07-02-2013, 04:30 PM
Design of PID Controller by Pole PlacementTechnique for Switched Reluctance Motor
Design of PID Controller.pptx (Size: 439.05 KB / Downloads: 20)
Introduction
In the past, direct current (DC) machines were used extensively for variable speed operation, since their torque could be controlled easily by the armature currents. However, DC machines have certain disadvantages due to the presence of commutator and brushes. These machines require periodic maintenance, cannot be used in explosive or corrosive environments and have limited commutator capabilities under high speed, and high voltage operating conditions
In recent years, AC machines have started to replace DC machines due to the
enhancements in their control and power electronics. Over the past decade, there have been extensive development efforts of various kinds of brushless AC motor drives. These are induction motor (IM), permanent magnet brushless direct current (PMBLDC) motor, permanent magnet synchronous motor (PMSM) and switched reluctance motor (SRM) based drives.
SRM Configuration
The SRM is a doubly salient, singly excited machine with unequal numbers of stator and rotor poles. This is to ensure that the rotor poles are never in a position where the torque, due to the current in any phase, is zero (i.e. all rotor poles are aligned with stator poles). The common stator/rotor pole configurations are 6/4 and 8/6. The stator poles have concentrated windings and the coils on diametrically opposite poles are
connected in series to form one phase.
Conclusion
The step responses for speed controller and current controller of switched reluctance motor are verified. Also pole placement is applied to the switched reluctance motor and verified the response of the motor and also calculated the settling time, rise time,
steady state error and gain.