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Motor Generator Services

Motor Generator Services in Singapore

Here are some of the repair and overhaul services we provide:

As a leader in the field of electrical and mechanical engineering, we have more than 20 years of experience with all types of electrical motors and generators. A staple across the industry, we have developed our technical expertise in repairing and overhauling electrical motors and generators.

At Maintech Engineering & Supplies Pte Ltd, we are confident of providing valuable services to our partners, to ensure key pieces of equipment are kept in the optimal condition by expert servicing.

Our workshop in Singapore, armed with the most modern equipment and tools, is the optimum place to administer these repairs and overhauls. Spare parts and installation of new aspects can all be done at our workshop. As an authorised service workshop for many international electric motor and generator manufacturers, such as Siemens and Baldor, original parts can be found here in Singapore.

Here are some of the repair and overhaul services we provide:

  • Motor Rewinding
  • Motor Generator Repair
  • Motor Generator Upgrading
  • Motor Rewinding Services
  • Generator Rewinding Repair
  • AC Motor Repair / DC Motor Repair
  • AC Motor Overhaul / DC Motor Overhaul
  • Small Electric Motor Repair
  • Electric Generator Repair
  • Electric Armature Repair
  • Electric Motor Rewinding Services

* AC motor stators and rotors up to 13.8kV, 50000HP
* AC generator stators up to 24kV, 300MVA
* High-speed generator rotors up to 300MVA, 3600rpm
* DC motors/generators, armature and field coils up to 7kV, 50MW * GE 752 / EMD Drilling motors and generators

When we conduct our services, a thorough testing and analysis will be conducted. Vibration analysis can be done to identify any potential issues.

As motors are placed in potentially hazardous environments and we will attempt to make your motors explosion proof to reduce future safety hazards.

Other Services

Our workshop and engineers can also administer numerous other services:

  • Vacuum & Pressure Impregnation (VPI) process for high voltage stators, rotors and armatures.
  • Repair or restack stator core lamination
  • Vibration analysis
  • Condition monitoring of A.C. & D.C. rotating machines on site
  • Motor current signature analysis
  • Providing Electric Motor Spare Parts
  • Explosion Proof Motor Overhauling
  • Synchronise A.C. & D.C. generators on site
  • Servicing and trouble-shooting of generator control and AVR
  • Provide installation and start-up services for plant machinery
  • Provide predictive maintenance for motors and generators
  • Dynamic balance rotors, armatures and pump impellers up to 20-ton
  • Dismantle & install A.C. & D.C. rotating machines on site
  • Align A.C. & D.C. rotating machines on site using laser alignment
  • High potential tests on motors and generators
  • Tangent-Delta tests on motors and generators
  • Partial Discharge tests on motors and generators
  • EL-CID core tests on motors and generators
  • Load tests on motors and generators

Maintech Engineering & Supplies is the Authorized Service Workshop for the following manufacturers of electric motors & generators:


More than 20 years of Experience

Professional Engineers & Skilled Workers

Dependable Service Provider

    For Business: For Business inquiry fill our enquiry form or call us at - (+65) 6862 5225


    Information about the condition of a generator can be identified through various well-proven methods like partial discharge detection, infrared thermography, and vibration monitoring and analysis.

    If properly expounded on, these signs can detect the nature, location, and even the severity of developing issues, so measures can be executed to prevent losses of valuable production time and costly equipment.

    When cleaning: Dust, oil, grit, and moisture may appear. Oil can attack insulating varnish, and an oil-soaked motor can burn out.

    When moisture is present: Humidity on iron and copper can lead to oxidation, resulting in increased heating and resistance, and eventual failure.

    When tightness occurs: High speed movements cause wear and imbalance of moving parts, leading to vibrations.

    When there’s stressing of bearings and races: Repeated stressing results in bearing failure and fatigue of the metal. The higher the load, the higher the stress, and the shorter time until the bearing fails.

    When windings are experiencing operating interruptions/failure: Causes usually include insulation deterioration, accumulation of dust and dirt, and obstruction of ventilation.

    When stator windings are malfunctioning: Traced to causes like moisture, worn bearings, overloading, failing insulation, and operating single phase.

    Cleaning: Check for dust, oil, grit, and moisture and ensure they’re not present; otherwise, thoroughly clean the motor and apply a fresh coating of insulating varnish.

    Moisture: Maintain dry conditions at all times; keep humidity to a minimum, and maintain low moisture levels like oil from building up. Use space heaters if needed.

    Tightness: During the overhaul of motors, mechanical measurements of bearing journals and bearing housings are recommended.

    Bearings failure: Periodic replacement of bearings is vital for a good maintenance program.

    Windings: Windings should be regularly inspected for obstruction of ventilation, accumulated dust and dirt, and insulation deterioration.

    Stator windings: Periodic cleaning, oven drying, and varnishing to be carried out to fill all air spaces caused by drying and shrinkage will maintain a solid winding and provide an effective seal against moisture.

    There are numerous reasons (but not limited to) that cause stator winding failure, and they include:

    • High partial discharge (PD) levels leading to rapid ageing of the stator winding insulation system.
    • Electric stress control coating resulting in issues like coating deterioration and bar abrasion.
    • Loose coils in the slot causing load cycling and sheer stressed between the coils and stator core.
    • Vibration sparking that inflicts damage on coil insulation, may result in failure in 5 years.
    • Endwinding PD may slowly erode the groundwall insulation and even result in phase-to-phase stator failure.
    • Inadequate support of coils in the endwinding area, resulting in white powder and fretting issues that’ll cause a high risk of a ground fault.

    Premature stator winding insulation issues

    Have an adequate purchase technical specification. Possible suggestions (but not limited to) include:

    • Stators rated more than 6 kV should undergo a ‘black-out’ test and partial discharge test.
    • Groundwall insulation system is required to pass a voltage endurance type test just like the ones mentioned in IEEE 1043 and IEEE 1553.

    Rotor winding failure

    Have a detailed technical specification that comprises the crucial aspects of the rotor winding design. Relying on standard specifications like API 546 is insufficient as it doesn’t include all the required details for a reliable salient pole rotor winding design.

    Furthermore, it’s also key for the manufacturer to have an adequate quality assurance problem that covers component manufacture, design verification, rotor winding assembly, and final testing of the assembled motor.