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ELECTRIC MOTOR CONTROLS : P* ?, x; B/ u! o) C6 p6 L+ v) d
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Once the proper motor is selected, understanding the many various control devices available and 6 T- C* h8 m5 a# O3 O
their uses and limitations becomes an important part related to reliable operation and protection of ) l, R1 U' D6 W, n* @- d% k
the motor and the personnel using the motor.
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2 c6 K. n+ T( e7 V$ S# cMotor Control Topics
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% @$ ]; q. _2 u/ I, KThere are four major motor control topics or categories to consider. Each of these has several Z5 m* p: S, T
subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor + N) U( U' y7 Y( L4 x: b4 a
control equipment can accomplish multiple functions from each of the topics or categories. 9 p/ E3 e) [# c* j2 _; }
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The four categories include: % q6 U7 l' I2 @+ S- p; `4 T
. h4 K' g1 M9 G$ x1) Starting the Motor + E* N; j% J' V
% S9 }8 c9 P5 g2 o' PDisconnecting Means
- w1 q, Q, d6 \) }Across the Line Starting ) N# f- u; H4 Z8 J+ A% u
Reduced Voltage Starting
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2) Motor Protection
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. n9 Y L0 \: d$ H0 {1 a; ?9 ?Overcurrent Protection ' Y9 K2 [& \( Y2 y, ^$ D. v0 A) R
Overload Protection # y& M* O9 l) h6 m
Other Protection (voltage, phase, etc)
! X7 n6 [3 Q# }: z" ^Environment
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3) Stopping the Motor
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# g z! j U# PCoasting ; P3 Z& m) y/ v& i% K0 |6 Y
Electrical Braking 5 w: L" f% Y% K
Mechanical Braking
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+ b8 l% L! S8 f4) Motor Operational Control
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Speed Control
& C$ @% M2 V. FReversing 1 c& {! M: ~2 {( T* A
Jogging % o' b+ u. u% y' v5 _
Sequence Control |
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发表于 2009-6-19 21:51
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