JPH01107635A - Cooling device for variable speed induction motor - Google Patents

Abstract

PURPOSE:To cool a resistance material and dissipate its heat effectively by forming, in a ventilation barrel, a space part defined between a plurality of stators, and between rotor cores, and by a machine frame, and by causing a blowing apparatus to communicate with a blower port or exhaust port opened in said machine frame. CONSTITUTION:Rotor cores 2, 3 are fitted to a rotor shaft 4 and a non-magnetic material core is interposed between said rotor cores 2, 3. Respective conductors 5 furnished at said rotor cores 2, 3 are connected in series and both ends thereof are connected by short-circuit rings 6, 7. Also, the rotor cores 2, 3 and non-magnetic material cores are provided with a plurality of ventilation barrels for connecting the rotor cores 2, 3 and non-magnetic cores with both ends 10, 11 of a rotor 8. A space part 66 defined between said rotor cores 2, 3, and by a turning stator 31 fitted to a sliding bearing 26, by a second stator 25 fixed at a ventilation fixing ring 27A and a stator ring 27B, and by a machine frame 14 is formed in a ventilation barrel 67. A blower port 68 is opened in one side part of said machine frame 14 to communicate with said ventilation barrel 67, and an exhaust port 69 is opened in the machine frame 14 facing the blower port 68. A blowing apparatus 73 is immovably provided in the machine frame 14.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a motorized dawn that can set a wide range of speed control ranges and steplessly. Alternatively, in the non-magnetic part, multiple conductors installed on each of multiple rotors are short-circuited via a resistive material, and the non-magnetic material or the resistive material is ventilated to cool and dissipate heat. The present invention relates to a cooling device for effectively increasing efficiency and improving the durability of non-magnetic materials or resistive materials.

[Prior art and its problems]

Conventionally, when starting a squirrel cage induction motor that is commonly used, star-delta starting, reactor starting, starting compensator starting, etc. are known as means for suppressing the starting current. However, the rotation speed can only be suppressed in stages, and the starting current cannot be controlled by appropriately changing the suppression value set in the starting device.

In addition, in wire-wound electric motors, it is possible to change the resistance value of the secondary resistor and perform the sub-section steplessly from the time of starting to the desired rotational speed relatively easily. There are problems in that the structure is expensive and the control operation is troublesome, so it cannot be used in squirrel cage induction motors.

To address the above problems, for example,
Japanese Patent No. 86807 proposes an asynchronous electric motor having a stator with polyphase windings and a squirrel-cage rotor, consisting of a conduction bar, a short-circuit end ring and a ferromagnetic metal. The stator consists of first and second winding sections, which sections are coaxially arranged adjacent to each other and to different parts of the rotor and can be supplied with an alternating current of the same frequency; Also, an asynchronous electric motor provided with means for varying the electromotive force induced in the rotor winding by the second winding section, which is capable of changing the electromotive force between the two stator sections by mechanical or electrical means. Although it is possible to change the rotation speed by setting a phase difference, the torque is small except when the phase angle between the two stator sections is in the same phase, and the problem is that the operation stops immediately when a load is applied. This was completely unsuitable for practical use, and left the problem unsolved that it could not be used as a power source that frequently starts and stops when a load is connected.

Furthermore, the technology disclosed in Japanese Patent Application Laid-Open No. 54-19005 has two sets of stators each having independent stator windings facing two sets of rotor cores installed on the same axis. and 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 the center of the squirrel-cage conductor between the two sets of rotor cores. It is equipped with a high-resistance element that shorts between the squirrel cage conductors at certain points, and has windings on independent stators facing the rotor core, and when starting, the phase between the stator windings is set to 1.
This is a twin iron core squirrel cage electric motor that supplies power by shifting the stator windings by 80 degrees and matching the phase during operation after startup, but this motor increases the starting torque by shifting the phase between the stator windings by 180 degrees at the time of startup. This feature improves starting characteristics, and during operation, the phases of the stator windings are aligned with each other, allowing operation 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,
One example is to provide an intermediate step that instantly connects the mutual power supply circuits of the stator windings in series for the purpose of alleviating the shock caused by sudden fluctuations in torque.
The phase shift of the rotating magnetic field is limited to both 0° and 18°, 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 this makes gear change control completely impossible, which is the main point disclosed in this publication. It is clear from the fact that the purpose is not to change speeds, and although it is said that there is an intermediate step in which the stator windings are switched between series connection and parallel connection with respect to the power supply circuit, this series connection is not used for the purpose of speed changes at all. It is just a useless connection, it cannot control speed change to any speed, and it does not have a means to ventilate the central short-circuit ring of the high resistance element, so if the starting load is to be large, it is difficult to start. Unresolved problems include damage to the high-resistance element due to inability to start due to lack of capacity, and inability to prevent heat generation by ventilating the high-resistance element for a specified operating time.

In Japanese Patent Publication No. 27-4357, the stator is divided into two sets, a fixed stator and a movable stator, each with the same winding and connected to the same power source, and the rotor is also divided into two sets, and the rotor is divided into two sets, a fixed stator and a movable stator. The conductors are connected as separate conductors with a wide center section, and both ends are connected with short-circuit rings. Cooling ventilation holes are provided in the machine frame, and the center section of the secondary conductor is made separate to achieve a cooling effect. A configuration to increase the size is disclosed, but this technology also has
The windings of both stators are not connected in series, and the secondary conductors in the center are not short-circuited using a high resistance element, so it corresponds to the operating characteristics of the load at startup and in the low/medium speed range. However, it was not possible to produce sufficient output.

[Purpose of the invention]

The present invention is aimed at improving and overcoming the drawbacks of the above-mentioned prior art, and is directed to the above-mentioned Japanese Patent Laid-Open Nos. 49-86807 and 54-2.
It has a unique torque characteristic that cannot be achieved by the sum of the two methods disclosed in Japanese Patent Publication No. 9005 and Japanese Patent Publication No. 27-4357. , it can be started with any torque, and has excellent torque characteristics and efficiency that appear by applying a constant test current that is almost the same as that at the maximum rotation speed over the entire speed range from the starting point to the maximum rotation speed. In a variable speed induction motor,
A non-magnetic material formed between multiple conductors or a resistive material formed by short-circuiting multiple conductors is ventilated to cool and radiate heat, thereby effectively increasing electric rotation efficiency. The purpose of the present invention is to provide a cooling device for improving the durability of.

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

It can be applied to any type of special squirrel-cage rotor with 9 windings, etc., and the conductors used in the explanation of the present invention refer to conductors installed in the squirrel-cage rotor core and conductors wound around the wound rotor core. It is a general term for each of the windings installed in the winding, and connecting the plurality of stators in parallel to the power supply, or connecting the plurality of stators in series can be arbitrarily selected. It can be adopted by

[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 by a resistive material in a space formed between the plurality of rotor cores or a non-magnetic material portion formed in the rotor core and installed in each of the rotor cores. A plurality of stators are arranged in parallel and facing each other concentrically with the child core and on its outer periphery, and a voltage is applied to at least one stator among the plurality of stators installed on the inner periphery of the machine frame. In the electric motor provided with a transfer device, a space formed between the plurality of stators, between the rotor cores, and the machine frame is formed in a ventilation shell, and the resistive material is cooled and heat radiated by outside air. An air outlet is provided in the machine frame to communicate with the ventilation shell so as to exhaust the air outside the machine frame, an air outlet is provided in the machine frame facing the air outlet, and the air outlet or the air exhaust port is provided. A configuration in which an air blower is connected to either of the two is used as a means to solve the above-mentioned problems.

[For production]

In the present invention, since a voltage phase shift device is provided in connection with the rIA to at least one stator among the plurality of stators, the phase of the voltage induced between the plurality of stators and one rotor core can be changed. There is a phase shift in the phase of the voltage induced between the multiple conductors wound around the rotor and the other multiple conductor, and the voltage induced in the rotor conductor changes according to the phase shift. The rotational speed of the rotor can be arbitrarily changed by increasing or decreasing the voltage induced in the rotor conductor.

In addition, since the plurality of conductors wound around the plurality of rotor cores are short-circuited through the resistive material between the plurality of rotor cores, the plurality of conductors are short-circuited through the resistive material, especially at startup and during low rotational speed operation. Electric current inevitably flows from the plurality of conductors provided in the rotor core through the resistive material, making it possible to generate strong rotational torque.

By the way, from startup to maximum speed operation, the time required is extremely short and there is no problem, but especially when operating at medium and low speeds, non-magnetic or resistive materials Heat generation increases, and due to the heat generation effect, the electric rotation efficiency and the durability of the non-magnetic material or resistance material are significantly reduced. In the present invention, the air outside the machine frame is introduced into the ventilation shell by the blower, the non-magnetic material or the resistive material is cooled and the heat is radiated, and the exhaust air is discharged from the ventilation shell to the outside of the machine frame. The action of the resistive material, in which multiple conductors installed in the child core are short-circuited and connected between multiple rotor cores, works accurately without fluctuations, allowing the motor to operate at variable speeds in any rotational range from low speed to high speed. be able to operate normally and efficiently.

(Example) Embodiments of the present invention will be described based on FIGS. 1 to 22.

A first embodiment of the present invention will be explained with reference to FIGS. 1 to 3.

Reference numeral 1 shown in FIG. 1 is a variable speed induction motor according to the present invention, and the induction motor ta1 has the following configuration.

Rotor cores 2 and 3 made of iron cores are mounted on a rotor shaft 4 with an arbitrary interval between them, and a non-magnetic core 9 is interposed between the rotor cores 2 and 3. Each of the plurality of conductors 5 installed in the rotor cores 2 and 3 is connected in series to form an integral rotor 8, and the plurality of conductors 5 connected in series are connected in series to form an integral rotor 8.
. . , both ends of which are connected by a short circuit ring 6.7. Further, a plurality of ventilation cylinders 12 . . . are provided in the rotor cores 2 and 3 and the non-magnetic core 9, which communicate with both side portions 10, 11 of the rotor 8. The plurality of conductors 5... installed on 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. ,
The carbon-containing steel 2 is short-circuited and connected via a resistive material r such as conductive ceramic, and the non-magnetic core 9 is made of a plurality of non-magnetic materials such as aluminum, ceramic, resin, rubber, and glass. A plurality of cooling effect bodies 13 consisting of the above are attached, and the cooling effect bodies 13 are formed on the cooling blade vehicle body 13A. As shown in FIG. 2, the cooling body 13 can be formed by forming the non-magnetic core 9 into a cooling shape using the arbitrary non-magnetic material, or by forming the cooling body 13 into various shapes. A plurality of acting bodies 13 may be mounted on one or both inner surfaces of the rotor cores 2, 3, and
In some cases, an arbitrary type of cooling body is attached to the rotor shaft 4 in the space. (See Figures 1 and 2) Cylindrical machine frame 1
The bearing discs 15 and 16 provided on both sides of the rotor 8 are integrally assembled by connecting rods 17 with bolts at both ends and nuts 18, and cooling blades are installed on both sides of the rotor 8. Car 19.
20, and connect both ends of the rotor shaft 4 to bearing discs 15 and 16.
The rotor 4 is rotatably supported by bearings 21 and 21 fitted in the rotor.

Winding 2 concentrically with respect to the rotor core 2.3 and on its outer part
The rotating stator 31 and the second stator 25 subjected to 2.23 are arranged facing each other in parallel, and a sliding bearing 26 is installed between the machine frame 14 and the rotating stator 31, and the sliding bearing 26 is installed between the machine frame 14 and the rotating stator 31. The left and right movement is fixed by the stop ring 28 fitted in 14,
The machine frame 14 and the second stator 25 are fixed by a ventilation fixing ring 27A and a fixing ring 27B, which are provided with ventilation windows at several locations. A gear 33 is connected to the outer peripheral surface of one side of the rotating stator 31.
A drive device 29 is fixed to the outer periphery of the machine frame 14.
A driving gear 36 is pivotally attached to a small motor 35 for forward and reverse rotation, and a plurality of ventilation holes 39 are bored in the outer periphery of the machine frame 14, and a plurality of ventilation holes 40 are formed in the bearings 115 and 16. ...
It is perforated.

A space 66 is formed between the rotor core 2.3, the rotating stator 31 mounted on the sliding bearing 26, the second stator 251 fixed to the ventilation fixing ring 27A and the fixing ring 27B, and the machine frame 14. A ventilation port 68 is opened in one side of the machine frame 1 to communicate with the ventilation shell 67, and a ventilation port 69 is opened in the machine frame 14 facing the ventilation 068.

A motor 72 which is pivoted to a windmill 71 is attached to a blower body 70 to form a blower device 73, and the motor 72 is formed to be able to freely rotate in forward and reverse directions. In some cases, it is formed so that the speed can be changed freely. The blower device 73 is fixed to the machine frame 14, and the blower device 73
The air suction part 74A is connected to the air exhaust port 69 and communicated with the air blowing cylinder 67, and the air blowing cylinder 70 is formed with an air exhaust part 74B. Drive gear 3 partially inserted into machine frame 14 through opening 37
6 is engaged with a gear 33 fitted to a rotation stator 31, and a rotation mechanism 30 consisting of a small motor 35 equipped with a switch, a gear 33, and a drive gear 36, which constitutes a drive device 29, is engaged. The rotary stator 31 is connected to the rotary stator 31 so that the rotary stator 31 is rotatable, and the rotary stator 31 is rotatable in relation to the second stator 25 fixed to the machine frame 14. It is shaped like a phase wave M100.

A magnetic sensor 32 is attached to the outer peripheral surface of the rotating stator 31,
A plurality of magnetic detectors 34 with different terminal diameters for detecting magnetism in relation to the magnetic sensor 32 are embedded in a non-magnetic plate 41, and the non-magnetic plate 41 is attached to the inner peripheral surface of the machine frame 14. The magnetic sensor 32 and the magnetic sensing body 34 form a rotational position detector 42, and the magnetic sensor 32 is
Display V where the rotational position of the rotational stator 31 set for each magnetic detection body 34... is input! It is electrically connected to f143. Reference numeral 38 denotes a solenoid for controlling the entry and exit of a protruding piece.The solenoid 38 is attached to the machine frame 14, and its protruding piece is freely engaged with a gear 33 fitted to a rotary stator 31. A speed detector 44 such as a tough generator is mounted on the shaft 4, and the speed detector needle 44 is connected to a speed indicator 45.

Next, based on FIG. 3, the rotary stator 31 and the second stator 2 are
The connection of the windings 22 and 23 wound around each of the windings 22 and 23 will be explained. The rotating stator 31° and the windings 22 and 23 each having a star connection are connected in series to each of the second stator 25. That is, terminals A, B, and C of the winding 22 of the rotary identifier 31
are connected to commercial three-phase power supplies A, B, and C, and the winding 22
terminals a, b, c of the second stator 25
, B, and C, and the terminals a, b, and c of the winding 23 are short-circuited and connected.

The operation of the above configuration will be explained below.

When the windings 22.23 are energized from a commercial three-phase power source, a rotating magnetic field is generated in the rotating stator 31.25, voltage is induced in the rotor 8, and current flows through the conductors 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 r.
Since no current flows through the motor, it has the same torque characteristics 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 electrical 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, and therefore the phase of the voltages 61, 62 induced in the conductors 5 of the rotor 8 by the rotary stator 31 and the second stator 25 is shifted by θ. Now, using the voltage white induced by the second stator 25 in the conductor 5 of the rotor 8 as a reference, the voltage is set to 62 = SE. Here, S is slip and E is the induced voltage when slip is 1. At this point, the voltage white induced in the conductor 5A by the first stator 24 is 6t=SEεJO.

(Induced voltage when E-slip 1) What is shown in Fig. 4 is the case where the resistive material r... that short-circuits the plurality of conductors 5... is not installed in the non-magnetic core 9 section. This shows the relationship between the slip S of the rotor 8 and the active power P input to the rotor. When the voltage phase is θ = 0°, the active power P is maximum, and when the voltage phase is 0° and θ < 180°, it is the maximum. It will be smaller than. Here, if the resistance and inductance of the conductor 5 are R and L, and the angular frequency of the power source is ω, then the maximum active power P is S = (R/
It appears when ωL).

Since the active power P is proportional to the driving torque of the induction machine 1, the voltage induced in the rotor 8 can be increased 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 R1 and R2 be the respective resistances from the short-circuit rings 6 and 7 of the conductor 5 of the rotor 8 to the connecting member, let the inductance be Ll and L2, and let the angular frequency of ff1l be ω,
The resistance of the resistive material short-circuiting each conductor 5 is r
Then, the electrical equivalent circuit of the rotor 8 is as shown in FIG. 6, with symbols I+, 12 . I3 indicates the current flowing through each branch.

Next, when converting the circuit shown in Fig. 5 into an equivalent circuit seen from both stators 31 and 25 side, it becomes as shown in Fig. 6, and R1=R
When 2,1l=L2 and θ=o', 13=I+-1
2 = O, and no current flows through the resistor material. This means that when θ = 0°, the torque T is equal to the value when there is no r. Therefore, θ = 0°
When , it will have the same torque characteristics as a conventional induction motor.

Next, when RI=R2, LI=12 and θ=180°, I+=-I2, 13=II-12-21+,
In a conventional induction motor, the resistance of the rotor conductor is RI=R
If 2=R, the result is the same as if R were increased to R+2r.

As the rotor 8 rotates, outside air is sucked into the machine frame 14 by the cooling 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
21 rotor core 2. The conductor 5... etc. are cooled and the exhaust hole 3
9A... to the outside of the machine frame 14, and the cooling impeller 2
At 0! The surplus air sucked in V inside 19 flows into the ventilation barrel 12..., and the rotor core, non-magnetic core 99 and rotor core 3 are cooled, and the air sucked from the bearing disk 16 and the are merged into 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...

Next, FIG.
This will be explained with reference to FIG.

Since the windings 22 and 23 are connected in series, current flows between the windings 22 and 23 from the commercial 3-phase power supply.
．． 23 or both stators 31.
25, the magnitude of the current flowing through each of the windings 22 and 23 is the same regardless of the difference in the size of the capacitance of the rotary stator 31 and the second stator 25. The magnitude of the current induced in the conductor 5 of the child 8 becomes equal, and the rotating stator 31... Depending on the rotation difference with respect to the second stator 25, that is, the phase shift that occurs in the magnetic flux of the rotating magnetic field, the magnitude of the current flowing from each of the stators 31 and 25 to the conductor 5 of the rotor 8 increases. The effect of generating a forcing force such that both stators 31.
A force is generated in that the vector difference current caused by the phase difference between the voltages between the conductors 5 inevitably flows through the resistive material r that connects each of the plurality of conductors 5. Due to the synergistic effect, as shown in the slip and torque characteristics shown in Figure 7, it is possible to improve efficiency and generate large torque in each speed range, and even when a load is connected, it is possible to start up in each speed range. It can be used to suit the starting characteristics of the load to achieve smooth startup, or startup with high output, etc. ()
This makes it ideal for power sources that are frequently started and stopped. As mentioned above, the speed of the rotor 8 is controlled by controlling the phase shift by the rotary stator 31, and the conductors 5 of the rotor 8...
・The rotor 8 is controlled only by increasing or decreasing the current flowing through the rotor 8.
The rotation speed can be changed arbitrarily.

Note that the rotating stator 31 has windings 22 and 23 connected in series.
and the second stator 25 to the conductor 5 of the rotor 8, respectively.
・For the magnitude of the current flowing in ・, multiple conductors 5...
The ratio of the current that flows in a short circuit through the resistive material r... is determined by the value 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 maximum when Pθ = π and becomes zero when Pθ = 0.) If Pθ is constant, the same slip as when the secondary insertion resistance of a general wound induction motor is constant. When it comes to torque characteristics, when Pθ becomes small, the ratio of current flowing through the conductor 5 of the rotor 8 becomes small, and reducing Pθ reduces the secondary insertion resistance of a general wound induction motor. It will have the same effect as . and both stators 31
．． 25, even if the phase difference θ is arbitrarily changed, depending on the selection of the slip value and the design of the resistance value of the connecting material, the rated current at the maximum speed and the rated (-lux characteristic) can be changed, respectively. Almost the same effect can be achieved even in the shift range of .

In addition, the windings 22.2 of the rotary stator 31 and the second stator 25
3 are connected in series, if a connecting material is provided between the conductors 5 and there is no short circuit, almost no current will flow through the rotor conductors 5 when there is a phase difference. This results in a phenomenon in which efficiency and torque are significantly lower than when the windings 22, 23 of both stators 31, 25 are connected to the power source in parallel.

In contrast to the above, the winding 2 of the rotary stator 31 and the second stator 25
2.23 are connected in parallel to a commercial three-phase power supply, the windings 22.
23 are equal, the voltages induced from both stators 31.
The current flowing through the resistance material r... which serves as a connecting material between... is (1/2) x (differential voltage induced in the rotor conductor from each of the first and second stators) ÷ ( Resistance material r・
The current is approximately proportional to the resistance value of... However, in addition to the current flowing through the resistor material r... in the conductor 5 of the rotor 8, it is approximately proportional to (sum voltage induced in the rotor conductors of both stators) ÷ (impedance of the rotor conductor). The current flows in a heavily fortified manner. (The above sum voltage is maximum when Pθ=π is zero and Pθ=0, 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 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 conductor 5 is determined by the slip and resistance value even if Pθ is constant. Differently, the slip and torque characteristics when Pθ is constant are the characteristics when the secondary insertion resistance of a general wound induction motor is constant, and the characteristics when the primary voltage of a general induction motor is controlled. The mixed characteristics are shown in FIG.
The range of speed control becomes narrower than the characteristic when connected in series.

By the way, when the variable speed induction motor 1 starts operating (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,
If the power is turned on without considering the starting characteristics of the load connected to the rotor shaft 4, the electric motor 1 may not be able to start or may not start properly if a load that requires a large starting torque is connected. Conventionally, securing sufficient capacity for equipment was a problem, but the features of the present invention are that the starting equipment is downsized, and it has a configuration that allows smooth starting and variable speed. Before starting the operation of the electric motor 1, the magnetic sensor 32 of the rotation position detector 32 detects where the rotation surface orientation 2 of the rotation stator 31 is located. For example, the rotation position of the rotation stator 31 can be detected by the magnetic detection body 34C.
The magnetic sensor 32 detects and informs the display 43,
According to the signal value on the display 43, the rotary stator 31
Digitally displays the rotational position of 60 degrees in electrical angle. Based on the display of the rotational position, the solenoid 38
is activated to unlock the gear 33, and at the same time, the small motor 35 is reversed by the switch to rotate the rotor shaft 4.
For example, the rotating position of the rotary stator 31 may be set at 1 electrical angle so that the starting speed corresponds to the starting characteristics of the load connected to the
In the case of 50 degrees, the magnetic sensor 32 detects the magnetic detection body 34f and operates until the display 43 displays 150 degrees, which is the target starting rotation position of the rotary stator 31.
When the target starting rotation position is displayed, the operation of the small motor 35 is stopped, and the solenoid 38 is activated to lock the gear 33 and fix the rotation of the rotation stator 31.

After the above operation is completed, when the windings 22 and 23 are energized from the power source, the rotor shaft 4 starts the rotary stator 31 at a smooth rotational speed according to the starting rotation position 7, and then activates the solenoid 38. As well as starting and unlocking gear 33,
Operate the switch to rotate the small motor 35 in the forward direction, and the speed detector 44 detects the change in the rotation speed of the rotor shaft 4, and the speed indicator indicates that the rotation speed of the rotor shaft 4 has reached the desired rotation speed. 45, 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.

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 7.0 is sucked into the air blower 7.0 through the air outlet 69 and exhausted to the outside of the air blower 70 through the air outlet 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 11i39A....

Since it is discharged from each of 39B..., the resistance material r.
The heat generated by the resistance material r... does not become very high and is not stored. However, in the low-to-medium speed rotation range where the speed has been changed, the heat generated by the resistance material r... increases rapidly, so the cooling impeller 19 In the case of air blowing action of only .20, 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 rotational speed change of the electric motor 1, and the electric rotation efficiency is effectively applied, and the heat generation of the resistance material r... The durability of each of the non-magnetic cores 9 involved in this can be improved and maintained.

Note that the air exhaust port 74B of the air blower 73 is communicated with the air outlet 68 provided in the machine frame 14, and outside air is passed through by the air blower 73. It may be configured such that the air is introduced into the 1W467 and the exhaust gas is removed from the exhaust port 69. In any case, since the outside air 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, the resistance material r... and the non-magnetic core 9 are cooled. The air outlet 68. can have an effective effect on heat radiation. There may be a plurality of exhaust ports 69.

In addition, as shown in FIG. 9, the pump 10 is connected to the water Pa101.
A refrigerant device 104 formed by a radiator 103 connected via a radiator 9. Resistance material...
Cooling heat dissipation works more effectively. Although not shown, the refrigerant device 104 includes a cooler, a condenser, and a refrigerant gas.

The configuration with various other refrigerant devices can be arbitrarily selected and implemented, and as the rotor shaft 4 changes speed from high speed rotation to low speed rotation, the blower device 73
When the electric motor 1 is operating at high speed, the blower device 73 and the refrigerant device 104 stop the motor 72 or one of the refrigerant devices 104, and In some cases, priority is given to energy saving while checking the relationship with electric efficiency of 11!1 using data. Note that the blower device 73. Each of the other refrigerant devices 104 can be arbitrarily selected and implemented by arranging them elsewhere and communicating with the air outlet 68 or the air exhaust port 69 via a duct without directly connecting them to the machine frame 14. It is.

In the above, the rotating stator 31 with respect to the second stator 25
Although a configuration in which the voltage phase shifter M 100 is rotatably formed in the voltage phase shifting device 100 has been described, the voltage phase shifting device M 100 is not limited to the above configuration, and can be formed by various means shown below. You can choose to do whatever you want.

First, as one of the voltage phase shifting devices 100, as shown in FIG.
Winding wires 92A formed in arbitrary plural kinds of pole numbers for each of
928.93A.

93B, windings 92A, 928.93A.

Multiple pole number changeover switches $1 to 8 for each of 93B
20, and the voltage phase shifting device 100 is formed by the pole number changeover switches 81 to 820 and connected to a power source. The appropriate number of poles selection switch corresponds to the start-up operation and specified speed required for the load connected to the rotor shaft of the motor.
・For applications requiring a wide range of speed changes for the load connected to the rotor shaft, windings 92A, 92B, and 93A are wound around the stator 90°91.

93B may be wound with a winding wire having an arbitrary number of poles.

In contrast to the above-mentioned embodiment in which the speed is changed by rotating the rotary stator 31, this method allows rapid speed change control to a speed close to the desired synchronous speed, and also allows the load to be Although it has the advantage of being able to generate large torque from low to high speeds in response to the speed changes that are made, it also has the disadvantage of not being able to change speed steplessly.

In addition, FIG. 11 shows windings 92A, 92B, 93Δ, 93
The relationship between slip and torque is shown when the number of poles of B is changed to 4 poles or 8 poles using the appropriate pole number conversion switch... and the windings 92A and 92B and the windings 93A and 93B are connected in series. This is a graph showing the effect of connecting the windings 92A and 92B and the windings 93A and 93B in series, and the effect of switching the number of poles to a nearby synchronous speed to achieve the desired speed change control for the rotor shaft. Due to the synergistic effect of the It has a remarkable effect.

Next, other means of the voltage phase shifter will be explained based on FIG. 12. Winding wire 9 wound around stators 94 and 95
6.97 are connected in series or in parallel to a power source via a plurality of phase changeover switches N1 to N19 to form the voltage phase shifter 100. In this means, the phase changeover switches N1 to N19 are appropriately switched to change the phase input from the power supply to the windings 96,97, thereby changing the rotational speed of the rotor shaft. However, in this case, since the phase is changed only by appropriately operating the phase changeover switches N1 to N19, the speed change range of the rotor shaft is designed to increase the gap in stages. be. However, this voltage phase shifter is formed by winding 9 wound with the plurality of poles.
When used together with the pole number changeover switches 81 to S20 attached to 2A, 92B, 93A, and 93B, the rotor shaft can be moved to a speed that approximates the synchronous speed in response to the load rotational speed change required for the rotor shaft. It is possible to perform right gear shift control over a small range of rotational speeds.

Next, other means of the voltage phase shifting device will be explained with reference to FIG. The output side of the winding 112 wound around the stator 110 is connected to a power source, and the output side of the winding 112 is connected to a single-phase transformer 115.
The voltage phase shifter 100 is formed by a plurality of connection changeover switches P1 to P4, and the single-phase transformer and connection changeover switches P1 to P4 of the voltage phase shifter 1. 113, the winding 112 and the winding 113
and are connected in series. From now on, winding 11
2 and the winding 113 are connected to the single-phase transformer 115 via the connection changeover switches P2 and P4, or the connection changeover switches PI and P3 are individually switched to match the phase of the voltage input to the winding 112. On the other hand, by advancing or delaying the phase of the voltage input to the winding 113, the rotational speed of the rotor shaft can be changed. Although this method is also capable of controlling the speed change of the rotor shaft 4 only in stages, it has the advantage of being able to control the speed change instantaneously.

Next, yet another embodiment of the voltage phase shifter will be described with reference to FIG. 14. The voltage phase shifter 100 of this embodiment is as follows:
It has a stator 105 fixed to a frame body and a rotor 106 rotatably pivoted inside the stator 105. The stator 105 has a primary winding 107, and the rotor 106 has a secondary winding. 108 is formed by a three-phase induction voltage regulator 109.

Terminals A, B, and C of the winding 112 of the stator 110 are connected to a commercial three-phase power source A, B, and C. 3 phase induction voltage regulator 10
Terminals A and F3°C of the primary winding 9 are terminals a and b of the winding 112 of the stator 110.

C, and the terminals a, b, of the secondary winding 108
connected to c. Terminals A, B, and C of the secondary winding 108 are connected to terminals A, B, and C of the winding 113 of the stator 111. That is, the windings 112 and 113 have the voltage phase shifter 10 in between.
They are connected in series through a three-phase inductive voltage regulator 109 with zero.

In this embodiment, by rotating the rotor 106 of the three-phase induction voltage regulator 109 provided with the secondary winding 108 by an arbitrary number of m, the windings 112, 113 of the stator 110° 111
The phase of the voltage input to the rotor shaft 4 can be shifted, and the rotation speed of the rotor shaft 4 can be controlled according to the required rotation speed.

Next, based on FIG. 15, the rotating stator 31. Second stator 25
The method of connecting the windings wound on the winding will be explained. The terminals U, V, and W of the winding 22 wound around the rotary stator 31 can be shorted to each other via a switch M1, and the terminals X, Y, and Z can be shorted to each other by a switch M6. Further, the terminals U, V, and W of the winding 22 are connected to the terminals Z, X, and Y via a switch M2. On the other hand, the terminals U, V, and W of the winding 23 wound around the second stator 25 are connected to a commercial three-phase power source through a switch M9, and the terminals X, Y, and Z are connected through a switch M3. Terminals U and V of winding 23
, W can be mutually short-circuited by a short-circuiting switch M7. Also, the terminals Ll, V of the winding 23.

W and terminals Z, X, and Y can be connected to each other via a switch M4. And the terminals R and V of the winding 22
,W,! :Terminals X and Y of winding 23.

Z via switch M8, and between terminals X, Y, Z of winding 22 and terminals U, V of winding 23.

By connecting with W via the switch Mw,
The winding 22 and the winding 23 can be connected to each other in series.

The operation of the above configuration will be explained below based on FIGS. 1 and 15.

Rotating stator 31. The connections between the windings 22 and 23 of the second stator 25 are made delta connections by turning on switches Ml, M3 and Mw and opening the other switches.
2. When power is supplied from a commercial three-phase power supply to 23, winding 2
There is no phase shift in the voltage input to 2.23, it has the same torque characteristics as a general induction motor, and the rotational speed of the rotor shaft 4 is the maximum rotational speed.

By operating the small motor 35 to rotate the rotary stator 31, the rotation speed can be continuously controlled. When the phase difference between the voltages between both stators 31 and 25 reaches 180°, the reduction in rotational speed reaches its limit. Phase angle θ = 0° when windings 22 and 23 are delta connected
The relationship between the slip and the torque from θ to -180° is as shown in FIG. 16, and the rotational speed of the rotor shaft 4 can be arbitrarily controlled and used in the slips S1 to S2. However, in the above state, when the slip S is in the range of S=S2 to S=1.0, the first
Speed control in the area indicated by hatching in FIG. 6 becomes impossible.

To deal with the above-mentioned Genmen, switch Ma, M8 and M9 are required.
At the same time as turning on the other switches, the winding 22.2
Switch the connection in step 3 to star connection, and in this state,
Magnetic flux φ1', φ2 of the rotating magnetic field created by both stators 31 and 25
′ becomes the same phase. Moreover, the windings 22 of both stators 31.25
Since each of the windings 22.
The voltage applied to 23 is 1/f3 of the delta connection. Therefore, the voltage induced in the conductor 5 of the rotor 8 by the magnetic fluxes φ1' and φ2' becomes 1/J3, and the rotor 8
Since the torque of is proportional to the square of the voltage, the torque is 1/3.

Therefore, by switching the connection of the windings 22.23 of the rotary stator 31.25 to star connection using a switch, the torque characteristic becomes θ=180' as shown in FIG.
The torque when S=1.0 is T1/3, and θ=0° s=i.

The trick at this time is T2/3, and the speed uncontrollable region shown by hatching is quite small.

Next, a second embodiment of the rotational position detector will be described with reference to FIG.

An elongated detection plate 46 is fixed to the outer peripheral surface of the rotary stator 31, and a plurality of limit switches 47.
47a .
8, and limit switches 47a...47
n is connected to a display 49 which calculates the change in the electrical resistance value inputted with the same output signal and displays the rotational position of the rotational stator 31 in electrical angles.

With the above configuration, when the rotating stator 31 is stationary, the rotating position of the rotating stator 31 is displayed on the display 49 based on the corresponding resistance value of the limit switch 47 that is in contact with the detection plate 46. . For example, when only the limit switch 47a comes into contact with the detection plate 46, the rotating position of the rotating stator 31 is displayed as 0° in electrical angle on the display 49, and the following limit switches 47b, 47C, 7d, 47e, etc. ··teeth,
Electrical angle: 15", 30", 45", 60'
...is displayed. In addition, limit switch 4
It goes without saying that any number of 7... can be selected and that various detection plates can be used. The configuration and operation other than those described above are the same as those of the first embodiment, so details thereof will be omitted.

Next, a third embodiment of the rotational position detector will be described with reference to FIG. 19.

A disk 50 is attached to the side wall surface of the rotating stator 31, and the disk 50
A plurality of detection holes 51 with different diameters are drilled in the frame 14, and a photo sensor 53 is attached to a bracket 52 screwed to the inner circumference of the machine frame 14, and integrated with the rotary stator 31. A rotation position detector 54 is formed with a photo sensor 53 facing in relation to the detection hole 51 which rotates, and the photo sensor 53 is connected to a display 55 provided with a calculation function. .

The operation of the above configuration will be explained below.

At the rest position of the rotating stator 31, the photosensor 53
detects the corresponding detection hole 51, the photo sensor 53
The detection signal is calculated on the display 55, and the rotational position of the rotational stator 31, that is, the electrical angle, is displayed.

If the rotational position of the rotational stator 31 at the start of operation is assumed to be 120 degrees in electrical angle, the rotational stator 31 is rotated so that the photosensor 53 detects the detection hole 51j and the display 55 indicates When 120° is displayed, the start switch is activated, and the rotary stator 31 is then rotated to control the desired normal rotation speed. The configuration and operation other than those described above are the same as those of the first embodiment, so the details thereof will be omitted.

Next, a fourth embodiment of the rotational position detection device will be described with reference to FIG.

An opening 56 is formed in the lower part of the machine frame 14, and the first stator 24
A rotary stator 58 is provided with worm teeth 157 fixed on one side.
to be formed. A worm 60 is connected to a pulse motor 59 attached to the outer periphery of the machine frame 14! I! The attached rotating shaft 61
The worm 60 is screwed onto the worm gear 57 to form a drive device 64. A rotary encoder 62 whose rotation shaft is connected to the rotation shaft 61 is connected to a display 63, and the display 63 is equipped with a memory circuit, an arithmetic circuit, and a digital display section, and is formed in a rotation position detection path 65.

The operation of the above configuration will be explained below. Display device 63 into which the output signal of rotary encoder 62 is input
, the rotation position of the rotating stator 58 is memorized at 06 in electrical angle, and the rotation of the pulse motor 59 is sequentially changed until the rotating position of the rotating stator 58 reaches 1800 in electrical angle. The rotational position of the rotary stator 58 is calculated into an electrical angle based on the pulse signal detected by the rotary encoder 62, and the difference between the pulse signal of the rotary encoder 62 and the electrical angle of the rotational position of the rotary stator 58 is calculated. Relationships are remembered.

Therefore, when the output value of the rotary encoder 62 is input to the display 63 at the time of starting operation, the calculated value is output to the digital display section to display the rotation position of the rotation stator 58 in electrical angles, and then , the pulse motor 59 is set so that the starting rotation speed corresponds to the starting characteristics of the load on the rotor shaft.
The rotary encoder 62 detects the rotation angle of the pulse motor 59 and displays the output signal on the display 6.
3, check how the electrical angle displayed on the digital display changes sequentially, and when the desired electrical angle is displayed, stop the operation of the pulse motor 59, activate the start switch, and start the pulse again. The motor 59 is rotated in the reverse direction from the front, and controlled so that the load connected to the rotor shaft 4 has a desired rotational speed.

This embodiment differs from the first embodiment in that the rotary stator 58 and pulse motor 59 are connected to a worm gear 57. Since the rotary stator 58 is connected to the worm 60, the rotary stator 58 can be fixed when the rotary stator 58 stops rotating without installing a separate device.
The rotational position detector 65 of 8 is the rotary encoder 6
2 or the like, the rotational position of the rotational stator 58 can be detected and displayed in a stepless manner, and starting control can be performed extremely smoothly.

In addition, in the embodiments of each of the rotational position detection devices described above, only the case where the rotational stator 31 is rotatable and formed into a voltage phase shifting device has been described, but both the rotational stator 31 and the second stator 25 may be configured to be rotatable. In this case, the rotation range of both stators 31.25 may be reduced to reach the electrical angle of 0°.
The rotating stator 31 can be controlled by a small motor or a pulse motor as a drive device.
The present invention is not limited to the above, but may include air cylinders, hydraulic cylinders, electromagnets, etc., which can be connected in various ways to form a VJn structure.

Next, an 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 76, control circuit 77, arithmetic circuit 78. A speed detector 44 such as a tacho generator equipped with a speed indicator 45 attached to the rotor shaft 4 and a circuit for detecting the rotational position of the rotation stator 31 are installed on the input side of the control device 75 consisting of a memory circuit 79 and the like. Moving position detector 42
A small motor 35 is connected to the output side of the control device 75 by connecting a temperature detector 80 attached to a suitable place on the TIA 67, a starting switch 82, and a keyboard 81 with a display. The motor 72 and solenoid 38 of a blower device 73 for cooling and dissipating heat from the conductors 5 . . . , the resistive material r . is entered. That is, the rotation ω of the rotary stator 31 corresponding to a phase angle of 0° to 180°, and the rotation angle of the rotary stator 31 (0° to 180° in electrical angle)
0"), several types of startup setting values that match the dynamic characteristics of the rotation angle of the rotation stator 31, and the temperature detected by the temperature detector 80. In contrast, a reference temperature setting value for controlling the motor 72 to increase or decrease is input.

When the operation preparation key is input from the keyboard 81 at the start of operation, the rotation position detector 42 detects the current rotation position of the rotation stator 31 and displays it on the display, and the load connected to the rotor shaft 4 is detected. When an arbitrary startup setting value that matches the startup characteristics of the controller 75 is input from the keyboard 81, the
Solenoid 3 receives a signal output from memory circuit 79 of
8 to unlock the gear 33 fitted to the rotary stator 31, and also activate the small motor 35 to rotate the rotary stator 31. When the desired starting rotation position is reached, the small motor 35 automatically stops.

When readiness for operation is displayed on the display, the speed control lvi of the rotor shaft 4 is controlled by the control device 75 from the keyboard 84.
, the rotation 1 of the rotation stator 31 is calculated to obtain the input speed control value. When the start switch 82 is activated and an input signal is sent to the control device 75, the small motor 35 is actuated in response to the output signal of the control device 75 to control the speed change of the rotor shaft 4, and the speed of the rotor shaft 4 is adjusted. The speed value detected by the detector 44 is compared with the speed control value, and if there is a difference in speed, the controller 75 outputs the output to the small motor 35 to correct the rotation speed.

With respect to the rotation amount calculation value of the rotation stator 31, the rotation speed of the motor 72 in a movement in which the rotation m is rotated within the range of 0° to 180° is stored in a memory circuit so that the rotation speed is from low rotation to high rotation. '79, so when the rotor shaft 4 is controlled to high speed rotation by the speed control value output from the control circuit 77, the motor 72 is set to low speed rotation and the rotor shaft 4 is set to low speed rotation iQ. When controlled, the motor 72 is controlled to rotate at high speed.

When the temperature detection value of the temperature detector 80 communicated with the control device 75 becomes higher than the reference setting value set in the memory circuit 79, a signal output from the control device 75 causes the motor 7 to
2 is corrected, and the ventilation action within the ventilation cylinder 67 is increased to restore the normal function of cooling and radiating heat from the non-magnetic cores 9 . . . , the resistive material r . . . . In addition, the rotating stator 31
The motor of the air blower 73 is controlled by the output signal from the control device so that the detected value of the temperature detector 80 becomes the reference temperature setting value, regardless of the speed control value that controls the motor 35 that rotates the motor 35 to rotate forward or backward. The rotational speed of 72 may be controlled to increase or decrease.

During the above operation, if a new rotational speed value is input from the keyboard 81 or a speed control value is automatically input directly from the control panel connected to the load to the control device 75 via the keyboard 81, the rotation is fixed. Based on the current position of the rotary stator 31 communicated from the rotary position detector 42 that detects the rotary position of the child 31, the small motor 35 is operated to a desired speed value to set the target of the rotor shaft 4. Shift control to rotational speed.

Furthermore, as the rotational position detection device connected to the control device 75, any one of the rotational position detection devices 48, 54, and 65 may be adopted and connected in place of the rotational position detection device 42;
It is possible to replace the small motor 35 that rotates the rotating stator 31 with a pulse motor 59, or with various rotating mechanisms such as an air cylinder, hydraulic cylinder, electromagnet, etc., or as a voltage phase shifter, see FIG. , any of the devices shown in FIGS. 10 and 12 to 15 can be selected and employed as appropriate, and various refrigerant devices 104 can be selected and connected in place of the blower device 73 provided with the motor 72. There is.

Furthermore, the variable speed induction motor of the present application can also be used as an induction generator, and if the rotor shaft 4 is directly connected to a turbine, gas turbine, solar power generator, etc. to generate electricity, an expensive governor will be required. can also 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. In addition, a switch is provided to connect the rotor shaft to another rotating shaft and to switch the two phases on the input side of the stator winding.
If the rotor shaft can be rotated forward or reverse by the switch,
By operating the switch and the voltage phase device, it can be used as an electric generator, and by controlling the rotation speed with the voltage phase device, the braking force of the rotating shaft connected to the rotor shaft can be efficiently adjusted. .

What is shown in FIG. 22 is a case in which a plurality of conductors 5 installed in each of the rotor cores 2.3 rotate in the space between the rotor cores 2.3 or in the 9 parts of the non-magnetic core. This is an embodiment in which the island resistance ring 116 fitted into the child shaft 4 is short-circuited by a resistance material r serving as a connecting member. Resistance material r・
Even if they are not connected to all of the conductors 5, they can still obtain the appropriate effect.

In addition, the cooling body 13 is attached to the non-magnetic core 9 by the cooling blade vehicle body 13.
A may be attached to the rotor shaft 4, or the cooling blade vehicle body 13A may be directly attached to the rotor shaft 4.

〔Effect of the invention〕

As explained above, according to the present invention, a plurality of conductors are installed in each of a plurality of rotor cores, and the plurality of rotor cores are attached to a rotating shaft to form an integral rotor. the plurality of conductors are short-circuited and connected between the plurality of rotor cores by a resistive material, and a voltage phase shift device is provided in relation to at least one stator among the plurality of stators. In the electric motor having the above configuration, a space between the plurality of stators, between the plurality of rotor cores, and a machine frame that intersects the plurality of stators is formed in a ventilation shell, and is opened in the machine frame. Since the air blower is connected to the air outlet or exhaust port, the air blower can be operated to introduce outside air into the ventilation shell.
1.In addition to being able to effectively cool and dissipate heat from the resistance material, ensuring sufficient torque especially in the low and medium speed ranges and increasing the electric efficiency of the motor, it also has a remarkable effect of improving the durability of the resistance material. be.

[Brief explanation of the drawing]

1 to 22 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. Figure 4 is a diagram showing the relationship between rotor slip and active power, Figure 5 is an electrical equivalent circuit diagram of the rotor, Figure 6 is an electrical equivalent circuit diagram seen from the stator side, Figure 7 is a diagram showing the relationship between speed and torque when a plurality of conductors are short-circuited using resistive materials and the windings wound around the stator are connected in series, and Figure 8 is a diagram showing the relationship between the windings of the stator. A diagram showing the relationship between speed and slip when each is connected to a power source in parallel, Figure 9 is a side view of the radiator connected to the ventilation cylinder, and Figures 18 and 10 are diagrams showing the relationship between the speed and slip when the radiator is connected to the power supply in parallel. Connection diagram with windings to be formed, No. 11
The figure shows the relationship between speed and torque characteristics in 4-pole and 8-pole systems, Figure 12 is a configuration diagram of a voltage phase shift device in which a phase shift selector switch is connected to the stator winding, and Figure 13 is a voltage An embodiment diagram in which the phase shift device is formed by a single-phase transformer and a phase shift changeover switch, FIG. 14 is an embodiment diagram in which the voltage phase shift device is an induction voltage regulator, and FIG. 16 and 17 are diagrams showing the relationship between speed and torque characteristics. FIG. 18 is a sectional view showing a second embodiment in which the rotational position detector is formed by a limit switch. , Fig. 19 is a partially cut away side detector showing the rotating mechanism of the rotating stator, showing a third embodiment in which the side detector is formed by a photosensor, and Fig. 20 shows a rotating position detector with storage and calculation functions. FIG. 21 is a block diagram showing the configuration of automatic control, and FIG. 22 is a partial sectional view showing a resistance material connected between a plurality of conductors. 1... Induction motor 2, 3... Rotor core 4
... Rotor shaft 5 ... Conductor 6.7 ... Short circuit ring 8.8A to 8C ... Rotor 9 ... Non-magnetic core 10.11 ... Side part 12 ... Ventilation barrel
13... Cooling effect body 13A... Cold fJl wing body 14... Shaft 15.16... Bearing plate 17.
...Connecting rod 18...Nut 19.20...
・Cooling impeller 21...Bearing 22.23・
...Winding 25...Second stator 26...Sliding shaft 27...Fixing ring 28...Stop ring 29...Drive device 30...Rotating mechanism 31
...Rotating stator 32...Magnetic sensor 33.
・Gear 34.348~34g ・Magnetic detector 35 ・Small motor 36 ・Drive gear 37 ・Opening
38...Solenoid 39...Exhaust hole
40... Ventilation hole 41... Non-magnetic plate 42
...Rotation position detector 43...Display device 44
...Speed detector 45...Speed indicator 46...
・Detection plate 47.47a to 47n...Limit switch 48...Rotation position detector 49...Indicator 50...
・Disk 51.51a~51n...Detection hole 52・
...Bracket 53...Photo sensor 54...
・Rotation position detection 55... Display 56... Opening 57... Worm gear 58... Rotating stator 59... Pulse motor 60... Worm 61... Rotating shaft 62 ...Rotary encoder 63...Display device 64...Drive device 65.
... Rotation position detector 66 ... Space 67 ... Ventilation barrel 68 ... Ventilation port 69 ... Ventilation port
70...Blower cylinder 71...Windmill 72
... Motor 73 ... Air bag r11 74A.
...Air intake port part 74B...Air exhaust port part 75...Control device 76...Input/output circuit 77...Control circuit 78...Arithmetic circuit 79...Memory circuit 80.
...Temperature detector 81...Keyboard 82...
Starting switch 90.91... Stator 92A, 92B, 93A, 93B... Winding 94.95
... Stator 96.97 ... Winding 100 ... Voltage phase shifter 101 ... Water tank 102 ... Pump
103...Radiator 104...Refrigerant device
105...Stator 106...Rotor 1
07...Primary winding 108...Secondary valley wire 109...
・3-phase induction voltage regulator 110.111...Stator 1
12,113...Winding 114...Single-phase transformer 1
15...Single-phase transformer 116...High resistance ring r...Resistance material S1-320...Pole number changeover switch N1-N19...Phase shift changeover switch P1-P4...Connection changeover switch M1~MIO...switch

Claims (10)

[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 using a resistive material in a space formed between the rotor cores or a non-magnetic material portion, and a plurality of stators are arranged concentrically with the plurality of rotor cores and facing the outer periphery thereof. In the electric motor, a voltage phase shifting device is provided 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 space formed between the rotor core and the machine frame is formed in a ventilation shell, and an air outlet is opened in the machine frame so that the introduced outside air cools and radiates heat from the resistance material and exhausts it outside the machine frame. a variable speed induction motor, characterized in that an air exhaust port is opened in the machine frame facing the air outlet, and an air blower is communicated with either the air outlet or the air exhaust port. cooling system. (2) A cooling body is attached to one or both inner surfaces of the rotor shaft, the non-magnetic material portion, or the plurality of rotors in the space within the ventilation barrel. A cooling device for a variable speed induction motor according to item (1). (3) A refrigerant device consisting of a radiator, a cooler, a condenser, a refrigerant gas, etc. is disposed directly or via a blower at the air intake port or the air blower.
A cooling device for a variable speed induction motor according to item 1). (4) controlling the rotational speed of the rotor shaft so as to increase or decrease the rotational speed of a motor provided in the blower in accordance with a voltage phase shifter provided in connection with the rotary stator; Claim 1, wherein the voltage phase shifter and the motor are connected to a control device that provides a speed control value.
) A cooling device for a variable speed induction motor as described in item 2. (5) disposing a temperature detector at any location on the ventilation shell;
A control device for a variable speed induction motor according to claim 1, wherein a temperature detector and a motor of the blower are connected to the control device provided with a reference temperature set value. (6) At least one stator among the plurality of stators has an electrical phase angle of 0° to 18° relative to the other stator.
Claims (1) to 11, wherein at least one stator among the plurality of stators is rotatably formed in the phase shift device within a rotation range of 0°. (5)
A cooling device for a variable speed induction motor according to any one of paragraphs. (7) Claim (1) wherein the voltage phase shifter is formed by connecting a phase changeover switch to a winding wound around at least one stator among the plurality of stators. ~
A cooling device for a variable speed induction motor according to any one of paragraph (5). (8) The voltage phase shifting device is formed by a single-phase transformer wound around at least one of the plurality of stators and a connection switch. A cooling device for a variable speed induction motor according to any one of paragraph (5). (9) The voltage phase shifter is formed by connecting each of the plurality of stators with a winding having a plurality of types of pole numbers to the terminal thereof, and connecting a pole number changeover switch to the terminal thereof. A cooling device for a variable speed induction motor according to any one of items (1) to (5). (10) The voltage phase shifter is provided with a switch that can freely switch the connection of the windings wound around each of the plurality of stators to either delta connection or star connection. A cooling device for a variable speed induction motor according to any one of items (1) to (5).