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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
' M) l0 p( r; i2 N! R. i# ^' ntheir uses and limitations becomes an important part related to reliable operation and protection of ( u" ^7 S8 `5 M
the motor and the personnel using the motor. # c: ~9 q% f7 s" M2 Z
; `% k- w3 `+ j( XMotor Control Topics 4 n5 l. h& ]# n( q) Y3 ]
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There are four major motor control topics or categories to consider. Each of these has several
$ w0 V* ^* L3 F0 [* X" H0 Ksubcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor % _$ j* I. }4 _5 o4 D% B; I
control equipment can accomplish multiple functions from each of the topics or categories.
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The four categories include: ( b t5 @7 M0 `9 o5 P
C$ s& d$ S* B7 V3 c6 _1) Starting the Motor % \, t4 t6 r0 t+ C2 U
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Disconnecting Means
& s- S0 } C, b; |9 r" R! {. cAcross the Line Starting
8 t; N9 w1 q5 R( y$ U: r! IReduced Voltage Starting 3 l- Z3 s9 r( a3 }* |! [$ d9 m
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2) Motor Protection 8 M+ a3 y6 T R9 C. X
h& w% ^# o% f" X9 b' uOvercurrent Protection & d# H+ H. G4 y
Overload Protection + J& g. _; B1 ~# v8 s- r
Other Protection (voltage, phase, etc) % L. E: ^+ N8 i4 ?1 p7 U4 [
Environment 0 g$ J3 R4 I, F3 G- k; Y& C
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3) Stopping the Motor
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* D- j$ O$ H( bCoasting
: ?6 p) q! p6 ]4 PElectrical Braking
0 ~0 V6 x a, c6 M; h" jMechanical Braking , m, q" H6 P6 R: A3 [
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: m2 H+ v7 o L( u; c4) Motor Operational Control }% s. I* @6 N: d# E; \
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Speed Control
% {( T# w9 Q* A( v6 ~, iReversing ; c- c/ ^0 D6 T: o
Jogging
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发表于 2009-6-19 21:51
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