Electrical
7 models
Busbar Calculation
Steady-state and short-circuit conductor temperature.
Cable/Wire Sizing (EV Powertrain)
Ampacity and voltage drop for EV powertrain cables.
Creepage and Clearance
Minimum creepage and clearance per IEC 60664-1.
Harness Bundle Diameter
Bundle diameter for mixed-gauge wiring harnesses.
Harness Designer
MIL-DTL-38999 connector pinouts and wiring schematics.
PCB Trace Width
Current capacity and trace width per IPC-2221.
Skin Depth Calculator
AC skin depth from material, frequency, and geometry.
Power Electronics
3 models
Motors
4 models
Speed ↔ Torque ↔ Power
Solve torque, power, or speed from the other two.
Id / Iq Current Vector
Id/Iq decomposition and MTPA for PMSM FOC.
Motor Winding / AC Copper Loss
DC and AC-inflated copper loss for a stator winding — round magnet wire, flat/hairpin conductors, or litz wire — from skin and proximity effect via Dowell's equation and Sullivan & Zhang's closed-form litz/round-wire method, with a frequency sweep and litz construction check.
Parallel Path Circulating Current
Circulating current and added AC loss between electrically-parallel winding strands or hairpin sub-conductors occupying different slot depths, from a coupled-network model using the classical slot-leakage loop inductance — shows the benefit of strand transposition.
Battery
2 models
Battery Pack Series/Parallel Calculator
Pack voltage, capacity, and voltage sag under load.
Battery Cell Cooling
Steady-state thermal path from a battery cell's internal heat generation to coolant or ambient air — cylindrical (18650/21700/26650/4680), prismatic, or pouch cells, cooled from the base, sides, or top through a thermal interface material, using distributed (not point-source) internal conduction.
EMC
4 models
Grounding / Bond Strap Inductance Calculator
Self-inductance and impedance of a flat grounding/bonding strap via the classical Grover/Terman formula, with a round-wire pigtail comparison — impedance, not DC resistance, governs a bond's effectiveness at RF.
Enclosure Cavity Resonance Calculator
Resonant mode frequencies of a rectangular metal enclosure — the frequencies at which shielding effectiveness can collapse toward 0dB regardless of barrier material, from the internal cavity dimensions.
Aperture & Vent Panel Shielding Calculator
Leakage through openings in an EMC shield — a thin slot or gap via radiating-aperture theory, or a vent panel/honeycomb with real depth via waveguide-below-cutoff theory, with a cutoff-frequency margin check and open-area reporting.
Shielding Effectiveness Calculator
Absorption, reflection, and multiple-reflection loss for a solid metal barrier via the classical Schelkunoff decomposition — far-field plane wave, or near-field electric-/magnetic-dipole source at a given distance, with common enclosure material presets.
Thermal
4 models
Cold Plate Designer
Hydraulic and thermal performance of a liquid cold plate whose coolant channel is built from straight sections and 45°/90°/180° bends — rectangular-channel heat-transfer coefficient, pressure drop and thermal resistance to a base temperature for a given heat load, reusing the site's coolant data.
Flow in Pipes / Pump Sizing
Pressure drop of a liquid in a pipe or hose run via Darcy-Weisbach with the Swamee-Jain friction factor, fitting minor losses and static head, plus the required pump head, hydraulic and shaft power — pairs with the heatsink and heat-exchanger calculators to size a liquid-cooling loop.
Heat Exchanger Sizing
Radiator and oil-cooler heat rejection via the effectiveness-NTU method.
Heatsink Thermal Calculator
Junction-to-ambient Rth budget and natural-convection fin-array sizing.
Mechanical
11 models
Beam Bending Calculator
Reactions, shear, moment, and deflection for any beam and load combination.
Bearing Calculator
ISO 281 life-based bearing selection with lubrication guidance.
Bolt Pattern
Bolt-group analysis for aligned grid, rectangular-perimeter, circular (bolt-circle), or fully custom fastener patterns — direct and torsional shear via the elastic method, axial/tension via unsymmetric bending (including asymmetric custom layouts), combined with preload and checked against the bolt's proof strength.
Bolted Joint
Preload, torque, and yield checks to VDI 2230.
BoM Compare
Paste a previous and a new bill of materials straight from Excel and get a part-by-part comparison — added, removed, and up-revisioned parts highlighted automatically, with configurable columns.
O-Ring Seal
Gland design to the Trelleborg guide and AS568/ISO 3601.
Fits & Limits
Interference-fit stresses to ISO 286 and Lamé theory.
Mohr's Circle Stresses
Plane-stress transformation and Mohr's circle for a 2-D stress state (σx, σy, τxy) — principal (max/min) stresses and their orientation, maximum in-plane and absolute shear, the stresses on any rotated plane, von Mises and Tresca equivalents, and a to-scale Mohr's circle with a stress-element schematic.
Shaft + Bearing System
Size a front/rear bearing pair for a supported shaft: resolve the bearing reactions, route the axial thrust (fixed–floating or an opposed angular-contact pair with induced axial loads per SKF), rate each bearing to ISO 281, and combine them into a system rating life — plus thermal axial-growth and clearance checks.
Shaft Sizing
Analyse a rotating stepped shaft (solid or hollow) on two bearings under combined bending and torsion — two-plane moment diagram, static and fatigue safety at every shoulder (Shigley/ASME with Marin endurance limit and Peterson stress-concentration factors), deflection, angle of twist, and first critical speed.
Spline Sizing
Size a straight involute spline (ISO 4156 / ANSI B92.2M, metric module) from torque and diameter — a drawing-ready dimension table with measurement over pins, an SAE/Dudley torque capacity with the governing failure mode, and a to-scale tooth profile with DXF export.
Conversions
1 utility