SpeaD 2026 · Motor
The Motor Module
The technical centerpiece of SpeaD — a hybrid Roters permeance topology with full nonlinear BH-curve iteration delivers FEA-grade accuracy in milliseconds.
A hybrid permeance + BH-iteration engine
The motor is the heart of any loudspeaker, and the motor module is the technical centerpiece of SpeaD. Gap flux density, BL product, and saturation are calculated using a unique B–H curve iterative engine built on a hybrid Roters permeance topology — combining the physical intuition of the classic permeance network with full nonlinear BH-curve iteration through every magnet and steel section at every operating point.
Material database with real demag data
A large embedded material database covers all magnet grades and steel alloys in common loudspeaker use, with real multi-temperature demagnetization data from −40°C to 140°C for NdFeB, SmCo, Alnico, and ferrite types. This produces B-field curves for all standard motor topologies (flush pole, extended pole, T-pole, and C-yoke) and integrated BL(x) curves.
FEA-grade accuracy at analytical speed
This hybrid approach gives the designer both speed and FEA-grade accuracy in a single workflow. The analytical engine delivers results in milliseconds. Results have been verified against many hundreds of actual driver designs and FEA simulations.
270-degree cutaway 3D model
The motor tab also generates a 270-degree cutaway 3D model that lets the motor geometry be visualized from any angle. The 3D view renders all four motor parts as separate revolved solids with appropriate material colors, making it immediately clear how the magnetic circuit is constructed.
