Inertial Drive Actuator Without Vibration Substrate
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Solution Overview
Problem
Conventional inertial drive actuators require a vibration substrate and complex wiring, limiting their size reduction and efficiency due to frictional forces and heat management issues.
Innovation Solution
The design incorporates a coil and a movable body made of magnetic material, with a piezoelectric displacement generator that alters the magnetic flux direction to change frictional forces, eliminating the need for a vibration substrate and simplifying wiring, while using additional components like core materials and permanent magnets to enhance magnetic flux density and heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a vibration substrate is used to enable movable body displacement, then the actuator can achieve linear motion, but the device size increases and structural complexity increases
Solution Approach 1:
The invention extracts and eliminates the vibration substrate from the actuator structure. Instead of using a separate vibration substrate to enable linear motion, the patent uses a coil assembly that directly generates electromagnetic force to drive the movable body, thereby removing the complex vibration substrate structure while maintaining the displacement capability
Solution Approach 2:
The invention merges the functions of the vibration substrate and the driving mechanism into a single coil assembly. The coil assembly simultaneously provides both the electromagnetic driving force and the structural support previously separated into different components, simplifying the overall device structure
2Force
If magnetic materials are used for the movable body and adsorbing portion, then magnetic adsorptive force is generated for close contact, but frictional force increases between the movable body and vibration substrate
Solution Approach 1:
The invention converts the harmful frictional force into a beneficial controlled interaction. By using electromagnetic force to control the contact between the movable body and coil assembly, the friction that would normally be harmful is now utilized as a controlled mechanism for precise positioning and force transmission, while the harmful aspects are minimized through optimized magnetic field control
3Ease of operation
If complex wiring is used to control the actuator components, then precise control is achieved, but the device complexity and size increase
Solution Approach 1:
The coil assembly serves multiple functions simultaneously: it generates electromagnetic force for driving the movable body, provides structural support, and acts as part of the control mechanism. This multi-functionality eliminates the need for separate complex wiring systems, as the same component performs multiple roles that would otherwise require additional control elements
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 enables a compact inertial drive actuator with improved rigidity, reduced friction, efficient heat management, and increased flexibility in stroke length, allowing for efficient movement without a vibration substrate and simplified wiring.
Implementation Method 1
a piezoelectric element (displacement generator) 103 which displaces the coil 102 in a direction different from the direction in which, the magnetic flux is generated
Implementation Method 2
a coil 102, a movable body 101 which is disposed in a direction in which a magnetic flux of the coil 102 is generated
Implementation Method 3
When an electric current is applied to a coil, a magnetic field is generated. The magnetic field that is generated also generates a magnetic field in the adsorbing portion. By the magnetic field generated in the adsorbing portion, a magnetic adsorptive force is generated
Implementation Method 4
the movable body and the vibration substrate make a close contact, and a frictional force is generated between the movable body and the vibration substrate
Data Source
AI summary
The task of the present invention is to provide an inertial drive actuator having a small-size arrangement, without using a vibration substrate. The inertial drive actuator includes a coil, a movable body which is disposed in a direction in which, a magnetic flux of the coil is generated, and which is formed of a magnetic material having a surface facing the coil, and a displacement generator (piezoelectric element) which displaces the coil in a direction different from the direction in which the magnetic flux is generated. Moreover, the movable body is displaced relatively with respect to the displacement generator (piezoelectric element), along a direction of displacement of the displacement generator (piezoelectric element).