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ELECTRIC MOTOR CONTROLS
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" `) J+ x) v# YOnce the proper motor is selected, understanding the many various control devices available and
) O# e& {* g7 R, i0 C. ]their uses and limitations becomes an important part related to reliable operation and protection of
6 k+ d. B0 ?3 w1 zthe motor and the personnel using the motor.
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- j3 k4 f1 O( J% OMotor Control Topics ! j. R4 d( F6 |! l/ E
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There are four major motor control topics or categories to consider. Each of these has several
1 ]5 |& t: }& ]% y8 M8 Ysubcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor $ x ?1 a* m r2 p
control equipment can accomplish multiple functions from each of the topics or categories.
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1 V, s, y2 X% M {1 N6 ~The four categories include:
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1) Starting the Motor - z( G6 ^" N' z0 y9 X% D
! M+ g" k, I" W% Y7 rDisconnecting Means
5 R7 G& r6 |$ p. m4 xAcross the Line Starting
) W4 | ?$ J( R# b q% x8 f, @Reduced Voltage Starting $ A5 `! d' H) w" T) g
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! {' P! i: T$ K6 c+ Q0 I2) Motor Protection
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- w" J% M; ?! X3 V6 l/ QOvercurrent Protection 6 S" n; D* O1 r9 { l' ~
Overload Protection 3 P& s$ _" P; k0 R0 L. L m3 Q9 R7 X
Other Protection (voltage, phase, etc) $ M# o) Y2 l: Q( v
Environment . T X1 y* ]) ^, {8 d4 a
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, K# B' N; B4 u' ^2 N C! B3) Stopping the Motor , l/ {! n/ k% a1 d0 l
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Coasting
7 P! c4 M' j& Q0 r5 f: {- i/ r% bElectrical Braking
+ j e6 O+ J' \2 D, k4 D. O" JMechanical Braking 4 W- f/ L, N4 d* K
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, s5 r \6 ]) v4) Motor Operational Control 3 a$ U% T2 {) G$ F
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Speed Control 4 y5 j% }- W" ]
Reversing # L/ @- K/ B6 `
Jogging
5 \6 ?- U8 ]/ u; E& a* w: LSequence Control |
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发表于 2009-6-19 21:51
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