Patent ID: 7967573

Claim:
A method for starting a motor with a bidirectional rotation direction, to rotate a fluid circulation centrifugal pump having a predetermined optimum hydraulic efficiency depending on the starting rotation direction thereof, the method comprising the steps of: initially starting the bidirectional motor in either rotation direction without employing electronic or electromechanical components to impose a predetermined rotation direction to said motor, with subsequent pump rotation in the same direction; and periodically interrupting and restoring power fed to the motor to increase the possibility of the motor starting at least one or more times within a predetermined time interval, in the rotation direction which corresponds to said optimum pump predetermined hydraulic efficiency, wherein the number of times that the motor power is interrupted and restored is calculated to ensure, in said predetermined time interval, a predetermined probability of at least 50% that the bidirectional motor is started in the rotation direction corresponding to said centrifugal pump predetermined optimum hydraulic efficiency, and wherein said centrifugal pump has constructive asymmetry to influence said predetermined probability, increasing it to a value comprised between 50% and 99%.