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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 $ x3 K- c! _5 w+ S: `# p3 t8 j
their uses and limitations becomes an important part related to reliable operation and protection of
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Motor Control Topics 4 v7 ^9 b& {; F* t/ |
0 S4 b: }: ^& ~There are four major motor control topics or categories to consider. Each of these has several
' K, j6 n9 s. f. |" d# W) ssubcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor " O6 ~7 }2 M/ [6 ]
control equipment can accomplish multiple functions from each of the topics or categories.
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6 S, M. M! }+ _The four categories include: 0 s ]9 M+ u' E/ x. ^, P$ J
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1) Starting the Motor + ]: A. ^7 J6 q/ ^
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Disconnecting Means ' }8 z' t+ v0 h; v# ]
Across the Line Starting ) `: V5 V8 l- r
Reduced Voltage Starting . j' J( K7 Z9 C- N9 c
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2 _3 G& b$ h; J/ S9 b+ I5 U4 X) I2) Motor Protection ! r. A \. I& p8 s6 c. ?
3 {' c4 t/ \+ KOvercurrent Protection / w1 V* s6 g8 a0 V& u" v
Overload Protection ) l/ l# p3 ~) q8 h) H. R' P* d
Other Protection (voltage, phase, etc) 8 N' r- n( ?: P) r% O5 L
Environment " ?4 @2 t2 P* l. v. a( i: A# k+ }/ K
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3) Stopping the Motor
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g) V# z4 F; j8 K) dCoasting 1 l7 d* ~8 b1 K7 G0 Z4 j( O) P4 k
Electrical Braking
4 h# _1 D1 G1 ]8 Y# G8 ]Mechanical Braking " j4 x3 q$ J; I9 N: D9 d9 U
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4) Motor Operational Control : `0 G* f3 J' h; m g
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Speed Control 5 b: U4 U: m& C( U
Reversing
7 M( A$ V; P+ LJogging
2 }5 H( H' R& y& k; h$ I% D, f5 V oSequence Control |
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发表于 2009-6-19 21:51
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