Spindle Device Heat Dispersion Segmentation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
High-precision spindle devices using static pressure bearings face challenges with heat generation and cooling issues at high speeds, leading to spindle deformation and potential failure, as conventional cooling methods are inadequate for effectively dissipating heat generated by motor coils and magnets.
Innovation Solution
A built-in motor type spindle device with two lines of magnets or conductors on the spindle and two pairs of coils on the housing, where the magnets or conductors are arranged with opposite polarity poles or phases shifted, and coils wound around cores with skewed phases, combined with a cooling jacket for efficient heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the spindle speed is increased to improve working efficiency, then productivity increases, but heat generation in the static pressure bearings increases due to shearing of the pressure transmission medium
Solution Approach 1:
The patent divides the single motor structure into two separate motors (first and second motors) with separate coil assemblies. This segmentation allows independent control and heat dissipation paths for each motor, reducing concentrated heat generation in the bearing region while maintaining total driving power for high-speed operation.
Solution Approach 2:
The patent transitions from a conventional single-plane motor configuration to a three-dimensional arrangement where two motors are positioned at different angular positions (first and second directions) around the spindle. This spatial distribution separates heat sources in the radial dimension, improving heat dissipation efficiency while enabling higher spindle speeds for improved productivity.
2Temperature
If two lines of magnets and two pairs of coils are used to disperse heat generation, then thermal management improves, but device complexity increases
Solution Approach 1:
The patent designs the two motor assemblies to be substantially identical in structure, with each containing a complete set of magnets and coils. This universal design allows the system to achieve heat dispersion through replication rather than creating complex asymmetric structures, reducing design and manufacturing complexity while maintaining thermal management benefits.
Solution Approach 2:
The patent changes the spatial parameters of the motor configuration by positioning two identical motor assemblies at different angular positions around the spindle. This parameter change (angular positioning) achieves heat dispersion without modifying the internal structure of individual motors, maintaining simplicity while improving thermal management through geometric arrangement.
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 configuration allows for efficient cooling of the spindle, reduces torque fluctuations, and enables higher rotational accuracy and machining precision by dispersing heat generation, preventing spindle overheating and deformation, and maintaining high-speed operation without increasing moment of inertia.
Implementation Method 1
two lines of magnetic field generating members disposed on the spindle, and two pairs of coils provided on the housing and facing the magnetic field generating members respectively
Implementation Method 2
static pressure bearings which support the spindle so that the spindle can rotate freely with respect to the housing
Data Source
AI summary
A built-in motor type spindle device comprising a housing and a spindle, wherein said spindle device further includes static pressure bearings which support the spindle so that the spindle can rotate freely relatively to the housing, two lines of magnetic field generating members which are provided on the spindle, and two pairs of coils which are provided on the housing and respectively face the magnetic field generating members and since the spindle device circumferentially disperses the which magnetic field generating members generate heat, the spindle device can prevent the spindle from being hot locally and further, since the surface area of the magnetic field generating members on the spindle are made larger, they can be cooled more effectively than one line of magnetic field generating members.