Electromagnetic Piston Drive With End-Position Braking
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Solution Overview
Problem
Existing portable electric tools face issues such as reduced service life, weak output, and high weight due to the use of flywheel or geared motor systems.
Innovation Solution
A portable electric device with a movable piston using a power supply to expel the piston via a fixed coil and braking mechanisms, including isotropic soft magnetic composite materials like Somaloy, and flexible or magnetic braking mechanisms to control piston movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If a flywheel or geared motor is used to store mechanical energy, then the device can operate portably, but the service life is reduced and the weight increases
Solution Approach 1:
The patent replaces the traditional mechanical energy storage system (flywheel or geared motor with spring) with an electromagnetic system consisting of coils and a movable piston. The electromagnetic field generated by the coils propels the piston without mechanical gears or rotating masses, thereby extending service life by eliminating mechanical wear and reducing device weight by removing heavy mechanical components.
Solution Approach 2:
The patent changes the fundamental operating parameter from mechanical energy storage to electromagnetic energy conversion. By using coils to generate electromagnetic forces that move the piston directly, the system achieves portable operation with improved service life and reduced weight compared to mechanical systems.
2Power
If a flywheel or geared motor is used to store mechanical energy, then the device can drive movable parts, but the output is weak
Solution Approach 1:
The electromagnetic piston propulsion system replaces mechanical energy storage, delivering stronger output forces through direct electromagnetic actuation while maintaining extended service life by eliminating mechanical wear from gears and flywheels.
3Weight of moving object
If a piston is expelled by a coil, then the device achieves compact design and reduced weight, but the piston needs braking mechanism adding complexity
Solution Approach 1:
The coil serves multiple functions: it acts as both the expulsion mechanism to propel the piston forward and, when appropriately configured, as a braking mechanism to decelerate and stop the piston. This multi-functionality reduces device complexity by eliminating the need for separate braking components while maintaining the benefits of electromagnetic actuation.
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
Enhances service life, output, and reduces weight by providing controlled piston movement and compact design.
Implementation Method 1
a power supply intended to supply power to a first fixed coil, the first fixed coil being positioned facing an expulsion mechanism for expelling the piston
Implementation Method 2
at least one braking mechanism for braking the piston that are configured to brake the piston when the piston is in the end position or approaching the end position
Data Source
AI summary
A portable electric device comprising a cylinder in which at least one movable piston slides between a start position and an end position, said piston comprising a mechanism configured to come into contact with an element to be operated once the piston is in the end position or is between the start position and the end position. More specifically, the portable electric device comprises: a power supply intended to supply power to a first fixed coil, the first fixed coil being positioned facing an expulsion mechanism for expelling the piston when the piston is in the start position, the expulsion mechanism being secured to a first face of the movable piston; and at least one braking mechanism for braking the piston that are configured to brake the piston when the piston is in the end position or approaching the end position.