you're better off getting a whole new motor. voltage is easier to adjust than the frequency, which as noted above will affect playing speed, which is sort of a big deal when you're talking about a turntable. depending on the TT you're talking about there might be ways to mechanically adjust the motor or deck to deal with the 50hz/60hz difference.
Voltage converter for using 220V turntable in US?
Have you used 220Volt turntable with voltage down converter (220V to 110V)? Which converter have you used?
I wonder whether a cheap voltage converter may damage the turntable motor for irregular voltage level.
I wonder whether a cheap voltage converter may damage the turntable motor for irregular voltage level.