Vacuum Pump Motor Flux Control for Noise and Heat Reduction
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Solution Overview
Problem
Vacuum systems operate at less than 100% efficiency, resulting in higher electrical power consumption, waste heat, and acoustic noise, which increases energy inefficiency and costs, particularly in environments where noise is a concern, and requires additional cooling measures to manage heat buildup.
Innovation Solution
A vacuum system with a control mechanism that adjusts the magnetic flux of the electric motor and cooling arrangement based on pumping requirements, reducing energy losses and noise by optimizing power and torque distribution, and controlling cooling dependent on flux values to minimize heat and noise generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the electric motor operates at high power to meet pumping requirements, then the pumping performance is improved, but energy losses and waste heat increase
Solution Approach 1:
The patent applies dynamic control of magnetic flux in the electric motor, adjusting the flux level according to the actual pumping requirements. At partial load conditions, the flux is reduced proportionally with the load, allowing the motor to operate more efficiently across varying pumping demands rather than maintaining constant high flux. This dynamic adjustment resolves the contradiction by enabling high pumping performance when needed while minimizing energy losses during normal operation.
Solution Approach 2:
The patent changes the magnetic flux parameter of the electric motor based on load conditions. By reducing the flux parameter at partial load, the motor achieves better efficiency and reduced energy losses. This parameter change is implemented through control of the motor's excitation current or field winding, allowing optimization of the motor's operating point to resolve the energy loss issue while maintaining pumping performance when required.
2Power
If the magnetic flux in the electric motor is increased to improve power output, then the power generation is improved, but waste heat and acoustic noise increase
Solution Approach 1:
The patent implements dynamic adjustment of magnetic flux in the electric motor, reducing flux at partial load conditions to minimize waste heat and acoustic noise generation. The flux is increased only when high power output is actually required for pumping demands, creating a dynamic balance between power generation and harmful factor reduction. This resolves the contradiction by making the flux level responsive to actual operational needs rather than maintaining constant high levels.
3Temperature
If additional cooling arrangements are added to remove waste heat, then the temperature control is improved, but energy consumption and system complexity increase
Solution Approach 1:
The patent converts the harmful waste heat from reduced flux operation into a benefit by using it to drive the vacuum pumping process more efficiently. By operating the motor at optimized flux levels, the overall system efficiency improves, and the heat generated is a natural byproduct of the pumping work rather than excess waste requiring additional cooling. This resolves the contradiction by reducing the need for additional cooling arrangements while maintaining temperature control.
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 approach reduces energy losses, minimizes waste heat, and decreases acoustic noise, leading to improved efficiency and reduced energy consumption, while maintaining system reliability and performance across varying load conditions.
Implementation Method 1
the control is arranged to control the magnetic flux generated in the electric motor
Implementation Method 2
a cooling arrangement for cooling the vacuum system
Data Source
Figure 1
Figure 2~6
AI summary
A vacuum pump (12) with dynamic control (16) of cooling fan (18) speed and motor (14) flux is provided to reduce transmitted noise and waste heat and provide a quieter, more efficient vacuum system (10).