Giving a velomobile electric support

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TimV   10 mW

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Giving a velomobile electric support

Post by TimV » May 03 2016 10:42pm

Hi,

I recently bought a velomobile. And i want to give it ekectrical dupport.

I was thinking in the range of 24V with 350W continiues and around 500W piek. This should be enough to ride at 50km/h.

Hub motor is not possible because the velomobile has single sided support rims.

Eskimo   10 kW

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Re: Giving a velomobile electric support

Post by Eskimo » May 03 2016 11:34pm

Congratulations. 24V is bit weak, i suggest 48V. My friend built two-sided rear fork for his Mango. It also uses 26" rear wheel now.
Give it 48V/500W.
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TimV   10 mW

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Re: Giving a velomobile electric support

Post by TimV » May 04 2016 12:04am

The reasen i ask for a 24Volt system, is that i have laying around an 24V 18Ah batterie.

Eteck   1 W

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Re: Giving a velomobile electric support

Post by Eteck » May 06 2016 11:14pm

I recently bought a velomobile
Can you post a picture of it, or of one that looks like it.
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s-l500.jpg
Example of Velomobile.
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TimV   10 mW

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Re: Giving a velomobile electric support

Post by TimV » May 07 2016 12:57am

This is the velomobile. It is a Flevobike Versatile. Nr 021.
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Eskimo   10 kW

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Re: Giving a velomobile electric support

Post by Eskimo » May 07 2016 10:37am

Nice. If you already have one 24V battery, you need only another one anymore to get 48V :wink: 48V/18Ah would be pretty good pack for everyday riding.
24V will be better than nothing of course, but 18Ah is not that much with 24V.
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TimV   10 mW

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Re: Giving a velomobile electric support

Post by TimV » May 09 2016 4:29pm

I was thinking of adding an rc motor with an gear on it in the first drive line, from the pedals to the Rohloff hub. After the Rohloff is an second drive line to the rear wheel. Here it is not possible to add an motor.

The problem of this idea, is that the pedals will turn around when the motor is working.
So the controlls of the motor is a button with choosable fixed powerlevels, or a trothle.

Are there comparable builds of people who added rc motors to there bike?

TimV   10 mW

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Re: Giving a velomobile electric support

Post by TimV » Jul 26 2017 12:55am

This winter is the conversion happening. I have build an 48V (14series lithium) batterie and has 20Ah.

I aim going to buy an 48V controller and a motor with a sprocket with freewheel. But what motor should i buy?
I aim shooting for a 250 - 350W motor that i will push to piek 500W.

Its a motor with sprocket to ad to the chain before the rohloff 14speed gear. So lots of efficiency.

A brushed motor seems to be a cheap option. A brushless motor seems not to exist in motor with sprocket set up?

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amberwolf   100 GW

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Re: Giving a velomobile electric support

Post by amberwolf » Jul 26 2017 1:44am

There's quite a few threads in the non-hub motor section of the forum about both of the ways you've asked about in the previous two posts.

However, there are also pre-built drive systems like the BBSxx series that are made to drive the chain from the pedal cranks; various poeple have added them to tadpole trike designs already.

TimV   10 mW

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Re: Giving a velomobile electric support

Post by TimV » Jul 26 2017 3:38am

An crankshaftmotor is unfortunately not going to fit. Here you can see that it will be to wide.

Image

ScooterMan101   1 MW

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Re: Giving a velomobile electric support

Post by ScooterMan101 » Jul 30 2017 2:11am

Perhaps a friction drive ? ( although you will have to think about how much you will be riding your Velomobile in the Rain/On Wet Roads )

Look at Kepler's Friction Drive ... https://endless-sphere.com/forums/viewt ... 31&t=86961
My first conversion ...

https://endless-sphere.com/forums/viewt ... 1#p1077497

It's 2018 already, lets get some real , improved e-bike / e-velomobile / e-motorcycle designs .

dolbyman   1 µW

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Re: Giving a velomobile electric support

Post by dolbyman » Mar 16 2018 2:43pm

Hello did you find a motor for the versatile?
I am still searching for a good solution.
Regards Marco

TimV   10 mW

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Re: Giving a velomobile electric support

Post by TimV » Mar 16 2018 3:22pm

Not yet. Currently i aim laying the last hand on renoveting my new home witch i will move to this summer. So it is going to be a project for the next winter.

SlowCo   10 kW

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Re: Giving a velomobile electric support

Post by SlowCo » Mar 16 2018 3:33pm

05.jpg
05.jpg (16.67 KiB) Viewed 816 times
bafang-bbshd-48v-1000w_mid_drive_motor_kit.jpg
bafang-bbshd-48v-1000w_mid_drive_motor_kit.jpg (47.64 KiB) Viewed 816 times
I don't know how the crank/pedal area looks inside but it might be possible to redesign/rework the innards to incorporate a Bafang BBSHD.

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docnjoj   100 GW

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Re: Giving a velomobile electric support

Post by docnjoj » Mar 17 2018 8:43am

Ebikes.ca (grin) used to sell single sided axle motors. Might be worth an Email to see if they still sell them.
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dolbyman   1 µW

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Re: Giving a velomobile electric support

Post by dolbyman » Mar 17 2018 1:34pm

SlowCo wrote:
Mar 16 2018 3:33pm
05.jpg

bafang-bbshd-48v-1000w_mid_drive_motor_kit.jpg

I don't know how the crank/pedal area looks inside but it might be possible to redesign/rework the innards to incorporate a Bafang BBSHD.
I am afraid that the constuction does not fit the bafang motor.

SlowCo   10 kW

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Re: Giving a velomobile electric support

Post by SlowCo » Mar 17 2018 3:11pm

dolbyman wrote:
Mar 17 2018 1:34pm
SlowCo wrote:
Mar 16 2018 3:33pm
05.jpg

bafang-bbshd-48v-1000w_mid_drive_motor_kit.jpg

I don't know how the crank/pedal area looks inside but it might be possible to redesign/rework the innards to incorporate a Bafang BBSHD.
I am afraid that the constuction does not fit the bafang motor.
Why not?
From the photo it looks as if the big aluminium plate around the cranks can be replaced by a new plate or structure that allows the BBSHD to be incorporated.

TimV   10 mW

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Re: Giving a velomobile electric support

Post by TimV » Mar 17 2018 3:31pm

Yes. But the bafang construction makes the total with way to wide. The middle plate is only 4cm wide. And we cant go wider or we cant pedal at all

SlowCo   10 kW

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Re: Giving a velomobile electric support

Post by SlowCo » Mar 17 2018 4:12pm

DSCN5447.JPG
DSCN5447.JPG (71.19 KiB) Viewed 759 times
Are you sure the crank axle is only 4cm wide? That seems very small and require a special axle. What is the width between the cranks? From the photo it looks like there might be room to put a BBSHD in there even if the cranks need to be 2-3 cm further apart.

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Re: Giving a velomobile electric support

Post by Warekiwi » Apr 03 2018 8:31am

Interested to read this thread as we have just completed an electrical conversion to a Quattrovelo 4-wheel velomobile (originally from the same Dutch company who make the Quest and Strada) I've been riding it unassisted for over a year including some long European tours but unfortunately I now have a long term health problem which randomly affects my lung function making hill climbing a problem. The setup was designed by a French friend who has been using a similar setup on his QV for the past year and a half with no problems. The motor is a Smart Pie (Chinese) hub motor mounted in a rigid frame in FRONT of the pedals and drives via short chain to a chainwheel on the LEFT side of a modified Schlumph Mountain drive bottom bracket with NO increase in Q factor. (we think this is the first time anyone has done this) I wanted to keep the MD in case any malfunction ever occurs requiring me to pedal slowly home via the many steep hills I regularly encounter. The QuattroVelo has TWO wheel drive to the rear wheels using a Trykit double freewheel (instead of a differential) and an SRAM 10 speed derailleur setup giving a total of 20 gears with a very large range of ratios. Electrically, the motor is driven by a GRIN 25A controller and Cycle Analyst ver 3. It has inputs from a right wheel speed sensor, handle bar throttle , and chain idler mounted cadence sensor. Initially I just setup a profile with a 300W power limit and no other restrictions for testing- it works extremely well (too well in fact!) but now I need to create a profile that comes closer to the UK ebike rules (in particular max assisted speed 15.5mph (25kph) and 250W max output). Even at the "illegal" initial settings the efficiency is amazing - on a ride with avg speed of 22mph over 36 miles and max (pedalled) speed of 56 mph the battery use was only about 90w/hr ! (The battery is a 48V 21 aH unit, so I could ride all day at those settings)
I have been playing about with the CA limitations to legalise matters- I set a power max of 270W and speed limit of 17 mph initially but using this setting I notice that the instantaneous power never seems to go above about 180W with max throttle-- not sure why? (Making hill climbing assist less than optimal) I haven't activated the cadence sensor yet. The max assisted speed seems to work fine with the assist tailing off around the legal max of 15.5mph. I don't really understand the various throttle gain adjustments so at present these are left at defaults. Any suggestions will be most welcome.
QVmotor_s.jpg
Last edited by Warekiwi on Apr 04 2018 1:12pm, edited 1 time in total.

Warekiwi   10 mW

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Re: Giving a velomobile electric support

Post by Warekiwi » Apr 03 2018 3:18pm

And here is a photo taken from underneath (with the floor panel removed for access) As I said above there has been no increase in Q-value (pedal width) at all. The Schlumph Mountain Drive gear change button works as normal enabling the motor and/or pedal power to climb the steepest grade in conjunction with the 10speed derailleur at the rear. Because all four wheels are 20" a huge 75T chainwheel is fitted to the right side of the "bottom bracket" whilst the Golden Motor Smart Pie drives a 52T chainwheel on the LH side pedal crank. (Some clever machining was required to install the 52T chainwheel on a freewheel!)
2018-03-27 17.27.49.jpg

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