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Unformatted text preview: Page 1 Fundamentals of Power Systems Lecture 17 1 Electric Motors z Three basic types of motors Synchronous, SM Induction (asynchronous), IM DC motors In the past: preferred for variable speed applications 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 Page 2 Fundamentals of Power Systems Lecture 17 3 Synchronous Motor (SM) sin R S R N e t R Net kB B kB B kB B W W W G u u G G G G G G G Motor Leading PF Generator Lagging PF Fundamentals of Power Systems Lecture 17 4 SM Loading Characteristic, I F = const 3 s i n ( ) A in out S V E P P X I G Neglecting losses, V I = const....
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- Spring '08