[Cad] [motors, power ee, & evs] (Siemens) Electric aircraft: World-record (50kg:260 kW contiunuous) electric motor makes first flight. also, electric dirigibles from 1885?!

Tue Jul 12 04:46:15 EDT 2016

sweet pdf, though lol loweffort response :p yes ofc batteries

I believe the PDF is 2012 (why oh why don't people put date writtens or at
least year written in their documents)

The few electric motors available toda*y for aircraft propulsion *have a
> power output of *less than 100 kW*. Large electric motors are also used
> in trains, ships and submarines, but here the mass is less important. Today
> it seems to be possible to build electric motors having a *specific mass
> of about 2 to 4 kW/kg*. This compares favorably with the specific mass of
> larger turboshaft and turbofan engines at cruise power (see Figure 13 and
> Figure 14). *Future developments* may extend the range of electric motors
> to values of *up to 8 kW/kg*, but there is a strong need for the
> development of lightweight electric motors, specifically designed for
> application in aircraft.
>

so this gives context to why siemen's motor is cool.

260 kW / 50 kg =* 5.2 @ 260 kW* or roughly *orange* circle:

[image: Inline image 1]
pg 12

*does anyone know what the comparable previous weight would be before this
motor? *this one is 50kg &  if this is a lot less than before, it's just
another notch in reducing weight to make weightspace for battery packs
perhaps.

Range sensitivities Equation 11 shows that in order to achieve maximum
> range for a given aircraft mass A lightweight aircraft is more sensible to
> a change in mass than a heavy aircraft.

I love their *"let's think through how we'd make this work" thought
experiment* section:

Applying this simulation model to a specific aircraft allows determining
> the possible performance and the technology improvements required to
> achieve the desired results

The range of the original aircraft with 32 passengers is about 1200 km.
> With a reduced payload of 28 passengers the maximum range is approximately
> 2200 km

Using current (2012) technology this aircraft would reach a range of 202
> km. The flight time would be about 40 minutes. Cruise speed would be about
> 300 km/h. If an additional reserve of 30 minutes for holding at the
> destination airport would have to be considered, the practical range would
> drop to 50 km.

The next modification would reduce the empty mass of the aircraft by 20%.
> This would require introducing extreme lightweight design features

This step improves the battery technology by doubling the mass specific
> energy * E . *Such an improvement is quite well possible with future
> development of Li-S battery systems within the next 15 years*. This
> modification would double the range to 711 km so that it at least comes
> into the order of the kerosene based aircraft. Nevertheless, there is still
> a factor of 3 in range missing. In order to achieve the range of the
> original aircraft, the battery technology would have to be improved by this
> factor, i.e. a factor of 6 compared to todays (2012) technology.

Furthermore new infrastructure to replace and recharge the batteries on
> each airport would be required to make such an aircraft feasible

Comparing the payload-range characteristics of the baseline turboprop
> aircraft and the battery powered electric aircraft shows that trading
> payload for fuel respectively battery has a very beneficial effect in case
> of kerosene because of its high specific energy

> If, on the other hand, the final extremely modified aircraft 328-LBME2
> would be equipped with a current turbo-prop engine, its fuel consumption
> would be as low as 1.5 liters per passenger per 100 km, which is about half
> that of the baseline aircraft.

(This last stat is mostly due to how light and dragless the author's
thought-experiment is, I think.)

Thanks,
--Nancy

~~~
my personal blog <http://www.orangenarwhals.com>, orangenarwhals

On Tue, Jul 12, 2016 at 2:48 AM, Lochie Ferrier <lochieferrier at gmail.com>
wrote:

> The batteries though. The batteries are what makes it super hard
> <http://www.mh-aerotools.de/company/paper_14/MP-AVT-209-09.pdf>.
>
> On Tue, 12 Jul 2016 at 16:31 Nancy Ouyang <nancy.ouyang at gmail.com> wrote:
>
>> www.siemens.com/press/electric-aircraft
>>
>> *"This is the first time that an electric aircraft in
>>> the quarter-megawatt performance class has flown."*
>>
>>
>> https://www.youtube.com/watch?v=fiu8TFnXYFY
>>
>> In a big leap for the electrification of aviation, an Extra Aircraft
>>> aerobatic plane performed its maiden flight with an electric powertrain.
>>> The crucial component was a world record motor from Siemens. Weighing a
>>> mere 50 kilograms, the motor has an output of 260 kilowatts, resulting in
>>> an unparalleled power-to-weight ratio.
>>
>>
>> Datasheet:
>> http://www.siemens.com/press/pool/de/feature/2015/corporate/2015-03-electromotor/factsheet-erstflug-weltrekordmotor-d.pdf
>>
>>
>>
>> https://transportevolved.com/2016/07/08/siemens-showcases-brand-new-electric-motor-thats-super-light-super-powerful-and-perfect-for-electric-airplanes/
>>
>>> Of course, electric motors have long been used in model planes, but
>>> their use outside the 1:14th scale aeromodelling arena has been
>>> somewhat limited due to the mechanics of making a sufficiently large,
>>> powerful, & lightweight electric motor. And while we’ve seen some very
>>> successful electric planes take to the sky, most have been custom-made,
>>> super-lightweight affairs which while impressive, have yet to make their
>>> mark on a wider scale.
>>
>>
>> Many of the benefits of electric motive power for aircraft are ones that
>>> any EV driver will be familiar with: quieter, lower maintenance, greater
>>> efficiency. Benefits that are shared with the community too in this case –
>>> as with increasing air travel areas around airports have become
>>> increasingly polluted – both by noise and by noxious residues from burning
>>> fossil fuels.
>>>
>>
>>
>>> But there are also other benefits that are deeply exciting for
>>> aeronautical engineers and pilots.
>>
>>
>>
>>
>>> Unlike fossil fuel powered engines, electric motors really don’t care
>>> which way is up. They operate the same upside-down as they do the right way
>>> up — they don’t stall and fuss with fuelling issues when you turn them
>>> over. They also perform the same at 40,000 feet as they do at 4 feet.
>>> Traditional engines require complex mixture and timing adjustments to keep
>>> them performing well in the thin atmosphere in which they spend much of
>>> their lives.
>>
>>
>> about the airplane,
>>
>>> Based on a thoroughly modern, but not deeply exceptional structure –
>>> with a mixture of a steel fuselage and carbon fibre wings, the Extra is
>>> itself a popular aerobatic model
>>
>>
>>
>>> The Extra 330LE, which weighs nearly 1,000 kilograms, serves as a flying
>>> test bed for the new propulsion system. As an aerobatic airplane, it's
>>> particularly well suited for taking the components to their limits, testing
>>> them and enhancing their design.
>>
>>
>> the future
>>
>>> Electric drives are scalable, and Siemens and Airbus will be using the
>>> record-setting motor as a basis for developing regional airliners powered
>>> by hybrid-electric propulsion systems. "By 2030, we expect to see initial
>>> aircraft with up to 100 passengers and a range of around 1,000 kilometers,"
>>> explained Anton.
>>
>>
>>
>> I love this anecdote about intelligent analysis tools in CAD. (*hi
>> cad-discuss, that's why you're cc'd :]* )
>>
>> The end-shield for the motor, for example, was analyzed using a *software
>>> package* that divided the component into over 100,000 elements, each of
>>> which was individually further stress-analyzed and subject to*
>>> iterative improvement loops.* Eventually, the custom software spat out
>>> a filigree structure that weighs 4.9kg instead of the 10.5kg from the
>>> previous design.
>>
>>
>> more about the motor
>> http://phys.org/news/2015-04-world-record-electric-motor-aircraft.html
>>
>> Siemens researchers have developed a new type of electric motor that,
>>> with a weight of just 50 kilograms, delivers a* continuous output of
>>> about 260 kilowatts – five times more than comparable drive systems.*
>>> The motor has been *specially designed* for use in aircraft. Thanks to
>>> its record-setting power-to-weight ratio, larger aircraft with *takeoff
>>> weights of up to two tons* will now be able to* use electric drives for
>>> the first time.*
>>>
>>
>>
>>> New simulation techniques and sophisticated lightweight construction
>>> enabled the drive system to achieve a unique weight-to-performance ratio of
>>> five kilowatts (kW) per kilogram (kg). *The electric motors of
>>> comparable strength that are used in industrial applications deliver less
>>> than one kW per kg. The performance of the drive systems used in electric
>>> vehicles is about two kW per kg.* Since the new motor delivers its
>>> record-setting performance at rotational speeds of just* 2,500
>>> revolutions per minute, it can drive propellers directly, without the use
>>> of a transmission.*
>>>
>>> In the next step, the Siemens researchers will boost output further.
>>> "We're convinced that the use of hybrid-electric drives in regional
>>> airliners with 50 to 100 passengers is a real medium-term possibility,"
>>> said Anton.
>>
>>
>>
>> this might be what the motor looks like? not sure
>> https://youtu.be/j3cNLsN-eCM?t=31s
>> [image: Inline image 1]
>>
>>
>>
>> about the Siemens and electric dirigibles (?!)
>>
>>>
>>
>> Siemens current motor is sufficient to power a small 4-seater aircraft by
>>> itself. Indeed, it would be “quite racy” suggest Siemens in that
>>> application. And Siemens is keen to point out that the motor is *nearing
>>> the power requirements for small regional airliners. *Of course if
>>> anyone would know about aeronautical electric motors it really ought to be
>>> Siemens, given that it was its electric motor that (back in 1881) powered
>>> the *first electric dirigible*
>>> <https://archive.org/details/lesballonsdirig00tissgoog>*.*
>>
>>
>> Also check out this amazing scan of an* 1885 book about electric
>> dirigibles*. (archive.org's ebook software is on-point!)
>> https://archive.org/details/lesballonsdirig00tissgoog
>>
>>> Dirigibles: application of electricity to air navigation
>>
>> by Gaston Tissandier
>>> Published 1885
>>> Book digitized by Google from the library of the University of Michigan
>>> and uploaded to the Internet Archive by user tpb.
>>
>>
>>
>> Thanks,
>> --Nancy
>>
>>    -
>>
>>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://mailman.mit.edu/pipermail/cad-rg/attachments/20160712/1584265d/attachment-0001.html
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image.png
Type: image/png
Size: 666317 bytes
Desc: not available
Url : http://mailman.mit.edu/pipermail/cad-rg/attachments/20160712/1584265d/attachment-0002.png
-------------- next part --------------
A non-text attachment was scrubbed...
Name: powerweightratio_electricairplanes_graph.png
Type: image/png
Size: 50999 bytes
Desc: not available
Url : http://mailman.mit.edu/pipermail/cad-rg/attachments/20160712/1584265d/attachment-0003.png