- Pulley ratios / diameters for belt drive conversion?
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Pulley ratios / diameters for belt drive conversion?
Can anyone help me out with recommended pulley ratios for a belt drive conversion?I'm looking at buying a 2 pole 3 phase 2800rpm motor (50Hz in Aus) and a VFD (vectorless is apparently the way to go). I am just not sure on what ratios to use, when you take into account milling requirements, torque curves, and the effect of the VFD. I've even heard you can overspeed the motor with a VFD.Thanks.
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Re: Pulley ratios / diameters for belt drive conversion?
Thanks is it better to get a 4 pole or 2 pole motor? I have seen people using 4 pole at like 100Hz+ but wouldnt it be better to go 2 pole and run at lower Hz?
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Re: Pulley ratios / diameters for belt drive conversion?
I'm no expert on the subject but my take is that you'll probably have more torque / hp than needed at the higher RPM's (because you'll be running a small cutter) and less torque / hp than desired at the low RPM's. That means in my mind you would want a 4 pole (1500 / 1750 rpm) motor as it has its full rated torque at that rpm where as a 2 pole motor will be half as much toque at the same RPM. The VFD is electronics and couldn't care less what frequency its output is as long as its within the specs of the unit. The only caveat is to get an "inverter duty" motor. As I understand it operating the motor below its design rpm can result in increased heating so an inverter duty motor has better temperature rating on its windings.
- Pulley ratios / diameters for belt drive conversion?
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