System for controlling motor and method for the same

A method for controlling a motor, comprising the steps of:

• a) generating a difference between a reference speed and an estimated speed of the motor;
• b) generating a reference torque current for controlling a motor speed according to the speed difference generated at the step (a) simultaneously controlling a magnetic flux according to the estimated speed of the motor, and generating a reference magnetic flux current;
• c) generating a difference between the reference magnetic flux current and a real magnetic flux current simultaneously with generating a difference between the reference torque current and a real torque current of the motor, and thus compensating ripples that are generated in the reference torque current generated at the step (b) by the motor;
• d) generating a reference magnetic flux voltage and a reference torque voltage according to individual differences generated at the step (c), and transmitting the reference magnetic flux and the reference torque voltage to a three-phase voltage generator adapted to output a three-phase voltage to an inverter driving the motor;
• and
• e) allowing the inverter to control the motor upon receiving the three-phase voltage generated at step (d).

A method for controlling a motor, comprising the steps of:

• a) generating a difference between a reference speed and an estimated speed of the motor in order to compensate a ripple component generated in the estimated speed due to loads of the motor;
• b) generating a reference torque current for controlling a motor speed according to the speed difference generated at the step (a) simultaneously controlling a magnetic flux according to the estimated speed of the motor, and generating a reference magnetic flux current;
• c) generating a difference between the reference magnetic flux current and a real magnetic flux current simultaneously with generating a difference between the reference torque current and a real torque current of the motor;
• d) generating a reference magnetic flux voltage and a reference torque voltage according to individual differences generated at the step (c), and transmitting the reference magnetic flux and the reference torque voltage to a three-phase voltage generator adapted to output a three-phase voltage to an inverter driving the motor;
• and
• e) allowing the inverter to control the motor upon receiving the three-phase voltage generated at step (d).