JPH01231681A - Variable speed induction motor - Google Patents

Abstract

PURPOSE:To steplessly control a variable speed induction motor so as to be preferable for a drive source for a fan, a pump, etc., by connecting windings wound on a plurality of stators in parallel with a power source. CONSTITUTION:A small-sized motor 35 is operated to rotate a rotary stator 31 with respect to a second stator 25 to regulate a voltage induced in a rotor 8, thereby stepless controlling the speed of the rotor 8. Here, windings 22, 23 wound on the stators 31, 25 are connected in parallel with a power source, and a plurality of conductors 5 are connected by short-circuit through a resistor (r) between a plurality of rotor cores on which the conductors 5 are mounted. Slip and torque characteristics become mixture characteristic of the characteris tic when a secondary resistor is inserted in a general wound rotor type induction motor and that when the primary voltage of a general induction motor is con trolled.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a variable speed induction motor that is applied to loads with reduced torque characteristics, such as fans and pumps, which have good torque characteristics and efficiency and whose speed can be easily controlled.

[Prior art and its problems]

In recent years, one method of generally controlling the speed of a general-purpose electric motor is to change the frequency of the power supply. While this method allows for continuous and wide-range speed control,
The frequency converter required for this method is expensive, and harmonics and radio waves are generally generated in the process of converting alternating current to direct current and then back to alternating current. This can lead to problems such as malfunction of equipment or overheating of condensers. Among these, harmonic interference can be countered by installing filters, but installing filters is costly. In addition, it generally has shortcomings such as insufficient performance and <Q6 in slow-speed poetry.

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

In addition, the rotor of a general-purpose electric motor is formed by overlapping and connecting multiple silicon steel plates whose end surfaces have been treated with a phosphoric acid insulating coating such as carlite. Even if the conductor insertion hole to be inserted is not insulated, the current flowing back into the conductor will not flow into the conductor insertion hole, so there is no need to take any special measures.

By the way, as an example of a conventional multiple stator electric motor, the one disclosed in Japanese Patent Application Laid-Open No. 54-19005 is known, and in this technology, two sets of rotor cores installed on the same axis are opposed to each other. A squirrel-cage type stator, which is installed in common across two sets of stators each having an independent stator winding, and the two sets of rotor cores, and which are short-circuited at both ends via short-circuit rings. A conductor and a high-resistance element that shorts between the squirrel-cage conductors at the center of the squirrel-cage conductors between two sets of rotor cores, each independently fixed facing the rotor core. This is a twin-core squirrel-cage mower that has windings in the stator windings, shifts the phase of the stator windings by 180 degrees during startup, and supplies power while matching the phases during operation after startup. 180° phase between stator windings
By shifting the stator windings, the starting torque is increased and the starting characteristics are improved, and during operation, the phases of the stator windings are matched with each other so that the stator windings 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.

To describe the technology disclosed in Japanese Patent Application Laid-Open No. 54-29005 in more detail, when transitioning from startup to operation,
For the purpose of alleviating the shock caused by sudden fluctuations in torque, one example is to provide an intermediate stellate tube that momentarily connects the mutual power supply circuits of the stator windings in series, but in this case,
The phase shift of the rotating magnetic field is limited to only one point at both ends of Oo 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, and this makes gear change control completely impossible, which is the main point disclosed in this publication. It is obvious that the purpose is not to change the speed, and it is said that it is an "intermediate step in which one stator winding is switched between series connection and parallel connection with respect to the power supply circuit."
This series connection is nothing more than a connection that is completely useless for the purpose of speed change, and cannot control the speed change to any desired speed.
Because no insulating material is attached to the conductor insertion hole for inserting the conductor into the rotor core of the set, when the stator windings are shifted out of phase with each other during startup to increase the starting torque, the current flows back into the conductor. Since current leaks from the conductor insertion hole into the rotor core and is absorbed, there is a drawback that the efficiency of starting torque is reduced.

In addition, Japanese Patent Application Laid-open No. 57-59457 discloses a method in which a rotor core is fixed to a single axis and a high resistance starting winding is provided for each rotor. In addition, a low-resistance secondary conductor is provided in the two rotor cores to guide the operating winding, and when starting the motor, the electromagnetic phase input to one stator winding is controlled by switching the electromagnetic switch. Normal operation is started by switching the temperature from 180 degrees to 120 degrees to 0 degrees.During this switching operation, the heat generated in the C1 starting winding is quite large, and there is no electrical connection between the secondary conductors. Since insulation is required for the Since this is a factor in reducing the leakage reactance of the conductor, it was necessary to take considerable care in heat dissipation and insulation of the starting winding. In addition, this device is also not capable of changing the speed in the low speed region arbitrarily, and if the phase of one stator is set to a rotation speed that matches the phase of 150 degrees or 120 degrees by operating the electromagnetic switch, then The heat generation of the starting winding is extremely high, and this heat generation causes a decrease in efficiency and durability due to current loss in the winding and conductor. There was a problem that the -C could not be used as a practical electric motor that could control speed changes.

Furthermore, the variable speed induction motor disclosed in Japanese Patent Publication No. 271357 connects the rotor conductor divided into 20%, and connects the windings each having a fixed stator and a movable stator in parallel to a power source. A configuration in which a rotating device is connected to a rotating stator and an indicator light is installed to display the number of rotations.C
·be. This device is A3 in that it can freely change gears, and is disclosed in the above-mentioned JP-A-54-29005 and JP-A-57-5.
This is different from that in Publication No. 9457.

However, this also does not connect the rotor conductor with a short-circuited resistive material between the two sets of rotors, and cannot generate sufficient functionality by controlling the rotational speed range to low to medium speeds. Particularly in applications such as fans and pumps that require reduced 1 to 1 torque characteristics, the resistance material is not short-circuited, so the variable speed required for such drive sources can be regulated to 1 to 1 torque. J: T-This electric motor simply indicates the rotation speed by increasing or decreasing the indicator light that displays the rotation speed, and is the rotation speed automatically controlled based on the degree of increase or decrease in the indicator light? There was an unavoidable problem.

[Purpose of the invention]

One of the objectives of the present invention is to enable stepless control of increasing and decreasing the drive of fans, pumps, etc., and to improve the torque characteristics of electric motors that are frequently operated and stopped. The aim is to construct an electric motor free from harmonic interference.

Another purpose is to be able to control the rotational speed of the electric motor to any desired speed over the entire speed range from low speed to high speed, and to configure the speed control at a low cost, as well as to improve its operation. The purpose is to install a device that makes it easier.

The other purpose is to install an insulating material on the rotor 1A, the conductor insertion hole, one of the conductors, or both to prevent leakage from the conductor to the rotor core. This prevents the generation of current and effectively increases the current flowing through the resistor material connected by short-circuiting between multiple rotor cores, thereby reducing the J5 t pull during starting and arbitrary speed rotation.
Our goal is to provide technology that improves energy efficiency and efficiency.

In addition, by making all or part of the space between the rotor cores non-magnetic, it is possible to prevent leakage reactance, improve the torque characteristics and efficiency, or contribute to the strength of the rotor. This is also another point.

a3. In the present invention, the term "insulating material is attached to the conductor insertion hole and the conductor" is used, but "insulating material" is limited to the attachment of an insulating material to the conductor insertion hole or the conductor. The conductor insertion hole of the rotor core,
Alternatively, it is a general term that includes conductors whose surface layers are subjected to various insulation treatments.

The rotor configuration of the variable speed induction motor of the present invention can be any of the following types: normal squirrel cage type, double squirrel cage type, deep) 1-squirrel cage type, and special squirrel cage type with 1 winding type. The fact that a conductor can be inserted, or that a single-phase or three-phase motor can be formed can be selected and adopted as desired.

[Means for solving problems]

In order to achieve the above-mentioned technical problem, the present invention connects each of a plurality of conductors installed in each of a plurality of rotor cores that are fixed to a rotating shaft at arbitrary intervals to achieve integral rotation. the plurality of conductors are short-circuited and connected between the plurality of rotors 17 by a resistive material, and a plurality of stators are paired concentrically with the plurality of rotor cores and on the outer periphery thereof. In an electric motor, in which at least one stator among the plurality of stators arranged in parallel on a mountain pass and installed on the inner periphery of the machine frame is formed into a freely rotatable rotary stator and formed into a voltage phase device. , each of the windings wound around the plurality of stators is connected in parallel to a power source, and a driving device is provided that can freely rotate and fix the rotary stator, and a drive device is provided that connects each of the windings wound around the plurality of stators in parallel to a power source, and a driving device that is connected directly or indirectly to the rotor. A means for solving the problem is provided by a configuration in which the speed detector mounted on the vehicle and the drive device are connected via a control device.

In another aspect of the invention, a rotation position detector is provided on the rotation stator for detecting the rotation position of the rotation stator when the drive device connected to the control device is operated. In connection with this, a measure was taken in which the rotary position detector was connected directly or indirectly to a control device.

In another invention, the control device is equipped with a phase difference setting device that can change the phase difference of voltages induced from each of a plurality of stators within an arbitrary range of 0° to 180°, and Measures were taken to connect the drive to the device.

Furthermore, as another configuration of the present invention, the problem is solved by attaching an insulating material to a conductor insertion hole formed in the rotor core into which the plurality of conductors are inserted, one or both of the plurality of conductors. It was used as a means to resolve the issue. Furthermore, in another configuration of the present invention, all or part of the plurality of rotor cores is made of a non-magnetic material, and the plurality of conductors are connected between the rotor cores by a resistive material. This was also used as a solution.

(Function) When the rotary stator forming the voltage phase shifter is rotated in relation to at least one stator among the plurality of stators, the plurality of conductors wound around one rotor core are rotated. A phase shift occurs between the phase of the voltage induced between the rotor conductor and the other multiple conductors, and the degree of phase shift can be adjusted to increase or decrease the combined voltage induced in the rotor conductor by operating a voltage phase shifter. If controlled, the rotation speed of the rotor can be changed arbitrarily.

By the way, the windings wound around each of the plurality of stators are connected in parallel to a power source, and the plurality of conductors are connected through resistive materials between the plurality of rotor cores equipped with the plurality of conductors. Due to the short-circuited configuration, the current flowing through the resistance material is approximately (1/2) x (differential voltage induced in the rotor conductor from both the rotating stator and the stator) ÷ (resistance value of the resistance material). A proportional current flows, and a current approximately proportional to (the sum of the voltages induced in the rotor conductor from both the rotating stator and the stator)÷(the impedance of the rotor conductor) is superimposed and -C flows.

As a result, the slip and torque characteristics become a mixture of the characteristics when a secondary resistance is inserted in a general wound induction motor and the characteristics when the primary voltage of a general induction motor is controlled.

Even if the drive source is a fan, pump, etc. that has a reduced torque characteristic as a load, and the start/stop and speed change control is frequently repeated, if the speed control is input to the control device, the control device can be easily controlled. The drive device is actuated by the output signal to rotate the rotating stator which serves as a voltage phase device, and
This function communicates the detection signals of the rotational position detector and speed detector to the control device, and when the speed control value input to the control device is reached, the drive device automatically stops based on the output signal from the control device, so no human intervention is required. There is no need for troublesome operations, the speed change control device is simplified and the device is made inexpensive, and the problem of inducing harmonic interference does not occur.

In addition, since the conductor insertion hole is drilled in the rotor core or the conductor is equipped with an insulating material, even if the current flowing through the rotor conductor becomes crowded, especially during startup or low rotational speed operation, the conductor can be easily removed. No current leaks into the rotating core, and the currents flowing from the conductors on one side and the other side effectively flow through the resistive material and return, which prevents leakage current from the conductors and improves torque characteristics and efficiency. becomes.

Furthermore, by making all or part of the space between the rotor cores non-magnetic, leakage reactance can be prevented and torque characteristics and efficiency can be improved, and the strength of the rotor can also be improved.

〔Example〕

Examples will be described with reference to the drawings. Reference numeral 1 shown in FIG. 1 is a variable speed induction motor according to the present invention, and the induction motor v! 11 has the following configuration. 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.

The non-magnetic core 9 formed between the rotor cores 2 and 3 is made of asbestos, ceramic material, or earthenware with high heat resistance.

Synthetic resins (including non-magnetic Niko ceramics, etc.) (mica,
Silicone resin synthesized by mixing a few percent of asbestos, glass fiber, etc.
Silicone resin, fluororesin, etc.) aluminum, stainless steel is used, and openings are sometimes provided at appropriate locations in the non-magnetic core 9.

A plurality of conductors 5 and 5 are inserted in communication with the rotor cores 2 and 3.
. . . form an integral rotor 8 (details of which will be described later), and both ends of the plurality of conductors 5 . . . are connected by short-circuit rings 6 and 7. .

In addition, rotor cores 2, 3 and non-magnetic material] A9 and rotor 8
A plurality of ventilation cylinders 12 connected to both sides 10.11 of the...
・Establish. The plurality of conductors 5... installed in the rotor 8 are made of nichrome wires that serve as connecting materials for each of the plurality of conductors 5... in the non-magnetic core 9 portion between the rotor cores 2 and 3. , carbon-laced steel.

They are short-circuited and connected via a resistive material r such as conductive relamic. A plurality of cooling bodies 13 made of a material with a high heat dissipation effect are installed on the inner side end face of the rotor A2゜3.
It is formed.

The cooling member 13 can be formed by forming a cooling fan on the non-magnetic core 9 using a non-magnetic material, or by forming the cooling member 13 into various shapes and attaching it to both sides of the rotor cores 2 and 3. The effecting body 13 shall be insulated. In some cases, the cooling body is attached to the rotor shaft 4, and the cooling body 13 may be formed with a plurality of resistive materials r, for example, in a zigzag shape or any other desired cooling stirring body. . Bearing discs 15 and 16 provided on both sides of the cylindrical machine frame 14 are connected to connecting rods 17 with bolts at both ends...
The rotor 8 is integrally assembled with the and nut 18...
Cooling impellers 19 and 20 are installed on both sides of the rotor shaft 4.
Bearings 21, 21 with both ends fitted in bearing discs 15 and 16
The rotor 4 is rotatably supported.

As shown in FIGS. 1 and 2, a rotating stator 31 having a winding 22.23 on its outer side and a second stator 25 are arranged concentrically with respect to the rotor A 2.3. Installed in parallel, machine frame 14
A stop ring 2 is provided with a vertical bearing 26 between the rotary stator 31 and the rotating stator 31, and the vertical bearing 26 is fitted into the machine frame 14.
The machine frame 14 and the second stator 25 are fixed by a ventilation fixing ring 2 with ventilation windows in several places.
7A is fixed by a fixing ring 27B. Rotating stator 3
A gear = 33 is fitted on the outer peripheral surface of one side of the machine frame 1.
A drive gear 36 is pivotally attached to a small motor 35 for forward and reverse rotation, which is formed by a drive device 29 fixedly installed on the outer periphery of the machine frame 14, and a plurality of exhaust ports 39 are bored in the outer periphery of the machine frame Board 15.
16 is provided with a plurality of common holes 40....

Further, as shown in FIG. 3, each of the rotary stator 31 and the second stator 25 is star-connected and provided with windings 22 and 23 (delta connection may also be used, and pole-converting windings are provided). ), each winding 22, 23 is connected in parallel to the power supply.

The space 66 formed by the rotor core 2.3FjJ, the rotary stator 31 mounted on the sliding bearing 26, and the second stator 252 frame 14 fixed to the general fixed ring 27A and the fixed ring 2713 (ventilation) 167, a plurality of openings are opened in the machine frame 1 to communicate with the air outlet 67, and the plurality of openings are formed into an arbitrary number of ventilation ports 68 and six ventilation ports. III Z(〕' 71 is attached to the shaft of the motor 72 and the blower cylinder 70 is attached to the blower device 7
3, the motor 72 is formed to be capable of forward and reverse rotation, and is connected to arbitrary speed change means such as a voltage regulator and an inverter, and a controller Mh 65 equipped with an indicator and a switch is connected to the speed change means. , Ventilation 1] The temperature detector 64 attached to the ji 67 and the control mechanism 65 are connected. The blower device 73 is fixed to the machine frame 14, and the suction part 74A of the blower device @73 is connected to the ventilation port 69 to communicate with the ventilation barrel 67, and outside air is introduced from the other side of the ventilation port 69]] 68 is connected to the ventilation barrel 67, and the ventilation barrel 70 has an exhaust section 74.
B is the shape. Further, a cooler, a condenser, a refrigerant gas, and other various refrigerant devices may be connected to the air outlet 69 directly or through a pipe.

The drive gear 36 partially inserted into the machine frame 14 through the opening 37 is engaged with the gear 33 fitted to the rotary stator 31, and a small motor 35 equipped with a drive device 29 and a control switch is assembled. The rotary stator 31 is connected to the rotary stator 31 via the rotary shaft A7-33 and the drive gear 36, and the rotary stator 31 is rotatable through the rotary shaft 1 m If430, and the rotary stator 31 is rotatable and fixed to the machine frame 14 52 A rotating stator 31 which is rotatable in relation to the stator 25 is formed in the voltage phase shifter 103, and the voltage phase shifter 103 achieves this purpose in addition to the above embodiments. Various options can be selected and adopted.

A magnetic sensor 32 is attached to the outer peripheral surface of the rotating stator 31,
Related to magnetic sensor 4 no-32-C! A plurality of magnetic detectors 34 with different terminal diameters for detecting the air are embedded in a non-magnetic plate 41, the non-magnetic plate 41 is attached to the inner peripheral surface of the machine frame 14, and the magnetic sensor 32 and A rotational position detector 42 is formed by the magnetic detection bodies 34..., and the magnetic sensor 32 inputs the rotational position of the rotation stator 31 set for each magnetic detection body 34... It is electrically connected to a display device 43. Reference numeral 38 is a solenoid that controls the entry and exit movement of the protrusion, and the solenoid 38 is connected to the machine frame 17! A speed detector 44 such as a generator is mounted on the rotor shaft 4, and the protruding piece is attached to the gear 33 fitted to the rotary stator 31, and a speed detector 44 such as a generator is mounted on the rotor shaft 4. A speed detector 44 is connected to a speed indicator 45. Note that the speed detector 44 is not limited to being mounted on the rotor shaft 4, but can be mounted on the rotor core 2, a non-contact rotary sensor such as a S1-Robo type tachometer or a Hikari City tachometer. 3. Non-magnetic core 9, conductor 5...
It may be installed and used in connection with etc.

Next, the rotor core 2.3 shown in FIG. 4 will be explained.

The rotor 2,
3. Insert the non-magnetic core 9 and place it on top. To explain the rotor cores 2 and 3 in more detail, the rotor cores 2 and 3 are formed into an integral rotor 8 by polymerizing and connecting a plurality of silicon steel plates 77, both sides of which are coated with phosphoric acid. Ru.

The silicon steel plate 77... has a plurality of conductor insertion holes 78..., and the shorting ring 6 is inserted into the center shaft 75 at the lowest stage to form the silicon steel plate 77 of a predetermined thickness. ...is polymerized and placed on top. Rotor core made of silicon steel plates overlaid to a predetermined width 2.
Insulating tubes 79 of the same length are inserted into each of the conductor insertion holes 78 of No. 3.

The insulating tube 79 is formed into a thin duplex made of a synthetic resin (silicon resin, silicone resin, fluororesin, etc.) mixed with a few percent of particulate matter such as mica, asbestos, or glass fiber, and is made of a thin duplex containing a plurality of conductors 5. . . . A resistance material r .
a, and the plurality of conductors 5 protruding from the non-magnetic core 9a are inserted into the inner peripheral surface of the insulating tube 79 inserted into the conductor insertion hole 78 of the rotor core 2. . Next, contrary to the above, a non-magnetic core 9l) is inserted on the opposite side of the plurality of conductors 5... to which the resistive material 1''... is welded, and the conductor protruding from the non-magnetic core 9b is inserted. An insulating tube/79... is inserted into each of the silicon steel plates 77... of a predetermined width through the insulating tube 79...
That is, the rotor core 3 and the short-circuit ring 7 are inserted into the conductor 5 . The insulating tube 79... is the conductor insertion hole 78...
... may be glued to the above short circuit rings 6, 7,
Rotor'a2゜3, conductor 5..., non-magnetic core 9a
, 9b in turn, fix the shorting ring 6 and rotate the other shorting ring 7, and after squeezing the plurality of conductors, insert both ends of each conductor 5... is struck by the header to completely tighten the short-circuit rings 6, 7 and the conductor 5 (=J'), and the rotor cores 2, 3 and the non-magnetic core 9 are integrated into the rotor 8. Note that each of the above-mentioned work steps is mainly performed by automatic equipment.

In addition, the insulation tube 79 inserted into the rotor core 2゜3
Apply an insulating resin paint to the conductor 5 to be inserted into the inner circumferential surface of the d-3. Even if it is thin, there is no need to worry about poor insulation between the conductor insertion holes 78 and the conductors 5. In addition, in electric motors that are used only in the high-speed rotation region where the starting torque is small and are used only in the high-speed rotation range, insulating resin paint is applied to the conductor 5 without using the insulating tube 79. However, the surface of the conductor 5 coated with insulating resin coating Y31 should be baked and dried rather than air-dried to improve insulation and durability. It is also desirable in

The effects of the above configuration will be explained below.

When the windings 22, 23 are energized from a commercial three-phase power supply, a rotating magnetic field is generated in the rotating stator 31, 25, a voltage is induced in the rotor 8, and a current flows in the conductor 5 of the rotor 8. The rotor 8 rotates. The second stator 25 with respect to the rotating stator 31
When the amount of rotation of each is set to zero, there is no phase shift in the magnetic flux of the rotating magnetic field generated in each stator 31.25, and as will be described in detail later, the resistance material 1, which serves as a connecting member, has a current Since no current flows, it has the same 1 to 1 luc special bamboo as a general induction motor.

Next, a case will be described in which the small motor 35 is operated to rotate the rotary stator 31, and the rotary stator 31 is rotated by an electric phase angle of θ. Rotating stator 31 and second stator 25
The magnetic flux of the rotating magnetic field created by φ1. The phase of φ2 is shifted by θ, so the voltage (=1, (
The phase of =2 is θ (shifted. Now, the second stator 25
The voltage d2 induced in the conductor 5 of the rotor 8 by
, and the voltage is 62=31E. Here, S is slip and E is the induced voltage when slip is 1.

At this time, the voltage d1 induced in the conductor 5A by the first stator 24 becomes 6+=SEεjO.

(Induced voltage when E-slip 1) What is shown in Fig. 5 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, and when the phase of the 2 J+- voltage is θ-0°, the active power P is maximum,
The edge of Oo〈θ〈180° is smaller than that. Here, if the resistance and inductance of the conductors 5 are R and L, and the angular frequency of the power source is ω, then the maximum of the effective power ( ) appears at S=(R/ωL).

Since the active power P is proportional to the driving torque of the induction motor 1, the voltage induced in the rotor 8 is generated by operating the small motor 35 and rotating the rotary stator 31 relative to the second stator 25. The rotor speed can be adjusted and controlled steplessly.

Next, let the respective resistances from the short-circuit rings 6, 7 of the conductors 5 of the rotor 8 to the connecting material be R+ and R2, the inductances L+ and l-2, the angular frequency of the power source be ω, and each If the resistance of the resistive material that short-circuits each of the conductors 5 is set to r, the electrical equivalent circuit of the rotor 8 becomes as shown in FIG. 6, with the symbols I+, I2, . i3 indicates the current flowing through each branch.

Next, when converting the circuit shown in FIG. 7 into an equivalent circuit viewed from both stators 31 and 25 side, it becomes as shown in FIG. 6, and R+ =
When R2, LI=L2 and θ-0°, T3 = II-
12=0, and no current flows through the resistor material r. This means that at θ-〇°, h-lux T is equal to the value when r does not exist. Therefore, θ=0
°, it has the same torque characteristics as a conventional induction motor.

Next, when R+ = R2, l-1-L2 and θ-180°, I+ = -12, l3 = II-12 = 2I+, 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 [-+-2r.

As the rotor 8 rotates, outside air is sucked into the machine frame 14 by the cooling impeller 19 and 20 through the ventilation holes 40 bored in the bearing discs 15 and 16, and the cooling impeller 19 draws the outside air into the machine frame 14. 2
29 rotor] Acore conductor 5... etc. are cooled and the exhaust hole 3
9A... to the outside of the machine frame 14, and the cooling train 2
0, the surplus air sucked by the impeller 19 flows into the ventilation barrel 12..., cools the rotor core, the non-magnetic core 92, and The sucked air is combined with the winding 23. The second stator 25 is ventilated and cooled, and the exhaust air is discharged from the ventilation holes 39B of the machine frame 14 through the ventilation window of the ventilation fixed link 27A, and the windings 22, 23, the rotor core 2 , 3. Non-magnetic material 9.
A function is stably exerted on each of the conductors 5...

The speed of the rotor 8 can be changed arbitrarily by controlling the phase shift using the rotary stator 31 and increasing or decreasing the current flowing through the conductors 5 of the rotor 8. I can do something.

When each of the windings 22 and 23 of the rotary stator 31 and the second stator 25 are connected in parallel to a commercial three-phase power supply, the input to the windings 22 and 23 of the rotary stator 31 and the second stator 25 is The voltages are equal and from each of both stators 31.25 to rotor 8
The voltages induced in the conductors 5... are the same, and the phase of the voltage is solely responsible for PO, and the current flowing through the resistors t, Jr..., which serve as connections between the multiple conductors 5... , (1/
2) The current is approximately proportional to (differential voltage induced in the rotor conductor from each of the first and second stators)÷(resistance value of the resistance material r...). However, in the conductor 5 of the rotor 8, the current flowing through the resistive material 1... is approximately equal to (sum voltage induced in the rotor conductors of both stators) ÷ (impedance of the rotor conductor). Proportional currents flow in a superimposed manner. (The above sum voltage is zero at PO-π and maximum at PO-〇, and the impedance of the rotor conductor is composed of the resistance of the conductor and the secondary leakage reactance, respectively, so it varies depending on the slippage.) Therefore, the conductor of the rotor 8 The ratio of the current flowing between the plurality of conductors 5 through the resistive material r to the magnitude of the current flowing through the conductors 5 varies depending on the slip and resistance value even if PO is constant. The slip and torque characteristics when PO is constant are the characteristics when the secondary insertion resistance of a general wound induction motor is constant, and -
The characteristics are shown in Figure 9, which is a mixture of the characteristics when the primary voltage of a general induction motor is controlled, and these characteristics are as follows.
The range of speed control becomes narrower than the characteristic when the windings 22 and 23 of both stators 31 and 2b are connected in series. However, the present invention does not exhibit excellent torque characteristics when used as a drive source with reduced torque characteristics as a load, such as a fan or pump, and as an electric motor that frequently repeats C1 start/stop and speed change control. Figure 8 shows constant torque characteristics, while Figure 9 shows reduced torque characteristics.

Next, leakage of current flowing through the rotor conductors will be explained with reference to FIGS. 4 and 10.

The current flowing through the conductor (electromotive force) is expressed as e=vBQ (
B...magnetic flux density, fl...length, ■...speed).

If the insulation between the conductor and the silicon steel plates 77a to 77f is perfect at points A to F of the conductor 5, the sum of the electromotive force e induced in the conductor (points A to F) is P. The line will be shown as .

The magnitude of the electromotive force P generated at points A to F of the conductor 5 is determined by the size of the resistive material r, and if the electromotive force is 1, then the A of the conductor 5
The direction increases proportionally from point F to point F, but if the conductor 5 and the conductor insertion hole 78 of the silicon steel plate 77 are not insulated in any way, the resistance material 1. The larger the electromotive force P is, the more current leaks from point F of the conductor 5 to the IT point of the silicon steel plate 77, and the current flowing from point F of the conductor 5 to the resistive material r decreases, increasing the rotational torque of the rotor. This results in a significant drop in efficiency, resulting in a reduction in efficiency.

However, in the present invention, since either or both of the conductor insertion holes 78 of the silicon steel plates 77 and the conductors 5 are insulated, even if the resistive material 1 is made large, No current leaks from the conductors 5 to the silicon steel plates 77, which greatly improves torque characteristics and efficiency.

By the way (see FIG. 2), if the rotational position of the rotary stator 31 detected by the magnetic sensor 32 is, for example, 60 degrees in electrical angle when the variable speed induction motor 1 is at a'3 at the start of operation, the rotor If the power is turned on without considering the starting characteristics of the load connected to the shaft 4, it may become impossible to start the electric motor 1 or the starting equipment may fail if the load that requires a large starting torque is connected. In the past, securing sufficient capacity was a problem, but the feature of the present invention is that the starting device is downsized, and the starting device is made smooth and the speed is freely variable. Before the electric motor 1 starts operating, the magnetic sensor 32 of the rotation position detector 32 detects where the rotation fixed position of the rotation stator 31 is. For example, the magnetic sensor 32 detects the rotating position of the rotating stator 31 from the magnetic sensing body 34c and communicates it to the display 43, and the display 43 uses the signal value to indicate the rotating position of the rotating stator 31 electrically. The digital display shows that the angle is 60°. Based on the rotation position display, the solenoid 38 is operated to release the gear 33 from the lock position, and the switch is used to reverse the small motor 35 to correspond to the starting characteristics of the load connected to the rotor shaft 4. For example, when the rotational position of the rotary stator 31 is set to 150 degrees in electrical angle, the magnetic sensor 32 detects the magnetic sensing body 34. f is detected and the small motor 35 is operated until the target starting rotational position of 150° of the rotary stator 31 is displayed on the display 43, and when the target starting rotational position is displayed, the small motor 35 stops operating. At the same time, the solenoid 38 is activated to lock the gear 33 and fix the rotation of the rotating stator 31.

After the above operation is completed, when the windings 22 and 23 are energized from the power supply, the rotor shaft 4 starts the rotary stator 31 at a smooth rotational speed corresponding to the starting rotation position, and then the solenoid 3
8 to unlock the gear 33, operate the switch to rotate the small motor 35 in the forward direction, detect changes in the rotational speed of the rotor shaft 4 with the speed detector 44, and detect the change in the rotation speed of the rotor shaft 4. When the speed indicator 45 detects that the rotational speed has reached the desired rotational speed, the small motor 35 is stopped and the solenoid 38 is activated to lock the gear 33 and fix the rotation of the rotary stator 31.

Note that the rotational position of the rotational stator 31 at the time of startup is set to an arbitrary rotational position corresponding to the startup characteristics of various loads connected to the rotor shaft 4, and the magnetic It goes without saying that mounting any number of sensors 32 may be selected as appropriate.

Further, the rotational position detector is not limited to the above-mentioned embodiments, and may include the limit 1 to switch.

It can be implemented by forming a plurality of photosensors, etc., or by selecting a rotary encoder equipped with a control function or other various rotational position detectors.

After adjusting the target rotation position, when the start switch is input and the motor 72 of the blower device 73 is activated to rotate the windmill 71, the wind turbine 71 sucks the outside air into the blower port 6.
8 to the ventilation shell 67, and the outside air is passed to the cooling body 13.
The inside of the ventilation shell 67 is stirred to cool and radiate heat from the non-magnetic core 9 or the conductor 5 . . . , the resistance material r .
The air inside the air blower 11470 is sucked into the air blower body 70 through the air outlet 69 and is exhausted to the outside of the air blower 11470 through the air outlet part 74B.

In the case of operation in a high speed region, the air blowing action of the cooling impeller 19, 20 sucking outside air is circulated through the ventilation barrel 12... to cool the rotor cores 2, 3 and the non-magnetic core 9. , the conductor 5..., the resistor material r... exerts a heat dissipation effect, and the exhaust air is discharged to the air exhaust cylinder 39A....

Since it is discharged from each of 39B..., the resistance material r.
The heat generated by ... does not become very high and no heat is stored. However, in the low-to-medium speed rotation range where the speed is changed, the heat generation of the resistance material I... increases rapidly, so the air blowing action of the cooling impeller 19, 20 alone causes the resistance material r...
However, the blower device 73 introduces outside air into the ventilation shell 67 to cool and radiate heat from the non-magnetic core 9 and the resistive material r, and exhausts the waste heat from the ventilation shell 67.
, the resistance material r... is cooled and heat radiated regardless of the change in the rotational speed of the electric motor 1, thereby effectively increasing the electric rotation efficiency, and reducing the heat generation of the resistance material "..." and its heat release. The durability of each of the non-magnetic cores 9 involved in heat generation can be improved and maintained.
This reduces leakage reactance and contributes to improved leakage characteristics and efficiency.

Note that the exhaust port 74B of the blower 73 is connected to an arbitrary number of air outlets 68 provided in the machine frame 14, and outside air is introduced into the ventilation shell 67 by the air blowing from the air blower 73, and the air is discharged from an arbitrary number of air outlets 68. Exclude from Nosu 1 Kawaro 69 J: You may also configure it. In any case, the air outside the machine is introduced into the ventilation shell 73 from one side of the machine frame 14, and the exhaust air is exhausted from the other side of the machine frame 14. 7II effective cooling and heat dissipation effects! ! J-Kotakade, ventilation port 68. There may be a plurality of exhaust ports 69.

Moreover, if cooling air is introduced into the ventilation Jji 67 from the ventilation opening 68 by an arbitrary refrigerant device and the air inside the ventilation cylinder 67 is cooled, non-magnetic] a9. Cooling heat dissipation to the resistor material r... is prevented more effectively. The blowing device @73 sometimes controls the rotational speed of the motor 72 toward high-speed rotation as the rotor shaft 4 changes speed from high-speed rotation to low-speed rotation. When the motor 1 is operating at high speed, the refrigerant device controls the motor 72 or one of the refrigerant devices to turn on and off as appropriate, and prioritizes energy saving while checking the relationship with the electric efficiency of the motor 1 based on data. There may be cases where Soshi-C temperature detector 64
The motor 72 can be automatically operated using the signal obtained by the controller M465. Note that the blower device 73 can be arbitrarily selected and implemented by disposing it elsewhere and communicating with the blower port 68 or the blower outlet 69 through the ducts 1 to 6, without directly connecting it to the machine frame 14. be.

What is shown in FIG. 11 is the silicon steel plate 7 of the rotor cores 2 and 3.
7... are overlapped and connected, and a plurality of conductor insertion holes 78...
This figure shows an example in which an insulating paint is applied to each of the parts.

The rotor cores 2 and 3 are insulated, for example, by the following method. A rotor core mounting board 81 is rotatably mounted on a workbench 80, a central shaft 82 is fixedly mounted on the rotor core mounting board 81, and a servo is installed to control the rotation of the rotor mounting board 81. Connect the motor 83 to the workbench 8
A paint spraying device 85 is mounted on a pillar 84 erected at 0, so as to be movable up and down.
is hung horizontally on the column by support rods 87.87, and the paint tank 86 is equipped with a heater 88 and a spray control device 89 with an air compression valve. A stirring device 90 equipped with a motor and a motor 91 controlled by the -L lower ejector are installed respectively, and a flexible and elastic spray pipe 92 is provided extending from the bottom of the paint tank. , 93 is a mask plate that prevents paint from adhering to the surface of the silicon steel plate.

In the above-described apparatus, the paint tank 86 is filled with any insulating paint, and the heater 88. A stirring device 90 heats the paint and stirs it so that there are no spots. Next, the servo motor 83. is activated by a signal set in the control device. The motor 91 is activated, the rotor core mounting plate is rotated and stopped at a predetermined position C, the paint spraying device 85 is lowered, and the spray pipe 92 is inserted into the lower part of the conductor insertion hole 78 of the rotor A2, 3. Then, while operating the spray controller 90 to apply paint to the inner peripheral surface of the conductor insertion hole 78, the paint sprayer 85 is moved upward by the motor 91, and the conductor is inserted into the silicon steel plate 77 on the uppermost stage. When the application to the hole 78 is completed, the spray from the spray controller 90 stops, and when a small amount of the lower end of the spray tube 92 flows out from the mask board 93, the motor 91 stops, and the above-mentioned operation continues thereafter. .

Since the skew of the conductor insertion hole 78 by the plurality of silicon steel plates 77 is already performed by the Skico control device, even if the conductor is inserted into the conductor insertion hole 78 after applying the insulating paint, It is effective to perform high-temperature baking and drying treatment after applying the paint to prevent insulation defects. We can also plasma spray any insulating powder material.

The use of thermal spraying means to form an insulating material can be arbitrarily selected and carried out as required.

Note that the effect of preventing leakage current from the conductor 5 by applying insulating paint to the conductor insertion hole 78 is similar to the effect described in connection with FIG. 10 above, so the details will be explained below. The details will be omitted here.

In addition to the embodiments described above, the conductor insertion holes 78 and 78 of the rotating cores 2 and 3
... or the surface layer of the conductor 5...
Alternatively, both sides may be treated with an insulating positive oxide film to form an insulating material, and if the conductor 5 is made of aluminum, an alumite film treatment may be applied to reduce durability due to oxidation. can be prevented. Then, if Teflon (registered trademark) coating is applied to the surface of the conductor insertion holes 78, conductors 5, etc., which have been subjected to anodized coating treatment, or after coating with any of the above-mentioned synthetic resin paints, an insulation effect can be achieved. Durability can be adjusted to suit the needs of the user.

Further, in addition to the above embodiment, the rotor cores 2 and 3 have conductors 5 and 5.
For example, connect aluminum or other high resistance materials to short-circuit rings 6, 7.
In many cases, they are integrally cast together with the cooling impellers 19, 20, but in this case, as described above, the insulating tubes 79 or insulating paint are applied to the conductor insertion holes 78 of the rotor cores 2, 3. If the casting process is performed after the conductor is installed in the conductor, a stable and constant dimension can be ensured between the cast conductor and the conductor insertion hole 78, so that the cast conductor does not cause insulation defects.

Moreover, instead of integrally casting as described above, for example, the conductors 5 are inserted into the conductor insertion holes 78 of the rotor cores 2 and 3, and the conductors are inserted into the conductor insertion holes 78. Even when filling and injecting the synthetic resin described above into the space of the conductor 5..., when filling and injecting the synthetic resin, the conductor 5...
· may be pushed in one direction (=I) and lead to poor insulation, but the insulation tubes 79... may be pushed in one direction by the conductor insertion holes 78... of the rotor cores 2 and 3. or apply insulating paint, insert the conductor 5... into the conductor insertion hole 78, and then fill and inject synthetic resin into the conductor insertion hole 78... The insulating effect of the conductors 5 is strong, there is no leakage current of the conductors 5, and oxidation due to ventilation is prevented, resulting in improved durability.

And, it is not something that continues to run and stop frequently,
In the electric motor of the present invention whose speed change control range is medium-speed and high-speed rotation ranges, but whose torque characteristics are the main focus, the rotor core 2 is
, 3 conductor insertion hole 78... (silicon steel plate 77...), or applying an insulating paint to one or each of the conductors, or applying a non-magnetic material to the conductor protruding from A 9a, 9b. 5... Filling and injecting the various insulating synthetic resins of arbitrary thickness in a ring shape, or non-magnetic material 9a,
The conductor 5 can be inserted into the inner peripheral surface of both ends of 9b,
If various shapes are formed on the outer circumferential surface, such as a shape that can be inserted into the conductor insertion hole 78..., the resistance material 1... may be formed of a low resistance material in the medium to high speed rotation region. Therefore, the sum 1] of the electromotive force of the conductor 5 is not large enough to generate the electromotive force required in the low rotation region, so the sum 1] of the electromotive force of the conductor 5 should be extended especially around the entire length of the conductor insertion holes 78 of the rotor cores 2 and 3. No need for insulation.

What is shown in FIG. 12 is a connection between a plurality of conductors 5 installed in each of the rotating cores 2 and 3 in the space between the rotors 172.3 or in the non-magnetic core. A resistance material 1 that serves as a connecting material with a high resistance ring 94 that is inserted into the rotor shaft 4
This is an example in which a short circuit is caused by . Even if the resistor lJr is not connected to all the conductors 5..., it can obtain a suitable effect. Note that the high-resistance ring 94 may be made of a general electrically conductive material instead of a high-resistance material.

Next, one embodiment of automatic control of a variable speed induction motor will be described with reference to a block diagram shown in FIG.

(See FIGS. 1 and 2) Input/output control circuit 96, control circuit 97. Arithmetic circuit 98. A speed detector 44 such as a tachometer generator equipped with a speed indicator 45 mounted on the rotor shaft 4 and a voltage for detecting the rotational position of the rotation stator 31 are connected to the input side of the control device 95 consisting of a memory circuit 99 and the like. Phase difference detector 4
2, a temperature detector 64 attached to the appropriate position of the ventilation trunk 67,
A keyboard 101 equipped with an activation switch 100 and a display is connected to a voltage phase difference setting device 102, and a small motor 35 (voltage phase difference setting device 102) is connected to the output side of the control device.
3) are connected to the motor 72 of the feeding device 73 for cooling and radiating heat from the conductors 5, . . . , the resistive material r, . The following control values are input from the keyboard 101 to the storage circuit 99 of the control device 95. That is, the voltage phase difference detector 4 detects the rotational position of the rotational stator 31 corresponding to a phase angle of 0° to 180°.
2, a speed control value that controls the rotation speed of the T-Turf 2 with respect to the set value of the phase difference, and a speed control value that is connected to the rotor shaft 4. The motor 7
2 and the reference temperature setting value to be controlled to increase or decrease.

At the start of operation, when the operation preparation key is input from the keyboard 101, the voltage phase difference detector 42 detects the rotating position of the rotary stator 31 and displays it on the display.
When an arbitrary starting phase difference setting value that matches the starting characteristics of the load connected to the rotor shaft 4 is input from the voltage phase difference setting device 102, a signal output from the memory circuit 99 of the control device 95 is received and the solenoid is activated. 38 to unlock the gear 33 fitted to the rotary stator 31, and also activates the small motor 35 to rotate the rotary stator 31 to confirm that the desired starting phase difference position has been reached. When the voltage phase difference detector 42 detects this, the small motor 35 automatically stops.

When readiness for operation is displayed on the display, a phase difference setting value for arbitrary operation is input to the control device 95 from the voltage phase difference setting device 102 according to the starting torque of the load connected to the rotor shaft 4, and the operation position is set. The rotation speed of the small motor 35 is calculated to obtain the phase difference setting value. When the start switch 100 is activated and an input signal is sent to the control device @95, the output signal of the control device 95 is received (and the small motor 35 is activated to rotate the rotary stator 31, and the input operation is started. When the voltage phase difference detector 42 detects the phase difference setting value for the small motor 3
Stop 5.

Then, the speed value detected by the speed detector 44 attached to the rotor shaft 4 is compared with the speed control value set in the control device 95, and if there is a difference in speed, the control device 75 The rotational speed is outputted to the small motor 35 to correct and control the rotational speed, and the solenoid 38 is operated to lock the rotating stator gear 33.

Corresponding to the starting phase difference set value or the running phase difference set value set in the voltage phase difference setting device 105, the output signal from the control device 5 controls the rotational speed of the motor 72 to a high side or a low side. Ru.

When the temperature detection value of the temperature detector 64 communicated to the control device 5 becomes higher than the base tP-set value set in the memory circuit 99, the rotation speed of the motor 72 is corrected by a signal output from the control device 95. Then, the ventilation effect in the ventilation cylinder 67 is increased to restore the normal function of cooling and dissipating heat from the non-magnetic cores 9 . . . , the resistive material r . . . . Furthermore, regardless of the phase difference control of the voltage phase difference setter 102, the temperature detector 6
The control device 9 so that the detected value of 4 becomes the reference temperature set value.
The rotational speed of the motor 72 of the blower field 73 may be controlled to increase or decrease, or to be turned ON or OFF by the output signal from 5.

In the case of a structure in which the stator is provided with a pole conversion winding (in this case, the rotating core is wound with a winding), the output side of the control device 95 is connected to a wire connection selector switch. If the transmission line is connected to the transmission line, it is possible to automatically perform a wide range of gear changes in response to a load reduction of 1 to 2 hours. In addition, a connection switch is provided to switch the connection of the windings wound around each of the rotary stator and stator to either delta connection or star connection. By configuring the system to automatically switch between the two modes, the shift range can be expanded.

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 rotational speed that achieves the minimum fuel consumption of the internal combustion engine, and even when the power from feng shui as an energy source is weak and unstable, the rotational speed 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 using an expensive synchronization wave. 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 device, it can also be used as an electric brake, and by controlling the rotation speed with the voltage phase device, it is possible to efficiently adjust the braking force of the IC rotating shaft by connecting it to the rotor shaft.

〔Effect of the invention〕

As explained above, according to the present invention, the windings wound around each of a plurality of stators are connected to a power source in parallel, and each of the conductors attached to a plurality of rotor cores is connected to a resistive material. Since the short circuit occurs through the The speed change range can be accurately set to any speed value from low speed to high speed.

In addition, there is no need to use expensive devices such as inverters and transformers for speed control equipment, and the configuration costs can be lowered.In addition, it is easy to operate and does not generate harmonic interference, which is different from conventional equipment. It has a remarkable effect.

It was also discovered that the resistance material generates a strong and unique rotational torque, which causes current to leak from the conductor to the silicon steel plate of the rotor core, reducing efficiency. By attaching an insulating material to either the conductor insertion hole provided in the rotor core, the conductor, or both, even when a strong current flows from the conductor to the resistance material as rotation torque, the conductor will not rotate. No current leaks to the silicon steel plate of the child core, effectively increasing the current flowing through the resistor material, improving torque characteristics and efficiency, and C is extremely noticeable, especially at startup and in low-speed rotation areas. Qin cover effect. Furthermore, by making all or part of the space between the rotor cores non-magnetic, it is useful to reduce leakage reactance, improve C torque characteristics and efficiency, and improve the strength of the rotor.

[Brief explanation of the drawing]

1 to 13 are illustrations of embodiments of the present application. Fig. 1 is a side sectional view of the induction motor, Fig. 2 is a side view showing the rotation mechanism of the rotating stator and the blower, and Fig. 3 is a side view showing the rotation mechanism of the rotating stator and the air blower. The connected wiring diagram, Figure 4 is an example in which an insulating tube is installed in the conductor insertion hole of the rotating core, Figure 5 is a diagram showing the relationship between rotor slip and active power, and Figure 6 is a diagram showing the relationship between rotor slip and active power.
The figure is an electrical equivalent circuit diagram of the rotor, Figure 7 is an electrical equivalent circuit diagram seen from the stator side, Figure 8 is a diagram that does not show the relationship between 1 and torque due to the resistance material, and Figure 9 is a diagram of the reduced torque and Figure 10 is a diagram showing the relationship between slips, Figure 10 is a diagram explaining the electromotive force flowing in the conductor, Figure 11 is an example of applying insulation paint to the conductor insertion hole of the rotor core, and Figure 12 is a diagram explaining the electromotive force flowing in the conductor. FIG. 13 is a partial sectional view showing a resistance material connected between conductors, and FIG. 13 is a block diagram without showing the automatic control configuration. 1... Induction motor, 2, 3... Rotor core, 4...
・Rotor shaft, 5... Conductor, 6, 7... Short circuit ring, 8.
...Rotor, 9.9a, 9b-...Nonmagnetic core, 10
, 11... Side part, 12... Ventilation barrel, 13... Cooling body, 13A... Cooling wing body, 14... Machine frame, 15
．． 16... Bearing plate, 17... Connecting rod, 18... Nut, 19° 20... Cooling impeller 21... Bearing, 2
2.23...Winding, 25...Second stator, 26...
・Sliding shaft, 27... Fixed ring, 28... Stop ring, 29... Drive device, 30... Rotating mechanism,
31... Rotating stator, 32... Magnetic sensor, 33
...Gear, 34,34a-34a...Magnetic detector, 35...Small motor, 36...Driving gear, 3
7... Opening, 38... Solenoid, 39... Ventilation hole, 40... Ventilation hole, 41... Non-magnetic plate, 42...
...Rotation position detector, 43...Display device, 44...Speed detector, 45...Speed indicator, 64...Temperature detector, 65...Control equipment, 66... Space department, 67...
・Ventilation barrel, 68...Blower port, 69...Ventil exhaust port, 70
...Blower cylinder, 71...Windmill, 72...Motor,
73... Air blower, 74A... Air suction 1] part 74B.
... υ1 air opening part, 75 ... center axis, 76 ... jig stand, 77 ... silicon steel plate, 78 ... conductor insertion hole, 79 ...
... Insulation duplex, 80 ... Workbench, 81 ... Rotor core mounting board, 82 ... Central shaft, 83 ... Servo motor, 84 ... Support column, 85 ... Paint spraying device , 8
6... Paint tank, 87... Support rod, 88... Heater, 89... Spray controller, 90... Stirring device,
91... Motor, 92... Spray pipe, 93... Mask board, 94... High resistance ring 95... Control circuit, 98
... Arithmetic circuit, 99 ... Memory circuit, 100 ... Start switch, 101 ... Keyboard, 102 ... Voltage phase difference setting device, 103 ... Voltage phase device. Patent applicant Satake Seisakusho Co., Ltd. Figure 5 Figure 6 March 9, 1988 1. Incident display Otsu? -Ge(?, 7 Showa 63 Riki 3 3. Relationship with the case of the person making the amendment Patent applicant Den-o (031 263)
- 31115, Number of claims increased by amendment None 6, Subject of amendment 7, Contents of amendment (1), Page 30 of the specification, Line 12 [Flowing current is (electromotive force)] changed to "Induced electromotive force If it is e, correct it to j. (2), page 30, line 13 "Ω...length" is changed to Ug・
...The length of the conductor facing the stator" is corrected. (3), page 30, line 13 [V...
...corrected as the difference between the speed of the rotating magnetic field and the speed of the rotor. (4), page 30, line 14 [electromotive force e induced in the conductor]
The sum of removes j. (5), page 30, lines 18-19 “Point A to F of conductor 5
The magnitude of the electromotive force P at a point is determined by the magnitude of the resistive material r, so delete ". (6), page 31, lines M3-4, ``The larger the resistive material r is, the larger the electromotive force P is'' is deleted. (7), page 31, line 4, “1 point of conductor 5” is changed to “conductor 5
For example, 1 point. (8), page 31, lines 4 and 5, "Point F of silicon steel plate 77" is corrected to "Point F of silicon steel plate 77". (9), page 31, line 5 “The point F of conductor 5 is
” he corrected.

Claims (5)

[Claims] (1) A plurality of conductors installed in each of a plurality of rotor cores fixed to a rotating shaft at arbitrary intervals are connected to form an integral rotor, and the plurality of conductors are connected to each other to form an integral rotor. The plurality of conductors are short-circuited and connected between the rotor cores by a resistive material, a plurality of stators are arranged in parallel and facing each other concentrically with the plurality of rotor cores and on the outer periphery of the plurality of stators, and the plurality of stators are fixed. In an electric motor in which at least one stator among the stators is formed into a rotatable rotary stator to form a voltage phase device, each of the windings wound around the plurality of stators is connected in parallel to a power source. and a drive device capable of freely rotating and fixing the rotary stator is provided, and a speed detector mounted directly or indirectly on the rotor and the drive device are connected via a control device. A variable speed induction motor characterized by: (2) The variable speed according to claim (1), wherein all or part of the plurality of rotor cores is made of a non-magnetic material, and the plurality of conductors are short-circuited and connected by a resistive material between the rotor cores. induction motor. (3) A rotational position detector for detecting the rotational position of the rotational stator at the time of starting the electric motor is mounted directly or indirectly in relation to the rotational stator, and the rotational position is detected. 2. The variable speed induction motor according to claim 1, wherein the variable speed induction motor is connected to the control device. (4) a voltage induced in a conductor of a rotor facing the rotary stator by controlling the voltage phase device by the drive device activated in response to an output signal of the control device;
Patent claim (1), wherein the control device is equipped with a phase difference setting device that can change the phase difference of the voltage induced in the rotor conductor facing the stator on the other side within an arbitrary range of 0° to 180°. Variable speed induction motor as described. (5) The variable speed induction motor according to claim (1), wherein an insulating material is attached to either or both of the conductor insertion holes drilled in the rotor core into which the plurality of conductors are inserted.