MAC 10T Speed

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Ford Prefect   1 W

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Joined: Jan 10 2019 7:41am
Location: Wuppertal, EU

MAC 10T Speed

Post by Ford Prefect » Aug 04 2019 1:19am

Hello E-S,

after I abandoned my "250W Tow Truck" for the moment ( viewtopic.php?f=3&t=99529 ) I am going to build a heavy but reliable commuter. The wife is going to pull the kids with her BoschBike.

I am somehow inclined to the MAC, since it has a huge fan base, and I get spare parts in the future. There is one thing I don't understand:

When configuring at em3ev the winds have approximate speeds: 10T is supposed to run 40kph at 48V (13S?) and 26". Which should result in something like 32 kph at 36V (10S) and 26", which would be rather ideal.

When I run the same system in the grin motor simulator I get 40kph at 36V (10S) and 26".
In the simulator the 12T runs about 30kph at 10S and 26".

What am I not getting here?
Most ES-Posters recommend both sites so I trust both. I guess in this case one of them has an error?
Which figure is correct?

Thanks,
Phil
The fundamental laws of thermodynamics will place fixed limits on technological innovation and human advancement.

How would you react if I said that I'm not from Guildford after all, but from a small planet somewhere in the vicinity of Betelgeuse?

district9prawn   100 W

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Location: Sydney

Re: MAC 10T Speed

Post by district9prawn » Aug 04 2019 1:42am

The 40 kph given by the grin simulator is the maximum speed. No torque is produced at this speed. 32 kph is a more realistic top speed on flat ground.
Neu 8057 6kW left hand drive hardtail with 18 fet Vesc: viewtopic.php?f=6&t=96754

Ford Prefect   1 W

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Joined: Jan 10 2019 7:41am
Location: Wuppertal, EU

Re: MAC 10T Speed

Post by Ford Prefect » Aug 04 2019 2:07am

Ah, OK. This is a theory vs reality thing.
Thanks!
The fundamental laws of thermodynamics will place fixed limits on technological innovation and human advancement.

How would you react if I said that I'm not from Guildford after all, but from a small planet somewhere in the vicinity of Betelgeuse?

Jon NCal   1 kW

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Joined: Jun 15 2015 3:59pm
Location: Mendocino, California

Re: MAC 10T Speed

Post by Jon NCal » Aug 04 2019 9:04am

The simulator is supposed to be a real world simulation. I get 32.7kph with 10T on 36v:
https://www.ebikes.ca/tools/simulator.h ... 0&cont=C20

torestabell   1 mW

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Re: MAC 10T Speed

Post by torestabell » Aug 05 2019 3:13am

Does the simulator say speed at 48V" or "speed at a fully charged 48V battery (14 in series battery is often referred to as "48V"..)"
The latter gives 58.8 Volt fully charged, a lot more than 48 Volts, actually a 22 percent increase. Just a thought.

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NCC1941   1 W

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Location: Arizona

Re: MAC 10T Speed

Post by NCC1941 » Aug 05 2019 3:26am

The simulator seems to use a 75%-ish SOC when selecting a pack from the dropdown list. The 48v packs are simulated as around 50v at rest (and it simulates voltage sag, so actual voltage under load is lower, closer to the nominal voltage).

Also, the simulator correctly distinguishes between nominal 48v (13s) and 52v (14s) packs, and has a few examples of each to use in the simulations. You can also run with a custom pack / SOC by selecting your own open-circuit voltage, capacity, and internal resistance for it to use in the simulation.
"The Kitchen Sink" - 2016 Surly ECR 29", 2WD Grin All-Axle + 9C RH212, 2x Phaserunner, 52v50Ah EM3ev (Rolling WIP)
"Novara Barrow eBike" - 2016 Novara Barrow Bike, Luna BBS02, 52v28Ah EM3ev (Retired)

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