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ELECTRIC MOTOR CONTROLS + e' ~" Y3 B" _1 |% r
1 m; ~: ?1 I( u! R5 O" X6 ROnce the proper motor is selected, understanding the many various control devices available and 1 R, t& ?/ H, i+ J) Z
their uses and limitations becomes an important part related to reliable operation and protection of
0 p2 @) }; u# r" c; p* p7 h4 M! dthe motor and the personnel using the motor. : N: f2 A5 `' J" H* e& h5 r6 N
7 M9 @8 Q6 L/ Y2 aMotor Control Topics 1 \# Q* K+ i* m. x, S0 g5 K
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There are four major motor control topics or categories to consider. Each of these has several
1 X4 }! G3 B; o. isubcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor
+ ~( h8 W+ `# t) V$ u: H. P+ Acontrol equipment can accomplish multiple functions from each of the topics or categories.
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$ U$ {& Q* s5 R( A. z* GThe four categories include: ) d9 M1 y0 f- l
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1) Starting the Motor
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% h" k3 \9 H ^/ t! {Disconnecting Means
) ^% u0 r, v: Z# }. V3 P E4 [1 XAcross the Line Starting ) U1 S; T' U( |( T$ u$ S
Reduced Voltage Starting " w {& N: y0 l1 b# s$ [+ \
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# \9 z" V' R' e2) Motor Protection
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! s4 W3 j6 ^% w* c7 i8 k$ U9 QOvercurrent Protection
j$ w0 m3 }, z2 COverload Protection 8 Z: Y6 g3 H% v# ^1 o+ ?/ O9 W' R% b
Other Protection (voltage, phase, etc) 8 ~+ |! i. o% r! R: N( x/ K! _
Environment ) @* G W1 j: `2 c1 M9 X2 o; ?0 d) S
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2 F* m) u \1 u/ G0 V3) Stopping the Motor 6 h* e% w3 _5 J: e% d# z
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Coasting / \7 J5 k. y. V, [
Electrical Braking * R, Y) W3 D l" _% S( C/ A
Mechanical Braking " Q7 j/ a) G4 t9 A% `/ a
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4) Motor Operational Control " q* p$ @6 j1 }
B# ?) }2 s6 Z+ GSpeed Control
8 N5 d! L/ K! s* }7 D' cReversing
% m e, j1 j; N, FJogging
) I% m( W! i" K/ U0 i XSequence Control |
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发表于 2009-6-19 21:51
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