Brushless DC Railway Carriage Fans (Sensorless) 110V DC, 400MM Sweep Fixed Type
Specification No. RDSO/PE/SPEC/TL/0021/2005(REV ‘3’) with Amendment No. 1
Features:
- Traditional 110 V DC fans with carbon brushes face high maintenance, noise, poor efficiency, and limited lifespan; sensorless BLDC fans are introduced by RDSO to overcome these drawbacks.
- These fans eliminates the need for brushes and sensors, utilizing robust DSP-based inverter control for higher reliability.
- Designed with an aluminum motor housing and replaceable fire-retardant blades for durability and safety.
- Ensures reliable operation with reverse polarity and voltage protection, and withstands voltage ripple and locked rotor conditions.
- Compact, lightweight, and energy-efficient while operating quietly with low noise levels.
Technical Data:
| Performance Metrics | |
|---|---|
| Air Delivery | ≥ 60 m³/min |
| Max Input Power | ≤ 32 W |
| Max Weight | ≤ 7 kg |
| Service Value | ≥ 2 m³/min/W |
| Noise | ≤ 55 dBA |
| System Integration | |
| Application | Designed for fixed-mount applications in passenger coaches |
| Operating Voltage | Operates on 110 V DC, compatible with coach battery systems |
| Control | DSP-controlled inverter with gate drive logic ensures smooth operation |
| Controller | Single controller board for power, protection, and signal generation, with gate driver located near power devices |
| Electrical Interface | |
| Voltage Range | 90–140 V DC with up to 15% ripple |
| Over-voltage Protection | Activates above ~155 V (trips and restarts automatically at ~140 V) |
| Under-voltage Protection | Trips below ~65 V, restarts at ~70 V |
| Surge Withstand | Tested to withstand spikes up to 200 V DC for 2 minutes without damage |
| Mechanical Design Features | |
| Motor Type | Permanent magnet BLDC—compact, lightweight (no field windings, brushes, or commutator) |
| Fan Body | Deep-drawn MS conforming to RDSO drawing RDSO/PE/SK/TL/0025 2002 |
| Motor Body | Aluminum alloy LM 6 |
| Mounting Configuration | 3 holes on a 108 mm PCD, each 9 mm diameter |
| Stator | Poles: 3; Slots: 6 |
| Bearings | SKF 6201ZZ or equivalent NBC/FAG |
| Winding & Insulation | Copper polyester-imide enameled wire (Class 180 per IS 13730 8) |
| Insulation System | Class 155 insulating materials & varnish; varnish applied via vacuum pressure impregnation; curing done in air-circulating oven; insulation resistance ≥ 20 MΩ |
| Finish & Color Coding | Powder-coated (≥ 60 μm) in silver metallic (HAWCOPLAST HVC 100 / MARPOL 95 03014) |
| Color Band | 20 mm dark yellow band around mid-body (sensorless variant) |
| Guard | Crashworthy as per ICF drawing ICF/SK-7-6-158 latest alteration |