Delta Electronics AC Motor Drive VFD-VE Series Especificaciones descargar pdf (Pagina 204)

Appendix C How to Select the Right AC Motor Drive|

Revision August 2008, 2ELE, V1.02 C-3

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=

)(_____

cos

kVAdrivemotorACofcapacitythe

≤

ϕη



The motor capacity should be less than the capacity of AC motor drive

)(_____103

kVAdrivemotorACofcapacitytheIVk MM ≤××××

−



The current should be less than the rated current of AC motor drive(A)

)(______ AdrivemotorACofcurrentratedtheIk M ≤×

Symbol explanation

: Motor shaft output for load (kW)

: Motor efficiency (normally, approx. 0.85)

cos

: 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 (1.05-1.1, depending on

PWM method)

1CP

: Continuous motor capacity (kVA)

: Starting current/rated current of motor

: Number of motors in parallel

: Number of simultaneously started motors

: Total inertia (GD

) calculated back to motor shaft (kg m

)

: Load torque

: Motor acceleration time

N : Motor speed

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Delta Electronics AC Motor Drive VFD-VE Series Especificaciones Pagina 204