Empi windshield wiper motor id.

[yankee1919]

Hello All,

Wanted to update windshield wiper motor for the Empi, wanted to know if any one had an idea what type it is?

[yankee1919]

Here are the guts.

Thanks.

Tony

[monomanx]

It looks like a SWF motor. On the bottom picture where the bale comes across to hold the housing on there appears to be the diamond shape SWF logo.
it looks good on the inside!


Does it not work? If it is a SWF, you can change the armature from a 6V to a 12V variety.

[yankee1919]

Thanks for your info.

[EVfun]

Its a 2 speed motor, that is why it has 3 brushes. It is most likely 12 volt already as I don't remember any 6 volt Bugs with 2 speed wipers.
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[monomanx]

EVfun,

Isn't the third brush for park?

[EVfun]

Park is a function of a cam and contacts inside the gearbox section. Basically, the headlight switch only powers the wiper motor during that small amount of time when the wipers and near the bottom. So, when you turn the wiper switch off the wipers continue to be powered until they get near the bottom. Generally (including Bugs) the switch and cam also shorts the motor at the bottom of travel, when the switch if off, because that makes an electric motor stop very fast.

The motor runs fastest with the 2 opposite brushes. The motor is trying to run backward for almost 90 degrees and forward for just over 270 degrees when the other brush is used. That results in the motor running at about 1/2 speed. This technique only works for fractional HP motors or low voltage motors as the fire will fly off the brushes if you try that at serious power levels.
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