JPS6116772Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the structure of a rotating field type motor.

In order to generate large torque in a rotating field type motor, it is necessary to reduce the gap between the rotor and the stator core and to increase the magnetic flux density in the gap. For this purpose, the cross-sectional area of the magnetic path in the stator core must be increased, which poses the problem of increasing the size of the entire motor. In addition, in order to reduce the gap between the rotor and stator core, it is necessary to accurately achieve coaxiality between the bearing that holds the rotor and the stator core.
High precision was required.

The present invention solves the problems of conventional devices as described above, and provides a rotating field type motor that can generate large torque, is small, and can be easily manufactured. This is the purpose.

Hereinafter, the rotating field type motor of the present invention will be explained using the drawings.

FIG. 1 is a developed view showing one embodiment of the rotating field type motor of the present invention. In the figure, 1 is an end block, 2 is a stator core made of laminated steel plates, etc., and 3 is an end block.
is an armature coil wound around the stator core 2, 4 is a rotor made of a permanent magnet, 5 is a bearing, and 6 is a tightening screw used when the stator core 2 is clamped by the end block 1. be. Rotor 4 is bearing 5
It is held by the end block 1 via the holder and placed inside the stator core 2.

FIG. 2 is a cross-sectional view of the stator core 2 taken along line A-A'. As shown in the figure, the stator iron core 2 has a square cross section with four corners chamfered into circular arcs. In the stator core 2 formed in this way, what determines the magnitude of its magnetic resistance is the portion of the magnetic path where the cross-sectional area is the smallest, that is, the core portion indicated by a in the figure. The width of the iron core limits the magnitude of the magnetic flux density that the stator iron core 2 can produce. If an attempt was made to create a magnetic path with similar magnetic resistance using the conventionally used cylindrical stator core, the outer shape would look like the circle indicated by the broken line in the figure. . As is clear from the figure, by making the cross section of the stator core 2 square with four corners chamfered into circular arcs, the entire motor can be made compact.

The end block 1 has a square shape that is approximately the same size as the stator core 2, and has protrusions 1 at its four corners that engage with the chamfered portions of the stator core 2.
1, and the inside of this protrusion 11 is chamfered in an arcuate shape having the same radius as the chamfered portion of the stator iron core 2. Therefore, if they are combined so that the four corner chamfers of the stator core 2 are in contact with the inside of the protrusion 11 of the end block 1, the end block 1 and the stator core 2 will have accurate coaxiality. It will be fixed. Now, if we consider the machining of the chamfered portions of the end block 1 and stator core 2 and the machining accuracy,
According to modern processing technology, processing concentric circles based on a determined center can be performed relatively easily and with high precision by using a machine tool such as a lathe. Therefore, by holding the rotor 4 through the end block 11 bearing 5 and positioning the stator core 2 using the protrusions 11, the stator core 2 and the rotor 4 are aligned. It is possible to assemble with accurate coaxiality, and it is possible to reduce the gap between the stator core 2 and the rotor 4.

As explained above, in the rotating field type motor of the present invention, the stator core has a square cross section with four corners chamfered into circular arcs, and the stator core is mounted on end blocks that hold the stator core. A protrusion that engages with the chamfer is provided, and the inside of this protrusion is chamfered in an arc shape with the same radius as the chamfer of the stator core, making it possible to generate large torque while also being compact. Therefore, it is possible to realize a rotating field type motor that is easy to manufacture.

[Brief explanation of the drawing]

1 and 2 are a developed view and a sectional view showing an embodiment of the rotating field type motor of the present invention. 1... End block, 2... Stator iron core, 3
... Armature coil, 4 ... Rotor, 5 ... Bearing,
6...Tightening screw.

Claims (1)

[Scope of utility model registration request] a stator iron core having a square cross section with its four corners chamfered in an arc shape, and a stator iron core that holds the stator iron core and has a square cross section that is approximately the same size as this stator iron core, and has the above-mentioned fixing at its four corners. an end block having an arcuate chamfered protrusion on the inside thereof with the same radius as the chamfered part of the stator core so as to engage with the chamfered part of the child core; A rotating field type motor comprising a rotor.