A focused, affordable tool
for electric machine design
Design SPM, IPM, EESM, SynRM and PMa-SynRM machines — inner runner, outer runner or double rotor. Multistatic rotation, flux maps, torque–speed curves, efficiency maps and rotor stresses in one standalone GUI.
Why TorqueForge vs Enterprise CAE
01 / Built for motor engineers
The complete electric machine workflow, without the enterprise overhead.
SPM, IPM, EESM, SynRM, PMa-SynRM — inner, outer, double rotor.
No remesh between positions: ripple, cogging, back-EMF.
Flux maps, MTPA / MTPV, torque–speed and efficiency maps.
kw1, slot star, harmonics and a Q × 2p matrix.
Iron and copper losses, Br(T), rotor stresses.
One .tqf file with all inputs and results.
02 / Workflow
A step bar guides you left to right. Every input has a ? help, every result a CSV export.
03 / Analyses
The model is drawn once; all analyses share it. Iron losses and torque–speed update live when speed, Udc or loss data change — no new FEMM run.
Static solution: torque, flux linkages, |B| field and air-gap flux density.
1/6 or full electrical period; mean torque, ripple, ψd/ψq, induced voltage.
Cogging torque, ψ0, back-EMF constant ke, THD and harmonic spectrum.
Fourier per element, Bertotti model; teeth, yoke and rotor; hysteresis, eddy, excess.
Polar or Cartesian grid; Ld/Lq, MTPA trajectory, 3D surfaces, torque contours.
Fast or accurate; MTPA, field weakening and MTPV within current and voltage limits.
Three strategies: minimum copper loss, weighted loss shifting, maximum efficiency.
Centrifugal von Mises stress, safety factor, yield speed and rotor growth vs. air gap.
Example designs, solved with FEMM and plotted in TorqueForge — click any image to enlarge. Results always depend on the design and the inputs.
Electromagnetics · flux density |B| and iron losses · swipe →
Mechanics & operating map · swipe →
04 / Machine models
Pick an arrangement, a rotor family and a design — the same three steps as in the Topology tab. Every combination is drawn, dimensioned and modelled in FEMM.
1 · Arrangement
Inner runner
Outer runner
Double rotor2 · Rotor family & design
EESM2 designs
PMSM10 designs
SynRM5 designs
PMa-SynRM2 designsNon-salient with distributed field slots · salient pole with eccentric, sinusoidal or concentric shoes
SPM: arc, bread-loaf, inset, consequent pole, Halbach · IPM: bar, V, double V, V + bar, spoke
Fluid-shaped, circular-arc, U-shaped or straight barriers (1–4 layers) · salient pole with cut-outs
Fluid or U barriers with magnets in the middle of each layer, width per layer
◆ Highlight · Double rotor
An inner and an outer rotor share one stator with slots on both sides. Every one of the 19 rotor designs is available as a double rotor — modelled, solved and evaluated like any other machine.
Slots at the bore and at the outside, two windings in series.
Separate tooth segments from gap to gap, no yoke iron — less mass, less iron loss. Ideal for tooth-coil windings.
05 / Pricing
From your first prototype to your next production motor. Prices incl. VAT, per user.
€014 days
No credit card. Full workflow, limited depth.
For evaluating TorqueForge on your own machine before you buy.
€200/ year
For universities, students and research institutes.
Every feature, for non-commercial research, theses and teaching.
€1,500/ year
Billed annually, incl. VAT. Updates included.
For engineering consultancies, motor manufacturers and mobility startups.
Compare all plans · swipe →
| Compare | Trial | Academic | Commercial |
|---|---|---|---|
| Duration | 14 days | 1 year | 1 year |
| Machine types | 6 inner-runner rotors | All 57 | All 57 |
| Mesh quality | Coarse | Coarse … very fine | Coarse … very fine |
| Parallel FEMM processes | up to 20 | up to 20 | up to 20 |
| Rotation, open circuit, iron losses | ✓ | ✓ | ✓ |
| Flux maps & torque–speed | Fast | Fast & accurate | Fast & accurate |
| Efficiency maps & strategies | — | ✓ | ✓ |
| Rotor mechanics | — | ✓ | ✓ |
| CSV export | — | ✓ | ✓ |
| Commercial use | — | — | ✓ |
| Support | Docs | Priority |
Prices apply to TorqueForge only. FEMM 5 is free open-source software by David Meeker; its original, unmodified installer is included with the TorqueForge setup. FEMM is installed as a separate program under its own license and is neither sold nor licensed by us.
06 / Good to know
A few answers before your first simulation.
TorqueForge uses FEMM 5, the free finite element solver by David Meeker, as its solver. FEMM is not covered by
the TorqueForge license: the setup contains the original, unmodified FEMM 5 installer and installs it as a separate program
(by default to C:\femm-qt) under its own open-source license. TorqueForge only runs FEMM and never
modifies it — there is no solver license to buy.
No. Every cross-section is built parametrically inside TorqueForge and handed to FEMM directly. Geometry can be exported as PNG, SVG, PDF or JSON (with region seed points) if you want to take it further.
Windows 10 or 11 (64-bit) with FEMM 5. A multi-core CPU pays off: TorqueForge spreads the solutions of a run over several FEMM processes running in parallel.
TorqueForge is checked with consistency tests: a symmetric sector against the full 360° model, and the torque against the value from the flux linkages. The geometry kernel is checked against a MATLAB reference for every machine type, and the mechanics against the analytical rotating disk. Like any numerical model, the results are approximations: always check them for plausibility before you rely on them.
FEMM 5 has no transient solver, so eddy currents in magnets and voltage-fed operation are not included. For constant-speed operating points with sinusoidal currents, the multistatic sweep gives the same torque, flux linkage and induced voltage. Mechanical losses are not part of the efficiency map.
Students, researchers and teaching staff at universities and public research institutes, for non-commercial work. Projects funded by or carried out for industry need a Commercial license.
Your .tqf project files stay on your disk. Open them with any paid license — inputs and results are
restored, nothing is solved again.
