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ELECTRIC MOTOR CONTROLS 2 R! o& ]% U/ {2 w- a1 @% G
$ \# d: [/ `0 |, zOnce the proper motor is selected, understanding the many various control devices available and
/ ?: ]0 l* c2 Ltheir uses and limitations becomes an important part related to reliable operation and protection of / } `4 u6 K- W1 _
the motor and the personnel using the motor. : S# U3 g0 C1 k, b d$ d7 }/ o
4 t9 L0 S( q0 e5 z" C6 b7 G0 P: aMotor Control Topics
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( @/ H5 ?4 x2 x) z( H1 w9 kThere are four major motor control topics or categories to consider. Each of these has several
8 e5 k$ h- {& p: _3 ]/ y) dsubcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor
' _+ Q5 a S: q3 S$ J1 E5 o$ Y+ ^. ocontrol equipment can accomplish multiple functions from each of the topics or categories. - t2 Z8 S6 t! ]3 K, i, }
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The four categories include:
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- }" T0 `/ N( @6 x8 f$ V$ H1) Starting the Motor
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Disconnecting Means G. |# K% V2 f' J7 a
Across the Line Starting 9 Q" y5 W- Q. d, w, o
Reduced Voltage Starting
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2) Motor Protection
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" q5 G/ N- q1 ^Overcurrent Protection + z. Z% g6 R3 k2 s6 R
Overload Protection 7 z" X: S6 r4 M
Other Protection (voltage, phase, etc) $ O; ?0 R3 p" h( u. }& }+ ? X
Environment ( g1 p- Z1 w" a
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0 R& m; Y6 }# n' Q, b+ Y( Z3) Stopping the Motor + [& [3 ~* r# Z. D& K. i" I/ s/ R
( I8 W( o* k1 y7 PCoasting
& ^) z) h; E7 A: N$ n/ HElectrical Braking 0 R' z/ U5 A' x* ~, V
Mechanical Braking 1 P! K0 W' P" H1 L- ^
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4 m) M# Z$ Y5 ~ q1 n6 f: A4) Motor Operational Control & L3 w S5 L: n% n7 U6 m9 {# N
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Speed Control 6 i' U+ l+ G# X ^
Reversing 5 s1 f8 t K; O. f& x! f
Jogging
( ^0 X6 X8 C# }/ uSequence Control |
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发表于 2009-6-19 21:51
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