METHOD OF OPTIMUM VECTOR CONTROL OF ASYNCHRONOUS MOTOR Russian patent published in 2010 - IPC H02P21/08 H02P27/04 

FIELD: electricity.

SUBSTANCE: at limitations of output voltage U₀ and current I₀ of power converter feeding the engine, which is typical for controlled drives, especially traction ones, there provided are: minimum losses in engine if at the current value of rotary speed and specified electromagnetic torque M_Z the limitations of maximum allowable values of amplitude of voltage and current at the output of power converter are not reached; conditional minimum of losses in engine at these voltage and current limitation levels at output of power converter if the specified torque M_Z cannot be implemented at optimum sliding value, but is implemented at large sliding values without exceeding voltage and current limitation levels; maximum implemented electromagnetic torque at these voltage and current limitation levels at the output of power converter if the specified torque M_Z cannot be implemented. In vector control method of asynchronous motor with short-circuited rotor fed from power converter, the value of magnetisation current vector mod(i_d) at each time point is equal to value of active current vector mod(i_q), which is divided by proportionality factor k. So at each point of time there met is ratio mod(i_dz)=mod(i_qz)/k; at that, for satisfactory operation of field changing model, value of magnetisation current vector mod(i_d)can be restricted with minimum allowable value mod(i_dmin).

EFFECT: providing maximum efficiency value of engine and implementing maximum electromagnetic torques in systems of vector control of asynchronous motors considering current and voltage limitation of power converter feeding the motor.

3 cl, 2 dwg