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DC Electrical Excited

Electrical shunt/separate excited linear DC machine

 

Description

Connections

Parameters

Modelica Standard Library

Description

The DC Electrical Excited component models a DC Machine with electrical shunt or separate excitation. Armature resistance and inductance are modeled directly after the armature pins, using an Air Gap DC model.

The following losses are modeled:

• 

heat losses in the temperature dependent armature winding resistance

• 

heat losses in the temperature dependent excitation winding resistance

• 

brush losses in the armature circuit

• 

friction losses

• 

core losses (only eddy current losses, no hysteresis losses)

• 

stray load losses

No saturation is modeled.  Shunt or separate excitation is defined by the user's external circuit.

Connections

Name

Description

Modelica ID

flange

Shaft

flange

pinan

Negative armature pin

pin_an

pinap

Positive armature pin

pin_ap

pinen

Negative excitation pin

pin_en

pinep

Positive excitation pin

pin_ep

support

Support at which the reaction torque is acting

support

thermalPort

Optional thermal port

thermalPort

Parameters

General Parameters

Name

Default

Units

Description

Modelica ID

Jr

0.15

kgm2

Rotor moment of inertia

Jr

Js

Jr

kgm2

Stator moment of inertia

Js

Ta,oper

293.15

K

Operational armature temperature

TaOperational

Te,oper

293.15

K

Operational (shunt) excitation temperature

TeOperational

Use Support Flange

false

 

True (checked) means enable stator support

useSupport

Use Thermal Port

false

 

True (checked) means thermal port is enabled

useThermalPort

Excitation Parameters

Name

Default

Units

Description

Modelica ID

αe

0

1K

Temperature coefficient of excitation resistance

alpha20e

Ie,nom

1

A

Nominal excitation current

IeNominal

Le

1

H

Total field excitation inductance

Le

Re

100

Ω

Warm field excitation resistance

Re

σe

0

 

Stray fraction of total excitation inductance

sigmae

Te,ref

293.15

K

Reference temperature of excitation resistance

TeRef

Brush Losses

Name

Default

Units

Description

Modelica ID

V

0

V

Total voltage drop of brushes, if ibrush>Ilinear

V

Ilinear

0.01Ianom

A

Current indicating linear voltage region of brush voltage drop

ILinear

See Brush for details of the brush loss model.

Core Losses

Name

Default

Units

Description

Modelica ID

Pref

0

W

Reference rotor core losses

PRef

Vref

Vnom

V

Reference RMS voltage

VRef

ωref

ωnom

rads

Reference angular velocity

wRef

See Core for details of the core loss model.

Friction Losses

Name

Default

Units

Description

Modelica ID

Pref

0

W

Reference friction losses

PRef

ωref

ωnom

rads

Reference angular velocity

wRef

pω

2

V

Exponent of friction

power_w

See Friction for details of the friction loss model.

Stray Load Losses

Name

Default

Units

Description

Modelica ID

Iref

Ianom

W

Reference RMS current

IRef

Pref

0

W

Reference friction losses

PRef

ωref

ωnom

rads

Reference angular velocity

wRef

pω

1

V

Exponent of stray load loss

power_w

See Stray Load for details of the stray load loss model.

Nominal Parameters Parameters

Name

Default

Units

Description

Modelica ID

Ia,nom

100

A

Nominal armature current

IaNominal

ωnom

47.5π

rads

Nominal rotational speed

wNominal

Va,nom

100

V

Nominal armature voltage

VaNominal

Ta,nom

293.15

K

Nominal armature temperature

TaNominal

Nominal Resistances And Inductances Parameters

Name

Default

Units

Description

Modelica ID

αa

0

1K

Temperature coefficient of armature resistance

alpha20a

La

0.0015

H

Armature inductance

La

Ra

0.05

Ω

Warm armature resistance

Ra

Ta,ref

293.15

K

Reference temperature of armature resistance

TaRef

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

DC Machines

Electrical Library

Electrical Machines