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ELCT 553 Electromechanical Energy Conversion. Magnetic Circuits Power Transformers Actuators DC and AC Machines (motors and generators). Electromechanical Energy Conversion. Conversion of electrical energy to mechanical energy (a motor, for example)
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ELCT 553 Electromechanical Energy Conversion Magnetic Circuits Power Transformers Actuators DC and AC Machines (motors and generators) ELCT 553
Electromechanical Energy Conversion • Conversion of electrical energy to mechanical energy (a motor, for example) • Conversion of mechanical energy to electrical energy (a generator, for example) • Also transformers convert electrical energy from one voltage to another or couple two circuits together ELCT 553
Coupling Field • All electromechanical energy conversion devices use a coupling field to perform the conversion • Electric fields are used but not often • Magnetic fields are used often • Energy density favors magnetic devices • Micro and nano sized devices may use E field ELCT 553
Transformer • Electrical energy to electrical energy, but also uses a coupling field (magnetic field almost always) • Consider an iron core having two coils ELCT 553
Magnetic circuit: Iron core with one or more coils I H N turns V ELCT 553
fc F = NI Rc Magnetic circuit ELCT 553
I fc N turns V ELCT 553
Magnetic circuit: Iron core with one or more coils I1 I2 fc V1 V2 N1 turns N2 turns ELCT 553
fc Rc F2 F1 Magnetic circuit ELCT 553
Magnetic circuit: Iron core with one or more coils I1 fc V1 Air gap length = g Average iron core length = lc N turns ELCT 553
fc Rc F Rg Magnetic circuit ELCT 553