This safe explosion-proof motor is part of the YB3 series. Compared to the YB2 model, it cuts losses by 20%. It has lots of structural perks-runs efficiently, makes little noise, and is safer to use.
The standard mounting configuration is B3. The duty cycle is S1. Operating air temperatures range from -20°C to 40°C. Altitude should not exceed 1000 metres. Customisation services are available upon request. The following outlines key structural features of the motor.
1. Small Space
The installation space for the motor has been reduced, enabling the motor to have a smaller size, higher performance and reliability. The safe explosion-proof motor perfectly meets these requirements, with reliable performance and a compact structure.
2. Extended Service Life
It's high-quality and reliable, so it runs for a long time. The motor frame and end covers are made of high-strength cast iron, so it is mature and durable. We' ve optimized the frame with aerodynamic design to boost cooling airflow.
The compact motor frame employs parallel full-length cooling fins with a central taper. The fins aren't evenly spaced or concentrically arranged. Inside, four axial ventilation channels are built in. At the winding ends inside the frame, axial parallel cooling ribs are added to expand the heat dissipation area. The motor has great corrosion resistance and a surface coating, protecting it from long-term weathering. The dual-circuit cooling system achieves higher power density and keeps the motor's temperature consistent everywhere-this really helps prolong its operational lifespan.
3.Cooling system
The cooling principle of safe explosion-proof motor, characterised by their heat dissipation fins, also defines the motor's fundamental properties. With the continuous advancement of motor technology, the volume per unit capacity of electric motors has progressively diminished, leading to increasingly challenging heat dissipation conditions. When the motor runs and gets hot, good thermal design is what makes heat dissipation work well. Motor tech's always advancing, so motors with the same capacity are getting smaller. And that means thermal management needs to keep up.
It features two independent cooling air circuits: an internal cooling circuit and an external cooling circuit. The majority of heat generated by losses is transferred from the stator core to the frame, where it is dissipated by the external cooling airflow. Most of the leftover heat comes from rotor losses and some stator winding end losses. It's transferred to the frame through the internal cooling circuit.
For the safe explosion-proof motor, the tapered frame design helps external cooling airflow pass over the cooling fins. This airflow travels along the fins from the non-drive end to the drive end. The frame and cooling fins are configured for fast heat dissipation. The terminal box is kept away from the fins, so air flows smoothly without getting blocked. We've added internal cooling fins to the frame's inner surface around the stator winding ends-this makes heat dissipation much better.
An internal fan at the non-drive end handles internal air cooling. It moves air through the rotor ventilation holes. This airflow becomes highly turbulent outside the internal cooling fins (between the frame and end covers), so secondary cooling is complete. The frame facilitates internal and external air heat exchange. The cooled air flows back towards the drive end through four ventilation ducts within the frame, following the same direction as the external cooling air. This ensures relatively uniform heat dissipation from the motor, achieving an optimised design for both internal and external air pathways, as illustrated in Figures 1 and 2.
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