JPH033639A - Voltage phase-shifting device for multiple-stator induction motor - Google Patents

Abstract

PURPOSE:To check the heat emission on the pivoting stator side by forming the phase difference between a fixing stator and a pivoting stator so that the phase on the fixing stator side will always be advanced against the direction of rotating magnetic field generated to the stator. CONSTITUTION:When the rotating direction of a rotor 8 is counterclockwise, a pivoting stator 31 pivots in the same direction as in the rotor 8, changing the phase difference between the fixing stator 25 and the pivoting stator 31 from 180 deg. to 0 deg.. Conversely, when the rotating direction of the rotor 8 is clockwise, the pivoting stator 31 pivots in the same direction as in the rotor 8, changing the phase difference between the fixing stator 25 and pivoting stator 31 from 180 deg. to 0 deg.. This means that the rotating magnetic field on the fixing stator side is always more advanced than the rotating magnetic field on the fixing stator side. In other words, when the pivoting stator is pivoted and the phase difference is changed from 180 deg. to 0 deg., the rotating field on the pivoting stator side will pivot the pivoting stator in the direction chasing the rotating field on the fixing stator side. In this way, the heat emission of stator is always caused on the fixing stator side for the most part and the heat emission on the pivoting stator side can be checked low.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a multi-stator induction motor2)
, more specifically, it has a single rotor, a plurality of stators, and a voltage phase shifter, and by adjusting the voltage phase shifter, the rotational speed of the rotor and the generated torque can be arbitrarily changed. The present invention relates to a voltage phase shifting device for a multi-stator induction motor.

[Conventional technology]

The multi-stator induction motor of this type according to the present invention is characterized in that the rotor conductor is not affected during startup, which is performed with a relatively large phase difference based on the adjustment of the voltage phase shift device, or during low/medium speed operation. There is heat generation in the connected resistance material. The stator also has the following characteristics. Tsuma 2),
In a voltage phase shifting device whose main configuration is a rotating stator, a phase difference is created by rotating the rotating stator between a fixed stator that does not rotate and a rotating stator that rotates. When installing, with respect to the direction of the rotating magnetic field generated in the stator, the temperature rise due to heat generation on the stator side that is ahead in phase among the rotating stator and fixed stator is the heat generation on the stator side that is lagging in phase. It was found that the temperature increase was greater than that caused by

[Problem to be solved by the invention]

In a voltage phase shifting device for a multi-stator induction motor whose main component is rotation of the stator, a bearing device is installed between the outer periphery of the stator and the motor frame around the outer periphery of the stator as a means for rotating the stator. 2) There is a stator with a support fixed to the outer periphery of the stator on the outside of the stator in the rotor narrow direction, and this support is mounted on the rotating shaft so that it can freely rotate concentrically with the rotor shaft. However, due to heat generation between the resistive material provided on the rotor and the stator, the bearing device provided on the outer periphery of the stator and the support mounted on the rotation support shaft expand thermally, causing damage to the machine frame and rotation support. The fixation with the shaft and the expansion pressure with the shaft mounting portion were large, making it difficult to rotate the rotary stator.

From the above, it is necessary to suppress heat generation on the rotary stator side and ensure stable rotation of the rotary stator at all times, from the start of a multi-stator induction motor to the low/medium speed range and up to the rated rotation. is a technical issue.

In addition, when rotating the electric motor in the forward or reverse direction, if the direction of rotation of the rotary stator is always set in the same direction, for example, in the case of forward rotation, heat generation on the fixed stator side is large, and in the case of reverse rotation, the rotation This results in a large amount of heat generated on the stator side2), and the effect of heat generation on the stator on the rotating side varies depending on the direction of rotation2), resulting in instability. For this reason, it is necessary to always place the stator, which generates a large amount of heat, on the fixed stator side, both during forward rotation and reverse rotation.2) This point is a technical issue.

[Means to solve the problem]

In the present invention, each of the plurality of conductors installed in each of the plurality of rotor cores mounted on the same rotating shaft at arbitrary intervals is connected in a continuous manner, and the plurality of rotor cores are an integral rotor in which the plurality of conductors are short-circuited by a resistive material, and a plurality of stators arranged in parallel and facing each other on the outer periphery of the rotor and concentrically within the machine frame; At least one stator among the plurality of stators is formed as a rotating stator that rotates concentrically with the rotor, and the other stator is formed as a fixed stator, and the rotating stator is configured to rotate. 2) A voltage phase shift 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. In the multi-stator induction motor having a device, the voltage phase shifting device changes the phase difference between the fixed stator and the rotating stator by
This problem was solved by forming the fixed stator so that the phase on the fixed stator side always advances in the direction of the rotating magnetic field generated in the stator. Furthermore, in the present invention, the problem is solved by increasing the number of coil turns of the fixed stator than the number of coil turns of the rotating stator.

[For production]

In the present invention, when creating a phase difference in the rotating magnetic field between a plurality of stators using a voltage phase shifter, the stator whose phase is more advanced than other stators in the direction of the rotating magnetic field is always placed in the frame of the motor. Since the fixed stator is configured, the stator that generates a large amount of heat is always on the fixed stator side2), and the heat generated on the rotating stator side, which is the main component of the voltage phase shifter, can be reduced.

In addition, by increasing the number of coil turns on the fixed stator than on the rotating stator side, the shared voltage on the fixed stator side is increased and more heat generation is generated on the fixed stator side, so that the motor rotates in the forward direction. Even during reverse rotation, the fixed stator side always generates more heat, and the rotating stator side always generates less heat, regardless of the phase difference between the rotating stator and the fixed stator. The voltage phase shifting device according to the invention, which mainly consists of rotation of a stator, can always rotate stably.

〔Example〕

The configuration of a multiple stator induction motor according to the present invention will be explained below with reference to FIGS. 1 to 3.

Rotor parts 2 and 3 made of iron cores are mounted on a rotor shaft 4 with arbitrary spacing, and the rotor part is formed by stacking steel plates with a plurality of conductor holes to form a rotor core. Applying an insulating material to the rotor core and casting aluminum to form a plurality of conductors 5 in the conductor holes, short circuit rings 6 and 7 at one end thereof, and an end portion 51 for the plurality of conductors at the other side. did.

Further, a conductor 55 is connected in a continuous manner between the rotor portions 2 and 3 to form an integral structure. Rotor part 2
, 3, the conductor 55 connected in a continuous manner between the resistive material r...
・For example, short-circuit connections are made through aluminum, copper-nickel alloy, nickel-chromium alloy, iron-chromium alloy, stainless steel, etc. A conductor 55 between the rotor parts 2 and 3
The space formed by the resistive material and its surroundings may be left as is or may be formed from a non-magnetic material.

Moreover, the resistance material r can be formed in the cooling effecting body 13 as a cooling agitator having an arbitrary shape. In this way, the rotor parts 2, 3, the conductor 55 and the resistive material r form the integral rotor 8.
form.

Also, in the rotor parts 2 and 3, both sides 10.11 of the rotor 8 are provided.
A plurality of ventilation cylinders 12... are provided which communicate with each other.

A stator 25.31 respectively faces the rotor part 2.3.
are provided in the machine frame 14 concentrically with the rotor parts 2, 3, and the stator 25, 31 is further provided with a plurality of ventilation barrels 60 communicating with both sides of the stator.

A bearing 2 in which cooling impellers 19 and 20 are mounted on both sides of a rotor 8, and both ends of a rotor shaft 4 are fitted into bearing discs 15 and 16.
Bearing discs 15 and 16, which are pivotally supported at 1.21 and provided on both sides of a cylindrical machine frame 14, are integrally assembled to both sides with bolts 17, so that the rotor 4 can freely rotate.

As shown in FIGS. 1 and 2, the rotary stator 31 and the second stator 25, each having the windings 22 and 23 concentrically arranged around the rotor portion 2.3 as described above, are arranged in parallel. Set up At this time, as is clear from FIG. 1, the coil ends of the windings 22.23 protruding in the 4 directions of the rotation axis of the stator 25.31 extend outward from the center of the stator 25.31 to the outside of the stator circumference. By providing the resistance material between the plurality of rotor cores, the length of the variable speed induction motor according to the present invention in the four directions of the rotation axis can be shortened.

A slide bearing 26 is installed between the machine frame 14 and the rotary stator 31, and the slide bearing 26 is fixed against horizontal movement by a stop ring 28 fitted to the machine frame 14. Second stator 2
A fixed stator 5 is fixed to the inner wall surface of the machine frame 14.

A gear 33 is fitted on the outer circumferential surface of one side of the rotary stator 31 (2), and the outer frame 32 is connected to a small motor 35 for forward and reverse rotation, which is made up of a drive device 29 fixed to the outer circumference of the machine frame 14. A drive gear 36 is attached to the small motor 35, and the outer frame 32
A reduction gear 34 is rotatably engaged with the drive gear 36. A reduction gear 34 partially inserted into the machine frame 14 through the opening 37 and a gear 33 fitted into the rotary stator 31
and connected to the rotary stator 31 via a rotary mechanism 30 consisting of a small motor 35 with a switch, a gear 33, a drive gear 36, and a deceleration gear 34, which constitute a drive device 29, The rotary stator 31 is rotatable and rotatable in relation to the second stator 25 fixed to the machine frame 14, and is provided in the voltage phase shift device.

Reference numeral 38 denotes a solenoid for controlling the entry and exit of the protruding piece, and the solenoid 38 is mounted on the machine frame 14, and the protruding piece is engaged with the gear 33 fitted to the rotary stator 31 so as to be freely attachable.
), this is a stopper that prevents the stator from easily turning unnecessarily due to reactions to the stator when torque is generated.

A small motor 72 with a fan 71 attached to the shaft is connected to the suction section 74.
A cooling device 73 is fixedly installed in a fan case 70 having an air exhaust portion 74B, and a cooling device 73 is fixedly installed in a fan case 70 having an air exhaust portion 74B.
I will contact you within 4 days.

A plurality of openings 39 are opened, and the plurality of openings 39 are formed into an arbitrary number of ventilation ports 65 and ventilation ports 66.
communicates with the suction lower 48'.

A plurality of ventilation holes 4o... are bored in the bearing discs 15, 16.

Next, FIG. 3 shows a rotor portion 2 including a resistive material r and a conductor 55.
, 3 is a side cross-sectional view. Ends 51 of rotor parts 2, 3
A plurality of conductors 55 formed by a conductor 56 and a conductor 57 having a curved portion are fixed in a continuous manner.

A resistive material r is placed around the conductor 55 fixed in a continuous manner.
Connect and weld. At this time, the resistance material r may be formed integrally with the conductor 55 by die-casting. The conductors 56 and 57 having curved parts were shown above, but in some cases the curved parts may be omitted.2) In that case, the conductors 56 and 57 may be aligned with each other with an arbitrary interval. Sometimes.

At this point, conductor 55 connects conductor 56 and conductor 57 . ! : However, the conductor 56 and the conductor 57 having curved portions are symmetrically provided and the joined parts are fixed by welding means such as spot welding2), and as described above, they can be formed integrally by die casting method. It may also form. At this time, the conductor 5
The cross-sectional shape of 6.57 can be arbitrarily selected.

By the way, the induction motor of this embodiment is a multi-stator induction motor 2), and more specifically, a single rotor, a plurality of stators, and one stator among the plurality of stators. the rotor by adjusting a voltage phase shifter that creates a phase difference between the voltage induced in the opposing rotor conductor portions and the voltage induced in the corresponding rotor conductor portion facing the other stator. The rotation speed and generated torque can be changed arbitrarily.

The configuration of the variable speed induction motor according to the present invention has been described above.

Next, a first embodiment of the present invention is shown in FIG.

FIG. 4 is a perspective view in which the stator 25, 31 and rotor 8 are extracted and simplified. The front side of the rotating shaft 4 in FIG. 4 is the output shaft side.

In this diagram A C, C, W (counterclockwise rotation), IC in B.

W, (clockwise rotation), and each is shown below. In addition, in FIG.
0, and the machine frame 14 in relation to the protruding piece 8°,
0' (
Limit switches 81, 82, and 83 are provided to indicate the rotating positions of (no phase difference) and 180° (180° phase difference).The rotating stator 31 rotates and the limit switch 81
When you hit , the phase difference goes, and conversely, the limit switch 82 (
or 83), limit switches 81, 82, and 83 are provided, respectively, so that a phase difference of 1800 is obtained when tapped.

First, let us consider the case of C, C, and W in A. Since the rotation directions of the rotor 8 are C, C, and W, the rotating magnetic field generated in the stator is also C, C, and W.

In this case, the rotating stator 31 has a phase difference of 1800 on the limit switch 82 side, and a phase difference of O0 on the limit switch 81 side.
Set it so that 2) When the electric motor is started, the protruding piece 80 of the rotary stator 31 is in a position where it hits the limit switch 82, and as the electric motor gradually shifts to the rated rotation, the rotary stator 31 rotates to C, C, and W. and set the phase difference to 00
Then hit the limit switch 81 to stop.

Next, when the rotation of the rotor 8 of B is C, W, the rotating magnetic field generated in the stator is C2W. In this case, the rotating stator 31 is set so that the phase difference is 1110° on the limit switch 83 side and 0° on the limit switch 81 side. In other words, when the motor is started, the protruding piece 80 of the rotating stator 31 is in a position where it hits the limit switch 83, and as the motor gradually shifts to the rated rotation, the rotating stator 31 rotates to C, W, and so on. The phase difference is set to θ° and the limit switch 81 is hit to stop.

In the above explanation, the changes between case A and case B are as follows: (1) The R8T phase of the three-phase power supply to the stator is replaced with C6W.

■ Replace limit switches 81 and 83.

■ Power supply to the small motor 35 is C, W.

Replace with.

With the above configuration, the rotation direction of the rotor 8 is C, C.
, W, the rotating stator 31 rotates in the same direction as the rotor 8, and the phase difference between the fixed stator 25 and the rotating stator 31 is reduced to 1.
Change from 80° to 00°. Conversely, when the rotational direction of the rotor 8 is C or W, the rotating stator 31 rotates in the same direction as the rotor 8, and the phase difference between the fixed stator 25 and the rotating stator 31 is reduced to 180'. This will change the value from 0 to 00.

This means that the rotating magnetic field on the fixed stator side is always advanced from the rotating magnetic field on the rotating stator side.In other words, the rotating stator is rotated to change the phase difference from In' to 0°. When changing, the rotating stator is rotated in a direction in which the rotating magnetic field on the rotating stator side follows the rotating magnetic field on the fixed stator side.

Next, a second embodiment is shown in FIG. This is an example in which the windings 22 and 23 installed on the rotating stator 31 and the fixed stator 25 are connected in series to supply three-phase power. The number of turns is greater than the number of turns of the winding 22 on the rotary stator 31 side.

Generally, when power is supplied to a load in which resistive materials with different resistance values are connected in series, the resistance value of the load is the sum of the resistance values of the resistive materials connected in series2), and the current flowing through the load is also the resistance value. determined by the sum of Therefore, the same current flows through each resistor material with different resistance values, and V=IR
Therefore, regarding the potentials at both ends of each resistive material, the resistive material having a larger resistance value exhibits a larger potential.

In this embodiment, since the number of turns of the winding 23 on the fixed stator side is large, the respective potentials of the fixed stator and the rotating stator are always higher on the fixed stator side and lower on the rotating stator side.

Therefore, heat generation on the fixed stator side increases.

According to the above embodiments 1 and 2, a large amount of heat generation in the stator of the multi-stator induction motor according to the present invention always occurs on the fixed stator side, and heat generation on the rotating stator side can be suppressed to a low level. .

More specifically, a voltage phase shifter that creates a phase difference between the voltage induced in one rotor core and the voltage induced in the other rotor core is configured to rotate the negative stator. When using a movable stator as the main component, the rotary stator is relatively difficult to cool due to the attachment of a rotary device and tends to reach high temperatures, making it difficult to rotate the rotary device. According to the present invention, when setting a phase difference between the fixed stator and the rotating stator in the rotational direction of the rotating magnetic field, the rotating magnetic field on the fixed stator side is always advanced from the rotating magnetic field on the rotating stator. In other words, the rotating magnetic field on the rotating stator side always follows the rotating magnetic field on the fixed stator side, and the phase difference is changed from 1800° to θ°2), or the winding on the fixed stator side. By increasing the number of turns of the winding on the rotating stator side than the number of turns on the rotating stator side and increasing the potential on the fixed stator side, 2) the fixed stator side always generates more heat and the rotating fixed It has become possible to keep the heat generation on the child's side low.

〔effect〕

As described above, even when the motor rotates in the forward and reverse directions, the structure is configured so that more heat is always generated on the fixed stator side, so the heat generation on the rotating stator side is suppressed, and the starting speed of the multi-stator induction motor is reduced. The rotary stator can always rotate stably in the medium speed range and up to the rated rotation speed.

Based on the above, by creating a phase shift in the rotating magnetic field between the two stators and diversifying the torque in total 2), we have expanded the use of induction motors of the type that improve variable speed or startability. It can greatly contribute to any field that requires high-torque variable-speed electric motors.

[Brief explanation of drawings]

Fig. 1 shows a variable speed induction motor according to the present invention, and Fig. 2 shows a variable speed induction motor according to the present invention.
3 is a detailed view between the rotor cores of the variable speed induction motor according to the present invention, FIG. 4 is a perspective view of the first embodiment, and FIG. 5 is a diagram of the second embodiment. Stator wiring diagram. 1... variable speed induction motor, 2.3... rotor part,
4... Rotor shaft, 5... Rotor conductor, 6.7...
Short-circuit ring, 8...Rotor, 10.11...Both sides, 1
2... Passage body, 13... Cooling body, 14... Machine frame, 15° 16... Bearing plate, 17... Bolt, 19
．． 20... Cooling impeller, 21... Bearing, 22.23
...Winding, 25...Second stator, 26...Sliding bearing, 28...Stop ring, 29...Drive device, 3o...Rotation mechanism, 31...Rotation Stator, 32・
...outer frame, 33...gear, 34...reduction gear,
35... Small motor, 36... Drive gear, 37 River opening part, 38... Solenoid, 40... Ventilation port, 5
DESCRIPTION OF SYMBOLS 1... End part, 55... Conductor having a curved part, 56...
...Conductor, 57...Conductor, 60...Ventilation barrel, 65.
...Air outlet, 66...Exhaust port, 70...Fan case, 71...Centrifugal fan, 72...Motor, 73
...Cooling device, 74A...Suction port, 74B...Exhaust port, 80...Protrusion piece, 81...Limit switch,
82...Limit switch, 83...Limit switch, r...Resistance material.

Claims (2)

[Claims] (1) A plurality of conductors installed in each of a plurality of rotor cores mounted on the same rotating shaft at arbitrary intervals are connected in a continuous manner, and between the plurality of rotor cores. an integral rotor in which the plurality of conductors are short-circuited and connected by a resistive material; a plurality of stators arranged in parallel and opposite to each other on the outer periphery of the rotor within the machine frame and concentrically with the rotor; At least one stator among the plurality of stators is formed as a rotating stator that rotates concentrically with the rotor, and the other stator is formed as a fixed stator, and the rotating stator is rotated. and a voltage phase shifter that creates 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. In the multi-stator induction motor, the voltage phase shifter changes the phase difference between the fixed stator and the rotating stator such that the fixed stator side always advances in phase with respect to the direction of the rotating magnetic field generated in the stator. A voltage phase shifting device for a multiple stator induction motor, characterized in that it is formed as follows. (2) A plurality of conductors installed in each of a plurality of rotor cores mounted on the same rotating shaft at arbitrary intervals are connected in a continuous manner, and between the plurality of rotor cores. an integral rotor in which the plurality of conductors are short-circuited and connected by a resistive material; a plurality of stators arranged in parallel and opposite to each other on the outer periphery of the rotor within the machine frame and concentrically with the rotor; At least one stator among the plurality of stators is formed as a rotating stator that rotates concentrically with the rotor, and the other stator is formed as a fixed stator, and the rotating stator is rotated. and a voltage phase shifter that creates 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. 1. A voltage phase shifting device for a multi-stator induction motor, wherein the number of turns of the fixed stator coil is greater than the number of turns of the rotary stator coil.