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k
Symbol explanation
P
: Motor shaft output for load (kW)
M
: Motor efficiency (normally, approx. 0.85)
η
ϕ
cos
: Motor power factor (normally, approx. 0.75)
V
: Motor rated voltage(V)
M
: Motor rated current(A), for commercial power
I
M
k
: Correction factor calculated from current distortion factor (1.05 - 1.1, depending
: Continuous motor capacity (kVA)
P
C
1
k
: Starting current/rated current of motor
S
n
: Number of motors in parallel
T
n
: Number of simultaneously started motors
S
: Total inertia (GD
2
GD
T
: Load torque
L
t
: Motor acceleration time
A
N
: Motor speed
Revision July 2008, BE16, SW V4.08 & V5.00
The requirement of load capacity should be less than the capacity of AC
motor drive(kVA)
The requirement of load capacity=
×
k
P
M
≤
the
η
ϕ
×
cos
The motor capacity should be less than the capacity of AC motor drive
×
×
×
k
3
V
I
M
M
The current should be less than the rated current of AC motor drive(A)
×
≤
I
the
_
rated
M
on PWM method)
2
) calculated back to motor shaft (kg m
Appendix C How to Select the Right AC Motor Drive|VFD-B Series
_
capacity
_
of
_
AC
−
×
≤
3
10
the
_
capacity
_
current
_
of
_
motor
_
drive
(
kVA
_
of
_
AC
_
motor
_
AC
_
motor
_
drive
2
)
)
_
drive
(
kVA
)
(
A
)
C-3
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