... package for rotor and stator,motor insulation ≥300MΩ,the motor security was much improved.3. High technique products adopting MPPT ... DSP chip technique.4. 100% copper wire, cold-rolled silicon steel sheet5. Stainless steel 304 & 316 shaft , motor body, screw6. 3 years ... for rotor and stator, motor insulation ≥300MΩ, the motor security was much improved. High technique products adopting MPPT and DSP ...