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ELECTRIC MOTOR CONTROLS 7 H$ z( N7 `. Z, ?9 C8 n6 z( D
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Once the proper motor is selected, understanding the many various control devices available and
( N2 ~0 v3 a' _9 ~( itheir uses and limitations becomes an important part related to reliable operation and protection of & |' s" k! g; k0 B( T |) f3 x; }
the motor and the personnel using the motor. # |: F& H7 x0 H$ L/ E% k
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Motor Control Topics $ j, ^# [+ v; f3 y
- x" B- j1 J% c/ iThere are four major motor control topics or categories to consider. Each of these has several 2 T' G3 p" ^: V2 i
subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor 1 e, m2 L; G+ ^2 p# |1 g, Y
control equipment can accomplish multiple functions from each of the topics or categories.
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* Q3 Y1 i/ Y) b/ S" ~The four categories include: . m" ] L" N$ o v
3 k5 W4 M' O$ k1 C2 ^1) Starting the Motor ! _( }" O v& M" J+ Q! l
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Disconnecting Means
$ y5 e/ Y" z3 p- @% S+ O* sAcross the Line Starting 7 |$ I5 H! ^" F2 K
Reduced Voltage Starting
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, u$ F2 v: k+ R1 h; d2 D8 Z; l; f2) Motor Protection - i( m1 |3 g* Y" `) e& o: s
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Overcurrent Protection # ^) o) a; D5 [" X4 o1 F1 c8 i* V
Overload Protection
9 w0 O/ ~8 e( F: U; bOther Protection (voltage, phase, etc)
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3) Stopping the Motor . N w5 w2 o6 Z; ~
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Coasting
7 W# t; i; ]6 o4 t6 o( ]( N" hElectrical Braking " g( S) Z4 y1 ]$ O# v. ^
Mechanical Braking % k. K4 j6 Y1 k' c+ d5 [
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7 v( ^; ~$ u7 V- p9 x4) Motor Operational Control
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& z N5 i5 T) J$ s" Q$ \Speed Control
3 T! `/ R! m$ S& f& hReversing & E5 H5 k8 K H4 ~
Jogging / I/ _3 ?; t! N2 f& {
Sequence Control |
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发表于 2009-6-19 21:51
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