1. High efficiency; none of air gap inside iron core; lamination factor is up to more than 95%, so is efficiency.

2. Small size and light weight facilitates potentiality of shape and size required.

3. Smaller magnetic interference, magnetic leakage and magnetic radiation makes it be applicable to high-sensitive electric gear without shield.

4. Smaller degrees of noisy vibration and zero air gap inside iron core reduces noises the core sensing vibration.

5. Least iron loss during operation, low degrees of iron core temperature rise which optimizes heat dissipation while lower temperature winding, thus low temperature rise.

6. Easy installation in electric gear for rapid process and removal.