Anatomy of the Hurst motors

Anatomy of the Hurst motors

Postby vienna acoustics » Sat May 23, 2020 1:54 pm

Since I have two 115 volts 60 Hz Hurst Motors which are useless in Europe (230 VAC 50 Hz), I decided to dismantle one of them and show here the photos. I am sure that everyone here would like to see how they are made of as well as the internal components.

A hurst motor doesn’t require any tool to be dismantled other than an Allen key to remove the collar brass which is the component which retains the rotor in the rotation sleeve and balanced.

I had removed fairly easy the bottom cap (the part with the sticker)

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The bottom’s removal reveals the bottom part of the rotor magnet and the lower stator

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Then by removing the brass collar, the rotor is free to be removed.

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In the rotation sleeve there is thick grease .
!
vienna acoustics
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Re: Anatomy of the Hurst motors

Postby vienna acoustics » Sat May 23, 2020 1:57 pm

Next the two stators with the windings were removed by tapping them

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I guess due to the transportation and the shocks occurred, the rotor was a bit loose as well as the stators.
It’s pretty obvious from the above photos that the Motor’s lubrication should be done with a needle below the retainer brass collar. The Brass collar is rotating against two washers thus any audible noise is coming from this point or from a loose shaft’s friction against the sleeve.

If this bronze collar is not firmly attached to the shaft then rotational vibration will occur. Too much pressure will cause audible noise.
!
vienna acoustics
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Posts: 413
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