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ELECTRIC MOTOR CONTROLS
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1 v% W# T8 H MOnce the proper motor is selected, understanding the many various control devices available and
; f: h" |7 x8 A/ Rtheir uses and limitations becomes an important part related to reliable operation and protection of ; f4 ]9 z" ~( O; g' ~! T t# D
the motor and the personnel using the motor.
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6 K% K3 _2 v3 s( S$ rMotor Control Topics
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1 m! a. E+ V' `2 @' E! Y. `$ DThere are four major motor control topics or categories to consider. Each of these has several
9 X7 u9 h6 a) `" D) r2 n& I$ Osubcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor 1 Y6 H8 i7 W# I6 D0 D$ B
control equipment can accomplish multiple functions from each of the topics or categories. 3 X6 |3 T# j6 L7 }( M; B9 v+ W
8 n5 F8 M$ M+ m. e2 ~The four categories include: 7 ?' r* Q: U: N' j' a
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1) Starting the Motor
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Disconnecting Means " J, v" W$ ~3 |9 \; Z% b
Across the Line Starting
+ E6 Y! I- u" o# r$ Z, [. w, ]Reduced Voltage Starting 1 B% d; D: m( \+ R2 c: C: K9 _
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2) Motor Protection
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' o1 F% z; N; U/ c0 y) NOvercurrent Protection 1 R+ W/ _9 m5 O5 v4 w. L% l
Overload Protection 2 t4 I) H( }; w
Other Protection (voltage, phase, etc)
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3) Stopping the Motor ( O: }( m: ]( ^
, [" g$ s3 d- A7 E, iCoasting ' r: Q; x+ [2 Q
Electrical Braking 4 h; V) q+ \$ I" _9 o
Mechanical Braking 8 I5 w* L& w) m* l( M3 t
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: N0 \( F) v& H& q9 E3 W4) Motor Operational Control * ]' e9 Q* n* U' B9 d* |( I
* R1 y8 a* {5 r- ]Speed Control % d4 U+ j) U# }; S
Reversing 5 x/ Y, ?5 o8 d0 k; ]% A6 v
Jogging * a. Y) z0 W5 y9 t
Sequence Control |
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发表于 2009-6-19 21:51
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