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ELECTRIC MOTOR CONTROLS - v8 S1 F* n! C" l. t9 q* @7 o
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Once the proper motor is selected, understanding the many various control devices available and e5 q0 ?: T0 t/ m8 K4 M' q
their uses and limitations becomes an important part related to reliable operation and protection of
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Motor Control Topics - \9 H" M" l* d( |
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There are four major motor control topics or categories to consider. Each of these has several
+ I/ g. k j: q. N" m4 Fsubcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor
/ ?3 [6 y- m9 v8 zcontrol equipment can accomplish multiple functions from each of the topics or categories. 4 L; F2 H/ i0 Z0 ~+ }
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The four categories include:
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( B+ \1 M" a L* C% g/ E A1) Starting the Motor
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Disconnecting Means & k& J& E0 }$ S& @9 O
Across the Line Starting 7 l! O- g ?8 g
Reduced Voltage Starting 0 C2 w' e! N; N2 P! F
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- L# i- G6 \1 n1 S: X7 s6 {, d8 E* R2 r2) Motor Protection . K/ p, b( _* p. U- I; D- i
) C& S& n) Z3 G+ a' ZOvercurrent Protection
6 d& `( ]- t+ e' u O7 h5 lOverload Protection
7 O. d2 |* @. F* ~. ?) hOther Protection (voltage, phase, etc) 5 Y0 A. s$ W7 p8 m/ u4 g
Environment
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/ {& f; t. Y, _4 e: [3) Stopping the Motor 8 t3 J; A3 ^, ~* J: z/ d- R; s. P6 f
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Coasting
& W- l% S0 i2 a2 C0 G: SElectrical Braking
7 `6 T1 \" ] `1 f1 W8 GMechanical Braking # n5 g1 y& a$ G4 r( k4 Q3 X
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. y$ Z- N/ U, u4) Motor Operational Control
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" L/ S2 x' c2 U- q% a' m- JSpeed Control " ?' B: ^! m; V; y6 B! S5 n
Reversing
7 o; }9 w/ c0 H, B& A6 eJogging
/ t$ F7 H8 m% f7 R6 i4 }* ?8 |Sequence Control |
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发表于 2009-6-19 21:51
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