# Post-processing quantities: rotation motion

## Introduction

This paragraph deals with physical quantities computed for rotating motion .

## Kinematic variables

The list of kinematic variables used for solving and the names of the corresponding Flux parameters are given in the table below; in this table MS indicates the concerned mechanical set.

Kinematic variable Name Unit
Angular position: AngPos(MS) degree
Angular speed: AngSpeed(MS) degree/s
Angular acceleration: AngAcc(MS) degree/s²

## Physical quantities

The list of physical quantities computed in the post-processing module and the names of the corresponding Flux parameters are given in the table below; in this table MS indicates the concerned mechanical set.

Torque Name Unit Explanation
Electromagnetic torque: TorqueElecMag(MS) N.m
Internal system
Friction torque: TorqueFrInt(MS) N.m
Inertia torque: TorqueInInt(MS) N.m
Resistant torque*: TorqueReInt(MS) N.m or
External system
Friction torque: TorqueFrExt(MS) N.m
Inertia torque: TorqueInExt(MS) N.m
Resistant torque *: TorqueReExt(MS) N.m or
Note: * The resistant torque is:
• either the sum of the friction torque + the spring return torque
• or the resistant torque defined using a formula

## Reminder of the solved mechanical equation

The solved mechanical equation for rotating motion is:

where:

• J is the moment of inertia:
• is the moment of inertia of the moving mechanical set itself (internal system)
• is the moment of inertia of the external load (external system)
• is the electromagnetic torque
• is the resistant torque:
• is the resistant torque acting on the moving mechanical set (internal system)
• is the resistant torque acting on the external load (external system)

## Important note

When there are symmetries or periodicities, the computed values of the torque correspond to the entire device.