You can normally get a single phase rewound to three phase by a competent rewinder. You get more power but maybe more important you get better motor cooling. A low end VFD/ 3 phase motor installation can benefit from keeping the rotor speed up. Running a back gear or additional speed reduction can really help at the low end especially if your setup isn’t ideal. Without too much effort you can get good results however if you have a back ear option don’t give up on it.
Also it doesn’t hurt to up rate the motor horsepower maybe as much as 3X the current motor to help with that low end torque. Topped out depends upon the max recommended motor rotor speed and the VFD’s capability. However you need to consider if you will have suitable spindle speed when the motor is topped out.
The larger the ratio (speed reduction) The better the low end performance. You then need to figure out the best belt ratio for the motors ideal operating range. Second you need some understanding as to what the ideal speed range will be for this lathe ideally you will work with a 4 pole motor when figuring this all out.
GOODWAY LATHE CLONE UPGRADE
First upgrade the VFD to one affording vector control. One mechanical solution is to go with a Reeves Drive.Ī second option is a DC drive / motor combination.Ī third option is to consider a 3 phase motor with a VFD drive.Ĭonsidering the 3 phase motor and VFD, this is one of the better options but getting the best results requires a bit of thought. There are lots of options if you want to consider them. I am currently restoring a BV-20 lathe and thinking of putting a VFD on it. PS The supply voltage (110Vac) should not be an issue if the motor size not over 1hp. I can adjust the spindle speed from 120 to 1200 rpm without touching gears or pulleys. I have an Optimum TU2506V, (V: read VFD) which has this setup and find it excellent. VFDs are used on most modern small lathes. There are two types electronic only (no moving parts) and rotary converters (1P motor drives 3P generator) which are used for higher horsepower industrial type lathes. If you have a lathe with a Three Phase Motor but no 3P supply then you can use a device called an Inverter to create the 3P to run the motor. Versions for Single Phase or Three Phase supply are available. An electronic motor controller that creates a variable AC power frequency allowing the user to control the motor speed. However, for lathes, the best solution I think is a device called a Variable Frequency Drive. There several different belt and pulley types. G'day Shopgeezer, If you really want to do the adjustable pulley thing, I would have a look at Google and search for Continuously Variable Transmissions (CVTs).
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