An E-frame motor stamping is a CRCA steel lamination shaped like the letter “E”, stacked to form the stator core of compact electric motors. The winding sits on the centre limb, which makes the E-frame one of the most economical, high-output core shapes for small motors.
Where E-frame motor stampings are used
You will find E-frame cores in single-phase and fractional-horsepower motors: fan motors, exhaust units, small pump motors, mixer and appliance drives. The shape gives a good balance of copper window and iron path in a small footprint.
What to look for
- Material: PRIME CRCA electrical steel
- Burr control: low burr for clean, low-loss stacking
- Slot accuracy: for easy winding and smooth torque
Source it from one maker
See our E-frame motor stamping and the related E-frame electrical stamping. Pair it with matched bearings for a complete motor kit. To order or develop a die, call +91 98991 00494 or enquire online.
E-Frame Motor Stamping — what it is and where it's used
An E-frame stamping is an "E"-shaped lamination that pairs with an "I" lamination to form an E-I magnetic core. It is the workhorse core of small mains transformers, battery chargers, ballasts, shaded-pole fan motors and control gear. The E-I shape nests tightly on the coil steel strip, giving very high material utilisation and low scrap.
Technical specifications (typical)
| Parameter | Typical range |
|---|---|
| Profile | E-I (E-frame + I bar) |
| Material | CRNGO silicon steel (transformers) / CRCA (light duty) |
| Thickness | 0.35 – 0.50 mm |
| Tongue (centre-limb) width | Per lamination series (e.g. 12–75 mm) |
| Assembly | Interleaved (lap) or butt-stacked |
| Coating | Mill finish or insulating coat |
Common applications
- Step-down and control transformers
- Battery chargers and adaptors
- Chokes, ballasts and inductors
- Shaded-pole fan and pump motors
Choosing E-frame stack height and material
The centre-limb (tongue) width plus the stack height set the core's power (VA) capacity. For a given VA, a taller stack of a narrower lamination — or a wider tongue with a shorter stack — can be used; we help you pick the combination that fits your bobbin window. For transformer duty, CRNGO silicon steel keeps no-load loss and hum low; for light, intermittent duty, CRCA is a cost-effective choice.
How we build E-frame cores
E and I laminations are blanked together so the pair matches perfectly, then supplied loose for interleaving or pre-assembled. Burr and flatness are controlled so the finished stack is tight, quiet and efficient. Tell us your VA rating, primary/secondary voltage and bobbin size and we will recommend the lamination series and stack.
Frequently Asked Questions
What is an E-frame motor stamping?
What is the difference between E-frame and H-frame laminations?
How is the VA rating of an E-frame core decided?
Which material do you recommend for E-frame transformers?
Do E and I laminations come matched?
Related Technical Guides
Explore more on electrical stampings and motor components: