Both these decks use shaded pole motors which are a form of asynchronous induction motor. Like all such, some of the power supplied is used to induce the magnetic field in the rotor.
The rotor field is induced by relative motion (slippage) between the rotor speed and the stator field speed. The stator field is synchronous with supply, so the motor must run at a lesser speed.
The greater the load on the motor the greater the slippage. The lower the voltage supplied, the greater the slip for a given load.
Altogether this means the motor speed depends on the supply frequency, the voltage and the load.
Exactly where in this continuum you end up is a matter of taste. For a long time I used 53Hz, 110 V and the brake fully on (mine is a 50Hz pulley) but I'm now playing with other parameters not available on a normal power supply so that will change.
Mark Kelly
The rotor field is induced by relative motion (slippage) between the rotor speed and the stator field speed. The stator field is synchronous with supply, so the motor must run at a lesser speed.
The greater the load on the motor the greater the slippage. The lower the voltage supplied, the greater the slip for a given load.
Altogether this means the motor speed depends on the supply frequency, the voltage and the load.
Exactly where in this continuum you end up is a matter of taste. For a long time I used 53Hz, 110 V and the brake fully on (mine is a 50Hz pulley) but I'm now playing with other parameters not available on a normal power supply so that will change.
Mark Kelly