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ELECTRIC MOTOR CONTROLS : q1 n5 [: |* @7 P6 s2 i0 s
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Once the proper motor is selected, understanding the many various control devices available and
& b) T; ^4 O: q5 C( v! ttheir uses and limitations becomes an important part related to reliable operation and protection of / X/ B( }, B5 S6 h' X% U
the motor and the personnel using the motor. # k4 ]. A3 e* ^9 V6 `
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Motor Control Topics
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There are four major motor control topics or categories to consider. Each of these has several
% n3 J8 J1 o6 ~6 s1 r3 Nsubcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor
0 j9 L; B+ {0 ^/ s: Z& V. y0 h6 lcontrol equipment can accomplish multiple functions from each of the topics or categories. . K7 a# V& c. r7 c- u
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The four categories include:
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1) Starting the Motor 3 |) z9 A2 Y! I0 s' \, X- A
) F. S! Y( ~7 s# u4 K7 SDisconnecting Means
8 t- D/ y- K5 Q Q+ ]# YAcross the Line Starting
, j% V) k w) | L, r" f, YReduced Voltage Starting % v6 M, D, N) W" |- u
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1 N0 J+ t$ i5 s% Q2) Motor Protection
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Overcurrent Protection
) j8 j% G8 ~# ^Overload Protection
3 [' U* y/ N4 @Other Protection (voltage, phase, etc) . q: s% O$ F5 \+ I' e
Environment ) j- j) Z& m0 R& B) k' u, k/ i* A. D
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0 Z w( a- q2 @3) Stopping the Motor
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Coasting 3 k0 G, }& r# ]) C& G. C) |$ i
Electrical Braking 0 g; F! \9 R: y$ z/ `
Mechanical Braking ! `' N) j$ ?8 r0 a- n4 l7 d6 V
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4) Motor Operational Control
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_2 q0 {, n% i3 Y: C0 n8 GSpeed Control
$ m8 h, u/ _2 TReversing 2 J w: b9 X9 T3 ~5 Q# r' {' N# M$ `
Jogging
2 P; X( W \$ _) W" p% g7 cSequence Control |
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发表于 2009-6-19 21:51
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