Chapter 10
SELECTING OPTIMAL MOTOR AND INVERTER CAPACITIES
This chapter provides you with information about the inverter output torque characteristics, capacity selection
procedure, and equations for calculating capacities to help you select optimal motor and inverter models. It also
helps to select the braking resistors, inverter specification (HHD/HND), 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 the Inverter Rating Specification (HHD/HND) ··············································· 10-15
10.4.1 Precautions in making the selection ································································ 10-15
10.4.2 Guideline for selecting inverter specification and capacity ···································· 10-16
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