Integrated Electric Motor Drive for Vibration Plate
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Solution Overview
Problem
Existing soil compacting devices face issues with high load on belt drives due to changing pulley positions and parallelism, leading to increased wear and maintenance, as well as noise and emissions from internal combustion engines, limiting their application in sensitive environments.
Innovation Solution
A soil compacting device with an integrated electric motor within the imbalance exciter on the lower mass, eliminating the need for a belt drive and allowing for a compact, efficient design that reduces noise and emissions by using an electric motor directly integrated into the imbalance exciter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If an internal combustion engine with belt drive is used to power the vibratory exciter, then the device can achieve the required power output, but the belt drive experiences high load and increased wear due to changing pulley positions and parallelism
Solution Approach 1:
The patent replaces the belt drive mechanical transmission system with a direct-drive configuration where the electric motor is integrated into the vibratory exciter. This eliminates the belt, pulleys, and associated mechanical transmission components, directly resolving the reliability issues caused by belt wear and slippage while maintaining the required power output for soil compaction.
Solution Approach 2:
The patent merges the electric motor and vibratory exciter into a single integrated unit, with the motor mounted directly on the lower mass and the exciter shaft connected directly to the motor shaft. This consolidation eliminates the need for separate power transmission mechanisms and reduces the number of moving parts, thereby improving reliability while preserving power delivery.
2Power
If an internal combustion engine is used as the drive motor, then sufficient power can be delivered, but noise and emissions are generated that limit application in sensitive environments
Solution Approach 1:
The patent substitutes the internal combustion engine with an electric motor, replacing a thermal-mechanical system with an electrical system. This substitution eliminates exhaust emissions and significantly reduces noise levels, allowing the soil compaction device to be used in environmentally sensitive areas while maintaining adequate power delivery through direct electric drive.
3Power
If a belt drive system is used to transmit power from the engine to the exciter, then power can be transmitted, but the changing distance and parallelism between pulleys increase stress on the drive belt
Solution Approach 1:
The patent extracts and removes the entire belt drive system including the belt, pulleys, and associated mounting hardware from the device. By eliminating this complex power transmission subsystem, the design achieves simpler construction and reduced maintenance requirements while the electric motor provides direct power transmission to the exciter shaft.
Solution Approach 2:
The patent combines the power source (electric motor) and the driven component (vibratory exciter) into a directly coupled configuration, eliminating the intermediate belt drive mechanism. This merging of functions reduces the number of components and simplifies the overall drive system architecture.
4Power
If an unbalance exciter with separate drive motor and belt drive is used, then power can be transmitted to the unbalanced masses, but the belt stretching causes slippage and speed fluctuations
Solution Approach 1:
The patent replaces the belt-driven power transmission system with a direct electric motor drive, where the motor shaft is directly connected to the exciter shaft. This substitution eliminates belt stretching and slippage, ensuring consistent rotational speed and stable operation of the unbalanced masses throughout the compaction process.
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 solution stabilizes the running behavior of the unbalance exciter, reduces maintenance needs, and allows for quieter operation, enabling use in closed spaces and reducing component count, thus enhancing operational efficiency and applicability.
Implementation Method 1
An electric motor for driving the unbalance exciter is provided on the lower mass, the electric motor being integrated into the unbalance exciter
Implementation Method 2
at least one unbalance exciter belonging to the lower mass for applying an unbalance force to the soil contact plate
Implementation Method 3
a vibration exciter is arranged on the soil contact plate and is driven by an electric motor
Data Source
Figure 1
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AI summary
A soil compaction device is described, comprising an upper mass (1), a lower mass (2) movable relative to the upper mass (1), a soil contact plate (9) for soil compaction, a vibration decoupling device (3) acting between the upper mass (1) and the lower mass (2), at least one unbalance exciter (10) belonging to the lower mass (2) for applying an unbalance force to the soil contact plate (9), and an electric motor (27) provided on the lower mass (2) for driving the unbalance exciter (10). The electric motor (27) is integrated into the unbalance exciter (10).