- Dec 10, 2016
- Reaction score
What is a BCA machine?
Many people use a VFD to get a slower spindle speed without changing the gearing. Using a lower gear actually magnifies the available torque, but if the VFD is used in the expectation that it would behave in the same way as gearing, then it appears that the slower motor has reduced torque because it isn't magnified by the lower gear..It's been my experience that torque drops with lower rpms on a vfd. At least this is true with the 2.2kw 24000rpm motor on my router and the 3600rpm motor on my mill. Both are 3 phase, the former is 400hz and the later is 50hz.
It depends on what noise you wish to reduce. Constant fan hum can be a bit distracting and is unnecessary when the VFD is not driving a motor or is under very light load. The fan is for cooling so ambient air temperature must be taken into account when looking at modifying fan operation.What solution DC or VFD is most pleasant noise-wise?
Hello KenI have found most single phase motors can be rewound to 3 phase and the number of active poles can be changed as well - just find a competent rewinder.
Further you can use a VFD to run the beans out of the motor - typically generating many multiples of the horsepower.
I do this all the time in my line of work (robotics) where I need much more power to weight ratios than are typically available from standard 1500 / 3000 rpm configuration squirrel cage motors.
(See attached article)
Most motors can be spun up to 3000 - 12000 rpm for commensurate winds and appropriate consideration to bearings. balance, cooling and other issues.
Most persons are going to chime in and tell you why not - but I am talking from real world practical application here.