Baluncore's latest activity
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Baluncore replied to the thread Running older induction motors on VFDs.Here is a crude first guess at what you need. It has max attenuation at VFD 3 kHz, 0 dB at 50 Hz. The motor model is a guess, now... -
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Baluncore replied to the thread Collection of Science Jokes P2.That is old news, and the asteroid turned out to be much smaller than last time. Remember flight MH370 ?
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Baluncore replied to the thread High School Motor building help needed please!.You need to mark the magnets so we know where the N and S poles are on the surface of those rectangular block magnets.
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Baluncore replied to the thread Running older induction motors on VFDs.You do not want any resistance in the path of the current to the motor. A snubber would use a series RC circuit, but not an LPF. For a...
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Baluncore replied to the thread Undergrad "The wavefunction never collapses".Maybe it is quantum mechanics that collapses.
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Baluncore replied to the thread Running older induction motors on VFDs.If possible connect the Y of snubbers mid-point to the neutral, avoid a ground connection. If no neutral, design delta a snubbers, or...
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Baluncore replied to the thread Running older induction motors on VFDs.That is why I suggest fixing the position of the windings, so they are not vibrated and chaffed by the harmonics. A snubber would...
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Baluncore replied to the thread Running older induction motors on VFDs.Have you considered flooding the field windings with epoxy resin to prevent movement ?
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Baluncore replied to the thread How to measure the diameter of a shaft without a caliper?.You could check your measurements by employing the white wall as the background, then observing the shaft through a lens, one focal...
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Baluncore replied to the thread Misc. Giving dog access to go potty when we're out.Maybe the inner sanctum, a restricted indoor enclosure for the cat, something that folds up like a child's playpen, floor to ceiling...
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Baluncore replied to the thread How to measure the diameter of a shaft without a caliper?.Another way: Place two straight edges against the diameter of the shaft, one on each side. Adjust the edges to be approximately...
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Baluncore replied to the thread Open circuit resonator not acting according to theory.Units police here. 50Ohm has problems. Ohm was a person, so ohm is the unit. 50 ohm is spaced, 50Ω is not. 47 kilohm is contracted, 47...
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Baluncore replied to the thread How to measure the diameter of a shaft without a caliper?.There are few metric or imperial shaft sizes, so there are few bearing inside diameters. The outside diameters depend on bearing...
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Baluncore replied to the thread Running older induction motors on VFDs.Definitely bigger, but too many turns will saturate the core. What is peak motor current? You need a core datasheet. The aim is to add...
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Baluncore replied to the thread Question about causality in s-parameters.With TDR of any form, everything beyond the second step or kick, becomes indeterminate pinball insanity, in a hall of mirrors.
