Magnetic Pendulum Frequency Control for Mechanical Clocks
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Solution Overview
Problem
Mechanical pendulum clocks face accuracy issues due to temperature and environmental fluctuations, making it difficult to maintain precise timekeeping, especially in large clocks, as their oscillation frequency is influenced by the length of the pendulum and gravitational acceleration, requiring complex adjustments.
Innovation Solution
A method and arrangement that magnetically influences the pendulum by generating a constant magnetic field, using a permanent magnet or magnetizable element, to adjust the oscillation frequency without disrupting the pendulum's natural behavior, by superimposing a magnetic field on the gravitational field, allowing for synchronization with a reference frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the pendulum length is adjusted to compensate for temperature effects, then the oscillation frequency accuracy is improved, but the adjustment process becomes time-consuming and complex
Solution Approach 1:
The patent replaces the traditional mechanical adjustment system (changing pendulum length through physical modification) with a magnetic field-based system. A permanent magnet is positioned near the pendulum bob, and by adjusting the magnet's position or strength, the oscillation frequency is modified through magnetic attraction forces acting on the pendulum mass, eliminating the need for mechanical length adjustments.
Solution Approach 2:
The patent changes the physical parameter used for frequency adjustment from pendulum length to magnetic field strength/position. By varying the magnetic field parameters (magnet position, magnet strength), the effective oscillation frequency is adjusted without altering the physical dimensions of the pendulum, providing a more convenient and reversible adjustment mechanism.
2Measurement precision
If electronic synchronization methods are used to correct pendulum oscillation, then timekeeping accuracy is improved, but the characteristic oscillation behavior of the pendulum is disturbed
Solution Approach 1:
The patent applies periodic magnetic impulses to the pendulum that are synchronized with its natural oscillation period. By delivering small magnetic kicks at the correct moments in the oscillation cycle, the pendulum's frequency is gradually adjusted to match the desired reference frequency while maintaining its natural harmonic motion characteristics, avoiding the need for continuous electronic intervention.
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 approach allows for precise adjustment of the pendulum's oscillation frequency to achieve accuracy of less than 1 second deviation from a reference time, enabling long-term accurate timekeeping without altering the pendulum's length or mechanics, suitable for both old and large mechanical clocks.
Implementation Method 1
a magnetic coil (8), in particular an ironless magnetic coil, arranged horizontally and centrally to the pendulum (1) and generating a magnetic field (b) in the region of the pendulum (1) or at least a partial region thereof, essentially parallel to the direction of the acceleration due to gravity
Data Source
Figure 1
AI summary
The invention relates to a method and an arrangement for magnetically influencing a pendulum (1) of a mechanical pendulum clock (2), wherein the pendulum (1) has an upper pivot point (3) and a lower end (4) which, due to the acceleration due to gravity (g), can oscillate in a plane at a first clock frequency on a circular path segment (6), wherein a magnetic field (b) constant for the duration of at least one pendulum oscillation is generated in the area of the pendulum (1) or at least a part thereof, which is substantially vertical, and a permanent magnet (7) is arranged on the pendulum (1) with a magnetic field orientation along the pendulum (1).A corresponding arrangement comprises at least one iron-free magnetic coil (8) arranged substantially horizontally and centrally to the pendulum (1), which can generate a vertical magnetic field (b) in the region of the pendulum (1) or at least a partial region thereof, and wherein a permanent magnet (7) is arranged on the pendulum (1) with a magnetic field orientation (NS) along the pendulum. The invention is particularly suitable for large clocks where adjusting the time and/or changing the pendulum length is very complex. By superimposing the Earth's constant gravitational field with an adjustable magnetic field, the oscillation frequency of the clock can be synchronized with a reference frequency, thereby significantly increasing the clock's accuracy.