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Content • Introduction • Elementary DC machine • Voltage and Torque Equations • Basic Type DC Machines • Dynamics characteristics of Magnet Permanent and Shunt DC Motor 2 Introduction • DC machines application not widely used • DC generator is replaced by rectifier • DC Motor is still used in lower power : –Shunt DC Motor –Permanent Magnet DC Motor • Brushless DC motor becomes popular and widely used in electric vehicle. 3 Elementary of DC Machine • Stator coil as field winding source of flux • Rotor coil as armature 4 Voltage Equation Voltage equation for field winding and rotor coil Flux linkage : Mutual inductance winding between field winding and armature as a function of Θr : Θr = 0, π, 2 π, ........ L= Constant 5 Open circuit voltage 6
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