JPH05146120A - Motor - Google Patents

Abstract

PURPOSE:To obtain a motor whose radial width is greatly reduced by making an iron core magnetic path for letting magnetic flux pass so that the magnetic flux may pass from one stator to one rotor and return to the other stator arranged on the opposite side of the shaft as a center. CONSTITUTION:Stator windings 4 and 4a are wound in stators 1 and 1a and twin stators 20 are formed. And magnetic flux passes from the stator 1 to a rotor 2, then passes from the stator 1a to a rotor 2a, and returns to the stator 1 forming a closed circuit. Besides, the rotors 2 and 2a constitute a squirrel-cage rotor having a plurality of rotor conductors. And it is excited by the stator windings 4 and 4a and generates torque. On this occasion, the direction of rotation is determined by the positions of shading coils 3 and 3 and 5a. On the other hand, the inside peripheral parts of the stators 1 and 1a are formed like a part of a cylindrical surface, and opposed to the peripheral surfaces of the rotors 2 and 2a with very short gaps. Accordingly, the radial width of the whole of the motor can be reduced up to size being about twice as large as the outside diameter of the rotor 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor having a reduced radial width.

[0002]

2. Description of the Related Art Conventionally, for example, an induction motor has a structure in which a cylindrical stator core is provided so as to surround a rotor, and windings are mounted in slots formed at an equal pitch on the inner circumference of the stator core. Was becoming. Further, the stator core is arranged in parallel with the rotor to form the magnetic path as shown in FIG.

[0003]

In the above-mentioned conventional structure, since the outer circumference of the rotor is surrounded by the thick cylindrical stator core, the radial width of the motor is restricted by the outer diameter of the stator core. Will be done. Further, in the shaving motor of FIG. 3, the stator core is arranged in parallel with the rotor core to form a magnetic path. Therefore, if it is necessary to reduce the radial width of the motors (reduce the axial distance between the motors), such as when several motors are installed side by side in a narrow space, the stator core This has been dealt with by reducing the outer diameter dimension and thinning the stator core.

However, since there is a limit to the thinning of the stator core due to magnetic saturation and it cannot be thinned down unnecessarily, the reduction of the radial width of the motor is not sufficient at all, and the space is saved (compact). We were not able to fully meet the demands of

The present invention has been made in view of the above circumstances, and therefore an object thereof is to provide a motor capable of dramatically reducing the radial width and achieving space saving (compactness). It is in.

[0006]

According to the motor of the present invention, a rotor is provided inside the stator for a rotating function,
There are a plurality of rotors, and the rotor is formed by narrowing it with twin stators each having a pair of stators having a shading wire ring, and windings wound around the yokes of the respective stators. An iron core magnetic path through which a magnetic flux passes is passed from one stator through one rotor through the one stator and the other stator arranged on the opposite side about the axis of the rotor and through the other rotor. The motor is characterized in that a magnetic path is configured so as to return to the one stator.

[0007]

According to the above means, the two rotors can be rotated with a common magnetic path.

In this case, the outer periphery of the rotor is not surrounded by a cylindrical stator iron core as in the conventional case, but only a semi-circular iron core portion is arranged. The width can be reduced to about the same as the outer diameter of the rotor, and the shape of the entire motor can be made into a substantially rectangular parallelepiped shape that can effectively use the space.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. The stator cores 1 and 1a are arranged around the outer circumference of the rotors 2 and 2a. The stators 1 and 1a are respectively provided with shading coils 3 and 3a on the inner diameter side facing the rotor.

Stator windings 4 and 4a are wound around the stators 1 and 1a. Twin stator 2 with this stator 1, 1a
Form 0. This winding forms an exciting circuit so that the magnetic flux Φ is a closed circuit as shown by the arrow 5 in FIG. That is, the magnetic flux passing through the stator 1 passes through the rotor 2, and further returns from the stator 1a through the rotor 2a to the stator 1 to form a closed circuit. Each of the rotors 2 and 2a constitutes a cage rotor having a plurality of rotor conductors. Stator winding 4,
The magnetic flux is excited by 4a and the magnetic flux passes through the circuit to generate a rotational force in the rotor. The direction of rotation is a shading motor that is determined by the positions of the shading coils 3 and 3a.

On the other hand, as shown in FIG. 1, the inner peripheral side portions of the stators 1 and 1a are formed in an arcuate surface and face the outer peripheral surfaces of the rotors 2 and 2a with a slight gap. In this way, since two rotors are formed by one magnetic path, the lateral width L of the motor can be set to about two outer diameters of the rotor. in this case,
The rotors 2 and 2a are configured as dragon-dragon rotors in which the slots 5 of the rotor core 7 are die-cast with a secondary conductor of aluminum.

According to the present embodiment described above, the outer periphery of the rotors 2 and 2a is not surrounded by the conventional cylindrical stator iron core, and two rotors are provided so that the magnetic paths are common. Since the stator and the rotor are configured, the radial width of the entire motor can be reduced to almost the same as the outer diameter of the rotor 2 and the overall shape of the motor can be substantially rectangular parallelepiped. .. For this reason, when several motors are installed side by side in a narrow space, such as a multi-axis woodworking machine, the inter-axis distance between the motors can be greatly reduced compared to the conventional one, and the space can be saved. It enables efficient use,
The overall size of the device can be reduced.

Further, in this embodiment, the stators 1 and 1a are provided with the shadings 3 and 3a. However, instead of the shadings 3 and 3a, a rectifying device using a brush can be used for driving with a DC power supply. .. Moreover, inverter drive is also possible.
Further, a universal motor may be used.

The secondary conductors of the rotors 2 and 2a are made of pure A or copper material for one rotor 2 and the other rotor 2a is used.
It is also possible to change the starting torque and operating characteristics of the motor characteristics in various ways by using a high resistance A or brass material.

Further, in the case where only one of the two rotors 2 and 2a is stopped, as shown in FIG. 2, the other rotor, for example, the stators 1 and 1a sandwiching the rotor 2a side is sandwiched. The stator side magnetic path iron core portion 9 is arranged on one side to form a bypass magnetic path,
The magnetic flux flow to the rotor 2a is prevented, the rotation of the rotor 2a is stopped, and only one rotor 2 is rotated.

In addition, in the present invention, the rotor 2 may be changed from a dragon-shaped rotor to a wire-wound rotor, and it is not limited to the induction motor as in the above-described embodiment, but is widely applied to a synchronous motor and the like. Various modifications such as application and implementation are possible.

[0017]

As is apparent from the above description, according to the present invention, the radial width of the two motors as a whole is equal to the outer diameter of the rotor being 2 times.
The size of the entire motor can be reduced to approximately the same size as that of the double size, the shape of the entire motor can be made into a substantially rectangular parallelepiped shape, the space can be efficiently used, and the entire apparatus can be made compact.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of a motor showing an embodiment of the present invention,

FIG. 2 is a vertical cross-sectional front view of a motor with a magnetic path core attached to a side surface of a stator;

FIG. 3 is a view corresponding to FIG. 1 of the related art.

[Explanation of symbols]

1, 1a ... Stator core, 2, 2a ... Rotor,
3 ... Kuma coil, 4 ... Stator winding, 5 ... Slot, 20 ... Twin stator.

Front Page Continuation (72) Inventor Shigeo Ozawa 2121 Sayo, Asahi-cho, Mie-gun, Mie Prefecture Toshiba Corporation Mie Factory

Claims (3)

[Claims] 1. A twin stator in which a rotor is rotatably arranged inside a stator, and a plurality of the rotors are provided, and a pair of the stators having a shading coil is formed on the rotors. Each stator is provided with a winding wire wound around the yoke portion, and an iron core magnetic path through which magnetic flux passes passes from one stator to one rotor and the other stator and rotor. A magnetic path is configured so as to pass from the other stator disposed on the opposite side with respect to the axis of 1 to the other rotor and return to the one stator. 2. The motor according to claim 1, wherein a bypass magnetic path for passing a magnetic flux is formed on a side surface of one of the stators of the twin stator and the other side of the stator. 3. The motor according to claim 1, wherein the plurality of rotor conductors are formed of different specific resistance materials.