Pump Inverter Frequency Control for Variable-Speed Synchronous Motors
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Solution Overview
Problem
In water supply and blower systems, the use of induction motors results in fixed rotation speeds tied to power source frequencies, leading to energy losses and operational burdens as operators manually adjust valves or dampers to achieve desired flow rates or air volumes, and replacing these motors with synchronous motors requires complex frequency adjustments.
Innovation Solution
Implementing an inverter-integrated synchronous motor system that automatically sets operation frequencies based on acquired model identification information and pressure/suction data, reducing operator effort and enabling energy-efficient speed control without the need for manual adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If an induction motor is used to drive the pump or fan, then the motor can be operated at fixed frequencies (50 Hz or 60 Hz) directly connected to AC power source, but the pump rotation speed becomes fixed and water or air flows more than necessary, causing energy loss
Solution Approach 1:
The patent applies dynamics by replacing the fixed-speed induction motor with a synchronous motor that can operate at variable speeds. The synchronous motor enables continuous adjustment of rotation speed to match actual demand, transforming the static operation mode into a dynamic one that adapts to varying flow requirements and eliminates energy waste from excessive flow.
Solution Approach 2:
The patent implements parameter changes by modifying the operating frequency and rotation speed parameters of the motor. By using a synchronous motor with inverter control, the system can change the rotation speed parameter continuously, allowing the pump or fan to operate at optimal speeds for different flow requirements, thereby reducing energy loss while maintaining operational flexibility.
2Loss of energy
If an inverter device is used to control motor rotation speed, then the pump can be operated at any rotation speed to adjust flow rate, but it requires manual adjustment while checking flowmeter or pressure gauge, creating operator burden
Solution Approach 1:
The patent implements feedback by incorporating flowmeters or pressure gauges that provide real-time data to the control system. This feedback mechanism allows the system to automatically monitor the actual flow or pressure conditions and adjust the motor speed accordingly, eliminating the need for manual adjustment and observation by operators while maintaining energy efficiency.
Solution Approach 2:
The patent applies self-service by enabling the system to automatically determine and adjust its own operation frequency based on installed model information and real-time flow or pressure conditions. The synchronous motor system with integrated control performs self-regulation without requiring operator intervention, reducing operational burden while maintaining optimal energy efficiency.
3Adaptability or versatility
If a synchronous motor is used instead of induction motor, then variable speed control is achieved, but setting the rotation speed to appropriate operation point becomes a burden on operator
Solution Approach 1:
The patent implements preliminary action by pre-storing operation frequency information for different synchronous motor models and their corresponding optimal operating points. When the system is installed, it automatically retrieves the appropriate frequency settings based on the installed model information, eliminating the need for operators to manually determine complex speed settings and simplifying the operation while maintaining adaptability.
Solution Approach 2:
The patent applies self-service by enabling the synchronous motor system to automatically determine its own optimal operation frequency based on its installed model information and real-time operating conditions. The system performs selfconfiguration and self-adjustment without requiring operator expertise or manual intervention, reducing operational complexity while preserving full speed control flexibility.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution reduces operator burden and energy consumption by automatically setting operation frequencies, allowing for precise control of fluid machine performance across different frequency regions, thereby improving energy efficiency and simplifying the replacement process.
Implementation Method 1
a synchronous motor operates the fluid machine at a variable speed, so that the pump or the blower can be operated at any rotation speed
Implementation Method 2
an operation frequency for operating at the same operation point as before replacement is automatically set after replacement from the induction motor to the inverter-integrated motor
Data Source
AI summary
There are provided an acquirer that acquires a discharge flow rate of a target pump in addition to model identification information of the target pump, or acquires a set of discharge pressure, suction pressure, and a cage height in addition to the model identification information of the target pump, and a determiner that, in a case where the discharge flow rate of the target pump is acquired, specifies a total lift corresponding to the discharge flow rate with reference to characteristic data corresponding to the model identification information of the target pump, and determines an operation frequency of an inverter by performing collation with characteristic data of the total lift and the discharge flow rate for each operation frequency in a case where a synchronous motor operates the pump, such that the discharge flow rate and the lift are obtained.