90V DC Power Supply Sanity Check
I need a roughly 90vdc power source for a brake on an AC motor. At this stage, I'd just like to simply release the brake. The resistance of the brake at room temperature is 1.2kohm. At 90v, this corresponds to a current draw of 75mOhms, correct? I'm not sure the best way to make a 90V power supply, so what I'm wondering is if I can make a simple full-bridge rectifier to rectify AC to DC, and have some filter capacitors and of course a fuse. I've not made such a power supply before and I've messed around w/AC *very* little. However, it seems like right now it's a good choice and I need to learn about AC electronics more and more. Right now, my plan is to use a 2kv variac (which I have on hand) to slowly raise the voltage in a full-bridge rectifier -> capacitor -> load circuit. This way I can test if my rectifier is working as I hoped at *really* low voltages, and slowly raise it up to the voltage I need. However, AC scares the crap out of me so as a sanity check I thought I'd run it by ya'll. Yes, It’s OK now to use a variac for testing purposes . Need to use some 400V rectifier bridge (1 Amp minimum current handling capability) and for the capacitor use some polarized electrolytic type capacitor value starting from 47uF/350Vdc up to 100uF/350Vdc. A high voltage capacitor it’s recommended now as during the tests accidentally you may reach the upper limit of the power supply line, but later on, using some fix transformer (75-90Vac output) you may use standard 160Vdc -250Vdc capacitors. Yes, my units were wrong on the current rating! 11pm... How do you determine the upper capacity limit for the capacitors? I Have some 20000uF 400V capacitors here, can I use them? Since I will slowly raise the voltage, they shouldn't draw too much current. I can probably put a current limiting thermistor or resistor in addition to a fuse there as well.
90vdc Power Supply - Bookshelf
Physical Modelling in Geotechnics, Proceedings of the Sixth International Conference on Physical Modelling in Geotechnics, 6th ICPMG '06, Hong Kong, 4 - 6 August 2006
The bender driver is powered by a high-voltage power supply (input: 110 VAC; output: 90VDC, 200 mA max) that is enabled only during shear wave measurements. ...Thomas register of American manufacturers and Thomas register catalog file
... 3401 Clutch/Brake Controls Coll Coll Lino Logic Inputs On/Off Power Supply Relay Power Supply w/built-in Over-Energizer 90VDC 90VDC 120 VAC 120 VAC 120 ...Thomas register of American manufacturers
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It operates from a single-polarity 22 V to 90 Vdc supply and delivers ± 20 A peak at ± 80 V, ± 10 A continuous. It has a switching rate of 25 kHz, ...Homemade lightning, creative experiments in electricity
Power supply Gear motors draw little current, about 1.1 amps for these 90-Vdc motors. You can use a variac or rheostat to step down the 110 Vac and then ...Casual Walkthroughs Directory
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