JPH01243880A - Variable speed induction motor - Google Patents

Abstract

PURPOSE:To protect a resistor material form thermal breakdown, by mounting a conductive coupling member between the resistor material for shortcircuiting a plurality of rotor cores and a conductor placed between the rotor cores. CONSTITUTION:Conductors 5 in rotor cores 2, 3 mounted on a rotor shaft 4 with a predetermined interval are coupled in series and shortcircuited through a resistor material (r) formed into an annular body, thus forming a rotor 8. The resistor material (r) and the conductor 5 are coupled through a conductive coupling member 42 at a non-magnetic core section 9 arranged between the rotor cores 2, 3. On the other hand, stators 24, 25 are juxtaposed on the inner wall face of a machine frame 14 while facing with the rotor cores 2, 3. The stator 25 is rotatable relatively to the fixed stator 24, and the torque of motor is controlled through control of relative phase. By such arrangement, the resistor material can be protected from thermal damage or breakdown.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to variable speed induction motors, more particularly having a single rotor, a plurality of stators and a voltage phase shifter; The present invention relates to a variable speed induction motor with a so-called multi-stator configuration, in which the rotational speed of a rotor and the generated torque can be arbitrarily changed by adjusting a voltage phase shift device.

Prior Art and Its Problems One method of controlling the speed of a centering motor is to change the power supply frequency. Although this method allows for continuous and wide-range speed control, the frequency converter required by this method is expensive, and the process of converting alternating current to direct current and then converting it back to alternating current with the frequency converter generally requires high frequency adjustment. Waves and radio waves are generated, and these can cause problems such as malfunction of computers and their electric controllers, or overheating of capacitors. Among these, harmonic interference can be countered by installing filters. However, installing filters is costly. Additionally, they have drawbacks such as generally insufficient performance at low speeds.

Furthermore, the method of controlling the speed by changing the number of poles of the electric motor has the disadvantage that even if the speed can be changed stepwise by changing the number of poles, it is not possible to control the speed steplessly and smoothly.

Furthermore, although the method of controlling the speed by changing the voltage of the power supply allows continuous speed control, it has the disadvantage of poor efficiency, especially in the low speed range.

The method of controlling the speed by changing the secondary resistance and changing the slip in a wire-wound electric motor allows continuous speed control in the comparative fishing section 1i, but it also allows the rotor to be wound from the outside via brushes and slip rings. Inserting a resistor into the line circuit requires maintenance and inspection due to wear of the brushes, and the squirrel-cage induction lightning motion system has the problem that speed control cannot be performed by changing the secondary resistance.

To address the above problems, for example,
The technology is disclosed in Japanese Patent No. 129005, which includes two sets of rotor cores installed coaxially and two sets of independent stator windings facing the rotor cores. a stator, a squirrel-cage conductor that is commonly installed across the rotor cores and short-circuited at both ends via short-circuit rings, and a central location of the squirrel-cage conductor between the two sets of rotor cores; The twin iron core is equipped with a high-resistance element that shorts the squirrel-cage conductors at each other, shifts the phase of the stator windings by 180 degrees at startup, and supplies power while matching the phases during operation after startup. Although it is a squirrel cage electric motor, when starting, the phases of the stator windings are shifted by 180° to increase the starting torque and improve the starting characteristics, and during operation, the phases of the stator windings are adjusted to match each other. The feature is that it can be operated with normal torque characteristics. Therefore, even if the effect of improving startability is recognized, this electric motor is not a variable speed electric motor and cannot be used as a power source for a load that requires speed change.

In addition, in the above-mentioned Japanese Patent Application Laid-Open No. 54-29005, the power supply circuits of the stator windings are momentarily connected in series for the purpose of mitigating the shock caused by sudden fluctuations in torque when transitioning from startup to operation. An example is to provide an intermediate step, but in this case, the phase shift of the rotating magnetic field is limited to only the points at which the phase shift is 0° and 180°, and is not intended for speed change. Moreover, by switching to series, the voltage applied to the stator is halved, so the torque is reduced to 1/4.
It is clear from the fact that the subject matter disclosed in this publication is not aimed at shifting, that this together with the reduction in speed makes it impossible to control the shift at all.

In short, JP-A No. 54-29005 tentatively states that there is an "intermediate step in which the stator windings are switched between series connection and parallel connection with respect to the power supply circuit," but this series connection is not suitable for the purpose of speed change. It's just a useless connection.

JP-A-49-86807 proposes an asynchronous electric motor having a stator with polyphase windings and a squirrel-cage rotor, including conduction bars, short-circuit end rings, and ferromagnetic laminations. wherein the stator comprises first and second winding sections, the sections being coaxially arranged adjacent to each other and different parts of the rotor;
an asynchronous electric motor which can be supplied with an alternating current of the same frequency and is provided with means for varying the electromotive force induced in the rotor windings by means of a second winding section; Alternatively, although it is possible to change the rotation speed by creating a phase difference between the two stator sections using electrical means, the torque is small unless the phase angle between the two stator sections is in phase. It has a defect that it stops operating immediately when a load is applied, which makes it completely unusable for practical use, and it has a serious problem that it cannot be operated as a power source that repeatedly starts and stops when a load is connected. was left unresolved.

OBJECTS OF THE INVENTION The present invention is intended to improve the drawbacks of the above-mentioned prior art, and is directed to
-86807 Publication seeks a unique torque characteristic that cannot be achieved by the sum of each component, and the speed control range can be widened and the speed control can be set steplessly to any desired speed, and any torque can be set to any desired speed. It is an object of the present invention to provide a variable speed induction motor that can be started at a speed of 100 Hz and has excellent torque characteristics and efficiency over the entire speed range from the starting point to the maximum rotational speed.

The variable speed induction motor of the present invention is used by being connected to a single-phase or three-phase power supply, and the rotor has a normal squirrel cage type, a double squirrel cage type, or a deep groove cage type.

It can be applied to any type of special squirrel-cage rotor with 9 windings, etc., and the conductors used in the explanation of the present invention refer to conductors installed in the squirrel-cage rotor core and conductors wound around the wound rotor core. This is a general term for each of the windings installed.

Means for Solving the Problems In order to achieve the above technical problem, the present invention connects each of a plurality of conductors installed in each of a plurality of rotor cores to form an integral rotor. A plurality of stators are arranged in parallel on the machine frame on an outer peripheral portion facing the plurality of rotor cores which are formed and mounted on the same rotating shaft at arbitrary intervals, and are opposed to the plurality of stators. The plurality of conductors are short-circuited through a resistive material between the plurality of rotor cores that are not connected to each other, and the plurality of fixing elements are connected to at least one stator among the plurality of stators. A phase difference is created between a voltage induced in a conductor portion of the rotor facing one of the stators and a voltage induced in a corresponding conductor portion of the rotor facing the other stator. In the electric motor equipped with a voltage phase shifting device, a conductive connecting member is installed between the resistive material and the conductor between the rotor cores so that the resistive material is provided outside the conductor between the rotor cores, and A means for solving the problem is to surround a part or all of the conductor between the rotor cores or the connecting member with a heat-resistant material.

Furthermore, as a special configuration of the present invention, the rotor conductor is made of a copper material, and the resistance material is made of a copper-nickel alloy.

Furthermore, as a special feature of the present invention, the conductive connecting material is made of copper or a copper-nickel alloy.

Effect of the present invention: When a phase shift is caused in the magnetic flux of the rotating magnetic field generated between the respective stators by an arbitrary means, the combined voltage induced in the rotor conductor changes in accordance with the phase shift of the magnetic flux. , the rotational speed of the rotor can be arbitrarily changed by increasing or decreasing the voltage induced in the rotor conductor.

By the way, when current flows through the resistive material, it naturally generates heat, and the greater the torque obtained, the longer the period of heat generation becomes. As one of the configurations of the present invention, when the rotor conductors are short-circuited and connected between the rotor cores using a resistive material, the resistive material is disposed outside the rotor conductor using a conductive connecting material, so that the length of the resistive material is long. I made it bigger. Therefore, it is now possible to obtain the same resistance value even if the cross-sectional area of the resistance material is increased.
It is now possible to prevent the resistance material from being destroyed due to heat generation.

In the present invention, if you want to widen the shifting range, it is necessary to increase the resistance value of the resistance material, and if you want to obtain a large torque, it is necessary to pass a large current through the resistance material, which causes heat generation in the resistance material. There was a constant risk of destruction.

Furthermore, in the configuration of the present invention, since a part or all of the rotor conductor or the connecting material is surrounded by a heat-resistant material, the conductor or the connecting material becomes extremely high temperature under the influence of heat generation of the resistive material, and the surface of the conductor or the connecting material becomes extremely high. However, this problem was resolved by the action of the heat-resistant material. Note that "surrounding" also includes so-called coating.

In addition, as a special configuration of the present invention, the rotor conductor is made of a copper material and the resistance material is made of a copper-nickel alloy, which makes it possible to reduce the resistance of the copper material, thereby increasing the maximum rotation speed and improving efficiency. In addition, by using a copper-nickel alloy as the resistance material, changes in resistance value due to heat generation could be reduced, and speed control could be stabilized.

Furthermore, when the connecting material is made of copper or a copper-nickel alloy, when the rotor conductor is made of copper material or the resistance material is made of a copper-nickel alloy, it has excellent weldability and enables long-term operation with high torque. It is.

Example Embodiments of the present invention will be described based on FIGS. 1 to 10.

An embodiment of the present invention will be described with reference to FIGS. 1 to 5. (
(See FIGS. 1 and 3) Reference numeral 1 denotes an induction lightning 1jIJ machine, and the induction motor 1 is constructed as follows. Rotor cores 2 and 3 made of iron cores are mounted on a rotor shaft 4 with an arbitrary spacing between them, and a non-magnetic core 9 is interposed between the rotor cores 2 and 3. A plurality of conductors 5 installed in the rotor core 2.3 are connected in series to form an integrated rotor 8.
A plurality of conductors 5 are connected in series, and both ends of the conductors 5 are connected to short-circuit rings 6 and 7. In addition, a plurality of ventilation Fgi cylinders 12 .
A plurality of ventilation holes 13 are perforated orthogonally through the outer periphery of the rotor 8. (See Figures 1 and 2) Bearing discs 15 and 16 provided on both sides of the cylindrical machine frame 14
are integrally assembled by fastening nuts 18 to connecting rods 17, cooling impellers 19 and 20 are attached to both sides of the rotor 8, and both ends of the rotor shaft 4 are attached to bearing discs. The rotor 4 is rotatably supported by bearings 21 and 21 fitted in the bearings 15-16.

A first stator 24 and a second stator 25, each having a winding 22.23 on the outer side facing the rotor core 2.3, are arranged side by side on the machine frame 14, and the machine frame 14 and the first stator 24. A sliding bearing 26.27 is installed between the second stator 25 and the sliding bearing 26.27.
27 is fixed by a stop ring 28 fitted to the machine frame 14, and gears 33A and 33B are fitted to the outer peripheral surfaces of one side of the first stator 24 and the second stator 25. (Second
(See Figure 3) A driving gear 36 is pivotally attached to a pulse motor 35 fixed to the outer periphery of the i-frame 14, and the relay shaft 29 is rotatable on a bearing stand 32 attached to the outer side of the machine frame 14. The relay gear 30 and the rotation gear 31 are mounted on both ends of the relay shaft 29, and the drive gear 36 and the rotation gear 31 are inserted through the openings 37 and 37 provided in the machine frame 14. It is inserted into the machine frame 14, the rotating gear 31 is engaged with the gear 33B fitted on the second stator 25, and the driving gear 36 is connected to the first stator 24.
The relay gear 3 is engaged with the gear 33A fitted on the drive gear 36, and the interlocking gear 34 is integrally formed with the drive gear 36.
0, the first stator 24 and the second stator 25 are configured to be rotatable concentrically with the rotor 8, and the voltage phase is shifted by the first stator 24 and the second stator 25. The device 38 is formed as a variable speed induction motor. 39 is an exhaust hole, and 40 is a plurality of ventilation holes bored in the bearing plate 15, 16.

Next, the connection of the windings 22 and 23 wound around the first stator 24 and the second stator 25 will be explained. (See Figure 4) 1. Star-connected windings 22, 23 are connected in series to each of the second stators 24, 25. That is, the terminals A, B, and C of the winding 22 of the first stator 24 are
Connected to phase power supplies A, B, and C, and terminal a of winding 22
, b, c are the terminals A, B, C of the winding 23 of the second stator 25.
and terminal a of the winding 23.

b and c are connected by short-circuiting them.

(See FIG. 5) In the non-magnetic core 9 portion interposed between the rotor cores 2 and 3 forming the rotor 8, a plurality of conductors 5
A resistive material r such as a copper nickel alloy, nichrome wire, carbon-containing steel 1, and conductive ceramic is provided as a connecting material to short-circuit each of the first... Second stator 24.2
The annular body 41 is formed into an annular body 41 that protrudes outward from the windings 22, 23 wound around the conductor 5, and the annular body 41 and the plurality of conductors 5...
are connected by a conductive connecting material (copper) 42..., and each of the plurality of conductors 5... is short-circuited by a resistance material r of the annular body 41.... Note that the conductive connecting material 42 may be made of a copper-nickel alloy. However, it is not limited to copper or copper-nickel alloy.

The operation of the above configuration will be explained below.

When the windings 22 of the first stator 24 are energized from a commercial three-phase power supply, a rotating magnetic field is generated in the stator 24.25, voltage is induced in the rotor 8, and current is generated in the conductors 5 of the rotor 8. The flow causes the rotor 8 to rotate.

When the rotational borrow of each second stator 25 with respect to the first stator 24 is set to zero, each stator 24.25
There is no phase shift in the magnetic flux of the rotating magnetic field generated in the motor, and as will be explained in detail later, no current flows through the resistive material r..., which is not a connecting material, so it has the same torque characteristics as a general induction motor. It is.

Next, a case will be described in which the pulse motor 35 is operated to rotate the first stator 24 and the second stator 25 in opposite directions by a phase angle of θ. Voltage phase shifter 3
The magnetic flux φ1.8 of the rotating magnetic field created by the first stator 24 and the second stator 25. The phase of φ2 is shifted by θ, and therefore the phase of the voltages 61, 62 induced in the conductors 5 of the rotor 8 by the first stator 24 and the second stator 25 is shifted by θ. Now, using the voltage d2 induced by the second stator 25 in the conductor 5 of the rotor 8 as a reference, let this voltage be 62=SE. Here, S is slip and E is the induced voltage when slip is 1. At this time, the first stator 2
The voltage d1 caused by conductor 5A GCX by 4 is Q+
=SEεJQ.

(E = induced voltage when slip is 1) What is shown in Fig. 6 is the case where the resistive material r... that short-circuits the plurality of conductors 5... is not installed in the non-magnetic core 9 section. This shows the relationship between the slip S of the rotor 8 and the active power P of the rotor input.When the voltage phase is θ=0'', the active power P is maximum, and O'''<θ<180'''
When , it becomes smaller than that. Here conductor 5・
If the resistance and inductance of ... are R and L, and the angular frequency of the power source is ω, then the maximum active power P is S=
Appears when (R/ωL).

Since the active power P is proportional to the driving torque of the induction motor 1, the rotor 8 is rotated by operating the pulse motor 35 to rotate the first stator 24 and the second stator 25 of the voltage phase shifter 38. By adjusting the voltage induced in the rotor, the speed of the rotor can be controlled steplessly.

Next, let R1 and R2 be the respective resistances from the short-circuit ring 6.7hS to the connecting member of the conductor 5 of the rotor 8, let the inductance be Ll and L2, let the angular frequency of the power source be ω, and let each conductor 5 If the resistance of the resistive material that short-circuits each of ... is r, the electrical equivalent circuit of the rotor 8 is as shown in Fig. 7, and the symbols I+ and 12.13 indicate the current flowing through each branch. It is something.

Next, when converting the circuit shown in Fig. 7 into an equivalent circuit seen from both stators 24 and 25 side, it becomes as shown in Fig. 8, and R+=R
z, when LI=L2 and θ= o', 13=II-I
2=0, and no current flows through the resistor material r. This means that when θ=0°, the torque T is equal to the value without r. Therefore, θ=0°
When , it will have the same torque characteristics as a conventional induction motor.

Next, when RI=R2, Ll=L2 and θ=180°, I+=-12, 13=I+-12=2■1,
In a conventional induction motor, the resistance of the rotor conductor is RI=R
If 2=R, the result is the same as if R were increased to R+2r.

As the rotor 8 rotates, outside air is sucked into the machine frame 14 by the cooling impellers 19 and 20 through the communication ports 40 bored in the bearing discs 15 and 16, and the cooling impellers 19 and 20 1st. The second stator 24゜25, the windings 22, 23 are ventilated to cool them, and the ventilation holes 13 are
The rotor cores 2 and 3 and the conductor 5 are
. . . The resistive material r, etc. are cooled to stably perform their respective functions. Also, 1st. The second stator 24.25 is rotated by rotating the pulse motor 35 in forward and reverse directions using a switch, but by providing a large difference in rotation between the first stator 24 and the second stator 250, the re-stator 24. 25 If the phase shift of each voltage is increased and the rotation speed is controlled to be low, the ventilation cooling effect will be attenuated due to the decrease in the rotational speed of the cooling impeller 19°20, and the heat generation of the connecting member r will increase. , resistance material
are also provided on the outer side of the windings 22, 23, and the circumferential speed is high even at low speed rotation, so that heat can be dissipated by ventilation due to the rotation of the resistance material r itself. 1st. Second
The rotating structure of the stator 24° and 25 is not limited to the pulse motor 35, but can be any other forward/reverse motor, or any drive device such as a servo mechanism using a gas or liquid cylinder, etc. Further, there are cases where the operation is performed using a manual handle, and there are cases where only one of the first stator 24 and the second stator 25 is rotated. The rotation of the stator is then released or locked by an arbitrary actuation mechanism in conjunction with the operation of the stator rotation drive device.

Next, the effect of connecting the windings 22 and 23 wound around the first stator 24 and the second stator 25 in series will be explained.

Since the windings 22 and 23 are connected in series, the windings 22 and 23 are connected in series.
A current is input from a commercial three-phase power source and flows between the windings 22 and 23, but if there is a difference in the resistance of each of the windings 22 and 23 or a difference in the capacitance of the stator 24 and 25. Also, independently of that, each winding 22.23
The magnitude of the current flowing through the conductor 5 of the rotor 8 is equal, therefore, from each of the first stator 24 and the second stator 25 to the conductor 5 of the rotor 8
The magnitude of the current induced in... becomes equal, and the vector difference current caused by the phase difference in the voltage between the re-stators 24 and 25 connects each of the plurality of conductors 5... Due to the synergistic effect of the forced force that inevitably flows through the material and the resistance material r, it is possible to improve efficiency and generate large torque in the low speed rotation region, as shown in the slip and torque characteristics shown in Figure 9. Even when a load is connected, it is easy to start in each speed range, and it can be used as desired, such as smooth starting according to the starting characteristics of the load, or starting with high torque. Optimal support for power sources that frequently start and stop. To change the speed of the rotor 8, the voltage phase shifter 38 controls the phase shift to increase or decrease the current flowing through the conductors 5 of the rotor 8, thereby arbitrarily changing the rotational speed of the rotor 8. Can be done.

In addition, the first stator 2 in which windings 1122.23 are connected in series
4 and the second stator 25, respectively, of the rotor 8.
For the magnitude of the current flowing in..., multiple conductors 5...
・The ratio of the current flowing through a short circuit through the resistive material r is:
Pθ (P=
The number of pole pairs, θ = phase angle) is determined by the value of (the above ratio is maximum when Pθ = π and becomes zero when Pθ = 0).If Pθ is constant, the general winding induction voltage! The slip and torque characteristics are the same as when the secondary insertion resistance of the l1 machine is constant, and as Pθ becomes smaller, the ratio of current flowing through the conductor 5 of the rotor 8 becomes smaller, and Pθ can be reduced. This has the same effect as reducing the secondary insertion resistance of a general wound induction motor. and re-stator 24.25
Even if the phase difference θ is arbitrarily changed, depending on the selection of the slip value and the design of the resistance value of the resistor material, the maximum speed, rated current and torque characteristics can be maintained even in each speed range. It can be made to work almost equally. Also, 1st. Winding 22.2 of second stator 24.25
3 are connected in series, if a connecting material is provided between the conductors 5 and there is no short circuit, almost no voltage will be induced from one stator to the rotor conductor 5. This results in a phenomenon in which the efficiency and torque are lower than when the windings 22 and 23 of the stator 24 and 25 are connected in parallel to the power supply.

Note that when the windings 22.23 wound around both stators 24.25 are connected in parallel to the power supply, the windings 22.2
A current transformer is connected to both or one of the stators 24.
If the currents flowing through the transistors 25 are the same, the same effect as that of the series connection described above can be obtained.

What is shown in FIG. 10 is an embodiment in which the rotating shaft 4 is a hollow shaft, and a plurality of ventilation holes 45 are provided between the rotor core 263 and penetrating the inner peripheral part 43 and the outer peripheral part 44.
Outside air can be introduced from both ends of the rotating shaft 4 to ventilate the resistance material r, which is effective for cooling the resistance material r.

In addition, when one side of the rotating shaft 4 is closed and a blower is connected to the opposite side to cool the resistance material r through the ventilation holes 45... 40 may be connected to an air pipe communicating with a blower to cool the resistive material r and the windings 22, 23, or an air cooler may be interposed in the blower.

Furthermore, a phase switching switch can be connected to either of the windings 22 or 23 as a voltage phase device, or a phase switching device can be formed using a single-phase transformer and a connection switching switch, or an induced voltage regulator can be connected. be able to.

In the embodiment of the present invention, the rotor conductor between the rotor cores or the conductive connecting material is made of reramic, stainless steel, resin, rubber, or glass.

Surrounded by asbestos, heat-resistant paint, etc. All parts of the conductor between the rotor cores or the conductive coupling material may be surrounded, or a portion close to the resistive material may be surrounded. As an embodiment of the present invention, there is also an example in which the magnetic core is surrounded by a magnetic core as described above.

By configuring as described above, the conductor and the conductive connecting material between the rotor cores can be prevented from being worn out due to oxidation, and the durability can be greatly improved. Note that the resistive material itself may also be surrounded as described above.

Furthermore, the multiple stator induction motor of the present application can also be used as an induction generator, and the rotor shaft 4 has a turbine and a gas turbine.

If a solar thermal power generator or the like is directly connected to generate electricity, an expensive governor can be omitted. In addition, when an internal combustion engine is connected as a prime mover, it can correspond to the engine speed that achieves the minimum fuel consumption of the internal combustion engine, and even when the power generated from feng shui as an energy source is weak and unstable, the rotation speed that can produce its maximum output. In hydroelectric power generation, power can be generated efficiently according to the flow velocity, and complicated and expensive variable pitch devices or phase adjusters can be omitted. Furthermore, synchronization with external power can be performed without an expensive synchronization device. Furthermore, if a switch is provided that connects another rotating shaft to the rotor shaft and switches the two phases on the input side of the stator winding, and the rotor shaft can be freely rotated in the forward and reverse directions by the switch, the switch By operating with a voltage phase shifter, it can also be used as an electric brake, and by controlling the rotational speed with the voltage phase shifter, the braking force of the rotating shaft connected to the rotor shaft can be efficiently adjusted.

The present invention can also be applied to an induction motor for the purpose of improving startability, which operates with a phase difference of 180 degrees or a large amount at the time of starting, and with a phase difference of Oo or a small amount during operation at the time of starting.

In the configuration of the embodiment of the present invention, if the rotor conductor and the resistive material disposed outside the rotor conductor are connected by the conductive connecting material, the length of the resistive material in the connection between the conductors is directly connected between the conductors. It becomes larger than when connecting by resistance material. This means that when obtaining the same resistance value, the cross-sectional area of the resistive material can be increased, and if we consider the case where the same heat generation (2) is obtained, the heat capacity t of the resistive material becomes large.

Therefore, it is now possible to prevent damage and destruction of the resistive material due to heat generation.

Note that the conductive connecting material may be formed of, for example, a copper material or a copper-nickel alloy. For example, if it is made of a copper-nickel alloy, it has a high resistance value, so it is advantageous that the cross-sectional area of the resistive material or the conductive connecting material can be further increased. In addition, the weldability of copper and copper-nickel alloy is immersive, so there is little chance of breakage even when operated at high torque for long periods of time. Furthermore, the use of a copper-nickel alloy as a resistive material greatly improves the performance of the variable speed induction motor of the present invention, in which the change in resistance value due to heat generation is small and the torque characteristics are greatly affected by the action of the resistive material.

Effects of the Invention In the present invention configured as described above, a large torque can be produced by the action of the resistance material, making it possible to create an excellent variable speed induction motor. During operation, the resistance material may be destroyed or the conductor between the rotor cores may be worn out due to oxidation, but we solve all of these problems and provide a variable speed induction motor that is capable of high torque and stable operation for long periods of time. can do.

[Brief explanation of the drawing]

1 to 10 are illustrations of embodiments of the present application. Figure 1 is a side sectional view of the induction motor, Figure 2 is a side view showing the stator rotation mechanism, Figure 3 is a partially cutaway side view showing the stator rotation mechanism, and Figure 4 is a side view showing the stator rotation mechanism. Figure 5 is a wiring diagram in which the windings wound around the stator are connected in series, Figure 5 is a partial sectional view in which a plurality of conductors are short-circuited by connecting members protruding outward from the windings, and Figure 6 is Figure 7 shows the relationship between rotor slip and active power. Figure 7 is an electrical equivalent circuit diagram of the rotor. Figure 8 is an electrical equivalent III circuit diagram seen from the stator side. Figure 9 is an electrical equivalent circuit diagram of the rotor. A diagram showing the relationship between speed and torque when the windings wound around the stator are connected in series, each short-circuited by a resistive material, and FIG. 10 is a perspective view of a rotor shaft with ventilation holes. 1... Induction motor 1 2.3... Rotor core 4
...Rotor shaft 5...Conductor 6.7...Short-circuit ring 8,8A-8C...Rotor 9...Non-magnetic core 10.11...Side part 12...Ventilation 11i
13...Vent hole 14...Shaft
15, 16... Bearing plate 17... Connecting rod
18... Nut 1'9.20... Cooling impeller 2
1... Bearing 22.23... Winding 24... First stator 25... Second stator 26.27...
Sliding shaft 28...stop ring 29...relay shaft 30...relay gear 31...rotation gear 32
...Bearing stand 33A, 33B...Gear 3
4... Bolt 35... Pulse motor 3
6... Drive gear 37... Opening 38...
Voltage phase shift device 39...Exhaust hole 40...Ventilation hole
41... Annular body 42... Conductive connecting material
43...Inner peripheral part 44...Outer peripheral part 45...
・Vent hole r...resistance material

Claims (3)

[Claims] (1) A plurality of conductors installed in each of a plurality of rotor cores are connected in a continuous manner to form an integral rotor, and the rotor is attached to the same rotating shaft at arbitrary intervals. A plurality of stators are arranged in parallel on the machine frame on the outer periphery facing the plurality of rotor cores, and between the plurality of rotor cores that do not face the plurality of stators, A conductor portion of the rotor that short-circuits the conductor via a resistive material and that faces one of the plurality of stators in relation to at least one stator among the plurality of stators. In a motor equipped with a voltage phase shift device that creates a phase difference between a voltage induced in a conductor portion of the rotor and a voltage induced in a corresponding conductor portion of the rotor facing the other fixation, the resistive material is attached to the rotor core. A conductive connecting material is installed between the conductor between the resistive material and the rotor core so as to be provided on the outside of the conductor between the rotor cores, and a part or all of the conductor between the rotor cores or the connecting material is heat-resistant. A variable speed induction motor characterized by being surrounded by a material. (2), the conductor is made of copper material,
The variable speed induction motor according to claim 1, wherein the resistance material is made of a copper-nickel alloy. (3) The variable speed induction motor according to claim (2), wherein the conductive connecting member is made of a copper material or a copper-nickel alloy.