Induction motor

Abstract

In an axial-air-gap induction motor which has a disk-shaped stator and rotor placed coaxially around a rotating shaft with their surfaces opposing each other across a predetermined gap, the stator and rotor are each composed of a disk-shaped yoke and teeth fitted and secured in the yoke, making it easy to fasten the stator to the bracket, and the rotor to the rotating shaft, as well as to mount windings in the stator core and rotor core.

Description

technical field [0001] The present invention relates to an induction motor, if in more detail, it is a flat type (disc type) induction motor that will form a disc-shaped stator and a rotor coaxially arranged with an air gap in the axial direction, and particularly relates to an air conditioner Induction motors used. Background technique [0002] A flat induction motor is a motor in which a disc-shaped stator and a rotor are arranged coaxially with respect to the rotating shaft in a state where they face each other. Usually, the stator core and the rotor core have a strip-shaped electromagnetic steel sheet wound In the spiral wound body, a plurality of open grooves are formed at equal intervals in the circumferential direction from the outer circumference in the direction of the rotation axis and in the circumferential direction, leaving only a part of the electromagnetic steel sheet. [0003] The slot of the stator core is insulated, the main coil and the auxiliary coil are...

AI Technical Summary

Problems solved by technology

[0006] However, in the conventional induction motor having the above configuration, since the stator and the rotor are composed of coils of electromagnetic steel sheets, it is difficult to fix the stator to the frame (casing), and it is also difficult to fix the rotor to the rotating shaft. question

[0007] This problem can be solved by integrally forming the bracket with resin molding on the outer peripheral side of the stator, but the use of resin will increase the cost, and there is a problem in disposal, so it is desirable to avoid it from the perspective of environmental protection.

[0008] Also, from the perspective of the stator core and the rotor core, since there are open slots, and the opening of the slots is enlarged to facilitate the insertion of coils, the reluctance of the air gap tends to increase, which wastes the magnetomotive force and causes a decrease in efficiency.

Not only that, the spatial variation of the magnetic flux density on the air gap is also increased, and thus vibration or noise is generated

[0009] In order to eliminate this, the slot opening of the stator core can also be reduced, but in that case, not only a dedicated winding machine is required, but also another problem that the efficiency of the winding operation is reduced

Likewise, if the slot opening of the rotor core is also reduced, its rotor coils are difficult to insert into the slots

[0010] In addition, as an alternative method of forming the rotor coil on its narrow slot opening, die casting can also be considered, but there are disadvantages such as increased cost due to increased manufacturing processes, etc.

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