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Starting Characteristics of Squirrel Cage Induction Motors

Starting Method

Voltage
at Motor
Line
Current
Motor
Torque
Full-Voltage Value 100 100 100
Autotransformer
80% tap
65% tap
50% tap

80
65
50

64*
42*
25*

64
42
25
Primary Resistor Typical Rating 80 80 64
Primary Reactor
80% tap
65% tap
50% tap

80
65
50

80
65
50

64
42
25
Series-Parallel 100 25 25
WYE-DELTA 100 33 33
Part-Winding (½ - ½)
2 to 12 Poles
14 and more Poles

100
100

70
50

50
50

Soft start is also available using solid-state controls.

Consult manufacturer for voltage, current and torque rating.

*Autotransformer magnetizing current not included. Magnetizing current is usually less than 25 percent of motor full-load current.

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Joliet Technologies, L.L.C.
Toll Free (866) 492-9888
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