Digital generator of the three-phase PWM waveform for variable speed control of induction motor

摘要

(57) [Summary] In the apparatus for generating a three-phase pulse width modulated waveforms that are used to control the (modified with) CONSTITUTION] three-phase variable speed constant torque induction motor, a microprocessor 12, the microprocessor read only memory 14 for storing a plurality of tables containing programming and desired information respectively corresponding to the driving frequency of, receiving from one of the plurality of tables in memory, it is pulse-width modulated three-phase to the induction motor multiple timers 18 for generating a timer output corresponding to the 90 ° portion of the waveform, a latch 34 for generating a plurality of inversion control signal, the timer output, the induction motor controller in the inverting state or non-inverted state It equipped with a pulse width modulated waveform conditional device 46 to pass. EFFECT increase the flexibility of control, efficient generation of the PWM waveform, changes to different applications in real time software, after being configured real time software, such that it does not require a factory calibration there is an advantage.