Patent ID: 8519651

Claim:
A system to control an asynchronous tri-phase motor, said system comprising: a) a filter coupled to respective Alternative Current (AC) lines to filter line current; b) a rectifier coupled to the filter to receive the filtered line current and output a rectified line current; c) a voltage multiplier which increases a voltage level of the rectified line current and outputs a Direct Current (DC) voltage; d) at least one braking resistance coupled to receive output voltage from the voltage multiplier to dissipate energy when the system is in a braking mode; e) at least one resistance shunt effective to measure current which flows in a line from the voltage multiplier to an IGBT module; f) a voltage source coupled to adapt the output voltage from the voltage multiplier to energize at least a microcontroller; g) a line regulator coupled to the voltage source to remove curls and noise; h) the microcontroller configured to process, receive and emit control signals; i) a module to emit a pulse train comprising Pulse Width Modulation (PWM) and having a frequency selectively adjusted by the microcontroller, the module operatively coupled to apply the pulse train to an H bridge circuit in the IGBT module; j) the IGBT module coupled to pass the output voltage from the voltage multiplier to the tri-phase, asynchronous motor in response to the PWM pulse train applied to the H bridge circuit in the IGBT module; k) a retro-feeding line coupled to the microcontroller to measure current; and l) at least one pulse detector mechanically coupled to the tri-phase motor to sense rotation information of a rotor of the motor, the pulse detector arranged to supply to the microcontroller a signal or pulse train indicative of the sensed rotation information.