Water supply system and water supply method

The water supply system addresses noise discomfort by controlling multiple inverters with varying carrier frequencies based on operating states and noise/vibration thresholds, ensuring reduced noise levels in both single and parallel operations.

JP7863986B2Active Publication Date: 2026-05-22EBARA CORP
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
EBARA CORP
Filing Date
2022-02-28
Publication Date
2026-05-22

AI Technical Summary

Technical Problem

Existing water supply systems with multiple inverters experience noise discomfort due to overlapping carrier frequencies, which are not adequately addressed by existing noise reduction techniques, especially in varying operating states like single and parallel operations.

Method used

A water supply system with multiple motors and inverters that are PWM controlled, where the first inverter starts at a higher carrier frequency than subsequent inverters, and carrier frequencies are set to avoid overlap, using sensors to adjust frequencies based on operating states and noise/vibration thresholds.

Benefits of technology

Reduces noise discomfort by ensuring that carrier frequencies do not overlap, making them inaudible or less disruptive, even in changing operating conditions, thus minimizing noise intensity.

✦ Generated by Eureka AI based on patent content.

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Patent Text Reader

Abstract

To provide a water supply system and a water supply method, enabling reduction of the possibility of making people uncomfortable due to noise.SOLUTION: A water supply system 1 comprises a plurality of motors 3 which drives a pump 2 and a plurality of inverters 20 which are PWM-controlled and supply a corresponding motors 3 with current. A first machine, which is the first inverter 20 to start up out of the plurality of inverters 20, is driven at a first carrier frequency. A later inverter, which is the inverter 20 starting up after the first inverter, is driven at a second carrier frequency lower than the first carrier frequency.SELECTED DRAWING: Figure 1
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