Introduction
When industrial facilities specify motor drive systems, the motor and the variable frequency drive (VFD) are typically sourced as separate components — a motor from one supplier, a VFD from another, connected by shielded cables with external reactors and filters. This distributed approach creates several procurement and engineering pain points: longer cable runs between VFD and motor can cause voltage spikes that degrade motor insulation; shielded cable requirements increase material costs; and split-vendor responsibility complicates warranty and troubleshooting when issues arise.
The integrated VFD motor addresses these problems by combining the permanent magnet synchronous motor (PMSM) and the frequency converter into a single unit. Ouruian, a National High-Tech Enterprise based in Shandong, China, manufactures the TYJVFT series integrated VFD with power ratings from 90kW to 1000kW. This article examines what procurement teams and technical buyers should evaluate when sourcing integrated VFD systems, focusing on total cost of ownership, installation simplification, and supplier capability.
What Is an Integrated VFD Motor?
An integrated VFD motor is a drive system where the frequency converter is built into or directly attached to the permanent magnet synchronous motor, eliminating the need for a separate VFD cabinet and the cabling between them. The motor and drive share a common enclosure or mounting frame, and the power conversion happens at the motor rather than at a distant electrical room.
Ouruian's TYJVFT series integrates the PMSM and frequency converter into one unit, with rated powers from 90kW to 1000kW, rated speeds of 90 r/min, and frame sizes from 560L to 1000L. The series covers 40-pole and 60-pole configurations, with rated torque ranging from 955 Nm to 10611 Nm depending on the model.
Key Features and Advantages
Eliminated VFD-to-Motor Cable Distance: In a traditional setup, the distance between the VFD cabinet and the motor can be significant — particularly in large industrial facilities. Long cable runs cause voltage reflections and spikes that stress motor winding insulation, potentially shortening motor life. The integrated VFD eliminates this distance entirely, removing the root cause of voltage-spike-related insulation degradation.
No Shielded Cable Required: Traditional VFD installations require shielded motor cables to limit electromagnetic interference (EMI) along the cable path. The integrated VFD's power supply does not require shielded cables, and there is no need to account for radiation interference along the cable route. This reduces cable material costs and simplifies installation planning.
Reduced Footprint and Construction Scope: By eliminating the separate VFD cabinet, output-side reactors, filters, and the associated cable laying, the integrated VFD requires less floor space and shorter construction time. For projects in constrained spaces — such as underground mining installations or retrofit projects in existing facilities — the space savings can be a deciding factor.
High System Integration: The TYJVFT series uses advanced circuit topology design for higher power density. The integration of the control system and PMSM into one unit simplifies drive configuration design and makes drive layout more flexible. The built-in PLC logic, regenerative braking, and support for Modbus and CANopen protocols provide control capabilities comparable to standalone VFD systems.
Strong Overload and Starting Torque: The integrated VFD inherits the PMSM's characteristics of high starting torque and strong overload capacity. This is relevant for applications with high breakaway torque requirements, such as conveyor systems under load or mill drives starting from rest.
Explosion-Proof Certification: Ouruian holds 200+ explosion-proof/safety standard certificates. For mining and hazardous-environment applications, this certification coverage indicates the integrated VFD can be specified for use in environments containing explosive gases or dust.
Main Applications
Belt Conveyor Systems: Mining, port, and material handling operations rely on belt conveyors that require controlled starting, speed regulation, and multi-motor synchronization. The integrated VFD's built-in PLC logic and master-slave control capability support multi-motor power balance on long conveyor lines.
Mill and Crusher Drives: Cement mills, ball mills, and crushers in the building materials and mineral processing industries require high starting torque and continuous heavy-duty operation. The TYJVFT series covers power ratings up to 1000kW for these demanding applications.
Fan and Pump Systems: Large ventilation fans, boiler feed pumps, and circulating water pumps in power plants and industrial facilities benefit from variable-speed control for energy optimization. The integrated VFD enables direct low-speed drive without intermediate transmission components.
Underground Mining Equipment: The compact footprint and explosion-proof certification make the integrated VFD suitable for underground coal mine applications where space is limited and safety certification is mandatory.
Retrofit and Upgrade Projects: Facilities replacing aging induction motor systems with PMSM technology can benefit from the integrated VFD's simplified installation — the motor and drive are replaced as one unit without installing a separate VFD cabinet.
How to Evaluate an Integrated VFD Supplier
Power Range Coverage: Verify that the supplier's integrated VFD range covers your required power ratings. The TYJVFT series covers 90kW to 1000kW in 14 models with frame sizes from 560L to 1000L. Buyers should confirm that the specific model matching their load requirements is available and request the full selection table for specification matching.
Space and Installation Constraints: Evaluate the physical dimensions of the integrated unit against your installation environment. The TYJVFT series dimensions range from 840mm to 1410mm in height, with reference weights from 504 kg to 1496 kg depending on frame size. Confirm that your site can accommodate the unit's dimensions and weight.
Cable and Wiring Simplification: One of the primary cost benefits of integrated VFD is eliminating shielded motor cables and long cable runs. Quantify the cable material savings, cable laying labor reduction, and eliminated reactor/filter costs when comparing integrated versus separate VFD+motor procurement.
Control Protocol Compatibility: Confirm that the integrated VFD supports the communication protocols used in your facility's control system. The TYJVFT series supports Modbus and CANopen, which are commonly used in industrial automation. If your system uses Profibus, Ethernet/IP, or other protocols, verify compatibility with the supplier.
Maintenance Accessibility: With an integrated unit, maintenance access to both the motor and drive is from a single location. Evaluate the supplier's recommended maintenance intervals, spare parts availability, and the accessibility of critical components for inspection and replacement. Ouruian's 40,000-square-meter facility and 300+ inspection and testing equipments indicate manufacturing and support infrastructure.
Total Cost of Ownership: Compare the integrated VFD against a separate motor+VFD solution across purchase price, installation cost (cable, reactor, filter, cabinet, labor), operating energy savings, and maintenance cost. The integrated approach typically reduces installation costs but may have a higher unit purchase price. The energy savings from PMSM efficiency — up to 30% compared to conventional induction motors as reported by Ouruian — should be factored into the long-term TCO calculation.
Why Work with Ouruian
Ouruian, established in 2013, is a National High-Tech Enterprise and a "Little Giant" specialist SME recognized by China's Ministry of Industry and Information Technology. The company operates a 40,000-square-meter manufacturing facility with 300+ inspection and testing equipments and has completed 27 research projects.
For integrated VFD procurement, several factors are relevant. The company's 200+ explosion-proof certificates indicate the TYJVFT series can be specified for hazardous environments — a requirement in mining and chemical applications. The product range covers 90kW to 1000kW across 14 models, providing specification matching for a wide range of industrial drive applications. Ouruian also manufactures the complementary components — permanent magnet motors, frequency converters, programmable control boxes, motor water cooling radiators, and high-speed motors — allowing buyers to source the complete drive system from one supplier.
The company's MIIT-certified energy-saving product designation provides third-party validation of efficiency claims. Technical communication is supported by an engineering team that can assist with load analysis, model selection, and custom configuration for specific application requirements.
Conclusion
Integrated VFD motors simplify industrial drive system procurement by combining the motor and frequency converter into one unit — eliminating long cable runs, shielded cable requirements, separate VFD cabinets, and split-vendor responsibility. For procurement teams sourcing drive systems for conveyor, mill, fan, pump, or mining applications, the Ouruian TYJVFT series offers 90kW to 1000kW power coverage, 200+ explosion-proof certifications, Modbus/CANopen protocol support, and the backing of a National High-Tech Enterprise with 27 completed R&D projects. To request the full selection table, discuss specification matching, or explore custom configurations, contact Ouruian through their website.
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