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Air Gap DC

Linear air gap model of a DC machine

 

Description

Equations

Variables

Connections

Parameters

Modelica Standard Library

Description

The Air Gap DC component models the air gap of a DC machine, without saturation effects. Induced excitation voltage is calculated from the derivative of the magnetic flux, where flux is the excitation inductance multiplied by the excitation current. The induced armature voltage is found by multiplying flux by angular velocity.

Equations

ia=iap=ian

ie=iep=ien

vai=vapvan=Turns_Ratioψew

vei=vepven={0quasiStationaryψ.eotherwise

ψe=Leie

w=φ.flangeφ.support

τelec=Turns_Ratioψeia=τsupport=τflange

Variables

Name

Units

Description

Modelica ID

ia

A

Armature current

ia

ie

A

Excitation current

ie

ψe

Wb

Excitation flux

psi_e

τelec

Nm

Torque induced by electrical current

tauElectrical

vai

V

Induced armature voltage

vai

vei

V

Voltage drop across field excitation inductance

vei

w

rads

Angular velocity

w

Connections

Name

Description

Modelica ID

flange

Rotation flange

flange

support

Support at which the reaction torque is acting

support

pinap

Positive armature pin

pin_ap

pinep

Positive excitation pin

pin_ep

pinan

Negative armature pin

pin_an

pinen

Negative excitation pin

pin_en

Parameters

Name

Default

Units

Description

Modelica ID

quasiStationary

 

 

True (checked) means ignore electrical transients

quasiStationary

Turns Ratio

 

1

Ratio of armature turns over number of turns of the excitation winding

turnsRatio

Le

 

H

Excitation inductance

Le

Modelica Standard Library

The component described in this topic is from the Modelica Standard Library. To view the original documentation, which includes author and copyright information, click here.

See Also

Electrical Library

Electrical Machine Components

Electrical Machines