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ELECTRIC MOTOR CONTROLS ' @& b/ K y; _8 b @+ c4 ]
j/ l+ Z" x6 j9 T- g# YOnce the proper motor is selected, understanding the many various control devices available and , V! v8 h# \2 [, m% s
their uses and limitations becomes an important part related to reliable operation and protection of , _* H! }! h" z; M ]6 J/ x
the motor and the personnel using the motor.
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2 ~( u% T1 I% l* O7 ]0 L5 a( v1 J, ~Motor Control Topics
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There are four major motor control topics or categories to consider. Each of these has several
8 ?/ G1 q: \1 w1 o3 ^subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor
2 t1 Q. u3 N9 U2 Zcontrol equipment can accomplish multiple functions from each of the topics or categories.
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4 v1 y+ l$ z: }0 R% A- hThe four categories include: # ]' E2 c8 u8 e7 P/ l% d
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1) Starting the Motor 4 i/ A$ O1 D& d+ @0 K6 W0 ?
. A7 o6 r, e( K& y( u, LDisconnecting Means " M* \' j7 d/ D: u4 y/ C
Across the Line Starting
* x$ @9 r; z; {( V0 h5 V# mReduced Voltage Starting
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" o6 f. O$ I. _: O% u) {2) Motor Protection 7 N9 V* `5 w/ ^8 @" i0 `4 l- w
# f9 {. ]8 E8 \" _+ JOvercurrent Protection $ w) p. C9 ~+ G3 o4 x( T4 Q, D
Overload Protection / U. L2 b( f7 Q4 Z) V
Other Protection (voltage, phase, etc)
" q' r# [: u4 H M$ `6 vEnvironment
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( N/ J/ |* d% e0 @3) Stopping the Motor
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$ | @3 l2 V) x1 sCoasting # s3 U2 E# n( D
Electrical Braking + B8 Z) _+ G6 _( l+ I& S( F, {
Mechanical Braking
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4) Motor Operational Control 3 f+ v( `' B$ g! [
6 G) R) e/ s- eSpeed Control ; g3 p! B- r4 e) P* R
Reversing 0 \+ |/ \1 ?" ~6 G4 b5 S! F& R
Jogging
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