Laminated iron core manufacturing method and device

Abstract

The invention provides a laminated iron core manufacturing method and device. The laminated iron core can be formed by stacking a plurality of iron core thin plates with irregular shapes such as petals in a twisted and inclined manner. The method includes a pushing-back procedure of pushing back the iron core thin plates after blanking or semi-blanking along the shape (h3) from strip material conveyed in an intermittent manner; a blanking procedure of blanking the iron core thin sheets (2) from the strip material (W) and separating them; and a stacking procedure of stacking the iron core thin plates (2) for forming the lamination body. The pushing-back procedure is configured for obtaining different shapes (h3) through changing rotation predetermined angles (alpha) by taking the central position of the iron core thin plate (2) as a reference.

Description

technical field [0001] The present invention relates to a method for manufacturing a laminated core obtained by laminating a plurality of core thin plates having an irregular (non-circular) outer shape such as a petal shape, and a laminated core manufacturing apparatus. Background technique [0002] Conventionally, it is known that in a permanent magnet excitation type motor, the outer shape of a laminated iron core (core sheet) used in a rotor is provided in a petaloid shape for the purpose of reducing cogging torque (see Patent Document 1). In this conventional motor, the laminated core thin plates are twisted to give a predetermined skew angle, and a ring-shaped permanent magnet magnetized corresponding to the skew angle is fitted inside the rotor, whereby cogging can be realized. Reduced torque and reduced assembly man-hours. [0003] Patent Document 1: Japanese Patent No. 4080273 [0004] However, in the prior art of the above-mentioned Patent Document 1, although a l...

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Problems solved by technology

[0004] However, in the prior art of the above-mentioned Patent Document 1, although a laminated iron core (rotor) provided with a predetermined skew angle is used, the work of twisting the laminated iron core thin plates is not easy, and there are difficulties in high Problems such as accurately setting the skew angle

In particular, unlike the structure in which permanent magnets are fitted inside the rotor (cylindrical hole) as in the above-mentioned prior art, permanent magnets are fitted in a plurality of magnet mounting holes provided around the shaft hole of the rotor. structure, it becomes more difficult to skew the laminated core sheets

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