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ELECTRIC MOTOR CONTROLS
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6 r( i( U: t6 v, A1 D% C" OOnce the proper motor is selected, understanding the many various control devices available and " T8 t' x) E- F- Z0 a( @9 G- J% E
their uses and limitations becomes an important part related to reliable operation and protection of
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Motor Control Topics
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# [8 g. e6 F/ k8 ?0 k+ \* Y5 s2 oThere are four major motor control topics or categories to consider. Each of these has several ! a* w9 ^: H/ ?9 N
subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor 6 O8 Z$ x6 F7 Z) b U! {* V
control equipment can accomplish multiple functions from each of the topics or categories. / ~1 G6 T. v' ^8 N' f6 p6 ^
. {7 s7 y$ ~: f0 P! SThe four categories include:
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6 ~; T/ k6 l7 i ]/ [: T: T1) Starting the Motor $ ^ P! x; t! k. A
( q t( i. U7 _" @$ k/ o! mDisconnecting Means
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Reduced Voltage Starting
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& A6 @' D2 N) T/ n8 B2) Motor Protection 3 f$ v9 w, T3 o; |
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Overcurrent Protection 2 K, l5 X- u# m; ~9 v
Overload Protection 6 E7 ~8 U+ V1 N6 t; B+ x4 T
Other Protection (voltage, phase, etc) $ o: n0 m5 D. J" w
Environment
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3) Stopping the Motor
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Coasting 0 _, w- `' a5 O- A' I _: r/ }- S
Electrical Braking
2 l5 t) a3 k+ v" Q) J0 OMechanical Braking
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4) Motor Operational Control
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1 `: B7 a. U' o/ \' w. [ B L. cSpeed Control : i7 X- \, `2 a7 @
Reversing 2 h: J* ^% ~+ @( Y+ s
Jogging
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发表于 2009-6-19 21:51
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