Six years on...................
http://leva-eu.com/freeflow-technologie ... m-funding/
Search found 10631 matches
- Dec 01 2020 3:22am
- Forum: Motor Technology
- Topic: FreeFlow Technologies
- Replies: 24
- Views: 2996
- Mar 02 2020 5:51pm
- Forum: General Discussion
- Topic: Fatal ebike crash trial
- Replies: 31
- Views: 3338
- Mar 02 2020 1:29pm
- Forum: General Discussion
- Topic: Fatal ebike crash trial
- Replies: 31
- Views: 3338
- Feb 27 2020 4:35am
- Forum: General Discussion
- Topic: Fatal ebike crash trial
- Replies: 31
- Views: 3338
Re: Fatal ebike crash trial
Does England have the legal concept of contributory negligence, where a percentage of the fault can be assigned to the respective parties, or is it all or nothing? Yes, it does. Some aspects of its use have been quite contraversial.... See: http://thecyclingsilk.blogspot.com/2014/12/inquest-into-de...
- Feb 26 2020 5:00pm
- Forum: General Discussion
- Topic: Fatal ebike crash trial
- Replies: 31
- Views: 3338
- Nov 14 2019 4:43am
- Forum: EBike General Discussion
- Topic: Locking freewheel?
- Replies: 6
- Views: 1579
Re: Locking freewheel?
Interesting. BSA made a shiftable fixed/free 2 speed hub called the 'DP'. There were cables controls to both sides of the hub.Balmorhea wrote: The late Val Kleitz of Seattle used to modify antique Bendix 2-speed hubs to function as shiftable fixed/free hubs. That's now a few degrees removed from practical.
- Nov 14 2019 4:05am
- Forum: EBike General Discussion
- Topic: Locking freewheel?
- Replies: 6
- Views: 1579
Re: Locking freewheel?
It was called the 'Fix-Free' drive. You won't find anything about it online though... I still have the leaflet that came with mine.
- Oct 02 2019 5:11pm
- Forum: EBike Non-hub Motor Drives
- Topic: 2 speed (could be auto) gearbox
- Replies: 39
- Views: 6914
- Aug 19 2019 4:18pm
- Forum: General Discussion
- Topic: Go Cedric!
- Replies: 14
- Views: 1640
Re: Go Cedric!
Some background for those not up to speed....:
- Aug 19 2019 3:49pm
- Forum: General Discussion
- Topic: Go Cedric!
- Replies: 14
- Views: 1640
- Apr 17 2019 12:22pm
- Forum: General Discussion
- Topic: Offroad biker survives 30 foot fall - video
- Replies: 1
- Views: 698
- Oct 12 2018 9:19am
- Forum: General Discussion
- Topic: About as close a shave as you can get!
- Replies: 5
- Views: 1107
- Jul 29 2018 1:31pm
- Forum: Motor Technology
- Topic: Minimising rotor losses
- Replies: 94
- Views: 8688
Re: Minimising rotor losses
You're on a roll, Lars :) Thanks for the useful references. Interesting how little the resistance between surfaces needs to be to avoid conduction of eddys.... I guess that's why you can get away with a thin oxide layer on stator laminations. With regard to finding the likelihood of serious rotor lo...
- Jul 29 2018 4:40am
- Forum: EBike Build Threads
- Topic: My Sun Trip Bike, Back to Back Tandem Trike with Rowing Generator, Pedals, +Solar
- Replies: 342
- Views: 62508
Re: My Sun Trip Bike, Back to Back Tandem Trike with Rowing Generator, Pedals, +Solar
Awesome adventure Justin! Thanks for sharing the experience, all the way from conception.
Can't wait to see your hybrid rowing boat! Rowing generator; pedals; batteries; solar panelled roof/sail; propellor............
Can't wait to see your hybrid rowing boat! Rowing generator; pedals; batteries; solar panelled roof/sail; propellor............

- Jul 27 2018 2:44am
- Forum: Motor Technology
- Topic: Revolt RV-series motor review and comparisons
- Replies: 286
- Views: 38679
Re: Revolt RV-series motor review and comparisons
Topic split to here: viewtopic.php?f=30&t=95487
- Jul 27 2018 2:35am
- Forum: Motor Technology
- Topic: Minimising rotor losses
- Replies: 94
- Views: 8688
Re: Minimising eddy currents in rotor
Topic split at the point where the discussion of eddy currents in the rotor starts. Let me know if it needs any further attention...
- Jul 21 2018 3:43am
- Forum: Motor Technology
- Topic: Minimising rotor losses
- Replies: 94
- Views: 8688
Re: Revolt RV-series motor review and comparisons
Furthermore, I just posted what my friend in the UK has told me several times. That electrical conductivity is not the issue. He just told me that NOT having gaps between the magnets is creating the heating and losses in the magnets in higher RPM motors. Which I just posted here earlier today. He m...
- Mar 28 2018 7:38am
- Forum: Motor Technology
- Topic: Astro 3220 Rewind
- Replies: 3
- Views: 913
Re: Astro 3220 Rewind
Hi Cole,
It's 8P 24T which is an integer-slot winding.
Best to wind it as a single layer winding to get a winding factor of 1. That means the coil will span 3 slots.
See here for more information: https://www.emetor.com/windings/
It's 8P 24T which is an integer-slot winding.
Best to wind it as a single layer winding to get a winding factor of 1. That means the coil will span 3 slots.
See here for more information: https://www.emetor.com/windings/
- Mar 21 2018 7:30am
- Forum: Motor Technology
- Topic: End turns bad?
- Replies: 247
- Views: 25055
Re: End turns bad?
Everything needs to be balanced. There has to be enough iron in the teeth to avoid saturation etc.
There's no ideal distance. It varies a bit depending on the scale of the motor. For our uses around 0.6mm to 1.4mm. Obviously, the shorter the distance the greater the flux for a given magnet.
There's no ideal distance. It varies a bit depending on the scale of the motor. For our uses around 0.6mm to 1.4mm. Obviously, the shorter the distance the greater the flux for a given magnet.
- Mar 21 2018 2:39am
- Forum: Motor Technology
- Topic: End turns bad?
- Replies: 247
- Views: 25055
Re: End turns bad?
Ok so the end TURN if not contributing to the Pole flux at all or at least significantly can be kept short by having more slots/teeth closer together in the core thus increasing the number of stator slots thus increasing the number aka total active length of the windings increasing the motor torque...
- Mar 19 2018 5:57am
- Forum: Motor Technology
- Topic: End turns bad?
- Replies: 247
- Views: 25055
Re: End turns bad?
I further suspect that even though the full turn of the coil does not contribute to the Lorentz calculation that this does NOT mean it has no effect, this is merely a side effect of that particular analytical approach to the solution. Both the permanent magnet field, and the coil field exist in the...
- Mar 19 2018 5:20am
- Forum: Motor Technology
- Topic: End turns bad?
- Replies: 247
- Views: 25055
Re: End turns bad?
Ok now for the end turns...I mean the wire between the coils around a stator tooth ... The entire length of the end turn is ... The circumference of the stator core ... No, that's not what we're discussing in this thread. It's the section of each turn of the coil returning it to the other side of t...
- Mar 18 2018 3:45pm
- Forum: Motor Technology
- Topic: End turns bad?
- Replies: 247
- Views: 25055
- Mar 18 2018 1:57pm
- Forum: Motor Technology
- Topic: Magnetic reaction force and magnet strength
- Replies: 8
- Views: 1207
Re: Magnetic reaction force and magnet strength
Brushless Permanent Magnet Motor Design - Duane C. Hanselman But start with the first chapter of: Electric Motors and Drives - Austin Hughes https://books.google.co.uk/books?id=jjuTYtKokc8C&printsec=frontcover&dq=fundamentals+austin+hughes&hl=en&sa=X&ved=0ahUKEwjlyNaWhZ_LAhVHthoK...
- Mar 18 2018 11:26am
- Forum: Motor Technology
- Topic: End turns bad?
- Replies: 247
- Views: 25055
Re: End turns bad?
In the interest of balance: http://www.mpoweruk.com/machines.htm