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ELECTRIC MOTOR CONTROLS 1 q O3 ?' g4 \% ^
* a9 R0 ` Z1 e, MOnce the proper motor is selected, understanding the many various control devices available and # b& W- E6 y$ C1 X, W
their uses and limitations becomes an important part related to reliable operation and protection of . [" T2 e2 _; {2 @% s& r! ?2 `9 e
the motor and the personnel using the motor. 8 w9 f$ ?% Y% B! N
/ p+ e. ^6 K. s* eMotor Control Topics
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' U, Y' V( Q3 JThere are four major motor control topics or categories to consider. Each of these has several + [9 h2 T4 h* B: P8 l
subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor
4 P) F1 J4 O& h, q% |/ e2 h+ Ucontrol equipment can accomplish multiple functions from each of the topics or categories.
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The four categories include:
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1) Starting the Motor
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Disconnecting Means
1 h. V' e1 j9 n3 E" D$ yAcross the Line Starting
* D% T5 }2 v1 G' u3 Q9 c( uReduced Voltage Starting
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( U B, H& M# h% [% V2 E U2) Motor Protection
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Overcurrent Protection ! [1 ^0 V5 M1 @' R
Overload Protection " }" x, s6 g) Y% \- P* p' l; a. J
Other Protection (voltage, phase, etc)
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3) Stopping the Motor 1 k. E" c7 S. x$ e
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Coasting
) W1 q: q$ K; y6 u. i, A# y6 zElectrical Braking # C$ V9 t* i- H& V+ Z
Mechanical Braking
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4) Motor Operational Control / T! M9 C+ |# c: I+ j/ j
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Speed Control
( l( n, F$ _ a8 l( }3 @7 S* vReversing / H7 z. U: S# _( D! ]& `9 C
Jogging # N d4 p4 m5 g8 X: r
Sequence Control |
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