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Stepper motor used for rotating beacon warning light?

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treez said:
I understand a bipolar stepper has two coils only
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No, it has two phases. Each of those phases is composed of multiple coils wired in series. Each coil is wound around a pole. The number of poles determines the number of steps per revolution. Although it is possible to make a stepper motor with only one full step per revolution, you don't get very much torque that way.
 
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treez said:
Thanks, though with the beacon possibly being on for 20 hours per day, every day, won't the brushed dc suffer too
much wear of the brushes?
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This brings to mind the geared motors that are in old-fashioned clocks. Millions installed. Low power. Not too large. 24/7 continuous use. Lifetime measured in decades.

It's an AC motor, so it has no brushes.

8750734600_1405291702.png


A similar motor might be in disco-ball spinners.

The gears bring rotation down to 1 rpm. The video looks as though the beacon rotates about 60 rpm. It might not be easy to get a gearbox that does this.

Moreover you would need to chop a DC supply into AC.
 
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Stepper motors are usually manufactured with more precision
in mind, than a simple universal or PM brushed motor. The
application does not value precision, only durability and cost.
A stepper motor incurs the added cost of a driver board, to
no real benefit.
 
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As beacons are used in warning purpose, so reliability is more important than durability. The link from post #23 also explained about reliability. To get better reliable operation, extra cost of driver board sometimes may be tolerable.
 

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