2 ms·
Hitting the brakes in a 2500 kg car at 100 mph generates a megawatt of braking energy (100 * 1607/3600 * 2500 * 9.8 * 0.9 = 984 kW). Plausibly sized hub motors
by tlb 9y ago
Hitting the brakes in a 2500 kg car at 100 mph generates a megawatt of braking energy (100 * 1607/3600 * 2500 * 9.8 * 0.9 = 984 kW). Plausibly sized hub motors can't handle this even momentarily.
Brake rotors have less thermal mass, but can get red-hot without damage.
- deleted 9y ago[deleted]
- gandreani 9y agoAnother comment in this thread mentioned that the limiting factor is the MOSFET/Switch in the controller, instead of the motor itself
- abakker 9y agoHow many actuations is the motor good for? The mosfets? Brakes are great, work for a very long time, and have lots of redundancy, they are also easy to fix without diagnosing issues with mosfets, windings, switches, and wires.