This information is part of the Modelica Standard Library maintained by the Modelica Association.

Test example: Compare characteristic of DC motors
The motors are started at nominal speed, then load is ramped down. Simulate for 6 seconds and plot dcxx.wMechanical (motor speed) versus dcxx.tauElectrical (motor torque). Default machine parameters are used.

Note that the characteristics of permanent magnet and electrical excited dc machine (at nominal excitation) is identical, but speed of the series excited dc machine rises when load torque is lowered. Dynamic increase of speed is determined by the sum of inertias. Load torque of the series excited is not lowered to zero, otherwise speed would rise infinitely.

Va	Value: 100 Type: Voltage (V) Description: Actual armature voltage
Ve	Value: 100 Type: Voltage (V) Description: Actual excitation voltage
TLoad	Value: 63.66 Type: Torque (N·m) Description: Nominal load torque
tStart	Value: 0.5 Type: Time (s) Description: Start of load torque ramp
tRamp	Value: 5.0 Type: Time (s) Description: Load torque ramp
JLoad	Value: 0.15 Type: Inertia (kg·m²) Description: Load's moment of inertia
dcpmData	Value: Type: DcPermanentMagnetData Description: Parameters of permanent magnet dc machine
dceeData	Value: Type: DcElectricalExcitedData Description: Parameters of electrical excited dc machine
dcseData	Value: Type: DcSeriesExcitedData Description: Parameters of series excited dc machine