Air Compressor Motor Inductance Design
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Solution Overview
Problem
Conventional air compressor motors in fuel cell systems face challenges with low inductance, leading to increased current ripple and cooling issues, which are exacerbated by the need for additional cooling devices when external inductors are used to address these problems.
Innovation Solution
A motor design that includes a second coil wound in opposition to the first coil within the motor to increase inductance, maintaining the motor's characteristics and utilizing existing cooling systems, thereby reducing current ripple and cooling costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the inductance is increased by using a coil necessary to drive a motor, then the inductance is improved, but the characteristics of the motor may be changed
Solution Approach 1:
The patent divides the coil system into two separate coils: a first coil for generating magnetic flux to drive the motor, and a second coil specifically for increasing inductance. This segmentation allows each coil to perform its dedicated function independently, preventing interference between motor drive characteristics and inductance requirements
Solution Approach 2:
The patent combines the first coil and second coil within the same motor structure, where the second coil is positioned in the same space as the first coil. This merging allows the motor to achieve increased inductance without adding external components, while the opposing winding directions ensure that the magnetic fluxes cancel out to maintain motor characteristics
2Volume of moving object
If an external inductor (coil) is provided between the inverter and the motor to increase the inductance, then the inductance is improved, but a cooling device to cool heat generated from the external inductor is additionally necessary
Solution Approach 1:
The patent merges the inductance-increasing function into the motor itself by incorporating the second coil within the motor structure. This eliminates the need for separate external inductors and their associated cooling devices, as the second coil is already integrated into the motor's thermal management system
Solution Approach 2:
The motor structure itself provides the cooling function for the second coil through its existing cooling pathways and thermal management design. The second coil utilizes the motor's inherent cooling capabilities rather than requiring an independent cooling system, making the overall system more compact and simpler
3Speed
If the inductance is designed to have a low value in the range from tens of μHs to hundreds of μHs, then the motor speed is improved, but the peak current increases to increase the ripple of the current input into the motor
Solution Approach 1:
The patent segments the coil functions into two distinct coils, allowing the first coil to optimize for high-speed performance with low inductance while the second coil independently provides the necessary inductance increase to reduce current ripple, thereby resolving the trade-off between speed and current stability
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 increased inductance reduces current ripple and improves efficiency without altering the motor's performance or requiring additional cooling devices, enhancing the air compressor's performance while maintaining compact size.
Implementation Method 1
a stator including a first coil to generate a magnetic flux for driving the motor
Implementation Method 2
a second coil positioned in a space the same as a space for the first coil to increase an inductance
Implementation Method 3
The two coils are wound in directions opposite to each other to cancel magnetic fluxes generated to face each other
Implementation Method 4
a rotator to mutually interact with the stator to rotate, including an N pole permanent magnet and an S pole permanent magnet
Data Source
AI summary
A motor for an air compressor is provided. The motor includes a stator including a first coil to generate a magnetic flux for driving the motor and a second coil positioned in a space the same as a space for the first coil to increase an inductance, and a rotator to mutually interact with the stator to rotate.