Main Menu

See All Software See All Instruments See All Transducers See All Vibration Testing Equipment See All Electroacoustics See All Acoustic End-of-Line Test Systems See All Academy See All Resource Center See All Applications See All Industries See All Services See All Support See All Our Business See All Our History See All Global Presence

Main Menu

See All nCode - Durability and Fatigue Analysis See All ReliaSoft - Reliability Analysis and Management See All Test Data Management See All DAQ Software See All Drivers & API See All Utility See All Vibration Control See All High Precision and Calibration Systems See All DAQ Systems See All S&V Hand-held Devices See All Industrial Electronics See All Power Analyzer See All S&V Signal Conditioner See All Acoustic See All Current and Voltage Sensors See All Displacement See All Force sensors See All Load Cells See All Pressure See All Strain Gauges See All Temperature Sensors See All Torque Sensors See All Vibration See All Accessories for Vibration Testing Equipment See All Vibration Controllers See All Measurement Exciters See All Modal Exciters See All Power Amplifiers See All LDS Shaker Systems See All Test Solutions See All Actuators See All Combustion Engines See All Durability See All eDrive See All Production Testing Sensors See All Transmission & Gearboxes See All Turbo Charger See All Training Courses See All Acoustics See All Asset & Process Monitoring See All Custom Sensors See All Data Acquisition & Analysis See All Durability & Fatigue See All Electric Power Testing See All NVH See All Reliability See All Smart Sensors See All Vibration See All Weighing See All Automotive & Ground Transportation See All Calibration See All Installation, Maintenance & Repair See All Support Brüel & Kjær See All Release Notes See All Compliance See All BKSV Worldwide Contacts

Main Menu

See All API See All Microphone Cartridges See All Microphone Sets See All Microphone Pre-amplifiers See All Sound Sources See All Acoustic Calibrators See All Special Microphones See All Accessories for acoustic transducers See All Experimental testing See All Transducer Manufacturing (OEM) See All Piezoelectric Charge Accelerometers See All Piezoelectric CCLD (IEPE) accelerometers See All Electroacoustics See All Noise Source Identification See All Environmental Noise See All Sound Power and Sound Pressure See All Noise Certification See All Industrial Process Control See All Structural Health Monitoring See All Electrical Devices Testing See All Electrical Systems Testing See All Grid Testing See All High-Voltage Testing See All Vibration Testing with Electrodynamic Shakers See All Structural Dynamics See All Machine Analysis and Diagnostics See All Dynamic Weighing See All Vehicle Electrification See All Calibration Services for Transducers See All Calibration Services for Handheld Instruments See All Calibration Services for Instruments & DAQ See All On-Site Calibration See All Resources See All Software License Management

On test: Generators for wind turbines from The Switch

the switch, Finland


The Finland-based company The Switch is a world leader in directly driven permanent magnet generators (PMG) for wind turbines with a power output of 1 MW up to 5 MW at medium to high rotational speeds. To determine the efficiency of the generators, a torque flange from HBM is installed into the shaft train as additional measuring system.


Determination of efficiency

The technical challenge is to control high torque and, at the same time, achieve high efficiency. To determine the efficiency, two identical generators are installed such that their shafts can be directly connected for testing. The generator under test is driven by the second generator which, in this case, functions as an engine. Current and voltage measurements on both generators enable a relationship between the power output and the power consumption to be established and thus to determine the efficiency.

Torque flange in the shaft

The Switch installs a torque flange into the shaft train as an additional measuring system. A resulting benefit is the verification of the efficiency determined through measurement of the electrical parameters. Moreover, effects resulting from modifications to the engine or generator or from simulation of different loading scenarios can be determined fast and precisely. However, the main parameter for determining the efficiency is the transmitted power. Through direct measurement of torque and rotational speed of in the shaft train transmitted power, measurement uncertainty is small.

Combined with special converters and monitoring and control systems the solutions offered by the company can be integrated into the drive train of wind turbines as complete packages. The PMGs offered by The Switch feature a special, patented arrangement of the permanent magnets. This arrangement enables both high efficiency and a smooth running of the turbine. Use of a direct drive eliminates the need for a transmission gearing and results in reduced mechanical stress on the system as well as increased reliability and a longer service life.

About The Switch

The Switch was founded in 2006 with a challenger mindset. We wanted to break the status quo in the wind industry by pushing the permanent magnet (PM) generator and full-power converter drive train as the technology of choice.

Nearly 15 years later, there has been a shift in wind power technology with the 10 largest offshore and onshore turbine manufacturers all using permanent magnets as the technology of choice to reach higher powers and better efficiencies.

Then we went on to make a larger shift in the marine industry. In 2022 we became the leading PM shaft generator supplier for marine vessels with over 100 PM shaft generators delivered. Now, we are bringing PM motors to electric propulsion systems and revolutionary high-power converters designed for marine DC distribution without compromise.

More about The Switch

Technology used