Experimental investigation of shaft transducerless speed and position control of ac induction and interior permanent magnet motors

摘要

In order to drive AC motors with high efficiency and highmotion performance, and to provide accurate speed/position control,motor shaft speed and/or position feedback is required. For thispurpose, usually transducers (encoder, tachogenerator, resolver, etc.)are installed on the shaft. However, transducers are not preferred inmost of the applications since they increase the cost and decrease thereliability of the drive due to their failure prone structure andconnections. In such applications, the speed and/or positioninformation of the motor is obtained by estimation methods withoutusing shaft transducers. In this work, motor types and speed/positionestimation methods will be surveyed, appropriate estimation methodswill be determined based on the motor type (induction or interiorpermanent magnet synchronous) and the application requirement (speedand/or position control requirement). High frequency signalinjection, speed adaptive flux observer, open loop integration basedflux observer methods, and combination of them in a hybrid algorithmwill be investigated. By implementing these methods, the experimentalperformance of the shaft transducerless speed and/or positioncontrolled vector control based induction and interior permanentmagnet synchronous motors will be presented. The study helps themotion control engineers select the suitable motor and implement theappropriate speed/position estimation algorithm for a givenapplication.