| 摘要 |
The present invention relates to a driving method of a synchronous electric motor, particularly to start a fan/exhaust fan, and providing at least a measuring step of the supply voltage value of the electric motor windings being proportional to the mass flow rate. The method provides at least the following steps: measuring a real load angle (¸ car ), by means of a signal coming from a Hall sensor (20) associated to the motor rotor; performing a comparison with an optimal load angle (¸ ott ) corresponding to a reference mass flow rate (P target ) of the sucked fluid; changing the voltage value (Vwindings) and the operating frequency (f) applied to the electric motor up to reach a value of the real load angle (¸ car ) corresponding to said optimal load angle value (¸ ott ). |
