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ELECTRIC MOTOR CONTROLS V$ P8 b3 z$ A* R2 B) h& i% T
F- s& K. _2 Q8 k: ]1 hOnce the proper motor is selected, understanding the many various control devices available and * C+ O& `7 }5 h$ r3 L
their uses and limitations becomes an important part related to reliable operation and protection of
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Motor Control Topics
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9 I( |0 a7 \: y ?7 wThere are four major motor control topics or categories to consider. Each of these has several * s i! Q8 e% C1 f3 o7 ~7 U0 a
subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor + m' i) [5 G! ] S3 N% f9 [- X
control equipment can accomplish multiple functions from each of the topics or categories. 0 d; C3 P/ H! r2 a
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The four categories include:
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9 O# E7 @$ e) R9 E& y4 G1) Starting the Motor
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4 W d. [% t$ C7 M( C- a! UDisconnecting Means
4 e( t: f7 E9 D! GAcross the Line Starting
$ f' M8 x h2 Y) B! R* S) g! J7 cReduced Voltage Starting . J" _# E, i' b, J$ ]- \
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1 E' q& e% r* Q K' v" A2) Motor Protection
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# B* u# J2 Q( E0 p" f" T6 gOvercurrent Protection 7 R4 d e( l; I- x( F% \6 L# \
Overload Protection
. j; H& e3 i3 [8 K# y% POther Protection (voltage, phase, etc)
0 X. N) ?# c1 Y6 BEnvironment " v C9 n2 f; D; m) \6 X( T) B
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3) Stopping the Motor
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4 ~, b5 E/ a' E/ ~; l" fCoasting 4 M. j4 a( J7 ?5 Q4 ?
Electrical Braking 9 \# ]1 u$ g$ h/ p4 }
Mechanical Braking
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4) Motor Operational Control # X. f; T5 x& o, b, o
3 p+ ^, o( I6 s+ V2 F USpeed Control
' I2 r1 j9 z/ ^/ l- g t5 JReversing
9 G$ j' g8 E& G2 y; aJogging
# s8 |# ^( q7 S" wSequence Control |
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发表于 2009-6-19 21:51
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