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Accurately Measure Pump Motor Efficiency And Heat Generation

measure pump motor efficiency


Using helicopters has been found to be effective in a number of industries, including agriculture, forestry and firefighting in particular. Containing large fires, sometimes stirred by winds, is an extremely dangerous job, costing hundreds of lives of firefighters every year, not to mention the ones who get injured in the process.

As a result, when it comes to big fast-spreading fires, water bombers serve as an essential firefighting tool all around the world. Being able to deliver 10,000 litres of water in one drop on average and dump enough water to cover 6 double-width football fields, aerial firefighting is becoming an obvious choice for fast response fire-fighting services.


Although speed, mobility and capability of pump motors in the short run duration refill applications are beyond question, the water pump systems in are still complex, heavy and in many cases unreliable due to an absence of water sites nearby. The Kawak team was tasked to develop a new innovative jet pump series, able to improve the flexibility of the water bombers systems and therefore their performance.

Kawak Aviation Technologies has developed a new line of “Jet Pump” (or JP) series helicopter refill system, allowing to draw water from practically any accessible water resource, decrease refilling cycle times without a need for landing and use the motor as the driver of an air conditioning system.

“The challenge was to demonstrate that the motor could meet the worst case drive requirements at temperatures over 50C. With the Datum M425 Torque Sensor, we were able to accurately measure the motor heat generation, do this quickly and be confident in the test data”.

Unlike previous helicopter water pumps, the new Jet Pump line of products, provides helicopter operators with a high-volume, lightweight powered fill option that can produce higher water fill rates between 1150 and 2500 gallons per minute, using shallow water resources as low as 40 cm.

This new JP series solves current problems with mechanical issues, complexity and reliability of helicopter refill systems offering customers a better value and a competitive advantage to outperform competitors and win more contracts.


“ The overall design and all-digital interface of the Datum sensor are great. It avoids introducing errors or noise in analogue signals.”

In order to determine the suitability of the new pump motor in this application, Kawak needed to conduct testing to verify motor performance and its cooling. Being deeply passionate about developing the best product technology on the market and having enough internal resources, they decided to run motor performance testing in-house.

However, Kawak required a reliable product to measure shaft torque and speed on the motor and needed to make a choice between purchasing a commercial dynamometer or a highly accurate and reliable non-contact torque transducer.

After making a comparison between products available on the market and consulting with the manufacturing partner, the Kawak team decided to use the Datum Electronics M425 Torque Transducer to measure motor heat generation as accurately as possible.

“Although we weren’t confident that we would be able to measure motor heat generation accurately (typically small errors in shaft output power measurement cause large uncertainty in heat generation estimates), we have been impressed with the accuracy of the Datum Torque Sensor.”

Following Datum’s M425 Torque Transducer Installation Guide, with a little bit of help from the Datum support team, the Kawak team was able to place the M425 Torque transducer on the new JP series pump motor and tests began.

Measuring performance of the pump efficiency is enabled by accurate measurements of a power input to the pump (power in) that equal to the sum of pumping energy (water flow rate and pumping lift) and generated heat change (power out).

Although the Kawak team wasn’t sure about test accuracy at the beginning, the inline rotary M425 Sensor was able to measure motor shaft power to an accuracy that confirmed the test results including the temperature changes across the pump.


Accurate measurement of motor pump efficiency is essential for improving the pump efficiency as it can generate a big economic potential.

It was found that heat generation is within a few percent difference between power in and power. As a result, the Kawak team was able to create new uses for the motor, namely as the driver of an air conditioning system where there is potential for much larger sales.
Today, new JP series refill system a leap forward allowing Kawak to increase efficiency, sharpen reliability and improve the performance of the refill pump.

Datum Electronics Ltd

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