Method for making a motor quieter

A method for making an electric motor more efficient, comprising:

• providing an electric motor having a rotor being rotatable in a first direction relative to a stator winding, a first and a second transistor electrically connected to the stator winding and to a processor, the rotor having magnets of first and second polarities separated at polarity changing points;
• a sensor sensing a first polarity changing point, the sensor sending a first triggering signal to the processor;
• upon receipt of the first triggering signal, the processor delaying by a time period (t1) before sending a first activation signal to the first transistor to start rotating the rotor in the first direction, the first activation signal lasting for a time period (I1);
• the processor measuring a current A1 driving the electric motor at a rotational speed;
• the sensor sensing a second polarity changing point, the sensor sending a second triggering signal to the processor;
• upon receipt of the second triggering signal, the processor delaying by a time period (t1′) before sending a second activation signal to the second transistor to continue rotating the rotor in the first direction, the second activation signal lasting for a time period (I2);
• the processor measuring a current A2 driving the electric motor at the rotational speed;
• the processor comparing the current A1 to the current A2 and selecting time period (t1) for sending activation signals when the current A2 is greater than the current A1 and selecting time period (t1′) for sending activation signals when the current A1 is greater than the current A2;
• and
• the processor iteratively changing the time period (t1) for each activation signal sent until a minimum current Amin is found by comparing measured currents to optimize an efficiency of the electric motor.