Motor, transformer core and manufacturing method thereof

Abstract

The invention relates to a motor, a transformation core and a manufacturing method of the transformation core. The transformation core is characterized by being composed of a plurality of magnetic conduction metal powder compact solid layers and a plurality of ceramic insulation powder compact solid layers, the magnetic conduction metal powder compact solid layers and the ceramic insulation powder compact solid layers are alternately distributed from bottom to top at intervals, and the bottommost layer and the topmost layer of the core are the ceramic insulation powder compact solid layers. The transformer core is high in material utilization rate, high in mechanical strength, high in size precision, small in eddy current loss and high in magnetic permeability.

Description

technical field [0001] The invention relates to the field of electric engineering, in particular to a motor, a transformer core and a manufacturing method thereof. Background technique [0002] At present, most motor cores and transformer cores are made of magnetically permeable steel sheets laminated with insulating layers between the steel sheets. Motors and transformer cores rely on this structure to weaken the eddy current inside the metal magnetic conduction mechanism caused by being in an alternating magnetic field. But there is following deficiency in this structure: 1, because motor iron core is not regular shape, so there will be a large amount of scraps in the process of using monoblock steel sheet punching and shearing into iron core sheet, cause material waste; 2, the iron core sheet of punching and shearing formation It needs to be stacked and riveted together to make an iron core. Because it is stacked and riveted and has a loose lamellar structure, the mechan...

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Problems solved by technology

But there is following deficiency in this structure: 1, because motor iron core is not regular shape, so there will be a large amount of scraps in the process of using monoblock steel sheet punching and shearing into iron core sheet, cause material waste; 2, the iron core sheet of punching and shearing formation It needs to be stacked and riveted together to make an iron core. Because it is stacked and riveted and has a loose lamellar structure, the mechanical strength is not high, and it cannot withstand too much shear force and peeling force, so it is not suitable for use as a stressed member; 3. Punching The dimensional accuracy of the parts after lamination of sheared steel sheets is lower than that of conventional cutting parts, and the parts after lamination of punching and shearing are not suitable for secondary processing

[0003] CN1122527A discloses a powdered iron core that solves the above problems. It adopts the method of mixing and pressing metal powder and insulating powder to make the iron core. This method effectively solves the three shortcomings of the above traditional technology, but this technology introduces The new problem is the problem of the mixing ratio of magnetically conductive metal powder and ceramic insulating powder: if the metal powder has a good magnetic permeability effect, but there will be contact between the metal powder particles, conduction will occur, and eddy current loss will occur after conduction. The efficiency of the iron core is reduced; and if the content of ceramic insulating powder is high, the eddy current loss will be reduced, but the insulating powder is not magnetically conductive, which will lead to a decrease in the magnetic properties of the iron core

These two situations are trade-offs and cannot be achieved at the same time. Compared with the traditional form of punching and riveting, this technology is inferior in both magnetic permeability and eddy current loss, which is the main reason why this technology cannot be promoted.

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