One thing I have noticed since I started using my current hub motor which presently is hand throttle only is that when applying electrical power to the motor it seems to store energy somehow and my trike when I let off the hand throttle will and can coast faster and longer than if I were simply pedaling under human power only. It is considerably noticeable. I am not sure what the term is for this. I titled this post Inertia or Stored Energy but neither one may be correct.
I have a new (never installed) torque sensor for the bottom bracket (crankset). I bought one when I bought my e-motor conversion kit from Grin Technologies. It required a different crankset than what came on my Catrike so I spent good money to buy one. With my assistance and guidance my LBS installed the torque sensor with this new crankset but the unit was faulty and never worked. Grin Technologies told me that this particular torque sensor has been very troublesome and many have not worked. Of course, they didn’t tell me this until after I bought it and spent all this extra money to install it. It was a lot of wasted money. Grin Technologies had me send it back to them and they sent me a different torque sensor and, of course, it required yet another crankset. Consequently I never installed this 2nd torque sensor as I just didn’t/haven’t had the money to go thru all of this again. I am considering it now however. I would really like to have true pedal assist and not just a hand throttle. Some hub motors have a torque sensor built into them and are located inside the hub motor. Unfortunately mine does not. I don’t like anything about this “after market” approach as I call it. It is a very poor way to accomplish this. The unit is difficult to install and it is very easily damaged as it has extremely tiny wires which break very easily. That is my story and I am stuck with it as well as sticking to it. I spent the money for a torque sensor initially as I wanted a system that “felt natural” when pedaling. That is still my goal. I need to take the torque sensor into my LBS so they can figure out what is needed in the way of a crankset, discover one and get it ordered. As many of you know having a hand throttle only presents a problem sometimes as it violates some trail rules. Personally I think it is ridiculous but it is the way it is. Remedying this situation will help ensure that I can …
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One thought on “INERTIA OR STORED ENERGY … TORQUE SENSOR”
Sounds to me like at rest your throttle is slightly over baseline voltage at rest (.86 of a volt if memory serves me correctly, double ck with Grin for the specs)
There is no such thing as stored energy in either a geared or direct drive (DD) hub motor. If yours is DD then what you describe makes sense, if the baseline is high – it would be helping to overcome the cogging torque of the motor (drag)
Geared motors just freewheel when no power is applied
Hope this helps!