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Starting Characteristics of Squirrel Cage Induction Motors

Starting Method

Voltage
at Motor
Line
Current
Motor
Torque
Full-Voltage Value100100100
Autotransformer

80% tap
65% tap
50% tap
80
65
50
64*
42*
25*
64
42
25
Primary Resistor Typical Rating808064
Primary Reactor

80% tap
65% tap
50% tap
80
65
50
80
65
50
64
42
25
Series-Parallel1002525
WYE-DELTA1003333
Part-Winding (� – �)

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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