 鲜花( 30)  鸡蛋( 0)
|
ELECTRIC MOTOR CONTROLS 1 t5 f* L$ p0 Q1 D7 q
( l# J j! |( {3 K1 mOnce the proper motor is selected, understanding the many various control devices available and
7 f4 Y- e6 T4 j" {5 Ntheir uses and limitations becomes an important part related to reliable operation and protection of , O0 t# m! y( M
the motor and the personnel using the motor. % r- e0 T! w; T* j+ L% v4 r
8 l$ E7 Z1 l& s3 I
Motor Control Topics
2 M0 N" X1 ~4 N, T, I. o# J, V6 i% @. |5 K) L# C. y
There are four major motor control topics or categories to consider. Each of these has several 1 o' d& t9 _' H9 \" \! {! x- I
subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor
# @* ]5 q* c/ E; c6 V4 C$ scontrol equipment can accomplish multiple functions from each of the topics or categories. % B2 R# B* {" b5 a5 w: h" n
; n/ x3 m" F' X6 y9 z. c, rThe four categories include:
; k4 o/ d; Z) I1 m4 s: p( z! ?
3 D5 n- s4 }, u( l @( G$ Q) @1) Starting the Motor 9 `6 i0 ?- e3 }3 T: l
. V2 U# v- U1 UDisconnecting Means 8 [ R3 ^8 E2 g+ {% f" j! i" q7 H& k
Across the Line Starting ! V2 P/ c5 g! o' v" U) \1 O& k
Reduced Voltage Starting
6 H! @/ k$ I0 d. C5 J# J: b: l' }5 i2 Q; Y* s2 m. ]
/ F' D5 |, \% h5 t# P Q9 i2) Motor Protection
& C5 C4 |) u& _! a8 Q a/ l7 V: H5 b- c2 J4 f( j3 T
Overcurrent Protection
& v" J G8 r w gOverload Protection
1 |* L1 Z' O+ N7 q" N. \4 ?6 NOther Protection (voltage, phase, etc)
9 u( \2 p) F" L3 hEnvironment - S* r) z' a) E2 t0 f
6 Z3 B3 _6 ?/ |7 C" ?5 ^
% C" L# Z$ q( N+ n; O3) Stopping the Motor 5 q. S3 a. A: Z; H
5 \. N8 v: N4 r! t' C
Coasting
6 s1 l! W6 V! i, p) wElectrical Braking 5 j$ s; P3 t7 { N( z0 p4 y A
Mechanical Braking
5 b5 B f# k& E6 ^4 L( m$ R3 c9 E
! t$ M- z. P: S) \1 K8 U1 t* v6 _- c h% h( f& y- ^/ U
4) Motor Operational Control
* K2 _; \* Z& W: e% Y. z0 q" N8 `" k+ L9 n4 t
Speed Control $ t" M5 p, p" ~6 `: l
Reversing . A, o3 H6 A$ E$ t7 D+ L* Q
Jogging
1 `6 t- D/ r" s1 q" V3 \, FSequence Control |
|