Questions tagged [electrical-engineering]
Study and applications of electricity, electronics, and electromagnetism. Use this tag when someone who has trained as an electrical engineer is likely to be able to answer your question.
1,568 questions
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How is an EV charger modeled during power system faults?
When an EV is charging and a fault occurs in the distribution network, what typically happens to the EV charger? Does it continue drawing power, limit current, or disconnect due to protection? Also, ...
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How does cell internal resistance mismatch affect capacity fade in a 6S Li-ion pack over 500 cycles?
Background:
I am designing a 6S4P Li-ion battery pack (~22 V nominal, 1000 Wh) for a portable industrial device targeting 500 charge cycles. I am sourcing cells in bulk from a distributor and have ...
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In situations where demand is DECREASE, what strategies have you seen work best to reduce product while minimizing technical risk and energy waste?
We operate three paper machines with average production:
PM‑05: ~70 tons/day
PM‑07: ~85 tons/day
PM‑08: ~115 tons/day
Due to lost customer orders, we have a permanent production reduction of ~700 tons ...
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Capacity factor
According to the book 'Economics of Electricity' by Cretí and Fontini, Capacity Factor is defined as:
" the fraction of time over a total amount of time in which there is a given amount of load ...
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Electrical Engineering - Van Power Box
I am designing a 12V auxiliary power system in a van with a 2000W inverter and a 100Ah battery.
The system will be charged via the vehicle alternator using a DC-DC charger.
I am trying to understand ...
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What's the proper way to wind this motor?
I'm designing a 3-stage axial flux synchronous reluctance motor as a personal project. I want to use a distributed winding scheme, and the winding diagrams I can find are typically a bit opaque. I ...
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Can an electric planetary-gear CVT emulate a mechanical gearbox/transmission, requiring no net electricity source or sink to set gear ratios?
I recently learned of an "electric CVT" used in some hybrid cars, which (if I understand it correctly) is based on a single planetary gearset (sun, planet carrier, and ring) with one piece ...
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Electric 72V Motorcycle; Motor and battery cell selection
I am designing and building a custom electric motorcycle intended to be street-legal in the EU, starting in AM catagery and later upgraded to A1.
The goal is to design the system for the start to ...
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Signals penetrate through metal
Can any wireless signal (Bluetooth, RFID, NFC, LoRa, etc.) penetrate 3 mm thick sealed metal 1 x 1 cm box if I drill four 2 mm holes and fill them with epoxy? If not, how I can trigger a simple on/off ...
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Load cell cable lengths
I have 4 load cells connected in parallel formation assigned to one ADC. Is it imperative that the wires are the same length all round? I do recall that the Wheatstone bridge will compensate for such ...
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Could you please check this DC motor reversing circuit for me? I tried and it just didn't work
I'm trying to build a DC motor reversing circuit using two relays (H-bridge style), but my circuit is not working.
Here is my setup:
Power supply: 5V
Relays: SRD-05VDC-SL-C (5V coil)
Control: push ...
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Why are bathroom extractor fans generally installed near the ceiling?
Surely pulling droplets of water towards the floor would be healthier, (especially droplets created from a toilet flush), and easier, and you'd be sucking out cooler air which would save energy in ...
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compressor power factor intermittently dropping
I have a 22 year old KitchenAid bottom freezer fridge (KBLA20ELSS00) that I need to keep alive.
Four years ago I installed a new compressor, quite an adventure. It has been working fine since, but now ...
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What distinguishes engineering validation from simple functional demonstration in prototype design projects?
In student or early-stage engineering projects, prototypes are often built to demonstrate that a concept “works.” However, in professional engineering practice, validation typically involves a more ...
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Logic Diagram to Electronic Schematic part 2 [duplicate]
This is the simulation of my circuit in Proteus after making some adjustments. The LED still does not light up. So the problem is probably in the circuit design itself.
