Category
Electric & Hybrid
3 articles
Plug-in Hybrids: Two Cars Sharing One Body Shell
A plug-in hybrid's window sticker carries two fuel economy figures because charge-depleting and charge-sustaining are genuinely different vehicles. Which one you own depends on you.
Brushless Motors: Why Kt and Ke Are the Same Number
A brushless motor datasheet lists its torque constant and its back-EMF constant separately. In SI units they are identical, and conservation of energy is the reason.
Motor Sizing: The Two Numbers That Catch People Out
Steady-state torque is the easiest part of a motor specification to get right. Inertia ratio and duty cycle are where the expensive mistakes actually live.