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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 ' d4 v0 F$ i7 F. b8 I. D0 C3 J: `
their uses and limitations becomes an important part related to reliable operation and protection of 8 K- ^$ q5 P7 ^3 k
the motor and the personnel using the motor.
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Motor Control Topics ( Q! H% r2 V6 H$ h; v$ G
5 B# T. V6 o4 |8 ZThere are four major motor control topics or categories to consider. Each of these has several
0 k, ?7 }" L0 ksubcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor - Z: @1 k2 v+ `8 q0 Q
control equipment can accomplish multiple functions from each of the topics or categories. 3 u, A& t- J3 ?
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The four categories include: % D+ h' G' V, f8 w. s
- }0 Y( A& R. C1) Starting the Motor
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; h7 [1 ?& L O7 K' @0 |Disconnecting Means 3 e- f5 N/ |3 @+ m* Y' ^
Across the Line Starting
5 ]* N; p/ Q- Z6 J+ w" Z* _Reduced Voltage Starting 2 X$ L% U6 z* A, @, ]: A) S" {
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2) Motor Protection
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; I) G% J- j: O4 ~Overcurrent Protection
2 g F6 Y1 s$ h6 |$ pOverload Protection
6 F. v; g+ o l3 BOther Protection (voltage, phase, etc) 7 G# Y7 D1 l9 U- C' R6 o
Environment ! |( m) Y! ^1 r( p) l$ T
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, |1 B6 R5 P* h5 b* X3) Stopping the Motor 7 c$ W3 {- E3 {0 @0 ?5 g
0 [9 ~2 u, i$ e1 O3 ECoasting
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' s2 \; g" n" D0 oMechanical Braking + n/ U9 X: D0 [' s$ I4 C8 X0 y
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1 ?" F! p% R; y% Y4) Motor Operational Control
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1 w2 d) H9 U2 U6 r5 I6 WSpeed Control + E( n$ i& L8 V4 p
Reversing - T5 o1 F6 m" Z \. \5 y+ o# `
Jogging
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发表于 2009-6-19 21:51
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