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Transcript
SWITCHED RELUCTANCE MOTOR INTRODUCTION Its is a type of stepper motor that works on reluctance torque. What is reluctance torque? Control synchronizing the energy Positive torque (motoring) Negative torque (braking) Performance of SRM Electrical position sensor Construction Rotor Salient poles ferromagnetic material No windings Not physically connected to stator Stator Salient poles Wound field winding 2 wires per phase Connected to controller Construction It is doubly salient and singley excited motor. Minimum reluctance positioning rotor. No. of pole in stator > no. of poles in rotor. working The drive rotates the magnetic field. sequentially switching the current . rotating stator field induces a voltage . speed of the switched reluctance rotor . speed and the torque are controllable . Rotor is chasing current. Power circuitry Torque vs. Speed • Operation is programmable. • Limitations • Base speed Applications Fault tolerance: The motor circuit design has no short circuit paths across a dc power supply in case of failure. The motor can run and even start with a fail condition provided sufficient torque remains. Efficiency: SRM efficiency can be maintained through a wide torque and speed range. BLDC motors have higher efficiency at low speed , SR motors have high efficiency at high speed. Applications Coal shearing Friction welding Textile spinning Advantages Winding only on stator Rotor is smallest and has lowest moment of inertia hence large acceleration rate. Superior from maintenance point. Negligible rotor losses. Negligible mutual coupling. Disadvantages Ripple torque is high but can be reduce by overlapping the phase current. F&W losses are high. Power converter to run. Position information is required.