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ELECTRIC MOTOR CONTROLS $ S8 Q. N0 u! s; x
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Once the proper motor is selected, understanding the many various control devices available and
* K% T+ R" `# N8 h* [their uses and limitations becomes an important part related to reliable operation and protection of 5 R* F& ~7 a) ^# h8 D/ e% I8 s. m% b
the motor and the personnel using the motor. + t' _# r% {- g N) j
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Motor Control Topics
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4 c% N0 ]5 _: \/ C/ n- c y/ KThere are four major motor control topics or categories to consider. Each of these has several " o6 E" n) N! f* X
subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor
! q+ G$ \6 p. |' }$ hcontrol equipment can accomplish multiple functions from each of the topics or categories.
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9 {) s- E w/ e1 p3 t4 X3 L* xThe four categories include:
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* K+ A. ^) X2 d2 G( y) i1) Starting the Motor
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; F6 z1 `7 S1 D' C' r! KDisconnecting Means & d2 `$ `* g% ` E. A: t
Across the Line Starting 2 q% @' X" _. i @9 A
Reduced Voltage Starting
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" s7 Q/ X/ }8 t* F2) Motor Protection 7 x( \6 T P8 i6 {4 ~6 L# g1 \" m! m
' x, `: E7 y* x: b5 z6 aOvercurrent Protection ( A/ t6 ^: ?) b0 B0 f
Overload Protection & U4 R: C- R" t7 m( X6 H
Other Protection (voltage, phase, etc) 1 o( u: a8 X9 {- C# o/ Q r1 q
Environment
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& H0 ?# F( u5 N3) Stopping the Motor
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( M4 y8 k+ s) {$ \Coasting
0 a- k* ` e. e2 _, C# a8 EElectrical Braking # ~: }9 I# `5 ^+ J
Mechanical Braking % X z1 z; j8 F1 C5 G7 u
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4) Motor Operational Control * y U( l8 I: ~& d I, X( E
( }: i0 \+ U2 o- RSpeed Control
- A! e3 ^" \7 F$ Y0 UReversing
, ^. d$ d" f& R% iJogging & ~, }% H3 G3 Z4 g1 X
Sequence Control |
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