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ELECTRIC MOTOR CONTROLS + i& h: h0 V' t9 I, ~2 }! |
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Once the proper motor is selected, understanding the many various control devices available and - H! v$ h* L3 d+ Q5 c o2 y& U- m
their uses and limitations becomes an important part related to reliable operation and protection of , V" U& H# { y' u% K
the motor and the personnel using the motor.
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Motor Control Topics & H8 n+ K4 R4 Z* I4 v
7 O0 \3 g' N X+ V$ s! s. |There are four major motor control topics or categories to consider. Each of these has several ' A* i% K1 ~" L% z* Z6 w
subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor a. h4 U% G5 ?; Z5 H' u# R: p! t
control equipment can accomplish multiple functions from each of the topics or categories. # e$ N" r$ H6 c& b5 h; }5 N# l# r
( u2 `/ E8 Z+ }! l" Q4 |' D+ SThe four categories include: - B. M$ G- T3 ]( J) d: F! \9 Z
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1) Starting the Motor + m. T* N$ @# t. L/ F; S& j% M
# j8 g. i( f' l6 v( D gDisconnecting Means 5 o# I* U$ E z! R
Across the Line Starting
$ [" {& {% J& s7 N( i- p. mReduced Voltage Starting
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/ a1 g+ x1 f% z, B8 u* ]$ v! T2) Motor Protection
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# U! ]- E# ?5 z s% T4 T9 S( a) kOvercurrent Protection
: r3 L s( s, e ]5 ~- rOverload Protection 3 j' j1 j) d" \. v7 N5 \
Other Protection (voltage, phase, etc) 8 X l+ G, Y# Z; h. |
Environment - i$ X8 ?9 {4 Z1 V. }/ n
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% @: k4 s: r0 U" G, x5 J3) Stopping the Motor & z+ Y& N1 Y8 d" h+ Z/ |
, n3 g$ U2 I- v7 QCoasting
+ F! l$ H$ W/ u8 h, u6 ZElectrical Braking
" V7 C" G4 S# H- Y$ e2 r: JMechanical Braking 8 ]* G5 V6 h n( h
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4) Motor Operational Control # T( H8 D! k7 E9 t5 v) l8 g' m
% ~! u! s) H* l$ USpeed Control
0 U8 x# I; M& Z9 sReversing
/ D1 Y7 n# d9 X2 J2 v* wJogging 6 g* _' I3 j+ ]& n' ?1 d v
Sequence Control |
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发表于 2009-6-19 21:51
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