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Questions tagged [power-transmission]

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2 answers
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How is the city power grid routed and connected to individual locations such as houses?

I'm an electrical engineer but I don't know enough about the power distribution grid or civil. I'm no electrician either. My initial question is how does a new construction, like a home, get safely ...
Kevin's user avatar
  • 3
0 votes
0 answers
118 views

How to adapt a threaded drive shaft to a keyed shaft (for use with V-belt pulleys)?

I am sure there is a very simple answer to this question, but with no formal mechanical engineering education, I don't know what it is. I have a 2.5 HP, 3,450 RPM continuous duty electric motor with a ...
Colgate2004's user avatar
0 votes
0 answers
19 views

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 ...
tadm123's user avatar
  • 103
0 votes
0 answers
62 views

Are double universal (Cardan) joints exactly constant velocity?

Some double universal joints use a centering joint to ensure that the angle of the input and output are equal to maintain a constant velocity through the joint. From what I can tell, this centering ...
Ryan's user avatar
  • 67
0 votes
1 answer
28 views

High RPM CVT for Spindle Motor

I have been messing about with a 20k RPM spindle motor and want to try to have some more low end torque. I was thinking about using a belt or chain CVT so I can smoothly change gear ratios but is ...
Phaselancer's user avatar
0 votes
0 answers
13 views

Genetic algorithm implementation for gas/power/water network operation optimizaiton

I have both practical and theoretical background in power, gas and water networks operation and I am familiar with the basics of genetic algorithm. I would like to dive into the network operation ...
artp9's user avatar
  • 1
0 votes
1 answer
81 views

Fixing center distance of worm gear

For a worm gear setup in a metal casing, is there a way to fix the center distance between the worm and the worm gear being too far away other than scrapping the casing and make a new one? Reference ...
Thalva's user avatar
  • 3
0 votes
1 answer
66 views

How to connect 2 input shafts which will work independently to an output shaft

I am an undergraduate student in mechanical engineering. One of our professors project is to design a ski lift. A problem my team came across is how to connect the diesel and the electric engine into ...
aggrvs's user avatar
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0 votes
0 answers
29 views

How do you go about picking a belt in design?

So when you want to pick a beam to use or determining the thickness of a load bearing beam, or picking bearings, there is some calculations you do to see if its life expectancy or f.s or to see if the ...
codingnoob's user avatar
0 votes
1 answer
39 views

"move fast until resistance encountered, then gear down" mechanism?

This question may be too general, so apologies in advance if that is the case. I'm looking for a (relatively simple) mechanical system that will cause the driven element to move fast under no-load ...
stangdon's user avatar
  • 101
0 votes
2 answers
220 views

Would connecting a small hydraulic pump to a larger hydraulic motor result in force multiplication?

In a hydrostatic transmission system, hydraulic pumps drive hydraulic motors (basically a reverse pump). If you were use a smaller hydraulic pump as an input and a bigger hydraulic motor as the ...
Fulano's user avatar
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1 answer
57 views

Are there hydraulic torque converters that are specifically built to work like reduction gearboxes?

As far as I understood from this video, there are torque converters and fluid couplers (a hydraulic clutch), but certain types of torque converters kind of work by performing the two functions at ...
Fulano's user avatar
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0 votes
0 answers
30 views

Mathematical Modelling of Wireless Power Transfer

I am trying to understand the interaction between a transmitting antenna with a certain transmitting power (denoted PTX in the diagram) and how the radiation pattern of the TX antenna is affected by a ...
PikaPika's user avatar
0 votes
1 answer
20 views

A rotating, elevating platform driven by drive shafts

I have never built anything with gears before, and I find myself needing to do just that. Given that I have very little background, I'm mostly looking to be pointed in the right direction. The Task I ...
aetb's user avatar
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1 vote
1 answer
407 views

How to change the direction of a chain-sprocket system

I’m looking for a way to change the direction (90 °) of a motion transmitted by a basic chain-sprocket system. Is there such a thing as a chain-driven equivalent to straight bevel gears? I’m planning ...
Ludovik B.'s user avatar
0 votes
2 answers
88 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 ...
Hisham's user avatar
  • 109
-1 votes
2 answers
262 views

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 ...
Yury Komarinskiy's user avatar
1 vote
0 answers
82 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 ...
Robert Werner's user avatar
0 votes
1 answer
28 views

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)
arian hosseini's user avatar
0 votes
2 answers
354 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 ...
Jesse Flynn's user avatar
0 votes
0 answers
44 views

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 ...
user391339's user avatar
-1 votes
4 answers
70 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 ...
Jesse Flynn's user avatar
32 votes
3 answers
8k 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 ...
mech_duck's user avatar
  • 463
0 votes
0 answers
136 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 ...
Nandu's user avatar
  • 1
0 votes
2 answers
144 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 ...
roofkid's user avatar
0 votes
1 answer
53 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 ...
Georgije Stanisic's user avatar
1 vote
1 answer
861 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 ...
Kaan's user avatar
  • 11
0 votes
0 answers
209 views

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 ...
Pedery's user avatar
  • 101
1 vote
0 answers
39 views

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 ...
Mat NX's user avatar
  • 265
0 votes
1 answer
55 views

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 ...
STOI's user avatar
  • 275
-1 votes
4 answers
890 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 ...
CyanStar's user avatar
0 votes
3 answers
623 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 ...
Billy Bob's user avatar
0 votes
2 answers
141 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?
LazyReader's user avatar
0 votes
1 answer
82 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 ...
2012User's user avatar
  • 131
2 votes
1 answer
413 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:...
Yanick Salzmann's user avatar
0 votes
2 answers
92 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 ...
Andrestand's user avatar
1 vote
0 answers
98 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 ...
Kane's user avatar
  • 11
4 votes
3 answers
257 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? ...
Ardalan G.'s user avatar
3 votes
2 answers
512 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 ...
Bregalad's user avatar
  • 330
1 vote
0 answers
214 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?
curioso's user avatar
  • 31
2 votes
2 answers
569 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 ...
rozumir's user avatar
  • 133
0 votes
0 answers
410 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 ...
sanjihan's user avatar
  • 103
3 votes
1 answer
1k 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 ...
Luke Fairway's user avatar
0 votes
0 answers
84 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 ...
sba222's user avatar
  • 151
2 votes
0 answers
143 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 ...
BetterSense's user avatar
2 votes
0 answers
60 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 ...
ScottHartman's user avatar
1 vote
1 answer
58 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 ...
Alejandro Guzman's user avatar
1 vote
1 answer
30 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 ...
Yanick Salzmann's user avatar
1 vote
3 answers
656 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 ...
Teyash Arjun's user avatar
2 votes
0 answers
65 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 ...
John M.'s user avatar
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