Segmented Cooling Plates for Motor Eddy Current Suppression
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Solution Overview
Problem
Ultra-precision positioning servo systems face challenges in motor heat management, as excessive temperature rise affects reliability and positioning accuracy, and coreless motors are hindered by high current density losses.
Innovation Solution
A motor cooling and eddy current suppressing structure featuring non-magnetic metallic cooling plates with slits and a serpentine waterway design to reduce temperature and eddy currents, enhancing thrust density and structural strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high current density is used in coreless motor to increase thrust density, then motor output performance is improved, but motor temperature rise increases and reliability deteriorates
Solution Approach 1:
The cooling plate is divided into multiple independent cooling regions corresponding to different motor poles, with each region further segmented into sub-regions by slits. This segmentation allows localized cooling control and prevents eddy current formation while maintaining high current density operation.
Solution Approach 2:
A non-magnetic metallic cooling plate is introduced as an intermediary component between the motor winding and the cooling fluid. This cooling plate serves as a heat transfer medium that conducts heat away from the motor winding while its slit structure suppresses eddy currents, thereby enabling high current density operation without excessive temperature rise.
2Ease of manufacture
If conventional cooling structure is used, then manufacturing simplicity is maintained, but eddy currents are generated and cooling efficiency deteriorates
Solution Approach 1:
The cooling plate is divided into multiple independent cooling regions corresponding to different motor poles, with each region further segmented into sub-regions by slits. This segmentation allows localized cooling control and prevents eddy current formation while maintaining high current density operation.
Solution Approach 2:
Different regions of the cooling plate are designed with specific slit patterns and cooling channel configurations tailored to the local thermal and magnetic conditions of each motor pole region, optimizing cooling efficiency while suppressing eddy currents in each specific location.
3Device complexity
If motor temperature rise is allowed to increase, then cooling system complexity is reduced, but positioning accuracy deteriorates due to thermal stress and ambient temperature changes
Solution Approach 1:
The cooling plate with integrated cooling channels and slit structures serves multiple functions simultaneously: it cools the motor winding, suppresses eddy currents, and maintains structural support. This self-service design achieves effective temperature control without requiring additional complex cooling systems, thereby preserving positioning accuracy.
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 solution effectively inhibits motor winding temperature rise, improves thrust density, and reduces eddy currents, ensuring enhanced reliability and positioning accuracy in ultra-precision servo systems.
Implementation Method 1
a cooling water circuit located in between the first cooling plate and the second cooling plate; the cooling water circuit wherein configured to allow the cooling fluid to get through
Implementation Method 2
the cooling water circuit wherein configured to allow the cooling fluid to get through
Implementation Method 3
one or more first slits being provided on the first cooling plate in the position where the motor poles are combined, and by which the first cooling plate is divided into a plurality number of individual first regions which are corresponding to each pole of the motor
Data Source
AI summary
A motor cooling and eddy current suppression structure (100), which is attached to the surface of the motor winding (201), includes a first cooling plate (101), a second cooling plate (103,104), and a cooling water circuit located between the first cooling plate and the second cooling plate. The cooling water circuit is configured to allow the cooling fluid to pass through. The first and the second cooling plates are both non-magnetic metallic materials. The first cooling plate is divided into a plurality of individual first regions (301,303) which are corresponding to each pole of the motor by one or more first slits (305) provided on the first cooling plate in the position where the motor poles are combined. Each of the first regions is further divided into an even number of first sub-areas by at least one fist sub-slit (306) where induced electromotive force is generated. Two adjacent first sub-areas in respective first regions are grouped together, and the ends of each first sub-area that has the same polarity are connected in series. The second cooling plate is divided into a plurality of individual second regions which are corresponding to each pole of the motor by one or more second slits provided on the second cooling plate in the position where the motor poles are combined. Each of the second regions is further divided into an even number of second sub-areas by at least one second sub-slit where induced electromotive force is generated. Two adjacent second sub-areas in respective second regions are grouped together, and the ends of each second sub-area that has the same polarity are connected in series. This structure can efficiently reduce the temperature of the motor winding and reduce the induced eddy current.