System of controlling induction electric motor

A system of controlling an induction electric motor, comprising:

• an input unit configured to receive a command speed for operating an induction electric motor at a high speed above a preset speed;
• a command voltage output unit configured to generate a command voltage for operating an inverter based on the received command speed and configured to output the generated command voltage to the inverter;
• a control unit configured to control the command voltage output unit such that the command voltage output to the inverter is compared with a preset operation limiting voltage and correct the generated command voltage to fall within the preset operation limiting voltage, depending on a result of the comparison;
• a vector control system for receiving the command speed, calculating the command voltage according to the command speed received, correcting the command voltage calculated, through vector control, and outputting the command voltage corrected through the vector control to the inverter;
• and
• the inverter configured to control the induction electric motor at the high speed depending on the corrected command voltage,
• wherein when the command voltage output to the inverter is determined to be smaller than the preset driving limitation voltage, the control unit allows the command voltage output through the vector control system to go into the inverter and blocks the command voltage output from the command voltage output unit.