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ELECTRIC MOTOR CONTROLS
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( y+ _1 b4 u4 L$ ~% s2 V* hOnce the proper motor is selected, understanding the many various control devices available and 2 I6 s3 l6 h3 \' D" ]
their uses and limitations becomes an important part related to reliable operation and protection of 9 a1 z1 [: P3 `# ~5 [0 b
the motor and the personnel using the motor. ) x7 q! q4 W) z! Y' ]- u$ h
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Motor Control Topics
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# [$ [7 s2 C! O( a+ x! A# KThere are four major motor control topics or categories to consider. Each of these has several 4 G: n* k Y1 S! ]. L
subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor 7 [, z. Z3 G% ?1 e! d
control equipment can accomplish multiple functions from each of the topics or categories. ) g' {6 R/ a" w
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The four categories include: 1 o+ v4 m7 @1 Y' H. G- e
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1) Starting the Motor 8 a5 V8 F, N, R6 ]* |9 Z
2 K$ ]& v% q4 w# A' r3 @7 FDisconnecting Means $ P. K3 H G/ h& ^' a+ H
Across the Line Starting
6 J8 n3 s/ M/ k, A9 b; s& kReduced Voltage Starting ' ?1 i$ R4 ?# S* h8 g# q; A
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2) Motor Protection 5 j1 u$ X% ]: M) |" P2 _
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Overcurrent Protection ; v7 Y. A7 n- T+ ]5 t$ Y8 s" h7 G
Overload Protection 9 G1 _# o* |& B: o+ \5 A
Other Protection (voltage, phase, etc)
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# o" V' t0 D; ]) {: `3) Stopping the Motor $ J7 | \6 I K$ v$ ^* q
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Coasting
% Y; }* Y9 z- A) t% Q TElectrical Braking
" U* B- `- _/ _3 v- ZMechanical Braking
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4) Motor Operational Control 4 M& ~8 i m. _
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Speed Control : v, d: T8 v* Z8 j
Reversing
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Sequence Control |
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狗仔卡
发表于 2009-6-19 21:51
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