Patents by Inventor Diego Torriani

Diego Torriani has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Control circuit for a permanent magnet or constant excitation direct current motor, particularly for washing machines
    Patent number: 4965848
    Abstract: A motor control circuit measures the motor voltage to determine actual motor speed. This speed voltage is the sum of the back emf and armature loses. The control circuit receives a reference voltage proportional to the desired motor speed and a further signal voltage indicative of the motor armature losses. These three voltages are combined to provide a first error signal representing the difference between the reference voltage and the motor back emf. This error signal is substractively combined with a signal representative of the motor power to produce a control signal for a modulator circuit which in turn controls a semiconductor switch in series with the motor.
    Type: Grant
    Filed: March 3, 1989
    Date of Patent: October 23, 1990
    Assignee: Whirlpool International B.V.
    Inventors: Enrico Vasconi, Carlo Mazzucchelli, Diego Torriani, Mario Giganti