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2.3 When it is running continuously
The requirement of load capacity should be less than the capacity of the AC motor drive(kVA)
The requirement of load capacity is
k ⋅ PM ≤ the _ capacity _ of _ AC _ motor _ drive(kVA) η ⋅ cosϕ
The motor capacity should be less than the capacity of AC motor drive
k ⋅ 
3 ⋅VM ⋅ IM ⋅10−3 ≤ the _ capacity_ of _ AC _ motor _ drive(kVA)
The current should be less than the rated current of AC motor drive(A)
k ⋅ IM ≤ the _ rated _ current _ of _ AC _ motor _ drive( A)
Symbol explanation
PM
η
cosϕ
VM
IM
k
PC1 kS
nT nS
GD2
TL
tA
N
:Motor shaft output for load (kW)
:Motor efficiency (normally, approx. 0.85)
:Motor power factor (normally, approx. 0.75)
:Motor rated voltage (V)
:Motor rated current (A), for commercial power
:Correction factor calculated from current distortion factor
:Continuous motor capacity (kVA)
:Starting current/rated current of motor
:Number of motors in parallel
:Number of simultaneously started motors
:Total inertia (GD2) calculated back to motor shaft (kg m2)
:Load torque
:Motor acceleration time
:Motor speed
Revision August 2006, SE08, SW V2.61 |
