A VECTOR-CONTROL APPARATUS FOR A PARALLEL INDUCTION MOTOR

摘要

The present invention relates to a vector control apparatus for a parallel induction motor, and more particularly, the torque and flux command the command and torque and flux / current conversion unit that converts a DC current of the torque current and flux minutes; The torque and the magnetic flux command / current converter torque and flux values and the current minute and the first and second subtracter to obtain a difference between the actual torque and flux minute current value output from the sync output from the coordinate converter unit; And a PID controller for calculating the stator voltage on the first and proportional integral differential receives the torque and flux minute current difference signal output from the second subtractor; And still coordinate conversion unit for converting the DC voltage command value output from the PID controller of the stator to the AC voltage command value; And 2/3 phase conversion unit that converts the AC voltage command value output from the two-phase to three-phase stationary coordinate converter; And pulse width modulation inverter that drives the number of induction motors connected in parallel to the 2/3 phase pulse width modulation to convert an output voltage; And 3/2 phase conversion unit that converts a three-phase current output from the inverter to the second phase; A synchronous coordinate conversion unit that converts the current outputted from the 3/2 phase conversion unit to the actual torque and flux minute AC current on the basis of the rotor angular velocity; A first and a second differentiator for differentiating the magnetic flux command and the torque / current torque and flux minute current being drawn from the converter; Based on the DC voltage command value of the stator flux and the torque output from the command / current conversion derivative of the torque and magnetic flux and magnetic flux current and torque minute minute current through the first and second differential output from the differentiator portion and the PID controller and the synchronization angular velocity calculation unit for calculating the angular velocity in synchronization with the formula as defined; The motivation is that by integrating the angular velocity of the rotor synchronous output from the angular velocity calculation unit is configured as an integrator that calculate the rotor flux angle. ; Thus, the parallel induction motor vector control during a torque control operation If this cost may be required to mount a speed sensor in addition to the reduction motor, does not install a speed sensor and a speed sensor to remove defective or precision error effect, once the temperature change of the electric motor does not use a constant electrical resistance is independent of the induction motor can be controlled in parallel.