Described in the paper are the working principle, technical modification solution and modification result of the grow plasma nitriding furnace.

The structure and magnetic field feature of seal motor used in nitriding furnace is analyzed, and the mathematical model for the magnetic field is set up.

A good nitriding furnace in structures was designed and made. The results show that the properties of this kind of nitriding furnace are stable and the effects of energy-saving are excellent.