The Induction Machine Handbook

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The level of prosperity of a community is related to its capability to produce
8 ]$ G$ C& w4 x7 J1 ^7 X: qgoods and services. But producing goods and services is strongly related to the
use of energy in an intelligent way.
% w: L( ~3 n- I+ O0 qMotion and temperature (heat) control are paramount in energy usage.
8 k5 I& V1 B) [/ QEnergy comes into use in a few forms such as thermal, mechanical and
- E' K8 Q( ]9 |5 P4 Lelectrical.
Electrical energy, measured in kWh, represents more than 30% of all used
; f( h+ @5 Q" a2 n0 e1 Oenergy and it is on the rise. Part of electrical energy is used directly to produce
heat or light (in electrolysis, metallurgical arch furnaces, industrial space
heating, lighting, etc.).
4 P, p  E2 K: XThe larger part of electrical energy is converted into mechanical energy in
, ~" P6 R5 K: Y! M4 }2 e; aelectric motors. Among electric motors, induction motors are most used both for
home appliances and in various industries [1-11].
This is so because they have been traditionally fed directly from the threephase
a.c. electric power grid through electromagnetic power switches with
$ `5 ^* O9 P0 _$ }+ |6 |* }& W! X) Sadequate protection. It is so convenient.
Small power induction motors, in most home appliances, are fed from the
! N9 L3 K. V( A0 x2 ^local single phase a.c. power grids. Induction motors are rugged and have
; L! {" B& p0 L+ \5 |: omoderate costs, explaining their popularity.
" w; L- D. C' `, s6 M/ WIn developed countries today there are more than 3 kW of electric motors
: g) n: B5 `* d7 _4 U1 Qper person, today and most of it is from induction motors.
! {  K( z( D- H+ L8 D! f; NWhile most induction motors are still fed from three-phase or single-phase
4 k, w$ b# R  ^* L% u) g. ~; opower grids, some are supplied through frequency changers (or power
5 r* C6 M! \9 O  delectronics converters) to provide variable speed.
* k; y# `, T+ f9 k$ v. ]In developed countries, 10% of all induction motor power is converted in
! A  x& A6 r9 c0 ~variable speed drives applications. The annual growth rate of variable speed
9 B1 K6 W6 `2 N. d$ y1 ndrives has been 9% in the last decade while the electric motor markets showed
an average annual growth rate of 4% in the same time.
Variable speed drives with induction motors are used in transportation,
pumps, compressors, ventilators, machine tools, robotics, hybrid or electric
  z5 U# I* u+ L* o# nvehicles, washing machines, etc.
6 u/ [& U/ e$ p# I5 `( k6 j
斑主,给我加点分阿,叩谢!

imzgpzztcepsc

好东西

afandi

好东西  已下载  多谢楼主提供

lipo

好书！等分数够了再来下

xw550823189

应该是好东西！

dahu

谢谢斑竹啊