After taking it back to the garage, I used a piece of wood and a mallet to alternately hit each end of the primary; after a few minutes it slipped fully off the core. The Li-ion battery electrodes synthesized by the research team charged up to 90% in 6 min. By setting the pressure and time based on the materials being welded, it should turn out almost perfect welds. Mike, I realize that your post regarding your MOT welder build is a bit dated, but I was wondering if you might be able to set me up with some 230v or 240v MOTs. However, this simple circuit has a limitation due to the associated voltage drop; when activated, there will be a voltage drop at T1 (VCE,SAT) of ~1 V and across RSENSE  of ~0.6 V. The total voltage drop is ~1.6 V. Therefore, if the current limiter is connected with a +5-V supply, the load will get ~3.4 V, which is unacceptable in low-voltage circuits. Would you mind expanding on “will not play nice”? A simple, widely used current limiter consists of a current sensor (usually a low-value sense resistor), a control circuit, and a pass transistor. Current limiter circuits are key to power supplies, protecting them in cases of a short circuit or other overload condition. I removed my stunts. Seems like a better method would have been to make a saturable reactor? aster charging and longer-lasting battery material for electric cars depend on batteries of various design. The load resistor was slowly reduced from its maximum value, and voltages across Q1, RSENSE, and the load were measured (Fig. Unlike current limiter that uses only a resistor, this current limiting circuit doesn’t drop the voltage, or at least keep the voltage drop at minimum, until a certain current … 5. Materials science researchers at Pohang University of Science & Technology (POSTECH) in Korea have developed a method for extending the life of Li-ion batteries. By adding a variable wire wound resister to the coil of your current limiting transformer would allow you to vary your output current more easily. Despite its internal complexity, the entire current-limiter circuit can be considered as a three-terminal device. He can be reached at sajjad_haidar@yahoo.com. I’ve seen people around the net using 200$ variacs, high current scr circuits…you did it for free! I would worry a little about using one for an arc welder as it will reduce the voltage and make it tricky to get an arc going; would be perfect for a spot welder though. The base current of T1 is drawn by T2 and, as a consequence, the emitter current of T1 drops. When the load current reaches a value that drives Q2 into conduction, gate-source voltage VGS of Q1 goes low, which forces the load current to go low. Is there only a primary coil on your amperage control mot, Looks like a fun weekend project. Works well so far. I’d love to see a saturable core one to see how it compares, if you know of anyone who’s built one. The output of IC1 controls the drain-source resistance (RDS) of low-threshold MOSFET Q2, and the drain current of Q2 controls the LED current of VOM1271, a photovoltaic MOSFET driver.4. The full circuit diagram is as follows. I’m interested in a welder project but 115v primary just won’t do. “This research has laid the foundation for developing Li-ion batteries that can achieve quick charging and discharging speed, high energy density and prolonged performance,” said Professor Byoungwoo Kang, a co-author of the paper. For adjustable current limit, the gain of the op amp is controlled by the variable resistor R5. Hi. I installed some neat-ish wiring, leaving some slack in the current limiter wires to allow movement without any strain. At the maximum load current of 1.3 A, the voltage drop across RSENSE of 0.145 V is a significant contributor to the overall drop. The problem with reducing the particle size is that it decreases the volumetric energy density of the batteries. Once they were welded together, it was a trivial matter to bolt them down to a board. I knew it might happen, but just got too carried away with my new toy. Have a look jfpayeur.com. 1. https://en.wikipedia.org/wiki/Current_limiting, 2. http://www.ti.com/lit/ds/symlink/lm317.pdf, 3. http://www.electro-tech-online.com/articles/adjustable-low-drop-current-limiter.660, 4. http://www.vishay.com/docs/83469/vom1271t.pdf. To everyone looking for a simple circuit to control output of a mot welder .I think a mag amp circuit may work.what little Ive read on them you could actually control current and voltage on in and out of transformer by saturating core.may build up heat ,but a good cooling system should work. A ceiling fan speed controller??!! Unfortunately in the process the paper wrapping remained stuck and pulled a few turns free of the main winding. If you were to apply capacitors in parallel with the inductors you could slightly cancel out the reactive power that overheated your first transformers when you got carried away welding. Could this be causing my primaries to overheat? I also feed an old 12v wall wart power supply from the mains. Wow. Might be built for inductive loads but its current capacity isn’t even close to being enough. The driving range of an electric vehicle (EV) depends on its battery performance. If you want to buy something off the shelf to “dim” a high power inductive load you can get something called a variac; it’s an adjustable transformer that allows you to gradually turn up the voltage while keeping the nice sinusoidal waveform. If red clip is connected to posive terminal, the black clip must connected to Vcc of the component. Have you considered adding a full-wave bridge rectifier onto your output AC power so that you can weld using direct current and provide the choice to weld DCEN and DCEP to suit a broader range of materials? However, lithium-ion batteries dominate battery types used in EVs, One area in Li-ion battery research that remains unresolved is how greater power can be produced by significantly reducing the charging and discharging time.

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