Body
If someone reads the RV introduction , "a method to run a motor in hi impedance" , snip ....(using virtual(s) phase(s) ) ..
HI impedance .... as i have told a quantillion times VFD can be amplitude adjusted VOLTAGE CONTROLLED to use say 240 VAC VFDV to drive a 480 VAC wired 3 phase motor .... similar effects to RV but with no significant power factor correction or RE amplification , just the speed tuning to a load .
or reactive tuning....
Direct couplings eliminate belt & pulley friction loss ... VFD controls the speed and low speed motors say 1800RPM or lower are better as VFD can drive them more efficiently at higher frequency from 47 to 450CPS . (Hrz).
(H)
---In [email protected], <mkjekyll@...> wrote :
Hi Sven,
Nice motor!
This is definitely a Hector question as how best to utilize this motor depending on ones budget.
Using another belt to start is a good idea if running in pulse mode. For the prime mover in RV mode beyond the normal single phase and capacitor pseudo-phase I think a multi phase controller one would still use the position sensors such as hall in order to place the pulses properly in relation to the others, or it may not work at all in RV mode with the 3 phase controller without feedback phase sync.
This is a really great Hector question!!!
If it were me to keep it simple I would use a single phase full sine VFD and the capacitor RV trick and play with speeds and duty to return the highest efficiency. Likely wire for 4x the input voltage to match the standard RV impedance ratio. If run in this respect I assume the full sine would be better, another Hector question, since he is the motor guru.
On 12/28/2017 4:13 PM, 'S.friedrich' s.friedrich@... mailto:s.friedrich@... [EVGRAY] wrote:
It is a Siemens 1 FT 3 phase motor from the industry. The 3 phases are led out multifilar. From each phase I have created 6 phases that I can connect to extremely high impedance or too low. I had already thought about the engine via another via V-belt to synchronous speed to bring and then operate as a Rotoverter Primemover or test. Accurate characteristics I would have to look up to 400v Regards Sven
Von Samsung Mobile gesendet
-------- Ursprüngliche Nachricht --------
Von: "Mick mkjekyll@... mailto:mkjekyll@... [EVGRAY]"
Datum:28.12.2017 20:37 (GMT+01:00)
An: [email protected] mailto:[email protected]
Betreff: Re: Aw: Re: Re: AW: Re: AW: Re: Re: [EVGRAY] Capacitive coupling of energy.
Sven,
What size and voltage is your motor?
How did you rewire it?
How many phases is it?
As you know a synchronous motor is most likely to use a VFD sine controller while the BLDC is a pulse controller. I think a synchronous AC can run with an BLDC controller but not as well as the controller is pulsed rather than sine.
We used audio amplifiers and frequency gens to control low paoer single phase synch motors in the past.
On 12/28/2017 1:04 PM, 'Sven Friedrich' s.friedrich@... mailto:s.friedrich@... [EVGRAY] wrote:
Danfoss frequency converter