Abstract: A vector-control system and method of a “sensorless” type for electric drives with a.c. motors is based upon generation of an oscillating magnetic field and upon measurement of the deviation, with respect to said oscillating field, of the flux generated thereby on account of anisotropy, whether natural or induced, of the magnetic structure of the machine.

Abstract: A vector-control system and method of a “sensorless” type for electric drives with a.c. motors is based upon generation of an oscillating magnetic field and upon measurement of the deviation, with respect to said oscillating field, of the flux generated thereby on account of anisotropy, whether natural or induced, of the magnetic structure of the machine.

Abstract: A driving circuit for electronically switched motors is provided. The driving circuit includes a supply voltage rectifying stage for providing a rectified supply voltage, first switching means for switching state based on output of a first control block, magnetic means for providing a magnetic flux according to the state of the first switching means, transmission diodes for transmitting an exciting current that flows through the magnetic means, first energy storing means for storing the exciting current, an energy return stage for transferring the energy stored in the first energy storing means to the rectifying stage, and energetic conversion means for receiving the energy stored in the energy storing means through second switching means controlled by a second control block, so as to provide a current as sinusoidal as possible.

Abstract: A system and a method of vector sensorless control for electrical drives with induction motors, based on the generation of a high frequency rotating magnetic field which, by composing with the main magnetic field, produces a change of the saturation level as a function of the relative positions taken during the motion. Variation of the saturation level produces a modulation of the zero sequence component of the stator voltage, which is used to evaluate the position of the main field.

Abstract: A driving circuit for electronically switched motors is provided. The driving circuit includes a supply voltage rectifying stage for providing a rectified supply voltage, first switching means for switching state based on output of a first control block, magnetic means for providing a magnetic flux according to the state of the first switching means, transmission diodes for transmitting an exciting current that flows through the magnetic means, first energy storing means for storing the exciting current, an energy return stage for transferring the energy stored in the first energy storing means to the rectifying stage, and energetic conversion means for receiving the energy stored in the energy storing means through second switching means controlled by a second control block, so as to provide a current as sinusoidal as possible.