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2.3 When it is running continuously
The requirement of load capacity should be less than the capacity of AC motor drive(kVA)
The requirement of load capacity=
k
P
cos
The motor capacity should be less than the capacity of AC motor drive
k
3
The current should be less than the rated current of AC motor drive(A)
k
I
M
Symbol explanation
: Motor shaft output for load (kW)
P
M
: Motor efficiency (normally, approx. 0.85)
η
: Motor power factor (normally, approx. 0.75)
cos
: 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
C
1
: Starting current/rated current of motor
k
S
: Number of motors in parallel
n
T
: Number of simultaneously started motors
n
S
: Total inertia (GD
2
GD
: Load torque
T
L
: Motor acceleration time
t
A
N
: Motor speed
Chapter 17 How to Select the Right AC Motor DriveCT2000 Series
M
the
_
capacity
_
of
3
V
I
10
the
_
capacity
M
M
the
_
rated
_
current
2
) calculated back to motor shaft (kg m
_
AC
_
motor
_
drive
(
kVA
_
of
_
AC
_
motor
_
_
of
_
AC
_
motor
_
drive
2
)
17-3
)
drive
(
kVA
)
(
A
)
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