Coreless Brushed Motor Ø28×45 mm 35.71 W Industrial DC Motor | BDCB2845 BODENMOTION

Overview of BDCB2845 Coreless Brushed Motor

The BDCB2845 coreless brushed motor moves into a distinctly heavier-duty class than the smaller BDCB platforms, using a Ø28 × 45 mm graphite brushed construction to support higher torque, greater shaft loading, and broader industrial voltage requirements. Rated torque reaches 17.90 mN·m, while the motor body weighs 145 g, making it better suited to mechanisms where output capability matters more than minimum size or weight.
The platform is available in 6V, 12V, 24V, and 48V windings. Rated speed remains within 6,942–7,565 rpm across the four versions, while the 24V model reaches 35.71W maximum output power and the 48V version provides 17.90 mN·m rated torque with only 0.37 A nominal current. This gives OEM engineers several ways to trade voltage, current, torque, and driver requirements without changing the basic mechanical envelope.

Key Features of BDCB2845 High Torque Coreless Motor

• High Rated Torque – Rated torque reaches 17.90 mN·m, giving the motor more direct-drive capability for industrial mechanisms with heavier loads.
• Up to 35.71W Maximum Output – The 24V winding reaches the highest measured output power, providing useful short-duration performance margin under properly controlled conditions.
• 6–48V Operating Range – Four winding versions cover low-voltage DC systems through 48V industrial power architectures.
• Strong Mechanical Load Capacity – The bearing system supports up to 2 N dynamic axial load and 20 N radial load, making the motor better suited to larger couplings and transmission components.
• Up to 81.6% Maximum Efficiency – The 6V winding reaches the highest measured efficiency at its optimized operating point.
• Graphite Brush Durability – The graphite brush system supports repeated-duty applications where longer brush service is required.
• 40 dB Typical Noise Level – Despite the larger 28 mm frame and higher output class, typical acoustic output remains specified at 40 dB or lower.
• Gearbox, Encoder, and Brake Options – Planetary gearbox, photoelectric encoder, magnetoelectric encoder, and brake options allow the motor to be developed into a more complete industrial actuator platform.

Technical Specifications of BDCB2845 Industrial DC Motor

The four winding versions maintain a similar rated speed range but differ considerably in current demand, torque constant, resistance, and available torque. Selection should therefore begin with the available DC bus and driver capacity, then confirm the required mechanical operating point.

Motor Model	Unit	BDCB2845-01	BDCB2845-02	BDCB2845-03	BDCB2845-04
At Nominal
Nominal Voltage	V/DC	6	12	24	48
Nominal Speed	rpm	6,942	7,476	7,565	7,298
Nominal Current	A	1.89	1.29	0.74	0.37
Nominal Torque	mN·m	12.69	15.85	17.65	17.90
Free Load
No-load Speed	rpm	7,800	8,400	8,500	8,200
No-load Current	mA	150	120	75	45
At Max. Efficiency
Maximum Efficiency	%	81.6	80.0	79.1	77.0
Speed	rpm	7,098	7,602	7,650	7,298
Current	A	1.577	1.135	0.678	0.370
Torque	mN·m	10.38	13.69	16.05	17.90
At Max. Output Power
Maximum Output Power	W	23.55	31.68	35.71	34.93
Speed	rpm	3,900	4,200	4,250	4,100
Current	A	8.075	5.460	3.088	1.523
Torque	mN·m	57.668	72.038	80.227	81.351
At Stall
Stall Current	A	16.00	10.80	6.10	3.00
Stall Torque	mN·m	115.3	144.1	160.5	162.7
Motor Constants
Terminal Resistance	Ω	0.38	1.11	3.93	16.00
Terminal Inductance	mH	0.030	0.120	0.420	1.800
Torque Constant	mN·m/A	7.28	13.49	26.63	55.06
Speed Constant	rpm/V	1,300.0	700.0	354.2	170.8
Speed/Torque Constant	rpm/mN·m	67.6	58.3	53.0	50.4
Mechanical Time Constant	ms	7.53	7.00	6.49	6.73
Rotor Inertia	g·cm²	10.63	11.47	11.69	12.75
Number of Pole Pairs	—	1	1	1	1
Number of Phases	—	5	5	5	5
Weight	g	145	145	145	145
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 BDCB2845 Graphite Brush Motor

The larger Ø28 mm frame and higher torque capability allow the BDCB2845 to work with more substantial mechanical loads, but the transmission should still be designed so the motor bearings are not used as structural supports for the entire mechanism.

Higher Shaft Load Capability
Maximum dynamic axial load is 2 N, while maximum radial load is 20 N measured 5 mm from the flange. These limits provide more mechanical margin than smaller coreless motors but should not be treated as recommended continuous design loads.

Bearing Clearance
Axial play is specified at 0–0.1 mm, and radial play is limited to 0.015 mm. Gear, pulley, and coupling alignment should be controlled to prevent unnecessary side loading.

Transmission Support
For higher-torque industrial assemblies, external bearings or supported gearbox outputs may be appropriate when significant radial or overhung loads are expected.

Thermal Environment
The specified 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 125°C.

High-Current Low-Voltage Versions
The 6V winding draws 1.89 A at nominal conditions and can reach 16 A at stall. Power connectors, wiring resistance, switching devices, and supply impedance should therefore be considered carefully in low-voltage designs.

Brake Integration
A brake is available as an optional component for applications that require holding, stopping, or controlled position retention after motor power is removed.

OEM Customization Options for BDCB2845 Coreless Brushed Motor

The BDCB2845 can be configured from a direct brushed motor into a geared, feedback-enabled, or braking drive assembly according to the application architecture.

Customization Item	Available Options / Description
Winding Version	6V, 12V, 24V, or 48V standard winding
Planetary Gearbox	Optional for lower speed and higher transmitted torque
Encoder Option	Optional photoelectric or magnetoelectric encoder
Brake Option	Optional brake for holding or stopping functions
Shaft Configuration	Shaft geometry and length can be reviewed for the transmission
Wiring / Lead Length	Electrical connection arrangement can be adapted to equipment layout
Connector Type	Connector can be selected according to the OEM power and control harness
Mounting Interface	Mechanical interface can be reviewed for the actuator assembly
Prototype Combination	Motor, gearbox, encoder, and brake combinations can be evaluated before production

Gearbox, encoder, and brake configurations are optional rather than standard components of the base motor.

Application Fields of BDCB2845 Industrial DC Motor

The BDCB2845 is better suited to higher-load OEM systems where a small precision motor is no longer sufficient, but the application still benefits from a compact coreless brushed architecture.

• Industrial Actuators – Drives valves, dampers, clamps, and linkage systems requiring higher torque and stronger shaft-load capability.
• Robotic Auxiliary Axes – Provides motion for grippers, tool changers, rotary modules, and secondary axes where a brushed control architecture is acceptable.
• Automation Handling Equipment – Powers feeders, indexing mechanisms, rollers, and positioning assemblies with higher mechanical loads.
• Medical & Laboratory Machinery – Supports larger internal mechanisms requiring controlled speed and relatively low acoustic output.
• Powered Adjustment Systems – Drives seats, platforms, optical assemblies, or industrial adjustment mechanisms when paired with suitable gearing.
• Brake-Assisted Geared Drives – Can be configured with gearbox, encoder, and brake for applications requiring lower speed, feedback, and position holding.

Why Choose BODENMOTION for Your High Torque Coreless Motor Project

At this output level, motor selection increasingly becomes a system-design problem. Power-supply capacity, gearbox efficiency, peak load, shaft forces, braking requirements, and brush duty cycle can all determine whether the motor performs reliably in the finished equipment.

• High-Torque Operating-Point Review – Rated torque, transient demand, startup friction, and transmission losses are evaluated together rather than selecting from stall torque alone.
• 6–48V Power-System Matching – We help compare low-voltage high-current and higher-voltage lower-current configurations according to the equipment power architecture.
• Mechanical Load Assessment – Shaft loading, coupling design, external support, and gearbox output structure can be reviewed for heavier industrial mechanisms.
• Encoder and Brake Integration – Feedback and holding functions can be added only when required by the control and safety architecture.
• Cost-Effective Alternative to Premium Brands – BODENMOTION provides a configurable graphite brushed motor platform for OEM teams seeking practical alternatives to premium industrial motor suppliers.
• Prototype Validation Under Real Load – Current, torque, temperature, gearbox behavior, brake operation, and duty cycle can be verified before volume production.

Customer Feedback

Germany | Industrial Automation Manufacturer
Application: heavy-duty valve actuator
Feedback: The higher torque capability allowed the team to increase actuator load margin while retaining a compact cylindrical drive assembly.

Japan | Robotics Equipment OEM
Application: powered gripper mechanism
Feedback: The 24V winding provided the required torque while keeping nominal current manageable for the existing control cabinet and wiring architecture.

United States | Industrial Machinery Developer
Application: geared positioning and holding module
Feedback: Combining the motor with gearbox, encoder, and brake options simplified development of a compact drive that required both controlled movement and position holding.

Downloads – Datasheet

[BDCB2845 Coreless Graphite Brushed Industrial DC Motor Specification PDF]

FAQ – BDCB2845 Coreless Brushed Motor

Q1: Should the 35.71 W value be treated as the motor’s continuous power rating?

A1: No. The 35.71 W figure belongs to the 24V winding at its maximum-output operating point, where speed is 4,250 rpm and current rises to 3.088 A. Continuous operation should be selected according to thermal limits, brush life, and the actual duty cycle.

Q2: Why would an OEM choose the 48V version instead of the 24V version?

A2: The 48V winding reduces nominal current to 0.37 A while providing 17.90 mN·m rated torque. It can therefore be useful where a higher-voltage DC bus is already available and lower cable or driver current is desirable.

Q3: When should a brake be added to the motor assembly?

A3: A brake can be considered when the mechanism must hold position after power is removed or requires controlled stopping. The required holding torque, gearbox ratio, load direction, and safety requirements should be reviewed before selecting the brake configuration.

Q4: What payment methods does BODENMOTION accept?

A4: BODENMOTION supports PayPal, credit card, and T/T. Final payment arrangements can be confirmed according to order quantity, customization, and project stage.

Q5: Is there a smaller graphite brushed motor for lower-load applications?

A5: Yes. The BDCB2230 uses a smaller Ø22 × 30 mm structure and belongs to the 3–10W product class. It is more suitable when size and weight matter more than the BDCB2845’s higher torque, shaft-load capability, and 9–35W range.

Contact BODENMOTION – High Torque Industrial DC Motor Solutions

For industrial mechanisms requiring higher brushed-motor torque, broader voltage options, or integrated transmission and feedback functions, BODENMOTION supports selection around the complete mechanical and electrical operating conditions.

What We Can Provide

• 6–48V Winding Selection – Compare current, speed, torque, and driver requirements across the four voltage platforms.
• High-Load Mechanical Review – Evaluate shaft forces, coupling structure, bearing support, gearbox arrangement, and installation constraints.
• Gearbox and Torque Matching – Review reduction ratio, output speed, transmission efficiency, and required torque reserve.
• Encoder and Brake Configuration – Add feedback and holding functions according to the control and safety requirements of the equipment.
• Duty-Cycle & Thermal Validation – Test current, temperature, brush behavior, and load performance under real operating conditions.
• OEM Prototype & Production Support – Support samples, pilot assemblies, customized configurations, and stable long-term production.

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