Questions tagged [power-transmission]

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2 answers
38 views

How are power transmission mechanisms suspended?

I just saw this diagram and it looks like the bottom shaft and the two gears it goes through would just fall down? and this is a confusion I have in general about power transmission mechanisms. How ...
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2 answers
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Wind-up toy car constant speed problem

Set Up: In a classic wind-up car we store energy in spring. The energy then used unequaly in time resulting variable speed during the ride. Max torque and power and acceleration at the begining, with ...
1 vote
0 answers
48 views

Why does an electric motor, of 800 kW at 400 V, have 7 connectors for power cables?

I found a Vybo electric motor and noticed that it has seven connectors for power cables. I also found a Variable Speed Drive, Altivar Process ATV900, System ATV960, 800/630 kW, 400 V and its datasheet ...
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1 answer
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What is GPS and TR in EMTP RV?

I Want to simulate following system in EMTP RV but i dont have any idea what is GPS and TR(transiet recorder)
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2 answers
60 views

Wheel's torque and differential gearbox

I know that the differential gearbox is providing a torque to the wheels; as the relation in the figure indicates : Tw (wheel torque) = Td (differential torque) × (ηd×nd). Where nd:is the differential ...
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0 answers
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Does "stacking" of thinner timing pulley and belts reduce "belt stretch", as using a wider belt would?

When wanting precise belt driven motion, it is desirable to reduce belt stretch by using a wider and/or stronger belt. Wider GT family can be quite expensive (hundreds of dollars) compared to thinner ...
-1 votes
4 answers
45 views

Shifting Between Gears To Achieve Higher Acceleration

If the car's acceleration is higher when the wheel's angular acceleration is higher(tangential acceleration=alpha x radius). Why are higher gears not used to accomplish the acceleration of the car ...
29 votes
3 answers
6k views

Why are two wires used in railway overhead equipment?

While watching the train videos, I came across these overhead wires. After searching on the internet, I found that both catenary and contact wires carry the same voltage and are connected by vertical ...
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0 answers
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Mathematical Modelling of Wireless Power Transfer in Biological Tissue

I am trying to develop a mathematical model which describes wireless power transfer through layers of biological tissue, with power being transferred from an external transmitting antenna to a ...
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0 answers
42 views

Can a grid connected PV system deliver power backwards through the distribution transformer?

If there is no local load demand can a residential roof top grid connected PV system deliver power across distribution transformer [up to the higher voltage grid]? Suppose my grid connected solar pv ...
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0 votes
1 answer
54 views

Clutch for rotating axis of mount used for astronomy

a short disclaimer that for me mechanical engineering is a hobby. Please be gentle with me, even if there may be an obvious answer. The main reason for asking here is that searching for the topic you ...
0 votes
1 answer
44 views

How to pick a motor that won't stutter/vibrate?

I built a system that has 4 rods with a block attached at the end that rotates in a circle and stops every 1/4 revolution of a cycle. It then starts back up after a certain amount of time. What I ...
1 vote
1 answer
204 views

Rotational lock design for a landing gear of an aircraft

I want to design a rotational lock mechanism for the landing gear of an aircraft. It's function is to make sure the landing gear stays folded when the aircraft is on air and the landing gear's ...
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Can I use a PWM motor regulator to control a LED string?

I recently bought some LED Christmas lights, but they are too bright. So I was thinking that maybe I could regulate the output by using a PWM regulator? My LED lights have an output of 30V from the ...
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1 vote
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Household 3 phase devices

So, I'm not sure if this is the right place to ask this, but have been working on modifying a lawn mower robot that has, for roughly 3 years now been stored under less than favorable conditions. As a ...
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0 votes
1 answer
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Power systems unclear voltages

I was looking at this problem: "A balanced delta connected impedance load with (12+j9)Ω per phase is supplied by a balanced three-phase 60 Hz, 208-V source " I do not wish to ask for help at ...
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-1 votes
4 answers
100 views

How does gearing affect top speed and acceleration exactly [duplicate]

I was just reading an article about "What affects a car's overall top speed" and it left me wondering how gearing affects top speed and acceleration. While I did manage to learn how ...
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3 answers
96 views

How to convert car power into energy (MJ) used per km?

I am currently attempting to do an energy audit regarding how much energy my car uses per kilometer. I am not sure whether my approach to this is right, and it feels like I have made too many ...
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2 answers
89 views

Fiber optic Power transmission [closed]

Is it possible for fiber optic cable be used to transmit "Power" to run machines as opposed to data?
0 votes
1 answer
41 views

XL timing belt missing Dimension!

I'm trying to design and 3d print a XL pulley. I think there is a missing dimension that I can't find in the spec tables. we've got pitch circle, teeth height, belt thickness... but I can't find ...
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2 votes
1 answer
125 views

Cross-drive steering transmission forward movement

The following is a diagram of a cross drive steering transmission component. The labels are in German, but my following explanations will be in English. (from https://de.wikipedia.org/wiki/Datei:...
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2 answers
75 views

Is transmitting windmills' mechanical power to ground level that complex?

Thinking about the complications of building and maintaining turbine rooms installed at high altitudes in horizontal axis wind turbines (plus the difficulties related to it when, for example, a fire ...
1 vote
0 answers
56 views

Power calculations for starter motor designing [closed]

Let's consider an IC engine standard type motorcycle. What is the power needed from the starter motor to start it's engine? Please make all the calculations by taking suitable assumptions like the ...
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4 votes
3 answers
184 views

How does my automatic car shift without complete temporary loss of acceleration

When my car shifts gears, the car's acceleration never goes to 0. I feel that there is constant torque to the wheels throughout the entire shift. How is this possible during a gear change? ...
3 votes
2 answers
454 views

Why are both conductors in a High Voltage Direct Curent powerline isolated from ground?

Picture of a High Voltage Direct Curent powerline (HVDC line) on the Læsø Island, Denmark (from Google Street View): We can observe that there are 2 conductor cables, and that both are insulated from ...
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1 vote
0 answers
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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?
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2 votes
2 answers
454 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 ...
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0 votes
0 answers
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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 ...
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3 votes
1 answer
367 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 ...
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0 answers
68 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 ...
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2 votes
0 answers
98 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
0 answers
48 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 ...
1 vote
1 answer
55 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
1 answer
27 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
3 answers
227 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 ...
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2 votes
0 answers
44 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 ...
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4 votes
2 answers
1k 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 ...
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1 vote
0 answers
22 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
1 answer
198 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 ...
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1 vote
0 answers
50 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
1 answer
30 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
1 answer
51 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
3 answers
219 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 ...
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1 vote
2 answers
203 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 ...
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-1 votes
1 answer
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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?...
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2 answers
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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 ...
1 vote
4 answers
203 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/...
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2 votes
1 answer
226 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 ...
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3 votes
3 answers
418 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: ...
2 votes
3 answers
146 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 ...
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