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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
- Y8 f4 v8 j! j8 _) h7 otheir uses and limitations becomes an important part related to reliable operation and protection of 5 [4 O* l, O$ Q# Z+ F" L: }0 B
the motor and the personnel using the motor.
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Motor Control Topics : V( m" a( j# ^) W! O: u& e; n
: F9 y2 c m3 [' Z- DThere are four major motor control topics or categories to consider. Each of these has several ; u6 S3 P! Q0 |
subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor 5 F+ R$ {4 m% P2 i: a2 S0 R; x
control equipment can accomplish multiple functions from each of the topics or categories. . P/ [* H% Q0 t8 k+ M
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The four categories include:
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1) Starting the Motor . Q8 c# K2 Y) \2 c( W9 Q4 r
; J1 ?1 f; S3 g4 [: @Disconnecting Means " j) G. e. E# K; o
Across the Line Starting
: o, a( }: l9 Y1 u. BReduced Voltage Starting 4 }6 G: ~! D& u0 O3 u" m; v
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2) Motor Protection
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Overcurrent Protection ; A' B1 X; J3 P: h* l* ]
Overload Protection
6 d+ i" r/ O1 j) ?. lOther Protection (voltage, phase, etc)
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3) Stopping the Motor
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( Z* H, q6 f' _- |Coasting 0 \2 `. ~4 f+ X5 X( s
Electrical Braking 4 O5 E v Q3 o1 I& |* j% ]. R
Mechanical Braking
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4) Motor Operational Control " k' | a8 h5 D6 l$ U' T9 f0 Q
6 S0 ?: ?7 h9 E# E! w, TSpeed Control - p: ~" I/ n: X$ |/ x
Reversing
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Sequence Control |
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发表于 2009-6-19 21:51
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