Parallel Cooling Ducts for Motor Drive Heat Sinks
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Solution Overview
Problem
In motor drive systems, compact packaging leads to increased heat generation and reduced cooling efficiency, limiting the motor's power output and reliability due to inefficient heat dissipation, especially as workload and temperature vary.
Innovation Solution
A motor drive cooling duct system with parallel air flow channels dedicated to each heat sink, utilizing guide vanes and baffled walls to optimize air flow and minimize temperature gradients across heat sinks, ensuring efficient heat dissipation without preheating downstream components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a built-in cooling channel is used to provide cool air to components, then the packaging can be compact, but the cooling efficiency deteriorates because air is heated as it travels through the channel, causing diminished cooling effect at the exhaust end
Solution Approach 1:
The cooling channel is divided into multiple parallel channels instead of a single long channel. This segmentation allows cool air to reach multiple components simultaneously without traveling through a long heated path, maintaining cooling efficiency while preserving compact packaging.
Solution Approach 2:
The cooling approach transitions from a single linear path to a multi-dimensional parallel channel structure. By distributing cooling air across multiple parallel pathways, the system achieves better thermal management in a compact volume by utilizing spatial distribution rather than sequential cooling.
2Volume of moving object
If compact packaging is used to reduce size, then the device footprint is reduced, but heat dissipation becomes less efficient, limiting motor power levels
Solution Approach 1:
The cooling system is segmented into multiple parallel channels that distribute cool air to different components simultaneously. This allows effective heat dissipation from multiple power semiconductors without requiring a large device footprint, as each channel provides dedicated cooling pathways.
Solution Approach 2:
Each parallel cooling channel is optimized for its specific component's cooling needs, providing localized cooling quality. This ensures that each power semiconductor receives appropriate cooling attention, maintaining high heat dissipation efficiency in a compact overall device structure.
3Device complexity
If a single cooling channel serves multiple components, then the structure is simple, but temperature gradients across heat sinks increase, reducing thermal performance
Solution Approach 1:
The cooling system is divided into multiple independent parallel channels, each serving specific components. This segmentation reduces temperature gradients by providing direct cooling pathways to each component, preventing the accumulation of temperature differences that would occur in a single long channel.
Solution Approach 2:
The system uses multiple parallel cooling channels, providing more cooling capacity than a single channel would offer. This excessive action ensures that even components at the farthest distances receive adequate cooling, minimizing temperature gradients across all heat sinks.
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 solution enhances cooling efficiency by maintaining high thermal performance with reduced air flow resistance, allowing the motor drive to operate at higher power levels with improved reliability and reduced risk of failure.
Implementation Method 1
A guide vane adjacent to the inverter duct may control the flow of cooling air from a blower between the first and second duct channels
Implementation Method 2
the inverter duct and the converter duct may both include baffled walls that direct cooling air into contact with the inverter heat sink and the converter heat sink
Implementation Method 3
baffled walls that direct cooling air into contact with the inverter heat sink and the converter heat sink, such that temperature gradients across the heat sinks are minimized
Data Source
AI summary
The present invention relates generally to tuning the flow of cooling air across converter and inverter heat sinks in a motor drive system. More specifically, present techniques relate to motor drive duct systems having parallel cooling air duct channels dedicated to providing cooling air for a converter heat sink and an inverter heat sink, respectively. In particular, a first duct channel through an inverter duct and a converter duct is dedicated to providing cooling air to the converter heat sink without cooling the inverter heat sink, whereas a second duct channel through the inverter duct and the converter duct is dedicated to providing cooling air to the inverter heat sink without cooling the converter heat sink.