Product Overview

The TDMK series large three‑phase AC synchronous motors are core drive solutions for mining, cement, and heavy industrial applications. As Changli’s flagship product line since our founding in 1946, the series includes brushed TDMK models and brushless TMW variants. Renowned for high starting torque, these low-speed, high-power motors are widely deployed to drive lattice ball mills, rod mills, coal mills, and other heavy grinding equipment.

Backed by over 70 years of high‑voltage AC motor manufacturing experience, Changli integrates global advanced technologies and industry-specific optimization for mining operating conditions. With mature design systems, upgraded manufacturing processes, and premium material selection, this motor series delivers enhanced reliability, compact structure, lower vibration, quieter operation, lighter weight, stronger outdoor adaptability, and higher energy efficiency.

The series fully complies with GB755 and JB/T1473 industrial standards. Its power ratings and installation dimensions meet IEC and German standards, making it ideal for supporting export equipment and serving as a reliable replacement for imported motors.

The TDMK series adopts a slip-ring and brush excitation system with thyristor control. In contrast, the TMW brushless synchronous motor features a coaxial AC exciter and rotating rectifier disc. It eliminates brush replacement and slip ring wear issues, delivering superior stability in harsh working environments.

The motor series covers voltage levels from 3 kV to 11 kV and supports both full‑voltage direct starting and reduced‑voltage soft starting modes.

The motor is divided into two types: shaft punching motor and non-punching motor, shaft punching motor needs to be used with pneumatic clutch.

Shaft non-perforated motors have high starting performance.

At rated voltage: starting torque x 1.7 times (0.6 for shaft perforation)

Draw-in torque x 1.0 times (0.6 for shaft perforation)

Lost step torque x 2.0 times

Starting current x 7.0 times

The performance indexes, mounting and external dimensions of the outdoor (W), humid tropic zone (TH) and outdoor humid tropic zone (THW) motors derived from the series are the same as those of the basic series.

Advantageous Features

1. Advanced Optimization Design Means

Combined with our long-term successful technology of producing medium-sized high-voltage motors, we adopt advanced design means to optimize the design of TDMK series three-phase synchronous motors.

Magnetic Field Analysis	Performance Analysis

Shaft system calculation

2. Reliable Motor Manufacturing Technology

2.1 The motor base is made of Q235B high-quality steel plate welded. The design of motor parts are analyzed by finite element modeling and verified by test, with good rigidity, light weight and stable structure.

Low vibration, high precision machining of rotating parts to ensure concentricity of stator and rotor.

Low noise, seat stress relief technology ensures the stability and dynamic performance of the seat.

2.2 The stator core is made of 0.5mm thick low-loss silicon steel laminated with radial ventilation channels separating the core sections.

2.3 The stator winding is insulated with mica tape. After the winding is installed, vacuum pressure immersion paint (VPI) is applied to the whole stator, and the winding insulation grade is F, which has a good temperature rise margin. The coil slot fixing method and connection method of LDW advanced technology are introduced to ensure the long-term operation reliability of the motor.

2.4 The coil temperature measuring element, bearing temperature measuring element, vibration measuring probe, cooler water leakage detection device, etc. collect operating information at any time and deliver it to the control system exclusively to ensure that the motor is effectively monitored by the system.

2.5 The magnetic pole core is made of 1.5mm thick steel plate laminated. The magnetic pole wire gauge, damping strip and damping ring are made of high quality copper, and the magnetic pole coil is insulated with class F. The magnet pole coil connection and damping ring connection are hard brazed.

2.6 The motor uses domestic and foreign high-quality bearings, long bearing life, simple maintenance bearing stability is good, simple and convenient daily maintenance.

2.7 Higher mechanical performance, high temperature rise design margin, the same motor can meet the requirements of a variety of working conditions. Installed with anti-condensation shutdown space heater to facilitate daily maintenance.

2.8 AC exciter and rotating rectifier adopt independent structure, easy to maintain and repair. The rotating rectifier disc is small and compact, with electrical connections, structural fixings and electrical heat dissipation parts integrated, and each flap is insulated from each other, which makes operation reliable, low failure rate and easy to install and maintain. Brushless excitation system is adopted, and the excitation device has automatic excitation throwing technology, automatic excision technology of demagnetization resistor, and lost-step re-step technology to ensure normal and reliable operation. The supporting excitation cabinet adopts fully digital circuit, with high reliability, strong anti-interference, low failure rate of main circuit control components and air-cooling system components, ensuring long-term operation. In the case of no shutdown and guaranteed load operation, the plug-in can be directly replaced and no more debugging can be done after the replacement. Custody, disassembly, maintenance is convenient.