Explore the technical specifications and performance data of the BFN0724SS-01, a premier 24V DC brushless blower designed for medical CPAP applications.
| ITEM | DESCRIPTION |
| Model | BFN0724SS-01 |
| MOTOR TYPE | BLDC 3PHASE / 6PULSE/4POLE |
| RATED VOLTAGE | 24V |
| INPUT CURRENT (FREE AIR)(AVG) | 1.50 (MAX. 1.80) A |
| INPUT POWER(AVG) | 36.0 (MAX. 43.2) W |
| SPEED (FREE AIR) | 31500±10% R.P.M. |
| MAX. AIR FLOW(AT ZERO STATIC PRESSURE) | 18.06 (MIN. 16.25 ) CFM |
| MAX. AIR PRESSURE(AT ZERO AIRFLOW) | 49.936 (MIN. 40.443) cmH2O |
| ROTATION | COUNTERCLOCKWISE(VIEW FROM INLET PLATE SIDE) |
| ACOUSTICAL NOISE BLOWER PLACE ON 1mm THICK RUBBER PLATE AND 10cm THICK FOAM MATERIAL. THE INLET AND OUTLET OF BLOWER ARE BLOCKED. MICROFONE IN 0.5M DISTANCE ABOVE THE CENTER ON THE PLUG SIDE AT NOMINAL SPEED OF ABOUT 17300RPM. | 38.0 (MAX.42.0) dBA |
P@Q curve
DIMENSION DRAWING
MOTOR PHASE SCEQUENCE
MOTOR DATA
| MOTOR TYPE | BLDC 3 PHASE/6PULSE/4POLE |
| SENSOR SUPPLY RANGE | 4.5-24 V |
| SENSOR SUPPLY CHARGING RATE | 24@Vcc=12V |
| SENSOR OUTPUT | UDS(SAT)=<0.5V, IDMAX=20mA (OPEN DRAIN) |
| MOTOR DATA WITH CONTROLL BOARD | CONTROLL BOARD P/N:5509562627 |
| NOMINAL SUPPLY VOLTAGE | 24V |
| NOMINAL SPEED | 30000 ±15% RPM |
| NOMINAL TORQUE | 10 mNm |
| NOMINAL CURRENT | 1.8±15% A |
| NOMINAL OUTPUT POWER | 32.0 W |
| NO-LOAD SPEED | 38000±15% RPM |
| NO-LOAD CURRENT | 0.20±25% A |
| MAX. PERMISSIBLE STARTING TORQUE | 50 mNm |
| MAX. PERMISSIBLE STARTING CURRENT | 7.5 A |
| INDUCED VOLTAGE | 0.63±7% V/1000min-1 |
| TERMINAL INDUCTANCE(AT 1KHz , 1V) | 0.22±15% mH |
| TERMINAL RESISTANCE | 1.98 ±10% Ω |
| DIRECTION ROTATION | CCW |
| OPERATING TEMPERATURE RANGE | 0~40 ℃ |
| MASS | 0.200±10% Kg |
| ROTOR INTERIA | 1.183 X 10-6 Kgm2 |
| INSTALLATION ABOVE SEA LEVEL | <1000M |
NTC DATA
BFN0724SS-01: Engineering the Silent Heart of CPAP Machines with Advanced NTC Protection
In the medical device industry, particularly for CPAP (Continuous Positive Airway Pressure) machines, the blower is more than just a component—it is the "heart" of the system. The BFN0724SS-01 is a high-performance brushless DC blower engineered to meet the dual demands of medical-grade quietness and fail-safe reliability.
1. Mastering Silence: How the BFN0724SS-01 Eliminates CPAP Noise
For patients using CPAP therapy, sleep quality is the ultimate priority. Any mechanical whine or air turbulence can lead to non-compliance with treatment. The BFN0724SS-01 achieves an ultra-low noise level of 38.0 dBA (at 17,300 RPM) through three core technologies:
• 3-Phase BLDC Architecture: Unlike standard single-phase motors, our 3-phase, 6-pulse design significantly minimizes torque ripple. This results in smoother rotation and eliminates the low-frequency electromagnetic hum often found in cheaper blowers.
• Precision Dynamic Balancing: Operating at speeds up to 31,500 RPM, even a micro-gram of imbalance can cause intrusive high-pitched vibrations. Every unit undergoes rigorous dynamic balancing to ensure "whisper-quiet" operation even at high pressures.
• Aero-Acoustic Optimization: The housing is sculpted to streamline airflow, reducing turbulence at the inlet and outlet. This ensures that the air delivered to the patient is not only stable in pressure but also silent in delivery.
2. The Science of Safety: NTC Thermistor Protection Explained
Safety in medical environments is non-negotiable. The BFN0724SS-01 integrates a Negative Temperature Coefficient (NTC) thermistor to provide a sophisticated thermal management layer.
How the NTC Protection Works:
• Real-Time Thermal Feedback: The NTC sensor’s resistance decreases as the motor temperature rises. This analog signal is constantly monitored by the control board (P/N: 5509562627).
• Closed-Loop Safety: If the blower experiences a stall (locked rotor), air path blockage, or extreme ambient heat, the control system detects the resistance drop and immediately throttles the speed or shuts down the motor to prevent permanent damage.
Why This Matters for Medical Applications:
• Device Longevity: By preventing over-temperature states, the NTC sensor dramatically extends the MTBF (Mean Time Between Failures) of the blower, protecting the manufacturer's warranty and reputation.
• Patient Comfort: Accurate thermal monitoring ensures that the air being delivered to the patient never exceeds safe temperature thresholds, preventing dryness or irritation in the airway.
Technical Summary for Engineers
| Feature | Benefit |
| 38.0 dBA Noise Level | Ensures undisturbed patient sleep. |
| Integrated NTC Sensor | Provides real-time hardware-level thermal protection. |
| 49.936 cmH2O Pressure | Delivers the high static pressure required for effective CPAP therapy. |
| Compact 200g Mass | Ideal for portable and bedside medical devices. |
Conclusion
The BFN0724SS-01 is more than a fan; it is a specialized medical solution. By combining whisper-quiet fluid dynamics with the "brain" of NTC thermal protection, it stands as the premier choice for global CPAP and ventilator manufacturers.
You can place order via our online shop on Aliexpress.
