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Electric Motor ManufactureDesign and Development

Manufacturer’s fight with vibration to keep electric motor production line running.
A large-capacity inverter type power supply with a low-ripple current and low noise solves problems.

The Solution

Key Aspects of the Solution

  • The team switched to a low-distortion sinusoidal power supply to drive the motor. This eliminated any torque ripple attributable to the inverter.

  • The power supply replaced the existing inverter as an ideal voltage source.

  • It was determined that the motor was not the cause of the vibration, and the production line kept operating.

Despite being high-power, inverter-based supplies, the models in Kikusui’s PCR-WE and -WE2 series produce little ripple current or noise.

The divisional head ultimately found the answer to the problem at an expo in which Kikusui Electronics was in:
“My team staff contacted me and told me that he had found a solution that would work. I headed straight to the expo to learn more.”

The employee focused on PCR-WE/WE2 series of Ultra-compact AC/DC programmable power supply.

“For a start, I was surprised by extremely low ripple noise in the output. Most supplies tend to exhibit increased ripple and noise as their output power increases, but the PCR-WE/WE2 series, despite being inverter-based, produces very little ripple or noise. The Kikusui sales suggested that I solve the problem by replacing the inverter used to test the motor with one from the PCR-WE/WE2 series,” says the divisional head.

With ripple current from the inverter no longer an issue, it was now possible to measure the torque ripple attributable to motor itself.

The company presently replaced the inverter to PCR-WE/WE2 series as an alternative one, and once again attempted to identify the source of the vibration.

“We were able to supply the motor with a low-distortion, sinusoidal current. Now that the inverter was no longer generating a torque ripple, we were able to assess the motor discretely,” reflects the divisional head.


Testing concluded that the motors were not the source of the noise. The company submitted the results of these tests to its customer, and a shutdown of the production line was avoided.

“We were relieved to find out that we did not need to shut down the production line. Inverters are known for being compact and energy-efficient: the PCR-WE/WE2 series offers many other advantages as well, including durability, with a capability of 100% power regeneration and no reverse load flow time limit* This series has applications not only in motor testing, but also has in the areas of evaluation and research. Consequently, we believe that these power supplies will be an asset for our company,” explains the divisional head.

*Regeneration is limited within installation site and is only supported by three-phase 200V input models whose model numbers end in “R”.

Find out what a Kikusui Ultra-Compact AC/DC Power Supply PCR-WE/WE2 Series can do for your company