Fuji Electric FRENIC-Ace series - Chapter 10 Selecting Optimal Motor and Inverter Capacities

Chapter 10
SELECTING OPTIMAL MOTOR AND INVERTER CAPACITIES
This chapter provides information about the inverter output torque characteristics, selection procedure, and
equations for calculating the capacities, in order to be able to select optimal motor and inverter models. It also helps
to select the braking resistors, inverter mode (ND, HD, HND, or HHD), and motor drive control.
Contents
10.1
Motor Output Torque Characteristics ········································································· 10-1
10.2 Selection Procedure ······························································································ 10-3
10.3 Equations for Selections ························································································· 10-6
10.3.1 Load torque during constant speed running ························································ 10-6
[ 1 ] General equation ·························································································· 10-6
[ 2 ] Obtaining the required force F ·········································································· 10-6
10.3.2 Acceleration and deceleration time calculation ····················································· 10-8
[ 1 ] Calculation of moment of inertia ······································································· 10-8
[ 2 ] Calculation of the acceleration time ································································· 10-10
[ 3 ] Calculation of the deceleration time ································································· 10-11
[ 4 ] Calculating non-linear acceleration/deceleration time ·········································· 10-11
[ 5 ] Calculating non-linear deceleration time ··························································· 10-12
10.3.3 Heat energy calculation of braking resistor ························································ 10-13
[ 1 ] Calculation of regenerative energy ·································································· 10-13
10.3.4 Calculating the RMS rating of the motor ··························································· 10-14
10.4 Selecting an Inverter Drive Mode (ND/HD/HND/HHD) ················································· 10-15
10.4.1 Precaution in making the selection ·································································· 10-15
10.4.2 Guideline for selecting inverter drive mode and capacity ······································ 10-16