Delta C200 Series User Manual page 24

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Symbol explanation
P
: Motor shaft output for load (kW)
M
η
: Motor efficiency (normally, approx. 0.85)
ϕ
cos
: Motor power factor (normally, approx. 0.75)
: Motor rated voltage(V)
V
M
: Motor rated current(A), for commercial power
I
M
: Correction factor calculated from current distortion factor (1.05-1.1, depending on PWM
k
method)
: Continuous motor capacity (kVA)
P
1
C
: Starting current/rated current of motor
k
S
n
T : Number of motors in parallel
n
: Number of simultaneously started motors
S
2 : Total inertia (GD
GD
: Load torque
T
L
t
A
: Motor acceleration time
: Motor speed
N
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Chapter 3 How to Select the Right AC Motor Drive|C200 Series
2
) calculated back to motor shaft (kg m
3-3
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2
)
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