Fluid Rotary Machine Encoder Module for Precise Shaft Control
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Solution Overview
Problem
Existing fluid rotary machines face challenges in achieving flexible and accurate control of rotational movements of the output shaft due to mechanical coupling between the valve element and output shaft, making them less flexible and less accurate, especially under external condition changes such as pressure variations.
Innovation Solution
The fluid rotary machine incorporates a first movement chain with a motor shaft coupled to a valve element, a second movement chain with a gear wheel and cardan shaft, and an encoder module to detect rotational movements, allowing independent control of the valve element and output shaft through a motor control unit, enabling flexible and accurate control of rotational speed and direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the valve element is mechanically coupled to the output shaft, then the structure is simpler, but the control flexibility and accuracy deteriorate under external condition changes
Solution Approach 1:
The system is divided into two independent movement chains: the first movement chain controls the valve element position, and the second movement chain controls the output shaft rotation. This segmentation allows independent control of each function, resolving the contradiction by eliminating the mechanical coupling while maintaining separate operational capabilities.
Solution Approach 2:
A sensor arrangement acts as an intermediary to detect the rotational position of the output shaft and provide feedback signals. This intermediary enables the control system to adjust the valve element position based on actual output shaft position, achieving accurate control without direct mechanical coupling.
2Volume of moving object
If the valve element rotation is directly coupled to the output shaft rotation, then the mechanism is more compact, but the positioning accuracy deteriorates
Solution Approach 1:
The sensor arrangement continuously detects the rotational position of the output shaft and feeds this information back to the control system. This feedback enables real-time adjustment of the valve element position to achieve precise positioning control independent of the output shaft's mechanical position.
Solution Approach 2:
The direct mechanical coupling between valve element and output shaft is replaced with an electronic control system. The motor-driven valve element positioning is controlled electronically based on sensor feedback, substituting mechanical precision requirements with electronic control precision.
3Device complexity
If mechanical coupling is used between valve element and output shaft, then fewer components are needed, but control accuracy under pressure variations deteriorates
Solution Approach 1:
The sensor arrangement provides continuous feedback on the output shaft rotational position, enabling the control system to compensate for pressure variations and maintain accurate positioning control. This feedback mechanism ensures reliable operation under varying external conditions.
Solution Approach 2:
The system transitions from a static mechanical coupling to a dynamic electronic control system. The valve element position can be dynamically adjusted based on real-time sensor feedback, allowing the system to adapt to pressure variations and maintain control accuracy.
Data Source
AI summary
A fluid rotary machine (100, 200) includes a first movement chain with a motor (101, 201) including a motor shaft (102, 202) rotationally coupled to a valve element (103, 203), for example a disc valve element (103) or a spool valve element (203), and a motor control unit configured to control rotational movement of the motor shaft (102, 202). The valve element (103, 203) is configured to control a fluid flow to a gear wheel (114, 214) of a second movement chain. The second movement chain includes the gear wheel (114, 214), a cardan shaft (116, 216) and an output shaft (117, 217), wherein the cardan shaft (116, 216) is rotationally coupled to the gear wheel (114, 214) and the output shaft (117, 217). In order to provide an improved fluid rotary machine, which especially allows more flexible and accurate control of rotational movements of components (114, 214, 116, 216, 117, 217) of the second movement chain are rotatable relative to the motor shaft (102, 202). Further, an encoder module (110, 210) includes a sensor arrangement configured to detect rotational movement of a component of the second movement chain, for example, of the cardan shaft (116, 216) and/or the output shaft (117, 217) is provided.