Electrodynamic Actuator Vibration Compensation Nested Drive
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Solution Overview
Problem
Existing electrodynamic actuators suffer from unwanted vibrations due to the vibration of the primary voice coil, leading to bulky and technically complex vibration compensation systems that are only partially effective.
Innovation Solution
The introduction of a secondary drive system with an annular secondary voice coil and magnet system nested within the primary magnet system, allowing for improved vibration compensation by adjusting the secondary gain and phase shift to minimize acceleration caused by sound input signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a distinct mass is moved in antiphase with the primary voice coil to compensate vibrations, then vibration compensation is achieved, but the device becomes bulky and technically complicated
Solution Approach 1:
The patent combines the vibration compensation function with the existing electrodynamic actuator structure by integrating a secondary voice coil and magnet system into the primary assembly. This merging approach allows the compensation mechanism to share structural elements with the drive system, reducing overall device complexity while maintaining effective vibration cancellation.
Solution Approach 2:
The secondary voice coil and magnet system are nested within the primary magnet system structure. The secondary components are positioned in the center opening of the primary magnet system, creating a compact nested arrangement that minimizes the overall footprint and reduces the bulkiness of the vibration compensation system.
2Object-affected harmful factors
If a distinct mass is moved in antiphase with the primary voice coil to compensate vibrations, then vibration compensation is achieved, but the device becomes bulky
Solution Approach 1:
The secondary voice coil and magnet system are nested within the primary magnet system structure. The secondary components are positioned in the center opening of the primary magnet system, creating a compact nested arrangement that minimizes the overall footprint and reduces the bulkiness of the vibration compensation system.
Solution Approach 2:
The patent utilizes the axial dimension by positioning the secondary components along the primary coil axis, specifically in the center opening. This dimensional arrangement allows the compensation mass to be positioned along the length of the actuator rather than requiring additional radial or lateral space, thereby reducing overall device volume.
3Object-affected harmful factors
If conventional vibration compensation is implemented, then some unwanted vibrations are reduced, but still some unwanted vibrations remain
Solution Approach 1:
The patent employs feedback control by sensing the position of the primary voice coil and using this information to adjust the secondary voice coil drive signal. This feedback mechanism ensures that the vibration compensation is dynamically adapted to the actual operating conditions, improving the effectiveness and reliability of vibration cancellation across varying frequencies and amplitudes.
Solution Approach 2:
The system dynamically adjusts parameters such as the phase shift and gain of the secondary voice coil signal based on the operating conditions. By changing these parameters in response to detected vibrations, the system optimizes the compensation effectiveness across different frequency ranges and maintains high reliability in vibration reduction.
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 configuration results in a more compact, less complex vibration compensation system that effectively reduces unwanted vibrations, achieving a total thickness of less than 10 mm and improved vibration compensation in electrodynamic actuators.
Implementation Method 1
the primary magnet system is designed to generate a primary magnetic flux transverse to the primary electrical conductor in the primary loop section
Implementation Method 2
the primary magnet system and the secondary magnet system are designed to generate a secondary magnetic flux transverse to the secondary electrical conductor in the secondary loop section
Implementation Method 3
a movable part of the secondary drive system, which comprises or is formed by the at least one secondary voice coil and/or the inner center magnet, is movably coupled to the primary magnet system
Data Source
AI summary
An electrodynamic actuator (1, 1a . . . 1k) is disclosed, which comprises a primary drive system (2a, 2b) with a primary voice coil (3, 3a . . . 3d) and a primary magnet system (4, 4a, 4b) and which comprises a secondary drive system (6) with a secondary voice coil (7) and a secondary magnet system (9). The secondary drive system (6) is arranged within the primary magnet system (4, 4a, 4b), and an inner center magnet (10) of the secondary magnet system (9) is arranged within the secondary voice coil (7). A movable part (33a . . . 33c) of the secondary drive system (6) comprises or is formed by the secondary voice coil (7) and/or the inner center magnet (10). Additionally, an electrodynamic transducer (23), an output device, a speaker (26) and a sound system (35) with such an electrodynamic actuator (1, 1a . . . 1k) are disclosed. The sound system (35) comprises an electronic sound signal circuit (36) for generation of a primary coil signal (SO1) fed to the primary voice coil (3, 3a . . . 3d) and of a phase shifted secondary coil signal (SO2) fed to the secondary voice coil (7).