Delta VFD015EL43W-1 - Symbol Explanation

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