Coreless Brushed DC Motor Ø13×31 mm 38 dB Motor for Industrial Automation BDCM1331 BODENMOTION

Overview of BDCM1331 Coreless Brushed DC Motor

The BDCM1331 coreless brushed DC motor combines a Ø13 × 31 mm cylindrical body with a 20 g structure, providing more output capacity than shorter motors without moving to a substantially larger diameter. Its 2.5–4.5W product class is suited to compact industrial automation mechanisms that require responsive acceleration, controlled motion, and straightforward DC drive integration.

Four winding versions cover 3V, 6V, 12V, and 24V power platforms. Depending on the selected winding, rated speed ranges from 8,800 to 12,960 rpm and rated torque from 2.0 to 4.1 mN·m. The precious-metal brush system and coreless rotor structure support smooth rotation and a typical acoustic output of 38 dB for noise-sensitive automation assemblies.

Key Features of BDCM1331 Low-Noise Ironless Motor

• High-Speed Output – Rated speed reaches 12,960 rpm, providing useful rotational capacity for compact automation mechanisms and internal drive modules.
• Up to 80.8% Efficiency – The 3V winding reaches a maximum efficiency of 80.8%, helping reduce unnecessary electrical losses at its optimized operating point.
• Wide Operating Voltage – Four winding options from 3V to 24V simplify matching with battery systems, embedded controllers, and industrial DC supplies.
• Smooth Coreless Rotation – The ironless rotor construction reduces cogging effects, supporting more consistent acceleration and speed adjustment.
• 38 dB Low-Noise Performance – Precious-metal brush commutation helps maintain quieter operation in instruments and enclosed automation equipment.
• Gearbox-Ready Design – An optional planetary gearbox extends the motor platform into lower-speed, higher-torque actuator applications.

Technical Specifications of BDCM1331 Coreless Brushed DC Motor

The suffixes represent different winding configurations rather than interchangeable supply settings. The 2.5–4.5W designation identifies the product class, while the maximum-output figures below describe separate test operating points and should not be treated as recommended continuous power.

Motor Model	Unit	BDCM1331-01	BDCM1331-02	BDCM1331-03	BDCM1331-04
At Nominal
Nominal Voltage	V/DC	3	6	12	24
Nominal Speed	rpm	9600	8800	9280	12960
Nominal Current	A	0.9	0.5	0.2	0.4
Nominal Torque	mN·m	2.1	2.4	2.0	4.1
Free Load
No-load Speed	rpm	12000	11000	11600	16200
No-load Current	mA	45.0	30.0	18.0	12.0
At Max. Efficiency
Maximum Efficiency	%	80.8	75.8	69.4	70.5
Speed	rpm	10920	9735	9918	13932
Current	A	0.4	0.3	0.2	0.3
Torque	mN·m	0.9	1.4	1.5	3.7
At Max. Output Power
Maximum Output Power	W	3.2	3.5	3.1	11.1
Speed	rpm	6000	5500	5800	8100
Current	A	2.22	1.22	0.56	0.77
Torque	mN·m	5.1	6.0	5.0	10.5
At Stall
Stall Current	A	4.40	2.40	1.08	1.57
Stall Torque	mN·m	10.3	12.1	10.1	21.0
Motor Constants
Terminal Resistance	Ω	0.68	2.50	11.11	12.31
Terminal Inductance	mH	0.05	0.12	0.27	0.75
Torque Constant	mN·m/A	2.36	5.12	9.60	13.78
Speed Constant	rpm/V	4000.0	1833.3	966.7	675.0
Speed/Torque Constant	rpm/mN·m	1166.1	910.0	1150.3	618.5
Mechanical Time Constant	ms	8.0	6.2	7.9	4.2
Rotor Inertia	g·cm²	0.65	0.65	0.65	0.65
Number of Pole Pairs	—	1	1	1	1
Number of Phases	—	5	5	5	5
Weight	g	20	20	20	20
Typical Noise Level	dB	≤38	≤38	≤38	≤38

Not sure how to interpret model differences? See the model code breakdown below ↓

Motor Model Number Breakdown

Mechanical Design & Installation Notes for BDCM1331 Precious Metal Brush Motor

The BDCM1331 should be evaluated as part of the complete mechanism. Mounting rigidity, coupling alignment, shaft loading, supply stability, and operating cycle can all affect speed consistency, acoustic performance, and brush life.

Shaft Load Control
The sintered metal bearing supports a maximum dynamic axial load of 0.3 N and a maximum radial load of 1.2 N, measured 5 mm from the flange. Pulley, belt, cam, and offset-coupling designs should avoid transferring excessive side load to the motor shaft.

Coupling and Alignment
Axial play is specified at 0.05–0.15 mm, while radial play is limited to 0.012 mm. Accurate shaft alignment helps reduce vibration, uneven bearing loading, and additional system noise.

Press-Fit Protection
The maximum specified static press-fit force is 20 N. Assembly force should be applied through the correct structural surface rather than directly through the shaft or bearing system.

Acoustic Integration
The 38 dB figure represents typical motor-level noise. Thin brackets, hollow enclosures, gears, and poorly aligned couplings may amplify vibration after installation, so system-level acoustic testing remains necessary.

Temperature and Duty Cycle
The ambient operating range is −20°C to +80°C, relative humidity should remain below 90% RH at 25°C, and rotor temperature should not exceed 85°C. Long operating cycles should be validated under the actual load and enclosure conditions.

OEM Customization Options for BDCM1331

The selected configuration should reflect the available power supply, required operating point, installation envelope, and transmission design. Options beyond the standard datasheet should be confirmed through engineering review.

Customization Item	Available Options / Description
Winding Version	Standard 3V, 6V, 12V, or 24V configuration
Operating Point	Model selection based on target speed, torque, current, and duty cycle
Shaft Design	Shaft length or end geometry can be reviewed for the driven mechanism
Lead and Terminal Format	Electrical connection arrangement subject to project confirmation
Mounting Interface	Mechanical adaptation reviewed according to the equipment structure
Gearbox Option	Planetary gearbox available for speed reduction and torque multiplication
Sample Configuration	Prototype version selected for real-load validation before production

The planetary gearbox is the optional component specifically identified in the supplied specification. Other mechanical or electrical changes remain subject to feasibility review.

Application Fields for BDCM1331 Motor for Industrial Automation

The BDCM1331 is best considered for compact automation mechanisms that need moderate brushed-motor power, responsive motion, and relatively low acoustic output.

• Compact Automation Actuators – Drives cams, sliders, and small linear mechanisms when paired with a suitable transmission.
• Valve and Flow-Control Modules – Supports repeated opening, closing, and adjustment movements in embedded control assemblies.
• Precision Adjustment Mechanisms – Provides smooth rotation for optical, inspection, and instrument-setting functions.
• Automated Handling Devices – Powers compact rollers, feeders, and internal positioning mechanisms.
• Pump and Airflow Modules – Offers a brushed drive option for small rotating pump or fan assemblies with moderate load demand.
• Laboratory Automation Equipment – Fits compact instruments where controlled motion and limited operating noise are both relevant.

Final suitability depends on the actual starting load, transmission ratio, operating time, current limit, and required service life.

Why Choose BODENMOTION for Your BDCM1331 Automation Project

For a precious-metal brushed motor, the lowest-noise or highest-speed version is not automatically the best choice. The winding, current requirement, mechanical load, operating cycle, and transmission structure must be evaluated together.

• Four-Voltage Winding Selection – We help compare the 3V, 6V, 12V, and 24V versions according to the available supply and allowable current.
• Efficiency-Point Evaluation – Maximum-efficiency data is reviewed separately from rated and maximum-output conditions to identify a sustainable operating range.
• Low-Noise System Review – Motor noise, mounting resonance, coupling alignment, and gearbox behavior are considered as part of the complete assembly.
• Gearbox and Actuator Matching – Transmission ratio, startup torque, output speed, and reflected load can be reviewed before selecting the final configuration.
• Cost-Effective Alternative to Premium Brands – BODENMOTION provides a practical option for OEM teams seeking a customizable coreless motor platform without premium-brand procurement costs.
• Prototype Validation Support – Samples can be tested under the actual controller, load profile, mounting structure, and duty cycle before volume production.

Customer Feedback

Germany | Industrial Automation Integrator
Application: compact valve adjustment module
Feedback: The 24V winding matched the existing control platform while the narrow motor diameter simplified installation inside the actuator housing.

Japan | Precision Instrument Manufacturer
Application: automated optical adjustment mechanism
Feedback: Smooth low-inertia response improved fine movement during repeated positioning cycles without requiring a larger motor frame.

United States | Laboratory Equipment OEM
Application: sample-handling drive assembly
Feedback: The motor provided the required speed range while keeping the completed mechanism quieter than the previous geared drive design.

Downloads – Datasheet

[BDCM1331 Coreless Precious Metal Brushed DC Motor Specification PDF]

FAQ – BDCM1331 Industrial Automation Motor

Q1: Why does the 24V version have different output characteristics from the other windings?

A1: Each suffix uses a different winding design, which changes resistance, torque constant, speed constant, current, and output characteristics. The 24V version should be treated as a distinct configuration rather than as the same motor operated at a higher voltage.

Q2: Why can the completed automation mechanism be louder than the specified 38 dB?

A2: The datasheet figure applies to the motor under specified test conditions. Mounting resonance, gear contact, coupling misalignment, enclosure vibration, and the driven load can increase system-level acoustic output.

Q3: Is the maximum-output operating point suitable for continuous use?

A3: Not necessarily. Maximum-output data represents a specific test point with higher current and lower speed than nominal operation. Continuous suitability should be confirmed through temperature, brush-wear, and duty-cycle testing in the final equipment.

Q4: Does BODENMOTION require a minimum order quantity?

A4: There is no strict MOQ for standard evaluation orders. Sample quantities, pilot batches, and production orders can be arranged according to the project stage and customization requirements.

Q5: Is there a shorter Ø13 mm alternative for lower-power equipment?

A5: Yes. The BDCM1320 uses a shorter Ø13 × 20 mm body, weighs 13 g, and belongs to the 1–2W power class. It is more suitable when axial space and system weight are more important than the BDCM1331’s higher output capability.

Contact BODENMOTION – Coreless Motors for Industrial Automation

For automation projects requiring a compact precious-metal brushed motor, BODENMOTION supports configuration selection based on the complete electrical, mechanical, and operating requirements.

What We Can Provide

• Winding Selection Support – Compare voltage, current, speed, and torque characteristics across the four standard versions.
• Automation Load Review – Evaluate startup friction, transmission loss, reflected inertia, and required torque reserve.
• Low-Noise Integration Assessment – Review bracket stiffness, coupling alignment, enclosure resonance, and gearbox-related noise.
• Gearbox and Shaft Matching – Coordinate the motor with the required output speed, actuator structure, and mechanical connection.
• Prototype Operating Tests – Check current, speed, temperature, noise, and brush behavior under the actual duty cycle.
• OEM Production Support – Assist with samples, pilot quantities, approved configurations, and stable long-term supply.

📧 Email: info@bodenmotion.com
🌐 Website: https://bodenmotion.com