JPS62268391A - Induction motor - Google Patents

Abstract

PURPOSE:To improve efficiency in the range of a low speed, by arranging connecting members conducted electrically by the application of arbitrary voltage between rotor cores, on an induction motor having a plurality of stators and changing the phase of the stators to control a speed. CONSTITUTION:Rotor cores 2, 3 made of iron cores are fitted on a rotor shaft 4 by setting an arbitrary space between them, and between the rotor cores 2, 3, a non-magnetic unit core 9 is set. A plurality of conductors 5 arranged on the rotor cores 2, 5 are respectively connected in series, and a rotor 8 is integrally formed, and both the end sections of a plurality of the conductors 5 connected in series are connected to short-circuit rings 6, 7. On the non- magnetic unit core section 9, a plurality of the conductors 5 are respectively short-circuited via the resistance members r of Nichrome wires, carbon-mixed coppers, conductive ceramics, and the like as connecting members conducted electrically by the application of arbitrary voltage.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an induction motor with good torque characteristics and efficiency and easy speed control.

Prior Art and Its Problems One method of controlling the speed of an induction 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 the Combi Coater and its electrical control equipment or overheating of the capacitor. Measures against harmonic interference can be taken by installing a filter. 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.

Further, although the method of controlling the speed by changing the voltage of the power supply allows the speed to be controlled continuously, it has the disadvantage that the efficiency is poor especially in the low speed range.

In a wire-wound electric motor, the method of controlling the speed by changing the secondary resistance and changing the slip is relatively easy to perform continuous sub-control. Inserting a resistor into the winding circuit requires maintenance and inspection due to brush wear, and squirrel cage induction motors have the disadvantage that speed control cannot be performed by changing the secondary resistance.

Furthermore, the stator is divided into two sets, a fixed stator and a movable stator, with roughly the same windings and connected to the same power supply, and the rotor -
The rotor conductors are divided into 52 groups, and the rotor conductors are connected at the center with a wide wing-like conductor, and both ends are connected to short-circuit rings, and the movable stator is rotated, and the secondary A phase current is generated in the same conductor in response to the secondary induced voltage induced in the rotor conductor, so that the current of the sum of the two vectors passes through the rotor conductor as a secondary current, and the speed of the motor can be arbitrarily varied. The variable speed induction motor that was created was published in 1987-4357.
This is known as Publication No. 1, and it generates a different-phase current in the rotor conductor by rotating the movable stator, changes the secondary current, and easily adjusts the speed of the motor as desired. Although it has features such as being able to reduce the current, it generates a large amount of torque in the low rotational speed region where the amount of rotation of the movable stator is increased! There were no shortcomings left unresolved.

OBJECTS OF THE INVENTION It is an object of the present invention to provide an induction motor that can improve the drawbacks of the prior art described above, can continuously control the speed over a wide range of speeds, and has good torque characteristics especially in the low speed range. It is in.

The 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 rotor shape such as a normal squirrel cage type, a double squirrel cage type, a deep groove cage type, a special squirrel cage type with 9 windings, etc. The conductor used in the description of the present invention is a general term for the conductor installed in the squirrel cage rotor core and the winding wound around the wound rotor core. It is something to do.

Means for Solving the Problems In order to achieve the above object, the present invention provides a method in which a plurality of stators each having a winding are arranged in parallel on a machine frame at arbitrary intervals, and the plurality of stators are At least one of the stators is formed to be rotatable concentrically with the rotor shaft, and a plurality of rotor cores are arranged on an inner circumferential surface facing the plurality of stators to rotate the rotor. The plurality of rotors are connected to each other to form an integral rotor, and the plurality of rotors that do not face the stator are connected to each of the plurality of conductors installed on the child shaft and installed on the plurality of rotors. The problem is solved by short-circuiting each of the plurality of conductors in the space of the child core or the non-magnetic core through a connecting member that conducts electricity when a given voltage is applied.

Operation With the above configuration, when the stator, which is rotatable concentrically with the rotor, and the other stator are energized, a rotating magnetic field is generated, a voltage is induced in the rotor, and a voltage is applied to the rotor core. The rotor rotates when current flows through the conductor. When the rotation of the rotation side stator is set to zero and there is no rotation difference between it and the other stator,
There is no difference in the phase of the rotating magnetic field between the stators, and the current flowing through the rotor conductor does not flow through the connecting material, so it exhibits the same torque characteristics as a general induction motor. When the moving side stator is rotated, a phase shift occurs in the rotating magnetic field generated between it and the other stator, and according to the phase shift, it is induced in the rotor conductor of the part facing the rotating side stator. The rotation speed of the rotor changes depending on the voltage and the combined voltage induced in the rotor conductor in the part facing the other stator, and as the combined voltage increases, the slip factor increases and the power factor and torque decrease. do.

However, since each of the plurality of conductors is short-circuited at a position that does not face the stator via a connecting member that conducts electricity when a given voltage is applied, there is a phase shift in the rotating magnetic field as the rotating stator rotates. If a shift occurs and a phase shift occurs between the voltage induced in the rotor conductor in the part facing the rotating stator and the voltage induced in the rotor conductor in the part facing the other stator, the coupling member When a voltage is applied to the conductor, a short circuit occurs between the plurality of conductors through the connecting member, and a current flows, thereby improving the power factor and ensuring a large torque in the low-speed rotation region.

Example Embodiments of the present invention will be described based on FIGS. 1 to 20.

Reference numeral 1 shown in FIGS. 1 and 2 is an induction motor,
The induction motor 1 is constructed as follows. Rotor cores 2 and 3 made of iron cores are mounted on a rotor shaft 4 at an arbitrary interval, and a non-magnetic material 9 is interposed between the rotors 2 and 3.

Each of the plurality of conductors 5 installed in the rotor core 2.3 is connected in series to form an integral I-family rotor 8,
Both ends of the plurality of conductors 5 connected in series are connected to a short circuit ring 6.7. Also rotor core 2.3.9
A plurality of ventilation cylinders 12... are installed on both sides 10, 11 of the rotor 8 to cover the series #8, and a plurality of ventilation cylinders 12... are installed perpendicularly to the outer circumference of the rotor 8 from the ventilation cylinders 12... Ventilation hole 13・
... is installed. As shown in FIG. 3, the rotor 8 has a non-magnetic core 9 between the rotor cores 2 and 3 using nichrome as a connecting material that conducts electricity when an arbitrary voltage is applied to each of the plurality of conductors 5. There are 10 short circuits through wires, carbon-containing steel, 1 resistive material such as conductive ceramic, etc. (
(See Figures 1 and 2) Bearing discs 15 and 16 provided on both sides of the cylindrical machine frame 14 are connected to connecting rods 17 by nuts 18 and 16.
・Bearings 21, 21 are fastened and assembled integrally, cooling impellers 19 and 20 are attached to both sides of the rotor 8, and both ends of the rotor shaft 4 are fitted into bearing discs 15 and 16. The rotor 4 is rotatably supported.

A first stator 24 and a second stator 25 having windings 22 and 23 are disposed on the outer side facing the rotor cores 2 and 3, 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 is fixed by stop rings 28 to 31 fitted to the machine frame 14, and the outer periphery of one side of the second stator 25 is fixed. A movement prevention ring 32 is fitted to the part, and rotation of the second identifier 25 is locked by a bolt 34 screwed into the machine frame 14. A gear 33 is fitted to the outer peripheral surface of one side of the first stator 24, and an A-mgya 36 is pivoted to a pulse motor 35 fixed to the outer peripheral part of the machine frame 14. Karatsui-Mugi V-36
is inserted and engaged with the gear r-33, and the first stator 24 is inserted into the rotor 8 (this IJ L r
That's it. Reference numeral 38 indicates a cover provided in the rear part 37, reference numeral 39 indicates an exhaust hole, and reference numeral 40 indicates a plurality of ventilation holes drilled in the bearing plate 15 and 16.

The effect of a3 in the above configuration will be explained below.

1st. 2nd (i!il constantor 24.25 winding 22.23
When energized, a rotating magnetic field is generated in the stator 24, 25, voltage is induced in the rotor 8, current flows through the conductors 5 of the rotor 8, and the rotor 8 rotates.

When the amount of rotation of the first stator 24 with respect to the second stator 25 is set to zero, the winding 2 of each stator 24.25
2.23 The phase of the manually applied rotating magnetic field is out of phase.
As will be described in detail later, since no current flows through the resistor material r, which is not a connecting member, it has the same torque characteristics as a general induction motor.

Next, a case where the first stator 24 is rotated by a phase angle of θ with respect to the second stator 25 will be explained as follows. The magnetic flux φ1 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 ω induced in the conductor 5 of the rotor 8 by the second stator 25 as a reference, the voltage is set to t.
Let a2=SE. Here, S is slip and E is the induced voltage when slip is 1. At this time, the first stator 24
The voltage 61 induced in the conductor 5A by 6l-8E
εjO.

(Induced voltage when E-slip 1) What is shown in Fig. 4 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 slippage 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 when the voltage phase is 0° - 180°, It will be smaller than that. Here conductor 5...
If the resistance and inductance of is R and [, and the angular frequency of the power source is ω, then the maximum of the effective power [] is S=
Appears when (R/ωL).

Since the active power [) is proportional to the driving torque of the induction motor 1, the speed can be continuously controlled by rotating the first stator 24.

Next, let R1 and R2 be the respective resistances from the short-circuit rings 6.7 of the conductors 5 of the rotor 8 to the connecting members, let Ll and L2 be the inductances, let ω be the angular frequency of the power supply, 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. 5, and the symbols I+ and I2.13 indicate the current flowing through each branch. It is something.

Next, if we convert what is shown in Fig. 5 into an η value circuit viewed from both stator 24 and 25 sides, it becomes as shown in Fig. 6, and R+ =
When R2, LI=L2 and θ=0°, 13=I+-1
2=O, and current flows through the resistor material r. This means that when θ=0°, the number 1 torque 1- is equal to the value when r is absent. Therefore θ−
A 0° sharpening has the same torque characteristics as a conventional induction motor.

Next, when R1=R2, LI=L2 and θ-180°, I+=-I2. l3=I+-12=21+, and in the conventional induction motor, the resistance of the rotor conductor is RI=
If R2=R, the result is the same as if R were increased to R+2r.

From the above results, the torque characteristics range from S=1.0 to S-
In the range of O, as shown in FIG. 7, the first stator 24
If you change the phase angle by rotating , the torque will change.

Now, if the reaction torque of the load connected to the rotor shaft 4 of the induction motor 1 is Tr shown in FIG.
By changing the rotation angle θ of the rotor 8, the slip of the rotor 8 can be reduced by 8
1 to 82, that is, the rotational speed of the rotor 8 can be changed. Further, by changing the set value of the resistance r depending on the speed control region, the speed range of the rotor 8 can be further expanded, and a large torque can be generated during low speed rotation.

Due to the rotation of the rotor 8, the bearing 1! ! Outside air is sucked into the machine frame 14 by cooling impellers 19, 20 through ventilation holes 40 bored in holes 15, 16, and the stators 24, 25, windings 22, . The rotor cores 2, 3, conductors 5..., resistance material r..., etc. are cooled by the air flowing through the ventilation holes 13... through the ventilation barrel 12... to ensure that each function operates stably.

Further, the first stator 24 is rotated by rotating the pulse motor 35 in forward and reverse directions using a switch.
5, and may be operated using a manual handle.

Next, referring to FIG. 8, another embodiment of a rotor in which diodes are used as connecting members for short-circuiting each of a plurality of conductors will be explained. A plurality of conductors 5 installed in the rotor core 2.3
Each of the conductors 5... are connected in series to form an integral rotor (7 plurality of conductors 5... are tied together, and both ends of the plurality of conductors 5... are connected to a short-circuit ring to form an integral rotor). 8A and the first
．． Rotor core 2. which does not face the second stator 2°4,25.
A plurality of conductors 5...
A pair of constant voltage diodes D are connected in series with opposite polarity and operate at an arbitrary voltage value. The electrical equivalent circuit is as shown in FIG. 9, and the phase angle θ of the voltage operated by the first stator 24 is
is 1806, and when R+=Rz and L+=L2, 1
1-112, and when a set of constant voltage diodes D, which serve as connecting members that short-circuit each of the plurality of conductors, are in a energized state, a current of l3-I+-T2-2I+ flows, so θ It can produce a large amount of torque even at 180°.

Fig. 10 shows the torque characteristics of this example. The curve shown by the solid line is the torque characteristic when the connecting material to be short-circuited is a pair of diodes D... This is the torque characteristic in the low speed region when each of the conductors 5 . . . is not short-circuited. As can be seen from this torque curve, when the phase angle of the voltage is θ-0°, there is no current in the pair of medium voltage diodes D, which are used as connecting members to short-circuit each of the plurality of conductors 5. Does not flow, -
It exhibits the same torque specification as the installed motor, and in the low-speed rotation range at each phase difference, both torque characteristics and efficiency are significantly improved.

1t> shown in FIG. 11 is another embodiment of a rotor in which a navy blue diode of opposite polarity is connected in series with a resistive material as a connecting material to short-circuit each of a plurality of conductors. .

Each of the plurality of conductors 5 installed in the rotor core 2.3 is connected in series to form an integral plurality of conductors 5...
The both ends of the plurality of conductors 5... are connected to the short circuit ring to form an integral rotor 8B. Second stator 2
4.25, the non-magnetic core 9 between the rotor cores 2 and 3 that do not face each other serves as a connecting member that connects and short-circuits each of the plurality of conductors 5, and when an arbitrary voltage is applied, the energization 1 - Resistance material R such as nichrome wire, ferrous roam wire, carbon mixed steel etc. and a set of constant voltage diodes D connected in series with opposite polarity which also conducts electricity when an arbitrary voltage is applied.
・And are connected in series.

The electrical equivalent circuit in this embodiment is as shown in FIG. is applied and the voltage value becomes larger than the voltage value set for the diode D..., the plurality of conductors 5...
A current is short-circuited and flows through each of the resistive materials r... and the set of voltage regulator diodes D..., and the first
As shown in the torque curve shown in Figure 3, a resistive material r... which short-circuits each of the plurality of conductors 5... during low speed rotation.
Torque values T1 to T4 at each phase difference are shown by dotted lines when a set of diodes D... are not provided in series with
On the other hand, when a resistive material r... and a set of voltage regulating diodes D... are provided as connecting members, the torque values T+' to T4' at each phase difference become large, and a large torque can be generated even in the low speed rotation region. secure. In addition, the resistance material r and 1
What is connected in series with the set of constant voltage diodes D may be reversed to that in the embodiment diagram.

Next, FIG. 14 shows still another embodiment of a rotor in which a resistive material and a set of diodes are arranged side by side as connecting members for short-circuiting the respective frames of a plurality of conductors.

1st. A connecting member that connects and short-circuits each of the plurality of conductors 5 installed in communication between the rotors 2, 3 in the non-magnetic core 9 portion that does not face the second stator 24, 25. A resistor r... and a set of constant voltage diodes D... connected in series with opposite polarity are arranged in parallel, and the rotor 8 is integrally oriented.
It is formed into C.

The electrical equivalent circuit in this embodiment is as shown in FIG. 15, and starts from an arbitrary point in time when the phase difference between the voltages induced in the conductors 5 of the rotor 8 gradually increases with the amount of rotation of the first stator 24. A short circuit occurs to the resistive material r..., current flows, and the resistive material r...
・The power factor is improved by the action of The torque curve can be improved as shown in FIG. The torque characteristics in this embodiment are similar to the J embodiment shown in FIG. When a voltage is applied to and energizes the constant voltage diode D..., the characteristics are similar to those of the embodiment shown in FIG. One of these is selected and adopted in consideration of the characteristics in the area that adapts to the speed.

Next, the connections between the wound rotor and its windings will be explained with reference to FIGS. 17 and 18.

Two rotor cores 41 and 42 made of iron core on the rotor shaft 4
are mounted so that the first stator 24 and the second stator 25 face each other, and windings/1.3.44 are applied to the rotor core 41.42 to form a conductor as shown in FIG. Winding 43.44
are connected in series with diodes D... connected in series with opposite polarities to short-circuit the respective windings, and if necessary, the voltage regulator diodes D...
・A resistive material r... may be connected in series.

Winding 43.44. Diode D..., resistance material r...
A cover 46 made of a non-magnetic material is attached to the connecting portion 45 so that the rotor 47 is not swung out due to the centrifugal action accompanying the rotation of the rotor 47. Rotor = 174
1.42, a plurality of ventilation cylinders 48 passing through each end portion.

49... are opened, and a plurality of exhaust holes 50... are bored in the circumferential surface of the cover 46. The configuration other than the above is the same as in FIGS. 1 and 2, and each winding 43.4
The connection material that short-circuits the circuit 45 of No. 4 is connected to a set of constant voltage diodes D... The effect thereof is the same as the embodiment shown in FIG. 8, and the connection material is connected to a resistance material R... Since the effect when a set of constant voltage diodes D, . . . are connected in series is the same as that of the embodiment in FIG.

The fourth embodiment shown in FIG. 19 is an embodiment in which two stators 58 and 59 arranged in parallel in the machine frame 14 of the induction motor 1 are both rotatable. Stator 58.59 with winding 60.61
is fitted into the slide bearing 26°27 so that the stator 58, 59 can freely rotate concentrically with respect to the rotor 8, and the slide bearing 2
6.degree. 27 are each fixed to the machine frame 14 by stop rings 28-31. The drive gear 62 is pivotally attached to the pulse motor 35 mounted on the machine frame 14, and the drive gear 62 is inserted into the machine frame 14 through an opening provided in the machine frame 14 and fitted onto the outer periphery of one side of the stator 58. This is to engage the gear 33 that has arrived. A relay shaft 64 is rotatably mounted on a bearing stand 63 mounted on the outer side of the machine frame 14, and an interlocking gear is integrally formed with a drive gear 62 on a relay gear 65 rotatably mounted on one side of the relay shaft 64. 66 is engaged with the other side of the relay shaft 64, and the rotating gear 67 is engaged with the gear 30 fitted on the outer periphery of one side of the stator 59, and fixed by the operation of the pulse motor 35. The child 58 and the stator 59 rotate in opposite directions.

The feature of this embodiment is that the stator 58 and the stator 59 are configured to rotate in different directions.
By the forward/reverse action of the pulse motor 35, both stators 5
8.59 It is possible to quickly control the rotational speed to a desired speed by reducing the amount of rotation, and this is particularly effective when it is necessary to repeat speed change control frequently.

In addition, when accurate rotational speed control is required in a small range, gears connected to the pulse motor 35 are appropriately combined to rotate both stators 58 and 59 in the same direction. The stators 58 and 59 may be configured to rotate at a circumferential speed.

In addition, in the description of each of the above embodiments, only the first stator 24 was described as being rotatable, but the second stator 25 may be configured to rotate instead of the second stator 24. However, the number of stators and rotors is not limited to two, but it is also possible to provide a plurality of stators and rotors and attach any number of them to the machine frame. It is possible to freely select whether the stator is fixedly installed or an arbitrary number of stators are rotatably provided depending on the sizing of the electric motor, the purpose, etc. Then, the first stator 24 and the second stator 2
Although the operation has been explained by limiting the capacitance of stators 5 to 5 to be the same, the capacitance of one of the stators may be increased.

In addition, it goes without saying that the windings connected to the stator and rotor can be either star connected or delta connected. The number of voltage diodes is not limited to one set, but may be a plurality of sets. Further, the number of voltage diodes is not limited to constant voltage diodes, and any diode that can achieve the above-described effect can be appropriately selected and used. The capacitance of the resistive material and the constant voltage diode can be varied depending on the torque characteristics required in the speed control region, and the corresponding effect can be obtained even if the connecting material is not necessarily connected to all of the plurality of conductors.

Next, automatic control of the induction motor will be explained with reference to FIGS. 1, 2, and 20.

Induced lightning, first stator 24 and second stator 25 of motive 1
The terminals of the windings 22 and 23 are extended from inside the machine frame 14 and connected to three-phase commercial power sources a, b, and c via a switch 51. A control value setting panel 5) 2 for setting the speed, etc. of the induction motor 1 corresponding to the rotational speed of the load is connected to a control device 53 equipped with a memory circuit and a comparison calculation circuit, and is mounted on the rotor shaft 4 of the motor 1. A speed detector 54 such as a generator, a pulse motor 35 for rotationally controlling the first fixing member 24, a switch 51, and a blower pipe are connected to the ventilation port 40 of the bearing board 16. Electric blower 57 is driven by electric motor 1.
! 155, and a temperature detector 5 that detects the temperature inside the machine frame 14.
6 are connected to a control device 53.

With the above configuration, the speed control value of the electric motor 1 and the pulse control value of the pulse motor 35 for each rotation angle of the first stator 24 are manually input from the control value setting panel 52 to the control device 53. The output signal from the control device 53 is transferred to the switch 51.
In the control device 53 that communicated the speed of the rotor 4 to start the electric motor 1, detected the speed of the rotor 4 with the speed detector 54, and communicated the detected value, the rotation speed of the rotor 80 is different from the input speed control value. In this case, the rotation angle of the first stator 24 is calculated so as to obtain the speed control value, and the number of operating pulses of the pulse motor 35 is calculated, and the calculated value is used as the output signal of the control device 53 to control the pulse motor 35. -35
is operated to rotate the first stator 24 and control it to a desired rotational speed. In some cases, a signal for controlling the rotation speed of the load is automatically input via the control value setting board 52. In this case, the rotation speed control value of the electric motor 1 is used to control the rotation speed of the motor 1.
By operating the pulse motor 35, the motor 1 is automatically controlled to a desired rotation speed without using the motor 4, and the electric motor 1 can be used efficiently by unmanned operation.

Further, the temperature detection value 56 detects that the temperature inside the machine frame 14 has risen above the temperature value set in the control device 53, and the electric motor 55 is started by an output signal that communicates the detected value to the control device 53. Due to the blowing action, the stator, two rotors, conductors,
Cools diodes, resistance materials, etc. Note that an air cooling device may be connected to the blower 57, and the drought detector 56
The blower 54 may be operated regardless of the situation.

Effects of the Invention As explained above, according to the present invention, the speed of the rotor can be adjusted arbitrarily by rotating the stator on the rotary side to change the phase of the rotating magnetic field with respect to the other stator. Speed JI [control 16
During operation, in the space between the rotor 117 that does not face the stator or in the non-magnetic core part, each of the plurality of conductors is short-circuited via a connecting member that conducts electricity when a voltage is applied. ! In the low speed region where the rotation amount of the stator on the 1lljJ side is increased and the phase of the rotating magnetic field is significantly shifted, efficiency can be improved and large torque can be obtained, and the power is used to frequently repeat starting, stopping and speed change control. It has a remarkable effect when used as a source.

[Brief explanation of drawings]

1 to 20 are illustrations of embodiments of the present invention, in which FIG. 1 is a side sectional view of the induction motor of the present invention, FIG. 2 is a side view showing the rotation mechanism of the stator, and FIG. is a partially enlarged view of Figure 1, Figure 4 is a diagram showing the relationship between rotor slip and active power, and Figure 5 is a diagram showing the relationship between rotor slip and active power.
Figure 6 is an electrical equivalent circuit diagram of the rotor, Figure 6 is an electrical equivalent circuit diagram seen from the stator side, and Figure 7 shows the speed and speed when the connecting material used to short-circuit each of the multiple conductors is a resistive material. Figure 8 is a partially enlarged view showing another embodiment of the rotor; Figure 9 is an electrical equivalent circuit diagram; Figure 10 is a diagram showing the relationship between speed and torque characteristics; FIG. 11 is a partially enlarged view showing another embodiment of the rotor, FIG. 12 is an electrical equivalent circuit diagram, FIG. 13 is a diagram showing the relationship between phase angle and torque characteristics, and FIG.
Figure 4 is a partially enlarged view showing another embodiment of the rotor, Figure 15 is an electrical equivalent circuit diagram, Figure 16 is a diagram showing the relationship between phase angle and torque phase angle and torque characteristics, and Figure 17 is the rotor. Fig. 18 is a diagram showing the connection of each winding in Fig. 17, Fig. 19 is an example of controlling the rotation of both stators, and Fig. 20 is an induction motor. FIG. 2 is a block diagram showing automatic control of the FIG.

Claims (6)

[Claims] (1) A plurality of stators each having a winding are arranged in parallel on the machine frame at an arbitrary interval, and at least one of the plurality of stators is rotated concentrically with the rotor shaft. a plurality of rotor cores arranged on an inner circumferential surface facing the plurality of stators and mounted on the rotor shaft; and a plurality of rotor cores mounted on the plurality of rotor cores, respectively. Each of the plurality of conductors is connected to form an integral rotor, and each of the plurality of conductors is connected in a space between the plurality of rotor cores or in a non-magnetic core portion that does not face the stator. An induction motor is characterized in that it is short-circuited through a connecting member that becomes energized when a given voltage is applied. (2) Claim No. (2), wherein the connecting material is a resistance material.
The induction motor described in item 1). (3) The induction motor according to claim (1), wherein the connecting member is at least one set of diodes connected in series with opposite polarities. (4) The induction motor according to claim (1), wherein the connecting member is formed by connecting in series at least one set of diodes connected in series with opposite polarities and a resistive material. (5) The induction motor according to claim (1), in which the connecting member is formed by arranging at least one set of diodes connected in series with opposite polarities and a resistive material. (6) The induction motor according to any one of claims (1) to (5), wherein the diode is a constant voltage diode.