Swapping out the motor will be more of a hassle and cost more than just slapping a VFD on it. The Leeson motor mentioned above won t work as it doesn t have the correct mount - Unisaw motors have a specific mount and is different depending on if it s left or right tilt. You may get lucky and find a unisaw specific single phase motor for fairly cheap, but then you will also have to address the overload protection in the starter - finding the correct sized heaters for the new motor as the existing ones will almost certainly be the wrong size.
The motor shown has a FLA of 12A, so you could get by with a 3hp vfd, such as the
TECO L510-203 sensorless vector drive for about $200, or a
FM50-203 V/Hz drive for slightly less. The drive can provide a sustained 10.5A and the motor will rarely, if ever, see FLA. The VFD can also sustain up to 150% rated current for something like 30 seconds if you ever do push it to it s limit. There are lots of people running those VFD s on 5hp machines without any issues (eg: See
this thread at OWWM). And since the starter on the machine will no longer be needed, it can be sold to recover some or all of the cost of the VFD, reducing your overall costs even more.
Cheers,
Brad
- MrUnix