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ELECTRIC MOTOR CONTROLS 6 }5 W& B4 w! i3 f% G/ q/ E
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Once the proper motor is selected, understanding the many various control devices available and
' d* r; j( J* s1 x5 o, {their uses and limitations becomes an important part related to reliable operation and protection of
0 N8 A" M6 q. U8 V& A/ ^$ H* Sthe motor and the personnel using the motor.
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Motor Control Topics * p# R+ ^' h& v+ `2 \1 A+ P" M
+ O e$ r# P* g% nThere are four major motor control topics or categories to consider. Each of these has several
9 J! b6 z( B' ?, j; M; s2 Isubcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor
" l8 u8 B7 \# ~( i% Dcontrol equipment can accomplish multiple functions from each of the topics or categories.
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1 s- [- c' C" G8 B' P4 oThe four categories include:
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9 Q! C }( O }9 H* M1 O. J1) Starting the Motor / p# s; i& U3 X6 R1 H
0 Y- \- t% O0 z. bDisconnecting Means
( R2 }, ^/ F2 E) p z# uAcross the Line Starting
$ W6 ^' [4 Y4 ?3 \7 g, M( G+ \; ]2 ZReduced Voltage Starting
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2) Motor Protection ! V( `. }5 P }# J/ O
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Overcurrent Protection , b/ v7 L- @ W [: y! t2 B
Overload Protection & N ]- ?; \% {1 F1 ~1 B& ]. x
Other Protection (voltage, phase, etc) " {. X) M, e; o6 Y8 t- B7 ~
Environment
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3) Stopping the Motor
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}& Z, g: d" x1 n5 S& ?Coasting ! C3 w1 f; F T1 j/ d
Electrical Braking 8 N7 S) W, R1 b
Mechanical Braking / z8 @: U) Y9 W2 x4 X( O" T; o
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5 a c" X7 G; Q( p2 R. L4) Motor Operational Control
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# q H9 R! U4 {7 Q& ~6 BSpeed Control . f' n" T( `4 p7 h4 }& U( n
Reversing - B9 Y0 j7 C7 k* F+ u
Jogging . L" J% ?/ z4 I _$ I+ C9 }- F. Z/ u- w C
Sequence Control |
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发表于 2009-6-19 21:51
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