All Questions
Tagged with electrical-engineering power-electronics
96
questions
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19
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Why isn't my valve controller not providing sufficient amount of voltage to my fan?
We're using the valve controller below to control the speed of a (generic) fan: https://products.axiomatic.com/viewitems/valve-controls/can-to-4-outputs-valve-controller
Problem: We're supplying the ...
- 103
1
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34
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Strange inverter PWM output signal at startup
I’m monitoring the output of a 3-phase inverter with an oscilloscope, the inverter is a Siemens Sinamics V20.
I see that when I enable the power output of the inverter, I have a strange sequence ...
- 11
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1
answer
128
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What would be the best capacitor to use for a railgun that uses a capacitor as the projectile?
I have had a long-time interest and fascination with railgun technology and for a long time I have wanted to build a small-scale, simple railgun as a scientific experiment. This railgun is designed to ...
- 303
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1
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34
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Faulty capacitor identification
I was testing my SVPWM power board with a light bulb load instead of the AC servo motor. It worked a few times while testing. The bulb would turn on and my PWM was verified.
The last time I turned it ...
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2
answers
60
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Can wireless charging become more energy efficient?
I've stumbled upon a few articles saying that wireless charging takes more energy to charge something compared to the cable. Like this one.
Like in the test from the article, it takes 47.33 % more ...
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22
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Question about time system of first order system
can anyone plz explain this next step? how this has been done
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55
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Strange problem with Impedance?
I've encountered a strange problem with a 12V key-fob device. We use a device to remote control a relay via a key-fob transmitter. It's installed in a plastic box that is mounted at an operator ...
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votes
1
answer
93
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Proposing a Transfer Function from a Response Graph
I need to propose a transfer function from the following graph. The K value (or amplifier gain?) we were given is 2 and it has a step response of 2 as well. When looking at the graph though it looks ...
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1
answer
703
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Does wiring heat elements in parallel vs series at the same power affects the results?
I am designing an electric kiln just for fun and I found myself not knowing how to answer this scenarios.
The main constant is power. The final power must be the same in each case. My question is ...
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36
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Peculiar step-down transformer behavior
I have wired several loaded transformers and when calculating power on H vs X side by multiplying current times voltage the wattage is not even close to equal with the H side having 2 to 3 times more ...
- 1
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15
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what is the problem with j1000 drive?
I have problem in the drive-J1000, not running , shows F 9.50 on display , just twinkling here is a video
https://drive.google.com/file/d/1JasqdFWffqOWf1wKko-XR6xYs1OKAzdu/view?usp=sharing
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1
answer
60
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Why do inorganic LEDs wear out?
Why do inorganic LED bulbs have a limited lifespan? For example, a manufacturer may quote that a bulb or monitor powered by an organic light emitting diode(s) has a lifespan of 50,000 hours, while it ...
1
vote
1
answer
82
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How Is a Gap Maintained Between the Stators and Rotors in Axial Flux Motors?
From my limited knowledge, the closer two magnets are together, the stronger the attraction and repulsion force. I'd assume that would mean a motor designer would want the stator and rotors as close ...
- 121
1
vote
1
answer
67
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How does a Charging Station stop a charge with an EV connected
I'm trying to control a charging station with a raspberry pi. The software is almost finished by there is something missing in the electrical architecture of my CS. The EV is connected to the CS with ...
1
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0
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49
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What should be the clearance and creepage for the line to line 440 Vac and line to neutral 240 Vac of the three-phase system on PCB?
Also is there any link to calculate this as per the UL and other industrial standards
- 11