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Japanese patents, 2756899, 2720138
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MAC (Mitsui Automatic Core assembly) system is a stamping tool system, which stamps motor cores one by one and completes weighing, lamination by turning (skewing) and binding (caulking) in series.
MAC is a groundbreaking system in which a conventional high-speed stamping tool is provided with an assembling function. Our company succeeded in the practical application by grinding finish first in the world in 1974 by the use of carbide tool, and realized the reduction of production process and labor saving.
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 Structure of motor
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| A motor consists of two components. The one is a stator at the outside, and the other is a rotor that rotates at the inside, and both stator and rotor are made up of several-decade or several-hundred layers of electrical sheets (or silicon steel sheets). A stator has holes called slots through which wire is coiled for generating magnetic force and, by this magnetic force, a rotor is rotated. In recent years, there have been motors having a rotor made of permanent magnet.
Each piece of stamped electrical sheets is called a motor core.
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| We succeeded in the production of Φ2.7mm motor core by MAC system in the year 2000 and, in the same year, we also succeeded in the development of MAC system corresponding to thin steel sheet of 0.15mm thickness. |
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| Why did we think out MAC system? |
Before developing MAC system, the motor cores stamped out of the tool were packed after being counted one by one. However there occurred a problem that the packing process took too much time to cope with the trend of high-speed stamping.
To solve the problem, we developed an automatic packing machine and, on the way of development, we thought "How about packing 100 pieces of motor cores at a time as far as 100-piece is for one motor. Oh no, is it better to bind them spontaneously rather than packing them?" Thus the development of MAC system started.
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tool