# Questions tagged [power-transmission]

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46 views

### 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 ...
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 ...
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 ...
• 103
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 ...
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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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
• 101
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 ...
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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 ...
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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 ...
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 ...
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1 vote
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 ...
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 ...
• 109
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 ...
1 vote
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 ...
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)
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 ...
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 ...
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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 ...
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 ...
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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 ...
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 ...
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 ...
1 vote
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 ...
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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 ...
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1 vote
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 ...
• 265
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 ...
• 275
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 ...
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 ...
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?
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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 ...
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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:...
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 ...
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1 vote
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 ...
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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? ...
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 ...
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1 vote
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?
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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 ...
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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 ...
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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 ...
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 ...
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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 ...
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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 ...
1 vote
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 ...
1 vote
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 ...
1 vote
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 ...
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