A stator frame is an important structural component that supports the stator core and stator winding, as well as accessories such as air coolers. It serves as a casting to protect the generator from external influences and to provide cooling air circulation.

Hydropower equipment provider

The client is a leading hydropower equipment provider. They specialize in producing a variety of hydropower equipment, including hydrotubine generators, water treatment equipment, and more.

The requirement of measuring a stator frame

The stator frame in this case is a complex and massive welded part that demands accurate control of every production process to guarantee the quality, reliability and stability.

The outer diameter of the stator frames varies depending on the size of the unit. The large unit in this case is 4 m high with a diameter of 25 m. Its arch length is around 15 meters. The customer needed to:

  • Assess the surface flatness, roughness, and weld quality of the stator frame to ensure that it meets the surface quality standards and has no significant defects or distortion.
  • Evaluate the stator frame’s concentricity and cylindricity to verify its compliance with the
  • Identify the geometric dimensions such as radius, aperture of the stator frame to validate the conformity between the actual dimensions of the stator frame and the design specifications.

Drawbacks of traditional measurement methods

  • Using CNC machine too to aid in inspection of the stator frame, such as flatness and radius, may take up to two or three days. During this period, the machine tool is occupied by the inspection process and cannot perform any other machining tasks, which waste valuable operating time.
  • The large size of hydro-turbine components poses a challenge for manual measurement, which typically requires the collaboration of two or three personnel and results in significant errors.
  • Conventional measurement tools can only measure points, lines, etc., which are insufficient to fully capture features such as curved surfaces, welds, weld beading, or other occluded or deformed areas. Traditional measurement methods also lack the ability to generate intuitive and effective inspection reports.

Scantech’s optical 3D measurement system solution

The customer was looking for efficient and intelligent ways to inspect their large welded stator frame. After searching for various solutions, they chose Scantech’s comprehensive 3D inspection solution featured by intelligent optical 3D measurement system TrackScan-Sharp and powerful software TrackView.

Workflows of 3D measurement with TrackScan-Sharp

First, the engineer used a handheld calibration rod and aligned the QR code with the tracker’s sensor to calibrate the system to ensure optimal performance. Then, the engineer placed a few markers on its surface, which helped to move i-Track during the scanning process.

The engineer used Scantech’s 3D scanner TrackScan-Sharp to obtain the 3D data of the stator frame. The customer obatined the high-precision 3D data of the stator frame and inspected deformation in around 3 hours.

The welds, chamfers, or deep recesses of welded parts posed some structural or geometrical limitations. TrackScan-Sharp easily overcame these challenges because of its high portability and flexibility. It collected data of complex structures and hard-to-reach areas with ease.

After 3D scanning, the 3D data was imported into Scantech’s in-house developed software TrackView and compared with the CAD model. The professional software allowed them to process and analyze the data and generated a detailed inspection report, which showed the full-filed data of the part. In this way. they measured, analyzed, and evaluated the dimensions and geometries such as radius, aperture, concentricity and cylindricity.

The 3D inspection of the stator frame was done on-site in the workshop. TrackScan Sharp was not affected by any vibration, high temperature, or other harsh conditions. It maintained high precision and high stability throughout the measurement process and successfully completed the project.


Large-volume measurement

TrackScan-Sharp features a large measurement volume of up to 49 m3 and strong edge measurement algorithm, which ensures that it can measure large-scale parts without moving frequently.

Efficient measurement

Due to its optical tracking technology and measurement rate of up to 2.6 million measurements/s, TrackScan-Sharp can precisely measure parts efficiently.

Precise measurement results

With its advanced hardware and software, TrackScan-Sharp can measure with high precision of up to 0.025 mm. The system helps to eliminate manual measurement errors caused by the large size of the part, and ensure accurate measurement.

Intuitive reports

With full-field data and intuitive color map, engineers can analyze the deformation of a specific surface or component efficiently, which was challenging for point or linear measurements. This enabled them to enhance their process and quality control.

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