Answer / akky

Sometimes called "electrical center," it's the axial
position that the shaft/rotor assembly will attempt to
maintain during steady-state running at rated voltage and
frequency, without the influence of any coupled load.

In the usual ball- or roller-bearing machine, the shaft
position is fixed by the bearing mounting. But in sleeve
bearing motors, the bearing construction inherently permits
mechanical movement or "float" (typically 1A" or 2",
depending upon motor size). Low sliding friction allows the
shaft to drift readily back and forth to seek whatever
position is dictated by the axial forces acting on the
rotor.

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I just purchased a 4 position cam switch to be used to operate a 3-speed blower motor. The motor is a 10 amp motor and has 3 wires that are used to control speed. The cam switch was rated at 660V 20 amps but when I received it, I noticed that it has AC-15 operational current rating (Ie) of 4/5 amps. If I am reading the label correctly. the 4/5 amps is related to 440v/220V (Ue). Other ratings are AC-3: 5.5A, AC2: 7.5A and AC-4: 1.5A. My questions are 1) Is it safe to use this switch with the motor I have 2) what is the difference between the 20 amp Ith ratting and the Ie operational ratings?

1 Answers  

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