modelDCPM_Cooling

Test example: Cooling of a DCPM motor

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

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.

Parameters

Type	Name	Default	Description
SI.Voltage	Va	100	Actual armature voltage
SI.Voltage	Ve	100	Actual excitation voltage
SI.AngularVelocity	w0	Modelica.Units.Conversions.from_rpm(1500)	No-load speed
SI.Torque	TLoad	63.66	Nominal load torque
SI.Inertia	JLoad	0.15	Load's moment of inertia
SI.Temperature	TAmbient	293.15	Ambient temperature
SI.HeatCapacity	Ca	20	Armature's heat capacity
SI.HeatCapacity	Cc	50	Core's heat capacity
SI.Power	Losses	dcpm.Ra*dcpm.IaNominal^2	Nominal Losses
SI.Temperature	T0	293.15	Reference temperature 20 degC
SI.TemperatureDifference	dTCoolant	10	Coolant's temperature rise
SI.TemperatureDifference	dTArmature	dcpm.TaNominal - T0 - dTCoolant/2	Armature's temperature rise over coolant
SI.ThermalConductance	G_armature_core	2*Losses/dTArmature	Heat conductance armature - core
SI.ThermalConductance	G_core_cooling	2*Losses/dTArmature	Heat conductance core - cooling
SI.VolumeFlowRate	CoolantFlow	50	Coolant flow
Utilities.ParameterRecords.DcPermanentMagnetData	dcpmData

Components

Type	Name	Description
Machines.BasicMachines.DCMachines.DC_PermanentMagnet	dcpm	DC machine data
Modelica.Electrical.Analog.Sources.ConstantVoltage	armatureVoltage
Modelica.Electrical.Analog.Basic.Ground	groundArmature
Modelica.Mechanics.Rotational.Components.Inertia	loadInertia
Modelica.Mechanics.Rotational.Sources.Torque	loadTorque
Modelica.Blocks.Sources.Pulse	pulse
Modelica.Thermal.HeatTransfer.Components.HeatCapacitor	armature
Modelica.Thermal.HeatTransfer.Components.ThermalConductor	armatureCore
Modelica.Thermal.HeatTransfer.Components.HeatCapacitor	core
Modelica.Thermal.HeatTransfer.Components.ThermalConductor	coreCooling
Modelica.Thermal.FluidHeatFlow.Sources.Ambient	inlet
Modelica.Thermal.FluidHeatFlow.Sources.VolumeFlow	volumeFlow
Modelica.Thermal.FluidHeatFlow.Components.Pipe	cooling
Modelica.Thermal.FluidHeatFlow.Sources.Ambient	outlet
Modelica.Thermal.HeatTransfer.Sources.FixedTemperature	fixedTemperature