Modelica.Electrical.Machines.Examples.DCMachines

Test examples of DC machines

Information

This package contains test examples of DC machines.

Extends from Modelica.Icons.ExamplesPackage (Icon for packages containing runnable examples).

Package Content

Name	Description
DCPM_Start	Test example: DC with permanent magnet starting with voltage ramp
DCEE_Start	Test example: DC with electrical excitation starting with voltage ramp
DCSE_Start	Test example: DC with serial excitation starting with voltage ramp
DCSE_SinglePhase	Test example: DC with serial excitation starting with voltage ramp
DCPM_Temperature	Test example: Investigate temperature dependency of a DCPM motor
DCPM_Cooling	Test example: Cooling of a DCPM motor
DCPM_QuasiStationary	Test example: Compare DCPM motors transient - quasistationary
DCPM_withLosses	Test example: Investigate influence of losses on DCPM motor performance

Modelica.Electrical.Machines.Examples.DCMachines.DCPM_Start

Test example: DC with permanent magnet starting with voltage ramp

Information

Test example: Permanent magnet DC machine started with an armature voltage ramp
A voltage ramp is applied to the armature, causing the DC machine to start, and accelerating inertias.
At time tStep a load step is applied.
Simulate for 2 seconds and plot (versus time):

dcpm.ia: armature current
dcpm.wMechanical: motor's speed
dcpm.tauElectrical: motor's torque

Default machine parameters of model DC_PermanentMagnet are used.

Extends from Modelica.Icons.Example (Icon for runnable examples).

Parameters

Name Description

Va Actual armature voltage [V]

tStart Start of armature voltage ramp [s]

tRamp Armature voltage ramp [s]

TLoad Nominal load torque [N.m]

tStep Time of load torque step [s]

JLoad Load's moment of inertia [kg.m2]

dcpmData

Name	Description
Va	Actual armature voltage [V]
tStart	Start of armature voltage ramp [s]
tRamp	Armature voltage ramp [s]
TLoad	Nominal load torque [N.m]
tStep	Time of load torque step [s]
JLoad	Load's moment of inertia [kg.m2]
dcpmData

Modelica.Electrical.Machines.Examples.DCMachines.DCEE_Start

Test example: DC with electrical excitation starting with voltage ramp

Information

Test example: Electrically separate excited DC machine started with an armature voltage ramp
A voltage ramp is applied to the armature, causing the DC machine to start, and accelerating inertias.
At time tStep a load step is applied.
Simulate for 2 seconds and plot (versus time):

dcee.ia: armature current
dcee.wMechanical: motor's speed
dcee.tauElectrical: motor's torque
dcee.ie: excitation current

Default machine parameters of model DC_ElectricalExcited are used.

Extends from Modelica.Icons.Example (Icon for runnable examples).

Parameters

Name Description

Va Actual armature voltage [V]

tStart Start of armature voltage ramp [s]

tRamp Armature voltage ramp [s]

Ve Actual excitation voltage [V]

TLoad Nominal load torque [N.m]

tStep Time of load torque step [s]

JLoad Load's moment of inertia [kg.m2]

dceeData

Name	Description
Va	Actual armature voltage [V]
tStart	Start of armature voltage ramp [s]
tRamp	Armature voltage ramp [s]
Ve	Actual excitation voltage [V]
TLoad	Nominal load torque [N.m]
tStep	Time of load torque step [s]
JLoad	Load's moment of inertia [kg.m2]
dceeData

Modelica.Electrical.Machines.Examples.DCMachines.DCSE_Start

Test example: DC with serial excitation starting with voltage ramp

Information

Test example: Series excited DC machine started with a series resistor
At constant source voltage, a series resistor limiting the armature current, is reduced according to a ramp, causing the DC machine to start, and accelerating inertias against load torque quadratic dependent on speed, finally reaching nominal speed.
Simulate for 2 seconds and plot (versus time):

dcse.ia: armature current
dcse.wMechanical: motor's speed
dcse.tauElectrical: motor's torque

Default machine parameters of model DC_SeriesExcited are used.

Extends from Modelica.Icons.Example (Icon for runnable examples).

Parameters

Name Description

Va Actual armature voltage [V]

tStart Start of resistance ramp [s]

tRamp Resistance ramp [s]

TLoad Nominal load torque [N.m]

wLoad Nominal load speed [rad/s]

JLoad Load's moment of inertia [kg.m2]

dcseData

Name	Description
Va	Actual armature voltage [V]
tStart	Start of resistance ramp [s]
tRamp	Resistance ramp [s]
TLoad	Nominal load torque [N.m]
wLoad	Nominal load speed [rad/s]
JLoad	Load's moment of inertia [kg.m2]
dcseData

Modelica.Electrical.Machines.Examples.DCMachines.DCSE_SinglePhase

Test example: DC with serial excitation starting with voltage ramp

Information

Test example: Series excited DC machine at singlephase AC voltage started with a series resistor
At sinusoidal source voltage, a series resistor limiting the armature current, is reduced according to a ramp, causing the DC machine to start, and accelerating inertias against load torque quadratic dependent on speed, finally reaching nominal speed.
Simulate for 2 seconds and plot (versus time):

dcse.ia: armature current
dcse.wMechanical: motor's speed
dcse.tauElectrical: motor's torque

Default machine parameters of model DC_SeriesExcited are used.
Note:
Since both the field and the armature current are sinusoidal, the waveform of the torque is the square of sine. Due to the additional inductive voltage drops, output of the motor is lower, compared to the same motor (DCSE_Start) at DC voltage.

Extends from Modelica.Icons.Example (Icon for runnable examples).

Parameters

Name Description

Va Actual armature voltage RMS [V]

tStart Start of resistance ramp [s]

tRamp Resistance ramp [s]

TLoad Nominal load torque [N.m]

wLoad Nominal load speed [rad/s]

JLoad Load's moment of inertia [kg.m2]

dcseData

Name	Description
Va	Actual armature voltage RMS [V]
tStart	Start of resistance ramp [s]
tRamp	Resistance ramp [s]
TLoad	Nominal load torque [N.m]
wLoad	Nominal load speed [rad/s]
JLoad	Load's moment of inertia [kg.m2]
dcseData

Modelica.Electrical.Machines.Examples.DCMachines.DCPM_Temperature

Test example: Investigate temperature dependency of a DCPM motor

Information

Test example: Investigate influence of armature temperature on a DCPM motor
The motor starts at no-load speed, then a load step is applied.
Beginning with the load step, the armature temperature rises exponentially from 20 degC to 80 degC.
Simulate for 3 seconds and plot (versus time):

dcpm.ia: armature current
dcpm.wMechanical: motor's speed
dcpm.tauElectrical: motor's torque
thermalAmbientDCPM.Q_flow_a: motor's armature losses

Default machine parameters are used, but:

The armature winding material is set to Copper.
Armature reference temperature is set to 80 degC.
Nominal armature temperature is set to 80 degC.

So the machine is at the beginning in cold condition, ending in warm condition (with the same armature resistance as the unmodified machine).

Extends from Modelica.Icons.Example (Icon for runnable examples).

Parameters

Name Description

Va Actual armature voltage [V]

Ve Actual excitation voltage [V]

w0 No-load speed [rad/s]

TLoad Nominal load torque [N.m]

JLoad Load's moment of inertia [kg.m2]

dcpmData

Name	Description
Va	Actual armature voltage [V]
Ve	Actual excitation voltage [V]
w0	No-load speed [rad/s]
TLoad	Nominal load torque [N.m]
JLoad	Load's moment of inertia [kg.m2]
dcpmData

Modelica.Electrical.Machines.Examples.DCMachines.DCPM_Cooling

Test example: Cooling of a DCPM motor

Information

Test example: Demonstrate cooling of a DCPM motor
The motor starts at no-load speed, then load pulses are applied.
The cooling circuit consists of armature's thermal capacitance, a thermal conductance between armature and core, core's thermal capacitance and a thermal conductance between core and coolant. The coolant flow circuit consists of inlet, volume flow, a pipe connected to the core and the outlet.
Please note:

All unused heat ports of the thermal port (i.e., without loss sources in the machine: brush, stray, friction, permanent magnet) have to be connected to a constant temperature source.
The thermal capacitances (i.e., time constants) are unusual small to provide short simulation time!
The coolant is a theoretical coolant with specific mass = 1 kg/m3 and cp = 1 J/kg.K.
The thermal conductances as well as the coolant flow are parametrized such way, that:

the total coolant's temperature rise is 10 K (over coolant inlet)
the core's temperature rise is 27.5 K (over coolant's average temperature between inlet and outlet)
the armature's temperature rise is 55 K (over coolant's average temperature between inlet and outlet)

Simulate for 25 seconds and plot (versus time):

armature.T: armature temperature
core.T: core temperature
cooling.T: coolant temperature at outlet

Therefore the armature temperature would reach nominal armature temperature at constant nominal load.
Default machine parameters are used, but:

The armature winding material is set to Copper.
Armature reference temperature is set to 80 degC.
Nominal armature temperature is set to 80 degC.

Extends from Modelica.Icons.Example (Icon for runnable examples).

Parameters

Name Description

Va Actual armature voltage [V]

Ve Actual excitation voltage [V]

w0 No-load speed [rad/s]

TLoad Nominal load torque [N.m]

JLoad Load's moment of inertia [kg.m2]

TAmbient Ambient temperature [K]

Ca Armature's heat capacity [J/K]

Cc Core's heat capacity [J/K]

G_armature_core Heat conductance armature - core [W/K]

G_core_cooling Heat conductance core - cooling [W/K]

CoolantFlow Coolant flow [m3/s]

dcpmData

Name	Description
Va	Actual armature voltage [V]
Ve	Actual excitation voltage [V]
w0	No-load speed [rad/s]
TLoad	Nominal load torque [N.m]
JLoad	Load's moment of inertia [kg.m2]
TAmbient	Ambient temperature [K]
Ca	Armature's heat capacity [J/K]
Cc	Core's heat capacity [J/K]
G_armature_core	Heat conductance armature - core [W/K]
G_core_cooling	Heat conductance core - cooling [W/K]
CoolantFlow	Coolant flow [m3/s]
dcpmData

Modelica.Electrical.Machines.Examples.DCMachines.DCPM_QuasiStationary

Test example: Compare DCPM motors transient - quasistationary

Information

Test example: Compare DCPM motors transient and quasistationary
The motors start at no-load speed, then load pulses are applied.
Simulate for 2 seconds and plot (versus time):

dcpm1.ia: armature current of transient model
dcpm1.wMechanical: motor's speed of transient model
dcpm1.tauElectrical: motor's torque of transient model
dcpm2.ia: armature current of quasistationary model
dcpm2.wMechanical: motor's speed of quasistationary model
dcpm2.tauElectrical: motor's torque of quasistationary model

Extends from Modelica.Icons.Example (Icon for runnable examples).

Parameters

Name Description

Va Actual armature voltage [V]

Ve Actual excitation voltage [V]

w0 No-load speed [rad/s]

TLoad Nominal load torque [N.m]

JLoad Load's moment of inertia [kg.m2]

dcpmData

Name	Description
Va	Actual armature voltage [V]
Ve	Actual excitation voltage [V]
w0	No-load speed [rad/s]
TLoad	Nominal load torque [N.m]
JLoad	Load's moment of inertia [kg.m2]
dcpmData

Modelica.Electrical.Machines.Examples.DCMachines.DCPM_withLosses

Test example: Investigate influence of losses on DCPM motor performance

Information

Test example: Investigate influence of losses on DCPM motor performance
Both motors are started with a voltage ramp applied to the armature, causing the DC machines to start, and accelerating inertias. Both machines are loading with a quadratic speed dependent load torque.
The first machine dcpm1 uses default machine parameters of model DC_PermanentMagnet, the second machine dcpm2 is parametrized with additional losses:

	dcpm1	dcpm2
Armature voltage	100	100	V
Armature current	100	100	A
Inner voltage	95.0	94.5	V
Nominal speed	1425.0	1417.5	rpm
Armature resistance	0.05000	0.03864	Ohm
Temperature coefficient	n/a	0.00392	1/K
Reference temperature	n/a	20	degC
Operation temperature	n/a	95	degC
Brush voltage drop	n/a	0.5	V
Electrical input	10,000	10,000	W
Armature copper losses	500	500	W
Core losses	n/a	200	W
Stray load losses	n/a	50	W
Friction losses	n/a	100	W
Brush losses	n/a	50	W
Mechanical output	9,500	9,100	W
Nominal torque	63,66	61,30	Nm

Note: The reference values (voltage, current, speed) are already propagated to the loss records, using the nominal operation point.
See:
Anton Haumer, Christian Kral, Hansjörg Kapeller, Thomas Bäuml, Johannes V. Gragger
The AdvancedMachines Library: Loss Models for Electric Machines
Modelica 2009, 7^th International Modelica Conference

Extends from Modelica.Icons.Example (Icon for runnable examples).

Parameters

Name Description

Va Actual armature voltage [V]

tStart Start of armature voltage ramp [s]

tRamp Armature voltage ramp [s]

TLoad1 Nominal load torque [N.m]

wLoad1 Nominal load speed [rad/s]

TLoad2 Nominal load torque [N.m]

wLoad2 Nominal load speed [rad/s]

JLoad Load's moment of inertia [kg.m2]

dcpmData1

dcpmData2

Name	Description
Va	Actual armature voltage [V]
tStart	Start of armature voltage ramp [s]
tRamp	Armature voltage ramp [s]
TLoad1	Nominal load torque [N.m]
wLoad1	Nominal load speed [rad/s]
TLoad2	Nominal load torque [N.m]
wLoad2	Nominal load speed [rad/s]
JLoad	Load's moment of inertia [kg.m2]
dcpmData1
dcpmData2

Automatically generated Mon Sep 23 17:20:29 2013.