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ELECTRIC MOTOR CONTROLS
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Once the proper motor is selected, understanding the many various control devices available and
6 L- `7 }, {4 o. Ttheir uses and limitations becomes an important part related to reliable operation and protection of
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Motor Control Topics
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9 p, R# C; p) P4 kThere are four major motor control topics or categories to consider. Each of these has several
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control equipment can accomplish multiple functions from each of the topics or categories. 4 ~/ J* H. D$ }6 w/ `2 [
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The four categories include:
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1) Starting the Motor
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9 u+ E3 ~* ^: o$ QDisconnecting Means
& V/ b* R' z2 [- X* g1 ~Across the Line Starting : l/ P: I7 {7 U" S Y7 Z- K4 W# \
Reduced Voltage Starting
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- u+ O& i; v( G- A6 W6 A2) Motor Protection 5 L' f' x3 I7 E7 o
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Overcurrent Protection
: M% {, x, d* g5 qOverload Protection 7 n* e2 `: y- }, z
Other Protection (voltage, phase, etc) ) F; `7 V+ ]- X$ C4 V/ L1 p$ `
Environment ; _3 o1 W6 j* r# {5 \. Z' E7 {
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3) Stopping the Motor
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Coasting
: \# j, H; h3 h& S9 z* y- [0 k4 mElectrical Braking
% v) a: j$ K: z6 RMechanical Braking
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* G4 A" H5 V& w. y; Z/ j4) Motor Operational Control s M9 A- v% Y0 z5 p3 A" G* E, Z6 T
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Speed Control * h+ q3 g2 j7 U' U- ^* g
Reversing
% _" d4 u& M& x; S, e2 EJogging
% K. L* O1 E' ]6 mSequence Control |
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发表于 2009-6-19 21:51
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