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ELECTRIC MOTOR CONTROLS * Y; c! T4 w6 ^& l% u% C
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Once the proper motor is selected, understanding the many various control devices available and
, Q6 G, o* p8 D4 Otheir uses and limitations becomes an important part related to reliable operation and protection of & ]" E, b0 K8 f) ~0 q+ h
the motor and the personnel using the motor.
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Motor Control Topics
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. G6 w8 V* q6 B* [; g* z' |There are four major motor control topics or categories to consider. Each of these has several 7 Q# r* D4 T) o. Y- U2 S8 H
subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor
4 ~$ ~$ S; S8 e: \- b' t2 ]control equipment can accomplish multiple functions from each of the topics or categories.
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9 Q g2 v0 L a4 w3 I% `The four categories include: % U) i; }9 I2 L+ B- Q! t$ W
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1) Starting the Motor
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+ j1 X1 l R+ z& s8 U, h4 ]Disconnecting Means
- L1 h! L. Z G5 f. d: GAcross the Line Starting % ]+ f; r' I& v/ f7 n# L
Reduced Voltage Starting + m5 f& H9 H: g3 ]& w
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2) Motor Protection & h5 T- W2 [% a; k
% s1 x; _: E% w4 h ]Overcurrent Protection * n" T; P. d1 U' T( |
Overload Protection
0 p; e& ^2 K: ~9 }Other Protection (voltage, phase, etc) % _" [9 R; M; y" L! s
Environment
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3) Stopping the Motor . |/ W/ f0 v% \2 Z/ L) H8 V
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Coasting ( j' O8 K. q6 W$ O
Electrical Braking 4 A5 r" D4 T( Y4 c
Mechanical Braking + D+ o1 @/ G# |1 @/ Z; _
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4) Motor Operational Control
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; ?$ u$ w5 b3 H( b. t) d9 P0 w! [Speed Control 1 j7 J9 A& \2 d3 H3 h5 ?
Reversing # ~% C1 l/ l( V2 f7 L
Jogging 3 Z, L8 u) Q, i0 V
Sequence Control |
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