Questions tagged [power-transmission]

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1answer
23 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 ...
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3answers
32 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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0answers
29 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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2answers
48 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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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" ...
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1answer
53 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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0answers
17 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 ...
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1answer
13 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}(\...
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1answer
32 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 ...
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3answers
50 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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2answers
37 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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2answers
183 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?...
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2answers
64 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 ...
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3answers
83 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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1answer
58 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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3answers
158 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: ...
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4answers
119 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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1answer
102 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?
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0answers
58 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 /...
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1answer
300 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 ...
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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 ...
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1answer
1k 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 ...
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1answer
198 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 ...
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0answers
105 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 ...
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2answers
1k 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?
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4answers
26k 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 ...
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1answer
782 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 ...
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4answers
152 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 ...
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2answers
300 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 ...
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3answers
141 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 ?
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4answers
207 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 ...
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1answer
307 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, ...
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2answers
978 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 ...