Inverter Pulse Insulation Testing for Surge-Induced Partial Discharge
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Solution Overview
Problem
Inverter-driven motors experience partial discharges due to surge voltages generated by high-speed pulse control, leading to insulation deterioration, which existing test methods fail to accurately assess.
Innovation Solution
An inverter pulse insulation test device with a pulse generation circuit and surge voltage generation circuit, utilizing variable resistors, inductors, and capacitors to simulate drive voltage waveforms and generate surge voltages, allowing for precise evaluation of insulation deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the thickness of the insulation coating of the winding is increased to suppress the partial discharge, then the partial discharge is suppressed, but the size of the motor increases
Solution Approach 1:
The patent applies the principle of converting harm into benefit by utilizing the surge voltage generation circuit to intentionally generate controlled surge voltages that simulate real operating conditions. Instead of simply increasing insulation thickness to prevent partial discharge, the system creates a test environment where surge voltages are deliberately applied to accurately assess insulation durability under actual operating stress, thereby obtaining reliable test data without requiring excessive insulation thickness
Solution Approach 2:
The patent employs parameter changes by using variable resistors, inductors, and capacitors in the surge voltage generation circuit to dynamically adjust the surge voltage characteristics. This allows the test device to vary voltage amplitude, rise/fall times, and frequency to comprehensively evaluate insulation performance across different operating conditions, providing more accurate assessment data than static insulation thickness alone
2Speed
If the carrier frequency of the pulse control is increased, then the motor response speed is improved, but the partial discharge occurs more frequently and the insulation properties deteriorate faster
Solution Approach 1:
The patent applies periodic action by using the pulse generation circuit to output voltage pulses at variable frequencies, including high carrier frequencies that simulate real inverter operation. The surge voltage generation circuit then processes these periodic pulses to create corresponding surge voltage waveforms. This allows the test device to reproduce and evaluate insulation durability under high-frequency pulsing conditions that cause frequent partial discharges, providing data on insulation performance at the actual operating speeds
3Ease of operation
If existing test methods are used, then the test process is simple, but the insulation deterioration level cannot be accurately assessed
Solution Approach 1:
The patent introduces an intermediary approach by incorporating a surge voltage generation circuit as a mediator between the pulse generation circuit and the test object. This intermediary circuit processes the basic voltage pulses into realistic surge voltage waveforms that include rise/fall times and oscillations characteristic of actual inverter operation. The intermediary surge voltage generation enables accurate insulation assessment by creating test conditions that truly reflect operational stress, while maintaining a relatively simple overall test setup
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
Accurately tests and evaluates the insulation coating's deterioration level due to surge voltages, simulating real-world conditions to assess insulation integrity effectively.
Implementation Method 1
due to the inductance of the wiring from the power device to the motor, a surge voltage is generated at the rise and the fall of the voltage pulse
Implementation Method 2
The surge voltage generation circuit has: a variable resistor and a variable inductor connected in series to each other; and a variable capacitor
Implementation Method 3
the surge voltage generation circuit changes the drive voltage waveform by generating a surge voltage at a rise and a fall of each pulse of the drive voltage waveform
Data Source
AI summary
The present invention provides an inverter pulse insulation test device comprising a pulse generation circuit and a surge voltage generation circuit. The pulse generation circuit outputs a voltage having a simulated drive voltage waveform that includes intermittent pulses. The surge voltage generation circuit generates a surge voltage at each of a rise and a fall of each pulse of the drive voltage waveform to change the drive voltage waveform and outputs a voltage having the changed drive voltage waveform. The surge voltage generation circuit has: a variable resistor and a variable inductor connected in series to each other; and a variable capacitor.