JP2919483B2 - Rotating stator support device for 2-stator induction motor - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an induction motor, and more particularly, to any one of a single rotor, a plurality of stators, and the plurality of stators. A voltage phase shifter for generating a phase difference between a voltage induced in a rotor conductor portion facing one of the stators and a voltage induced in a corresponding conductor portion of the rotor facing the other stator. The present invention relates to a so-called two-stator-structured rotating stator support device for an electric motor, which can arbitrarily change the rotation speed and generated torque of a rotor by adjusting a voltage phase shifter.

[Conventional technology]

Methods for controlling the speed of the induction motor include a method of changing the power supply frequency, a method of switching the number of poles of a winding applied to a stator, and a method of controlling a primary voltage. In addition, Japanese Patent Publication No. 27-4357
As described in the publication, the stator is divided into two sets of a fixed stator and a movable stator, each of which has the same winding and is connected to the same power supply. Are connected to each other by a widened wing-shaped conductor at the center and connected at both ends by short-circuit rings, and to the secondary induction voltage induced by rotating the movable stator and secondarily induced by the other fixed stator. A variable-speed induction motor that generates a different-phase current in the same conductor so that the current of the two vectors passes through the rotor conductor as a secondary current and arbitrarily changes the speed of the motor. Since the stator is mounted on the slide bearing so that it can move, the sliding friction between the rotating stator and the sliding bearing is large, and the rotating stator is rotated to control the speed of the rotor. Requires a large force when The rotor generates heat corresponding to the phase difference if provided, but was heavily taxes the sliding bearings by expansion of the rotating stator according to the heat generation. If the rotating stator is to be automatically controlled by a small motor, the load becomes considerably large. For this reason, the use of a large rotating motor becomes unavoidable, which not only requires wasteful large power but also practically cannot be practically used. This tendency became remarkable as the size of the 2-stator motor increased.

[Problems to be solved by the invention]

In the two-stator induction motor according to the present invention, in a rotor in which a rotor conductor is short-circuited with a resistance material, a current flows through the resistance material due to a phase difference generated by a voltage phase shifter, thereby increasing the rotor conductor resistance. As a result, a large torque can be generated, but on the other hand, the heat generated by the resistance material is also large, and the rotary stator formed rotatably in the machine frame of the electric motor expands due to the influence thereof. When a bearing is provided between the shaft and the inner periphery of the machine frame, the bearing cannot rotate due to thermal expansion. The present invention seeks to provide a technique for solving such a problem.

[Means for solving the problem]

A plurality of conductors are provided in a continuous manner on two rotor cores which are mounted on the same rotation shaft with an arbitrary gap therebetween, and the plurality of conductors are short-circuited between the two rotor cores by a resistance material. An integrated rotor connected thereto, and two stators arranged side by side in the machine frame and concentrically with the rotor facing the outer periphery thereof;
At least one of the two stators is formed as a fixed stator that rotates concentrically with the rotor, and the other is formed as a fixed stator, and the rotary stator is rotated. A voltage phase shifter that causes a phase difference between the voltage induced in the rotor conductor portion facing the rotating stator and the voltage induced in the rotor conductor portion facing the fixed stator is provided. In the two-stator induction motor having, one support is provided on each of outermost ends of the two stators so as to be rotatable about a rotation shaft, and the supports are connected to each other with a connecting material to form a support device, By fixing the rotary stator to the support device, it is a means for solving the above problem.

(Operation)

According to the present invention, for the rotation of the stator, a support device is provided on the stator, and the support device rotatably supports the support on the rotation axis of the rotor at the outermost ends of the two stators. Since the supporting member is connected by the connecting member, the rotating stator is supported by the bearing structure of the supporting device which is not affected by the heat generated by the resistance material that short-circuits the rotor conductor, and the bearing device is directly mounted on the stator. Since the bearing device is not provided, the bearing device is not affected by the heat generated by the resistance member and the stator and the thermal expansion of the stator and the like due to the heat generation.

Conventionally, there is a type in which a support is rotatably provided only on the side of the rotary stator and on the rotor shaft to make the stator rotatable. However, the support for supporting the stator is fixed. Because of the cantilever structure on the side of the rotor, the size of the motor increased in size and the size of the support became larger, and it was no longer possible to guarantee a reduction in strength and a resulting gap between the rotor and the stator. However, according to the present invention, as described above, at the outermost ends of the two stators, a support is provided rotatably on the rotation shaft of the rotor, and a support device in which the supports are connected by a connecting material is provided to support the rotary stator. by doing,
It has become possible to stably maintain the strength surface and the associated parts, that is, the gap between the stator portion and the rotor portion.

〔Example〕

Hereinafter, the configuration of the two-stator induction motor according to the present invention will be described with reference to FIGS.

Rotor portions 2 and 3 made of an iron core are mounted on a rotor shaft 4 at arbitrary intervals, and the rotor portion is formed by laminating steel plates having a plurality of conductor holes to form a rotor core, An insulating material is applied to the rotor core and aluminum is cast to form a plurality of conductors 5 in the conductor holes, short-circuit rings 6 and 7 at one end thereof, and end portions 51 at the plurality of conductors on the other side. did. Further, between the rotor portions 2 and 3, the conductors 55 are integrally formed by connecting the conductors 55 in a communicating manner. The conductor 55 connected in a communicating manner between the rotor parts 2 and 3 is short-circuited via a resistor r, for example, aluminum, a copper-nickel alloy, a nickel-chromium alloy, an iron-chromium alloy, and stainless steel. The conductor 55 between the rotor portions 2 and 3, the space formed by the resistance material, and the periphery thereof are formed as they are, or are made of a non-magnetic material.

Further, the resistance material r can be formed on the cooling body 13 as a cooling agitator having an arbitrary shape. Thus the rotor part
The integral rotor 8 is formed by the conductors 2 and 3 and the conductor 55 and the resistance material r.

The rotor portions 2 and 3 are provided with a plurality of ventilation drums 12 communicating with both side portions 10 and 11 of the rotor 8.

The stators 25 and 31 are provided concentrically with the rotor portions 2 and 3 so as to face the rotor portions 2 and 3, respectively, and a plurality of ventilation drums 60 that communicate with the stators 25 and 31 on both sides of the stator. Is provided.

Bearings 21, in which both ends of the rotor shaft 4 are fitted to bearing plates 15 and 16,
Bearings 15 and 16 are integrally mounted on both sides of a cylindrical machine frame 14 with bolts 17 so that the rotor 4 is rotatable.

As shown in FIGS. 1 and 2, the rotating stator 31 and the second stator 25 are provided with the windings 22, 23 concentrically with respect to the rotor portions 2, 3 as described above. And confront each other. At this time, as is apparent from FIG. 1, the coil ends of the windings 22, 23 projecting in the direction of the rotation axis 4 of the stators 25, 31 extend from the center of the stators 25, 31 to the outside of the stator circumference. In this way, the length of the induction motor according to the present invention in the direction of the rotation shaft 4 in which the resistance material is provided between the plurality of rotor cores can be configured to be short.

The rotation stator 31 is provided with a supporting device so as to be rotatable, and the second stator 25 is fixed to the inner wall surface of the machine frame 14 to be a fixed stator. A gear 33 is fitted on one outer peripheral surface of the support body 80, and an outer frame 32 is provided on a small forward / reverse rotation small motor 35 formed with a driving device 29 fixedly provided on the outer peripheral portion of the machine frame 14 to reduce the size. motor
A drive gear 36 is axially mounted on 35, and a drive gear 36 is mounted on the outer frame 32.
And the reduction gear 34 is rotatably provided. The reduction gear 34 partially inserted into the machine frame 14 through the opening 37, and a support 80
A rotary stator is engaged via a rotary mechanism 30 including a small motor 35 having a switch forming a drive device 29 and a drive gear 36 and a reduction gear 34 by engaging a gear 33 fitted on the
The rotating stator 31 which is connected to the rotating stator 31 and is rotatable relative to the second stator 25 fixed to the machine frame 14 is formed into a voltage phase shifter. It is set up. Reference numeral 38 denotes a solenoid for controlling the movement of the projecting piece in and out, and the solenoid 38 is mounted on the machine frame 14 and the projecting piece is engaged with a gear 33 fitted on the rotating stator 31 so as to be freely mounted, thereby generating torque. This is a stopper for preventing the stator from rotating easily unless necessary, such as a reaction to the stator at the time.

A cooling device 73 is formed by fixing a small motor 72 on which a fan 71 is pivotally mounted to a fan case 70 having a suction unit 74A and an air discharging unit 74B, and the cooling device 73 is fixed to the machine frame 14. Then, the suction unit 74A of the cooling device 73 is connected to the inside of the machine casing 14.

A plurality of openings 39 are opened, and the plurality of openings 39 are formed in an arbitrary number of air outlets 65 and air outlets 66, and the air outlets 66 communicate with the suction ports 74A.

The bearing plates 15 and 16 are provided with a plurality of ventilation holes 40.

Next, FIG. 3 shows a rotor portion 2 including a resistance material r and a conductor 55,
FIG. 3 is a side sectional view taken along the line 3; A plurality of conductors formed by conductors 56 and 57 having a curved portion at the end 51 of the rotor portions 2 and 3
55 is fixedly connected.

The resistance material r is surrounded by the conductor 55 fixed in communication.
Are connected and welded. At this time, the resistance material r may be integrally formed with the conductor 55 by a die casting method. Although the conductors 56 and 57 having the curved portions are shown above, the curved portions may be omitted in some cases. In such a case, the conductor 56 may be brought into contact with the conductor 57 at an arbitrary interval.

By the way, the example in which the conductor 55 is formed by the conductor 56 and the conductor 57 has been described.However, a portion obtained by providing the conductor 56 and the conductor 57 having a curved portion in a symmetrical shape and fixing them together by welding means such as spot welding, As described above, they may be integrally formed by a die casting method. At this time, the cross-sectional shapes of the conductors 56 and 57 can be arbitrarily selected. By the way, in this embodiment, the voltage phase shifter is based on the rotation of the stator, but the means for providing a phase difference between one and the other stators, such as a method of changing the connection of the stator, is not limited to this embodiment. .

The configuration of the two-stator induction motor according to the present invention has been described above.

Next, an embodiment of the present invention will be described with reference to FIG. 1, FIG. 2 and FIG.

Supports 80 and 81 are provided concentrically with the rotating shaft 4 at the outermost ends of the fixed stator 25 and the rotating stator 31, respectively. The supports 80 and 81 are fitted with bearings 82 and 83, respectively, and are rotatable with respect to a rotating shaft.

A plurality of connecting members 84 are fixedly provided on the outer periphery of the rotating stator 31, and the supporting member 80 and the supporting member 81 are connected by the connecting members 84 and fixed with bolts 85. These supports 80, 81 and bearings 82, 83
A supporting device is constituted by the connecting member 84. Here, the connecting member 84 is fixedly provided on the outer periphery of the rotating stator 31,
On the outer periphery of the fixed stator 25, the fixed stator 25 and the machine frame
It penetrates through a ventilation drum 60 provided between the inner circumference of the air duct 14 and the inner circumference of the air duct 14.

From the above configuration, the stator 31 is rotatable concentrically with the rotating shaft 4, and forms the rotating stator 31 with respect to the fixed stator 25.

By the way, as described above, the driving device 29
A gear 33 driven and engaged by a reduction gear 34 engaged with a gear 36 is fitted, and is rotatable relative to the fixed stator 25 by driving of a rotating mechanism 30. 31 is formed in the voltage phase shifter.

In the above configuration, the rotor shaft 4 is formed by the bearings 82 and 83.
The rotary stator 31 is formed concentrically and supported by a connecting member 84 connecting the rotatable supports 80 and 81, and its rotation is adjusted and set by the small motor 35 of the driving device 29. . The rotation of the rotating stator 31 causes a phase shift in a rotating magnetic field generated between the rotor and the stator, and controls the rotation speed of the rotor by increasing or decreasing the voltage induced in the rotor conductor. Can be changed arbitrarily. When the rotating stator 31 is further rotated, the conductors 55 and 5 provided in a communication manner between the rotors 2 and 3 are connected.
Is an integrated structure that is short-circuited and connected by a resistance material r.
A current due to the phase difference flows through the resistance material r, and the rotor conductor 5
, The resistance increases, and a large torque can be generated.

The above-described two-stator induction motor has a bearing fitted to the supports 80 and 81 and is formed concentrically with the rotating shaft 4 so as to be rotationally fixed to the inner surface of the machine frame as in the conventional example. The pressure on the fitting surface from the inner surface of the machine frame due to the fitting with the bearing interposed between the outer peripheral surface of the rotating machine and the outer peripheral surface of the machine frame disappears, and the rotating stator can be rotated by a small motor. In addition, when a large torque is generated in the two-stator induction motor, heat generated by the resistance material of the rotor conductor accompanies thermal expansion of the rotating stator. Squeaking or non-moving, providing a gap between the rotating stator support and the machine frame inner surface facing it,
By supporting the stator described in detail above with a support device, it becomes negligible. Further, since the supporting device is provided with a gear on the bearing plate side where the thermal expansion is small, that is, on the outside of the stator, and the device is rotated, the rotation of the rotating stator by the supporting device is more smoothly and stably rotated. It can be.

〔The invention's effect〕

The present invention is configured as described above, enables the rotation of the stator with a small force, and operates the part for supporting the rotation stator at a low temperature even when operated for a long time or with a high torque and generates a large amount of heat. It can be used, and a gap is provided between the rotating part and the fixed part, so that there is no hindrance to the rotation of the stator at all, enabling smooth operation as a two-stator induction motor with excellent torque characteristics and efficiency. Things.

From the above, the phase shift of the rotating magnetic field is provided between the two stators to diversify the torque, and to expand the applications of the induction motor of the type that improves the variable speed or the startability, thereby increasing the high torque. It can greatly contribute to any field that requires a variable speed motor.

[Brief description of the drawings]

FIG. 1 is a two-stator induction motor according to the present invention, FIG. 2 is a front sectional view of a support portion of FIG. 1, and FIG.
FIG. 4 is a detailed sectional view of a portion between the rotor cores of the stator induction motor, and FIG. 4 is a front sectional view of the stator core portion of FIG. 1 ... 2 stator induction motor, 2, 3 ... rotor part, 4 ...
... rotor shaft, 5 ... rotor conductor, 6,7 ... short-circuit ring, 8 ...
... Rotator, 10,11 ... Both sides, 12 ... Cass body, 13 ... Cooling body, 14 ... Machine frame, 15,16 ... Bearing board, 17 ... Bolt, 21 ... Bearing, 22 , 23 ... winding, 25 ... second stator, 2
9 ... Drive device, 30 ... Rotating mechanism, 31 ... Rotating stator, 3
2 ... outer frame, 33 ... gear, 34 ... reduction gear, 35 ...
Small motor, 36 ... Drive gear, 37 ... Opening, 38 ...
Solenoid, 40 ... vent, 51 ... end, 55 ... conductor with curved portion, 56 ... conductor, 57 ... conductor, 60 ... ventilator, 65 ... vent, 66 ... vent , 70… fan case, 71… centrifugal fan, 72… motor, 73… cooling device, 74A… suction port, 74B… exhaust port, 80… support, 81
…… Support, 82 …… Bearing, 83 …… Bearing, 84 …… Connecting material,
85: bolt, r ... resistance material.

Claims (3)

(57) [Claims] 1. An axially mounted rotary shaft having an arbitrary clearance provided on the same rotating shaft.
An integrated rotor in which a plurality of conductors are provided in communication with the plurality of rotor cores and the plurality of conductors are short-circuited and connected by a resistance material between the two rotor cores; And two stators concentrically arranged with the rotor facing the outer periphery thereof, and at least one of the two stators is rotated concentrically with the rotor. For the dynamic stator,
The other is formed in a fixed stator, and by rotating the rotating stator, a voltage induced in a rotor conductor portion facing the rotating stator and a voltage applied to the rotor conductor portion facing the fixed stator are increased. In a two-stator induction motor having a voltage phase shifter for producing a phase difference with an induced voltage, one support is provided on each of outermost ends of two stators so as to be rotatable about a rotation axis. A rotating stator supporting apparatus for a two-stator induction motor, wherein the supporting members are connected to each other by a connecting member to form a supporting device, and the rotating stator is fixed to the supporting device. 2. A rotating stator supporting device for a two-stator induction motor according to claim 1, wherein a gear engaged with a driving device of the rotating stator is fitted on an outer periphery of the support. . 3. The fixing device according to claim 1, wherein the connecting member on the outer periphery of the fixed stator penetrates a ventilation drum provided between the fixed stator and the inner periphery of the machine frame. Rotary stator support device for child induction motor.