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ELECTRIC MOTOR CONTROLS 2 t' }5 I+ s4 ]6 z
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Once the proper motor is selected, understanding the many various control devices available and
) t# s2 l+ ~! {& Rtheir uses and limitations becomes an important part related to reliable operation and protection of
5 _- `: a- x: a$ w' H3 q- sthe motor and the personnel using the motor. # a, n; w; d' Z
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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 : D2 b$ b8 W1 e5 e/ h* q) K. `
subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor $ Q7 J6 `7 V& h" B; B+ k) E
control equipment can accomplish multiple functions from each of the topics or categories.
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8 }" _ Q; N! J: bThe four categories include:
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% V$ f# K- h# h& O# V1) Starting the Motor
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Disconnecting Means
2 x$ }+ q2 d0 D2 ]Across the Line Starting
7 B8 `4 j7 p J. QReduced Voltage Starting
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( D# Q9 | k7 m& U2) Motor Protection ' m* t, {" N. u1 F8 A3 h
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Overcurrent Protection ) |9 T3 ^5 D5 \. B. N) g* \# q
Overload Protection ! P1 p/ H \& {9 x8 x4 H
Other Protection (voltage, phase, etc)
0 Z3 t/ S9 T1 u. J1 z2 wEnvironment
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& m2 i# e8 M" K1 C/ f8 c0 f3) Stopping the Motor
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3 [8 G9 ~$ z+ h8 P1 I. nCoasting # s8 u0 ^6 a5 G! o3 s/ ?) a, K! v- {1 S
Electrical Braking
) U0 P7 E, X! { Q& m) bMechanical Braking - M) o! Q8 ~! B" J/ T' b
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+ M: O& b. ]" g" e2 K4) Motor Operational Control + A1 k) w3 ^; [8 ]" \( [& B
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Speed Control 8 W# s$ a, S2 L1 p# B9 I
Reversing
, [ Z$ P7 o) k* cJogging
; Z/ N5 A0 \2 U9 K- TSequence Control |
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发表于 2009-6-19 21:51
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