DC Machine
Purpose
Simple model of DC machine
Library
Electrical / Machines
Description
The machine operates as a motor or generator; if the mechanical torque has the same sign as the rotational speed the machine is operating in motor mode, otherwise in generator mode. In the component icon, the positive poles of armature and field winding are marked with dots.
Electrical System
Electromagnetic torque:
Induced voltage of the armature winding:
Mechanical System
Parameters
- Armature resistance
- Armature winding resistance
in ohms (
).
- Armature inductance
- Armature winding inductance
in henries (H).
- Field resistance
- Field winding resistance
in ohms (
).
- Armature inductance
- Field winding inductance
in henries (H).
- Field-armature mutual inductance
- Field-armature mutual inductance
in henries (H).
- Inertia
- Combined rotor and load inertia
in
.
- Friction coefficient
- Viscous friction
in Nms.
- Number of pole pairs
- Number of pole pairs
.
- Initial rotor speed
- Initial mechanical speed
in radians per second (
).
- Initial armature current
- Initial current
in the armature winding in amperes (A).
- Initial field current
- Initial current
in the field winding in amperes (A).
Inputs and Outputs
- Mechanical torque
- The input signal
represents the mechanical torque at the rotor shaft, in Nm.
The output vector “m” contains the following 2 signals:
- (1) Rotor speed
- The rotational speed
of the rotor in radians per second (
).
- (2) Electrical torque
- The electrical torque
of the machine in Nm.