Research on the positioning control of asynchronous motor - scheme design

 At the beginning of the three-phase ac asynchronous motor brake,the commonly used inverter control,when go downhill to a lower end (e.g.,50 RPM),switch to this system.Due to the ac motor is strong coupling,multi-variable,nonlinear complex controlled object,more difficult to establish accurate mathematical model,and fuzzy control motor magnet does not need to establish a precise mathematical model of controlled object,has strong robustness.In practice,a motor with load is uncertain,but there are a range of.By fuzzy control to determine the location in a certain range.Energy consumption braking of ac motor parts motor is a motor spindle speed is zero,the braking torque to zero as well,so,in the motor brake mode choice with the method of braking energy.

Braking energy: the energy generator generator set consumption of the asynchronous motor brake,the stator winding of the motor from three-phase power source and immediate access to the stator winding dc current.No dc power supply,can be used as shown in figure 1 a circuit;If a dc power supply,can be used as shown in figure b connection mode.Circuit shown in figure 1,the normally open contacts of contactor KM1,when closed to the three-phase ac power supply,motor stator motor running on electric state.For braking energy,can make the power coil,contactor XK acmotortrading.blogspot.com motor from three-phase ac power supply.Immediately make the contactor coil electricity KM2,normally open contacts closed KM2,within two phase winding of the stator flux into the dc power supply.