Abstract: An enhanced torque ripple mitigation algorithm for permanent magnet synchronous machines (PMSMs), the algorithm including compensation for sensor delay.

Abstract: Disclosed is a frequency converter system for altering the frequency of a-c power supplied from a distribution network to a load, the system including a pair of mechanically coupled rotating alternating current machines, the alteration of the rate and direction of rotation of the prime mover altering the frequency of the power. A variable impedance network comprising saturable core reactors and connected in the rotor circuit of the prime mover is utilized to effect the change of rate and direction of prime mover rotation.

Abstract: A system for determining the relative angular positions of two magnetic-p rotors of respective synchronously driven (same speed) synchronous motors operated from a common frequency generator applying the driving frequency to the motors. Each rotor is provided with an optoelectronic device generating an electronic pulse for each revolution of the rotor. The pulse of one optoelectronic device is applied to the start input of a start-stop counter. The pulse from the other device is applied to the stop input of the counter and the pulse-counting input receives its signals from a frequency multiplier connected to the frequency generator.