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ELECTRIC MOTOR CONTROLS Z- R+ b# S* J* d. R2 j0 c8 E# `
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Once the proper motor is selected, understanding the many various control devices available and * K9 l! U9 E2 |3 i/ X2 c3 W/ }2 p
their uses and limitations becomes an important part related to reliable operation and protection of
: F9 W8 M5 u. T" j P3 |0 V# |the motor and the personnel using the motor.
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Motor Control Topics
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There are four major motor control topics or categories to consider. Each of these has several # z' w5 O* @+ C5 L
subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor
* X5 s; J; r0 Q+ I% Ncontrol equipment can accomplish multiple functions from each of the topics or categories.
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& O' q" i8 S2 h. UThe four categories include:
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# `) p0 E$ V; {! f6 G& u8 z1) Starting the Motor
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Disconnecting Means
* N1 e/ m* k8 I, Y9 hAcross the Line Starting
) g" o* \1 C' ]2 HReduced Voltage Starting 4 S8 B2 v- r' Y8 I. v' y
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2) Motor Protection ) X- M. `: p" [
" h5 P8 V# O- ? ~7 m k/ i2 nOvercurrent Protection 0 v1 B/ m6 f$ M8 ^, s& s3 `5 g- s
Overload Protection / Q; O' c6 Z/ m( T
Other Protection (voltage, phase, etc)
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9 K6 S1 s9 c9 t# B0 g; ?3) Stopping the Motor
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Coasting % B( L6 n; k1 ?9 ~+ _9 b
Electrical Braking 4 d- Q' E0 u3 {; B6 W
Mechanical Braking & v3 ^$ |) p% V7 D! W
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% `5 F5 l% I( [0 p9 X7 @5 Z4) Motor Operational Control
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* c- @3 A1 n5 eSpeed Control
' Z9 g: T5 y4 O1 |/ dReversing * x8 p0 |0 o/ X0 U+ G) {/ u
Jogging . b5 u( U6 A5 ^) o2 {* d
Sequence Control |
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发表于 2009-6-19 21:51
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