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ELECTRIC MOTOR CONTROLS % R* O+ \- z: z! y1 H1 q
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Once the proper motor is selected, understanding the many various control devices available and ( e; }+ F4 n8 D% z/ l7 X7 m* L
their uses and limitations becomes an important part related to reliable operation and protection of
4 y4 Y# H" C: j( j+ F% lthe motor and the personnel using the motor. " N! U2 P& A5 O, K+ {, ~, x
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Motor Control Topics ' r8 b- c* H# _; e& @
$ L/ O) V) t( V! D# L0 i" `* IThere are four major motor control topics or categories to consider. Each of these has several
, V: l1 L1 e7 T& i& Psubcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor
0 u3 I& Y8 _* i$ q) [6 |8 E1 S, icontrol equipment can accomplish multiple functions from each of the topics or categories. ) O9 z- n7 x: ?5 ?/ X
* z$ M% W' D P& A% D" N: {The four categories include:
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1) Starting the Motor $ F' M# n& M' C' L5 Q) I9 }3 g9 u
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Disconnecting Means , A P$ l4 W3 O, I# y* I4 w6 M
Across the Line Starting
6 f' P% b7 A( V, }; }1 jReduced Voltage Starting
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2) Motor Protection
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Overcurrent Protection # z( x' S/ g" r' M
Overload Protection
4 o2 B/ W2 W" a" ]+ m% EOther Protection (voltage, phase, etc)
! c/ r) ]6 J6 _Environment , h1 j2 s' J. f: g" Z
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7 D9 n8 g) g2 n- F3) Stopping the Motor & T; d7 @& N" I) O5 j- j8 E
9 N$ ~9 {7 ~5 g J+ a( }3 e- _Coasting
; ]' w3 t/ w& ]: r. FElectrical Braking 7 f$ Z# G2 f: q3 G
Mechanical Braking ) \& E2 L7 M8 \- |, h- o( ?
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, N* X" M8 u0 ~1 @4) Motor Operational Control
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Speed Control
" L1 u( x) t- p4 D* W) u( k2 H, hReversing
4 V7 ^/ U0 \5 @. d& OJogging
6 F9 H& e0 {. m* H2 K8 W3 JSequence Control |
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发表于 2009-6-19 21:51
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