Several problems about ac servo motor

Several problems about ac servo motor:Q:(A) of the ac synchronous servo,ac asynchronous servo rated speed is related to whether the number?N1 = 60 f / 2 p? Output constant torque under the rated

speed,constant power above rated speed,so the definition of the rated speed is determined by

induction motor sales the mechanical motor itself or drive to decide?,synchronous speed n1 = 60 f / 2 p,asynchronous machine and slip s,n = (1 - s) n1,synchronous machine n = n1,2 p is logarithmic. Definition of weak magnetic speed control is to judge by the driver.Rated speed can be determined by several aspects:synchronous servo's potential height allows the drive current of motor iron core materials,alternating frequency,maximum power under the rated torque motor, The highest temperature rise,etc.,the main or against potential; Asynchronous motor is mainly restricted by material allows the highest frequency and polar logarithmic. The definition of the rated speed of mechanical and,by the motor itself Electrical characteristics.Q (B) :ac,dc servo distinguish whether or not depends on the drive and motor current or voltage between form?But also changes in the current direction of the brushless dc servo? Whether can be understood as contact? Ac servo is based on the principle of the brushless dc servo evolution? pumps Answer:ac servo usually refers to with sine wave driving mode of servo,brushless drive is equal to the number of the commutator is 6 (7) of a brushless dc motor control precision,poor general characteristics at low speed.Has called him the commercial ac servo,only because electricalmotor1.blogspot.com he get rid of the brush,but I'm afraid that features than good ac servo,dc servo has the gap,10000 times the speed of brushless motors are unique Difficult to achieve.