16mm Coreless Brushed DC Motor 3.7–24V Miniature DC Motor 40dB Quiet | BDCM1625 BODENMOTION

Overview of BDCM1625 16mm Coreless Brushed DC Motor

The BDCM1625 16mm coreless brushed DC motor combines a low-inertia coreless rotor with precious-metal brush commutation, delivering smooth response, low-noise operation, and straightforward DC control in a compact Ø16 × 25 mm package.

Available in 3.7V, 6V, 12V, and 24V windings, it is well suited to miniature automation, medical and laboratory equipment, optical mechanisms, and other space-constrained OEM motion systems. Optional gearbox and encoder configurations support geared and feedback-controlled applications.

Key Features of BDCM1625 Miniature DC Motor

• Compact Ø16 × 25 mm Package – Keeps the motor footprint small enough for miniature mechanisms while providing more torque capability than smaller-diameter brushed platforms.
• 3.7–24V Winding Selection – Four winding options cover low-voltage battery systems through 24V embedded DC architectures.
• Rated Torque up to 3.0 mN·m – Provides useful torque for compact adjustment, actuation, and transmission mechanisms without requiring a larger motor frame.
• High-Efficiency Winding Options – Maximum efficiency reaches 82.8% on the 24V version and 82.7% on the 6V version at their respective optimized operating points.
• 40 dB Typical Noise Level – Precious-metal brush commutation and the coreless rotor architecture support quieter operation in compact equipment.
• Smooth Low-Inertia Response – Rotor inertia of 0.90 g·cm² supports responsive acceleration and speed changes in start-stop mechanisms.
• Optional Gearbox or Encoder – A planetary gearbox and photoelectric or magnetoelectric encoder can be added when the application requires torque multiplication or feedback capability.

Technical Specifications of BDCM1625 16mm Coreless Brushed DC Motor

Each model suffix represents a separate winding configuration. Voltage, current, speed, torque, and resistance should therefore be evaluated as a complete operating set rather than treating the same motor winding as interchangeable across different supply voltages.

Motor Model	Unit	BDCM1625-01	BDCM1625-02	BDCM1625-03	BDCM1625-04
At Nominal
Nominal Voltage	V/DC	3.7	6	12	24
Nominal Speed	rpm	6,800	7,840	8,640	8,800
Nominal Current	A	0.67	0.50	0.27	0.15
Nominal Torque	mN·m	2.5	2.8	2.7	3.0
Free Load
No-load Speed	rpm	8,500	9,800	10,800	11,000
No-load Current	mA	50	20	15	6
At Max. Efficiency
Maximum Efficiency	%	76.4	82.7	79.7	82.8
Speed	rpm	7,565	8,967	9,774	10,065
Current	A	0.39	0.22	0.14	0.07
Torque	mN·m	1.39	1.19	1.28	1.29
At Max. Output Power
Maximum Output Power	W	2.82	3.59	3.81	4.37
Speed	rpm	4,250	4,900	5,400	5,500
Current	A	1.60	1.23	0.66	0.37
Torque	mN·m	6.34	6.99	6.74	7.58
At Stall
Stall Current	A	3.15	2.43	1.30	0.74
Stall Torque	mN·m	12.7	14.0	13.5	15.2
Motor Constants
Terminal Resistance	Ω	1.17	2.47	9.23	32.43
Terminal Inductance	mH	0.105	0.210	0.510	1.320
Torque Constant	mN·m/A	4.09	5.80	10.49	20.67
Speed Constant	rpm/V	2,297.3	1,633.3	900.0	458.3
Speed/Torque Constant	rpm/mN·m	670.3	701.3	801.4	725.2
Mechanical Time Constant	ms	6.3	6.6	7.5	6.8
Rotor Inertia	g·cm²	0.90	0.90	0.90	0.90
Number of Pole Pairs	—	1	1	1	1
Number of Phases	—	5	5	5	5
Weight	g	24	24	24	24
Typical Noise Level	dB	≤40	≤40	≤40	≤40

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

Motor Model Number Breakdown

Mechanical Design & Installation Notes for BDCM1625 Precious Metal Brush Motor

The BDCM1625 is intended for compact mechanisms, so shaft alignment and load direction become important when the motor is integrated with gears, cams, pulleys, or couplings.

Axial and Radial Loading
The sintered metal bearing supports a maximum dynamic axial load of 0.5 N and a maximum radial load of 1.5 N, measured 5 mm from the flange. External support should be considered when the transmission creates significant side loading.

Bearing Clearance
Axial play is specified at 0.05–0.15 mm, while radial play is limited to 0.012 mm. Accurate alignment helps prevent additional vibration, uneven bearing loading, and unnecessary brush stress.

Noise After Installation
The 40 dB specification represents typical motor-level acoustic performance. Brackets, enclosures, gears, and coupling misalignment can amplify vibration, so system-level noise should be checked after final assembly.

Operating Temperature
The specified ambient temperature 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.

Duty-Cycle Control
Repeated starts, frequent reversing, and operation near maximum-output current can accelerate brush wear and heat accumulation. Continuous and intermittent load profiles should therefore be evaluated separately.

OEM Customization Options for BDCM1625 Coreless Gear Motor

The BDCM1625 can be adapted from a direct-drive miniature motor into a geared or feedback-enabled drive platform according to the application requirements.

Customization Item	Available Options / Description
Winding Version	3.7V, 6V, 12V, or 24V standard winding
Planetary Gearbox	Optional for lower output speed and higher transmitted torque
Encoder Option	Optional photoelectric or magnetoelectric encoder
Shaft Configuration	Shaft geometry and length can be reviewed for the driven mechanism
Wiring / Lead Length	Electrical connection arrangement can be adapted to equipment layout
Connector Type	Connector selection can be reviewed according to the controller or harness
Mounting Interface	Mechanical adaptation can be evaluated for the OEM assembly
Prototype Combination	Motor, gearbox, and optional encoder can be evaluated together before production

The encoder and gearbox are optional configurations, not standard components of the base motor.

Application Fields of BDCM1625 Miniature DC Motor

The BDCM1625 fits OEM equipment where compact size, simple brushed control, and moderate torque must work together within a limited mechanical envelope.

• Miniature Automation Actuators – Powers indexing, adjustment, locking, and small linear-motion assemblies when paired with a suitable transmission.
• Portable Medical & Laboratory Devices – Provides compact internal motion where low weight and straightforward DC control simplify equipment design.
• Optical Adjustment Mechanisms – Drives focusing, aperture, calibration, and alignment functions requiring smooth incremental movement.
• Compact Pump and Valve Modules – Supplies rotational input for miniature fluid-handling mechanisms with moderate load requirements.
• Smart Equipment Drives – Supports small feeders, latches, sliders, and internal adjustment mechanisms.
• Geared Positioning Modules – Combines with the optional planetary gearbox and encoder when lower speed, increased torque, or feedback is required.

Why Choose BODENMOTION for Your 16mm Coreless Brushed DC Motor Project

Selecting a miniature brushed motor involves more than matching dimensions. Low-voltage current demand, gearbox losses, brush wear, mounting resonance, and the actual operating cycle can all change the performance seen in the finished mechanism.

• 3.7–24V Winding Matching – We help compare voltage versions according to battery or power-supply architecture, allowable current, speed, and torque requirements.
• Brush and Duty-Cycle Evaluation – Start-stop frequency, reversing, operating duration, and current peaks can be reviewed against expected service life.
• Gearbox Ratio Selection – Motor speed, required actuator speed, transmission efficiency, and torque reserve are considered together for geared applications.
• Noise-Sensitive Integration Review – Mounting stiffness, coupling alignment, gear noise, and enclosure resonance can be considered alongside the motor’s acoustic performance.
• Cost-Effective Alternative to Premium Brands – BODENMOTION provides a practical miniature coreless motor platform for OEM projects requiring flexible configuration and competitive sourcing.
• Prototype Validation Support – Motor-only, geared, and encoder-assisted configurations can be evaluated under the actual load before production approval.

Customer Feedback

Germany | Laboratory Equipment Manufacturer
Application: compact sample adjustment module
Feedback: The Ø16 × 25 mm motor fit within the existing enclosure while providing smooth motion for repeated adjustment cycles.

Japan | Precision Equipment OEM
Application: miniature geared positioning mechanism
Feedback: The planetary gearbox allowed the motor speed to be reduced to the required actuator range without increasing the basic motor diameter.

United States | Portable Device Developer
Application: battery-powered internal actuator
Feedback: The low-voltage winding options simplified power-system matching during prototype development while keeping the overall drive assembly compact.

Downloads – Datasheet

[BDCM1625 16mm Coreless Precious Metal Brushed DC Motor Specification PDF]

FAQ – BDCM1625 Coreless Gear Motor

Q1: Why can the actual motor speed be lower than the rated value after a gearbox or mechanism is connected?

A1: The driven mechanism introduces load torque, bearing friction, gearbox losses, and possible voltage drop. Rated motor speed therefore should not be treated as the final actuator speed; the complete transmission and operating load must be considered.

Q2: Is the encoder included with the standard BDCM1625?

A2: No. Photoelectric and magnetoelectric encoders are optional components. The standard motor can be used without an encoder, while feedback can be added when the application requires speed or position monitoring.

Q3: Which winding is more suitable for a battery-powered product?

A3: The correct choice depends on the available battery voltage, current capability, required speed, and load. The 3.7V version fits lower-voltage architectures, while higher-voltage windings operate with different current and torque characteristics and may better match regulated DC systems.

Q4: Does BODENMOTION offer volume discounts?

A4: Yes. Volume pricing is available for OEM orders, with the final quotation depending on quantity, customization requirements, and production configuration.

Q5: Is there a similar precious-metal brushed motor with a slightly shorter body?

A5: Yes. The BDCM1524 uses a Ø15 × 24 mm motor body and belongs to the 2–4W power class. It is a useful alternative when installation size and lower power demand are more important than the BDCM1625’s 4–8W platform.

Contact BODENMOTION – 16mm Miniature DC Motor Solutions

For compact OEM mechanisms requiring a precious-metal brushed motor, geared output, or optional feedback, BODENMOTION supports configuration selection around the complete electrical and mechanical system.

What We Can Provide

• Voltage and Winding Selection – Compare 3.7V, 6V, 12V, and 24V versions according to the available power platform.
• Gearbox Matching – Review reduction ratio, target output speed, transmitted torque, and mechanical efficiency.
• Optional Encoder Integration – Evaluate photoelectric or magnetoelectric feedback when speed or position monitoring is required.
• Mechanical Load Review – Assess shaft loading, coupling alignment, installation space, and mounting conditions.
• Duty-Cycle Validation – Test current, temperature, brush behavior, and operating consistency under the actual motion profile.
• OEM Production Support – Support samples, pilot builds, customized configurations, and stable long-term supply.

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