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.
Generated at 2020-06-05T21:39:08Z by OpenModelica 1.16.0~dev-442-g2e5bc9f
.Modelica.Electrical.Machines.Examples.DCMachines.DCPM_Cooling