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ELECTRIC MOTOR CONTROLS
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Once the proper motor is selected, understanding the many various control devices available and
" w3 N7 N* m3 f2 c' R1 r6 A" xtheir uses and limitations becomes an important part related to reliable operation and protection of
. q' p- }2 Z& Fthe motor and the personnel using the motor. % _/ d; R% h3 k" ^- _$ f% ]
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Motor Control Topics # G F& D$ {4 n7 a" Z! W7 P* N
; Y3 h) C' S- ]) `# F3 l, cThere are four major motor control topics or categories to consider. Each of these has several
7 k. I! w+ s2 Z' U5 O" v( rsubcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor
& n# J6 e& Y1 A% t7 Econtrol equipment can accomplish multiple functions from each of the topics or categories. 4 n4 f7 h% }, @- W
% ]9 b% U4 I2 l) ~- @' MThe four categories include:
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P8 G; d6 v) H1 a1 T1) Starting the Motor
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9 K& v" V, G/ d- C6 x2 SDisconnecting Means
; h2 O% w4 T; Y, N# W+ J% dAcross the Line Starting # |! y! D1 i" d/ A: Z" D0 e6 c2 r F
Reduced Voltage Starting
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6 f% v2 _# G1 @5 a M4 z$ A2) Motor Protection
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% v" J9 E& _4 ZOvercurrent Protection
% p2 a7 y4 E6 H6 ROverload Protection ' c% Y0 m. ]3 s# i% g6 J( C
Other Protection (voltage, phase, etc)
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3) Stopping the Motor
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Coasting " } k) I! R( {+ [ ^; q
Electrical Braking
1 B0 Q' E. O" G# }Mechanical Braking
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4) Motor Operational Control 8 W2 q/ G( V2 U5 ?: b
J' Z1 f) _" b" M' c3 i9 ASpeed Control
0 h) X6 u4 c. v% N- @; w1 `Reversing + n U; g- l: u0 \" E' f H# I
Jogging
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