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ELECTRIC MOTOR CONTROLS ! ^+ d- m2 M$ q" N, |
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Once the proper motor is selected, understanding the many various control devices available and
6 n/ y5 q | p! J2 Y3 y$ a3 V' A+ ktheir uses and limitations becomes an important part related to reliable operation and protection of
7 l4 [" x% f: E1 T6 Q) p2 lthe motor and the personnel using the motor. 1 e: M+ W4 w8 N, V J V1 F
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Motor Control Topics * k+ L% D r( e; V% s, G
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There are four major motor control topics or categories to consider. Each of these has several
( E5 x6 |1 _: msubcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor 5 J; X6 w6 ^2 f7 \( G$ j
control equipment can accomplish multiple functions from each of the topics or categories. 8 T( G1 T+ _! d+ K
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The four categories include:
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1) Starting the Motor + w5 M$ u5 N7 r) M& ^7 F# S$ i( b: U
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Disconnecting Means % b2 W2 v0 z9 x* D, w! s7 r8 N
Across the Line Starting 6 T3 P; _% A5 R. E @4 q
Reduced Voltage Starting
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2) Motor Protection . S9 P6 @3 Z7 M
5 [: k: `# p' b6 C- b+ }Overcurrent Protection
/ T1 D; h$ c0 ?/ `7 aOverload Protection
1 Y8 D% H: F5 h# e9 D* iOther Protection (voltage, phase, etc)
5 d6 C# T3 h: j7 [1 N- J7 jEnvironment ( F3 f4 p7 |8 d' l( k
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0 G6 }1 [: l" b0 k3) Stopping the Motor - P7 `$ G1 n1 `* Y* V: T( f- ?1 f4 B4 {# j
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Coasting 9 R0 T* |1 C6 J6 }6 G A; O, M" O
Electrical Braking
_* r U ^8 b t H8 rMechanical Braking
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4) Motor Operational Control
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, a* {" E- t6 X$ R& LSpeed Control
% L4 S2 J8 k' O; pReversing - X6 _ R% O3 o+ p- ^: o, S# L
Jogging
* p$ v7 v% f% c7 uSequence Control |
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发表于 2009-6-19 21:51
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