Reply To: NHTSA safety ratings and in-wheel motors

Aptera Community Aptera Discussions NHTSA safety ratings and in-wheel motors Reply To: NHTSA safety ratings and in-wheel motors

Aptera Community Aptera Discussions NHTSA safety ratings and in-wheel motors Reply To: NHTSA safety ratings and in-wheel motors

  • Joshua Rosen

    Member
    September 30, 2021 at 7:43 am

    Putting on my EE hat, I have zero concerns about there being an electrical hazard if a wheel is sheered off. The power to the wheel motors is managed by the motor controllers. Under normal circumstances power will only be applied when the car is moving, when it’s stationary, after a crash for instance then no power is applied. In addition to that the load is always being measured. If there is a short, possible after a crash, no power will be sent to the wires. The power supply in your PC have overcurrent detection which shuts it down if a short is detected, a modern power supply doesn’t blow up or even blow a fuse if there is a short. Those power supplies are much cheaper devices than the motor controller in an EV. In the case of an open wire the motor controller will sense that there is no load and likewise send no current to a open circuit. That’s just the usual operation. Undoubtedly there will be crash sensors that cause the whole electrical system to shutdown.

    As for maintaining the integrity of the passenger compartment, that’s not my area of expertise but I believe them when thy say that it will be extremely safe. Composites are one of Aptera’s core competencies. The NHTSA and IIHS tests will be extremely important to Aptera’s future, they know this and it has to be at the top of their priority list.