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ELECTRIC MOTOR CONTROLS * g0 m! a# A* Q/ q
9 ^4 a# H. J. _1 f' R: K2 f( b: Y x# WOnce the proper motor is selected, understanding the many various control devices available and 1 q# x2 x0 n r: b
their uses and limitations becomes an important part related to reliable operation and protection of
+ K- n0 ?$ z& _- r7 s: D. a3 ]6 dthe motor and the personnel using the motor.
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) J0 }/ l' ~$ G- `2 VMotor Control Topics
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& x4 L4 t5 i6 EThere are four major motor control topics or categories to consider. Each of these has several
- n6 _2 m M" c* qsubcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor 5 I; M4 O, a: _% ]4 @9 m5 y2 c
control equipment can accomplish multiple functions from each of the topics or categories. 8 V' P( X5 F4 M+ j {: f
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The four categories include: " r; n" W8 M0 G6 h! S) e2 t5 T0 I
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1) Starting the Motor
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1 [/ x/ P N. J9 F4 s, j# zDisconnecting Means 3 T) X5 K& _* e/ J( F6 c
Across the Line Starting 5 U$ b) b& @5 A* g+ k5 Y, l
Reduced Voltage Starting 4 |4 h$ R% z9 y9 O! O( b+ a
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: Z7 Z9 l9 N! u$ f2 D4 A2) Motor Protection 6 O; l* ]0 k; ~( Z* C
: b9 k$ v, e& ]7 k$ @9 q3 i3 @! Q8 BOvercurrent Protection
* _5 r$ J0 c! N! {. M) Z" t+ A6 IOverload Protection
# u7 i8 g* P% ?! VOther Protection (voltage, phase, etc)
7 T! d: ]8 W" F" n# aEnvironment
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0 ~% b. s2 Z* U+ I3) Stopping the Motor 8 j/ ~: @, Q5 ?8 t5 K) J% B
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Coasting $ x4 k) L! Z- O; ^ U! G# V
Electrical Braking ; ^9 C2 Q2 h- Z
Mechanical Braking r( Q/ g7 D9 Z9 }: d- Q" t) M0 M
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$ L! N) l: ^0 P9 F4) Motor Operational Control 5 B8 e8 A( `6 f% \. U6 U( z8 p9 _3 } H
( D# V/ Z6 ~: y* k+ fSpeed Control
: [1 h. A- t" g! CReversing
" l; `/ Y: i6 i8 v. k% R# {. {3 ^Jogging 9 E; l/ {. y5 Z3 y4 a2 M
Sequence Control |
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发表于 2009-6-19 21:51
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