variable regenerative braking

[trex]

You wrote 'the often ignored and wrongly-criticised DD rear hub motor'.
The criticism leveled against DD motors is often about their low efficiency at low revs. DD motors produce relatively low torque despite having a large core. Another often cited criticism against DD motor is the small drag, making riding without power an unpleasant experience.
My point is the criticism of DD motors is often justified. If you are happy with the typical 12NM torque of your Xion then fine. Many new purchasers of e-bikes need more than that.

 

[Cyclezee]

Hi Paul,
Heinzmann bikes and conversion kits with the Direct Power systems have 3 selectable levels of regeneration which is independent of braking.

We have a customer in southern France who uses it to good effect on steep descents.
http://www.ebike.heinzmann.com/en/systems/directpower/motor#

Ansmann also have a Direct Drive rear motor system with selectable regeneration, the RM7.0
http://www.ansmann-energy.com/en/e-bike-systems/rear-motor-rm7-0.html

As has already been mentioned BionX have this too, but they are very expensive and have relatively low capacity batteries.

Value for money wise Heinzmann who offer front or rear kits is the best, Ansmann is the neatest and easiest to install.

 

[oldtom]

My point is the criticism of DD motors is often justified. If you are happy with the typical 12NM torque of your Xion then fine. Many new purchasers of e-bikes need more than that.

You're doing it again trex. You seem to regard yourself as the self-appointed spokesman for new purchasers now, able to describe what you believe they need in an EAPC. That's just arrogance!

Clearly, you haven't ridden a Xion-powered machine or you would realise just how well they perform and how closely they mimic the hill-climbing ability of many crank-drive bikes. Stark numbers simply do not reflect the power delivery of the Xion motor. I had difficulty discerning the difference between an Impulse-driven machine and the Xion in back-to-back test rides before purchase and I can't recall the Impulse-driven bikes being criticised for a lack of power.

No doubt, if the label on the frame read 'Woosh', you'd be praising its abilities as you have done with every other bike from that seller!

Tom

 

[trex]

point taken.

 

[trex]

...
No doubt, if the label on the frame read 'Woosh', you'd be praising its abilities as you have done with every other bike from that seller!

I recommend them only when someone is on a budget of less than £1,000 and where their particular model or models have merits.

 

[anotherkiwi]

Regen is great for braking but not so great for charging because the charging port of the BMS is expecting 2 A current over a long period of time whereas regen produces massive gobs of current over a very short period (you go faster down hill than up).

 

[oldtom]

Regen is great for braking but not so great for charging because the charging port of the BMS is expecting 2 A current over a long period of time whereas regen produces massive gobs of current over a very short period (you go faster down hill than up).

Thank you, anotherkiwi, for that intensely technical description of the mysteries of energy recuperation in the bicycle application.

Accuracy, brevity with massive gobs of clarity! Your explanation works for me!

Tom

 

[KirstinS]

point taken.

The mark of a true gent

IMHO

 

[Juergen]

Regenerative brake in my e-bike is great, KT-LED3 and KT controller, I really do like it, gives me more distance, cause I do live in a hilly side in South of Spain and really need the power to climb uphill with the weekly shopping.