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ELECTRIC MOTOR CONTROLS ; f7 N, v0 g K
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Once the proper motor is selected, understanding the many various control devices available and " _; [ ^/ O9 H8 U, P4 }
their uses and limitations becomes an important part related to reliable operation and protection of
( V' r$ V' e/ K+ J2 I/ `9 S; mthe motor and the personnel using the motor.
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Motor Control Topics 0 X1 G, Q8 J- S3 r
, x, o0 [; t* VThere are four major motor control topics or categories to consider. Each of these has several
$ A! h6 E2 k& [& n' Msubcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor
# \: M7 L" B/ t; m5 E: z1 Dcontrol equipment can accomplish multiple functions from each of the topics or categories.
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The four categories include: % x6 y6 L& ?$ e {3 G0 ~# i, M
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1) Starting the Motor
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Disconnecting Means : q, A9 A3 g& X( e6 U9 B& A
Across the Line Starting . a$ G3 a2 H. X$ H3 N# K
Reduced Voltage Starting
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2) Motor Protection
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5 t5 Z8 b9 s8 S8 jOvercurrent Protection
& v: J8 l9 S0 a7 [2 _ QOverload Protection
# u: z5 F& O0 J: E9 f0 {, z, q9 kOther Protection (voltage, phase, etc)
0 m6 B5 Z/ {5 U3 E3 K7 LEnvironment
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. D9 C0 L! Y* \" |+ l/ ^. W. p6 l3) Stopping the Motor + B! \5 V5 E, K
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Coasting , x- T5 u* x5 k) Q/ [
Electrical Braking
, w4 J& x, a% S+ H; O- WMechanical Braking 0 ~$ g/ Q: M) R8 m
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2 T7 K1 | J9 J4) Motor Operational Control 2 O/ p" J/ }3 a2 Y
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Speed Control 8 v9 a; Z- N! k2 X+ I2 ^
Reversing
/ Z: ^4 J) S" G4 L$ bJogging & ^- O3 J1 ~% \. ]5 R; H0 r
Sequence Control |
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发表于 2009-6-19 21:51
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