×

Electric marine propulsion system

  • US 4,661,714 A
  • Filed: 06/17/1985
  • Issued: 04/28/1987
  • Est. Priority Date: 06/17/1985
  • Status: Expired due to Fees
First Claim
Patent Images

1. A marine propulsion system comprising:

  • a diesel engine for providing a continuous rotational shaft horsepower, said diesel engine operated at a speed of maximum efficiency;

    an alternator having a standard rated frequency output for a standard rated input RPM connected to be driven by said diesel engine, said alternator standard rated RPM selected to be less than said generated diesel engine continuous shaft RPM whereby voltage is generated having a higher frequency than said rated standard frequency and said diesel engine and alternator produces a power output at a maximum efficiency;

    a frequency converter connected to receive voltage from said alternator, said frequency converter providing an alternating output voltage having a selectable frequency;

    an AC motor connected to receive a voltage from said frequency converter, said AC motor producing a horsepower output which is constant and a torque proportional to the frequency of said received voltage; and

    gear reduction means for coupling said AC motor and a propeller shaft, whereby said propeller shaft RPM is controlled by said frequency converter output voltage frequency, which may be varied by said frequency converter.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×