Device management system for inverter compressor
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Solution Overview
Problem
Inverter compressors in air-conditioning systems face issues with partial discharges due to surge voltages, leading to insulation deterioration and potential motor burnout, which existing measures like corona-resistant wires and partial-discharge-free insulation structures cannot fully prevent, and they increase costs.
Innovation Solution
A device management system with a partial discharge detector and determination module to monitor motor voltages, detecting risks of partial discharges and performing protective operations to mitigate them, including controlling voltage, current, and pressure to prevent motor damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If corona-resistant wire made of nanocomposite material is used to increase the strength of the insulating coating, then the progress of insulation deterioration is retarded, but the method cannot stop insulation deterioration and finally causes dielectric breakdown and motor burnout, and the wire costs more than normal enameled wire
Solution Approach 1:
The patent applies preliminary action by detecting partial discharge early in the insulation deterioration process and taking preventive measures before complete breakdown occurs. The partial discharge detector monitors the insulation state continuously, and when partial discharge is detected, the control unit reduces the operating voltage or stops the motor, preventing catastrophic failure before it happens.
Solution Approach 2:
The patent implements feedback by using the partial discharge detector to continuously monitor the insulation condition and feed this information back to the control unit. Based on this feedback, the control unit dynamically adjusts the operating voltage or stops the motor, creating a closed-loop control system that prevents insulation failure.
2Reliability
If an insulation structure is reinforced by adding insulating paper or using insulating varnish or mold to create a partial-discharge-free insulation structure, then the partial discharge inception voltage is made higher than the surge voltage, but the usage environment is severe and insulation deterioration progresses with age, so a partial discharge may still occur
Solution Approach 1:
The patent applies preliminary action by detecting partial discharge early in the insulation deterioration process and taking preventive measures before complete breakdown occurs. The partial discharge detector monitors the insulation state continuously, and when partial discharge is detected, the control unit reduces the operating voltage or stops the motor, preventing catastrophic failure before it happens.
Solution Approach 2:
The patent implements feedback by using the partial discharge detector to continuously monitor the insulation condition and feed this information back to the control unit. Based on this feedback, the control unit dynamically adjusts the operating voltage or stops the motor, creating a closed-loop control system that prevents insulation failure.
3Object-affected harmful factors
If a strainer is provided in the refrigerant circuit to collect foreign matter, then some foreign matter can be collected, but it is impossible to completely prevent the refrigerant circuit from being damaged by the foreign matter, and in addition, it is hard to collect all the foreign matter, and the cost and maintenance cost are increased
Solution Approach 1:
The patent applies the taking out principle by extracting the partial discharge detection and protection functions from the mechanical protection system. Instead of adding physical components like strainers to the refrigerant circuit, the patent uses electrical detection methods to identify and respond to insulation deterioration, eliminating the need for complex mechanical protection systems.
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
The system effectively detects and mitigates partial discharges, reducing the risk of motor failure and extending the lifespan of inverter compressors by proactive intervention.
Implementation Method 1
a partial discharge detector configured to detect a voltage of the motor to detect a partial discharge that occurs in the motor
Data Source
AI summary
A device management system for an inverter compressor is a device management system for an inverter compressor provided with a motor to be driven by an inverter, and includes: a partial discharge detector that detects a voltage of the motor to detect a partial discharge that occurs in the motor; and a determination module that determines whether there is a risk of occurrence of the partial discharge or whether the partial discharge occurs based on a result of detection by the partial discharge detector. When the voltage detected by the partial discharge detector is higher than a first threshold, the determination module determines that there is a risk of the occurrence of the partial discharge or the partial discharge occurs, and performs a protective operation to reduce the risk of the occurrence of the partial discharge in the motor or the occurrence of the partial discharge in the motor.