We bought the basic patent of the system from General Motors Corporation (GM) and developed the system, aiming to "reduce the production process largely by the combination of stamping the motor core electrical sheets and laminating them in the stamping tool.
Conventional system needed four processes for stator and 10 processes for rotor, 14 processes in total up to completion. On the other hand, in MAC system, it became possible to execute weighing, skewing, lamination by turning, caulking (binding) in series without re-caulking pressing. As a result, we succeeded in reducing the process largely, that is, one process for stator and three processes for rotor, four processes in total.
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Though the basic patent relating to MAC system was possessed by GM, it was our company that put it into actual use first in the world by applying the base technology of our company, that is, ultra-precision tooling technology and by the use of carbide die tip.
MAC system was not accepted by the engineers in Japan at first, and we advanced overseas seeking for the market and promoted the sales of MAC system in USA and Europe. As a result, MAC system was reimported to Japan and adopted by domestic users.
The groundbreaking development of technology of ours has been contributing to the popularization of home electric appliances since then.
In addition, because the turning-lamination technology of MAC system made it possible to reduce the lamination error due to the deviation of motor core thickness, the cores are precisely laminated spontaneously after being stamped and air gap (gap between stator and rotor) is reduced, which enabled even a small-size motor to generate a large output. Thus MAC system contributed the downsizing of motors since then.
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tool
Development of MAC system