Ac motor speed control method

Three-phase asynchronous motor speed control method,can have change very logarithmic p (speed regulating pole change motor),change frequency f1 (VVVF) and s (change slip acmotor2.blogspot.com speed) three.Change the power supply frequency f,slip ratio of the motor very logarithmic p and s can be too much to change speed.From the perspective of the nature of speed regulation,different ways of governing is nothing but change synchronous ac motor synchronous speed or not turn two.Widely used in the production of machinery is not the change in speed control method of synchronous speed of wound rotor motor rotor series resistance speed governing,chopping speed regulation,cascade speed regulation and application of the electromagnetic slip clutch,hydraulic coupling,such as oil film clutch speed regulation.


Changes of the synchronous speed logarithmic multi-speed motor,stator can change of the stator voltage,frequency,frequency control of electric motors 12 volt motor speed has no commutator motor speed regulation and so on.From energy point of view,when there is high speed control method and low speed control method of two kinds: an induction refers to the ac electric motor motor effective speed control is constant,so there is no slip loss,such as multi-speed motor,frequency control of motor speed and slip loss can be recovered speed control methods (such as cascade speed regulation,etc.).Have slip loss speed regulation method belongs to the low speed,such as rotor series resistance speed control method,the energy loss in the rotor circuit; Electromagnetic clutch speed regulation method of energy loss in the clutch coil; Hydraulic coupler speed regulation and energy loss in the oil of single phase asynchronous hydraulic coupling.In general slip loss increases with expanding range of speed regulation,if the speed range is not big,energy loss is small.