ارائه روش بدون سنسور جهت تعيين موقعيت روتور بر پايه محاسبه اندوكتانس افزايشي در موتور رلوكتانس سوييچ شونده

چكيده انگليسي :

A Sensorless Method in Switched Reluctance Motors Based on Incremental Inductance Computation to Rotor Position Determination Soroush Abrari s abrari@ec iut ac ir Date of Submission 2009 05 30 Department of Electrical and Computer Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language FarsiSupervisor Sayed Morteza Saghaiannezhad saghaian@cc iut ac irAbstract Depending on the quality of performance required for a particular application such as for a lowperformance the phase current and speed signals may be dispensed within the control system The feedbacksignals are usually measured with transducers which increase the cost of the electronic controller and itspackaging size In the case of a rotor position speed transducer the size of the motor housing and the costare increased significantly Emerging high volume applications in heating ventilation and air conditioning HVAC fans pumps home appliances automobile accessory drives and many others are cost sensitive The performance requirements for such applications are not high as is required for machine tool servodrives The requirement of low cost with high performance for motor drives has placed the agenda of low cost sensor based or sensorless technology at the forefront of presentday research and development ofmotor drives SRM drives are no exception to this trend as seen from the high degree of interest shown byindustrial and academic researchers worldwide on this topic Rotor position can be directly measured by arotor position sensor However mounting the rotor position sensor increases the size and cost of the overallsystem The rotor position sensor is also a source of unreliability in applications of a harsh environment likein aircrafts where a very high speed is required It is also a source of unreliability at high temperatures andwhere electromagnetic interference presents This is added to possibilities of mechanical failure So attention has been paid to indirect rotor position estimation to remove the rotor position sensor Severalindirect position sensing methods have been patented and published for sensorless control of SRM drives For all previous techniques it can not be claimed that one particular method is suitable for all types ofapplications The position sensing techniques depend on a number of factors such as the type ofapplication the type of converter used and the control strategy In this thesis we represent a sensorlessmethod in switched reluctance motors based on incremental inductance computation to rotor positiondetermination The relationship between inductance and rotor position for each excitation current is uniqueover half a rotor pole pitch regardless of the rotor speed This particular feature of an SRM is then used tofind the rotor position from the estimated or measured inductance of a machine phase winding from thestored information of inductance vs rotor position for each current in the control circuit The burden ofstoring the inductance vs rotor position information for all currents could be simplified in many ways andis discussed elsewhere Different practical sensorless method are discussed in details In the end there is a summary ofthesis and suggestions for further studies Keywords Position Sensor Switched Reluctance Motor Incremental Inductance Rotor Position

ابراري، سروش

ارائه روش بدون سنسور جهت تعيين موقعيت روتور بر پايه محاسبه اندوكتانس افزايشي در موتور رلوكتانس سوييچ شونده

موتور SRM