JP2927840B2 - Rotor of 2 stator induction motor - Google Patents

Description

Description: BACKGROUND OF THE INVENTION The present invention relates to an induction motor having a two-stator configuration, and more particularly to a two-stator induction motor rotor integrally formed with two rotor cores. About.

[Conventional technology]

The applicant has described in detail the configuration and part of the operation of an induction motor having a two-stator configuration as Japanese Patent Application No. 61-128314. The rotor of these induction motors is 2
Since two rotor cores are required in opposition to the stators, various means have been taken to connect the rotor conductors between the rotor cores. In other words, the rotor cores are each cast and another conductor is fixed or fitted between the rotor cores, or only the conductors between the rotor cores are integrally formed and slotted between the rotor cores. Some of them are welded simultaneously with the casting of the conductor of the rotor core. However, in order to form an integral rotor, both casting and separate manufacturing steps are required, such as fixing, fitting, welding, etc. It is. Further, in the case of welding at the same time as casting, it was not possible to secure the strength of welding that could guarantee mechanical strength at the casting temperature of the molten casting material.

[Problems to be solved by the invention]

For example, the rotor of an induction motor having a two-stator configuration includes:
Two rotor cores are provided with rotor conductors in communication with each other, and in addition, two rotor cores which are not opposed to the two stator cores are connected by a connecting material between the rotor conductors. In the case where two rotor cores are provided with rotor conductors in communication with each other to form an integral rotor, a conductor is provided between the rotor cores or a conductor between the rotor cores and a conductor of the rotor core. And the number of man-hours is increased due to sticking to the above.

In the case where a connecting member for connecting the adjacent rotor conductors between the rotor cores is provided, if the connecting member protrudes to the outer periphery of the rotor conductor, the connecting member is fixed to the rotor conductor by welding or the like. Or, in order to simultaneously form the conductor between the rotor cores and the connecting member by complicating the casting mold, the man-hour has been increased and the mold has been complicated and expensive. In particular, when the stator is fixed by welding, when the two-stator induction motor is used in a low-speed range, the connecting member may generate heat due to the characteristics of the motor. In some cases, cracks were formed in the vicinity of the fixing and the mechanical strength was significantly reduced. For this reason, it is desirable to integrally form the connecting member by casting, but as described above, the die cost and the number of steps are increased.

In general, aluminum is used for the casting material of the rotor conductor, but aluminum is heat-treated for molding,
An oxide film is formed on the surface. When the oxide film is formed, even if it comes into contact with a separate high-temperature cast material of aluminum, complete electrical continuity cannot be obtained.From this point, casting can be divided twice to form a rotor conductor. Did not.

From the above, similar to the casting of a rotor core of an induction motor, which is generally performed, the casting is formed at the same time as the casting into an integrated rotor having two rotor cores, thereby reducing man-hours and thereby reducing manufacturing costs. An object of the present invention is to provide an integrated rotor having two rotor cores, which measures the reduction and secures mechanical strength.

[Means for solving the problem]

According to the present invention, two rotor core groups formed by laminating steel plates provided with a plurality of slots are juxtaposed coaxially at arbitrary intervals, and the two hollow bodies having hollow portions penetrating therethrough are provided. A plurality of slots of the two rotor core groups communicate with each other through the hollow portion of the hollow body, and each of the hollow bodies has a hole communicating with the outside from the hollow portion. Aluminum is cast from a plurality of slot holes at both ends different from the rotor core groups, and the rotor conductors are formed in the slots, and short-circuit rings are formed at both ends different from the rotor core groups and are adjacent to each other at the same time. A plurality of holes of the hollow body are connected to each other to form an integral cage rotor, which is a means for solving the above technical problem.

Further, a means for solving the problem is provided by providing a sheet material made of a brazing material in the hollow portion of the hollow body to be cast.

(Operation)

The operation of the present invention is as follows. Two rotor core groups are arranged side by side at an arbitrary interval coaxially, and a plurality of rotor core groups having a hollow portion penetrating therethrough communicating with the slot holes of the rotor cores facing each other between the arranged rotor core groups. Since the hollow body is provided, the slot holes of the two rotor core groups and the hollow body are connected in a communicating manner, and aluminum is cast from the other end different from that between the rotor cores of the slot holes of the rotor core, The hollow body having a hollow portion serves as a conduit for the casting material from the slot hole of one rotor core to the slot hole of the other rotor core,
At the same time as the casting, a rotor conductor communicating the slot hole of the two rotor cores and the hollow body is formed, and the two rotor cores are formed as an integral rotor.

Further, a plurality of hollow bodies between the rotor cores are provided with holes communicating from the hollow parts to the outside, and the adjacent holes of the plurality of hollow bodies are connected to each other with a casting material at the same time as casting. Therefore, the hollow body only needs to be provided with a hole communicating from the inside of the hollow part to the outside, and there is no need to integrally form a resistance member connecting the plurality of hollow bodies in advance. There is no need to fix the resistance material by welding or the like as in the prior art, and distortion of the fixed portion due to heat generation of the resistance material does not occur because there is no fixed portion such as welding.

In other words, since the connecting material for connecting the rotor conductors is also connected to the holes of the adjacent hollow bodies with the casting material at the same time as the casting, the rotor conductor and the resistance material between the rotor conductors are simultaneously cast by the casting material. Can be formed. At this time, the rotor conductor and the resistor are made of the same material, and the distortion due to the heat generated by the resistor has no effect on the mechanical strength because there is no fixed portion between the rotor conductor and the resistor. The hollow body at this time is not limited to the conductive material.

In addition, when the hollow body is made of a conductive material, when a sheet material made of a brazing material is applied to the hollow portion of the hollow body, particularly when the hollow body is made of aluminum, the cast material and the hollow body can be easily fixed by casting. And an electrically uniform conduction state can be secured. The hollow body material at this time can be brazed.

〔Example〕

The present applicant has already described in detail, as Japanese Patent Application No. 61-128314, the structure and operation of an induction motor composed of two stators which form a part of the structure of the present invention.

First, FIG. 1 shows an embodiment of a rotor according to the present invention. In the figure, reference numeral 2 denotes a rotor according to the present invention. The rotor 2 includes rotor core groups 4 and 5 formed by stacking steel plates 3.
Is mounted on a rotating shaft 7 (a mandrel at the time of casting) at an arbitrary interval, and a hollow body 9 having a hollow portion 8 penetrating is provided between rotor core groups 4 and 5 at an arbitrary interval, and is rotated. The slot hole 6 provided in the daughter core and the hollow portion 8 are communicated. At this time, a hollow portion 8 is provided corresponding to each of the slot holes 6, or one hollow portion 8 is provided for a plurality of the slot holes 6.
And so on. Rotor core groups 4, 5 configured in this way
The hollow body 9 and the hollow body 9 are connected by casting, and a rotor conductor 11 and a short-circuit ring 12 are formed by a casting material 10 to form an integral rotor.

Next, a hollow body in a case where a connecting member is provided in the rotor conductor 11 between the rotor core groups 4 and 5 will be described with reference to FIG. In this case, the hollow body 9 is formed of a conductive material and provided with a connecting member 15 for connecting the plurality of hollow bodies 9, and the hollow body 9 and the connecting member 15 are integrally formed.

At this time, the materials of the hollow body 9 and the connecting member 15 can be freely selected according to the characteristics of the electric motor, such as stainless steel, nickel, their alloys, and the like. Further, the shape of the connecting member is not limited to the present embodiment, and various shapes such as a shape protruding largely to the outer periphery, a disk shape, and a flat shape as shown in FIG.

Here, when aluminum is used as the conductive material, since an oxide film is formed on the surface of aluminum, when the rotor conductor is formed by casting aluminum, the cast aluminum, that is, the rotor conductor 11, and the hollow The body 9 is insulated from the oxide film and the connecting member 15 does not work. At this time, in order to secure conduction between the hollow body 9 and the rotor conductor 11 at the same time as the casting, when a sheet material made of a brazing material is attached to the inner surface of the hollow portion 8 of the hollow body 9, the brazing material is melted at the temperature of the casting material at the time of casting. The connection between the hollow member 9 and the casting material is made, and conduction between the connecting member 15 and the rotor conductor 11 is ensured.

Next, an embodiment in which a connecting member is formed simultaneously with casting will be described with reference to FIG.

The hollow body 9 is provided with a hole 16 communicating from the hollow portion 8 to the outside,
An inflow passage 17 is provided in a casting mold so as to connect the holes 16-1 and 16-2, and the holes 16-2 and 16-3, and the holes 16 of the hollow body 9 adjacent to each other. When the mold is formed in this manner, the injected casting material flows into the slot hole 6 of the rotor core, the hollow portion 8 of the hollow body 9 and the inflow path 17, and the rotor conductor 11, the short-circuit ring 12, and the connecting material 15 are formed. Formed at the same time.

The casting of the rotor core group of this embodiment will be described with reference to FIG. According to FIG. 6, the mandrel 24 used for casting is inserted into the rotor core groups 4 and 5 and the hollow body 9.

Hold the mandrel 24 on the mold stand 25, and connect the
Rotor core group 5 by mold 21 with 15 parting lines
Is held. A mold 22 for holding the rotor core group 4 is placed on the mold 21. The mold 23 having the casting inlet 28 and the gate 30 is moved while pressing the mandrel bed 26.
It is placed in. In addition, hot-water pools 31 and 32 are provided on a dividing line between the mold 21 and the mold 21 forming the connecting member 15 and a dividing line between the mold 21 and the mold stand 25.

The mold is pressurized from the upper and lower sides in FIG. The aluminum flows from the gate 30 into the slot hole 6 and the hollow portion 8 and flows into the basins 31 and 32 together with the air in the flow path, completing the operation.

Incidentally, the casting mold and the like are not limited to the present example, and the parting line and the like can be formed into various shapes for convenience of operation.

In addition, in the slot hole of the rotor core group,
It goes without saying that an insulating material is applied to the rotor core surface where the hollow body is provided.

By the way, a device for heating or cooling the mold may be provided in advance depending on the difference in heat conduction between the materials, and the device is arbitrarily provided depending on the material to be cast.

According to the present invention, the hollow body is provided between the rotor cores and connected to the slot holes of the rotor conductor in a communicating manner, so that the rotor conductor can be formed by casting and the rotor can be integrally formed. Multiple dies for conductors between cores and many man-hours are no longer required.

In addition, even if an aluminum material is used as the conductive material, since a sheet material made of a brazing material is attached to the inner surface of the hollow portion of the hollow body, regardless of the oxide film of the aluminum material generated after the heat treatment for separate molding. By the melting of the brazing material at the temperature of the casting material, conduction between the casting material and the hollow body is ensured.

Further, by providing a hole in the hollow body from the hollow portion to the outside,
By connecting adjacent holes with a casting material at the same time as casting, the casting mold may be provided with only a connecting material on the outer periphery of the rotor conductor between the rotor cores, and the rotor conductor between the rotor cores may be provided. Is formed by a hollow body, so that the casting mold is simple.

(Effect)

According to the present invention, by providing a hollow body having a hollow portion between the rotor core groups, an integral rotor is formed by casting, and a hole is provided in the hollow body from the hollow portion to the outside, so that simple metal is provided. It became possible to form a connecting material between the rotor conductors at the same time as casting with a mold, and to incorporate an amyl molded product at the same time as casting, regardless of the aluminum oxide film.

From the above, when casting aluminum with a single rotor as in a general induction motor, casting is simple even with a somewhat large one because casting is simple. In the case of an induction motor having two rotor cores, both the mold and the device are large, so it is difficult to integrally form them by casting. The present invention also makes it possible to use small and large rotors of a child induction motor.

From this, from large to small, the phase shift of the rotating magnetic field is provided between the two stators to diversify the torque and expand the applications of induction motors of the type that improves variable speed or startability. Thus, it can greatly contribute to any field requiring a high torque variable speed motor.

[Brief description of the drawings]

1 is a first embodiment of the present invention, FIG. 2 is a front view of a rotor core, FIG. 3 is an embodiment of a hollow body and a connecting member, FIG.
The figure shows an embodiment of another hollow body and a connecting member, FIG. 5 shows an embodiment of the hollow body and the casting, and FIG. 6 shows an embodiment of the casting and its mold. In the figure, 2 ... integral rotor, 3 ... steel plate (core), 4,5 ... rotor core group, 6 ... slot hole, 7 ... rotary shaft, 8 ...
Hollow portion, 9 Hollow body, 10 Cast material, 11 Rotor conductor, 12 Short circuit ring, 15 Linking material, 16 Hole, 17
Inflow channel, 21, 22, 23, 25 ... mold, 24 ... mandrel, 26
... mandrel bed, 28 ... inlet, 30 ... gate,
31,32 ... The pool.

Claims (2)

(57) [Claims] 1. A rotor having two rotor cores on the same rotating shaft, and a plurality of rotor conductors communicating with the two rotor cores is provided, or between two rotor cores. An integral cage rotor in which the plurality of rotor conductors are short-circuited to each other by a resistance material, and windings wound around two stator cores arranged concentrically with the two rotor cores A two-stator induction motor having a voltage phase shifter for providing a phase difference between the two stators, wherein the integral cage rotor is provided in a plurality. Two rotor core groups formed by laminating steel plates with slots are arranged side by side in rotation, and a plurality of hollow bodies having hollow portions penetrated are provided between the two rotor core groups, A plurality of slots of two rotor core groups communicate with each other through a hollow portion of the hollow body, Each has a hole communicating from the hollow portion to the outside, and aluminum is cast from a plurality of slot holes at both ends different from those between the rotor core groups, and a rotor conductor and a different end from the rotor core group are inserted into the slots. A rotor for a two-stator induction motor, wherein a short-circuit ring is formed at the same time and holes of a plurality of adjacent hollow bodies are connected to each other to form an integral cage rotor. 2. A two-stator induction motor according to claim 1, wherein the hollow body is made of a conductive material, and a sheet material made of a brazing material is provided in a hollow portion of the hollow body to be cast. Rotor.