Practical info regardin HPM5k

[urosv]

Hi there guys. I was wondering what is the practical possibility to use HPM5k, 48V with HPC300 controller for a EV car with total of its weight of 600kg. (2 person for example included). Is it possible to get some practical performance of lets say 40kmh and enough torque to go 300m on 10% slope ? Is there a need of water cooling motors/controller or fan cooling is enough.
Regards and thanks for the info.

[Bikemad]

The 48V 5kW motor with the 8:1 gear ratio axle would need at least an 18" outer diameter tyre in order to reach 40 km/h with the motor running at ~3,740rpm.



From the above diagram, the force required to move a 600kg vehicle up a 10 degree slope would be at least 105kg (600 x Sin 10) and that's without allowing for frictional forces at the tyres, mechanical losses through the gear-train and wind resistance etc.

According to my spreadsheet, the motor would need to develop at least 30Nm of torque before the vehicle would even move, let alone accelerate up the slope.

The motor draws roughly 9Amps/Nm @ 48V, therefore 30Nm x 9Amps = 270Amps (13.5kW).

This seems to be a lot of Amps for a 5kW motor.

Alan
 

[urosv]

Your calculation is saying that  at least 30Nm torque would be needed to to move the car. The technical description is saying that HPM5000 is generating 13.92Nm at 48.42V/124.838A at 3532RPM so therefore this motor is at least 2 times to weak to suit my needs. And further more your calculation is that it would need at least 13.5kW, so is the HPM10k strong enough to handle this, I think no again.

Thanks for you quick and simple info.

[Bikemad]

The 10kW motor should be able to handle at least 20kw in short bursts, but perhaps not continuously climbing a very long incline.

The 13.5kW minimum requirement was for a 10 degree incline (equivalent to a 17.6% gradient) which is a reasonably steep slope.
A 10% slope is only 5.71 degrees, and this should only require a minimum of 7.75kW to start the vehicle moving, but more power would obviously be required in order to achieve an acceptable speed rate while climbing the hill.

Alan