Rotary Reciprocating Drive Actuator Thermal Management
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Solution Overview
Problem
The rotary reciprocating drive actuator of the movable coil type faces issues with heat generation affecting the mirror's surface state, bonding, shape, and amplitude, and has a complex configuration due to multiple magnets, making it difficult to increase input current and mirror size, and assembly is challenging due to wiring requirements.
Innovation Solution
A configuration with a magnet fixed to a shaft and a fixing body with magnetic poles and attraction members that generate specific magnetic forces to achieve reciprocating rotation, using electromagnetic interaction to drive the movable body with a simple and stable setup, allowing for high amplitude and reduced component complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a movable coil type rotary reciprocating drive actuator is used, then the mirror can be driven for optical scanning, but heat generation adversely affects the mirror surface state, bonding state, shape, and amplitude
Solution Approach 1:
The patent extracts the coil from the movable body and relocates it to the stationary core. This separation removes the heat-generating component from proximity to the mirror, eliminating thermal adverse effects while preserving the mirror's surface state, bonding, shape, and amplitude during operation.
2Stability of the object's composition
If four permanent magnets are disposed on the rotational shaft to position the switching portion of magnetic poles at the center of the core, then the magnet can be suitably stationary at the reciprocating rotation center position, but the amplitude of the movable body is reduced and the configuration becomes complicated
Solution Approach 1:
The patent inverts the conventional configuration by placing the magnet on the movable body (rotational shaft) and the coil on the stationary core, rather than the traditional movable coil type. This inversion simplifies the configuration to a single magnet while maintaining stable positioning at the reciprocating rotation center through the magnetic attraction force generated between the magnet and the core.
3Stability of the object's composition
If four permanent magnets are used on the movable body side, then the magnet can be positioned around a shaft portion, but a large number of components are used resulting in a complicated configuration and difficult assembly
Solution Approach 1:
The patent extracts the coil from the movable body and relocates it to the stationary core, reducing the movable body components to only the magnet and shaft. This simplification makes assembly easier while maintaining proper magnet positioning around the shaft portion through the magnetic interaction with the core.
4Power
If wiring to the coil needs to be drawn out to a fixing body side with respect to the mirror being the movable body, then the coil can be energized, but the assemblability is poor
Solution Approach 1:
The patent inverts the configuration by making the core with the coil stationary and the magnet movable. This allows the coil to be wired to the fixing body side naturally, improving assemblability while maintaining the ability to energize the coil for generating magnetic attraction force.
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 enables a stable and high-amplitude reciprocating rotation with a simple configuration, reducing heat-related issues and assembly complexity, while maintaining the mirror's performance and allowing for larger mirror sizes and increased input current.
Implementation Method 1
a magnetic flux passing through the plurality of magnetic poles is generated by energization of the plurality of coils, causing the reciprocating rotation of the movable body about an axis of the shaft portion with reference to the rotational center position by electromagnetic interaction between the magnetic flux and the magnet
Implementation Method 2
the first magnetic attraction member being configured to generate a first magnetic attraction force between the first magnetic attraction member and the magnet, the first magnetic attraction force defining a rotational center position of the reciprocating rotation of the movable body
Implementation Method 3
the second magnetic attraction member being configured to generate a second magnetic attraction force between the second magnetic attraction member and the magnet, the second magnetic attraction force canceling an axis-radial load acting by the first magnetic attraction force on the movable body
Data Source
AI summary
A rotary reciprocating drive actuator includes: a movable body including a magnet fixed to a shaft portion; a fixing body including a plurality of magnetic poles, a first magnetic attraction member, and a second magnetic attraction member that are disposed to face an outer circumference of the magnet;, the plurality of magnetic poles including a plurality of coils, the first magnetic attraction member being configured to generate a first magnetic attraction force, the second magnetic attraction member being configured to generate a second magnetic attraction force, in which a magnetic flux passing through the plurality of magnetic poles is generated by energization of the plurality of coils, causing the reciprocating rotation of the movable body about an axis of the shaft portion with reference to the rotational center position by electromagnetic interaction between the magnetic flux and the magnet.