Patents Assigned to Prodeo AB
  • Motor powered sound emitter
    Patent number: 4805732
    Abstract: In a sound emitter including an emitting piston powered by a three phase asynchronous electric motor, the torque curve of the motor may be adjusted to suit any temperature, causing variations in the emitted resonance frequency by using a motor having its maximum torque at less than half the maximum speed. This may be done by using an alloy of silicon and aluminum in the rotor winding.
    Type: Grant
    Filed: October 28, 1987
    Date of Patent: February 21, 1989
    Assignee: Prodeo AB
    Inventor: Mats Moritz