Change motor speed for vacuum control?
Change motor speed for vacuum control?
(OP)
I have a project to improve the control of a vacuum tank in my process. Currently I have a proportional valve that opens and closes based on vacuum setpoint. My question is can I change the speed of the vacuum pump and get the same or better results? I have 3 phase 460V motor.





RE: Change motor speed for vacuum control?
"Venditori de oleum-vipera non vigere excordis populi"
RE: Change motor speed for vacuum control?
1. VFD; however, it needs a inverter type duty aligned with the pump
2. Motor input voltage regulator, e.g. autotransformer/variac
3. Electromagnetic coupling, e.g. MagnaDrive (if the motor-pump alignment permits it)
However, it is better to consult the equipment tech support to have it approved
RE: Change motor speed for vacuum control?
My experiance with the valve approach is poor control. Basically ends up with an off/on effect. Meaning that I could get a little change on the high end, but could not control very well on the low side. My guess is that a pump control would provide better control at both ends, but I have never had the need for that much control.
Might be worth a call to a rep for you application. Filter though the sales pitch and review thier literature.
RE: Change motor speed for vacuum control?
RE: Change motor speed for vacuum control?
rmw
RE: Change motor speed for vacuum control?
http://www.andantex.com/speedcon.html
RE: Change motor speed for vacuum control?
One major pitfall to be aware of though is lubrication of the vacuum pump. Check with the manufacturer to assure that lubrication is not speed dependent. If it is you may need to consider upgrading to a separately powered lube system for it.
"Venditori de oleum-vipera non vigere excordis populi"
RE: Change motor speed for vacuum control?
Yasundo Takahashi (died in 1996), Michael J. Rabins, David M. Auslander "Control and Dynamic Systems," Addison-Wesley Publishing Company, 1972