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ELECTRIC MOTOR CONTROLS 3 h& M8 o: S& a9 m! X9 f
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Once the proper motor is selected, understanding the many various control devices available and
4 I! P7 ]8 X- N0 B0 |: itheir uses and limitations becomes an important part related to reliable operation and protection of
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% m" D/ ^! H, v& P5 OMotor Control Topics $ l2 S! c( d4 i6 z5 e
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There are four major motor control topics or categories to consider. Each of these has several
: b Q; O# B' @0 @subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor 0 F8 P* a. {; }0 I& C0 B2 T
control equipment can accomplish multiple functions from each of the topics or categories. $ t* v2 U1 o& E k# R
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The four categories include: & Q& ]/ e( Y3 I, n
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1) Starting the Motor 4 q0 S: H4 k; D* G
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Disconnecting Means
, K; [7 a% z+ `Across the Line Starting 4 Y# ^7 f7 r% H3 p9 ~/ F. j L) h
Reduced Voltage Starting
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2) Motor Protection
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Overcurrent Protection
2 }1 I( o: S9 A# Y* b& rOverload Protection
/ D- p1 Y- H1 K' j( MOther Protection (voltage, phase, etc)
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3) Stopping the Motor & W6 V' Q2 \3 G7 C% w$ S! r: z
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Coasting
3 Y9 |- y! G1 [$ \1 w3 \$ oElectrical Braking ' W: ~. q8 m) n! e& ^0 z
Mechanical Braking
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/ v) E" M( N; r f, [- g4) Motor Operational Control + \9 h; G) o1 r
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Speed Control V# s7 ~9 h2 Q: L7 o% ?2 T
Reversing 0 E& z" U8 K& S" o
Jogging % J' m# F) n6 m6 E& ]
Sequence Control |
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发表于 2009-6-19 21:51
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