Grinding Spindle Magnetic Bearing Control for Ring-Specific Precision
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Solution Overview
Problem
Grinding machines with magnetic bearings face challenges in maintaining optimal rotor dynamics due to varying forces during wheel dressing and grinding operations, which affect the geometric quality of ground surfaces, especially when dealing with different types of rolling bearing rings.
Innovation Solution
A method and device for controlling the spindle of a grinding machine that determines the type of rolling bearing ring and selects appropriate control coefficients for magnetic bearings, adapting the driving of magnetic bearings based on the operation phase (dressing or grinding) to optimize rotor guidance and precision, using two radial and one axial magnetic bearing with stored sets of control coefficients for different types of rings and wheels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If magnetic bearings are used to maintain rotor rotation at high speeds, then productivity is improved, but manufacturing precision deteriorates due to varying forces during different operations
Solution Approach 1:
The control coefficients of the magnetic bearings are made dynamic by selecting different predetermined sets based on the operation phase (dressing or grinding) and ring type. This allows the bearing control to adapt to varying forces during different operations, maintaining manufacturing precision while enabling high-speed rotation for improved productivity
Solution Approach 2:
The invention changes the control parameters (coefficients) of the magnetic bearings according to the operation phase and ring type. By switching between different predetermined sets of coefficients, the system optimizes rotor guidance for each specific operation, resolving the contradiction between high-speed operation and precision maintenance
2Device complexity
If a single set of control coefficients is used for magnetic bearings, then device complexity is reduced, but manufacturing precision deteriorates due to inability to adapt to varying forces
Solution Approach 1:
Multiple sets of control coefficients are predetermined and stored in advance for different operation phases and ring types. This preliminary preparation allows the control system to simply select from pre-optimized sets rather than calculating optimal coefficients in real-time, maintaining low device complexity while achieving high manufacturing precision through adaptive selection
3Manufacturing precision
If magnetic bearing control is adapted to different operation phases and ring types, then manufacturing precision is improved, but device complexity increases due to multiple control coefficient sets
Solution Approach 1:
The control system uses feedback from the operation phase detection and ring type identification to automatically select the appropriate predetermined set of control coefficients. This feedback mechanism enables the system to adapt to different conditions and maintain high manufacturing precision without requiring complex real-time calculations, as the selection is based on predefined categories
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 approach enhances the precision and quality of grinding operations by adapting magnetic bearing control to specific forces, ensuring consistent and improved surface quality across various types of rolling bearing rings.
Implementation Method 1
the rotor is maintained in rotation using magnetic bearings
Data Source
AI summary
A device (21) for controlling a spindle of a grinding machine (1) is disclosed. The spindle includes a rotor (5) supported by two radial magnetic bearings, one axial bearing, and a grinding wheel (6). The device includes a storage means (22) for storing control coefficients of the magnetic bearings. The device includes a means for determining a type of the grinding wheel and a type of the rolling bearing ring. A selection means (23) selects control coefficients associated with the determined types of grinding wheel and of rolling bearing ring from among the control coefficients stored in the storage means. The device also includes a means (23) for controlling the radial and axial magnetic bearings. Said means controlling the radial and axial (12) magnetic bearings on the basis of the control coefficients of the determined types of grinding wheel and of rolling bearing ring.