All the plots and analysis are here. Not much more to say than what is in the summary – it is a shaded pole motor that of its time was well thought out and executed however, it is little surprise that to improve for audiophile use, large amounts of mass have to be added to the plinth and platter in order to overcome the inherent limitations. Also note there is a fair amount of energy in the Z axis centred around 430Hz which is reduced by operating at 180V series connected / 95V parallel. This reduced operating point will reduce torque by about 10%.
240V mains
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220V Clean Supply
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240/220V Speed Variation
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110V Step Down Transformer
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110V Clean Supply
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95V Clean Supply
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One to show reduction in vibration by touching the motor to the frame, but this will give no speed variation improvement!
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110V Speed Variation
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Finally a plot from the current rig to compare with the original Lenco motor tests that were shared on Lenco Heaven in 2014. A different FFT window was used that produces a sharper illustration but the amplitudes are the same, less bandwidth which misses the 500Hz energy band and the accelerometer was mounted further from the axis of rotation which results in larger measured accelerations. That said, they are similar.
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