Patent ID: 8508162
Filing Date: 2013-08-13
Classification: B60L,H02P,Y02T

Abstract:
1. A system for controlling torque of induction motor in electric vehicle, the system comprising: a current command unit outputting d axis and q axis current commands (i* d , i* q ) of stationary reference frame from a power command and a rotation speed (ω) of the induction motor using a two dimensional look-up table, and outputting a mutual inductance (Lm) and a rotor torque (Tr) using an one dimensional look-up table based on the outputted d axis current command (i* d ); a flux/current controller receiving the mutual inductance (Lm) and a rotor torque (Tr) from the current command unit to control a flux of the induction motor and to calculate a slip of a rotor, and based on which, to output d axis and q axis voltage command (V* dq ) relative to the d axis and q axis current commands (i* d , i* q ) from the current command unit; a PWM (Pulse Width Modulation)/gate driver receiving the d axis and q axis current commands (i* d , i* q ) from the flux/current controller to modulate a pulse width and output a gate driving voltage of a transistor; and an inverter receiving the output from the PWM/gate driver to output an AC voltage for driving the induction motor.