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Outer Rotor BLDC Motor

What is outer rotor bldc motor?

Outer rotor BLDC motors—also known as external rotor brushless DC motors—have become essential components in modern engineering due to their exceptional torque density, smooth operation, and energy-efficient performance. As industries demand compact yet powerful motion solutions, these advanced motor systems offer unparalleled advantages for applications requiring stability, precision, and durability.

An outer rotor BLDC motor is a brushless DC motor in which the rotor rotates around the stator, instead of being located inside it. While conventional BLDC motors feature an internal rotor, the outer rotor configuration flips this structure: the permanent magnets are mounted on the rotating outer shell, and the stator windings remain fixed at the center.

This unique construction provides several performance benefits:

Higher torque per volume
Enhanced inertia for smooth, stable rotation
Improved cooling efficiency
Ultra-low vibration and noise

Because the rotor encompasses the stator, the motor tends to be shorter, wider, and more torque-oriented, making it ideal for direct-drive systems.

Features:

No Brushes – Reduced Maintenance and Increased Lifespan
High Efficiency and Low Power Loss
High Torque-to-Weight Ratio
Precise Speed and Position Control
Quiet and Smooth Operation
Wide Speed Range and Dynamic Performance
Excellent Thermal Management Customizable Designs and Modular Configurations
Multiple Control Methods
Integration with Digital Interfaces and Sensors

JK18BLW Series External Rotor Brushless Bldc DC Motor

Outer Rotor Brushless DC motor, power: 0.25W ~ 1.0W, rated voltage: 5V ~ 12V, rated speed: 600 ~ 10000rpm, rated torque: 1.3mNm ~ 3mNm

Optional parts: Gearbox, brake, encoder, connector...

Model	Driver	Dimension (without shaft)	Rated Voltage	Rated Speed	Rated Current	Rated Power	Holding Torque
Model	/	mm	V	Rpm	A	W	mN.m
JK18BLWD9-5V-009	Built-in	Φ18*9	5	600-3000	0.09	0.45	1.3
JK18BLWD9-5V-015	Built-in	Φ18*9	5	1500-6000	0.15	0.75	2.5
JK18BLW9-5V-015	None	Φ18*9	5	1500-6000	0.15	0.75	2.5
JK18BLWD9-5V-020	Built-in	Φ18*9	5	3000-6000	0.2	1	2.5
JK18BLW9-5V-009	None	Φ18*9	5	600-2000	0.09	0.45	1.3
JK18BLW9-12V-020	None	Φ18*9	12	10000	0.2	2.4	3
JK18BLWD9-3.6V-006	Built-in	Φ18*9	3.6	1700	0.06	0.25	2.5
JK18BLWD9-5V-009	Built-in	Φ18*9	5	600-3000	0.09	0.45	1.3

JK20BLW Series External Rotor Brushless Bldc DC Motor

Outer Runner Brushless DC motor, power: 0.25W ~ 2.4W, rated voltage: 3.6V ~ 12V, rated speed: 2000 ~ 10000rpm, rated torque: 2.5mNm ~ 13mNm

Optional parts: Gearbox, brake, encoder, integrated built-in drivers...

Model	Driver	Dimension (without shaft)	Rated Voltage	Rated Speed	Rated Current	Rated Power	Holding Torque
Model	/	mm	V	Rpm	A	W	mN.m
JK20BLW9-5V-005	None	Φ20*9	5	2000	0.05	0.25	2.5
JK20BLWD9-3.6V-020	Built-in	Φ20*9	3.6	1700	0.2	0.72	4
JK20BLWD9-5V-015	Built-in	Φ20*9	5	2000	0.15	0.75	6
JK20BLW9-12V-020-01	None	Φ20*9	12	10000	0.2	2.4	13
JK20BLW9-12V-020-02	None	Φ20*9	12	10000	0.2	2.4	6.5
JK20BLW9-5V-010	None	Φ20*9	5	3000	0.1	0.5	3
JK20BLW15-5V-020	None	Φ20*15	5	6000	0.2	1	3
JK20BLW9-12V-012	None	Φ20*9	12	2000	0.12	1.5	9

JK30BLW Series External Rotor Brushless Bldc DC Motor

Outer Runner Brushless Bldc DC motor, power: 2.4W ~ 18W, rated voltage: 9V ~ 12V, rated speed: 3000rpm ~ 10000rpm, rated torque: 20Nm ~ 80Nm

Optional parts: Gearbox, brake, encoder, integrated built-in drivers...

Model	Driver	Dimension (without shaft)	Rated Voltage	Rated Speed	Rated Current	Rated Power	Holding Torque
Model	/	mm	V	Rpm	A	W	mN.m
JK30BLW11-12V-020	None	Φ30*11	12	10000	0.2	2.4	60
JK30BLW20-12V-020-01	None	Φ30*20	12	4000	0.2	3	60
JK30BLW20-12V-020-02	None	Φ30*20	12	6000	0.2	3	60
JK30BLW11-12V-150	None	Φ30*11	12	3000	1.5	18	80
JK30BLW11-9V-050	None	Φ30*11	9	6000	0.5	4.5	25
JK30BLW11-12V-030	None	Φ30*11	12	3000	0.3	4	20

JK36BLW Series External Rotor Brushless Bldc DC Motor

Outer Runner Brushless DC motor, power: 1W ~ 80W, rated voltage: 5V ~ 24V, rated speed: 1000rpm ~ 10000rpm, rated torque: 0.055Nm ~ 0.44Nm

Optional parts: gearbox, brake, encoder, integrated built-in drivers...

Model	Driver	Dimension (without shaft)	Rated Voltage	Rated Speed	Rated Current	Rated Power	Holding Torque
Model	/	mm	V	Rpm	A	W	N.m
JK36BLW20-12V-030	None	Φ36*20	12	3000	0.3	3.6	0.12
JK36BLW20-12V-080	None	Φ36*20	12	1000	0.8	10	0.12
JK36BLWD20-12V-170	Built-in	Φ36*20	12	3500	1.7	20	0.3
JK36BLW20-12V-050	None	Φ36*20	12	3000	0.5	6	0.25
JK36BLWD20-24V-100	Built-in	Φ36*20	24	10000	1.0	24	0.15
JK36BLWD20-24V-150	Built-in	Φ36*20	24	800	1.5	36	0.15
JK36BLWD20-12V-150	Built-in	Φ36*20	12	3000	1.5	18	0.3
JK36BLW20-12V-200	None	Φ36*20	12	3500	2	25	0.2
JK36BLWD20-24V-250	Built-in	Φ36*20	24	1000	2.5	60	0.3
JK36BLWD18-12V-150	Built-in	Φ36*18	12	3000	1.5	18	0.3
JK36BLW20-24V-120	None	Φ36*20	24	3000	1.2	30	0.2
JK36BLWD20-24V-300	External drive	Φ36*20	24	10000	3	80	0.2
JK36BLWD20-12V-300	External drive	Φ36*20	12	3000	3	40	0.22
JK36BLW16-24V-150	None	Φ36*16	24	4000	1.5	40	0.35
JK36BLWD20-24V-040	Built-in	Φ36*20	24	2500	0.4	10	0.12
JK36BLWD20-5V-020	Built-in	Φ36*20	5	1300	0.2	1	0.05

JK43BLW Series External Rotor Brushless Bldc DC motor

Brushless DC motor, power: 23W ~ 184W, rated voltage: 36V, rated speed: 4000rpm, rated torque: 0.055Nm ~ 0.44Nm

Optional parts: gearbox, brake, encoder, fan, integrated built-in drivers...

Model	Driver	Dimension (without shaft)	Rated Voltage	Rated Speed	Rated Current	Rated Power	Holding Torque
Model	/	mm	V	Rpm	A	W	N.m
JK43BLW16-12V-150	None	Φ43*16	12	4000	1.5	18	0.4
JK43BLWD20-24V-150	Built-in	Φ43*20	24	10000	1.5	40	0.4
JK43BLW20-24V-150	None	Φ43*20	24	3000	1.5	40	0.45
JK43BLWD16-24V-050	Built-in	Φ43*16	24	500	0.5	12	0.15
JK43BLW20-15V-200	None	Φ43*20	15	3500	2.0	30	0.4
JK43BLW20-24V-250	None	Φ43*20	24	5000	2.5	60	0.45
JK43BLW20-24V-350	None	Φ43*20	24	3500	3.5	60	0.9
JK43BLWD30-7.4V-500	Built-in	Φ43*30	7.4	1000	5.0	40	0.8
JK43BLW30-24V-500	None	Φ43*30	24	3500	5.0	120	0.9
JK43BLWD30-24V-300	External drive	Φ43*30	24	5000	3.0	80	0.9
JK43BLWD30-24V-400	Built-in	Φ43*30	24	4000	4.0	100	0.9
JK43BLW30-24V-100	None	Φ43*30	24	2000	1.0	60	0.5
JK43BLWD30-12V-400	External drive	Φ43*30	12	3500	4.0	50	0.4
JK43BLW30-24V-160	None	Φ43*30	24	3500	1.6	50	0.8
JK43BLWD30-24V-400	Built-in	Φ43*30	24	4000	4.0	100	0.9
JK43BLWD30-24V-400	External drive	Φ43*30	24	1800	4.0	100	0.9
JK43BLW16-24V-350	None	Φ43*16	24	5000	3.5	100	0.7

JK42BLW Series External Rotor Brushless Bldc DC Motor

External Rotor Brushless DC motor, power: 30W ~ 70W, rated voltage: 24V, rated speed: 4840rpm ~ 5260rpm, rated torque: 0.15Nm ~ 0.39Nm

Optional parts: gearbox, brake, encoder, integrated built-in drivers...

Model	Phase No	Poles No	Shaft Dia	Rated Voltage	Max Current	Inductance	Length	Resistance	Rated Power	Max Torque	Weight
Model	Phase	Poles	mm	V	A	mH	mm	Ω	W	N.m	Kg
JK45BLW18-24V-6530A	3	16	4	24	4.8	0.59	18	1.42	30	0.15	0.08
JK45BLW18-24V-7130A	3	16	4	24	4.3	0.59	18	1.42	30	0.15	0.08
JK45BLW21-24V-6750A	3	16	4	24	7.4	0.33	21	0.72	50	0.25	0.12
JK45BLW27-24V-6170A	3	16	4	24	11	0.27	27	0.56	70	0.39	0.15

JK60BLW Series External Rotor Brushless Bldc DC Motor

Outer Runner Brushless DC motor, power: 15W ~ 150W, rated voltage: 12V ~ 24V, rated speed: 1500rpm ~ 4000rpm, rated torque: 0.4Nm ~ 1.8Nm

Optional parts: gearbox, brake, encoder, integrated built-in drivers...

Model	Driver	Dimension (without shaft)	Rated Voltage	Rated Speed	Rated Current	Rated Power	Holding Torque
Model	/	mm	V	Rpm	A	W	N.m
JK60BLWD25-24V-200	Built-in	Φ60* 25	24	3000	2	50	0.7
JK60BLWD25-12V-120	Built-in	Φ60* 25	12	1500	1.2	15	0.4
JK60BLWD20-12V-300	External drive	Φ60* 20	12	3000	3	40	0.5
JK60BLW25-24V-600	None	Φ60* 25	24	3500	6	150	1.8
JK60BLWD25-24V-250	Built-in	Φ60* 25	24	3000	2.5	60	1
JK60BLWD25-12V-200	Built-in	Φ60* 25	12	1200	2	30	0.5
JK60BLWD25-12V-250	Built-in	Φ60* 25	12	2300	2.5	30	0.5
JK60BLWD40-24V-300-01	External drive	Φ60* 40	24	1500	3	100	1.8
JK60BLWD40-24V-300-02	Built-in	Φ60* 40	24	3200	3	60	0.5
JK60BLW40-24V-400	None	Φ60* 40	24	1300	4	100	1.5
JK60BLWD40-24V-500	Built-in	Φ60* 40	24	1800	5	120	1.8
JK60BLWD40-24V-080	Built-in	Φ60* 40	24	1000	0.8	20	0.5
JK60BLWD40-24V-200	Built-in	Φ60* 40	24	4000	2	40	0.5

JK84BLW Series External Rotor Brushless Bldc DC Motor

External Rotor Brushless DC motor, power: 120W ~ 200W, rated voltage: 24V ~ 36V, rated speed: 1000rpm, rated torque: 5Nm ~ 6.5Nm

Optional parts: gearbox, brake, encoder, integrated built-in drivers...

Model	Driver	Dimension (without shaft)	Rated Voltage	Rated Speed	Rated Current	Rated Power	Holding Torque
Model	/	mm	V	Rpm	A	W	N.m
JK84BLW30-24V-600	None	Φ80x30	24	1000	6	150	5
JK84BLWD30-24V-500-01	External drive	Φ80x30	24	1000	5	120	5
JK84BLWD30-24V-500-02	Built-in	Φ80x30	24	1000	5	120	5
JK84BLWD30-24V-500-03	Built-in	Φ80x30	24	1000	5	120	5
JK84BLWD45-24V-500	Built-in with CAN	Φ80x45	24	1000	5	120	5
JK84BLW30-24V-500	None	Φ80x30	24	1000	5	120	5
JK84BLWD30-36V-500	Built-in	Φ80x30	36	1000	5	200	6.5

JK110BLW Series External Rotor Brushless Bldc DC Motor

Outer Runner Brushless DC motor, power: 1000W, rated voltage: 24V, rated speed: 3000rpm, rated torque: 18Nm

Optional parts: gearbox, brake, encoder, integrated built-in drivers...

Model	Driver	Dimension (without shaft)	Rated Voltage	Rated Speed	Rated Current	Rated Power	Holding Torque
Model	/	mm	V	Rpm	A	W	N.m
JK110BLW90-24V-4000	None	110x110x90	24	3000rpm	40	1000	18

How an External Rotor BLDC Motor Works

The internal stator contains the fixed windings. Surrounding it is a cylindrical rotor with permanent magnets attached on the inner surface. When the stator coils are energized in sequence:

A rotating magnetic field is created.
The outer rotor is pulled along and spins smoothly around the stator.
Electronic commutation replaces brushes, improving lifespan and reliability.

Because the rotor is larger and has more moment of inertia, the motor provides stable rotation and efficient low-speed torque.

Key Features of External Rotor BLDC Motors

1. High Torque Density

The large rotor diameter increases leverage, resulting in higher torque output.

2. Extremely Quiet and Low Vibration

Ideal for noise-sensitive environments like medical devices and premium household appliances.

3. Highly Efficient

Brushless design and optimized airflow improve motor efficiency and reduce energy consumption.

4. Compact and Integrated Design

Often designed to mount fan blades directly onto the outer rotor, reducing component count.

5. Long Service Life

No brush wear, reduced heat buildup, and high-quality bearings ensure long operational lifetime.

Applications of External Rotor BLDC Motors

External rotor motors are used anywhere high torque, stability, and quiet operation are required.

1. HVAC and Ventilation Systems

The most common use is in:

Axial fans
Centrifugal blowers
Air purifiers
Heat recovery ventilators (HRV/ERV)
Dehumidifiers

Their ability to drive fan blades directly on the rotor makes them ideal for ventilation systems.

2. Robotics and Automation

Used in:

Conveyor drives
Compact robotic arms
Automated industrial machines
Precision handling equipment

Their smooth motion and stable speed improve control accuracy.

3. Consumer Electronics and Appliances

These motors power:

Smart fans
Air conditioners
Range hood blowers
Vacuum systems
Dryers and air circulators

Consumers appreciate their quiet operation and high efficiency.

4. Electric Mobility

Increasingly used in lightweight vehicles:

Electric bicycles
Electric scooters
Delivery robots
Autonomous small vehicles

High torque at low speed makes them suitable for direct-drive propulsion.

5. Medical and Laboratory Devices

Applications include:

Ventilator fans
Air pumps
Medical cooling systems
Laboratory centrifuge drive fans
Sensitive equipment requiring low vibration

Quiet operation and reliability are essential in medical environments.

6. Data Center and Electronics Cooling

External rotor motors drive:

Server rack cooling fans
Blowers for electronics
Thermal management systems for EV batteries

Efficient, high-performance cooling helps protect sensitive electronics.

Advantages Compared to Internal Rotor BLDC Motors

Feature	External Rotor BLDC	Internal Rotor BLDC
Torque	Higher	Moderate
Noise	Very low	Low
Inertia	High	Lower
Best for	Fans, HVAC, steady motion	High-speed tools, compact drives
Mounting	Easy fan attachment	Requires separate fan/blade mount

External rotor motors excel in torque, smoothness, and quiet performance, while internal rotor motors excel in speed and compactness.

Why Industries Prefer External Rotor BLDC Motors

Energy savings in HVAC systems
Stability under varying loads
Low maintenance due to brushless design
Flexible customization (shape, size, mounting options)
Better thermal dissipation with the rotor acting as a heat sink

These traits make them a strategic choice for energy-efficient systems and modern automated equipment.

Conclusion

External rotor BLDC motors provide a powerful combination of efficiency, stability, high torque, and quiet operation, making them vital in ventilation systems, consumer appliances, robotics, and electric mobility. Their unique design gives them operational advantages that continue to drive widespread adoption across industries.