Abstract: The ventilation apparatus (20) according to the invention comprises a fan (30) including a rotary machine (32) and a fan wheel (34), an observation module, a module for connecting the device (20) to a power source (12), the fan wheel (34) being set in rotation by the rotary machine (32) when the apparatus (20) is connected to the power source (12), and rotating freely when the apparatus (20) is disconnected from the power source (12). The device (20) further includes an internal power module electrically connected between the rotary machine (32) and the observation module, the internal power module being able to recover an electric current generated by the rotary machine (32) driven by the fan wheel (34), to power the observation module (62), when the apparatus (20) is disconnected from the power source (12).

Abstract: The ventilation apparatus (20) according to the invention comprises a fan (30) including a rotary machine (32) and a fan wheel (34), an observation module, a module for connecting the device (20) to a power source (12), the fan wheel (34) being set in rotation by the rotary machine (32) when the apparatus (20) is connected to the power source (12), and rotating freely when the apparatus (20) is disconnected from the power source (12). The device (20) further includes an internal power module electrically connected between the rotary machine (32) and the observation module, the internal power module being able to recover an electric current generated by the rotary machine (32) driven by the fan wheel (34), to power the observation module (62), when the apparatus (20) is disconnected from the power source (12).

Abstract: The invention relates to an underspeed detection device (2) for a motor (4) comprising a stator and a rotor movable relative to the stator, the detection device (2) comprising detection means (12) able to generate an electric rotation signal (ir) representative of the speed of rotation of the rotor, and electronic analysis means (20) able to analyze the rotation signal (ir) to detect an underspeed situation, characterized in that the detection device (2) further comprises conversion means (18) able to convert part (ip) of the electric rotation signal (ir) into a power supply current (ial) for the analysis means (20), and means for applying the power supply current (ial) to the analysis means (20) for their electric power supply.