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ELECTRIC MOTOR CONTROLS 9 j# @, F2 r/ z3 d; ?
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Once the proper motor is selected, understanding the many various control devices available and + W+ c- B. s( u3 U
their uses and limitations becomes an important part related to reliable operation and protection of
( q- x$ R! e0 I2 sthe motor and the personnel using the motor.
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( X# k" f' @$ n0 F) V+ @( vMotor Control Topics
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There are four major motor control topics or categories to consider. Each of these has several # r4 n9 t8 t6 O7 Z: H0 r3 X7 J4 X9 l
subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor # O" m' b* w6 W% z
control equipment can accomplish multiple functions from each of the topics or categories.
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# ^ n" o( N( r4 ?$ dThe four categories include: ) n. p$ A" ?: p+ J" m- b
7 }0 G! c; L- J1) Starting the Motor 7 r. z0 q8 E- I" _' _3 k1 f% P: b
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Disconnecting Means : h$ _; C- k3 F' ~
Across the Line Starting $ c! F, N5 s$ Y" ~* S2 P. n) D( A
Reduced Voltage Starting
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2) Motor Protection
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7 q0 V2 h, |6 X! R; EOvercurrent Protection 1 Y3 H H; q7 p% q& _8 H7 R
Overload Protection , {8 e: q7 m9 ~# T9 q9 F# r
Other Protection (voltage, phase, etc) ]* ^" n) s* ]) o
Environment 0 F% }+ j: W* p! F* {8 x! L
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1 _1 f- @- c+ \- M% z5 X; x$ O) B3) Stopping the Motor 3 l5 a# q4 B; I1 w- d
: g: q2 X/ R( }6 p, NCoasting
! L$ a9 O" Y, f2 a) f- OElectrical Braking
& i6 o$ q7 }: O8 e0 | J2 jMechanical Braking
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4) Motor Operational Control
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4 Q3 j: z4 f% e; G4 ?2 V6 p( jSpeed Control
" @7 f( L, r2 wReversing
: Z e3 u. D8 [$ Y# A/ |1 ^ U& ?Jogging 9 ]1 w* }2 K3 ]! I
Sequence Control |
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发表于 2009-6-19 21:51
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