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Messages - jzeeff

Pages: [1] 2 3 ... 15
1
Generators / Re: Single to 3 phase converter
« on: January 15, 2010, 02:48:36 AM »
I second that - just buy a VFD and pick up variable speed too.

2
Everything else / Re: New engine controller
« on: October 18, 2009, 05:39:57 PM »

If anyone wants some Arduino programming done, let me know.  I used to program engine controllers for Ford.  Temp, rpm, pressure, volts, CO gas, throttle position, air flow, etc are possible.




3
Generators / Re: One engine two alternators.
« on: September 30, 2009, 02:20:25 AM »

What happens when you try to run the battery charger off of the generator?

4
General Discussion / Re: Cool tuning tool for SI engines
« on: September 27, 2009, 02:23:23 AM »

Haven't tried it, but I suspect that I would prefer a wideband O2 sensor.

5
General Discussion / Re: my apologies for the time down
« on: September 26, 2009, 02:08:59 PM »

I'm willing to start a collection for some better hosting.  Or help with moving the site.

6
Generators / Re: One engine two alternators.
« on: September 16, 2009, 06:03:33 PM »
If you get an alternator with remote sense, you don't need to worry about voltage drops (from wire or from diodes).  But I wouldn't turn up a voltage to account for a voltage drop - the voltage drop is proportional to current flow, so when you are drawing low current, the voltage will then be too high.




7
Generators / Re: One engine two alternators.
« on: September 16, 2009, 02:41:53 PM »
i also do not like fused alternator outputs, if for some reason you blow a fuse under heavy charge
the alternator voltage will spike to well over a hundred volts and may very well take out your regulator
or diodes in your rectifier bridge.


On the other hand, not using fuses/circuit breakers has some serious issues also.  So what is the solution?  Perhaps zener diodes or MOVs to absorb the spike? 

The same issue occurs at home when you have inductive loads and then the circuit breaker trips.  Other devices on the circuit may not survive.

The rust at the top of the box reminds me what it was like to maintain wiring on a boat.  I soldered where I could and used LPS3 on other connections.

8
General Discussion / Re: Government health care
« on: September 14, 2009, 12:46:31 AM »
I was talking to a PA and things are pretty messed up right now with the insurance companies making crazy decisions about what they will and will not pay for.  Things like: got pneumonia at the hospital - not covered, it must have been a hospital mistake.

Rationing at some level is fine (and occurs everywhere in life) - if you want some unusual, low success rate treatment,  there will always be places to get it if you pay for it or have supplemental insurance.

Dr. Bryner's post was very good although it didn't include the problem of the AMA restricting the number of doctors and other wage inflating tactics.

 I certainly hope we aren't at the point where people have hide their thoughts behind pseudonyms.  If something is wrong, stand up for what is right and put  your name behind it.

9
Generators / Re: mechanical burst generator
« on: September 10, 2009, 01:06:58 AM »
Looks like around 10 ohms for a 1HP/240V motor.  5 ohms if 120V.  Maybe 6 and 3  if you need some torque.  Around 25ft of 16 gauge nichrome wire.  Not sure what I can wrap it around - a concrete block?

If switching something in for starting, might as well also switch in another capacitor to get the PF close to 1 while starting.  Ie, a SP/DT switch that disconnects the capacitor and shorts out the resistor once the motor is up to speed.






10
Generators / Re: mechanical burst generator
« on: September 09, 2009, 10:18:42 PM »
I think it depends on the starting torque needed - a free spinning table saw might be ok, a saw jammed with wood might not be.   Centrifugal pumps and fans are also free to spin slowly.  Also depends on the resistance used - what is a good target value?  Maybe 2x normal running current? (with most of the voltage drop occurring  in the resistor, so no chance of motor overheating).

I know that "starting reactors" are used for the same purpose.

Edit: found reference to using 1.5x for starting unloaded motors.

11
Generators / Re: mechanical burst generator
« on: September 09, 2009, 04:26:40 PM »

My understanding is that is reduces starting torque, but doesn't otherwise effect the principles of operation.  You still have a phase shift between start and run windings.

Should make the motor last longer too.

12
Engines / Re: Lister engines in storage
« on: September 09, 2009, 02:02:58 PM »

Some people plug up the intake and exhaust and put a desiccant inside.  Seems like it might help.

13
Generators / Re: mechanical burst generator
« on: September 09, 2009, 01:24:40 PM »
Sounds like I should get some nichrome wire and something to wrap it around.


14
Generators / Re: Start-o-matic alternator :(
« on: September 09, 2009, 01:23:43 PM »

I would just buy a variable speed drive - VSD to create 3phase from 1.  They are very inexpensive now -  plus variable speed can be useful and starting loads are lower.




15
Generators / Re: mechanical burst generator
« on: September 08, 2009, 02:31:38 PM »

It looks like various companies make electronic soft starters, even for single phase motors.  They slowly ramp up the voltage.  So this is the easy way to go to get motors started without large current draws.

   
Telemecanique Altistart 01  is an example.

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