Hai Ha M&S Electric Services

Are you searching for a reliable and affordable motor rewinding service in Vietnam? Look no further than Hai Ha M&S, located in Haiphong. With over 15 years of experience as one of Vietnam’s most esteemed electric motor suppliers, we offer bespoke electric motor rewinding services to meet your needs.

As an accredited member of The Association of Electrical and Mechanical Trades, we have extensive experience in providing electric motor rewinding services for a wide variety of motors. We offer free testing and quotations and will guide you through the rewinding process, ensuring that you understand how to get the most out of your motor.

Rewinding is often the fastest and most cost-efficient motor solution, and we are ready to help. Contact us using the form below or by calling +84 388 441 654 to learn more about how we can assist you in rewinding your motor.

What is motor rewinding?

Motor rewinding is a process that involves re-winding the coils in electric motors that have experienced a deterioration in their efficiency. The goal of this process is to improve the motor’s efficiency and prolong its lifespan, which can be a more cost-effective solution than replacing the motor altogether. Rewinding can help restore the motor’s original performance, reducing energy consumption and improving overall efficiency.

How to determine if your electric motor needs a rewind

1. Rule out obvious causes

To determine if your motor needs a rewind, it’s sensible to first rule out any obvious causes. Start by assessing the condition of your motor and make a note of any physical defects that the motor has. Obvious issues could include broken mounts, scorch marks, and contamination from water or rust. After you’ve made a preliminary inspection of the component, try rotating the shaft by hand. If you’re unable to move the fan, then an obstruction or failed bearings could be the issue, as opposed to a winding issue.

2. Testing motor windings

Once you’ve determined that the motor is not failing due to an obvious mechanical reason; measure winding resistance, check 3 phase windings by supplying low voltage and check the currents are balanced.

3. Measure insulation resistance

Insulation resistance (IR) is another measurement that you can use to determine if your motor is in need of a rewind or not. These measurements can be taken between windings, and between the windings and earth point. The IR value should preferably be greater than 100M ohms and a minimum of 2M ohms. A measurement of fewer than 2M ohms indicates that the insulation is deteriorating, or has failed already. Many winding faults can be attributed to low IR. Contamination, power surges, excessive heat, vibration or damaged wires can all contribute to creating a low IR. In some cases, a thorough clean and dry can help to fix these issues, but often an electric motor rewind is the most efficient route to resuming optimal performance.

Benefits we offer with our motor rewinding services:

  • Free local collection and delivery service for all motor rewinds
  • Free testing and quotation
  • 24-hour service if required
  • Full 12-Month Parts and Labour Guarantee
  • Electric motor rewinding service near you
  • Small electric motor repair near you

As one of the longest established suppliers of electric motors & industrial fans in the Vietnam, we are proud to offer an unbeatable rewinding service across an unrivalled range of motors.

Contact us at +84 388 441 654 via the form below to take advantage of our local collection and delivery service for all motor repairs, free testing and quotes, and a full 12-Month Parts and Labour Guarantee.

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Why does a motor need rewinding?

In addition to improving efficiency, motor rewinding prevents motor breakdowns and extends the life of motors. Motor rewinding can also revitalise a motor if it has previously burnt our. Pairing motor rewinding with replacing older or more damaged component parts can greatly improve your motor’s sustainable efficiency and overall lifespan.

How is motor rewinding done?

Most motor rewinding processes generally involve three simple steps. First, the winding coils are removed or stripped, depending on the model. Next, new winding coils are often inserted before  being insulated. Finally, the motor is rewound, and the insulation paper lining the stator is replaced if necessary. Below we’ve detailed our tried and tested motor rewinding process we’ve been refining for over 90 years, enabling us to provide our customers with unrivalled reliability and efficiency.

1. First Inspection

You can send us the motor, or if you’re local to us we’ll pick it up from you. We will then inspect your motor to determine what the issue is. We may ask you questions related to how often the motor is used, what kind of operating environment it is in, and whether you’ve had any rewinds performed before. This will help us determine the source of the issue so that we can select the right course of action.

2. Dismantling

Unless the issue is evident immediately, it is likely that we will need to dismantle the motor to examine it fully. Our experienced team has dismantled and re-assembled hundreds of motors, so your machine will be in safe hands. After this has been done we will be able to determine the source of the issue and be able to offer you a bespoke quote for the rewind or repair. We are not obliged to re-assemble items that have been dismantled for quotation purposes only.

3. Removal of Winding and Cleaning of Core

If you decide to go ahead with the motor rewind then our team will get on with the task of recording the winding detail on data sheets, before carrying out core loss testing and then removing the old winding. It’s important for the stator core to be properly cleaned at this point so that the motor is properly prepared for rewinding.

4. Rewinding the Motor

Once the motor has been properly prepped we’ll get on with the rewinding, ensuring that the original winding configuration is duplicated for optimal efficiency. In some cases, our engineers may be able to identify a different style of winding that will match the motor’s performance. Once the rewinding is completed, we’ll conduct a series of tests to ensure that all is performing as it should be, before re-assembling the motor.

5. Collection or Delivery

Once the job is completed we’ll happily arrange a free delivery (if you are local to us), or enlist a trusted courier service to deliver your motor. Alternatively, you’re more than welcome to pick up the motor from our shop yourself.

How to rewind an electric motor

1. Clean work surface

Make certain to clean your working area thoroughly, removing any dirt or debris that may have accumulated. Be particularly meticulous in removing any metal shavings, as they can be attracted to the magnetic components of your electric rewind and create problems in the future.

2. Dismantle Motor

It is important to mark all parts that can be removed. Pay attention to the position of pulleys, couplings, and other components. Examine the bearing housings and make a note of the bearing sizes, taking into consideration nuts, bolts, washers, screws, and other small parts. Keep these parts secure and in a safe place.

3. Take Note of the Motor Windings

Inspect the winding connections carefully and create a drawing if needed. Record the type of winding, including the number of slots, coils, and poles, for future reference.

4. Remove Coil from Stator

Cut one end of the winding off, taking care not to damage the stator. Use heat if necessary to soften the varnish that secures the coils in place, and carefully pull the coil out from the end.

5. Insulate Stator

Thoroughly clean the stator of all old insulation. Inspect the slots for any sharp edges and file them down if necessary. Install the appropriate thickness of insulation to re-insulate the slots.

6. Source Correct Replacement Wire

Obtain the same gauge of wire that was used in the original windings. Count the number of turns in the coils of the original winding. This will ensure that the new winding matches the original specifications.

7. Recreate Original Winding Coils

Using the same gauge wire as the original winding, wind a new set of coils to match the size and specifications of the original winding. Connect the coil lead ends according to the original winding connections. This will ensure that the new winding performs correctly.

8. Varnish Windings

After winding the new coils, perform insulation and continuity tests to ensure that the new winding is sound. Once the tests are completed and any issues have been resolved, impregnate the windings with varnish and cure them in an oven. This will provide additional insulation and protection to the windings.

9. Reassemble Motor

Replace the old bearings with new ones on the rotor. Insert the rotor back into the stator. Reinstall the endplates, making sure to align all the location indicators that were made during the motor disassembly. Test the motor to ensure it functions properly. Finally, repaint the motor to protect it from environmental factors.

Small Electric Motor Repair Near You

Our complete operations are housed in our current location in Haiphong. We maintain all of our stock at this facility, and we also provide electric motor rewinding and repairs for our valuable customers. Whether you are located near our Hai Ha M&S workshop or at a more distant location, we are pleased to offer assistance with small electric motor repairs and other services as needed.


Hai Ha M&S Services Co., Ltd. specializes in the practice of rewinding, which has been one of our core activities for many years. Our company has acquired extensive experience and professional skills in this field, which has contributed to our success. We attribute our success to the combination of modern technologies, high-quality materials, and professional expertise that ensures continuity and guaranteed quality.

Our rewinding department is equipped with the latest machinery, including computer-controlled winding benches, which enable us to provide superior services to our clients. We offer a wide range of rewinding services that include rewinding of generators, electric motors, DC machines, AC motors, rotors/pole wheel armatures, turbo rotor armatures, high-voltage machines, and transformers.

Special winding techniques

Hai Ha M&S Services Co., Ltd. manufactures form-wound coils of profiled wire in-house, which are utilized in DC machines or larger generators. Furthermore, we possess winding benches that allow us to directly wind rotors onto pole shoes. Our company is also capable of repairing iron cores. These specialized capabilities enable us to achieve very short delivery periods for our clients.







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rewinding motor,rewinding motor in viet nam

Hai Ha M&S Electric for professional electric service 

  • Professional and affordable electric service provider

  • Locally owned and operated in many places in Vietnam

  • Highly recommended for business and Vessel services

  • Call Hai Ha M&S electric services +84 388 441 654

Finding a reliable and experienced electrical service provider can be a challenging task. However, if you are in need of such services, look no further than Hai Ha M&S. Our team of expert electricians is well-equipped to handle all your electrical needs, whether it’s on board your vessel or in your commercial office area.

We take pride in providing top-quality service to all our customers, and we offer a comprehensive range of services, including repairing PLC, Fire Detection system, Auto Telephone, remodeling, troubleshooting, and more. Our team of experts is available to offer top-notch advice on any electrical problem you may be experiencing in areas like Haiphong port, Campha anchorage, Vungtau, Hochiminh, and others.

If your project requires an in-person inspection, do not hesitate to contact us immediately. Our team is ready to diagnose and service your electrical issue with the utmost professionalism and expertise. Choose Hai Ha M&S for all your electrical service needs, and experience top-quality service like never before.

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Top-notch service from Hai Ha M&S

At Hai Ha M&S, we are dedicated to providing top-notch electrical services and excellent customer service to all our clients. Our team of experts is committed to providing the best possible electrical service solutions for your project, ensuring that your needs and expectations are met to the fullest.

We offer thorough inspection services to identify any electrical issues or problems, allowing us to resolve them promptly and efficiently. Our team is equipped with the latest tools and technology, enabling us to provide innovative solutions and services to our clients.

We take pride in our extensive experience in the industry, having served our valued customers for over 10 years. Our reputation for quality work and excellent service is unparalleled, and we strive to maintain our high standards on every project we undertake.

Choose Hai Ha M&S for all your electrical service needs, and experience the best service and expertise the industry has to offer. Our team is committed to providing you with the highest level of service and satisfaction, and we look forward to working with you.

Why choose Hai Ha M&S

At Hai Ha M&S, we approach every electrical project with a commitment to professionalism and excellence. Whether it’s installation, repair, maintenance, or any other type of electrical service, we ensure that it is completed to the highest standards.

Our team of experts is well-equipped to handle all your electrical needs, and we take pride in providing innovative solutions and services to our clients. We believe that every project deserves our full attention and commitment, and we strive to exceed your expectations on every project we undertake.

Our slogan, “do everything in the best way”, reflects our commitment to quality workmanship, excellent customer service, and attention to detail. We believe that every aspect of our work should be done with the utmost care and professionalism, from start to finish.

Choose Hai Ha M&S for all your electrical service needs, and experience the best that the industry has to offer. Our team is dedicated to providing you with the highest level of service and satisfaction, and we look forward to working with you.



Marine refrigeration systems play a crucial role in ensuring the quality of cargo during transportation, making them an essential part of any vessel. To fulfill this core business function, high-quality marine refrigeration and air conditioning systems must be installed on board.

Various refrigeration and air conditioning systems are present on ships, including those for food preservation, central air conditioning, cold storage for goods and fishing boats, and container cooling. The refrigeration system’s critical components include temperature sensors, automatic control electrical systems, refrigerants, and air compressors.

The refrigeration system operates through a cold cycle consisting of five components: refrigerant (typically R22 or R44), compressors (such as Turbocor compressors, known for their durability, oil-free design, and compact size), condensers (which may be seawater cooled, fresh water cooled, or air cooled), evaporators, and expansion devices.

GMDSS annual radio survey and VDR / SVDR (APT) services in Vietnam.

Hai Ha M&S has recently expanded its service portfolio to offer mandatory GMDSS (Global Maritime Distress and Safety System) annual radio survey and VDR/SVDR (APT) services. These services are required by the IMO (International Maritime Organization) and national authorities in each country.

Customers can now benefit from GMDSS annual radio survey services including AIS (Automatic Identification System), SSAS (Ship Security Alert System), and EPIRB (Emergency Position Indicating Radio Beacon) as well as VDR/SVDR (Voyage Data Recorder) annual performance tests (APT).

Our services cover major shipping centers worldwide, including Greece, Spain, Turkey, UAE, Singapore, Korea, Thailand, China, USA, Brazil, and Chile. We offer our services to ships registered under the leading classification societies with VDR/SVDR terminal equipment from major manufacturers globally. Our expert solutions ensure compliance with mandatory regulations and provide reliable and effective services to our customers.

Hai Ha M&S is remaining consistent to its principles of competitive and reliable services provision that cover the full range of requirements of modern shipping in satellite communications and is exploiting its presence to the international market by providing certified services for GMDSS annual radio survey and VDR / SVDR (APT), in order to cover its customers’ needs worldwide.

As one of the companies operating for many years in the field of ship repair and spare parts supply. We supply electrical spare parts – electronic boards of reputable manufacturers as well as second-hand spare parts. During our many years in the ship repair, we have also cooperated with many reliable spare parts suppliers.
We supply:
-3  phase electric motor
-3 phase generator
-Relays and sensors
-Electronic boards
-Electric cable