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Using two same RPM shaded pole motors, one with a one inch diameter motor and one with a two inch diameter. Using a DTDP switch to swap power from one pulley to the other. For a two speed rotation device.
Yes, this is the principle of the two speed Leslie speaker as used with electric organs from the 1950's. two motors mounted on one shaft, two pulleys. select speed by turning one motor off and the other on.