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+#ifndef motor_model_host_h
+#define motor_model_host_h
+/* motor_model.host.h - DC motor model. */
+/* asserv - Position & speed motor control on AVR. {{{
+ *
+ * Copyright (C) 2006 Nicolas Schodet
+ *
+ * Robot APB Team/Efrei 2006.
+ * Web: http://assos.efrei.fr/robot/
+ * Email: robot AT efrei DOT fr
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * }}} */
+
+/** Motor and load caracteristics and current data. */
+struct motor_t
+{
+ /* Motor caracteristics. */
+ double Ke; /* Speed constant ((rad/s)/V). */
+ double Kt; /* Torque constant (N.m/A). */
+ double Rf; /* Bearing friction (N.m/(rad/s)). */
+ double R; /* Terminal resistance (Ohm). */
+ double L; /* Terminal inductance (H). */
+ /* Gearbox caracteristics. */
+ double i_G; /* Gearbox ratio. */
+ double ro_G;/* Gearbox efficiency. */
+ /* Load caracteristics. */
+ double J; /* Load (kg.m^2). */
+ /* Wheel caracteristics. */
+ double w_r; /* Wheel radius (m). */
+ /* Simulation parameters. */
+ double h; /* Simulation time step (s). */
+ int d; /* Simulation time step division. */
+ /* Simulation current state. */
+ double t; /* Current time (not realy used) (s). */
+ double u; /* Current input voltage (V). */
+ double i; /* Current current (A). */
+ double o; /* Current angular speed (o for omega) (rad/s). */
+ double th; /* Current theta (th for theta) (rad). */
+};
+
+/** Make a simulation step. */
+void motor_model_step (struct motor_t *m);
+
+#endif /* motor_model_host_h */