A question that has probably been asked many times before, sorry :
If I run a motor rated for 72V on a say 48V battery, what will be the effect down at the low end of the rev range?
I understand that it will have reduced revs at the top end, but I'm not too sure I understand what happens at low revs.
I'm thinking that at low RPM if you twist the throttle to full, the controller will ramp up the voltage until the amps rise to the required level or limit, but due to the effects of back EMF etc. (of which I have a vague big picture understanding, but no clue on the detail) I'm thinking it will probably get full current at somewhat less than rated voltage (in this case 72V)?
I expect it would limit the maximum power and speed available, but that might not bother me 95% of the time. I never use everything my Beta 300 has available up in it's rev range, and have never come close to it's top speed, but I do use all the low down torque in the bottom third of it's range.
I'm really wondering if it's practical to run the QS 3000W 72V motor on lower voltage in this application? Or even the 1000W 72V if I decide on the Fatbike option?
If I run a motor rated for 72V on a say 48V battery, what will be the effect down at the low end of the rev range?
I understand that it will have reduced revs at the top end, but I'm not too sure I understand what happens at low revs.
I'm thinking that at low RPM if you twist the throttle to full, the controller will ramp up the voltage until the amps rise to the required level or limit, but due to the effects of back EMF etc. (of which I have a vague big picture understanding, but no clue on the detail) I'm thinking it will probably get full current at somewhat less than rated voltage (in this case 72V)?
I expect it would limit the maximum power and speed available, but that might not bother me 95% of the time. I never use everything my Beta 300 has available up in it's rev range, and have never come close to it's top speed, but I do use all the low down torque in the bottom third of it's range.
I'm really wondering if it's practical to run the QS 3000W 72V motor on lower voltage in this application? Or even the 1000W 72V if I decide on the Fatbike option?