Electric motorization system with a preheating function for protecting the motor thereof against the condensation

A method for protecting against the condensation in a motor of an electric motorization system, wherein the electric motorization system comprises:

• a motorized unit equipped with the motor, the motor provided with a rotor and stator assembly including several coils, and a frequency converter which is electrically powered by a power supply, the motor driven in rotational speed by the frequency converter which powers the coils of the motor with a variable frequency electric current;
• and
• a monitoring/control unit configured to control the frequency converter for turning on the motor in a variable speed operating mode, or for turning off the motor,
• wherein the motorized unit comprises a motor brake which is connected to the monitoring/control unit and configurable between an open configuration during the turning on of the motor to enable a rotation of the motor and a closed configuration blocking the rotation of the motor when the motor is turned off, the method comprising:
• measuring at least one condensation parameter representative of a condensation of the water contained in ambient air;
• controlling, by the monitoring/control unit, the frequency converter depending on the at least one condensation parameter, during the turning off of the motor, so that a preheating electric current flows through the coils for a preheating of the motor when the motor is turned off;
• and
• controlling, by the monitoring/control unit, the motor brake in the open configuration during the turning on of the motor, and in the closed configuration when the motor is turned off, whether or not the preheating is activated.

An electric motorization system comprising:

• a motorized unit equipped with a motor provided with a rotor and stator assembly including several coils, and a frequency converter electrically powered by a power supply, the motor driven in rotational speed by the frequency converter which powers the coils of the motor with a variable frequency electric current;
• a monitoring/control unit configured to control the frequency converter for turning on the motor in a variable speed operating mode, or for turning off the motor;
• and
• a measurement system configured to measure at least one condensation parameter representative of a condensation of water contained in an ambient air,
• wherein the monitoring/control unit is connected to the measurement system and is configured to, depending on the condensation parameter, control the frequency converter during the turning off of the motor so that a preheating electric current flows through the coils to activate a preheating of the motor when the motor is turned off, and
• wherein the motorized unit comprises a motor brake configurable between an open configuration during the turning on of the motor to enable a rotation of the motor and a closed configuration mechanically blocking the rotation of the motor when the motor is turned off, whether or not the preheating is activated.