Where: φ _ 1: electric power use coefficient φ _ 1 = 0.7 ÷ 0.9 φ _ 2: load coefficient, is the ratio between the power consumption with the maximum suát φ = 0.5 ÷ 0.8 1 _. φ _ 3: coefficient of simultaneous work of the electric motor: φ = 0.5 ÷ 3 _ 1 φ _ 4: mechanical conversion coefficients into thermal energy and radiate into the air around the φ 4 = 0.65 ÷ _ 1. 860: equivalent heat works N (kW): standard capacity of the electric motor. For safety, we get the largest coefficient:φ_1×φ_2×φ_3×φ_4=0.9×0.8×1×1=0.72
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