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Changsha Changli Group Co., Ltd.
Its core business is electric motor manufacturing.
Key products include standard asynchronous motors, variable-frequency speed-regulating motors, permanent magnet motors, high-efficiency energy-saving motors, wound-rotor motors, and large synchronous motors.
The products have a wide range of applications.
They are used in industries such as metallurgy, papermaking, chemicals, cement machinery, electric power, and water conservancy, and are exported to regions including Europe, Southeast Asia, the United States, and Russia.
The TDMK series consists of large three-phase AC synchronous motors designed specifically to drive low-speed, high-power machinery such as mining mills. This series encompasses two excitation types—the TDMK (brushed) and the TMW (brushless)—and is characterized by high starting torque.
This series of synchronous motors complies with standards such as GB755 ("Rotating electrical machines – Rating and performance") and JB/T1473 ("Technical specifications for large three-phase AC synchronous motors for mine transmission"). Power ratings and mounting dimensions conform to the company's internal standards, IEC standards, and German standards, making them suitable for integration into export equipment or as replacements for imported products.
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Voltage ratings: 3kV–11kV and other voltage specifications.
Motors support direct-on-line (full voltage) starting as well as reduced-voltage soft starting.
Power range: 400–15,000 kW
Number of poles: 60, 48, 40, 36, 32, 30, 24, 20
Synchronous speed: 100, 125, 150, 167, 187.5, 200, 250, 300 rpm
Frame size: 4250, 3250, 2900, 2600, 2150, 1730
Frequency: 50/60 Hz and variable frequency (VFD)
Cooling method: IC01, IC37, IC81W
Protection class: IP00, IP20, IP21, IP23, IP44, IP54, IP55
Structure and mounting type: IM7311
Standards: IEC, GB.
These motors are available in two types: "shaft-impulse" (clutch-assisted) and "non-impulse" (direct-drive). Shaft-impulse motors require the use of a pneumatic clutch.
Non-impulse motors offer superior starting performance.
At rated voltage: Starting torque × 1.7 (0.6 for shaft-impulse type),
Pull-in torque × 1.0 (0.6 for shaft-impulse type),
Pull-out torque × 2.0,
Starting current × 7.0.
Variants derived from this series—including outdoor (W), humid-tropical (TH), and outdoor humid-tropical (THW) versions—share the same performance specifications, mounting methods, and external dimensions as the basic series.
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Raw Materials
Frame: Cast iron, steel; Stator: Copper
Rotor: Copper/Aluminum;
Shaft: 45# steel;
Bearings: SKF or equivalent
Packaging and Coating
Standard seaworthy packaging suitable for export. Plywood
packaging or fumigated wooden packaging,
suitable for long-distance ocean transport.
Standard coating thickness: 120 microns (40-micron primer and 80-micron topcoat).
We employ professional coating specialists capable of mixing and applying any color of your choice.
Warranty Period
Standard warranty period: 12 months after commissioning or 18 months after delivery, whichever comes first.
Please contact us for details regarding extended warranty options.
Quality Control
In-process inspection/Quality control
All measuring equipment and instruments are calibrated annually.
Quality control measures are implemented for every project.
Each motor undergoes testing before leaving the factory and is shipped only after passing inspection. A test report is provided with every motor.
