DEVICE FOR CONTROLLING DOUBLE-FED MOTOR Russian patent published in 2017 - IPC H02P1/30 H02P27/05 H02P21/13 

FIELD: electricity.

SUBSTANCE: in device for controlling double-fed motor, comprising an asynchronous motor with a phase rotor, transformers of stator and rotor frequency, a sensor of stator phase currents, a phase number converter of the stator, an observer of resulting magnetic flux, a trigonometric analyser, an inverse converter of the coordinates of the stator currents, two sine-cosine converters, an inverse converter of the coordinates of the rotor currents, a phase number converter of the rotor, sensors of the rotor currents, a switch of magnetic flux setting, a regulator of resulting magnetic flux, an EMF compensation unit of the rotor, a direct converter of the coordinates of the rotor voltages, a unit of the voltage amplitude settings of the rotor, a rotor frequency converter, an excitation frequency regulator, a master of the angular rotor speed, an angular rotor speed regulator, an evaluation unit of the angular rotor speed, a frequency sensor of the stator currents, a sensor of the stator phase voltages, a functional converter, a unit for setting parameters, a regulator of the stator current component i_sy, a switch of the magnetic flux setting, a regulator of the stator current component i_sy, an EMF compensation unit of the stator, a direct converter of the coordinates of the stator voltages, a unit for the stator voltage amplitude settings, an integrator, a multiplier, an adder, a frequency sensor of the stator currents, first three arithmetic units, an evaluation unit of the angular rotor speed, a frequency comparator, a master oscillator of a two-phase harmonic signal, a controlled analogue switch, an evaluation unit of the frequency currents of the rotor, a divider, a sensor of the phase rotor voltages; a logical switching unit, a second observer of the resulting magnetic flux, a second trigonometric analyzer are additionally introduced, and the phase number converter of the rotor has an additional second input and additional third and fourth outputs. The newly introduced elements are connected to the elements and units of the device, as indicated in the claim. The use of the proposed invention makes it possible to create an electric drive based on a series asynchronous motor with a phase rotor, connected by a double-feed scheme, allowing for heavy restartings, having hard mechanical properties, high energy indices in a wide range of changing the rotation frequency and the shaft loads due to changing the magnetic motor state in the electromagnetic moment function, and the excitation frequency in the a given rotor speed function, the deep and smooth adjustment of the rotor rotation frequency by means of changing the stator voltage is analogous to an electric drive with a DC motor.

EFFECT: providing the sensorless identification of the magnetic flux of the air gap and minimum losses in the entire range of loads.

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