Page 8 - Electric Drives and Electromechanical Systems
P. 8

List of principal symbols  xiii



                 z         Damping
                 q         Rotary position
                 q e       Static-position error
                 m         Coefficient of friction
                 r         PWM amplifier load factor
                 f         Flux linkage
                 u         Rotational speed
                           Synchronous speed
                 u e
                           Input speed
                 u i
                           Initial speed prior to application of regeneration
                 u int
                           Mechanical speed
                 u m
                           Natural frequency
                 u n
                           Output speed
                 u o
                           Rotor electrical speed
                 u r
                           Slip frequency
                 u s
                           No-load speed
                 u 0
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