The Induction Machine Handbook

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The level of prosperity of a community is related to its capability to produce
& x7 p) K/ `2 u$ `6 H9 \+ Bgoods and services. But producing goods and services is strongly related to the
5 O! N9 A0 E1 p7 nuse of energy in an intelligent way.
7 w5 f$ ]1 h' P, P1 ?) x) D6 BMotion and temperature (heat) control are paramount in energy usage.
) C# x* t% f" A8 vEnergy comes into use in a few forms such as thermal, mechanical and
- z5 v. a7 M+ L) Q0 \# b- K  z/ oelectrical.
- ?4 p! v& W" l% K& J: ~Electrical energy, measured in kWh, represents more than 30% of all used
energy 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
/ u9 [, \; {+ o# p6 y+ E5 yheating, lighting, etc.).
The larger part of electrical energy is converted into mechanical energy in
& ?$ y5 L% {; ]+ B8 w) C& {electric motors. Among electric motors, induction motors are most used both for
home appliances and in various industries [1-11].
3 n. Y$ h/ u0 R0 U* T6 R7 cThis is so because they have been traditionally fed directly from the threephase
1 P; }1 a( ^8 W$ `1 u' d# ^  ?; ~a.c. electric power grid through electromagnetic power switches with
adequate protection. It is so convenient.
: x! x/ T9 L, h8 QSmall power induction motors, in most home appliances, are fed from the
local single phase a.c. power grids. Induction motors are rugged and have
) s0 o: R# [# Q6 A6 Z# omoderate costs, explaining their popularity.
In developed countries today there are more than 3 kW of electric motors
per person, today and most of it is from induction motors.
+ Z4 Q0 H) D- D% N; b- \. TWhile most induction motors are still fed from three-phase or single-phase
power grids, some are supplied through frequency changers (or power
1 T  {0 a6 P" kelectronics converters) to provide variable speed.
In developed countries, 10% of all induction motor power is converted in
' i' s* i) @9 F, E4 m$ T/ B7 avariable speed drives applications. The annual growth rate of variable speed
6 `7 D/ k6 |! ~+ d5 rdrives has been 9% in the last decade while the electric motor markets showed
an average annual growth rate of 4% in the same time.
# R6 E( `4 t) S, P5 WVariable speed drives with induction motors are used in transportation,
& ]2 P5 ~0 Y% @' Ipumps, compressors, ventilators, machine tools, robotics, hybrid or electric
vehicles, washing machines, etc.
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5 G5 v) t2 W% y- C9 [! Q" f5 V斑主,给我加点分阿,叩谢!

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好东西

afandi

好东西  已下载  多谢楼主提供

lipo

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dahu

谢谢斑竹啊