Direct Drive Control for Smooth Mover Transition and Thrust Compensation
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Solution Overview
Problem
Existing direct drive transmission systems face issues with driver universality and thrust loss during mover transitions between stators.
Innovation Solution
A direct drive system with a controller that switches between position and current modes based on relative position information, allowing drivers to adjust current in windings to maintain thrust and compensate for losses without custom modifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If master-slave switching control is used to achieve smooth transition of mover between stators, then the mover can be driven smoothly, but the driver functions have to be customized and modified which affects universality
Solution Approach 1:
The patent divides the control process into distinct segments: position mode for normal operation and current mode for transition periods. This segmentation allows each mode to be optimized independently, with position mode using standard driver functions and current mode handling the specialized transition requirements, thereby maintaining driver universality while achieving smooth mover transitions.
Solution Approach 2:
The patent implements dynamic mode switching between position mode and current mode based on the mover's position and operational state. The controller automatically transitions between control modes to match the operational requirements at different stages, enabling smooth mover transitions without requiring permanent customization of driver functions.
2Ease of operation
If master-slave switching control is used for mover transition, then smooth transition can be achieved, but during transition there are periods with single master control which leads to thrust loss
Solution Approach 1:
The patent applies preliminary action by introducing current mode control that activates before the mover fully transitions between stators. This preliminary current support ensures thrust is maintained during the transition period, preventing the thrust loss that would otherwise occur during single-master control periods.
Solution Approach 2:
The patent introduces an intermediary current mode control mechanism that acts as a bridge between position mode controls during transitions. This intermediary control provides the necessary thrust support during transition periods, preventing gaps in force application while maintaining smooth mover movement.
3Measurement precision
If driver functions are customized for specific control modes, then control precision can be improved, but device complexity increases
Solution Approach 1:
The patent makes the driver universal by enabling it to operate in multiple modes (position mode and current mode) through software or control logic configuration rather than hardware customization. This multi-functionality approach maintains control precision while avoiding the complexity of customized driver designs.
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 system ensures normal movement of movers by adjusting thrust in position mode and compensates for thrust losses in current mode, enhancing driver universality and reducing thrust-related issues.
Implementation Method 1
The at least one winding is configured to generate thrust between the at least one winding and the at least one magnetic steel by generating a traveling-wave magnetic field when the at least one winding is energized
Implementation Method 2
The at least one winding is configured to generate thrust between the at least one winding and the at least one magnetic steel by generating a traveling-wave magnetic field
Data Source
AI summary
The present disclosure provides a direct drive system, a control method for the same, an electronic device and a storage medium. In the direct drive system, the plurality of primary units are designed to have the position mode and the current mode. In the position mode, a position control instruction is output according to the absolute position information of a mover on the guide rails and predetermined positions of the mover on the guide rails, in order for a respective driver to adjust current in at least one winding primary unit according to the position control instruction, to move the respective mover to a predetermined position. In the current mode, a current control instruction is output, in order for the respective driver to provide current to the at least one winding according to the current control instruction, to compensate a thrust loss occurred in movement of the respective mover.