Questions tagged [power-transmission]
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41
questions
33
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4answers
34k views
Transmitting power over long distances what is better AC or DC?
I found this answer to a related question. The part of the answer that's confusing me is:
Transmitting DC power over a long distance is inefficient. Thus AC supply is a far more efficient to ...
4
votes
2answers
342 views
How to connect a motor shaft to a plate
I'm trying to drive an aluminium plate using a motor via a 20mm-wide 2mm-thick stainless steel tube. The tube is driven by a 6mm motor shaft via a pulley and the torque will be around 5Nm at most. Is ...
4
votes
1answer
553 views
What's the history of the 345 kV voltage level in power transmission?
I'm interested in the history of the 345 kV power level for high voltage transmission in the United States. I've got two (and a half) questions:
According to this source 345 kV was first applied in ...
3
votes
3answers
273 views
Torque and RPM calc
started by designing the gear meshing, and now I need to calculate some parameters to determinate if this meshing works for me.
The system considers an electric motor, which technical parameters are: ...
3
votes
4answers
171 views
How does power generation (hydro, wind etc…) account for variable power consumption?
I know in a power distribution system, the power is generated (from a dam or turbine or something) and consumed immediately.
But the power consumed is variable. So how does the generation system take ...
3
votes
3answers
150 views
Why in the construction of power transmission towers , the rods are hinged oblique? [closed]
I know if a rod is hinged at its two ends and if there is no load act upon it along its length then the forces exist only along its length but i don't see how this characteristic comes into play ?
2
votes
2answers
426 views
Right angle gearbox, proper name or design
I'm looking for right angle gearbox, but everything is horrible expensive or in parts like two bevel gears from aliexpress.
Where I can find or how to name transmission like this in the picture but in ...
2
votes
4answers
124 views
Wind turbines with down tower power units. Why aren't they more common?
Concerning the big megawatt wind turbines, if there is such a big trouble with gearbox bearings failing much earlier than expected and costly maintanence or replacement of huge gearboxes, what is ...
2
votes
1answer
46 views
Gear Ratio of a Stepped Planetary Gearset
I was looking into planetary gearsets, and came upon the concept of a stepped planetary gearset. In the image shown above, if my input was the blue sun gear, the output was the planet gear, and the ...
2
votes
1answer
64 views
How much aluminum does a HV, MV or LV transmission line use?
I have accurate statistics about the total length of high-voltage (110-400 kV), medium-voltage (1-70 kV) and low-voltage (0-1 kV) transmission lines in my country, and they are:
High-voltage: 22 500 ...
2
votes
4answers
228 views
Find clutch for parallel hybrid sailboat
I am replacing my dead diesel engine in my sailboat.
I wish to replace it with a new diesel and an electric motor in parallel hybrid.
Hybrid vehicle drivetrain
This would allow me to:
Run the ...
2
votes
0answers
37 views
Optimum spoke shape for wheels made of solid material
Currently I am designing a bicycle sprocket to be laser-cut out of 3mm steel. Steel is heavy, so I want to make some lightening cut-outs, and I want to optimize the shape of the cutouts. I will ...
2
votes
0answers
25 views
I'm looking for the simplest way to increase rotational speed from 120 to 5,000 rpm for a light duty device
I'm currently designing a device and want to increase speed from 120 to 5,000 rpm. Device is lightweight, hand operated, free spinning, low torque in/out. Picture a cheap fertilizer spreader from Home ...
2
votes
0answers
33 views
Exceed 'designed' speed ratio of timing belt
I'm trying to create a setup to transfer motion from a motor to a shaft that requires a much higher torque (bi-directional). The housing is about 6 inches long and the speed ratio needed will be ...
2
votes
0answers
129 views
How do I calculate the velocity of the piston?
I have a system with a motor connected to the trapezoidal lead screw. The lead screw is connected to the tube which is connected to the piston. The piston has to pump 1000cc oil against a pressure of ...
1
vote
3answers
107 views
Attaching Gear onto Motor
I want to attach a 12 toothed spur gear with a bore diameter of 6mm onto the shaft of this motor (6mm diameter). How would I go about doing this? From what I see, the shaft is smooth so is my only ...
1
vote
1answer
68 views
Why do trains use the same wheels for staying on track and propulsion?
Trains where originally designed to keep the train on track. At the time trains where pulled by horses and used to transport coal (and such) out of mines. The two functions have very different ...
1
vote
1answer
25 views
Delivering RPM from a fixed wheel to a moving wheel
I have spent the past few days thinking about a good way to get power/RPM from a fixed wheel delivered to a wheel that is able to move in a 2D plane relative to the fixed wheel. I am not too good at ...
1
vote
3answers
68 views
Key fitting - Shafts and Gears
I am designing a gearbox and wanted to know whether the key on the shaft and gear must fit exactly with the bore in the gear and keyway in the shaft.
Ex. If there is a key that is 3x3 mm, and does the ...
1
vote
2answers
44 views
What is name of clutch system in a roller shade?
I am trying to figure out what the exact term is for the clutch system used in a roll-up window shade.
I thought they were called centrifical clutches, but that typically gives me the opposite ...
1
vote
1answer
14 views
How does free space path loss change with receiver's antenna's height
I have a question which seems like an easy one, but I couldn't find anything on Internet to be 100% sure.
The free space path loss equation is:
$$FSPL=20\text{log}(d)+20\text{log}(f)+20\text{log}(\...
1
vote
1answer
37 views
Does the voltage rating on transformer plates account for losses?
According to basic electrical machinery theory, all transformers experience power losses due to winding resistances, eddy currents, leakage flux and hysteresis. So when a load is connected to, say, a ...
1
vote
1answer
151 views
Working of spider gear in differential axle wheel mechanism
What causes the spider gear to spin about it's own axis while the vehicle is taking a turn?
1
vote
1answer
2k views
Linear actuator on a scissor lifting table
I am designing a scissor lifting table and I have an issue with the linear actuator. This table should be lifting 100 kg. I studied the problem in two ways : a static study and a power study. My ...
1
vote
2answers
1k views
Driving many parallel shafts from one motor
Is there a preferred solution to the problem of driving parallel rotary shafts from a single motor?
I have six shafts that I want to drive from one motor. The shafts are all:
rotating the same ...
1
vote
0answers
29 views
What are the limits of small 3D printed gears?
How much tangential force should I expect a 10~20mm pitch diameter/1.5mm gear module 3D printed rack and pinion system to support without breaking nor sliding?
1
vote
1answer
46 views
Precision of a steeper motor and gears vs multiple motors
We are a student team trying to design a low cost CNC plasma cutting machine.
The CNC will be a table with two rails and a bridge moving on them in which the head of the plasma torch will be.
Now we ...
1
vote
0answers
18 views
Is there any way to simulate belt transsmition with non-circular cog?
I want to do a simulation of a transmission with toothed belt and elliptical gear. I've tried in Autodesk inventor by modeling wheels separately and then adding a belt with the "synchronous belt tool" ...
1
vote
0answers
29 views
Bevel gear friction and inertia calculation
I want to calculate the friction and inertia between 2 bevel gears with straight teeth.
I know how to calculate those parameters between regular gears with straight teeth.
Is there any difference for ...
1
vote
2answers
341 views
Torque Required to Drive Capstan and Bow
I am trying to find the torque exerted on the shaft of a capstan and bow drive. In particular, the system I'm looking at has two wire rope pulleys, and two idler pulleys, and is used to drive a ...
1
vote
1answer
424 views
Faraday cage to reduce EMI in audio amplifier
western United States.
Problem / Question
The bad power in my house is somehow producing EMI in my audio equipment. Will a simple Faraday cage help? (Using an aluminum metal screen)
If not that, ...
0
votes
2answers
2k views
What is meant by “shock load” in gears?
What is meant by shock load in gears?
What are steady, light, medium and heavy shock loads?
0
votes
1answer
1k views
How do I connect a plate to a D-cut shaft?
i'm trying to connect a D-cut shaft to a plate for transmission of torque
This is the motor that i am using with a 'diameter' of 4.5+/-.1mm
My first question is whether I can use 5mm circular ...
0
votes
0answers
27 views
How does tractor achieve constant PTO speed?
Tractors have a PTO shaft which supplies power to implements. Most implements are rated 540 or 1000 RPM.
I'd like to know more about transmission that is used to convert variable motor shaft rotation ...
0
votes
0answers
44 views
Could railway overhead wires be used for long distance electricity transmission?
Most electrified railway in Europe operates at 15 kV 16.7 Hz AC or 25 kV 50 Hz AC.
Power is typically produced between about 2.3 kV and 30 kV and stepped up to 115 kV to 765 kV AC for long distance ...
0
votes
2answers
90 views
Faster car drifting (motorsport) when using limited slip vs welded differential
I have been drifting RWD (rear wheel drive) cars for some years now. I tend to think about every engineering solution that other drivers use and how does it work before applying it to my car.
What ...
0
votes
3answers
132 views
How does ferranti effect occur?
I search and read about Ferranti effect online, but none seems to be clear enough for me to understand how it actually happens. I must say, I do not have much prior knowledge about inductive/...
0
votes
0answers
83 views
Can you use a flex (spider) coupler as a dog clutch in a motorbike/atv/go kart/lawn mower like setting?
My question is simple: I want to make a dog clutch system for a wakeboarding cable system and was wondering if a flex (spider) coupler could used? The power, velocity, torque is similar to a go kart /...
0
votes
0answers
41 views
Why are there no fully diesel electric cars?
Diesel electric locomotives seem popular, even these days. The UK's Type 45 destroyers have tried integrated electric propulsion, and I think that there are hybrid motor-generator cars that can ...
0
votes
1answer
255 views
Equations for power transmitted by a flat belt drive
I've come across two equations that relate power transmitted with the belt tensions:
$$\begin{align}
P &= 10^{-3}(T_1 - T_2)(k)(v) \\
P &= 10^{-3}(T_1 - T_c)(k)(v)
\end{align}$$
As you can ...
-1
votes
2answers
391 views
Why is it bad to run power through BNC (RG58) cables?
A standard practice in many academic labs, which I'm told is "bad practice", is to use RG58 cables (i.e. standard BNC cables) for power distribution.
Question 1: Why is this considered bad practice?...
