Standard Heavy-duty Cast Iron 250 Series Frame
Dedicated 250 frame for 75hp/55kW power range, integrally cast thickened cast iron with deep internal cavity and integrated thickened base ribs, resisting distortion under alternating impact loads.
Skewed Slot Low-harmonic Electromagnetic Core Assembly
Skewed laminated stator and rotor silicon steel suppress slot magnetic harmonics, cutting electromagnetic vibration and noise, reducing power loss under 55kW full load with minimal efficiency decline over years.
Class F Epoxy Vacuum Sealed Windings
Double-layer Class F enameled stator wires fully sealed by void-free epoxy vacuum impregnation, resisting VFD pulse voltage, metallurgical dust and moisture corrosion to avoid partial winding discharge breakdown.
Long Tolerance For 130% Short-time Overload
The large 250 frame reserves ample electromagnetic margin, supporting steady 20-minute operation under 130% rated load, with strong fault tolerance for material jams and instantaneous impact loads.
Staggered Widened Circulating Cooling Structure
Interlaced widened cooling ribs and large-diameter centrifugal fan boost air circulation volume, realizing even temperature distribution during continuous full-load operation without local overheating risks.
Universal Compatibility With All Mounting Types
Cast iron housing only, compatible with full standard mounting types B3/B5/B14/B35/B34. Direct replacement for old mining, smelting and large agitator equipment without extra base machining, saving assembly time.
Q:What standard speed options are available for the 55kW cast iron motor upon delivery?
A:We have 2-pole, 4-pole, 6-pole and 8-pole models in regular stock. Low-speed multi-pole variants are equipped with enlarged cooling fans to guarantee heat dissipation.
Q:Is this motor compatible with soft starters?
A:Fully compatible. Matched soft starters can greatly reduce startup inrush current and protect front power supply circuits and rear loads.
Q:What basic inspections should be carried out before restarting the motor stored for more than 3 months?
A:Check bearing lubrication condition, test winding insulation resistance with megohmmeter, and run no-load for half an hour without abnormal conditions before applying loads.
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