Fuji Electric Frenic Mega Series - Chapter 10 Selecting Optimal Motor and Inverter Capacities

Chapter 10
SELECTING OPTIMAL MOTOR AND INVERTER CAPACITIES
This chapter describes the capacity selection of motor and inverter. This chapter provides you with information
about the inverter output torque characteristics, selection procedure, and equations for calculating capacities to
help you select optimal motor and inverter models. It also helps you select braking resistors, HD/MD/LD drive
mode, and motor drive control.
Contents
10.1 Selecting Motors and Inverters................................................................................................10-1
10.1.1 Output torque characteristics ...........................................................................................10-1
10.1.2 Selection procedure .........................................................................................................10-4
10.1.3 Equations for selections...................................................................................................10-7
[1] Load torque during constant speed running..................................................................10-7
[2] Acceleration and deceleration time calculation.............................................................10-9
[3] Heat energy calculation of braking resistor .................................................................10-14
[4] Calculating the RMS rating of the motor .....................................................................10-15
10.2 Selecting a Braking Resistor .................................................................................................10-16
10.2.1 Selection procedure .......................................................................................................10-16
10.2.2 Notes on selection..........................................................................................................10-16
10.3 Selecting an Inverter Drive Mode (HD/MD/LD).....................................................................10-17
10.3.1 Precaution in making the selection ................................................................................10-17
10.3.2 Guideline for selecting inverter drive mode and capacity ..............................................10-18
10.4 Selecting a Motor Drive Control ............................................................................................10-19
10.4.1 Features of motor drive controls ....................................................................................10-19
10.4.2 Selecting a motor drive control by purpose....................................................................10-24