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ELECTRIC MOTOR CONTROLS
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Once the proper motor is selected, understanding the many various control devices available and , e8 A) d! W. [. Z' A
their uses and limitations becomes an important part related to reliable operation and protection of
% x( n2 C( N5 {8 `" F3 \, |the motor and the personnel using the motor. $ U% v8 Q# K/ A" d% {/ t; r
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Motor Control Topics 5 t) p$ g6 ]/ W
6 [' X( ~- l& ]' d1 J" C- D* IThere are four major motor control topics or categories to consider. Each of these has several
: I9 x4 [" P- j1 \3 A c6 ]' Lsubcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor ' h5 v% D8 m. t$ s
control equipment can accomplish multiple functions from each of the topics or categories.
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The four categories include:
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' V4 ?- V6 f/ T6 r% d$ Y6 Q- s1) Starting the Motor + n4 X0 h: i+ J" i* Q
& E7 K3 G: D0 g' N: R+ VDisconnecting Means
6 h9 H$ Z5 w a" jAcross the Line Starting
* C- E0 s _! p BReduced Voltage Starting
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2) Motor Protection % {2 d3 J x8 b2 ~8 Y
9 S; k6 M' `# F% @; IOvercurrent Protection
' n# [* d$ ?9 w+ x8 VOverload Protection - R6 q6 O8 U9 x6 _; ~
Other Protection (voltage, phase, etc)
/ X- Q) N0 t. k% kEnvironment
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3) Stopping the Motor ' Z# G: O7 u+ V/ n. [& F! O$ B
- f0 L! W- g, v% k" I& zCoasting
7 w$ P/ a* O9 Z [8 b* q3 E% }Electrical Braking * ]/ k6 I0 C# A8 _- Z" j
Mechanical Braking + l6 w4 _( v1 ` Q/ E
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4) Motor Operational Control ; ]) Y. ?+ k9 P! @ X1 I
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Speed Control
: o; m9 j; t0 z7 S: H" WReversing
8 O; |2 r$ O: M! nJogging S. I/ l* b+ q- Z8 s
Sequence Control |
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发表于 2009-6-19 21:51
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