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ELECTRIC MOTOR CONTROLS : A& t7 T( A6 p# [4 @& C" ]6 B$ ~
1 x2 {% G a1 x' y! KOnce the proper motor is selected, understanding the many various control devices available and + N; V5 A- b$ }
their uses and limitations becomes an important part related to reliable operation and protection of
8 e' P6 T0 u) S4 ?0 s6 Lthe motor and the personnel using the motor. 4 y" `; a* Q9 \9 K9 m0 X
: Y, p7 D) s+ Y; T% Q7 iMotor Control Topics 5 Y8 F5 z9 ^; v
" p/ ^* B' W) ?( vThere are four major motor control topics or categories to consider. Each of these has several - ?6 W! P `+ m9 I0 ^8 X& h
subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor
2 C. D& v- r' s$ D- O1 Ncontrol equipment can accomplish multiple functions from each of the topics or categories.
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The four categories include: * K' |% Y% M0 y
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1) Starting the Motor
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Disconnecting Means
6 d; W, E+ Q3 W( [2 l2 `Across the Line Starting ' M- P/ F- }3 ~9 x
Reduced Voltage Starting 6 p3 d6 J1 w" K3 D
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2) Motor Protection
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Overcurrent Protection
4 p% j2 d* z2 c8 u8 D \Overload Protection
( ^+ K/ [. ?- Y5 D) M- G5 Q) oOther Protection (voltage, phase, etc)
( }8 j ?6 h ^- D F: Z; |Environment 0 P9 ~/ T/ M( }' `7 s
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3) Stopping the Motor
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( ~- _, f: l% J- v6 UCoasting - `& z6 r: c0 c- k
Electrical Braking
& I1 ]) l' z2 k: u: rMechanical Braking
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7 x. n% |2 ?6 o% A1 k, q2 }- ~* q6 e$ J4) Motor Operational Control & r% @) A# A) d" {6 P4 I" A! K
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Speed Control % A$ \$ x0 Z9 _+ j. B/ _
Reversing ) V+ ]* ^ N! }9 u/ n
Jogging
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发表于 2009-6-19 21:51
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