Well I was able to spin it up to 2300 rpm today with a combination of pulleys that I had. No load was 46 volts. Not enough voltage for a 48v bank. Looks like it will probably want at least 2800 rpm to produce the voltage I'm looking for
we are back up and running again!
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Show posts MenuQuote from: keith71 on September 16, 2023, 05:45:00 AMQuote from: RJ on September 13, 2023, 01:48:08 PMWell hiccup number one came to fruition
Rectifier came in a day early, my hasty calculations implied the voltage would be the sum the of the three phases, this isn't correct its the L-L-L mean * 1.35, so in reality spinning at the current speed of ~1250 rpm I'm only getting about 25v DC. Which is interesting because I was told these ran at 1800 RPM. My small motor can't spin the head any faster without billowing some smoke. I have a larger motor but not the correct pulley's for them.
Depending on how your generator is wound, perhaps you need 2 three phase to single phase rectifiers instead of just one. I dont know enough either way just something to look at.. This video is long but if you skip ahead a bit to 27:45 minutes you will see how he wires it. Might be because it is wired 2 in hand as Bob would say.. So there are 6 wires to connect in a regular alternator. 2 wires for each phase.. ??
https://www.youtube.com/watch?v=CL8W5hipaLM
Quote from: Henry W on September 15, 2023, 09:48:27 AMRJ,
When I had that thing running when mounted on the Ford LRG425, I believe it put out around 48 volts unloaded, un-rectified at 1800 rpm's. I can't remember.
If I remember correctly, wasn't there another PM head mounted on the end where the pulley is mounted?
Wow, it's been so long ago. Time sure flies.
Here is a link:
https://www.shawneepower.com/
Eric is the owner. He has the rights to build these. I spoke with him some time ago and he mentioned that they are somewhat different than his. Eric might be able to help you figure it out.
Bob G. has two of those PMG heads also. But, I'm not sure if they are the same as what you have.
Bob and Eric at Shawnee Power would probably be the most help.
Oh, Eric is a member on this forum.
Quote from: Henry W on November 27, 2022, 05:58:37 PMThe engine that powered the Daul unit was a Ford LRG-425 industrial engine.\
It has a continuous rating of 72 hp with LP (propane)
Here are the specs:
Gasoline (corrected per SAE J1995)
Fuel Specification.
.87 A.K.I.
Rated Power @ 3600 RPM ....
.Intermittent: 74 HP (55 kW)
Continuous: 63 HP (47 kW)
Peak Torque @ 1800 RPM.
.Intermittent: 123 Ft. Lbs. (167 Nm)
Continuous: 104 Ft. Lbs. (141 Nm)
Power @ 1800 RPM.
.Intermittent: 42 HP (31 kW)
Continuous: 36 HP (27 kW)
Natural Gas (corrected per SAEJ1995)
Fuel Specification.
.1050 BTU/FT3
Rated Power @ 3600 RPM.
.Intermittent: 74 HP (55 kW)
Continuous: 63 HP (47 kW)
Peak Torque @ 2600 RPM.
.Intermittent: 115 Ft. Lbs. (156 Nm)
Continuous: 98 Ft. Lbs. (133 Nm)
Power @ 1800 RPM.
.Intermittent: 39 HP (29 kW)
Continuous: 33 HP (25 kW)
Liquefied Petroleum Gas (corrected per sae J 1995)
Fuel Specification.
.HD-5
Rated Power @ 3600 RPM.
.Intermittent: 84 HP (62 kW)
Continuous: 72 HP (54 kW)
Peak Torque @ 1800 RPM.
.Intermittent: 133 Ft. Lbs. (180 Nm)
Continuous: 113 Ft. Lbs. (153 Nm)
Power @ 1800 RPM.
.Intermittent: 45 HP (34 kW)
Continuous: 38 HP (28 kW)
Quote from: Tom Reed on September 13, 2023, 02:57:42 PMThat sounds like a good plan. My 6/1 puts out a steady 3 kw with brief loads of 3.6 kw when the microwave is on. I just went and checked to see what's available these days for PM 48v generators and there is quite a bit to choose from and some are dirt cheap! https://www.amazon.com/Alternator-Gearless-Permanent-Insulation-Horizontal/dp/B0BG47RMGV/ref=d_m_crc_dp_lf_d_t1_sccl_2_2/139-6785606-9829854?content-id=amzn1.sym.5d471845-5073-424b-b27b-c0676f48a016&pd_rd_i=B0BG47RMGV&psc=1
Quote from: Tom Reed on September 12, 2023, 08:20:16 PMThat might not be enough engine. The general rule is 2hp per KW. 200 x 48 = 9600w or almost 10 KW or 20hp. Do you have a way to limit the current?
Quote from: veggie on December 01, 2022, 09:27:14 AMRJ
That alternator is a total BEAST. I love it.
I can only imagine the cost
Nice find.
veggie
Quote from: Tom Reed on November 29, 2022, 11:10:16 AMThanks for resurrecting a great thread RJ, I have a CS6/1 and a spare MX60 and would really like to get rid of the ST5 generator head I'm using now. I really like the idea of an axial generator for simplicity and reliability. The wind generators on the linked site seem to max out around 30 RPM and we need something around 650 RPM.