Published 2026-09-01
How a DC motor armature is manufactured: the 9 steps
From shaft pressing to final test, what each station does, which quality figure it controls, and where scrap usually comes from.
By Chen Guoqiang
BKD-CR-03 · Fully Automatic Servo Core Pressing MachineShaft, Core & Commutator Pressing
Cycle time2.8 s
Stack height tolerance±0.05 mm
Armature OD20–60 mm
Shaft, Core & Commutator Pressing
Fully Automatic Servo Core Pressing Machine
Model BKD-CR-03
Stacks and presses the laminated core to a set stack height with automatic lamination feeding, the highest-output core station in the range.
- Cycle time
- 2.8 s
- Stack height tolerance
- ±0.05 mm
- Armature OD
- 20–60 mm
Applicable armatures
- Motor types
- Brushed DC and universal motor armatures
- Armature OD
- 20–60 mm
- Shaft diameter
- 3–12 mm
- Slot count
- 8–24
Specifications
| Parameter | Value | Unit |
|---|---|---|
| Cycle time | 2.8 | s/pc |
| Output | 1 200 | pcs/h |
| Changeover | 25 | min |
| Stack height range | 10–60 | mm |
| Feeding | Automatic lamination feed / 自动送片 |
| Parameter | Value | Unit |
|---|---|---|
| Stack height tolerance | ±0.05 | mm |
| Positioning repeatability | ±0.015 | mm |
| Parameter | Value | Unit |
|---|---|---|
| Power supply | AC 380 V / 3 ph / 50 Hz | |
| Rated power | 3.0 | kW |
| Air pressure | 0.5–0.7 | MPa |
| Parameter | Value | Unit |
|---|---|---|
| Footprint (L×W×H) | 1 400×1000×1900 | mm |
| Weight | 850 | kg |
| Parameter | Value | Unit |
|---|---|---|
| PLC | Mitsubishi FX5U | |
| HMI | Weinview 10" | |
| Servo axes | 2 |
How it works
- 1Laminations are fed automatically from the magazine.
- 2The stack is built to the programmed height and aligned on the mandrel.
- 3The servo press consolidates the stack under controlled force.
- 4Stack height is measured and out-of-tolerance cores are rejected.
Standard configuration
- Servo drive package and safety guarding with interlocked doors
- PLC with touch-screen HMI, recipe storage per armature model
- One set of tooling for the armature model agreed at order
- Operation and maintenance manual, recommended spare parts list
Options
- Additional tooling sets for further armature models
- Data logging with CSV export or MES interface
- Automatic loading and unloading, conveyor for line integration
- Spare parts package for 12 or 24 months of production
Related articles
All machines in this process
Station 01Shaft, Core & Commutator Pressing
Automatic Shaft Pressing Machine
BKD-SP-01
- Cycle time
- 3.0 s
- Positioning repeatability
- ±0.02 mm
Station 02Shaft, Core & Commutator Pressing
Automatic End Plate Pressing Machine
BKD-EP-01
- Cycle time
- 3.2 s
- Positioning repeatability
- ±0.02 mm
Station 03Shaft, Core & Commutator Pressing
Automatic Commutator Pressing Machine
BKD-CP-01
- Cycle time
- 3.5 s
- Angular alignment
- ±0.5°
Shaft, Core & Commutator Pressing
Automatic Core Pressing Machine
BKD-CR-01
- Cycle time
- 4.0 s
- Stack height tolerance
- ±0.06 mm
Shaft, Core & Commutator Pressing
Servo Core Pressing Machine
BKD-CR-02
- Cycle time
- 3.0 s
- Positioning repeatability
- ±0.015 mm