Cross-discipline · Reference · Part II

Sizing & Process Formula Lab

Part I gave you the everyday formulas. Open this one when you're sizing something (a motor, a cable, a heater) or working a process number. It uses the same live calculators as Part I and covers motor & servo sizing (accel torque, RMS, the inertia-ratio rule), electrical sizing (voltage drop, transformer, PF-correction caps, breakers), process/flow/heat, and a live unit converter for the conversions you redo forever.

🛠️ motor sizing⚡ electrical sizing🌊 process & heat🔄 converter

← Formula Lab (Part I)

🛠️ Motor sizing is the interview question and the real-world trap. You must beat the load at its worst moment (acceleration), survive the average (RMS heating), and keep the inertia ratio sane (≤ ~10:1) or the servo will hunt. Work the four numbers below.

⚡ Electrical sizing keeps the panel legal and the volts where they belong: voltage drop over a cable run, transformer kVA, the capacitor that fixes a bad power factor, and breaker sizing at 125%.

🌊 Process math: how much energy to heat a tank, how big the tank is, the pump affinity laws (the cube that makes VFDs save so much), and Reynolds number for laminar-vs-turbulent.

🔄 The converter you'll reuse forever. Pick a category, type a value and choose its unit, and every other unit updates live. The conversions engineers fat-finger most: rpm↔rad/s, HP↔kW, bar↔psi↔Pa, N·m↔lb·ft, °C↔°F↔K.