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ELECTRIC MOTOR CONTROLS ( o" h& p* i' a% z- q
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Once the proper motor is selected, understanding the many various control devices available and & X" x6 B, G$ \9 Q. K" k
their uses and limitations becomes an important part related to reliable operation and protection of
3 O4 `* u) f. o) S( t. Pthe motor and the personnel using the motor. & P2 t& j7 a/ p8 g! }) z2 r6 @
( W3 I1 u2 Z1 t5 h6 }7 rMotor Control Topics
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There are four major motor control topics or categories to consider. Each of these has several
+ h, c7 t2 l$ g* {6 ^6 tsubcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor
2 R/ u6 S0 ?* i7 K! Lcontrol equipment can accomplish multiple functions from each of the topics or categories. 2 }$ Y. P( `; f \+ f! t$ j4 B5 U" J
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The four categories include:
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( J; Y, C) N& W' z( |# j# {1) Starting the Motor
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Disconnecting Means " E( H3 Q5 ~8 j9 z$ s
Across the Line Starting
+ ~: r' J& }0 K6 [Reduced Voltage Starting 4 O# M; m6 m, x' G3 F
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# c5 k$ z% c. x' N; Z7 S- X9 ?* B$ I2) Motor Protection ( U" j: T- A% @. y7 l' S/ P; W
5 z- x0 ?. a+ I. {Overcurrent Protection
& g. V; C+ P. \# W$ gOverload Protection
& O0 y0 _9 b% _+ k% J! Z$ b% H. |Other Protection (voltage, phase, etc)
( z% S- D& T7 {' OEnvironment 8 Y9 k2 `0 J- B2 g
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3) Stopping the Motor 0 H' D: E) a3 x& ~# H! T5 e* ^
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Coasting 6 ~9 M" g9 G3 T5 v7 o( l
Electrical Braking * E: k% G& y3 h+ j
Mechanical Braking
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4) Motor Operational Control ' X6 V; o+ H8 T" x K0 F
1 p( v/ `# V6 t }Speed Control
$ X: h* f8 T6 ~; x& O) ^5 A4 x0 NReversing
0 C" J3 a. b$ k% M# s$ PJogging
2 G4 i4 `- }8 I8 M# VSequence Control |
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发表于 2009-6-19 21:51
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