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ELECTRIC MOTOR CONTROLS 5 N: g4 q3 B: i- a( g) K- c
8 h8 f0 `4 ^" p) d" VOnce the proper motor is selected, understanding the many various control devices available and ; U @0 l' [0 x% s l5 X
their uses and limitations becomes an important part related to reliable operation and protection of
8 e$ p3 o7 ~! \2 wthe motor and the personnel using the motor. * I1 n T/ |+ @% d5 R5 \
- C, Q; p3 u8 wMotor Control Topics
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There are four major motor control topics or categories to consider. Each of these has several , e2 V9 R0 ^9 H8 x5 w' O+ c
subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor
9 Z) |8 i" L3 ^/ z2 z% }- y4 O. d2 Dcontrol equipment can accomplish multiple functions from each of the topics or categories.
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The four categories include:
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1) Starting the Motor
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Disconnecting Means
3 m: E5 t: k% H! l1 c4 O7 `Across the Line Starting " n5 j2 g" h7 o# ^* Y
Reduced Voltage Starting + m; W/ s. f9 \$ u3 x- R7 e
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% t3 k" H: A( B& l2) Motor Protection 7 L. B, p4 H# \1 ~# O
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Overcurrent Protection k3 ]. v' V, h4 e3 ~9 V
Overload Protection * H. @2 B* U7 _" f! }
Other Protection (voltage, phase, etc) 2 c0 S5 X, C) v8 [4 |8 E
Environment
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; p, k3 o- F) e: q2 [9 b3) Stopping the Motor
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Coasting
2 E; j: }' l# @( uElectrical Braking
' X1 F) ?1 L# ~8 @' DMechanical Braking
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4) Motor Operational Control 7 F9 I, Y4 q: b( c" `6 ^7 V
6 w7 n$ F2 [3 G) A1 l" J5 ?9 Q, wSpeed Control : m( \8 ^" P, S
Reversing 9 w9 N9 @4 r+ g% Z: j( V
Jogging
3 d5 l8 p! G/ r. k+ BSequence Control |
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发表于 2009-6-19 21:51
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