Mach-Lee
Well-Known Member
- First Name
- Lee
- Joined
- Jul 16, 2021
- Threads
- 204
- Messages
- 7,732
- Reaction score
- 15,309
- Location
- Wisconsin
- Vehicles
- 2022 Mach-E Premium AWD
- Occupation
- Sci/Eng
Remembering my physics here and doing the math for a 7% slope (4º), the Mach-E would need about 40kW of regen to maintain 60 mph down the slope. The battery should definitely take that no problem since it's less than a fast charge. It has to be an overheating problem with the motor or motor electronics. Perhaps the rectifiers converting AC back to DC are overheating, or potentially the motor rotor or stator is getting too hot and binding due to thermal expansion closing the clearance gap between them. That's my best guess on the grinding noise heard or why the car might not want to move. After the rotor cools down and contracts the motor would be able to spin again.
What's weird is the motors can defiantly output 40kW continuously on the highway, so you would think they could handle the same in reverse, but obviously something is different during regen that's generating more heat. It would be interesting to know what the update changes exactly, perhaps an updated thermal model for the rotor/stator that tapers off regen after so long?
What's weird is the motors can defiantly output 40kW continuously on the highway, so you would think they could handle the same in reverse, but obviously something is different during regen that's generating more heat. It would be interesting to know what the update changes exactly, perhaps an updated thermal model for the rotor/stator that tapers off regen after so long?
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