Flat Commutator (Disc / Planar Commutator) Manufacturer

Planar (disc) commutators for DC motors and universal motors, manufactured from your CAD or print. We focus on stable commutation, tight runout control, and repeatable mass production.

ISO 9001 certified
PPAP / FAI documentation available on request
Engineering response within 12 hours (business days)
Samples before mass production

What Is a Flat (Planar) Commutator?

A flat commutator (also called a planar/disc commutator) is a disc-shaped commutation component used to transfer current between stationary brushes and a rotating armature. Compared with hook commutators, planar commutators can be advantageous in compact axial designs and applications requiring stable brush contact on a flat surface.

Common applications: automotive actuators, power tools, home appliances, micro motors, and custom DC motor assemblies.

At a Glance: Capability Range

Item	Capability
Outer diameter (OD)	2.5 – 150.0 mm (Micro to Industrial sizes)
Inner diameter (ID)	2.0 – 80.0 mm (Custom bore fit)
Overall thickness	3.0 – 60.0 mm
Segment count	3 – 96 segments (Standard planar configurations)
Copper grade	C11000 (ETP), C10700 (Ag-bearing), C10500
Insulation system	Phenolic (Bakelite), Glass-filled, Mica-filled
Typical Inspection	Runout (<0.01mm), Flatness, Roughness (Ra), Spin test
Sample lead time	12 – 15 days (New tooling required)
Mass production lead time	25 – 30 days (After sample approval)
MOQ	500 pcs (Prototypes: 1-10 pcs accepted)

Flat Commutator Manufactured by XDC

Examine XDC’s collection of flat commutators, engineered for compact and planar motor designs. We specialize in custom-manufacturing components that follow your technical schematics precisely. Our workflow initiates with pilot units for your approval before proceeding to full-batch fulfillment. Observe our precision-crafted parts below, and directly send us your drawings to get a quote.

49mm Flat Commutator

Engineered for space-saving “pancake” motors, this 16-segment face-type unit significantly reduces axial length. Its planar contact surface ensures reliable conduction in compact, low-profile automotive or industrial designs.

57mm Face-Type Commutator

Featuring a precision-ground planar surface, this 57mm unit optimizes axial brush contact. Its stable disk geometry minimizes vibration and wear in high-performance thin-profile motor applications.

44mm 23-Bar Flat Commutator

Utilizing a high-resolution 23-segment layout, this planar unit effectively minimizes magnetic cogging. Its thin axial profile and precise segment geometry ensure smooth current rectification for compact drives.

47.6mm 16-Bar Face Commutator

Featuring a robust 16-segment planar architecture, this 47.6mm unit ensures stable axial contact. Its precision-molded segments are engineered to prevent thermal deformation and maintain surface flatness in high-speed, space-critical motor applications.

Why Engineers Choose XDC for Flat Commutators

Choosing the right flat commutator supplier has a direct impact on motor performance, brush life and production efficiency. XDC offers a combination of engineering capability and manufacturing scale tailored to OEM and ODM customers.

1) Repeatable Brush Contact Surface

We control the working face to help reduce unstable commutation and abnormal brush wear. Your drawing tolerances define acceptance—we do not “guess” what is acceptable.

2) Built for Production, Not Just Prototypes

Stable production means more than making a sample. We support process planning, traceability, and incoming/outgoing quality checks to keep batches consistent.

3) Documentation That Helps Supplier Approval

When required, we can provide FAI / PPAP-style deliverables to support your supplier qualification process.

Materials & Construction Options

We manufacture planar commutators using copper segments and insulation systems selected for thermal, electrical, and mechanical requirements.

Copper segments

Standard: C11000 (ETP Copper) – IACS ≥ 100%
High Performance: C10700 / C10500 (Silver-bearing Copper) for high-temp hardness and wear resistance.
Custom segment geometry: slot, step, chamfer, edge radius (per drawing).

Insulation system

Molding Material: Phenolic resin (Bakelite), Epoxy, or Glass-fiber reinforced compounds.
Temperature Class: Class F (155°C) or Class H (180°C) compliant options available.

Typical surface options

Machined face finish: Ra 0.4 – 0.8 µm (or per drawing).
Deburring and edge conditioning for brush safety.

Manufacturing Process

A flat commutator is only as good as its process control. Our standard flow (tailored per part):

Material preparation & segment forming
Insulation assembly / bonding
Turning / facing to final dimensions
Slotting / undercutting (if specified)
Deburring, edge conditioning & cleaning
Final inspection & documentation
Packaging to prevent damage and contamination

Quality & Inspection

We inspect to your drawing and acceptance criteria. Typical checks include:

Dimensional

OD / ID / Thickness (Micrometer & Air Gauge)
Segment geometry per drawing (Optical Profile Projector)

Geometric

Runout / Flatness: 100% check capability using Dial Indicators or CMM (Typical: <0.01mm).
Parallelism: relative to bore (as specified).

Surface

Surface roughness (Mitutoyo Surftest or equivalent).

Electrical

Insulation resistance (IR): >500MΩ @ 500V.
Dielectric withstand / Hipot: up to 1500V – 3000V (per spec).
Bar-to-bar testing.

Inspection equipment:

CMM (Coordinate Measuring Machine)
Optical Profile Projector
Digital Height Gauge & Air Gauges
Programmable Hipot Tester
Spin Testing Rig (for high-RPM validation)

Engineering Support: DFM Before You Commit

If you upload your drawing, our engineers will check:

manufacturability risks (thin walls, segment edges, bonding area)
critical dimensions and how to measure them
tolerance feasibility vs. cost and yield
suggestions to improve brush contact and reduce wear risk (when applicable)

What you get within 12 hours (business days):

manufacturability feedback (DFM notes)
quotation (prototype + production tiers)
lead time estimate
required clarifications (if any)

What We Need for an Accurate Quote

To avoid back-and-forth, please send any of the following:

Must-have

2D drawing (PDF) or 3D model (STEP/IGS/X_T/SolidWorks)
material requirement (or allow us to recommend)
critical tolerances & inspection method (if specified)

Nice-to-have

motor type and application
operating speed/current/temperature (if available)
brush type and contact requirement (if known)
annual volume (prototype / pilot / mass production)

Flat Commutator Applications & Usage Scenarios

XDC designs each flat commutator around real motor applications. Common usage scenarios include:

Automotive DC Motors

• In-tank automotive fuel pump motors
• Starter motors and related auxiliary motors
• Window lift motors and windshield wiper motors
• Blower and fan motors in HVAC systems

Household Appliance Motors

• Vacuum cleaners and small suction units
• Washing machine motors and small pumps
• Kitchen appliances such as mixers, juicers and food processors

Power Tool and Industrial Motors

• Power tools such as drills, saws, grinders and hammers
• Light industrial DC motors used in machinery, fitness equipment and doors

Micromotors and Precision Drives

• Small gearmotors and actuators
• Compact fans and blowers
• Vending and office equipment DC drives

Ready to Validate Your Design?

Upload your drawing to receive a manufacturability review and quotation.

Sample & Production

Samples are available before mass production.
After sample approval, we lock key parameters for consistent batch production.
Any change request will be reviewed through an engineering change process (ECN).

Files are used only for engineering evaluation and quoting.
NDA available.
Response within 12 hours (business days).

Flat Commutator FAQ

Below are some of the questions we frequently receive from customers considering a flat commutator solution.

What information do you need to quote a flat commutator?

A 2D drawing (PDF) or 3D model (STEP/IGS/X_T/SolidWorks) plus material/insulation requirements and any critical tolerances. If tolerances are not defined, we can propose a manufacturable tolerance set for your approval.

Can you sign an NDA?

Yes. We can sign an NDA before you share drawings and application details.

Do you provide samples before mass production?

Yes. We recommend sampling to confirm fit, brush contact performance, and inspection method alignment before mass production.

Can you support PPAP / FAI documents?

On request, we can provide PPAP/FAI-style deliverables suitable for supplier approval. Please specify your required level and document list.

What is your typical lead time?

Lead time depends on geometry, tolerances, and tooling. After receiving your drawing, we will provide a timeline with your quote (prototype and production).

How do you ensure consistent quality across batches?

We control key process steps, inspect to your acceptance criteria, and maintain traceability at the batch level. Desensitized inspection report samples can be provided.

Related Resource

At XDC, we share our deep insights into commutators, manufacturing processes, and industry experience on our blog. We invite you to explore these articles to learn more about our expertise.