Low Voltage Coreless Brushed DC Motor Φ12×35mm 3-24V BDCM1235 BODENMOTION

Overview of BDCM1235 Coreless Brushed DC Motor

The BDCM1235 coreless precious metal brushed DC motor is designed for OEM applications requiring low-voltage startup, stable torque delivery, and an extended motor structure. With a Φ12 × 35 mm body and a weight of only 17 g, it provides additional internal space while maintaining the compact dimensions needed for miniature motion systems.

Supporting 3.7V, 6V, 12V, and 24V configurations, the BDCM1235 delivers rated speeds from 8500 to 10350 rpm with a power range of 1–3W. Its precious metal brush system provides smooth operation, low electrical noise, and reliable low-voltage starting performance, making it suitable for portable equipment, precision instruments, and compact OEM drive assemblies.

Key Features of BDCM1235 Low Voltage Coreless Motor

• Coreless Rotor Design – Low rotor inertia enables responsive acceleration and smooth speed regulation.
• Precious Metal Brush System – Supports low electrical noise and reliable startup in low-voltage applications.
• Extended Φ12 × 35 mm Structure – Provides additional internal space while maintaining a compact diameter.
• Low-Voltage Compatibility – Supports 3.7V, 6V, 12V, and 24V platforms for portable and battery-powered equipment.
• Stable Torque Output – Delivers consistent performance for compact precision drive systems.
• Compact Lightweight Construction – Weighs only 17 g, simplifying integration into miniature assemblies.
• Optional Planetary Gearbox – Available for applications requiring lower speed and increased output torque.

Technical Specifications of BDCM1235 Coreless DC Motor

All values are nominal. Actual performance may vary depending on operating load, installation conditions, duty cycle, and power supply characteristics.

Motor Model	Unit	BDCM1235-01	BDCM1235-02	BDCM1235-03	BDCM1235-04
Value at Rated Voltage
At Nominal
Nominal Voltage	V/DC	3.7	6	12	24
Nominal Speed	rpm	8500	9350	10350	10000
Nominal Current	A	0.56	0.40	0.15	0.08
Nominal Torque	mN·m	1.80	1.91	1.26	1.28
Free Load
No-load Speed	rpm	10000	11000	11500	10000
No-load Current	mA	40	30	20	20
At Max. Efficiency
Max. Efficiency	%	79.8	79.3	76.7	66.8
Speed	rpm	8750	9625	10350	9000
Current	A	0.473	0.339	0.148	0.078
Torque	mN·m	1.5	1.6	1.3	1.3
At Max. Output Power
Max. Output Power	W	3.2	3.7	3.8	3.4
Speed	rpm	5000	5500	5750	5000
Current	A	1.8	1.3	0.7	0.3
Torque	mN·m	6.0	6.4	6.3	6.4
At Stall
Stall Current	A	3.5	2.5	1.3	0.60
Stall Torque	mN·m	12.1	12.7	12.6	12.8
Motor Constants
Terminal Resistance	Ω	1.06	2.40	9.23	40.00
Terminal Inductance	mH	0.025	0.006	0.312	1.250
Torque Constant	mN·m/A	3.45	5.08	9.66	21.42
Speed Constant	rpm/V	2702.7	1883.3	958.3	416.7
Speed/Torque Constant	rpm/mN·m	827.5	865.4	915.7	778.2
Mechanical Time Constant	ms	10.5	9.44	7.62	7.38
Rotor Inertia	g·cm²	0.594	0.530	0.545	0.454
Number of Pole Pairs	—	1	1	1	1
Number of Phases	—	5	5	5	5
Weight	g	17	17	17	17
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

Proper installation helps maintain stable operation, minimize vibration, and maximize motor service life during OEM integration.

Extended Motor Structure
The BDCM1235 features a Φ12 × 35 mm cylindrical housing, providing additional internal space while remaining suitable for compact electromechanical assemblies.

Bearing & Shaft Protection
Axial play is 0.05–0.15 mm, radial play is ≤0.012 mm, maximum dynamic axial load is 0.8 N, maximum radial load (5 mm from the flange) is 0.5 N, and maximum press-fit force is 35 N. Proper shaft alignment helps protect bearing life and maintain stable operation.

Operating Environment
Recommended ambient temperature is -20°C to +80°C, with relative humidity below 90% RH (25°C). Maximum rotor temperature should not exceed 85°C.

Optional Gearbox Integration
A planetary gearbox is available for applications requiring lower output speed and higher transmission torque.

OEM Customization Options – BDCM1235 Coreless DC Motor

Customizable parameters are available to support OEM integration and application-specific performance requirements.

Customization Item	Available Options / Description
Voltage	Configurable according to system requirements
Speed Curve	Optimized for different operating conditions
Shaft Type	Straight shaft, D-cut shaft, or custom-machined shaft
Shaft Length	Customized according to installation requirements
Gearbox Option	Optional planetary gearbox
Wiring / Cable Length	Custom lead wire length and routing
Connector Type	Bare wire or customized connector options
Mounting Interface	Mechanical adaptation for OEM assemblies
Brush Configuration	Precious metal brush system optimized for low-voltage applications
Output Terminal	Customized electrical connection solutions

Application Fields of BDCM1235 Compact Motor

From an OEM perspective, the BDCM1235 is suitable for compact equipment requiring reliable low-voltage operation, stable torque output, and lightweight integration.

• Portable Medical Devices – Compact motion systems for battery-powered equipment.
• Laboratory & Analytical Instruments – Precision drive for testing and measurement equipment.
• Industrial Automation – Embedded motion modules in compact automation systems.
• Smart Electronic Devices – Internal drive solutions for miniature electronic products.
• Optical & Precision Equipment – Stable rotational performance for positioning and adjustment mechanisms.

Why Choose BODENMOTION for Your Coreless Motor Project

Portable OEM equipment often requires more than a compact motor. Startup reliability, battery compatibility, installation space, and long-term operating stability all influence overall system performance.

• Battery-Powered System Evaluation – We help review supply voltage, startup current, and load characteristics to improve reliability in low-voltage applications.
• Extended Body Integration Support – The longer motor structure provides additional design flexibility, and shaft, wiring, and mounting configurations can be adapted to fit your assembly.
• Cost-Effective Alternative to Premium Brands – We provide practical replacement options for internationally recognized coreless motor platforms while helping reduce procurement and project costs.
• Compact Motion Optimization – Motor selection is matched to size, weight, torque, and operating requirements to avoid unnecessary design compromises.
• Prototype Validation Assistance – Sample evaluation helps verify startup behavior, operating stability, and mechanical compatibility before production.
• Stable Supply for OEM Programs – Consistent manufacturing supports a smooth transition from prototype approval to long-term volume production.

Customer Feedback

Germany | Portable Device Manufacturer
Application: handheld measurement equipment
Feedback: Reliable low-voltage startup improved battery-powered system performance during field testing.

Japan | Precision Instrument OEM
Application: compact adjustment mechanism
Feedback: The extended motor structure simplified integration while maintaining stable operating characteristics.

United States | Automation Equipment Developer
Application: embedded drive module
Feedback: Smooth operation and compact dimensions reduced development time during prototype validation.

Downloads – Datasheet

[BDCM1235 Coreless Precious Metal Brushed DC Motor Specification (PDF)]

FAQ – BDCM1235 Coreless Motor

Q1: Why does the motor start normally with no load but struggle after assembly?

A1: Startup performance depends on load inertia, transmission efficiency, supply voltage, and mechanical resistance. Even with good low-voltage characteristics, excessive startup load can reduce reliability.

Q2: Is the BDCM1235 suitable for battery-powered equipment?

A2: Yes. It supports a 3.7V configuration, making it suitable for portable and battery-powered applications where compact size and reliable startup are important.

Q3: Why choose the BDCM1235 instead of a shorter precious metal brushed motor?

A3: The extended body provides additional internal design space while maintaining a compact diameter, making it suitable for applications requiring greater structural margin without significantly increasing installation width.

Q4: What is the warranty period for this motor?

A4: BODENMOTION provides a 1-year warranty under normal operating conditions. Damage caused by improper installation, misuse, or operation outside the specified conditions is not covered.

Q5: Is there a shorter alternative available?

A5: Yes. The BDCM1230 is recommended for applications where installation length is more restricted while maintaining the advantages of a coreless precious metal brushed DC motor.

Contact BODENMOTION – OEM Coreless Precious Metal Motor Solutions

If you are developing portable electronic devices, precision instruments, compact automation equipment, or embedded motion systems, BODENMOTION supports your project from motor selection through customization and long-term OEM production.

What We Can Provide

• Application-Oriented Motor Selection – Recommend suitable voltage, speed, torque, and motor configuration based on your system requirements.
• Compact Motor Customization – Customize shafts, wiring, connectors, gearbox options, and mounting interfaces for easier integration.
• Engineering Evaluation Support – Assist with prototype validation, load matching, and system optimization.
• Cost-Effective Replacement Solutions – Help replace established international motor brands while maintaining reliable performance.
• Flexible Sample & Production Supply – Support rapid sampling and stable long-term manufacturing.
• Long-Term Engineering Partnership – Work with your engineering team to improve integration efficiency and accelerate product development.

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