List <strong>of</strong> symbol Subscripts A , B , C - denote arbitrary phase quantities in a system <strong>of</strong> natural coordinate ABC. , , d , q - arbitrary direct and quadrature components in a system <strong>of</strong> rotor coordinate dq. , α , β - arbitrary alpha and beta components in a system <strong>of</strong> stator coordinate α, β . x , y - denote arbitrary components in a system <strong>of</strong> general coordinate x, y . .. r - denotes value <strong>of</strong> rotor .. s - denotes value <strong>of</strong> stator .. _max - maximum value .. _min – minimum value .. _ ref - reference value .. _ est - estimated value .. _ amp -amplitude value .. _ rms - root mean square value .. _ LL - line to line value * - reference value ^ - estimated value Abbreviations RSM – reluctance synchronous motor BLDCM – blushless DC motor PMSM – permanent magnet synchronous motor IPMSM - interior permanent magnet synchronous motor SPMSM - surface permanent magnet synchronous motor EMF – electro-magnetic force VSI - voltage source inverter <strong>SVM</strong> – space vector modulator PWM – pulse width modulation PWM-VSI – voltage source inverter <strong>with</strong> PWM <strong>DTC</strong> - direct torque control <strong>DTC</strong>-<strong>SVM</strong> - direct torque control <strong>with</strong> space vector modulator RFOC - rotor field oriented control SFOC - stator field oriented control CTAC - constant torque angle control MTPAC - maximum torque per ampere control UPFC - unity power factor control CSFC - constant stator flux control 172
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