AIR CONDITIONING VALVE ACTUATOR FOR MOTOR VEHICLE

摘要

The invention concerns an air conditioning valve for a motor vehicle operating on an electric step motor with permanent magnet capable of delivering mechanical power at least equal to 50 mW, and a reduction unit for decreasing the amplitude of the angular pitch and increase the output torque. The motor is defined by the following relationship: 10<E>-6 < gamma <2>/Ro < 50<E>-6, wherein: gamma is the torque constant expressed in Nm/At, proportional to the magnet volume and, Ro is the characteristic coefficient of copper and the length of the average turn of the coils, expressed in Ohms/tr<2>, Ro = rho .Lsp/(Scu. sigma ), rho being the resistivity of copper, Lsp being the length of the average turn of a coil Scu the copper section of a coil and sigma being the filling coefficient of a coil; and it comprises means for controlling the motor power supply enabling to accelerate gradually the frequency of the supply of the windings to reach a working frequency of the motor higher than the start-stop starting frequency.