Alpo Posted November 19, 2019 Share Posted November 19, 2019 The guy in the story is driving a Tesla. He hit the ignition and the engine vibrated into life. That sentence pulled me out of the story, since I would expect an electric car "motor" (motors are electrical, engines are mechanical) would not vibrate. Do they? Link to comment Share on other sites More sharing options...
Subdeacon Joe Posted November 19, 2019 Share Posted November 19, 2019 More exactly, a motor is anything that provides motive force. And engine has moving parts and provides motive force. Take for example model rockets. We usually call the solid propellant propulsion system an "engine" but it is actually a motor because it has no moving parts. Re the Tesla. I have ridden in one owned by a coworker. There is no "igniton," just an ON/OFF switch. There was no noticeable vibration. Link to comment Share on other sites More sharing options...
Yul Lose Posted November 19, 2019 Share Posted November 19, 2019 No on the engine and vibration. The Tesla’s I’ve been in have virtually no road noise either, even at over 100mph. Link to comment Share on other sites More sharing options...
Rooster Cognizant Posted November 19, 2019 Share Posted November 19, 2019 Same as above, really no noise, no vibration. Link to comment Share on other sites More sharing options...
Sedalia Dave Posted November 19, 2019 Share Posted November 19, 2019 The drive motor(s) don't start turning until the driver shifts into gear and pushes down on the accelerator pedal. The drive motors are big DC servo motors. Speed of the motor is controlled via Pulse Width Modulation. Because the motors have very tight tolerances and can turn at very high RPMs, they are well balanced and do not have any appreciable vibration. Almost all of the vibraton while in motion comes from the tires and wheels and not the drive motors. All the ignition switch/botton does is apply power to the computers that control everything. Link to comment Share on other sites More sharing options...
Black RZR Posted November 22, 2019 Share Posted November 22, 2019 Electric motors in cars...what's the fun in that? Nothing beats the sound and feel of a V8 especially with 1000+ hp . Link to comment Share on other sites More sharing options...
Still hand Bill Posted November 22, 2019 Share Posted November 22, 2019 When turned on my car boots up and dash/radio come on. It makes noise as it’s doing it to let you know it turned on. Then when you put it in drive it makes noise up to about 20 mph per federal law. It’s a white noise and quite annoying, but no way to turn it off. electric cars still have road noise and wind noise. They also have some gear whine as there is a gearbox. They are not silent. I have not ridden in a tesla, but I assume the higher end s and x are quieter. Link to comment Share on other sites More sharing options...
Noz Posted November 22, 2019 Share Posted November 22, 2019 On 11/19/2019 at 2:23 PM, Sedalia Dave said: The drive motor(s) don't start turning until the driver shifts into gear and pushes down on the accelerator pedal. The drive motors are big DC servo motors. Speed of the motor is controlled via Pulse Width Modulation. Because the motors have very tight tolerances and can turn at very high RPMs, they are well balanced and do not have any appreciable vibration. Almost all of the vibraton while in motion comes from the tires and wheels and not the drive motors. All the ignition switch/botton does is apply power to the computers that control everything. At speeds in excess of 100mph part of the vibration is the passenger beating on his door, wanting out. Link to comment Share on other sites More sharing options...
Painted Mohawk SASS 77785 Posted November 22, 2019 Share Posted November 22, 2019 Is it true that to replace a battery costs a small fortune ? Link to comment Share on other sites More sharing options...
Sedalia Dave Posted November 22, 2019 Share Posted November 22, 2019 1 minute ago, Painted Mohawk SASS 77785 said: Is it true that to replace a battery costs a small fortune ? Given that all EV and Hybrids vehicles sold in the US have at least a 100,000 mile warranty, by the time it needs replacing it is usually more than the car is worth. How Much is a Replacement Chevy Bolt EV Electric Car Battery What’s a Fair Price For A Toyota Prius Battery Replacement And What Are the Options? My Hybrid Battery Died - Should I Repair or Suffer Replacement Costs? Link to comment Share on other sites More sharing options...
Painted Mohawk SASS 77785 Posted November 22, 2019 Share Posted November 22, 2019 14 minutes ago, Sedalia Dave said: Given that all EV and Hybrids vehicles sold in the US have at least a 100,000 mile warranty, by the time it needs replacing it is usually more than the car is worth. How Much is a Replacement Chevy Bolt EV Electric Car Battery What’s a Fair Price For A Toyota Prius Battery Replacement And What Are the Options? My Hybrid Battery Died - Should I Repair or Suffer Replacement Costs? Howdy SD.....so the car is virtually a throw away item...what a scam for a replacement battery..I saw in the paper here the other day where a guys battery failed at 100,00 km [ only 62,00 mile ]..he was quoted $ 30,000AU for another. !!!!!!!!!!!!!1 Link to comment Share on other sites More sharing options...
Fence Cutter Posted November 22, 2019 Share Posted November 22, 2019 The electric cars that I've driven had a steady whine and rolled of the road reality easy...... Link to comment Share on other sites More sharing options...
Yul Lose Posted November 22, 2019 Share Posted November 22, 2019 7 hours ago, Still hand Bill said: When turned on my car boots up and dash/radio come on. It makes noise as it’s doing it to let you know it turned on. Then when you put it in drive it makes noise up to about 20 mph per federal law. It’s a white noise and quite annoying, but no way to turn it off. electric cars still have road noise and wind noise. They also have some gear whine as there is a gearbox. They are not silent. I have not ridden in a tesla, but I assume the higher end s and x are quieter. A Tesla has no gearbox and road noise is nearly non existent. Link to comment Share on other sites More sharing options...
Yul Lose Posted November 22, 2019 Share Posted November 22, 2019 5 hours ago, Painted Mohawk SASS 77785 said: Is it true that to replace a battery costs a small fortune ? My son in law that’s three years older than me bought a Honda Civic hybrid back when they first came out. The batteries had a defect and were replaced free of charge at around 60,000 miles and that was about 230,000 miles ago. He still drives the car though not as much because he’s retired now. My wife had a Prius hybrid with over 200,00 miles and the only battery that was ever changed was the 12 volt battery that ran the starter and such. Link to comment Share on other sites More sharing options...
Widder, SASS #59054 Posted November 22, 2019 Share Posted November 22, 2019 Fence Cutter, You beat me to it. We (4 young boys in the family) had the same (or nearly the same) set up. Each year for Christmas, we would get a few more pieces of track. Eventually, we had a track that covered an entire ping-pong table with curves and even a circle up & down section. Impressive to say the least. There are times I can still sense the smell of the oil we used as it would 'burn' (evaporate) when the cars flew around the track. ..........Widder Link to comment Share on other sites More sharing options...
Still hand Bill Posted November 22, 2019 Share Posted November 22, 2019 1 hour ago, Yul Lose said: A Tesla has no gearbox and road noise is nearly non existent. All electric cars have a gearbox of some sort. Not a transmission like we are used to, but they don’t run the motor directly attached to the wheel, so there are gears. The Tesla uses big helical cut gears instead of straight cut gears to reduce noise. With enough insulation you probably don’t hear the road noise or gear noise, but it’s still there. Just like riding is a top level bmw, they are very quiet. Link to comment Share on other sites More sharing options...
Yul Lose Posted November 22, 2019 Share Posted November 22, 2019 3 minutes ago, Still hand Bill said: All electric cars have a gearbox of some sort. Not a transmission like we are used to, but they don’t run the motor directly attached to the wheel, so there are gears. The Tesla uses big helical cut gears instead of straight cut gears to reduce noise. With enough insulation you probably don’t hear the road noise or gear noise, but it’s still there. Just like riding is a top level bmw, they are very quiet. Gearbox/transmission semantics I suppose. The Tesla has no transmission but you are correct there is a helical gear system at each wheel. They are incredibly quiet. Link to comment Share on other sites More sharing options...
Finagler 6853 Life Posted November 22, 2019 Share Posted November 22, 2019 Interesting factoid, what they don't tell you about electric cars is that they operate on high voltage. It takes special training on the part of rescue workers to know where and how to cut you out of one so as to not get electrocuted. If the rescue team were to go in and start hacking around with the jaws of life like they do on engine powered cars, they could hit a live wire(s). You don't want to be messing around under the hood of an electric car. Link to comment Share on other sites More sharing options...
Rooster Cognizant Posted November 22, 2019 Share Posted November 22, 2019 Finagler is correct. Plus, how you put them out during a car fire is different, or rather, there is risk of the fire starting up again. More information and training that hopefully gets shared with fire departments. Link to comment Share on other sites More sharing options...
Yul Lose Posted November 22, 2019 Share Posted November 22, 2019 4 minutes ago, Finagler 6853 Life said: Interesting factoid, what they don't tell you about electric cars is that they operate on high voltage. It takes special training on the part of rescue workers to know where and how to cut you out of one so as to not get electrocuted. If the rescue team were to go in and start hacking around with the jaws of life like they do on engine powered cars, they could hit a live wire(s). You don't want to be messing around under the hood of an electric car. Under the hood is a “frunk”, frontloading trunk. In that trunk is a high voltage wire that rescue crews cut to safely access the rest of the car. Link to comment Share on other sites More sharing options...
Still hand Bill Posted November 22, 2019 Share Posted November 22, 2019 The high voltage line to cut is marked on the car. On my Bolt it’s under the hood and the volt is in the trunk. It’s about 500v and they do that to reduce the current required to achieve the needed power levels. V=Ir. Power = Volt x Amps. supposedly the semi is around 800v. Link to comment Share on other sites More sharing options...
Finagler 6853 Life Posted November 22, 2019 Share Posted November 22, 2019 5 minutes ago, Yul Lose said: Under the hood is a “frunk”, frontloading trunk. In that trunk is a high voltage wire that rescue crews cut to safely access the rest of the car. Cool pics. I had not seen what the storage space looks like. I was told the high voltage thing by one of our engineers years ago when the Prius first came out and the wires were not specifically identified. I've been wondering how the people in Kalifornia have been liking their electric cars with the rolling black outs. How do they re-charge their cars? Link to comment Share on other sites More sharing options...
Yul Lose Posted November 22, 2019 Share Posted November 22, 2019 1 minute ago, Finagler 6853 Life said: Cool pics. I had not seen what the storage space looks like. I was told the high voltage thing by one of our engineers years ago when the Prius first came out and the wires were not specifically identified. I've been wondering how the people in Kalifornia have been liking their electric cars with the rolling black outs. How do they re-charge their cars? Most electric car owners that I know have a back up “evil” fossil fuels car. My granddaughter charges her car at work, they have a huge solar array and over 100 charging stations and they don’t charge for it. She doesn’t even have a charge station at her home. She better hope she never loses her job. Link to comment Share on other sites More sharing options...
Fence Cutter Posted November 22, 2019 Share Posted November 22, 2019 4 hours ago, Widder, SASS #59054 said: Fence Cutter, You beat me to it. We (4 young boys in the family) had the same (or nearly the same) set up. Each year for Christmas, we would get a few more pieces of track. Eventually, we had a track that covered an entire ping-pong table with curves and even a circle up & down section. Impressive to say the least. There are times I can still sense the smell of the oil we used as it would 'burn' (evaporate) when the cars flew around the track. ..........Widder The good 'ol days when a guy really looked forward to Christmas ......... Link to comment Share on other sites More sharing options...
Utah Bob #35998 Posted November 22, 2019 Share Posted November 22, 2019 3 hours ago, Finagler 6853 Life said: Cool pics. I had not seen what the storage space looks like. I was told the high voltage thing by one of our engineers years ago when the Prius first came out and the wires were not specifically identified. I've been wondering how the people in Kalifornia have been liking their electric cars with the rolling black outs. How do they re-charge their cars? Honda generator in the trunk? Link to comment Share on other sites More sharing options...
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