Stator Neutral Fuse Cutoff for Inverter Short-Circuit Protection
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Solution Overview
Problem
Existing motor drive devices face increased power consumption due to the relatively large resistance value of semiconductor relays used to suppress brake torque during inverter short-circuit failures.
Innovation Solution
Incorporating a heater-integrated fuse in the stator coil or connection circuit that cuts the fuse when a short-circuit failure is detected, reducing power consumption by lowering resistance compared to semiconductor relays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a semiconductor relay is used to suppress brake torque during inverter short-circuit failures, then the brake torque suppression function is improved, but the power consumption increases due to the relatively large resistance value
Solution Approach 1:
The invention divides the protection function into two stages: a semiconductor relay provides initial short-circuit protection, while a heater-integrated fuse provides secondary protection with lower resistance. This segmentation allows the system to benefit from both the fast response of the semiconductor relay and the low power consumption of the heater-integrated fuse during sustained fault conditions.
Solution Approach 2:
The invention changes the resistance parameter by introducing a heater-integrated fuse with lower resistance compared to the semiconductor relay. The heater-integrated fuse maintains circuit interruption capability while reducing the resistance value, thereby lowering power consumption during fault conditions without sacrificing the brake torque suppression function.
2Reliability
If a semiconductor relay is used to interrupt the circuit during inverter failures, then the circuit interruption function is improved, but the resistance value increases leading to higher power loss
Solution Approach 1:
The heater-integrated fuse acts as an intermediary component with lower resistance than the semiconductor relay. It provides an alternative current interruption path that reduces power loss while maintaining the circuit interruption function during inverter failures.
Solution Approach 2:
The heater-integrated fuse is designed as a sacrificial component that can be replaced after operation. It provides reliable circuit interruption with lower resistance and power loss, accepting that it will be consumed during fault conditions rather than being a permanent, high-resistance solution.
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 motor drive device effectively reduces power consumption by using a heater-integrated fuse to interrupt the circuit during inverter short-circuit failures, improving efficiency and minimizing brake torque.
Implementation Method 1
a heater-integrated fuse is provided in a stator coil or a connection circuit for connecting the stator coil and an inverter to each other, and when a short-circuit failure of the inverter is detected, a fuse part of the heater-integrated fuse is cut by heating
Data Source
AI summary
A heater-integrated fuse is provided at a neutral point of a stator coil, and when a short-circuit failure of an inverter is detected, a fuse part of the heater-integrated fuse is cut by heating.