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Making sound through a helical gear sounds inefficient. It will lead to higher waste of energy.
Electrical --> Mechanical --> sound + energy wasted as heat due to friction.
To me added some electronic component like a speaker looks a more efficient approach.
Quote:
Originally Posted by ajayc123
(Post 5362940)
Making sound through a helical gear sounds inefficient. It will lead to higher waste of energy.
Electrical --> Mechanical --> sound + energy wasted as heat due to friction.
To me added some electronic component like a speaker looks a more efficient approach.
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EVs do have reduction gear, not sure how a gearset makes noise. EVs like KONA already come with a system which make sounds from the speakers at low speed called VESS.
Quote:
Originally Posted by ajayc123
(Post 5363131)
Please see the previous post where a suggestion for introducing a helical gear in EVs has been made by the government.
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Yes, I am refering to the original post about helical gear.
Quote:
Originally Posted by SKC-auto
(Post 5363125)
EVs do have reduction gear, not sure how a gearset makes noise. EVs like KONA already come with a system which make sounds from the speakers at low speed called VESS.
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Please see the previous post where a suggestion for introducing a helical gear in EVs has been made by the government.
Quote:
Once these standards are implemented, EV manufacturers are expected to introduce helical gear pair primary transmissions in their offerings to produce a whining note
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Not sure if it has been posted before:
In a recent US congressional hearing, there was a discussion about EV's.
A EV being charged can in the initial 80% charging, use up as much as 25-50 Times the current drawn by a running refrigerator. Now even one car being charged in a house each night, multiplied by the number of houses doing the charging at night would really load up the grid.
Comparing with AC, the charging car uses four times the average current drawn by the AC in the average US household
The grid is not being upgraded fast enough, and the situation would be like yesterday's grid with tomorrow's cars. It is not going to hold up well. If Biden's non-binding exec order to have 50% of all news cars being sold be EV's by 2030, US is quite likely to see rolling black-outs and brown outs.
Material costs for EVs is up 75 percent from 2020, 3x higher than ICE vehicles.
Quote:
High inflation, soaring energy cost, as well as shortage of aluminum and semiconductor parts have been driving car prices upwards since the pandemic-hit 2020. According to a latest study by financial advisory and consulting firm AlixPartners, increase in material cost for battery electric vehicles (EVs) models have outpaced internal combustion engine (ICE) models.
The firm estimates that as of September 2022, the average material cost for an EV is now USD 5,076. The figure is nearly 75 percent higher than the same period in 2020.
Material cost for combustion engine models (including hybrids) have also seen a steep increase, but not as much as EVs, rising 25 percent from USD 1,475 in 2020 to USD 1,851.
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Link
Regarding EVs and grid. Quote from the article below:
https://www.scientificamerican.com/a...reak-the-grid/ Quote:
In California—the national leader in electric cars with more than 1 million plug-in vehicles—EV charging currently accounts for less than 1 percent of the grid’s total load during peak hours. In 2030, when the number of EVs in California is expected to surpass 5 million, charging is projected to account for less than 5 percent of that load, said Buckley, who described it as a “small amount” of added demand.
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Developing countries fall behind :
Whilst there are notable differences in EV adoption rates between markets in Europe and the US, the gap between developed, developing, and poor nations is even more striking in comparison.
For instance, while the market share of Battery Electric Vehicles (BEV) surpassed 10% in China, Europe, and Korea in Q3 2022, it didn’t even reach 1% in regions such as Latin America and Russia. This disparity is the consequence of the income gap, which is reflected in the infrastructure, the competitiveness of the industry, and lower levels of consumer awareness.
Developing and poor nations now represent more than one fifth of global vehicle sales.
Link
I couldn't find more appropriate thread than this to share this info:
Switzerland banning EVs (temporarily?) https://www.carblogindia.com/switzer...-blackout/amp/ Quote:
It is ironic that countries focusing so much on sustainable mobility are considering banning EVs.
Switzerland is facing severe power issues this winter due to a lack of production in its neighbouring countries.
It imports power from France and Germany who are also struggling with enough power to last this winter
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Switzerland will ban the use of electric cars for 'non-essential' journeys if the country runs out of energy this winter, the government has announced.
https://www.dailymail.co.uk/news/art...shortages.html
If this is the case for a developed nation, what about developing economies. Yes, this most likely an outcome of the current energy crisis, but it does make one wonder about a developing nation like ours which struggles to provide uninterrupted energy supply to households even during normal times!
The world is coming to terms with the ill effects of depending on a mad dictator and his oil wealth. Europe will likely suffer this year and next year but they are moving faster towards renewables and battery storage.
There is an 30% increase in renewables installation across Europe compared to the actual estimate for this year, Europeans are not worried about climate change they are worried about this mad dictator.
India should also build renewables faster and avoid dependence on the Middle eastern oil money dictators. Renewables not only avoid strategic dependence on these dictators, they are also cheaper, better for climate and reliable for a developing country like ours.
Two different types of Europe when it is about the adoption of EVs. The Northern is ahead thanks to a better infrastructure, more incentives, and higher income:
While the pure electric cars made up 15% of Northern Europe passenger car sales, they barely counted for 4% in their southern neighbours.
A report by S&P Global Ratings.
EV domestic take up slow.
- Sales of EVs more than doubled last year in the country. This was, however, off a low base. EV sales represented less than 2% of the total light-vehicle sales.
- No Indian company is likely to have a meaningful global share of electric vehicles
in the foreseeable future
-Asia is set to keep its place as the world's biggest producer of, and market for electric vehicles (EVs), EV batteries, and EV battery materials and the continent will be at the centre of the EV era
- 90 per cent of the EVs in India are in the two- and three-wheeler segment.
-While there is strong growth potential, the development of adequate charging infrastructure will be the key to EV adoption.
-Given the slow take-up of EV domestically, no Indian company is likely to have a meaningful global share of EVs in the foreseeable future.
Link
Are Auto companies pushing back the EPA's push for EV's ?
Quote:
Multinational carmakers Stellantis and Toyota criticized the U.S. Environmental Protection Agency’s (EPA) “overly optimistic” plans to promote vehicle electrification, which they warn is unrealistic and gives rise to a host of issues, including an increase in mining.
On April 12, the EPA announced new rules aimed at cutting down greenhouse gasses and other pollutants in motor vehicle emissions. The agency estimated that approving the rules will result in 67 percent of new passenger vehicles and light trucks being electric vehicles (EV) by 2032. In addition, 50 percent of buses, 35 percent of short-haul freight tractors, and 25 percent of long-haul freight tractors are also estimated to become electric.
In comments filed with the federal government, Toyota and Stellantis called EPA expectations “overly optimistic.”
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https://www.theepochtimes.com/major-...vCa7TtKpppIDVx
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And I do agree with the direction of what's said in the article.
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