- #1
Raazi
- 7
- 0
Hi,
I am a beginner in terms of mechanics and am an electrical engineer so I apologize in advance for asking what may be trivial questions. I am attempting to create a prototype design for an electric vehicle (truck) in which I am mimicking the Telsa drive train configuration but I am stumped on a couple of points which I was hoping the PF community could clear up for me. The vehicle model I am considering is a dual drive electric AWD vehicle, having a front and rear trans-axle with a 65KW motor on each axle (there is no mechanical connection between the front and rear axles).
1.) In an electric vehicle how is all wheel drive typically implemented in the scenario where there is a 65 KW PMSM (w single speed transmission) on both axles? Are there any reference materials explaining the torque splitting process for this type of situation?
To the best of my understanding it would be done through a torque management system which would limit the maximum torque to the front and rear axle based on the traction available to the front and rear axles.
2.) Why can't you maintain the same torque on each axle in an AWD configuration?
I can't find a good reason for this other than it might cause excessive some stress on each axle and cause wheel slip in certain conditions, but I spoke to an automotive engineer and he told me that it is dangerous to do run both motors at the same speed.
3.) I am trying to run some numbers for a first order approximation, but I am unsure of how to incorporate torque from two motors into my calculations (would the torque just be doubled in a dual drive system) See model here?
Regards,
Raazi
I am a beginner in terms of mechanics and am an electrical engineer so I apologize in advance for asking what may be trivial questions. I am attempting to create a prototype design for an electric vehicle (truck) in which I am mimicking the Telsa drive train configuration but I am stumped on a couple of points which I was hoping the PF community could clear up for me. The vehicle model I am considering is a dual drive electric AWD vehicle, having a front and rear trans-axle with a 65KW motor on each axle (there is no mechanical connection between the front and rear axles).
1.) In an electric vehicle how is all wheel drive typically implemented in the scenario where there is a 65 KW PMSM (w single speed transmission) on both axles? Are there any reference materials explaining the torque splitting process for this type of situation?
To the best of my understanding it would be done through a torque management system which would limit the maximum torque to the front and rear axle based on the traction available to the front and rear axles.
2.) Why can't you maintain the same torque on each axle in an AWD configuration?
I can't find a good reason for this other than it might cause excessive some stress on each axle and cause wheel slip in certain conditions, but I spoke to an automotive engineer and he told me that it is dangerous to do run both motors at the same speed.
3.) I am trying to run some numbers for a first order approximation, but I am unsure of how to incorporate torque from two motors into my calculations (would the torque just be doubled in a dual drive system) See model here?
Regards,
Raazi