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World’s First! JASUNG 10kV/900kW High-Voltage Flameproof Permanent Magnet Motorized Pulley Passes National Safety Technical Assessment
Recently, the China Mining Product Safety Approval and Certification Center (MA Center) organized industry experts in Beijing to conduct a new product safety technical assessment for the 10kV Rated Voltage, 900kW Rated Power Mining High-Voltage Flameproof Three-Phase Permanent Magnet Synchronous Motorized Pulley developed by JASUNG.
The expert panel listened to reports on the R&D and safety design, reviewed the assessment documentation, and after a rigorous Q&A session and discussion, reached a unanimous conclusion: Designed for long-distance, high-capacity belt conveyors in underground coal mines, the product features targeted flameproof safety designs and test verification, and basically meets the preliminary conditions for trial use underground. This marks a milestone breakthrough for JASUNG in the field of high-voltage, high-power permanent magnet direct drive, successfully securing the world’s first "entry ticket" in this domain.
01 The High-Voltage Trend: Reshaping the Core of Mining Conveyance
As modern mines evolve toward deeper excavation and larger scales, long-distance, high-tonnage belt conveyor systems impose increasingly stringent demands on drive terminals. Traditional drive systems suffer from long transmission chains and numerous maintenance points, facing immense reliability challenges under high loads and extreme environments.
JASUNG’s newly assessed product elevates the voltage level to 10kV and the power to 900kW. This is not merely an increase in numerical values, but a profound reshaping of mining conveyance scenarios:
Ultimate Energy Efficiency: High-voltage drives effectively reduce line losses and improve overall system efficiency.
Architectural Simplification: Permanent magnet direct drive eliminates redundant components like gearboxes, significantly lowering maintenance costs.
Heavy-Duty Start/Stop: Leveraging powerful low-frequency, high-torque characteristics, it easily handles heavy-load startup conditions.
02 "Dynamic Balance" Between Explosion Protection and Performance
Under the dual constraints of 10kV high voltage and mining flameproof requirements, the R&D difficulty did not increase linearly but required systematic reconstruction. JASUNG overcame multiple industry challenges through a series of cutting-edge design schemes:
1. Structural Mechanics: Hardcore Defense & Intrinsic Safety
The flameproof enclosure abandons the crude approach of simply increasing thickness. Instead, it relies on Finite Element Analysis (FEA) for refined structural optimization. The drum body and end caps utilize high-precision spigot sealing structures. With core material yield strength exceeding 355MPa and key pressure-bearing walls over 50mm thick, scientific structural redundancy reinforces the shell's load-bearing and anti-explosion capabilities. This ensures structural stability and reliability under complex extreme conditions, establishing an intrinsic safety barrier at the mechanical design level.
2. Electromagnetic Synergy: Shaft Current Suppression & Insulation Optimization
To address the common industry challenge of shaft current eroding bearings under high-voltage conditions, the product employs specialized insulation isolation and shielding structures, paired with high-temperature and high-voltage resistant insulation substrates. This reliably severs the shaft current conduction path, providing long-term protection for bearings and transmission components. Simultaneously, it adapts to 17-level and above multi-level inverter drive schemes, effectively suppressing common-mode voltage, mitigating high-frequency pulse interference, and establishing a comprehensive high-voltage electromagnetic protection and insulation system.
3. Smart Operation: From "Reactive Maintenance" to "Active Perception"
The system integrates full-dimensional condition monitoring sensors, supporting fault trend identification and remote diagnosis. The safety logic evolves from simple "shutdown protection" to "intelligent self-healing," perfectly aligning with the core demands of future smart mines for intelligent and unmanned equipment.
In the mining industry, the MA Safety Certificate is the highest benchmark for measuring product safety and reliability. Passing this assessment not only validates JASUNG's R&D strength in high-power permanent magnet direct drive equipment but also highlights its comprehensive leading position in manufacturing processes, quality control, and testing/verification systems.
Looking ahead, JASUNG will continue to focus on scenarios requiring continuous operation, high energy consumption, and high reliability—such as mining, metallurgy, ports, coal, building materials, and papermaking. We will drive the evolution of permanent magnet direct drive technology from single-unit energy saving to system-wide efficiency enhancement, providing more reliable drive solutions for the green, intelligent, and low-carbon upgrading of industrial equipment.
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Address: No. 108, Changtang Road, Wujin District, Changzhou, Jiangsu, China