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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
! ^$ p6 g6 a2 x3 S% c% e- Qtheir uses and limitations becomes an important part related to reliable operation and protection of / V4 ?2 M6 r* z- W5 q
the motor and the personnel using the motor.
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Motor Control Topics
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# \2 i/ {7 _7 c, k `6 b2 BThere are four major motor control topics or categories to consider. Each of these has several
) l6 Z% W* X& G; }. lsubcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor
" B* { h: @1 y. ]control equipment can accomplish multiple functions from each of the topics or categories.
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The four categories include:
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1) Starting the Motor
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$ _& @( ^6 C' u2 Y0 VDisconnecting Means # l, A# x% s0 v; O
Across the Line Starting
& M' P9 k, G0 a7 w$ q( E7 ]' zReduced Voltage Starting
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7 W/ K! j" [1 r1 d- n2) Motor Protection * O3 F P# h# {* G8 L
_$ r) l' [* I+ c% t4 |Overcurrent Protection
( O; x6 X( h2 Y4 D+ COverload Protection 0 G0 B* W8 B7 d. t: p" u
Other Protection (voltage, phase, etc) & t6 L2 t0 p( g7 t" T. {, I' ^& ]
Environment ; e# h! c. k" x
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. Y% W. u8 a7 R( p! @; s3) Stopping the Motor
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Coasting 5 N' ^& }. T9 [3 M1 \% ~: ?
Electrical Braking 5 O1 A( b, }$ [$ X6 g
Mechanical Braking
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4) Motor Operational Control 8 V" v) S. Q0 Z
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Speed Control / S3 _1 |% i, _: ^7 \7 \( K
Reversing 7 M5 V! G7 h6 H t9 y
Jogging
# e% }1 ~6 ?9 l+ b2 wSequence Control |
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发表于 2009-6-19 21:51
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