Micro Brushed DC Motor Ø16×40 mm 38 dB Coreless DC Motor | BDCM1640 BODENMOTION

Overview of BDCM1640 Micro Brushed DC Motor

The BDCM1640 micro brushed DC motor uses a slim Ø16 mm diameter with a 40 mm body length, giving OEM designers a longer motor platform without increasing radial installation space. With a 30 g body and typical noise of 38 dB or lower, it is suited to compact mechanisms where quiet operation, simple DC control, and a narrow motor envelope are important.

Four winding versions support 6V, 9V, 12V, and 24V power systems. Rated speed ranges from 6,372 to 11,635 rpm, while rated torque reaches 3.19 mN·m on the 9V version. The platform can also be combined with an optional planetary gearbox or photoelectric / magnetoelectric encoder when the final mechanism requires gearing or feedback.

Key Features of BDCM1640 Coreless DC Motor

• Slim Ø16 × 40 mm Format – Maintains a narrow 16 mm motor diameter while providing a longer axial platform for compact OEM drive assemblies.
• 38 dB Low-Noise Operation – Typical motor noise is specified at ≤38 dB, supporting equipment where acoustic output must be controlled.
• Rated Torque up to 3.19 mN·m – The 9V winding provides the highest rated torque in the series together with the highest rated speed.
• 6–24V Winding Choices – 6V, 9V, 12V, and 24V versions allow the motor to be matched to different battery and regulated DC architectures.
• Up to 81.2% Maximum Efficiency – The 6V version reaches the highest measured efficiency at its optimized operating point.
• Simple Two-Wire Brushed Control – Precious-metal brush commutation enables straightforward Vcc / GND integration without a three-phase motor driver.
• Optional Gearbox and Encoder – Planetary gearing and photoelectric or magnetoelectric encoder options extend the platform into geared or feedback-assisted motion systems.

Technical Specifications of BDCM1640 Micro Brushed DC Motor

The four versions use different winding designs. Supply voltage, operating current, speed, torque constant, and load requirements should therefore be considered together when choosing the final motor.

Motor Model	Unit	BDCM1640-01	BDCM1640-02	BDCM1640-03	BDCM1640-04
At Nominal
Nominal Voltage	V/DC	6	9	12	24
Nominal Speed	rpm	9,847	11,635	6,372	6,489
Nominal Current	A	0.47	0.54	0.14	0.07
Nominal Torque	mN·m	2.20	3.19	1.92	1.87
Free Load
No-load Speed	rpm	11,002	13,000	7,120	7,250
No-load Current	mA	40	50	15	13
At Max. Efficiency
Maximum Efficiency	%	81.2	80.3	78.6	72.5
Speed	rpm	9,902	11,700	6,408	6,525
Current	A	0.446	0.516	0.131	0.071
Torque	mN·m	2.1	3.0	1.8	1.8
At Max. Output Power
Maximum Output Power	W	6.0	10.3	3.4	3.4
Speed	rpm	5,501	6,500	3,560	3,625
Current	A	2.1	2.4	0.6	0.3
Torque	mN·m	10.5	15.2	9.2	8.9
At Stall
Stall Current	A	4.10	4.70	1.17	0.59
Stall Torque	mN·m	20.9	30.4	18.4	17.8
Motor Constants
Terminal Resistance	Ω	1.46	1.91	10.26	40.68
Terminal Inductance	mH	0.073	0.071	0.452	1.75
Torque Constant	mN·m/A	5.11	6.47	15.68	30.23
Speed Constant	rpm/V	1,833.7	1,444.4	593.3	302.1
Speed/Torque Constant	rpm/mN·m	525.5	427.6	388.0	406.1
Mechanical Time Constant	ms	7.22	6.15	5.28	5.32
Rotor Inertia	g·cm²	1.31	1.32	1.30	1.23
Number of Pole Pairs	—	1	1	1	1
Number of Phases	—	5	5	5	5
Weight	g	30	30	30	30
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 BDCM1640 Low Noise Coreless Motor

For a low-noise motor, final acoustic performance depends heavily on how the motor is mounted and loaded. The coupling, bracket, gearbox, and surrounding housing can introduce vibration that is not represented by the motor-level noise specification.

Radial and Axial Loading
Maximum dynamic axial load is 0.5 N, while maximum radial load is 5 N measured 5 mm from the flange. Gears, pulleys, or offset couplings should be arranged so excessive side loading is not transferred to the motor shaft.

Mechanical Clearance
Axial play is specified at 0.05–0.15 mm, and radial play is limited to 0.012 mm. Accurate shaft alignment helps reduce additional friction and vibration.

Press-Fit Control
Maximum static press-fit force is 15 N. Installation force should be applied through the appropriate structural surfaces rather than through the output shaft.

Noise-Sensitive Mounting
A rigid mounting structure can improve positional stability but may also transmit vibration into the equipment enclosure. Prototype testing should therefore evaluate the complete assembled mechanism rather than the unloaded motor alone.

Operating Environment
The motor is specified for ambient temperatures from −20°C to +80°C, relative humidity below 90% at 25°C, and rotor temperatures up to 125°C.

Current Margin
The lower-voltage windings require higher operating and peak current. Wiring, switches, connectors, and the DC source should be sized according to the selected winding and actual load cycle.

OEM Customization Options for BDCM1640 Precious Metal Brush Motor

The BDCM1640 can be adapted around the required power platform, transmission design, feedback method, and installation constraints of the OEM system.

Customization Item	Available Options / Description
Winding Version	6V, 9V, 12V, or 24V configuration
Planetary Gearbox	Optional for reduced output speed and increased transmitted torque
Encoder Option	Optional photoelectric or magnetoelectric encoder
Operating Point	Winding selection based on target speed, torque, current, and duty cycle
Shaft Configuration	Shaft dimensions and geometry can be reviewed for the driven mechanism
Wiring / Lead Length	Connection arrangement can be adapted to the equipment layout
Connector Type	Connector requirements can be reviewed for the OEM harness
Mounting Interface	Mechanical adaptation can be evaluated for the final assembly
Prototype Combination	Motor, gearbox, and optional encoder can be evaluated together before production

The gearbox and encoder are optional additions to the base motor configuration.

Application Fields of BDCM1640 Coreless DC Motor

The BDCM1640 is well suited to mechanisms that can accommodate a 40 mm motor length and benefit from low acoustic output, simple brushed control, and moderate torque.

• Precision Adjustment Systems – Drives focusing, calibration, alignment, and fine adjustment mechanisms where smooth and quiet motion is useful.
• Laboratory & Analytical Equipment – Powers sample-handling and internal motion functions inside enclosed instruments.
• Compact Industrial Actuators – Provides rotary input for small valves, locks, indexing systems, and linkage mechanisms.
• Medical Equipment Modules – Supports internal electromechanical movement where compact diameter and controlled noise are relevant.
• Miniature Pump & Valve Drives – Provides rotational power for compact fluid-control mechanisms with moderate load demand.
• Geared Positioning Assemblies – Can be combined with the optional planetary gearbox and encoder for lower-speed or feedback-assisted motion.

Why Choose BODENMOTION for Your Micro Brushed DC Motor Project

The BDCM1640 is particularly useful when a narrow motor diameter must be retained but the application can accept a longer motor body. Selecting the correct winding still requires balancing speed, current, torque, noise, and the required duty cycle.

• Low-Noise Integration Review – Motor noise is evaluated together with mounting resonance, gearbox behavior, coupling alignment, and enclosure structure.
• 6–24V Winding Matching – We help compare voltage versions according to the available DC supply, current limit, target speed, and torque requirement.
• Real-Load Current Assessment – Nominal, maximum-output, startup, and stall-current conditions are considered when sizing wiring and drive electronics.
• Gearbox and Feedback Matching – Planetary gearbox and encoder options can be added only when the mechanism needs lower speed, additional torque, or feedback.
• Cost-Effective Alternative to Premium Brands – BODENMOTION provides a configurable coreless brushed motor platform for OEM teams seeking practical alternatives to premium motor suppliers.
• Prototype Validation Support – Current, speed, temperature, noise, and mechanical behavior can be evaluated under the actual operating cycle before volume production.

Customer Feedback

Germany | Analytical Equipment Manufacturer
Application: internal sample positioning mechanism
Feedback: The narrow Ø16 mm motor frame simplified installation while the low acoustic output helped keep additional equipment noise under control.

Japan | Precision Instrument OEM
Application: optical adjustment drive
Feedback: The longer motor platform provided sufficient performance margin without requiring an increase in the diameter of the existing mechanical housing.

United States | Automation Equipment Developer
Application: compact geared actuator
Feedback: The optional gearbox allowed the output speed to be reduced for the mechanism while retaining the same 16 mm motor platform.

Downloads – Datasheet

[BDCM1640 Micro Precious Metal Brushed Coreless DC Motor Specification PDF]

FAQ – BDCM1640 Micro Brushed DC Motor

Q1: Why does the 9V version provide more rated torque than the 12V and 24V versions?

A1: Each voltage version uses a different winding design. The 9V version is rated at 3.19 mN·m and 11,635 rpm, while the 12V and 24V versions use different resistance and torque-constant characteristics. Selection should therefore be based on the complete operating point rather than voltage alone.

Q2: Why can system noise exceed the specified 38 dB?

A2: The motor-level specification does not include vibration or acoustic amplification from brackets, housings, couplings, gears, and driven components. Mounting stiffness and alignment should therefore be checked in the assembled system.

Q3: Can the 10.3 W maximum-output point be used continuously?

A3: Not automatically. The 10.3 W value belongs to the 9V version at a 6,500 rpm operating point with 2.4 A current. Continuous suitability should be confirmed through load-cycle, temperature, and brush-life testing.

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 16 mm precious-metal brushed alternative?

A5: Yes. The BDCM1630 uses a shorter Ø16 × 30 mm body and belongs to the same 3–7W product class. It is more suitable when axial installation space is tighter, while the BDCM1640 offers a longer Ø16 × 40 mm mechanical format.

Contact BODENMOTION – Micro Coreless Brushed DC Motor Solutions

For compact OEM mechanisms requiring a narrow precious-metal brushed motor with low acoustic output, BODENMOTION supports selection around the complete electrical, mechanical, and operating requirements.

What We Can Provide

• Winding Selection Support – Compare 6V, 9V, 12V, and 24V versions according to current, speed, torque, and power-system requirements.
• Low-Noise Integration Assessment – Review mounting, coupling, transmission, and enclosure factors that influence final system noise.
• Load and Current Evaluation – Assess startup friction, operating torque, transient current, and power-supply margin.
• Gearbox and Encoder Options – Match optional transmission and feedback components to the actual motion requirement.
• Prototype Performance Testing – Validate speed, current, temperature, noise, and load response under real operating conditions.
• OEM Production Support – Support sample evaluation, pilot builds, customized configurations, and stable long-term supply.

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