Lecture17

Lecture17 - Electric Motors Three basic types of motors...

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Page 1 Fundamentals of Power Systems Lecture 17 1 Electric Motors z Three basic types of motors ± Synchronous, SM ± Induction (asynchronous), IM ± DC motors ² In the past: preferred for variable speed applications ² Decreasing in popularity; replaced by combination of IM and power electronic variable speed drive (VSD) z Applications ± SM: largest power ratings, e.g. pumps for hydro power plant, electric ship propulsion, steel mills (with VSD) ± IM: “workhorse” of the power industry, from fractional kW to MW ratings, e.g. air conditioner (compressor, fan), elevator, crane, electric vehicle (with VSD) ± DC: low power, pure DC applications such as cars, also universal motor (for DC and AC), Fundamentals of Power Systems Lecture 17 2 Synchronous Motor (SM) I A Motor Generator I A Generator: source convention, positive power leaves the machine Motor: load convention, positive power enters the machine
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Page 2 Fundamentals of Power Systems Lecture 17 3 Synchronous Motor (SM) () sin RS RN e t e t kB B kB B kB B τ δ = G G G GG G G Motor Leading PF Generator Lagging PF Fundamentals of Power Systems Lecture 17 4 SM Loading Characteristic, I F = const 3s i n ( ) A in out S VE PP X φ == Neglecting losses, V φ = const.
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This note was uploaded on 11/10/2011 for the course EEL 3216 taught by Professor Brooks during the Fall '08 term at FSU.

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Lecture17 - Electric Motors Three basic types of motors...

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