Linear Motor Primary Part Cooling Plate Design
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Solution Overview
Problem
Existing linear motor cooling solutions either reduce the motor's power by decreasing the fill factor or increase its height and alter the air gap when retrofitted with cooling plates, making them unsuitable for maintaining performance and space constraints.
Innovation Solution
A flat cooling plate with transversely extending cooling channels connected to a distributor, which supplies and discharges coolant laterally between the winding end turns and the primary part, maintaining the air gap and allowing for efficient heat dissipation without significant changes to the motor's electrical parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If cooling channels are formed between the coil-carrying teeth of the iron core, then cooling effect is improved, but the fill factor is reduced and motor power decreases
Solution Approach 1:
The cooling channels are relocated from the radial direction (between teeth) to the axial direction (at the rear side of the lamination stack). This dimensional shift allows cooling without encroaching on the active magnetic area, thus maintaining fill factor and power while achieving effective cooling through the rear side path.
2Temperature
If a cooling plate with large cross-sectional cooling channels is used, then cooling efficiency is improved, but the plate height increases and air gap is altered
Solution Approach 1:
Instead of using a single large cooling channel that requires significant plate thickness, the invention employs multiple smaller cooling channels distributed across the cooling plate. This local distribution approach achieves sufficient cooling capacity while keeping each individual channel small, allowing the plate to remain thin and not significantly alter the air gap.
Solution Approach 2:
The cooling plate is divided into multiple segments with distributed cooling channels rather than one large channel. The cooling plate includes a first cooling channel and a second cooling channel spaced apart, creating a segmented cooling system that reduces the required plate thickness while maintaining effective heat dissipation across the entire rear side area.
3Temperature
If meandering cooling channels are formed in the rear side, then uniform cooling distribution is achieved, but manufacturing complexity increases due to difficult milling operations
Solution Approach 1:
The meandering cooling path is segmented into multiple straight cooling channels (first cooling channel, second cooling channel, etc.) arranged in parallel. Each channel is a simple straight passage that is easy to manufacture, yet collectively they provide uniform cooling distribution across the rear side of the lamination stack without requiring complex meandering millings.
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 enhances heat dissipation, increasing the continuously deliverable force and motor current while maintaining the air gap and electrical parameters of the linear motor, making it suitable for retrofitting without altering the motor's dimensions.
Implementation Method 1
The cooling channels are connected to a coolant inlet and a coolant outlet via channels of a distributor... enhancing heat dissipation
Implementation Method 2
The area between the winding end turns projecting from the lamination stack is filled with a thermally conductive potting compound
Data Source
AI summary
A primary part of a linear motor includes a cooling plate with cooling channels mounted to a side of the primary part that faces away from an air gap of the linear motor. The cooling channels are connected to a coolant inlet and a coolant outlet via channels of a distributor. The channels extend between the cooling plate and winding end turns of the primary part in a direction of movement of the linear motor.