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ELECTRIC MOTOR CONTROLS + [3 m9 q$ ^- d6 }& K5 k8 `
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Once the proper motor is selected, understanding the many various control devices available and $ E9 @/ u( c9 @: e; {, o) f
their uses and limitations becomes an important part related to reliable operation and protection of M8 B/ h# o7 D% j8 R
the motor and the personnel using the motor.
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Motor Control Topics 9 V! Q$ _ z' X8 I- d
, b) D2 w/ O Q: l+ l8 S2 |There are four major motor control topics or categories to consider. Each of these has several
/ p! q+ @; d6 ?4 k X0 hsubcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor 3 F$ [* f+ v ~: i4 {8 O$ Z7 p
control equipment can accomplish multiple functions from each of the topics or categories.
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The four categories include:
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' J& P0 k" }# A& R9 _1 h1) Starting the Motor
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+ J" c8 ~% S0 R( |: _Disconnecting Means
, n$ M) a; r5 s0 K1 Z) [Across the Line Starting
1 Y7 @5 S& |; q5 v+ w. B* K: vReduced Voltage Starting
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2) Motor Protection
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Overcurrent Protection 7 {0 l4 F7 I5 F& t
Overload Protection ( } A b' y& O$ T' ]
Other Protection (voltage, phase, etc) # s" f. U2 k. | b' h6 @* v9 P0 {
Environment
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3) Stopping the Motor 7 |5 ^+ l' m6 X( F2 c* d
+ _5 |2 [) V' |- r) ^) i) {. X" iCoasting
) p& E" q4 T6 N- l. IElectrical Braking 8 V% T$ Q( W4 F! K& U6 X2 r/ q, |1 p
Mechanical Braking
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3 H) M/ B" T2 t |' O' n t8 g% j1 @! Q4) Motor Operational Control
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Speed Control ! Y6 U7 k* c* _$ B' Z+ ]2 u
Reversing # |% u+ T/ ^ O7 J- K, Z4 _
Jogging & k( L F; O% V% Z M5 t% T
Sequence Control |
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发表于 2009-6-19 21:51
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