You're asking a lot of a motor to double your speed with a VFD. Put a bigger pulley on. I think you'll find new motors of TEC and the like will do %200 but with a duty cycle.Top speed is 750rpm but the idea was to use the inverter to double it. I'll see how I get on with the original, I can always up the motor spec later if needed.
You're asking a lot of a motor to double your speed with a VFD. Put a bigger pulley on. I think you'll find new motors of TEC and the like will do %200 but with a duty cycle.
Top speed is 750rpm but the idea was to use the inverter to double it. I'll see how I get on with the original, I can always up the motor spec later if needed.
25 turns of the input pulley should be 24 turns of the spindle
Generally the slower the speed the lower the motor rating. Schools, training etc had smaller motors and while I've no idea of the speeds/HP for the 140 there is some info on the L5I would ask the question” Why was the 2 HP motor fitted to the 1400rpm machines?” The 1.5HP motor might struggle, particularly starting at maximum speed (especially when cold or with a large workpiece)? I don’t know the answer - but if you have plenty of choices, I expect you will work it out.
Only 4% difference to 1:1, so fairly insignificant in the choice of rpms or pulley size selection?
Don't forget the dual speed motors. 2000rpm top speedGenerally the slower the speed the lower the motor rating. Schools, training etc had smaller motors and while I've no idea of the speeds/HP for the 140 there is some info on the L5
31 to 720 rpm - 1.5 hp 1500 rpm motor
42 to 960 rpm - 2 hp 1500 rpm motor
62 to 1440 rpm - alternative range with the 2 hp 1500 rpm motor
31 to 1400 rpm - 16 speeds: two-speed 1.5/3 hp 1500/3000 rpm motor
62 to 1400 rpm - 16 speeds: alternative range with two-speed 1.5/3 hp 1500/3000 rpm motor
22 to 500 rpm - 1 hp motor
34 to 750 rpm - 1.5 hp motor
45 to 1000 rpm - 16 speeds: 2-speed 1.5/3 hp 1500/3000 rpm motor[1]
34 to 1500 rpm - 16 speeds: alternative range with 2-speed 1.5/3 hp 1.5/3 hp 1500/3000 rpm motor
So in general 500rpm - 1HP, ~750rpm - 1.5HP, ~1000rpm - 2HP, ~1500rpm - 3HP.
When I came to replace mine I went with the spec of the largest original motor (ie 2.2Kw/3HP) on the basis that with a VFD it was trivial to change the speeds.
I'm reasonably sure the 140 would be perfectly fine for 2000rpm with a suitable motor and that's where I'd be aiming for personally.
[1] I'm sure this is wrong. I suspect it's actually 45 to 2000rpm (or 22 to 1000rpm).
Yes. More just to verify my assumption on the gearing was correct!