Design Software Modules for Every Transformer & Small Choke / Inductor

Rent our all-in-one transformer / small choke & inductor design software and get four specialised programs for small, large, and toroidal transformers plus small chokes & inductors – all in one licence.

Overview – Four Programs in One Suite

RALE Design Software for small transformers
RALE Design Software for toroidal transformers
RALE Design Software for large transformers
RALE Design Software for small chokes & inductors

When you rent our all-in-one transformer / small chokes & inductors design software, your package unlocks all four programs at once. Thanks to more than 40 years of continuous development, RALE Design Software has become a powerful tool for over 120 manufacturers of transformers and small chokes & inductors worldwide (see List of Users).

Below you will find the wide range of transformers and small chokes & inductors you can design with RALE Design Software. Need inspiration? Check out our free design examples for detailed know-how and ready-to-use input files.

Want to maximise your profit? Contact us to get your licence and save 10 – 20 % materials while cutting design time dramatically. Rale offers free support – from first steps to advanced optimisation – and we even provide a separate design service for constant-voltage transformers on request.

Why choose our all-in-one transformer and small chokes & inductors design software?

Four modules – one licence: small, large, toroidal transformers and small chokes & inductors covered in a single tool.
Design 5× faster: automatic winding layouts, loss calculations and thermal checks.
Save 10 – 20 % materials: RALE Design Software optimises copper / aluminum fill and core size for minimum cost.
Standards ready: built-in IEC, UL and VDE compliance rules.
Our all-in-one transformer and small chokes & inductors design software runs on any Windows 10 (or higher) PC: no special hardware required.
Free updates & expert support: 40 + years of transformer / small chokes & inductors know-how at your service.

Small and Toroidal Transformer Design Module

Optimise transformers up to 50 kVA in minutes. Automatic IEC 61558 compliance checks included.

Main Properties

Power: up to 50 KVA at 50/60 Hz, 3 phase, class B
Frequency: between 10 Hz – 500 kHz
Cores: EU, UI, 3EI and all ferrite cores, toroid
Bobbins: single section, double section
Case: potted and without potting
Steels: GO, NGO, Ni-Fe, ferrites and powders
Core assembly: alternate stacking, welded, module
Cu, Al wires: round, flat, litz
Isolation class: A, E, B, F, and C
Windings: max. 8 primary taps, max. 8 secondary windings
Design criterion: temperature rise or regulation
Cooling: AN, AF

Typical Small Transformers

Autotransformers
Inherently short circuit proof transformers: 50/60 Hz; 0.5 – 5 VA; isolation class B and F; potted; EI welded or ready core; double section bobbin; steel: GO and NGO
Non-short circuit proof transformers: protected by slow fuse; isolation class B and F
Non-short circuit proof transformers: protected by thermal fuse
Halogen lamp transformers
LED transformers 10 VA, 50/60 Hz
Control transformers: Ucc ≤ 5 %; output power at 5 % voltage drop
Medical transformers: no load current ≤ 2 %; inrush current factors ≤ 8
Power transformers: up to 15 KVA per leg; 50/60 Hz; core EI, UI, 3EI; steel: GO; with cooling channel in front and back
Universal transformers: with 8 taps on the primary side
Universal autotransformers: max. 8 taps; with or without secondary windings
Rectifier transformers: push-pull; single bridge, three phase bridge; with R, RL, RC load; input voltage form: sinewave and rectangular
High frequency transformer: up to 500 kHz; AC/AC, AC/DC; forward, flyback, push-pull, and resonance transformer; with ferrite cores: SIEMENS, PHILIPS, TDK, MAGNETICS and more
Motor starting transformers: in three steps: 50 %, 70 %, 86 %; up to 10 seconds; with gapped core
Flat transformers / low height transformers: cores: EI, UI; steel: GO
Battery charger transformers
Welding transformers
High leakage inductance transformers with integrated inductance
High leakage inductance transformers with magnetic shunt
Gas ignition transformers
Audiotransformers
Current transformers; class 0.2 – 1 %: steel: GO, Ni-Fe
Voltage transformers

Large Power Transformer Design Module

Main Properties

Power: up to 3.3 MVA per leg at 50/60 Hz
Frequency: up to 10 – 1000 Hz
Cores: EI, UI, 3EI, 5EI, DELTA; “round”, oval, and rectangle cross section
Bobbins: with or without printed board
Steels: GO, NGO, Ni-Fe
Core assembly: 7 different core assemblies
Cu, Al wires: round, flat, litz, foil
Isolation class: A, E, B, F, H, and C
Cooling: air, water and oil cooling: open, in cabinet, in oil tank; with or without cooling channels; AN and AF
Windings: max. 10 windings
Design criterion: efficiency or temperature rise
Current: up to 10 kA, with max. 5 harmonics

Typical Large Transformers

Dry power transformers: up to 1 MVA per leg at 50/60 Hz
Oil distribution transformers: up to 3.3 MVA per leg at 50/60 Hz; up to 35 kV; in oil tank; isolation class A; with optimized core in view of Ucc, efficiency or temperature rise
Rectifier transformers: with 12 different rectifier circuits
K-factor transformers: efficiency 98.5 %; Ucc 4 %; K-factor ≤ 40; inrush current factor < 5
Le Blanc transformers
Scott transformers
Constant voltage transformers
HVT (20 kV, 110 V, 1 A, 0.2%, in oil)

Inductor & Choke Design Module

Main Properties

Type of inductance: first harmonic inductance, RMS inductance, impulse inductance, differential inductance
Gapped cores: EI, UI, 3EI, and all ferrite cores
Steels: GO, NGO, Ni-Fe, ferrites and powder
Current: 1000 A with 8 harmonics
Cu, Al wires: round, flat, rectangle, litz, foil
Cooling: AN, AF; with or without cooling channel in the core (with or without bobbin) and in the winding
Isolation class: E, B, F, H, and C
Design criterion: temperature rise or Q-factor

Typical Chokes and Inductors

DC-smoothing chokes
AC-commutating chokes
LC-power factor correction filter
PFC, Power factor correction chokes
Motor sinus filter chokes