SWF
18 October 2011, 1150
Hello all. I'm a new member and have been following the EV scene closely for quite a few years, but have just started my first EV.
I am in the process of converting a 2004 Polaris Sportsman ATV, and would like some comments on motor selection for this project.
First some specs on the machine and stock engine:
- original stock weight of about 700lbs, and after conversion expect the weight will be closer to 800lbs
- specs of stock engine: max of 37HP @ 6600rpm and 33 ft/lbs @ 5400rpm on the crankshaft
- on-demand all-wheel drive
- two speed (hi-low) transmission that will be driven by motor with synchronous belt system. Assuming 1:1 input into transmission, a motor RPM of 5000 translates to ground speeds of 25 and 55 km/hr in low and hi range.
I will be powering with a 72 - 96V lithium pack, probably TS or CALB cells.
So now the questions on motor selection. I am trying to decide between a AC-20 HPEV motor, or dual K91-4003 ADC motors. I'm leaning towards the AC-20 motor, mainly because it will be simpler than a dual motor approach, and also because of the higher rpm range of the AC motor. I also have a motor length limit of about 13" for the motor body, preventing me from using the larger ADC motors. Assuming I use the AC20 motor and a Curtis 1238-7501 controller, I’d like input on the following:
- Based on what I have read on the specs for the AC-20 motor, I suspect it will give equivalent or better performance than the original engine, but want input considering the weight of the machine.
- Most of the time I will be operating at low speeds and low load, but want to confirm this motor can handle low-rpm (<500) high load conditions when necessary.
- Will the motor be able to handle the vibration and general bouncing around that it will get on the ATV? The ATV has full independent suspension and the vibration will probably not be considerably worse than on a motorcycle. I have read about problems with the encoder coming loose (probably not really vibration related), and want to know if there are other issues that could come up with the motor getting bounced around.
- I assume that I will have to build some kind of enclosure for the motor to keep dirt and dust out. Should I plan on a powered ventilation system?
Any other considerations that I should think about?
Thanks for the help.
I am in the process of converting a 2004 Polaris Sportsman ATV, and would like some comments on motor selection for this project.
First some specs on the machine and stock engine:
- original stock weight of about 700lbs, and after conversion expect the weight will be closer to 800lbs
- specs of stock engine: max of 37HP @ 6600rpm and 33 ft/lbs @ 5400rpm on the crankshaft
- on-demand all-wheel drive
- two speed (hi-low) transmission that will be driven by motor with synchronous belt system. Assuming 1:1 input into transmission, a motor RPM of 5000 translates to ground speeds of 25 and 55 km/hr in low and hi range.
I will be powering with a 72 - 96V lithium pack, probably TS or CALB cells.
So now the questions on motor selection. I am trying to decide between a AC-20 HPEV motor, or dual K91-4003 ADC motors. I'm leaning towards the AC-20 motor, mainly because it will be simpler than a dual motor approach, and also because of the higher rpm range of the AC motor. I also have a motor length limit of about 13" for the motor body, preventing me from using the larger ADC motors. Assuming I use the AC20 motor and a Curtis 1238-7501 controller, I’d like input on the following:
- Based on what I have read on the specs for the AC-20 motor, I suspect it will give equivalent or better performance than the original engine, but want input considering the weight of the machine.
- Most of the time I will be operating at low speeds and low load, but want to confirm this motor can handle low-rpm (<500) high load conditions when necessary.
- Will the motor be able to handle the vibration and general bouncing around that it will get on the ATV? The ATV has full independent suspension and the vibration will probably not be considerably worse than on a motorcycle. I have read about problems with the encoder coming loose (probably not really vibration related), and want to know if there are other issues that could come up with the motor getting bounced around.
- I assume that I will have to build some kind of enclosure for the motor to keep dirt and dust out. Should I plan on a powered ventilation system?
Any other considerations that I should think about?
Thanks for the help.