Rotory pump and motors seem awfully big for the required water volume and torque to make 140 psi. Just out of curiousity. What is the smallest motor/rotary pump combo being used today? (Or are they all pretty much the same.)

not sure which is the smallest.. but I haven't seen a smaller rotary pump than the RPM in the middle..

The smallest rotary pump I have seen:
http://cgi.ebay.com/ws/eBayISAPI.dll?Vi ... 0322325427


Plus w/adjustable motor speed; seems a really good fit for espresso machines

HEY! Now that's cool

Has anyone tried installing one of these yet?

lordfreddy wrote:The smallest rotary pump I have seen...

It sure looks cool... but that particular motor is 200V, 3-phase.
Have you been able to find this motor in 110V single phase (or 220V single phase)?

Hi guys,

I believe it's being run from the controller which is single phase but is able to power the 3-phase motor, as most VFD controllers do. The problem with simply going out, buying a VFD and sticking it to your existing pump motor is that they usually don't work with single phase motors with start capacitors.

I've noticed you can order an analogue board for it and run it through a 0-5V input (PWM or some other method). One thing I don't get though is how the speed affects the pressure, wouldn't that only slow down the pressure ramp up on the group? I mean if there's resistance pressure is going to raise anyway, or am I missing something?

Regards,
dsc.

http://www.fluidotech.com/Pages/en_fo_fa_30_200_literature.aspx
open PDF file: TMFR 0109 Ed.pdf
for dimensions and other specs.

Regards
Peter

One thing I don't get though is how the speed affects the pressure . . .

The TMFR, like all rotary vane pumps, is a positive displacement pump wherein flow is generally proportional to speed. The pressure in the system, as a result of this flow, is proportional to the square of the flow.

Greg S. has done an admirable job in applying this pump system in a commercial setting and that is a vast understatement - http://www.home-barista.com/espresso-ma ... 11113.html

However, keep in mind that this pump system is not YET ready for the home environment. The drive takes in 115-120 Vac and outputs ~ 90 Vac, 3-phase, variable frequency (30-120 Hz) to the pump/motor. The drive is (must be?) equipped with a filter card to meet UL requirements and this filter card is inherently not the "best of friends" with a GFI circuit in today's kitchens.

Other AC drives, more user friendly, are available on the market today - as an EXAMPLE - http://web4.automationdirect.com/adc/Ov ... 3947184022. Whether any of these other drives can be applied to the TMFR motor/pump is, at least, questionable. In addition to the link that Peter supplied for the Fluid-O-Tech site in Italy, the USA site has more info on the TMFR series: http://www.fluid-o-tech.com/

erics wrote:The drive is (must be?) equipped with a filter card to meet UL requirements and this filter card is inherently not the "best of friends" with a GFI circuit in today's kitchens.

If I understand GFI correctly and translate the Dutch name for it into English words, then it would be called "earth leak switch" - standard in our houses for decades.
I do not understand the "filter card", what does it do?

As to size, I think the TMFR motor/pump is pretty small and the attraction is it has no moving parts other than the pump. The "motor" magnetically pushes the magnet in the pump around without rotating an axle. No coupling, no additional vibes.
The control box is a bit smaller than the motor/pump. What about other motors that are used in espresso machines - do they all require some control/drive unit? What is the rationale here?

Regards
Peter

A few years ago I was looking for a motor/pump as compact as possible and back then stumbled on several models by Procon.
I recorded some data on the MagDrive Series 2 & 3, 5, 6 and Canned Motor Pump (CMP) 7000, all quoted as suited for espresso machine usage. [http://www.proconpumps.com]
IIRC these were significantly smaller than a motor/coupling/pump package.

Regards
Peter