Symbol description
K Pm
COS
nT + nS ( kS - 1 )
Pc1 1 + ( nS / nT )( ks - 1 )
Inverter capacity [KVA]
ψ
nT lm 1 + ( nS / nT )( kS - 1)
Inverter capacity [A]
Description
Calculated of 150% for 1 minute
Motor acceleration of 1 minute or more
88
≦
≦
Pm : Motor shaft output required for the load[kw]
: Motor efficiency (normally, approx. 0.85)
COS : Motor power factor (normally, approx. 0.75)
Vm : Motor voltage[V]
lm : Motor current[A] (current with commercial power supply)
k :
Correction factor calculated from current from factor (1.05 to
1.1, depending on the PWM method.)
Pc1 : Continuous capacity[KVA]
kS : Motor starting current/motor rated current
nT : Number of motors in parallel
nS : Number of simultaneously started motors
GD
2
: Total (GD
2
) converted into motor shaft (kg-m
2
)
tL : Load torque(kg-m)
tA : Motor acceleration time
η
η
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Содержание AP2G3-1110
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