Gear Pump Noise Reduction via Uneven Pitch-Simulated Current Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Gear pumps, particularly electric hydraulic pumps, generate noise due to the even disposition of teeth, which cannot be mitigated by uneven pitch arrangements since structural changes are not feasible.
Innovation Solution
Implementing an uneven pitch-simulated control by calculating and varying the control current values for each tooth of the gear pump based on its number, order, and angle, and applying these values to the motor control signal to reduce noise without altering the gear pump's structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If uneven pitch arrangement is applied to reduce noise, then noise is reduced, but it cannot be applied to gear pumps with evenly disposed teeth
Solution Approach 1:
The patent replaces the mechanical uneven pitch arrangement with an electronic control system that adjusts motor current based on tooth position. Instead of physically modifying gear tooth positions, the system uses sensors to detect tooth position and varies motor current accordingly to simulate the noise-reducing effect of uneven pitch arrangement.
Solution Approach 2:
The patent changes the electrical parameter (motor current) as a function of tooth position to achieve noise reduction. By varying current magnitude based on detected tooth position, the system creates an effective uneven pitch pattern without physical modification, resolving the contradiction between maintaining even tooth disposition and reducing noise.
2Device complexity
If evenly disposed teeth are used in gear pump, then structural simplicity is maintained, but noise is generated in frequency band corresponding to number of teeth
Solution Approach 1:
The patent substitutes mechanical structural modification with electronic control. The even tooth disposition is preserved mechanically, while noise is reduced through electronic modulation of motor current based on tooth position detection, thereby maintaining structural simplicity while eliminating noise.
Solution Approach 2:
The patent introduces an intermediary control system between the motor and gear pump. This intermediary system includes position sensors and a controller that modulates motor current, acting as a mediator that decouples the direct relationship between even tooth disposition and noise generation.
3Object-affected harmful factors
If control current values are varied for each tooth, then noise is reduced through uneven pitch simulation, but control system complexity increases
Solution Approach 1:
The patent replaces complex mechanical modifications with a relatively simple electronic control system. By using position sensors and programmable current control, the system achieves noise reduction through software algorithms rather than complex mechanical mechanisms, managing control complexity more effectively.
Data Source
AI summary
An apparatus for reducing noise of a gear pump through uneven pitch-simulated control includes a calculation unit to calculate different control current values for each tooth of a teeth order by applying a teeth number, the teeth order, and a teeth angle of the gear pump in which a plurality of teeth are evenly formed, a storage unit to map and store the teeth order and the different control current values corresponding to the teeth order for each tooth, and a current controller to variably generate the control current value mapped corresponding to the teeth order when each tooth reaches a reference position when the gear pump rotates by a motor, wherein the control current value is added to a reference current value of a motor control signal and applied to the motor.