英语翻译Only few papers were published in the field of induction

英语翻译
Only few papers were published in the field of induction
motors with PLCs.A power factor controller for a three-phase
induction motor utilizes PLC to improve the power factor and
to keep its voltage to frequency ratio constant under the whole
control conditions .The vector control integrated circuit
uses a complex programmable logic device (CPLD) and integer
arithmetic for the voltage or current regulation of three-phase
pulse-width modulation (PWM) inverters