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ELECTRIC MOTOR CONTROLS ; `& E; @2 p1 [" U+ H6 ^
9 I& G$ ^' A' T0 i# J* A# A% }# LOnce the proper motor is selected, understanding the many various control devices available and 1 y2 ~; p `2 l" p4 I
their uses and limitations becomes an important part related to reliable operation and protection of
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. b ~! `. x0 k: J! HMotor Control Topics % E: S5 P ]& Y9 A3 |
/ u. V" i) A' i! YThere are four major motor control topics or categories to consider. Each of these has several
' C9 ~" N+ k" L2 M0 Fsubcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor 9 ^; z2 ^9 t7 A6 f$ J
control equipment can accomplish multiple functions from each of the topics or categories. 2 A* v9 w: _9 ?$ J {: f
" T. f3 n& Q9 T* o* SThe four categories include: ' X; e7 T" N' ~
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1) Starting the Motor % R+ g- f3 S9 {, A' j+ p
1 R! [. c' z6 L4 c2 h- CDisconnecting Means
1 G; {$ ?* \2 i/ u9 H; uAcross the Line Starting
4 Q5 y. W" H5 W, b' t- k8 w5 YReduced Voltage Starting
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) {% g& T2 F; ]: v/ B2) Motor Protection # I9 C, y5 U' t1 w/ N9 u) _
' H( M' m1 Y( U w8 C6 iOvercurrent Protection 6 z, F: _0 \' J; h6 b2 [
Overload Protection ( z \0 E2 @* Q! b6 }
Other Protection (voltage, phase, etc)
! G' F) J3 w6 l+ aEnvironment
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3) Stopping the Motor 4 N4 I4 n; Y# ]1 W; _: M3 ]
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Coasting
) {) ~* o8 `# |. IElectrical Braking $ r( }& n3 r: k7 q4 ~# d
Mechanical Braking 6 A( ]! M/ _% S% T4 q. ]0 x
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( Z: b- n ^8 Y! {+ L# s i4) Motor Operational Control 9 H. o h4 X2 L: a' A
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Speed Control % c# S" r( C9 Q% A
Reversing
( |4 v8 u1 X. B: z* _Jogging
3 s2 u( i% B" K/ ]7 B5 wSequence Control |
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发表于 2009-6-19 21:51
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