Large axial fans are high inertia loads, which mean that motor start times are increased. With a standard motor this could lead to overheating, but these motors are designed to withstand the increased temperature rise during start and stall conditions, and have stall times longer than their start times. The motors utilize optimized rotor bar designs with higher resistivity copper alloys. The motors have been re-dimensioned to accommodate the temperature rise associated with high inertia starts, and the overall design has been optimized to achieve balance between torque and temperature performance. The 6 - 10 pole motors are designed in accordance with NEMA standards and cover the power range 7000 to 18500 hp in frame sizes 710-900. Voltages can be supplied up to 13.2 kV 60 Hz, with cooling systems available as WPII, TWEAC and TEAAC.
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ABB Baldor Electric Company
www.baldor.com
479.646.4711
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