Position sensorless control of a transverse-laminated reluctance synchronous machine

[摘要] ENGLISH ABSTRACT: The focus of this thesis is position sensorless control of a transverse-laminated reluctancesynchronous machine. Rotor position information is required for high-performance closedloopcontrol of the reluctance synchronous machine and is conventionally supplied byunreliable hardware position resolvers. In addition a FPGA-based rapid prototypingsystem is completed as part of the research term for control of the machine drive system.For the first time the unified active-ux (AF) method is investigated and implementedfor position sensorless control of the transverse-laminated reluctance synchronous machinein this study. The method is based on the torque equation of the machine and is basicallythe same for any AC machine. The estimation scheme is implemented for closed-loopposition sensorless control from low- to rated speed in the entire rated load range withsimulation and measured results confirming its capabilities. A number of characteristicsof the machine (including generator operation) have implications for implementation ofthe active-ux (AF) method and are therefore investigated.Another position estimation method investigated is the arbitrary injection (AI) schemewhich is derived to be completely machine parameter independent. The method simplyrequires a current progression at each calculation step allowing use of a smaller injectionvoltage. This method is implemented again on the reluctance synchronous machineand is shown to be capable of position sensorless current and speed control of the drivefrom standstill to rated speed with simulation and measured results. However, when themachine is operating above low speeds it is shown that this technique is only capable ofposition sensorless control at low loads.To deliver position sensorless control in the entire rated speed and load range a newhybrid controller scheme is designed and implemented. The hybrid scheme is speed andload dependent with hysteresis regions for stability at specific working points. The active-ux (AF) method is implemented in the low to rated speed range at medium to ratedloads while the arbitrary injection (AI) method is implemented elsewhere. Measuredresults show that the scheme is capable of position sensorless control in the entire ratedspeed and load range with some limitations on dynamics.Because of the limitations on dynamics of the hybrid scheme an assisted fundamentalmodel position estimation scheme was investigated. Simulation results show that thiscontroller requires further investigation.

[发布机构] Stellenbosch University