What is Dual Stamping Technology?

In the case of a stepping motor, the gap (clearance) between stator and rotor can greatly affect performance. In order to improve efficiency, the gap must be narrowed as accurately as possible.

For attaining the above, it is a general practice to make the inside diameter of stator smaller than the design dimension and then grind it back to accurately obtain the desired gap. Since the preliminary stator dimensions overlap the rotor size, normal production methods make the two from separate material blanks.

Rotor

Stator

At Mitsui, Dual Stamping Technology makes it possible to produce the rotor and stator from the same material blank, saving the inside portion (shown in red) that had usually been thrown away. Its principle is simple. The blue portion of stator in the figure above is coined or stamped locally so that the slight decrease in thickness translates to a change in diameter. Easy enough to say, but this unique breakthrough was made possible by our long-accumulated technology.

Dual Stamping Technology is advantageous not only in reducing material cost but also in improving productivity.

• Improvement of productivity
  Because rotor and stator were manufactured separately in conventional method, two units of press (die) were necessary. In the case of Dual Stamping Technology, however, one unit of press is enough and eventually the productivity is enhanced doubly.
  
  
  
• Reduction of material cost
  Because the same material is used for rotor and stator, the material that was needed for rotor in conventional method has become unnecessary.
  

	Stator 54.2mm Rotor 29.6mm	* Percentage of reduction may differ depending on the product shape.

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