From: Lukáš Jiřiště <redacted>
Date: Tue, 9 Dec 2025 12:34:51 +0000 (+0100)
Subject: Add an EMF model I derived for a DC motor
X-Git-Url: https://git.ljiriste.work/?a=commitdiff_plain;p=emf.git

Add an EMF model I derived for a DC motor
---

75dd035d40d562a19917043b610839d8933ab3e7
diff --git a/emf.mo b/emf.mo
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+package EMF
+
+model EMF
+	import Modelica.Units.SI;
+	parameter SI.ElectricalTorqueConstant	k = 1;
+
+	SI.Voltage			v;
+	SI.Current			i;
+	SI.Angle			phi(start = 1);
+	SI.AngularVelocity	omega;
+	SI.Torque			tau;
+
+	Modelica.Electrical.Analog.Interfaces.PositivePin					p;
+	Modelica.Electrical.Analog.Interfaces.NegativePin					n;
+	Modelica.Mechanics.Rotational.Interfaces.Flange_b	flange;
+
+protected
+	parameter SI.ElectricalTorqueConstant	k_mod = k * 2 /
+	Modelica.Constants.pi;
+
+equation
+	omega = der(phi);
+	tau = k_mod * abs(sin(phi)) * i;
+	v = k_mod * abs(sin(phi)) * omega;
+
+	tau = flange.tau;
+	phi = flange.phi;
+	v = p.v - n.v;
+	0 = p.i + n.i;
+	i = p.i;
+end EMF;
+
+model DCMotor
+	import Elct = Modelica.Electrical.Analog.Basic;
+
+	EMF													emf;
+	Elct.Resistor										resistor(R = 1);
+	Elct.Inductor										inductor(L = 1);
+	Elct.Ground											ground;
+	Modelica.Electrical.Analog.Sources.ConstantVoltage	source(V = 1);
+	Modelica.Mechanics.Rotational.Components.Inertia	inertia(J = 1);
+
+equation
+	connect(source.p, resistor.p);
+	connect(resistor.n, inductor.p);
+	connect(inductor.n, emf.p);
+	connect(emf.n, ground.p);
+	connect(source.n, ground.p);
+	connect(emf.flange, inertia.flange_a);
+end DCMotor;
+
+end EMF;