Patent ID: 8258641
Filing Date: 2012-09-04
Classification: H02K,H02P

Abstract:
1. A method for producing an alternating electric current with a regulated frequency from a prime mover having a variable speed, the method comprising: actuating an alternator rotor by transmitting a rotation motion of the prime mover to the rotor, a rotation speed of the rotor varying with the variable speed of the prime mover; producing the alternating current by the rotation of the rotor relative to an alternator stator, a frequency of the alternating current being given by a relative speed between the rotor and the stator; rotating the stator relative the rotor by driving the stator with an auxiliary machine to regulate the relative speed between the rotor and the stator, the rotation speed of the stator being given by the speed of the auxiliary machine, the rotor and stator rotating about a common axis, including rotating the stator in a direction of rotation of the rotor when the rotation speed of the rotor is above a given speed and in a direction opposite to the direction of rotation of the rotor when the speed of the rotor is below the given speed; and controlling the rotation of the stator to maintain said frequency to said regulated frequency while the rotation speed of the rotor varies.