JPH01234094A - Variable-speed induction motor - Google Patents

Abstract

PURPOSE:To perform highly efficient operation even in the high speed region, by shortcircuiting rotor conductors through resistor materials, employing low resistance rotor conductors and insulating the rotor conductors from rotor core. CONSTITUTION:Insulation tubes 45... having same length are inserted into conductor insertion holes 43... of rotor cores 2, 3 made of silicon steel boards laminated with predetermined width. The insulation tubes 45... are formed of synthetic resin mixed with several % of granular material such as mica, rock wool or glass fiber into thin tubes. Resistors (r) are previously welded in ring through various means to the intermediate sections in longitudinal direction of a plurality of conductors 5.... When the insulation tubes 45... are mounted in such a manner, current leak from the conductor 5 to the rotor cores 2, 3 is prevented and the current flowing through the resistor materials (r) shortcircuited between a plurality of rotor cores 2, 3 is increased effectively, resulting in the improvement of torque characteristic and efficiency at start and random speed change rotation.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a variable speed induction motor, and more particularly to a variable speed induction motor having a single rotor, a plurality of stators and a voltage phase shifter. However, regarding variable speed induction motors with a so-called multiple stator configuration, in which the rotational speed of the rotor and the generated torque can be arbitrarily changed by adjusting the voltage phase shift device, in detail, A conductor is inserted into each of the plurality of conductor insertion holes, and a plurality of rotor cores are inserted into the same rotating shaft to form an integral rotor, and
'f2 In an electric motor that has unique torque characteristics by short-circuiting a plurality of conductors between the rotor cores of several revolutions, leakage current of the conductors is prevented, the current flowing through the resistive material is effectively increased, and the torque is increased. Concerning techniques for improving properties and efficiency.

[Prior art and its problems]

In general, the rotor of a general-purpose electric motor is formed by manually connecting multiple silicon steel-like plates whose end surfaces have been treated with a phosphoric acid insulating coating such as Carlite to form an integral rotor. Even if the conductor insertion hole into which the conductor is inserted is not insulated,
The current flowing through the conductor did not flow into the conductor insertion hole, so there was no need to take any special measures.

By the way, as an example of the conventional multiple stator electric b1,
For example, Japanese Unexamined Patent Publication No. 54-29005 (b) is known, and this technology has independent stator windings facing two-phase rotor cores installed on the same axis. Two sets of stators, a squirrel cage conductor that is commonly installed across the two sets of rotor cores and short-circuited at both ends via short-circuit rings, and a squirrel cage conductor between the rotor cores of 2114. It is equipped with a high-resistance element that shorts between the squirrel cage conductors at the center of the conductor, and windings are provided on independent stators facing the rotor core. It is a twin-core cage type operation in which the phase is shifted by 180 degrees and power is supplied in phase with each other during operation after startup.
This one changes the phase between the stator windings by 18 when starting.
By shifting the stator by 0°, the starting torque is increased and the starting characteristics are improved, and during operation, the phases of the stator windings are aligned 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 variable speed.

To describe the technology disclosed in Japanese Unexamined Patent Publication No. 54-29005 in more detail, when transitioning from startup to operation,
One example is to provide an intermediate step that momentarily connects the mutual power supply circuits of the stator windings in series for the purpose of alleviating shocks caused by drastic fluctuations in torque, but in this case,
This is limited to the times when the phase shift of the rotating magnetic field is 0° and 180°, and is not intended for speed change purposes. Moreover, by switching to series, the voltage applied to the stator is halved, so the torque is reduced to 1/4, and together with this, the speed change control becomes completely impossible, which is the summary disclosed in this publication. It is clear that this is not intended for speed change, and although it is said that it is an "intermediate step in which the stator windings are 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 there is no insulating material in 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 may flow back into the conductor. Since the flowing current leaks into the rotor core from the conductor insertion hole and is absorbed, there is a drawback that the starting torque efficiency is reduced.

Furthermore, in Japanese Patent Application Laid-Open No. 57-59457, one rotor center provided corresponding to each stator is fixed to one axis,
In addition to providing a high resistance starting winding on each rotor,
A low-resistance secondary conductor is connected to the two rotor cores to guide the driving winding, and when starting the motor, the electromagnetic phase input to one stator winding is controlled by switching the electromagnetic switch. It switches from 180 degrees to 120 degrees to 0 degrees and enters normal operation. During this switching operation, the heat generated in the starting winding is quite large and requires electrical insulation between it and the secondary conductor, so the conductivity of the heat decreases and the source of the generated heat is It is absorbed by the iron core or conducted to the end of the short-circuit ring and dissipated, causing a decrease in the leakage reactance of the secondary conductor, so considerable consideration must be given to heat dissipation and insulation of the starting winding. was there. In addition, this device is also not capable of arbitrarily changing the speed in the low speed region, and if the phase of one stator is changed to 150 by operating the electromagnetic switch,
If the rotation speed is compatible with 120 degrees or 120 degrees, 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 in that it could not be used as a practical electric motor that could be controlled to change speed at any speed over the entire rotational speed from 1 to the highest rotation speed.

[Purpose of the invention]

In order to improve the drawbacks of the above-mentioned prior art, the present applicant has published Japanese Patent Application Laid-Open Nos. 54-2900.5 and 57-594.
It has a unique torque characteristic that cannot be achieved by the sum of each of the parts described in Publication No. 57, and can shift over the entire speed range from the starting point to the maximum rotational speed, and has a rated current that is almost the same as the maximum rotational speed. A variable speed induction motor with excellent 1 to 1 torque characteristics and efficiency that appears when the motor is operated for 1 hour has been proposed in Publication No. 62-2585690@.

The present invention is intended to further improve the technology proposed by the above-mentioned applicant, and includes installing an insulating material in the rotor core through a crotch conductor insertion hole, one or both of the conductors, and rotating the conductor from the rotor core. Provides technology that prevents current from leaking to the child core, effectively increases the current flowing through the short-circuited resistive material between multiple rotor cores, and improves torque characteristics and efficiency during startup and arbitrary speed rotation. The purpose is to

In the present invention, the term "insulating material is attached to the conductor insertion hole and the conductor" is used, but "insulating material J" is not limited to the attachment of an insulating material to the conductor insertion hole or the conductor. The general term is not ``Rushino'', but includes various insulation treatments applied to the conductor insertion hole of the rotor core or the surface layer of the rotor core.

In the variable speed induction motor of the present invention, the rotor of the variable speed induction motor of the present invention has a rotor type of a Jintong squirrel cage type, a double squirrel cage type, and a deep groove cage type.

It is possible to insert a conductor into any type of special squirrel cage single winding type, etc., and connect the plurality of stators in parallel to the power supply, or connect multiple stators in series. It is possible to arbitrarily select and adopt such methods as connecting to a motor, or forming and covering a single-phase or three-phase motor.

[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 form an integrated structure. formed on a rotor, the plurality of conductors are short-circuited and connected between the plurality of rotor cores by a resistive material, and a plurality of stators are provided concentrically with and on the outer periphery of the plurality of rotor cores. In a motor, the plurality of conductors are inserted in a motor in which a voltage phase shifter is provided in relation to at least one stator of the plurality of stators arranged in parallel and facing each other and installed on the inner periphery of the machine frame. A means for solving the problem is provided by attaching an insulating material to each of the conductor insertion holes drilled in the rotor core and by making the rotor conductor a low resistance type.

Furthermore, as another configuration of the present invention, a plurality of conductors installed in each of a plurality of rotor cores attached to a rotating shaft at arbitrary intervals are connected to form an integral rotor. , the plurality of conductors are short-circuited between the plurality of rotor cores using a resistive material, and a plurality of stators are arranged concentrically with and on the outer periphery of the plurality of rotor cores.
In an electric motor provided with a voltage phase shifting device in relation to at least one stator among the plurality of stators arranged in parallel and installed on the inner periphery of the machine frame, a conductor drilled in the rotor core. A means for solving the problem is provided by attaching an insulating material to the plurality of conductors inserted into the insertion hole or the insertion hole, and by making the rotor conductor of a low resistance type.

In addition, the low resistance type of the rotor conductor in the present invention means that the torque curve gradually increases as the slip increases from 0 to 1. means a characteristic that decreases after reaching a peak.

[For production]

When the voltage is phase-shifted by the voltage phase shifter in relation to at least one stator of the plurality of stators, the plurality of conductors attached to one rotor core are connected to the plurality of conductors attached to the other rotor core. A phase shift occurs between the phase of the voltage induced during
By controlling the magnitude of the phase shift by increasing or decreasing the voltage induced in the rotor conductor by operating a voltage phase shifter, the rotational speed of the rotor can be arbitrarily changed.

In addition, multiple conductors inserted into multiple rotor cores,
Since a plurality of rotor cores are short-circuited via a resistive material, current inevitably flows from the conductor to the rotor core via the resistive material, especially at startup and during low rotational speed normal operation.
It is possible to produce a strong rotational torque.

In addition, since the conductor insertion hole is drilled in the rotor core or the conductor is covered with insulating material, even if the current flowing through the rotor conductor becomes large, especially at startup or during low speed counter-operation, the conductor No current leaks from the rotor core to the rotor core, and the current flowing from the conductors on one side and the other effectively flows through the resistor material and circulates, preventing conductor leakage current and improving torque characteristics and efficiency. Those who do so scream.

Furthermore, since the rotor conductor is of a low resistance type, the maximum speed of the rotor can be increased as will be detailed later, and efficiency during high-speed rotation can be avoided.

Embodiment An embodiment of the present invention will be explained with reference to FIGS. 1 to 10.

An embodiment of the present invention will be described with reference to FIGS. 1 to 4. Referring to FIGS. 1 and 3, reference numeral 1 indicates an induction motor, and the induction motor 1 is constructed as follows. Rotor cores 2.3 made of iron cores are mounted on a rotor shaft 4 with arbitrary intervals, and a non-magnetic core 9 is interposed between the rotor cores 2.3. An integral rotor 8 is installed in the rotor core 2.3 or connected in series with several rounds of conductors 5.
A plurality of conductors 5 connected in series are connected at both ends to a zero-circuit ring 6.7. In addition, a plurality of ventilation bodies 12 (12...
- A plurality of ventilation holes 13 of a suitable size are drilled orthogonally to the outer periphery of the rotor 8. The rotor 8 has a resistive material r... which conducts electricity when a current with an arbitrary vector difference flows through each of the plurality of conductors 5... in the non-magnetic core 9 between the rotor cores 2 and 3. The wires are short-circuited via a nichrome wire, carbon-containing steel, 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 with nuts 18 and 17.
Bearings 21 and 21 are integrally mated using ..., cooling spacers 19 and 20 are mounted on both sides of the rotor 8, and both ends of the rotor @4 are fitted into bearing discs 15 and 16. The rotor 4 is rotatably supported.

A winding 22.23 is installed on the outer side of the rotor core 2.3.
A first stator 24 and a second stator 25, which have been subjected to Slide bearings 2G and 27 are installed between the second stator 25 and the slide bearing 26
．． Stop ring 28 with IRH 27 on machine frame 14...
The gears 33A and 33B are fitted onto the negative side outer peripheral surfaces of the first stator 24 and the second stator 25. (
(See Figures 2 and 3) A driving gear 36 is pivotally attached to a pulse motor 35 fixed to the outer periphery of the machine frame 14, and the relay 1NI29 is rotated on a bearing stand 32 attached to the outer side of the machine frame 14. The shaft can be mounted freely, and the relay gears 30 are attached to both ends of the relay 1N129.
The driving gear 36 and the rotating gear 31 are inserted into the machine frame 14 through the opening 37.37 provided in the machine frame 14, and the rotating gear 31 is fixed to the second fixation. The gear j7-33 fitted to the child 25 is engaged with the drive gear 3.
6 is engaged with the gear 33A fitted on the first stator 24, and the width meter gear 30 is engaged with the interlocking gear 34 formed integrally with the drive gear 36, so that the first stator 24 and the 2
The stator 25 is configured to be rotatable concentrically with the rotor 8,
A voltage phase shifting device 38 is formed by the first stator 24 and the second stator 25 to form a variable speed induction motor. 39 is a pressure exhaust hole, and 40 is a plurality of ventilation holes bored in the bearing plate 15, 16.

Next, the rotor cores 2 and 3 shown in FIG. 9 will be explained.

The rotor 2,
3 and the non-magnetic core 9 are inserted and placed on top. To explain the rotor core 2.3 in more detail, the rotor core 2.3 is formed into an integral rotor 8 by hand-connecting a plurality of silicon steel plates 42, both sides of which have been treated with a V4 acid coating. be done.

The silicon steel plate 42... has a plurality of conductor insertion holes 43..., and the shorting ring 6 is inserted into the center shaft 44 at the bottom, and the silicon steel plate 42... has a predetermined thickness of °C.・Polymerize and superimpose. An insulating duplex 45 of the same length is inserted into each of the conductor insertion holes 43 of the rotor core 2.3 made of silicon steel plates overlapped to a predetermined width.

Insulating tube 45... is made of mica, asbestos, glass fiber I
Synthetic resin mixed with a few percent of particulate matter such as It (II resin,
(silicone resin, fluororesin, etc.) into a thin tube, and a resistance material r is welded in advance in a ring shape to the intermediate portion of the plurality of conductors 5 in the longitudinal direction by various means. , the non-magnetic core 9 is inserted into one of the two divided magnetic cores 9a, and the plurality of conductors 5 protruding from the non-magnetic core 9a are inserted into the conductor insertion holes 43 of the rotor core 2.
・Insert into the inner peripheral surface of the insulating tube 45 inserted into. Next, contrary to the above, the non-magnetic core 9b is inserted on the opposite side of the plurality of conductors 5... to which the resistive material r... is welded, and the conductors 5 and 5 protruding from the non-magnetic core 9b are inserted. An insulating tube 45... is inserted into each of the silicon steel plates 42... of a predetermined width through the insulating tube 45...
That is, the rotor core 3 and the short circuit ring 7 are inserted into the conductors 5 . The insulating tube 45... is the conductor insertion hole 43.
... may be glued to the above short circuit M6, 7,
Rotor core 2゜3, conductor 5..., non-magnetic core 9a
, 9b in turn, fixed the shorting ring 6 and rotated the other shorting ring 7 to skew the plurality of conductors, then both ends of each conductor 5... When the short-circuit rings 6, 7 and the conductor 5 are completely tightened, the rotor cores 2, 3 and the non-magnetic core 9 are formed into an integral rotor 8. Note that each of the above-mentioned work steps is mainly performed by automatic equipment. Additionally, if the conductor 5 inserted into the inner peripheral surface of the insulating tube 45 inserted into the rotor core 2゜3 is coated with an insulating resin paint, it will prevent the conductor 5 from becoming skewed. insulation tube 45
Even if the film of... is thin, the conductor insertion hole 43...
There is no need to worry about poor insulation between the conductor 5 and the conductor 5. In addition, in electric motors that have a small starting torque and are used only in high-speed rotation areas, the insulating tube 4
In some cases, the conductor 5 is used without using the insulating resin paint r1, but the surface of the conductor 5 coated with the insulating resin paint is In terms of insulation and durability, it is desirable to perform baking drying instead of air drying.

The insulation between the rotor conductor and the rotor core may be applied to all or only a portion of the joint between the rotor conductor and the rotor core. Additionally, an insulating oxide film treatment may be performed, and an alumite treatment may be performed when the conductor is made of aluminum.

The operation of the above configuration will be explained below.

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

When the amount of rotation of each second stator 25 with respect to the first stator 24 is set to zero, each stator 24.25
Since there is no phase shift in the magnetic flux of the rotating magnetic field generated in the motor, and no current flows through the resistor material r, as will be described in detail later, the motor has the same torque characteristics as a general induction motor.

Next, a case will be described in which the pulse motor 35 is operated to rotate the first stator 24 and the second stator 25 in opposite directions by a phase angle of θ. Voltage phase shifter 3
The magnetic flux φ1.8 of the rotating magnetic field created by the first stator 24 and the second stator 25. The phase of φ2 is shifted by θ, J5, so the voltage t': +, induced in the conductor 5 of the rotor 8 by the first stator 24 and the second stator 25, the phase of 62 is shifted by θ. ing. Now, using the voltage white 2 induced in the conductor 5 of the rotor 8 by the second stator 25 as a reference, the voltage white 2 is set as SE. Here, S is slip and [ is the induced voltage when slip is 1. Kotogi first stator 2
The voltage d1 induced in the conductor 5A by 4 is e+=3
Eε) becomes 0.

What is shown in Fig. 4 shows the rotation of the rotor 8 when the resistance material r... which short-circuits the conductors 5... of the plurality of items 1 is not attached to the non-magnetic core 9 portion. This shows the relationship with the active power P of the child input. When the voltage phase is θ=O°, the active power P is maximum, and when the voltage phase is 0°<θ<180°, it is much smaller. Here conductor 5...
Let R and L be the resistance and inductance of
It appears when /ω1−).

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

Next, let the respective resistances of the conductors 5 of the rotor 8 from the short-circuit rings 6, 7 to the connecting members be R+ and R2, the inductances Ll and L2, the angular frequency of the power source be ω, and each conductor 5 . . , the electrical equivalent circuit of the rotor 8 is as shown in FIG. 5, with symbols I+, 12 . I3 indicates the current flowing through each branch.

Next, when converting the circuit shown in Figure 5 into an equivalent circuit viewed from both stator 24 and 25 sides, it becomes as shown in Figure 6, R+=R
2, When L+=I-2 and θ-0°, 13=II-I
2=O, and no current flows through the resistor material r. This means that when θ-〇°, the torque T is equal to 1 when there is no r. Therefore, θ=0
°Doki will have the same torque characteristics as a conventional induction motor.

Next, when RI=R2, LI=L2 and θ=180°, I+=-12, 13=II-12-21+,
In a 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.

Due to the rotation of the rotor 8, the bearing discs 15 and 16 are
Outside air is sucked into the machine frame 14 by the cooling impeller 19.
1st by 20. Second stator 24°25, winding 22.2
The rotor cores 2, 3,
The conductor 5..., the resistive material r..., etc. are cooled 7J]L to ensure their respective functions function stably. Also, 1st. Second
The rotation of the fixing end 24.25 is performed by turning the pulse motor 35 in the opposite direction tIC with a switch, but the pulse motor 3
The present invention is not limited to 5, but can also be used for other forward and reverse Tanabata, and any drive device such as a servo machine groove using a gas or liquid cylinder can be used. In some cases, only one of the stator 24 and the second stator 25 is rotated. Then, in conjunction with the operation of the stator rotation drive device, the rotation of the stator is opened or locked depending on the patient's operation.

When the windings 22 and 23 of the first stator 24 and the second stator 25 are connected in parallel to a commercial three-phase power supply, the windings 22 and 23 of the first stator 24 and the second stator 25 are The voltages input to .23 are the same, the voltages induced from each of the stators 24, 25 to the conductors 5 of the rotor 8 are the same, and the phases of the voltages differ by Pθ, and the voltages induced on the conductors 5... of the rotor 8 are the same.・The current flowing through the resistive material r... is (1/2)
The current is approximately proportional to X (flash ff induced in the rotor conductor from each of the first and second stators)÷(resistance value of the resistance material r...). However, the conductor 5 of the rotor 8
In addition to the 7δ flow flowing through the resistance material r...,
．． A current approximately proportional to (sum voltage induced in the rotor conductor of the second stator)÷(rotor conductor impedance) flows in a superimposed manner. (The above sum voltage is such that Pθ-π is zero and Pθ-
(The impedance of the rotor conductor is determined by the resistance of the conductor and the secondary leakage reactance, so it differs depending on the slippage.) Therefore, the impedance of the rotor conductor 5 and
For the size of the current flowing through multiple conductors 5...
・The ratio of the current flowing through the resistive material r... between P
Even when θ is constant, there is slippage and primary resistance (even when it is direct), j-mix slippage and torque characteristics with Pθ constant are when the secondary insertion resistance of a general winding type 'fb 4 motor is constant. The characteristic is a mixture of the characteristic f[ of , and the characteristic when the primary voltage of a general induction motor is controlled.

In addition, due to the size of the current flowing to the rotor conductor from each of the rotary stator and the second stator, which have windings connected in series, a short circuit occurs between multiple conductors via a resistive material r... The ratio of the current that flows is determined by the ratio of Pθ (P - number of pole pairs, θ - phase angle), regardless of the resistance value and slip of the resistive material r... (The above ratio is determined when Pθ - π is Maximum CPθ
-0 = zero) If Pθ is constant, the slip and torque characteristics will be the same as when the secondary insertion resistance of a general wound induction motor is constant, and as Pθ becomes small, the rotor conductor The ratio of flowing current becomes small, and reducing Pθ is a general rule of y! - This has the same effect as reducing the secondary insertion resistance of a linear induction motor. When the rated current is passed through both stators, even if the phase difference θ is arbitrarily changed, the rated current and rated torque characteristics of the maximum speed can be determined depending on the selection of the slip value and the design of the resistance value of the connecting material. It is possible to have almost the same effect in each of the medium ranges. In addition, even if the windings of the rotating stator and the second stator are connected in series, if a connecting material is provided between the conductors and there is no short circuit, if there is a phase difference, the rotor conductors will is in a state where almost no current flows, making it more efficient and more efficient than connecting both stator windings in parallel to the power supply.
This causes a phenomenon in which the torque decreases significantly.

Furthermore, Fig. 7 is a graph showing the relationship between slip and torque in an embodiment of the present defense, that is, in a case where the rotor conductor is of a low resistance type. Especially during high-speed operation, slip loss is small, allowing for highly efficient operation.

FIG. 8 is a graph showing the relationship between slip and torque when the rotor conductor has a high resistance type. As the slip S goes from 0 to 1, the torque always tends to increase. in this case,
The tension at the maximum rotational speed with respect to the load torque R is Sl, and the slippage is large and the efficiency is poor in the high speed range.

When the plurality of stators are connected in parallel in q, the ratio of the current flowing through the rotor conductor and the current flowing through the resistive material due to the phase difference θ is independent of slip compared to when they are connected in series. The current flowing between the plurality of conductors 5 through the resistive material r is (1/2) x (rotating from each of the first and second stators). The current is approximately proportional to (difference in voltage induced in the child conductor)÷(resistance value of the resistor material r), and the control range becomes narrow.

However, even when the stators are connected in parallel, by appropriately selecting the resistance value of the resistor material, it can be applied to loads with so-called reduced torque characteristics such as fans and pumps. In addition, if the stator windings are connected in parallel, it is easy to connect them in series by providing switches, which makes it easy to diversify the torque characteristics and expand the high-speed range. be able to.

The low-resistance type of rotor conductor only becomes effective when it is technically combined with a resistive material that short-circuits the rotor conductor between the rotor cores, and if there is no resistive material, the rotor conductor The relationship between slip and torque for the low resistance type is shown in Figure 4, and there are too many unstable regions during gear shifting, making it difficult to apply to loads with reduced torque characteristics such as fans and pumps. Become. If there is a space or a non-magnetic material between the front rotor cores, leakage reactance will be reduced, resulting in a variable speed induction motor with even higher efficiency.

If the space between the rotor cores is non-magnetic, it not only improves torque and efficiency by reducing leakage reactance as mentioned above, but also prevents the strength of the rotor from decreasing due to the effects of heat and centrifugal force generated by the resistive material. do.

The voltage phasing device is not limited to the above embodiment, and the voltage induced in the conductor portion of the rotor that faces one of the plurality of stators and the voltage that faces the other stator. It is possible to arbitrarily select and implement a device that generates a phase difference between the voltage induced in the corresponding conductor portion of the rotor.

The voltage phasing device is connected to a winding wound around at least one stator of the plurality of stators. A type formed by a wire connection changeover switch, and a type formed by using the voltage phase device as an induced voltage regulator.Furthermore, each of the plurality of stators is provided with a winding forming a number of poles of a plurality of seconds. A pole number changeover switch may be connected to the terminals of the windings, and the connection of the windings wound around each of the plurality of stators can be freely switched to either delta connection or star connection. It may also be used in conjunction with providing diversity in torque characteristics.

Furthermore, the variable speed induction motor of the present invention can also be used as an induction generator, and if a turbine or the like is directly connected to the rotor shaft 4 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 an expensive synchronization device. Then, a switch is provided that connects the rotor shaft to the rotor shaft and switches the two phases at the input end of the stator winding, and if the switch allows the rotor shaft to freely rotate forward or reverse, the switch It can also be used as an electric brake by operating with a voltage phase device, and by controlling the rotation speed by the voltage level H, the braking force of the rotating shaft connected to the rotor shaft can be efficiently adjusted. Wear.

In addition, when starting the electric motor of the present invention, the phase difference is set to 180° or an appropriate difference to suppress the starting power source, and the motor is started with high torque characteristics, and when it is operated, the phase difference is set to 0° or small. Needless to say, it can be used as a modified electric motor.

Furthermore, a motor in which the phase difference can be arbitrarily set in the range from 0° to 180° allows the torque characteristics to be diversified to the maximum and the high speed range to be widened to the maximum.

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

The electromotive force generated in the conductor is expressed as e=vF3Q (B...
・Magnetic flux density, Q... Length of rotor conductor, ■... Difference between the speed of the rotating magnetic field and the speed of the rotor). If the insulation between the conductor and the silicon steel plates 42a to 42f is perfect at points A to F of the conductor 5, the sum of the electromotive force e generated in the conductor is
The sum total of points A to F) becomes a line indicated by P. The electromotive force P from point Δ to point F of the conductor 5 is from point A to F of the conductor 5.
The direction increases in proportion to the point, but the conductor 5 and silicon! ! root 4
If the conductor insertion hole 43 of No. 2 is not provided with the same insulation treatment, the current will flow from point F of the conductor 5, which greatly increases the electromotive force P, to the point F of the silicon steel plate 42. When leakage occurs, the current P flowing from point F of the conductor 5 to the resistive material r decreases, and the rotational torque of the rotor decreases significantly, resulting in a corresponding decrease in efficiency.

However, in the present invention, one or both of the conductor insertion holes 43... of the silicon m-plates 42... and the conductors 5... are insulated, so that the silicon mtf 42...・It has a great effect of improving torque characteristics and efficiency without leaking.

In one configuration of the present invention, a space or a non-magnetic material is provided between the rotor cores, so that leakage reactance can be reduced and torque and efficiency can be increased. Furthermore, a non-magnetic material can prevent the strength of the rotor from decreasing due to heat generation of the resistive material and centrifugal nozzles.

Effects of the Invention According to the present invention as explained above,? ! Windings wound around two or more stators are connected in parallel, a voltage phase shifter is connected in relation to at least one of the stators, and a voltage phase shifter is connected between the rotor cores that do not face the stator. Since each of the conductors is short-circuited through the resistor (A), it is easy to operate by simply operating the voltage phase shifter to create a phase shift in the flux of the rotating magnetic field generated in the stator. , the rotation speed of the rotor can be changed arbitrarily.

In addition, the effects of the combination of short-circuiting each rotor conductor via a resistance material, making the rotor conductor a low resistance type, and insulating between the rotor conductor and the rotor core are This made it possible to increase the rotational speed up to 100 degrees and achieve highly efficient operation.

Therefore, it is possible not only to perform smooth starting control that adapts to the load, but also to arbitrarily control starting and shifting according to arbitrary characteristics specified for the load, and it is suitable for power sources that frequently repeat starting, stopping, and shifting. It has a remarkable effect.

[Brief explanation of the drawing]

FIGS. 1 to 10 are illustrations of embodiments of the present invention. Figure 1 is a side sectional view of the induction motor, Figure 2 is a side view showing the stator rotation mechanism, Figure 3 is a partially cutaway side view showing the stator rotation mechanism, and Figure 4 is a side view showing the stator rotation mechanism. Figure 1 shows the relationship between rotor slip and active power, Figure 5 is an electrical equivalent circuit diagram of the rotor, and Figure 6 shows the relationship between rotor slip and active power.
The figure is an electrical equivalent circuit diagram seen from the stator side, and Figure 7 is a torque curve when the rotor conductor according to the present invention is a low resistance type.
Figure 8 shows the torque curve when the rotor conductor is of high resistance type, Figure 9 shows an example in which an insulating tube is installed in the conductor insertion hole of the rotor core, and Figure 10 explains the electromotive force flowing in the conductor. It is a diagram. 1... Inviting electric motor 2, 3... Rotor core 4
...Rotor 11@5...Conductor 6.7...Short-circuit ring 8,8A-8C...Rotor 9a, 9b...Non-magnetic core 10.11...Side part 12. ...Ventilation trunk 13...Vent hole '14
...Shaft 15, 16...Bearing plate 17.
・・Connecting rod 18・・Nut 19.20・・
・Cooling impeller 21...Bearing 22.23...Winding
24...First stator 25...Second stator
26.27...Zuberi shaft 28...Stop ring
29...1st year of middle school! ! Shaft 30... Relay gear 31
...Rotation tooth width 32...Bearing stand 33A,
33B... Gear A7-34... Bolt 35
... Pulse motor 36 ... Drive gear 37
... Opening 38 ... Voltage phase shifter 39 ... Ventilation hole 40 ... Ventilation hole 41 ... Jig stand 42
...Silicon steel plate 43...Conductor insertion hole 44...
・Center @ 45...Insulating tube patent applicant Satake Seisakusho Co., Ltd.S=1]Military degree 5RO ωL Fig. 4 Fig. 5 Fig. a Fig. + + T To o 5 Torque - Shape S Torque T Shape 1・S 8 Figure 9 A-F - Electromotive force per length 42a-421--1 Kei 1 Steel plate 5-1 Thick plate procedural amendment (voluntary) July 5, 1988

Claims (3)

[Claims] (1) A plurality of rotor conductors are installed in a continuous manner on a plurality of rotor cores that are mounted on the same rotating shaft at regular intervals, and the rotor conductors are connected to the plurality of rotor cores. The rotor has an integral rotor short-circuited between the rotor cores by a resistive material, and each stator core facing each rotor core of the rotor, and is coaxially disposed around the rotor. a stator from a plurality of countries, and a voltage induced in a conductor portion of the rotor facing one of the plurality of stators and a corresponding conductor of the rotor facing the other stator; The variable speed induction motor has a voltage phase shift device inside and outside of the motor frame that creates a phase difference between the voltage induced in the part, and the rotor core has holes in all the rotor cores into which the plurality of conductors are inserted. A variable speed induction motor characterized in that an insulating material is attached to each of the provided conductor insertion holes or conductors, and the rotor conductor is of a low resistance type. (2) The variable speed induction motor according to claim (1), wherein a space or a non-magnetic material is provided between the rotor cores. (3) At least one of the plurality of stators is configured such that the phase shift of the voltage applied between the plurality of stators can be set to an arbitrary phase shift within the range of 0° to 180°. 3. The variable speed induction motor according to claim 1, wherein said voltage phase shifting device includes a stator rotatably formed concentrically with said rotor.