Make better motor design
decisions, faster
Material selection, winding analysis, and motor modeling — all in one place. No installation. No sign-up required.
Browse Tools ↓Interactive calculators — open in your browser, no installation or sign-up needed.
Permanent Magnets
Browse a curated library of NdFeB and other permanent magnet grades. View demagnetisation B-H curves, compare remanence, coercivity, and energy product side-by-side, and convert between SI and CGS units.
Open tool →Electrical Steel
Explore core loss and permeability data for electrical steel grades from SURA, Thyssenkrupp, and Voestalpine. Compare grades at different flux densities and frequencies with interactive charts.
Open tool →Winding Analysis
Design and analyse three-phase AC windings for integer-slot, fractional-slot, and tooth-coil configurations. Visualise conductor layout, winding factor spectrum, MMF harmonics, and star-of-slots diagram. Compare multiple configurations side-by-side.
Open tool →DC Motor WIP
Analyse the steady-state performance of brushed DC motors: torque, speed, current, and efficiency across operating conditions. A practical starting point for robotics actuator sizing.
Open tool →PMSM WIP
Model surface permanent magnet synchronous motors: interactive equivalent circuits, phasor diagrams, torque–speed curves, and an efficiency map tool for sizing and performance analysis.
Open tool →Motor Selector WIP
BLDC and PMSM motor–controller matching. Describe your application — voltage, torque, speed — and get compatible motor and controller pairs with compatibility scores and direct purchase links.
Open tool →Short reads on motor design fundamentals — the theory behind the tools.
Cogging torque
Why PM motors feel notchy at low speed, how LCM(Q,P) sets cogging amplitude, and which slot-pole combinations minimise it for servo and hub motors.
Read article → 📖 ReadWinding distribution factor
Why spreading conductors across multiple slots staggers their EMF phasors — and how kd = sin(q·α/2) / (q·sin(α/2)) captures the penalty.
Read article → 📖 ReadCoil pitch factor — how a winding captures rotor flux
How slot electrical angles, coil span, and induced voltage combine into kp = sin(β/2). Includes a worked numerical example for a 12-slot / 4-pole machine.
Read article → 📖 ReadWhat is winding factor?
How the distribution and pitch factors combine to determine how efficiently a winding produces torque-generating flux.
Read article → 📖 ReadMMF harmonics in AC windings
How conductor placement creates a spatial harmonic spectrum — and why it causes torque ripple and rotor losses.
Read article → 📖 ReadInteger-slot vs fractional-slot
The slots-per-pole-per-phase ratio q and the trade-offs between distributed and tooth-coil winding configurations.
Read article → 📖 ReadHow to read a B-H curve
Decode the magnetisation curve — what saturation, permeability, and hysteresis tell you about a steel grade.
Read article → 📖 Read12s/14p vs 12s/10p: a mirror-image winding pair explained
Both share a winding factor of 0.933 yet behave differently. A side-by-side comparison of MMF harmonics, cogging torque, and operating frequency for these common FSCW configurations.
Read article → 📖 ReadNdFeB magnet grades explained
Remanence, coercivity, energy product, and temperature class suffixes — how to navigate the N35–N52 grade system.
Read article →