ALTERNATING CURRENT DRIVE Russian patent published in 2010 - IPC H02P27/04 H02P27/06 

FIELD: electricity.

SUBSTANCE: to ac drive there is introduced adaptive control of magnetising current correction, which shapes magnetising current vector by forming instantaneous values the amplitude and frequency of which depend on the magnetising current setting. By changing the frequency, there achieved is formation of optimum, from the point of view of stator current consumption minimisation, angle between current vectors of stator and magnetising current which is equal to 45°. Retention of magnetising current is performed by introducing phase control the outputs of which are connected to control inputs of PWM current control. Inverter shaped phase currents of stator with frequency and amplitude required for forming of the specified value of moment subject on condition of minimisation of stator current consumption from the network and more complete use of magnetic conductor. Electric drive operates with actual three-phase system of coordinates, which will allow avoiding all possible coordinate converters complicating the calculation and enlarging requirements for controller.

EFFECT: improving power and dynamic properties.

5 dwg