Compressor Motor PWM for Preheating With Closed Voltage Vector Loops
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Solution Overview
Problem
Existing techniques for controlling inverters to generate preheating heat in compressor motors are inefficient and require complex control processing, often involving high-frequency heating methods that increase storage capacity needs.
Innovation Solution
A pulse width modulation method that forms a loop of integrals of unit voltage vectors within a control cycle, using at least three types of non-zero voltage vectors to increase heating value, allowing for preheating heat generation without complex control processing by adjusting vector widths and frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-frequency heating methods are used to generate preheating heat, then preheating efficiency is improved, but device complexity and storage capacity requirements increase
Solution Approach 1:
The patent changes the control parameters by forming a loop of integrals of unit voltage vectors within a control cycle and adjusting vector widths and frequencies. This approach generates preheating heat through controlled voltage vector integration rather than high-frequency switching, achieving effective preheating while reducing control complexity and storage requirements
Solution Approach 2:
The patent employs periodic action by forming loops within control cycles T0, where the locus of integrals of unit voltage vectors creates closed trajectories. This periodic loop formation generates the necessary heating effect through controlled cyclic voltage application, avoiding the need for continuous high-frequency switching while maintaining preheating effectiveness
2Productivity
If high-frequency heating methods are used to generate preheating heat, then preheating efficiency is improved, but storage capacity requirements increase
Solution Approach 1:
The patent changes the control parameters by forming a loop of integrals of unit voltage vectors within a control cycle and adjusting vector widths and frequencies. This approach generates preheating heat through controlled voltage vector integration rather than high-frequency switching, achieving effective preheating while reducing control complexity and storage requirements
3Productivity
If complex control processing is used to generate preheating heat, then preheating effectiveness is improved, but ease of operation deteriorates
Solution Approach 1:
The patent changes the control parameters by forming a loop of integrals of unit voltage vectors within a control cycle and adjusting vector widths and frequencies. This approach generates preheating heat through controlled voltage vector integration rather than high-frequency switching, achieving effective preheating while reducing control complexity and storage requirements
Solution Approach 2:
The patent employs periodic action by forming loops within control cycles T0, where the locus of integrals of unit voltage vectors creates closed trajectories. This periodic loop formation generates the necessary heating effect through controlled cyclic voltage application, avoiding the need for continuous high-frequency switching while maintaining preheating effectiveness
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 method effectively generates preheating heat in compressor motors with increased efficiency and reduced unwanted iron loss, simplifying control processing and storage requirements.
Implementation Method 1
a compressor motor is caused to generate preheating heat
Implementation Method 2
a technique for generating preheating heat with iron loss of the compressor
Data Source
AI summary
A locus of integrals, in terms of time, of unit voltage vectors forms a loop within a period shorter than a reciprocal of a maximum value of an operating frequency, in terms of electrical angle, of a compressor motor, the unit voltage vectors being voltage vectors that are units composing an instantaneous space vector indicating voltage which an inverter for driving the compressor motor outputs except in a dead time period.