 43, input it to winding 44.
The phase of the voltage is 60 ° out of phase.
The rotation speed of the rotor 8 decreases according to 60 °. Next, the pole change switch S_{twenty one}With the power turned on
, The phase selector switch S_{twenty three}, S_{twenty four}, S₂₈, S₃₂Throw in
The phase of the voltage input to winding 43
The applied voltage will be 120 ° out of phase,
Rotation speed of rotor 8 is lower than when it is 60 °
It becomes a rotation. To rotate at a lower speed than this state
Is the number of pole selector switch S_{twenty one}, And are left on, and the phase
Changeover switch S_{twenty three}, S_{twenty four}, S₃₀, S₃₁Turn on the other switch
You can open all of the
The phase of the voltage input to the winding and the phase of the voltage input to the winding 44 are
Rotate at the lowest speed with 180 ° deviation and the same number of poles
Can be. In this case, the torque decreases, so the windings 43, 4
Switch to a different number of poles than the number of poles given to 4
It is efficient to control the rotation speed from. Below that
The operation will be described. First, the pole number selector switch S on the winding 43 side_{twenty two}And phase switching
Switch S₂₉, S₃₄When you turn on and open the other switches,
The winding 43 and the winding 44 are connected to the phase change switch provided in the connecting path 45.
Itch S₂₆Current through the
Chi S₂₉To the commercial three-phase power supply via the
Since the phases of the voltage input to this are in phase, this number of poles
It will be the maximum rotation speed. Next, switch for number of poles
S_{twenty two}With the switch on, the phase selector switch S
₃₈, S₃₅Turn on and open the other switches.
Terminal X₁, Y₁, Z₁Is terminal Y of winding 44₁, Z₁, X₁Energize that
The current is at terminal U of winding 44₁, V₁, W₁To phase switch S
₃₈Through the three-phase commercial power supply. Each of the windings 43, 44
The phase of the voltage input to this is 60 ° out of phase,
The rotation speed is larger than that at the time corresponding to this phase shift.
descend. Next, the pole change switch S_{twenty two}Leave as is
Phase change switch S₃₉, S₃₆Switch on and open other switches
Then, the phases of the windings 43 and 44 are shifted by 120 °,
The rotation speed becomes even lower than when the deviation is 60 °. further
To obtain the minimum rotation speed, switch P_{twenty two}Throw in
Leave the phase switch S₃₀, S₃₇Throw in other
It is enough to open the switch, and by doing this, winding 4
The phase of the voltage input to each of 3,44 is 180 ° out of phase,
It can have a low rotational speed. As described above, the phase switching switch formed with the voltage phase shifting device 47.
Chi S_{twenty three}~ S₃₉And number of poles selection switch S_{twenty one}, S_{twenty two}And are operated appropriately
This allows for multiple stators with a single number of windings
The phase of the input voltage can be controlled, making it efficient
Rotational speed control can be performed. This voltage phase shifter 47 is composed of a phase change switch.
The feature of the embodiment is that the rotation speed can be controlled steplessly.
Not possible, but the rotation speed can be changed quickly by switching the number of poles and the phase.
The point is that you can control. In addition, in this embodiment
Rotate both or one of the first and second stators 24 and 25
With this configuration, the phase can be supplementarily controlled, so that
It is possible to shift gears hierarchically and control it quickly.
Can be. In addition, a voltage regulator is attached to the voltage phase shifter 47.
Even then, the rotation speed can be arbitrarily changed. Next, referring to FIG. 14, another practical example of the voltage phase shifter is shown.
An example will be described. The terminals A, B, C of the winding wire 22 of the first stator 24 are connected to the commercial three-phase power supply A,
Connect the terminals a, b and c of the winding 22 to the single phase transformer while connecting them to B and C.
Voltage phase shifter composed of 49 and wire connection switch 48
In series with terminals A, B, C of the winding 23 of the second stator 25 via the device 50
connect. To be more specific, the terminals a, b, and c of the winding 22 are
For the primary side of the single-phase transformer 49 and the connection changeover switches S40, S42
The secondary side of the single-phase transformer 49 is connected, and the connection switching switch
It is connected to the switches S41 and S43 as shown. Winding of the second stator 25
Terminals A, B, and C of line 23 are the connection selector switches S40 to S43, respectively.
It is connected as shown. The operation of this embodiment will be described below. Winding 22
Connect terminals A, B, and C to a commercial three-phase power supply and disconnect the wire.
Turn on only the electromagnetic switch S40 of the exchange switch 48 and
Open the switch, the phase of the respective voltage of windings 22 and 23
Are in phase, and the rotation speed of the rotor shaft 4 is equal to the maximum rotation speed.
Become. Next, turn on only the wire connection changeover switch S41 and
When the switch is opened, it enters the winding 23 through the transformer 49.
The phase of the applied voltage is the phase of the voltage input to the winding 22.
The voltage is advanced by 60 °, which is more than when the voltage is in phase
The rotation speed will be slow. Then, when only the connection changeover switch S42 is turned on, the winding
The phase of the voltage input to line 23 is the level of the voltage input to winding 22.
The voltage is 120 ° ahead of the phase and the phase shift is 60 °
The rotation speed becomes slower than when. Next, change the wiring
When only switch S43 is turned on, the voltage input to winding 23
The phase of is advanced 180 ° with respect to the phase of the voltage input to the winding 23.
The voltage becomes the maximum voltage and the minimum rotation speed. In this example
The torque characteristics are also the same as those shown in FIG. What
The first stator 24 and the second stator can be
The phase shift of the voltage generated between the determinants 25 changes stepwise.
The first and second stators 24 and 25 or both
Control to any rotation speed by rotating one of them
can do. In this case, change the rotation speed significantly.
Shifting at an auxiliary rotational speed is performed by the connection changeover switch.
Since the rotation of the stator is performed,
As a result, quick shift control can be performed. Next, referring to FIG. 15, still another embodiment of the voltage phase shifter will be described.
I will explain. The voltage phase shifter of this embodiment has a frame body.
The fixed stator 51a and its inside are rotatably attached to the shaft.
Rotor 51b, and the primary winding 52 on the stator 51a,
Three-phase induction current composed of the secondary winding 53 on the rotor 51b
The pressure regulator 51. Terminals A, B, C of the winding 22 of the first stator 24 are commercial three-phase power supply A,
It is connected to B and C. Primary winding 52 of three-phase induction voltage regulator 51
Terminals A, B, C of are connected to terminals a, b, c of winding 22 of the first stator 24
And is connected to the terminals a, b, c of the secondary winding 53.
Terminals A, B and C of the secondary winding 53 are terminals of the winding 23 of the second stator 25
Connected to A, B, C. That is, the stator windings 22 and 23 of the motor are
Through the three-phase induction voltage regulator 51 which is a voltage phase shifter in the middle
Are connected in series. In this embodiment, a three-phase induction with a secondary winding 53
By rotating the rotor 51b of the voltage regulator 51 by an arbitrary amount,
Of the voltage input to the windings 22 and 23 of the first and second stators 24 and 25
The phase can be shifted, depending on the required rotation speed
Thus, the rotation speed of the rotor shaft 4 can be controlled. Next, according to FIG. 16, it was wound around the first and second stators 24 and 25.
The method of connecting the windings will be described. Winding around the first stator 24
Terminals U, V and W of the wound winding 22 are switches M₁Also through the end
Child X, Y, Z is switch M₆So that they can be shorted to each other
ing. In addition, terminals U, V, W of winding 22 and terminals Z, X, Y are
Touch M₂It can be connected via. On the other hand, winding
Terminals U, V, W on line 23 are switches M₉Through terminals X, Y, Z
Is switch M₃Is connected to a commercial three-phase power supply via. Winding
23 terminals U, V, W are short-circuit switch M₇Short-circuited due to
I'm supposed to get it. In addition, terminals U, V, W of winding 23
What is X, Y, Z? Switch M_FourTo be able to connect to each other via
Has become. And terminals R, V, W of winding 22 and terminals of winding 23
Switch M between X, Y and Z₈Also through the terminals of winding 22
Switch M between X, Y, Z and terminals U, V, W of winding 23_TenThrough
The windings 22 and 23 can be connected directly
It can be connected to a row. The operation of the above configuration is shown in FIGS. 1 and 16 below.
It will be explained based on. Switch the windings 22 and 23 of the first and second stators 24 and 25
M₁, M₃And M_TenTo open other switches.
Delta connection is made by and the windings 22 and 23 are commercial 3-phase power supply.
When electric power is supplied from the above, a rotating magnetic field is generated in the stators 24 and 25,
An electric current flows through the conductors 5 of the rotor 8 based on this rotating magnetic field.
As a result, the rotor 8 rotates. Rotation amount of the first and second stators 24 and 25
Is zero, winding 2 of each stator 24,25
The voltage input to 2,23 has no phase shift,
It has the same torque characteristics as the electric motor and the rotation speed of the rotor shaft 4.
The degree is the maximum rotation speed. Operates the pulse motor 35 to rotate the first and second stators 24 and 25.
Continuous control of rotation speed by moving
Can be. The phase difference of the voltage between the two stators 24 and 25 becomes 180 °.
When it does, the decrease in rotation speed reaches the limit for the time being. Fixed
Phase angle θ = 0 ° when the secondary windings 22 and 23 are delta connection
From θ to θ = 180 °, the relationship between slip and torque is
As shown in Fig. 17, slip S₁~ S₂In the range of
Can be used by arbitrarily controlling the rotation speed of the rotor shaft 4.
It However, in the above state, the slip S is S =
S₂To S = 1.0, speed control becomes impossible.
That is, speed control in the hatched area in Figure 17 is not possible.
Becomes To deal with the above phenomenon, switch M₆, M₈And M₉Throw
Turn on and open other switches to connect windings 22 and 23
Is switched to star connection. In this state, the first fixed
Magnetic flux φ of the rotating magnetic field created by the child 24 and the second stator 25₁′,
φ₂′ Is in phase. Moreover, the winding of the first and second stators 24 and 25
Since each of the wires 22 and 23 has a star connection, the windings 22 and 23 are
The voltage applied to thebecome. Therefore, magnetic flux φ₁′, Φ₂Rotated by ′
The voltage induced in the conductor 5 of the child 8 is alsoAnd the torque of the rotor 8 is proportional to the square of the voltage,
The torque is 1/3. Therefore, in FIG. 17, if θ = 0 ° S = 1.0
The torque of T₁And θ = 180 ° S = 1.0
Ku to T₂Then, the windings 22 and 23 of the first and second stators 24 and 25 are connected.
By switching the wire to star connection with a switch
As shown in Fig. 18, its torque characteristic is θ = 180 °
When S = 1.0, the torque is T₁/ 3 and θ = 0 °
When S = 1.0, the torque is T₂/ 3, indicated by hatching
The area in which speed control is out of control is considerably small. So T₂=
T₁It is designed to be 3/3, and the winding 2 of the first and second stators 24 and 25
Switch the 2nd and 23rd connections to the delta connection using the switch, and
2 Rotate the stators 24 and 25 to induce them in the conductor 5 of the rotor 8.
Change the phase difference of the voltage from 0 ° to 180 °, and then
Use a switch to switch the connection between the windings 22 and 23 of both stators 24 and 25.
There is no phase difference between the two stators 24 and 25 when switched to the star connection.
Therefore, rotate the first and second stators 24 and 25 in the opposite direction to the above.
If the phase of the voltage is changed from 0 ° to 180 °, it becomes negative.
Wide range of speeds corresponding to large changes in load reaction torque Tr
Can be controlled, even in its low speed control range
It is also possible to secure a large torque. FIG. 19 shows the space between the rotor cores 2 and 3 or
In the 9th part of the non-magnetic core, connect to the rotor cores 2 and 3.
Fitted on the rotor shaft 4 and each of the plurality of mounted conductors 5 ...
Shorter due to the resistance material r that forms a connecting material with the high resistance ring 54 to be inserted.
It is one example which is related. In addition, the resistance material r ...
Works properly even if it is not connected to all conductors 5 ...
Obtainable. Further, a connecting material interposed between the conductors 5 ...
Constant voltage dio connected in series with opposite polarity as a pair
A constant voltage with a resistor material
In some cases, a diode is connected in series to form a connecting material.
Or a resistor material and the set of constant voltage diodes between the conductors
Power factor and torque are improved by connecting them in parallel.
There are cases. The voltage phase shifter is limited to the above embodiment.
Rather, it is a device that causes a phase shift between both stators.
If so, it can be arbitrarily selected and adopted. Also installed on the rotor core
Even if the conductor has low resistance, it is a connecting material between the conductors.
By providing a short circuit, the torque characteristic of the present invention described above is
It is possible to ensure the improvement of efficiency and efficiency. Also on the stator
Several types of windings have been applied so that the number of poles can be changed.
If not, the windings on each of the rotor cores
And connect them to each other in series, and use them as connecting materials during the process.
If a resistance material is installed between the
Be done. The winding wound around the rotor core may be star connection or
Is a delta connection that can be selected and used.
It Next, referring to the block diagram shown in FIG.
An example of automatically controlling a conductive motive will be described. I / O control circuit 56, control circuit 57, arithmetic circuit 58, memory circuit 5
The speed indicator 6 is installed on the input side of the control device 55 composed of 9 etc.
A speed detector 60 such as a tachogenerator with 1 and a magnetic
The stator rotation position detector 62 such as a sensor and the
Temperature detector 63 installed in the place and a key equipped with a display.
Board 64. On the other hand, on the output side of the controller 55
Locks the rotation of the pulse motor 35 and rotation side stator.
Is open electromagnet 65, windings 22, 23, conductor 5, ..., Resistance material r
A blower that blows air that cools etc. from appropriate places on the machine casing 14.
An electric motor 66 for driving the motor is connected. From keyboard 64
The following control values are previously stored in the memory circuit 59 of the controller 55.
It has been entered. That is, the rotation for the phase angle 0 ° to 180 °
The rotation amount of the rotary stator and the pulse mode for the rotation amount of the stator.
The pulse control value of the motor 35 and the phase angle of 0 ° to 180 °
The stator position detector 62 and the cooling inside the machine frame 14.
The starting temperature reference value is input in advance. Rotor shaft
Input the speed control value of 4 into the controller 55 via the keyboard 64.
Force is applied, the speed control value input will be fixed.
The rotation amount of the stator is calculated and corresponds to the rotation amount of the stator.
The pulse control value for the pulse motor 35 is calculated.
It Electromagnet 65 operates based on the output signal from controller 55
The controller 55 and unlock the stator.
The pulse motor 35 operates in response to the signal of
I do. It is sent from the speed detector 60 mounted on the rotor shaft 4.
The detected speed value and the speed control value are compared and the
If there is a difference, control device 55 to pulse motor 35
It is output and the rotation speed is corrected and controlled. On the other hand, the difference between the two
If there is not, it is assumed that the desired rotation speed is controlled.
Then, the rotation of the stator is locked by the electromagnet 65. The temperature detection value of the temperature detector 63, which is sent to the controller 55, is
The temperature becomes higher than the temperature reference value set in the memory circuit 59.
And the signal output from the control device 55
The machine 66 starts, and the air is blown into the machine frame 14 to wind the windings 22, 23 and the conductor 5.
..., cooling of the resistance material r, etc. is started. Smell while driving
Then, input a new rotation speed value from the keyboard 64,
The current position of the stator reported from the stator rotation position detector 62
Actuating the pulse motor 35 for the desired speed value
Pulse control value is calculated and the output signal from the controller 55 is
The electromagnet 65 and pulse motor 35
The rotation speed is controlled. In addition, the number of poles changing switch 68,
Connect the phase change switch 69, etc., and input to the controller 55.
Depending on the speed control value, the automatic control may be performed.
In addition, connect the air cooling device 67 to the blower and install it in the control device 55.
Operate the air cooling device 67 to the specified temperature reference value
In some cases. Furthermore, the variable speed induction motor of the present invention is used as an induction generator.
Can also be used, in which case the rotor shaft 4
Power generation by directly connecting the engine, gas turbine, solar power generator, etc.
If so, an expensive speed governor can be omitted. Also, within
When connecting a combustor as a prime mover to generate electricity,
It is possible to generate power corresponding to the minimum fuel consumption speed of the internal combustion engine.
When the power source using feng shui is weak and unstable,
Even in the case of
Can be In hydropower generation, the effect depends on the flow velocity.
Able to generate electricity efficiently, a complicated and expensive variable pitch device or
The phase modifier can be omitted. High synchronization with external power
It can be done without a costly synchronizer. Also other rotations in the rotor phase
Connect the shafts and replace the two phases on the input side of the stator winding
Switch to rotate the rotor shaft forward,
If it is reversible, the switch and voltage phase shifter can be operated.
Therefore, it can also be used as an electric brake. Voltage
By controlling the rotation speed with a phase shifter, the rotor
The braking force of the rotating shaft connected to the shaft can be adjusted efficiently.

【The invention's effect】

As described above, according to the present invention, windings wound around a plurality of stators are connected in series, and a voltage phase shifter is provided in association with at least one of the stators. Two sets of plural conductors having different resistances are installed between the rotor cores that do not face each other, and the windings of each stator are connected in series, and two sets of plural rotor conductors are connected. The effect of the combination of short-circuiting the rotor conductors at the outermost circumference among the rotors via the connecting material is that the conductors via the connecting material induce a rotor conductor corresponding to each stator. As a result, a compulsory force that the magnitudes of the currents flowing through the individual rotor cores become equal to each other, and a vector difference current due to the phase difference of the rotating magnetic field between the stators Inevitably through a connecting material that short-circuits the rotor conductors On the other hand, due to the synergistic effect of the forced force that occurs, and the effect that current flows in the conductor that does not pass through the connecting material in inverse proportion to the phase difference of the voltage between the stators, It is possible to secure almost the same rated current and rated torque, and to achieve brilliantly the object of improving the torque characteristics and efficiency that cannot be achieved by the sum of the cited publications. Was created. Therefore, of course, it is possible to control the start-up and speed change according to the desired characteristics of the load, as well as to perform a smooth start-up control that adapts to the load. It has a remarkable effect.

[Brief description of drawings]

1 to 20 are diagrams showing an embodiment of the present invention. FIG. 1 is a side sectional view of an induction motor, FIG. 2 is a sectional view showing a rotating mechanism of a stator, and FIG. 3 is a side view showing a partially broken sectional view of a rotating mechanism of a stator. Fig. 4 is a wiring diagram in which the stator windings are connected in series, Fig. 5 is a graph showing the relationship between rotor slip and active power, Fig. 6 is an electrical equivalent circuit of the rotor, and Fig. 7 is Fig. 6 Fig. 8 shows the electrical equivalent circuit of the electric equivalent circuit seen from the stator side. Fig. 8 shows the relationship between the slip and torque when the rotor conductors are short-circuited by a resistance material and the stator windings are connected in series. Fig. 9 is a torque characteristic diagram showing the relationship between slip and torque when the stator windings are connected in parallel to a power source, and Fig. 10 is an arbitrary set of multiple conductors. Torque showing the relationship between slip and torque when the stator windings are short-circuited and the stator windings are connected in series Sex view. Fig. 11 is a wiring diagram when multiple types of windings are applied to the stator and the number of poles is switched by a switch. Fig. 12 is a torque characteristic diagram showing the relationship between slip and torque at 4 poles and 8 poles, and Fig. 13 Is a connection diagram to the stator windings of the phase changeover switch formed by the voltage phase shifter, FIG. 14 is an embodiment diagram in which the voltage phase shifter is composed of a single-phase transformer and a phase changeover switch, and FIG. 15 is a voltage diagram. Fig. 16 shows an embodiment in which the phase shifter is composed of an induction voltage regulator, Fig. 16 is a wiring diagram in which the stator winding is switched to a delta connection or a star connection by a switch, and Figs. 17 and 18 are the relation between slip and torque. Torque characteristic diagram showing
FIG. 19 is a partial cross-sectional view when a resistance material is connected between a plurality of conductors, and FIG. 20 is a block configuration diagram in the case of automatically controlling the induction motor according to the present invention. 1 ... Induction motor, 2,3 ... Rotor core, 4 ... Rotor shaft, 5 ... Conductor, 5A ... First conductor group, 5B ... Second conductor group, 6,7 ... Short-circuit ring , 8 ... Rotor, 9 ... Non-magnetic core, 10,11 ... Side part, 12 ... Ventilation cylinder, 13 ... Ventilation hole, 14
…… Shaft, 15, 16 …… Bearing board, 17 …… Connecting rod, 18 …… Nut, 19, 20 …… Cooling impeller, 21 …… Bearing, 22, 23 …… Winding, 24 …… 1 stator, 25 …… Second stator, 26,27 ……
Sliding shaft, 28 ... Stop ring, 29 ... Relay shaft, 30 ...
… Relay gear, 31 …… Second drive gear, 32 …… Bearing stand,
33A, 33B ...... Gear, 34 ...... Relay gear, 35 ...... Pulse motor, 36 ...... First drive gear, 37 ...... Opening part, 38 ...... Voltage phase shifter, 39 ...... Exhaust hole, 40 ... … Ventilation holes, 41A, 41B…
… Winding, 42A, 42B …… Winding, 45, 46 …… Connection path, 47…
… Voltage phase shifter, 48 …… Connection switch, 49 …… Single-phase transformer, 50 …… Voltage phase shifter, 51 …… Induction voltage regulator,
52 …… Primary winding, 53 …… Secondary winding, 54 …… High resistance ring, 55
...... Control device, 56 ...... Input / output circuit, 57 ...... Control circuit, 58
...... Arithmetic circuit, 59 …… Memory circuit, 60 …… Speed detector, 61
...... Speed indicator, 62 …… Stator rotation position detector, 63 ……
Temperature detector, 64 …… keyboard, 65 …… electromagnet, 66 ……
Electric motor, 67 ... Air cooling device, 68 ... Number of poles changeover switch, 69 ... Phase changeover switch.

Claims (7)

[Claims] 1. A rotor having two rotor cores axially attached to the same rotary shaft with a space or a non-magnetic core interposed therebetween, and a plurality of conductors communicating with the two rotor cores A squirrel-cage rotor integrally formed by concentrically arranging two sets of a first conductor group and a second conductor group at positions having different radii of the core circumference;
Two stator cores are arranged in parallel to each other on the outer peripheral portion of each rotor core, and stator coils wound around the respective stator cores are connected in series, and the two stator cores. In the space between the rotor cores or in the non-magnetic core portion, a connecting member for resistance-shorting the plurality of conductors of the first conductor group provided on the outermost circumference of the rotor core to each other, and two fixing members. A voltage shift that causes a phase difference between a rotating magnetic field generated around a rotor facing a certain stator of the child and a rotating magnetic field generated around the rotor facing another stator. A variable speed induction motor having a phase device. 2. The voltage phase shifter is arranged such that a specific stator is fixed to another fixed phase difference so that the phase difference between the two stators can be set to an arbitrary phase difference within a range of 0 ° to 180 °. The variable speed induction motor according to claim (1), characterized in that it comprises stator rotating means for rotating relative to the child. 3. The voltage phase shifter comprises a stator winding of a specific stator and a phase changeover switch provided between another stator winding and a power source to generate a stepwise phase difference. A variable speed induction motor according to claim (1). 4. The variable speed induction motor according to claim 1, wherein the voltage phase shift device is formed by a single-phase transformer and a connection changeover switch. 5. The variable speed induction motor according to claim 1, wherein the voltage phase shifter is an induction voltage regulator. 6. The method according to claim 1, wherein each of the two stators is provided with a winding for forming a plurality of types of poles, and a pole number changeover switch is connected to a terminal of the winding. The variable speed induction motor as described in any one of (5). 7. The scope of claims (1) to (5), wherein a switch is provided for switching the connection of each winding of the two stators to either delta connection or star connection. The variable speed induction motor according to any one of 1.