Centrifuge Control Using Angle Sensor Pulses for Precise Sediment Homogeneity
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Solution Overview
Problem
Existing centrifuge motor control solutions are complex and costly, and they fail to provide efficient and precise control, especially for special applications like maintaining a homogeneous sediment distribution in a cuvette during centrifugation.
Innovation Solution
A control method using pulses from an angle sensor to track the position and control the speed of a centrifuge, allowing for efficient and precise control through pulse width modulation (PWM) signals, enabling smooth deceleration without jerks and precise positioning, applicable to various motor types including DC, AC, and stepping motors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If complex feedback control systems are used for motor control, then control precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent implements feedback control by evaluating the time difference between consecutive angle sensor pulses and comparing it against predetermined thresholds. This simple feedback mechanism enables precise control of acceleration, holding, and deceleration phases without requiring complex control systems, thereby achieving high measurement precision while maintaining low device complexity
Solution Approach 2:
The angle sensor pulses serve dual purposes: they provide position information for tracking and simultaneously provide speed information through time difference evaluation. This self-service approach eliminates the need for separate speed sensors or complex control circuits, reducing device complexity while maintaining control precision
2Device complexity
If simple motor control is used, then device complexity is reduced, but control precision and positioning accuracy deteriorate
Solution Approach 1:
The patent dynamically adjusts motor control based on the evaluation phase (acceleration, holding, or deceleration) by comparing time differences between angle sensor pulses against phase-specific thresholds. This dynamic control approach enables precise positioning accuracy using simple control logic, achieving high measurement precision without increasing device complexity
Solution Approach 2:
The control system operates in periodic phases (acceleration, holding, deceleration) with predetermined time thresholds. By structuring control around these periodic phases and using angle sensor pulses to trigger phase transitions, the patent achieves precise positioning accuracy through simple, rhythm-based control logic
3Productivity
If high-speed rotation is maintained throughout centrifugation, then productivity is improved, but sediment distribution homogeneity deteriorates
Solution Approach 1:
The patent implements periodic acceleration and deceleration phases during centrifugation by evaluating time differences between angle sensor pulses against predetermined thresholds. This periodic speed variation ensures homogeneous sediment distribution while maintaining overall centrifugation efficiency, resolving the contradiction between productivity and sediment homogeneity
Data Source
AI summary
A control method for a centrifuge is performed by a motor drive unit to drive a motor of the centrifuge using pulses from an angle sensor. The method has a start phase, a regulated acceleration phase, a holding phase, a regulated deceleration phase, a regulated gentle deceleration phase, and a position adjustment phase.