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EV Motor Core Stamping: Complete Guide to Lamination Press Selection

📅 July 2026
📂 EV Motor Stamping
⏱ 10 min read

EV motor core lamination stamping press producing silicon steel rotor and stator cores for electric vehicle traction motors

EV motor core lamination stamping at Taifeng Machinery — silicon steel rotor and stator production

Introduction

The global electric vehicle market is projected to reach 40 million units annually by 2030. Every EV needs 1–3 traction motors, and every motor needs hundreds of precisely stamped silicon steel laminations stacked into rotor and stator cores.

This demand has created a gold rush for motor core stamping — but selecting the wrong press can cost manufacturers millions in scrap, rework, and lost production. Lamination stamping is one of the most demanding applications in metal forming: tight tolerances, ultra-thin material, high speeds, and zero tolerance for burrs or deformation.

This guide walks you through everything you need to know to select the right lamination press for EV motor core production.

What Is Motor Lamination Stamping?

A motor core (rotor or stator) is built by stacking hundreds of thin silicon steel sheets — called laminations — to reduce eddy current losses. Each lamination is stamped from electrical steel sheet (typically 0.2–0.5 mm thick) using a progressive die in a high-speed press.

EV motor cross-section showing rotor, stator, silicon steel laminations, magnet slots, and winding positions — EV motor cross-section — rotor, stator, silicon steel laminations, magnet slots, and winding positions

Key parameters of a typical EV motor lamination:

Single silicon steel lamination close-up for EV motor rotor — 0.3mm thickness with precision-stamped slots and interlocking tabs — Single silicon steel lamination close-up — precision-stamped slots with interlocking tabs

Parameter	Typical Range
Material	Silicon steel (non-grain oriented)
Sheet thickness	0.25–0.35 mm
Dimensional tolerance	±0.02–0.05 mm
Burr height	≤0.02 mm
Stacking method	Interlocking / welding / bonding
Parts per motor	200–600 laminations
Slots per lamination	24–72 (varies by motor design)

Why EV Motors Are Different

Traditional industrial motors use simple lamination geometries. EV traction motors are fundamentally more demanding:

1. Complex Geometry

EV motors (especially interior permanent magnet / IPM designs) have V-shaped magnet slots, flux barriers, and thin bridge sections that require extremely precise punch control.

2. Thinner Material

To maximize power density, EV motor laminations use 0.25–0.30 mm silicon steel — thinner than the 0.5 mm standard in industrial motors.

3. Higher Speed Requirements

EV motor production volumes (100,000–500,000 motors/year per line) require stamping speeds of 200–400 SPM with consistent quality.

4. Zero-Defect Stacking

Modern EV motors use self-bonding lamination technology — the laminations are stacked and bonded during stamping without separate welding or riveting.

Types of Presses for Lamination Stamping

A. High-Speed Mechanical Press

The industry standard for high-volume lamination stamping.

High-speed mechanical stamping press for EV motor lamination production — 150 to 300 SPM with integrated coil feed line — High-speed mechanical press for EV motor lamination — 150 to 300 SPM with integrated coil feed line

Speed: 150–400 SPM
Tonnage: 60–300 tons
Stroke: 20–40 mm (short stroke for lamination work)
Accuracy: ±0.01–0.02 mm at bottom dead center

Best for: High-volume rotor/stator stamping with progressive dies at 250+ SPM.

B. Servo Press

The fastest-growing category in lamination stamping.

Speed: 100–300 SPM (variable — programmable)
Tonnage: 60–500 tons
Stroke: Fully programmable (speed, position, dwell)
Accuracy: ±0.005–0.01 mm

Key advantages: Programmable slide motion, dwell at bottom dead center, energy savings of 30–50%, real-time tonnage monitoring.

C. Tandem / Transfer Press Lines

For very high volumes with complex multi-stage forming — multiple presses in sequence with automated transfer between stations.

How to Select the Right Lamination Press

Step 1: Define Your Lamination Specifications

Before evaluating presses, gather these inputs:

Input	Why It Matters
Lamination OD / ID	Determines press bed size and tonnage
Material thickness	Affects die clearance and punch force
Material grade	Higher silicon content = harder to stamp
Slot count and geometry	Determines number of punch stations
Tolerance requirements	Sets minimum press accuracy class
Stacking method	Interlocking tabs need forming stations

Step 2: Calculate Required Tonnage

Basic formula:

Tonnage = (Cutting perimeter × Material thickness × Shear strength) / 1,000

Example — EV rotor lamination: OD 200 mm, 48 slots, 0.30 mm silicon steel → Tonnage ≈ 38 tons → Select 50-ton minimum with 30% safety margin.

Step 3: Match Press Speed to Production Volume

Annual Volume	Required SPM	Press Type
< 50,000 motors	100–150	Servo press or standard mechanical
50,000–200,000	150–250	High-speed mechanical or servo
200,000–500,000	250–350	High-speed mechanical (dedicated)
> 500,000	300–400+	Tandem line or multi-press system

Step 4: Evaluate Press Accuracy

Lamination stamping requires JIS Special Class or Class 1 accuracy. For EV motor laminations, JIS Class 1 minimum. For self-bonding laminations, JIS Special Class recommended.

Progressive Die Design for EV Motor Laminations

The progressive die is the heart of lamination production. A typical EV motor lamination die includes:

Progressive die for EV motor lamination stamping — unfolded view showing multiple stations from pilot punching through slot punching, forming, and cutoff — Progressive die for EV motor lamination — unfolded view showing multi-station punch and form sequence

Pilot punching station — establishes reference holes for pitch control
Slot punching station — punches all rotor or stator slots
ID/OD punching station — separates lamination from strip
Forming station — creates interlocking tabs or magnet slots
Stacking station — auto-stacks laminations in the die

Die cost: ¥200,000–800,000 ($30,000–120,000) depending on complexity. Die life: 50–100 million strokes with proper maintenance and carbide tooling.

Common Mistakes in Lamination Press Selection

❌ Undersizing tonnage — Always include safety margin
❌ Ignoring deflection — Lack of rigidity produces inconsistent parts
❌ Choosing speed over accuracy — Accuracy first, then speed
❌ Neglecting servo advantages — Programmable stroke can eliminate secondary operations
❌ Poor coil handling — Match feeder quality to press accuracy

Taifeng Lamination Press Solutions

Taifeng Machinery offers high-speed mechanical presses (60–250 tons, 150–300 SPM) and servo presses (60–300 tons) specifically configured for EV motor lamination stamping.

Taifeng servo stamping press with programmable slide motion for EV motor core lamination production — Taifeng servo stamping press with programmable slide motion for EV motor core production

Our lamination press features:

JIS Class 1 standard accuracy (Special Class optional)
Short stroke design (25–35 mm) optimized for thin material
Integrated tonnage monitoring and overload protection
Compatible with all major progressive die and feeder brands
Complete turnkey solutions: press + feeder + leveler + stacking

Shipped to: Vietnam, India, Mexico, Turkey, Indonesia, Thailand, Brazil, Egypt, and 30+ countries.

Ready to discuss your EV motor core stamping project? Send us your lamination drawing — we'll recommend the right press, die concept, and production line configuration within 48 hours.

Tags:
EV motor core stamping
lamination press
silicon steel stamping
servo press
electric vehicle motor

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Tell us your requirements and our engineers will recommend the right model and configuration. We reply within 24 hours.

Free technical consultation & model recommendation
Customized press configuration for your application
Competitive factory-direct pricing
Installation guidance & operator training included
12-month warranty & lifetime technical support
OEM / ODM customization available
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Home
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News
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EV Motor Stamping

EV Motor Core Stamping: Complete Guide to Lamination Press Selection

📅 July 2026
📂 EV Motor Stamping
⏱ 10 min read

EV motor core lamination stamping press producing silicon steel rotor and stator cores

EV motor core lamination stamping at Taifeng Machinery — rotor and stator production

Introduction
What Is Motor Lamination?
Why EV Motors Are Different
Types of Presses
Selection Guide
Progressive Die Design
Common Mistakes
Taifeng Solutions

Introduction

This demand has created a gold rush for motor core stamping — but selecting the wrong press can cost millions in scrap, rework, and lost production.

This guide walks you through selecting the right lamination press for EV motor core production.

What Is Motor Lamination Stamping?

A motor core is built by stacking hundreds of thin silicon steel sheets — called laminations — to reduce eddy current losses.

Single silicon steel lamination close-up for EV motor rotor — 0.3mm thickness with precision-stamped slots — Single silicon steel lamination close-up — precision-stamped slots

Parameter	Typical Range
Material	Silicon steel (non-grain oriented)
Sheet thickness	0.25–0.35 mm
Tolerance	±0.02–0.05 mm
Burr height	≤0.02 mm
Parts per motor	200–600 laminations

Why EV Motors Are Different

EV traction motors are fundamentally more demanding than industrial motors:

Complex Geometry: V-shaped magnet slots, flux barriers, thin bridge sections
Thinner Material: 0.25–0.30 mm silicon steel vs 0.5 mm standard
Higher Speed: 200–400 SPM for 100K–500K motors/year
Zero-Defect: Self-bonding lamination technology requires absolute precision