Part 4 Machines - Electronic& Computer Engineering...

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Unformatted text preview: Electronic & Computer Engineering, School of Engineering and Design www.brunel.ac.uk/about/acad/sed App Software Motion Controller Amp/Drive Motor Position Voltage Current Position Feedback Elements of a Motion System Mechanical Feedback Device Electronic & Computer Engineering, School of Engineering and Design www.brunel.ac.uk/about/acad/sed D.C. Generator Mechanical energy (or power) → Electrical energy (or power) a) The basic essential parts of an electrical generator are: A magnetic field A conductor or conductors which can move so as to cut the flux dt d N e Φ = Electronic & Computer Engineering, School of Engineering and Design www.brunel.ac.uk/about/acad/sed Due to the rectifying action of the split-rings (also called commutator) the current in the load becomes unidirectional. Electronic & Computer Engineering, School of Engineering and Design www.brunel.ac.uk/about/acad/sed Uniform DC Voltage Electronic & Computer Engineering, School of Engineering and Design www.brunel.ac.uk/about/acad/sed 1) Magnetic frame Pole-cores and pole- shoes Pole coils or field coils Armature core Armature windings or conductor Commutator Brushes and bearings A typical generator Electronic & Computer Engineering, School of Engineering and Design www.brunel.ac.uk/about/acad/sed DC Generators When a conductor moves in a magnetic field then an e.m.f. is induced across it. F B I e = -d Φ / dt e → e.m.f. Φ → Magnetic flux (B*A) V Electronic & Computer Engineering, School of Engineering and Design www.brunel.ac.uk/about/acad/sed DC Motors A force is exerted on a conductor in a magnetic field when a current passes through it. F B I F = B I L L → Length of conductor I → Current in conductor B → Flux Density F → Force Electronic & Computer Engineering, School of Engineering and Design www.brunel.ac.uk/about/acad/sed Permanent Magnet D.C. Motor Permanent magnet gives a constant value of flux density. N → no. of conductors The torque resulted from the forces: T = NBbL I T = K t I b → coil breadth F B I L b K t → Torque constant Electronic & Computer Engineering, School of Engineering and Design www.brunel.ac.uk/about/acad/sed Back e.m.f Since an armature coil is rotating in a magnetic field, electromagnetic induction will occur and a back e.m.f. will be induced. v b = K v ω K v → back e.m.f. constant ω → angular velocity of the rotation Armature coil Back e.m.f....
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This note was uploaded on 04/20/2011 for the course ENG 1333 taught by Professor Brr during the Spring '10 term at American College of Computer & Information Sciences.

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Part 4 Machines - Electronic& Computer Engineering...

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