Product Overview
The YB Series high-efficiency high-voltage flameproof three-phase asynchronous motors are newly upgraded energy-saving models independently developed by our company.
This motor series is widely deployed in hazardous locations with flammable and explosive mixtures across petroleum, chemical, metallurgical and steel industries. It is adopted to drive various mechanical equipment including ventilators, compressors, water pumps, crushers, belt conveyors, large fans, coal mills, rolling mills and winches.
For customized orders, we will supply a complete technical proposal and sign a formal technical agreement prior to production. The agreed technical parameters serve as the design standard for custom motor manufacturing, guaranteeing stable, safe and reliable long-term operation.
Technical Parameters
| Item | Specification |
|---|
| Power Range | 315 ~ 5000 kW |
| Frame Size | H500 ~ H900 |
| Explosion-Proof Mark | ExdⅡBT4 Gb |
| Rated Voltage | 6 kV, 10 kV |
| Rated Frequency | 50 Hz |
| Number of Poles | 2 ~ 12 poles |
| Cooling Type | IC511, IC516 |
| Mounting Form | IM B3 |
| Ingress Protection Grade | IP54, IP55 |
| Ambient Temperature | -15°C ~ 40°C |
| Operating Altitude | ≤ 1000 m |
Advantageous Features
- Optimized Advanced Design
Drawing on our decades of mature experience manufacturing medium high-voltage motors, we apply state-of-the-art design technology to fully optimize the YB3 series high-voltage high-efficiency flameproof three-phase asynchronous motors.
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Electromagnetic analysis diagram using the "field and circuit" combination method
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Shaft system analysis diagram
Advantageous Features
2. High-Efficiency Dual-Circuit Cooling System
The motor adopts independent internal and external cooling air loops, delivering maximum cooling performance while cutting energy losses to a minimum. Heat produced by the stator is primarily conducted from the stator core to the frame and carried away by external cooling air. Heat emitted by the rotor and stator winding terminals is transferred to the frame via the internal cooling circuit.
For the external cooling loop, cooling air flows across frame cooling ribs from the non-drive end to the drive end. The aerodynamically optimized rib structure maximizes heat exchange efficiency. The terminal box is mounted away from the cooling ribs to avoid blocking airflow. Inner cooling ribs surrounding the stator winding ends inside the frame further enhance heat dissipation.
In the internal cooling loop, an internal fan circulates air through rotor ventilation ducts, continuously transferring internal heat to the frame and end shields. The frame acts as a heat exchanger between inner and outer air streams. Four built-in ventilation pipes channel cooled air to circulate in the same direction as external airflow for staged cooling, creating even heat distribution across the whole motor.
This dual-circuit cooling design boosts the motor’s power density and maintains consistent temperature throughout all components.
![YB Series High-Efficiency High-Voltage Explosion-Proof Three-Phase Asynchronous Motor]()
Motor external and internal cooling air path
![YB Series High-Efficiency High-Voltage Explosion-Proof Three-Phase Asynchronous Motor]()
Internal cooling system simulation
3. Proven VPI vacuum pressure impregnation technology
The insulation system used in our high-voltage motors is proven for many years, combined with the introduced technology, the new technology of modern process, and gradually increase the proportion of mica, this insulation system is still developing and improving. The stator winding adopts 155(F) grade insulation, with reliable fixing and tying at the coil end, and it has been tested by several inter-turn pulse voltage tests and voltage resistance tests to ground during the manufacturing process, and treated by VP worker vacuum pressure impregnation solvent-free process, which has high electrical strength, mechanical strength and good corrosion resistance and moisture resistance. The coil core is treated with special anti-corona treatment, so that the motor can operate safely in areas with high altitude.
4. Reliable bearing structure
The motor is equipped with non-stop oiling and draining devices at both ends for regular grease replenishment, stator and bearing temperature measuring and anti-condensation heating devices inside the motor, and bearing temperature measuring instruments or stator temperature measuring instruments can be installed to monitor the bearing or stator temperature on site according to users' needs.
5. Reliable squirrel cage rotor structure
The motor usually adopts cast-aluminum rotor. Using centrifugal casting process or die-casting process, liquid pure aluminum is poured into the rotor core groove and cast into shape at one time, and the rotor guide bar and end ring are cast into a whole. The cast aluminum rotor structure and process ensure the incomparable reliability of the motor rotor, while making the motor have satisfactory torque characteristics. Large-capacity motors use copper bar rotors; reliable guide bar fastening and end ring welding processes, as well as the ring guard structure of high-speed motors, ensure the reliable operation of copper bar rotors.
