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Motor Starting Methods

Type Of Motor
Scheme
Starting Current (%FLC)
Starting Torque
(%FLT)
Remarks
Squirrel Cage
Direct-on-line
500/600
100/120
High starting current
Quick start, high torque
Star Delta
170/200
30/40
Fixed Torque. Light starting with reduced motor current.
Requires 6 terminal motor.

Auto Transformer
50% Tapping
65% Tapping
80% Tapping


125/150
210/250
320/380

25/30
42/50
64/77
Reduced starting current.
Tappings selected to suite load & torque.
Smooth starting.
Soft Start
Variable
Variable
Reduced starting current.
Smooth controlled run up.
eliminates mechanical shock loads. Reduced maintenance.
Can save energy.
Slip Ring
Stator Rotor
Depending on resistance grading and number of steps these figures may have values from 50% to 250%
Smooth starting with high toque available for acceleration and low starting current
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