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    VFD (Variable Frequency Driver) for 3-phase motors.

    Go to Smith Electric Motorworks web site. This will give you a good education on Rotary phase Coverters.
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    VFD (Variable Frequency Driver) for 3-phase motors.

    It's a question of semantic's. Like the other post indicated: many VFD's use PWM to "control energy". A Rotary Phase Converter isn't a VFD per definition. In the original post the goal was to operate a 3 phase motor from single phase line. This can be done with a...
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    VFD (Variable Frequency Driver) for 3-phase motors.

    A lot of good information be shared here by all. I can sometimes be vague or use wrong terminology, for which I apolgize. When posting about the Rotary Phase Converter, the term Pony motor was used in place of what the video calls the idler. This ”idler” must Be in operation continously. And...
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    VFD (Variable Frequency Driver) for 3-phase motors.

    If it's just a hobby , and for your self, I wouldn't worry too much about the insulation factor. Like I responded to the other fellows post. I only use Inverter rated motors on new installations as good practice. Some of these older motors probably are more rugged...
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    VFD (Variable Frequency Driver) for 3-phase motors.

    You are correct. In all the "New" installations I used an Inverter rated motor, as "Good Engineering Practice". Yes , filters can help, provided you know you need them before you destroy the motor.. It was easier to just use the correct Inverter rated motor. I've used line...
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    VFD (Variable Frequency Driver) for 3-phase motors.

    Your biggest issue you will have in replacing 3 phase motors with single phase motors is the motors footprint. A 1 hp single phase motor is huge: 3 times the physical size oft he 3 phase motor. If you can reduce your motor requirement to say' 1/2 hp,you might get by...
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    VFD (Variable Frequency Driver) for 3-phase motors.

    I applaud your interest in building a VFD. I've gone this route myself and found it not economically feasible, not to say you won't be successful. You may have better resources. There are options. The reason for my reply to your post is the fact I wanted a VFD for...
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    PCB, Toner transfer method

    i’ve decided to try making some PC boards using the toner transfer process (using laser jet printer). The process calls for using multiple passes through a laminators To transfer the image from paper to the copper. An alternative is to use a clothing iron. Another thought is to use a hot...
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    Need help choosing a substitute regulator component

    No, I really don't need a variable supply for this application. I've been using the variable Conar supply in my shop, and it works well, and it it is simple. For that matter, it does go to 12VDC, I wanted 14VDC as the top end because 13.8V would be optimun..I guess 12vdc...
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    Need help choosing a substitute regulator component

    I looked at the kits on e-bay for the LT1083 which contain only a populated PCs but no transformer:around $10. Then I found this complete switching supply for around $15: My plan is to use this supply to power a automobile car sound system from 110vac mains. I’m hoping the switching does not...
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    Need help choosing a substitute regulator component

    I have a Conar power supply, Model 320. It uses only a few compnents: full wave bridge, transformer, a few capacitors, and a 4 terminal IC (UA 78HG), T05. Package. Pos. Voltage regulator. I’m having a difficult time finding the UA 78HG. ( four terminal, variable, pos voltage regulator) I...
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    Can minor fumes from old tubular lead acid batteries cause permanent damage to lungs

    I had maintained relatively large battery banks (130V @ 1200 Ahr) for 25 years as a Automation Tech in the Natural Gas industry.. The sulfuric/lead / acid types typically emit Hydrogen gas, and hydrogen gas detectors were used to turn on an exhaust fan @ 25 ppm...
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    Can minor fumes from old tubular lead acid batteries cause permanent damage to lungs

    I worked
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    Capacitor ESR Testing: do you? Should I? How to?...

    Typically, the best way to test motor start and run capacitors is to replace them. The motors are usually integral with the compressor and need to be replaced as a single unit. The capacitor is the least expensive external part and substitution is the best test. An VOM/ohmmeter test...
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    Killing SSR (relays) - Need to understand

    You would have more reliability if you use Power Contactors (Power Relays) to apply power to the heating elements. You can use the SS relays to activate the coils of the Contactors. I use a similar circuit to operate an air dryer for an air power system. The temperature...
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    More questions about transformers.

    Often confusion follows when talking about Earth and Neutral. Instead of calling it a Neutral, think of it as "The other current carrying conductor", or "return current conductor". An Earth Ground or Bonding wire is only intended to carry " fault current" , and we...
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    Why I prefer electronics to plumbing

    Before putting away: primer, glue, even paint....feed a hose from your unlite propane torch into the can for a few seconds. The propane (heavier than air ), will force the air out of he container and will keep the contents from evaporating. I use nitrogen because I...
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    Thermocouple RF Ammeter

    I've seen them mounted at the transmitter output , permanently, at the transmitter end on FM Commercial broadcast installations. I alway's thought they work best connected at the base of the antennae , but not many techs, including myself , like climbing 100' towers. Two...
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    Ford Flat-Pack Ignition Modules

    These are ACE Super Coil #140033, used in 2004- 2008 Ford 4.6L/ 5.4L Modular 3 valve Direct Fire. Ford tech manual says test with an Ohmmeter and doesn't specify lead polarity when testing, which leads me to think it's nothing more than a transformer. Windings are bobbins on...
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    Ford Flat-Pack Ignition Modules

    I would like to build a test circuit for Ford flat Pack Ignition modules. The module has (2) pin terminals for input and a standard spark plug connector on the opposite end. The module grounds to chassis when bolted to the engine. On a known "Good" Coil, I measure very low...
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