Are these 'self test' features something that a user can access/view via a sequence of special keypad presses etc? I'd be interested in how to do this if so!

 

First hit on google though I do have full manual saved somewhere.

https://electricbikereview.com/forum/threads/tip-yamaha-pw-how-to-check-the-number-of-cycles-absolute-battery-capacity.13057/

First hit on google though I do have full manual saved somewhere.

https://electricbikereview.com/forum/threads/tip-yamaha-pw-how-to-check-the-number-of-cycles-absolute-battery-capacity.13057/

 

Awesome! just tried it and it seems to work. Thanks for that.

 

Now.... I wonder if there is something similar for Bosch?

I would say it's more accurate to say the controller regulates the ENERGY into the motor in terms of amps x time.

 

Using an extreme example, if you considered two rectangular pulse waveforms. Waveform A has a very high peak current and a very narrow mark. Waveform B has a very low peak current and a very wide mark. The area of both (and hence energy delivered) is the same but which one gives you the most torque?

 

For the posh controllers to maintain everything perfectly as the battery volts drop they would probably need some kind of DC-DC converter in there which is fairly unlikely given the size / efficiency constraints.

 

The controller is exactly that it is a class of a DC to DC convertor.. it pumps pulses of charge through each of the coils It could be classed as either a single polarity voltage input to 3 Voltage output regulated voltage outputs bipolar. Or a DC to 3 phase AC convertor or anything else you wish.. . Each charge pulse provides impulses of mechanical force.

.. The inductance of the coil in each winding, limits the rise in current as a function of time. It might be better to think of it as quantity of charge ( coulomb's ) deposited during each pulse. The current in any winding never reaches the steady state value that ohm's law would predict. It gets switched off long before.

A larger driving voltage will assist in pumping more charge down the coil, for a fixed fixed on period. The designer of the controller can vary both the pulse rate , the PWM pattern, and the duty cycle. Even with a scope, and viewing the voltage waveforms to discern the actual patterns would be extremely difficult. , As it needs the motor windings to integrate the pulses into a current waveform.

Awesome! just tried it and it seems to work. Thanks for that.

 

Now.... I wonder if there is something similar for Bosch?

... I think you have to put it on a usb diagnostic rig at the dealers...

The battery voltage is always applied to the motor. The controller has a series of gates that open and close very quickly in short pulses of battery voltage. All it can do is control the time that the gates are open. That's why the power diminishes as the battery voltage runs down. the energy in each pulse is basically the voltage times the time of the pulse.

 

so will a 11S battery instead of 10S work without making any damage?

so will a 11S battery instead of 10S work without making any damage?

Putting an additional 4v in series will increase your overall voltage up from a nominal 36 to 40 v or about 10% . Whether it will damage , will depend on the safety margin in the controller

, d8veh, will say no bother, and I am inclined reluctantly to agree with him, but it is bringing the electronics closer to their margins. The components inside the controller all have maximum voltage ratings, overwhich they will flashover and be destroyed instantly. Typically these might be 48v or 63v . Running components close to their max ratings will reduce their lifetimes.When the components getting warmer, the flashover point decreases. My training would be to be very conservative

But the extra voltage will improve top speed , and give the bike more pep

so will a 11S battery instead of 10S work without making any damage?

Yes, it should. All the timings will be the same, so for each pulse, you'll get 10% more energy. That means 10% more torque and power, and the motor will be able to spin 10% faster because it will have more voltage to overcome the back emf.