Electromechanical actuator for driving a closure or sun protection screen, closure or sun protection system comprising such an actuator and method for dimensioning a compensation spring for a range of blinds each incorporating such an actuator

An electromechanical actuator for driving a mobile closure or sun protection screen, the electromechanical actuator comprising:

• a control board;
• a gear reduction assembly;
• a connector configured to link to a power supply source, the connector comprising eight electrical contacts configured to power the electromechanical actuator and to transmit data from an Ethernet network to the control board;
• and
• a synchronous motor comprising a wound stator and a rotor with permanent magnets, the synchronous motor receiving a power voltage of 36V to 57V supplied through said connector through a wired Ethernet link from the Ethernet network without conversion of said power voltage, a winding of the stator being configured to operate at the power voltage of between 36V and 57V,
• wherein the control board comprises:
• a control unit configured to drive the synchronous motor, and
• a power supply circuit comprising a controller circuit configured to receive commands transmitted from the Ethernet network through the connector and configured to interface with the control unit, the controller circuit comprising a voltage converter configured to reduce an input voltage provided by the Ethernet network to the controller circuit to below 10V to power electronic components of the controller circuit without affecting the power voltage supplied to the synchronous motor.