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ELECTRIC MOTOR CONTROLS
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; [ a8 Y& u' ^9 \/ dOnce the proper motor is selected, understanding the many various control devices available and
8 W6 ^ E6 m! I9 b4 }3 P6 e8 ]their uses and limitations becomes an important part related to reliable operation and protection of
- B: U: Q* Y' e( j9 F( K6 |7 Qthe motor and the personnel using the motor. " ~5 b6 S; n" t4 b! r! r
* w$ A6 q. w. X' M X3 E% x( MMotor Control Topics
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, n- c& P" {% `# @ i4 wThere are four major motor control topics or categories to consider. Each of these has several
# E/ p( H w+ B$ Q* \2 C2 T* Vsubcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor 7 W, i5 [/ `7 ^& V- O) J# k2 I
control equipment can accomplish multiple functions from each of the topics or categories.
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" F) s: W z; B) B" O, M3 nThe four categories include:
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1) Starting the Motor + c, `3 R) K0 ^# Y+ M* O+ t
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Disconnecting Means
) P- z% }7 j- G7 bAcross the Line Starting
- E* J0 [, A% f2 T) SReduced Voltage Starting
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' |; K! V5 F. [1 J9 O2) Motor Protection
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Overcurrent Protection 6 [1 U% [8 S B. i, \8 c
Overload Protection
1 v. D3 v' o; g2 L! S' n" HOther Protection (voltage, phase, etc) ; z# o0 E( ]: q
Environment
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3) Stopping the Motor
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4 U9 l& e4 t: w: p, F, J$ M/ V% fCoasting : Q3 |, q2 {8 \' b" o
Electrical Braking ) |4 e2 G/ e6 L. f6 W# y' W$ z
Mechanical Braking * W5 C; G2 j9 e
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( Q+ q3 M, f% ~, k9 X, K: m& X4) Motor Operational Control / O) s; f: k/ M4 c
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Speed Control 0 P- O# V8 \3 S/ v! t6 j
Reversing
- ? ?! i* R" E* nJogging
4 w' K' U7 k1 c: _+ Y0 i: TSequence Control |
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发表于 2009-6-19 21:51
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