SuzukiSavage.com - Print Page

SuzukiSavage.com
/cgi-bin/YaBB.pl
General Category >> The Cafe >> Electric motor
/cgi-bin/YaBB.pl?num=1754000371

Message started by Serowbot on 07/31/25 at 15:19:31

Title: Electric motor
Post by Serowbot on 07/31/25 at 15:19:31

I don't need 750hp
Hope they make a 5lb one with 100HP :-?

A Tiny 29-Pound Electric Motor Just Beat Everyone in Power Density
https://www.popularmechanics.com/cars/hybrid-electric/a65490281/tiny-electric-motor/?utm_source=firefox-newtab-en-us

Yasa, a small British engineering company, built an over-730-horsepower beast that weighs just under 30 pounds.

http://https://i0.wp.com/electrek.co/wp-content/uploads/sites/3/2025/07/YASA-motor-axial-flux.jpg?w=640&quality=82&strip=all&ssl=1

Title: Re: Electric motor
Post by ohiomoto on 07/31/25 at 16:07:05

Crazy isn't it?!

I believe the electric motor will replace the combustion engine for transportation in the not so distant future.

I don't know, maybe another 10 years of development and 30-40 years on infrastructure?

Title: Re: Electric motor
Post by Eegore on 07/31/25 at 19:02:13

I've seen some DARPA prototypes that rip out some incredible torque, but the issue is the weight of the power source.

Batteries still weigh more than fuel believe it or not.

I'm going to put this out here and take it down if requested:

I bought an electric mower to see how it performed. I typically burn as a way to kill weeds and remain sane - but mowing is also part of the deal. I was offered the chance to retrofit my mower with a prototype electric drive as long as I collected data. It produced more power to weight than a gas engine of near-identical mass.

Given the civilian market for electric mowers I would not have believed this was a current outcome, but I can't argue with the numbers. Electric engines have a potential the consumer market has not seen - yet, but given we can actually build a non-reactive infrastructure I too believe it will replace the combustion engine for most functions.

Title: Re: Electric motor
Post by Tocsik on 07/31/25 at 19:28:30

It's the power source that concerns me. The way the planet is getting stripped of lithium and other minerals seems pretty destructive.

Title: Re: Electric motor
Post by Eegore on 07/31/25 at 20:33:12

It's the power source that concerns me. The way the planet is getting stripped of lithium and other minerals seems pretty destructive.

I think it's because we are more aware of it due to modern technology - AKA the internet.

During the industrial revolution had we the knowledge of fossil fuel extraction impacts, maybe we would be thinking the same thing then: "I'm all for that newfangled combustion engine, but I sure am concerned about the availability of fossil power."

Maybe.

Title: Re: Electric motor
Post by Ruttly on 07/31/25 at 22:51:04

Not fond of electric , I do love my gasoline powered anything over a battery. It’s the new , next Gen stuff and as an old fart it’s my duty to resist , now I’m a rebel with a cause ! Electric horsepower is incredible but nothing replaces my tracker with a big bore thumper , with some mid 90’s octane rated fuel. I would learn how to make my own fuel if need be , it’s all about my Carbon Footprint and SPM’s (Smiles Per Mile). 8-)

Title: Re: Electric motor
Post by Axman88 on 08/01/25 at 08:30:42

5676747C6176130 wrote:

Title: Re: Electric motor
Post by Eegore on 08/01/25 at 09:43:47

To make a reasonable comparison, one would have to:
- Add the mass of the fuel tank and enough fuel to give the desired power output and run time to the mass of the internal combustion engine.
- Add the mass of the batteries, battery management system, and any required onboard charging components to the mass of the electric motor, again, profiding for the desired power output and run time.
- It's not really fair to make calculations based on the incredibly high torque that is available from an electric motor at zero rpm. We should be comparing USABLE power outputs, at normal blade speeds.
- From your description, I'd assume that the vehicle itself was liquid fuel powered, and only the mower function was electric powered? How does the picture look when everything on the vehicle is electric powered?

Considering that the best average power density of current Lithium ion battery technology is something like 300 Wh/kg, (watt-hour per kilogram) and gasoline offers something like 12,000 Wh/kg, I'm pretty skeptical of your claim that any electrical application offers a better power to weight ratio when the full picture is being considered. Please share the details.

I agree.

So basically all they are interested in is the runtimes at full power while under load - meaning mowing the field of weeds.

This is a push mower with a prototype engine. All I can say is the gas powered push mower of near identical weight can run about 2 hours, these are in I believe 15 minute intervals.

The electric mower can't operate as long, but it has 6-7 lb-ft of torque which is unheard of from my understanding. So basically I am meaning to say the general weight of the device on the mower frame + battery puts out the same or higher amount of torque.

Title: Re: Electric motor
Post by ohiomoto on 08/01/25 at 18:48:37

Of course power supply an issue right now, but that is likely to change dramatically over the next decade or two. After that it's infrastructure.

I'm just speculating of course.