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 MAC System
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Japanese Patent 2756899,2720138
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This is a system that Mitsui High-tec developed in 1975 for the purpose of improving the productivity of motor core. The system was introduced to the market in 1978 and, even at present, it is still attracting the concern of world manufacturers of electrical appliances.
MAC system stands for "Mitsui Automatic Core assembly system", consisting of punching die, peripheral equipment and devices for controlling them.
 Details of MAC system controller
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In the sales of MAC system, sufficient technical training is given as the need of users so as to realize smooth introduction and most efficient operation of the system.
 Improvement of productivity
The MAC system is an epoch-making one, which can provide an integrated process from punching to weighing, stacking, and lamination. By this system, rotors and stators can be made into a complete product through only two processes of stamping and lamination, allowing full automation of the motor core manufacturing process.
Improvement of quality
It is possible to carry out core-turning and alternate interlocking so as to control the decrease in product quality due to the variation in material quality.
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Thickness of coiled material is not uniform. Therefore, even if the difference in thickness on a piece of material sheet is slight, the total difference will be significant when several tens of material sheets are laminated.
In order to eliminate such a significant difference, a core under forming by lamination in a die is turned by 90 or 180 degrees, by which the difference produced by lamination can be minimized.
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In conventional interlocking, a gap is generated at the corner (shown by a blue arrow) due to the bend dimensions, causing an undesirable wider gap between material sheets.
In the case of alternate interlock, the cut and bend direction is alternated so as to make a space at the corner portion (shown in a blue arrow), reducing the gap between material sheets.
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Capable of producing various shapes
MAC system can produce cores of various shapes such as skewed, V-skewed and counter-bored as well as straight.
Cost reduction alternatives
By changing the configuration of parts, material cost can be reduced, and productivity can be improved.
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Joint is made by interlocking convex and concave portions. |
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Stator is split into two half sections. |
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Stator is split into teeth section and yoke section. |
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Stator sections are linearly connected by a thin flange to enable easy coil wrapping. The assembly is later bent into a circle to form the completed stator.
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