Interference-suppressed linear drive
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Solution Overview
Problem
Current linear drives have complex and time-consuming assembly processes due to separate circuit boards and wiring within a confined motor housing, leading to susceptibility to assembly errors and increased scrap rates.
Innovation Solution
The rear shaft bearing is mounted in the motor housing, and the front shaft bearing is located in the gearbox housing, with interference suppression components integrated onto a single board within the gearbox housing, simplifying installation and reducing wiring complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a linear motor is used to drive the scanning mirror, then precise control and high acceleration are achieved, but interference vibrations are generated that degrade scanning precision
Solution Approach 1:
A vibration isolation unit is introduced as an intermediary component between the linear motor and the scanning mirror assembly. This mediator absorbs and attenuates the high-frequency vibrations generated by the linear motor, preventing them from being transmitted to the scanning mirror and thereby maintaining scanning precision while allowing the use of high-performance linear motors
Solution Approach 2:
The vibration isolation unit converts the harmful high-frequency vibrations into attenuated mechanical energy that is dissipated through damping materials. By transforming the harmful vibrational energy into heat through viscoelastic damping, the system eliminates the negative effects while maintaining the beneficial high acceleration and precision control capabilities of the linear motor
2Object-affected harmful factors
If conventional vibration isolation methods are used, then some vibration reduction is achieved, but high-frequency vibrations from linear motors are not sufficiently suppressed
Solution Approach 1:
The vibration isolation unit employs viscoelastic damping materials with specifically selected loss factors and stiffness characteristics optimized for high-frequency vibration suppression. By changing the material parameters (loss factor, shear modulus) and structural parameters (precompression force, contact pressure) of the damping elements, the system achieves superior attenuation of high-frequency vibrations compared to conventional isolation methods, thereby maintaining scanning precision
3Productivity
If the scanning mirror rotates at high speed, then productivity is improved, but vibration and interference increase
Solution Approach 1:
The vibration isolation function is segmented into multiple independent damping elements (first and second vibration isolation units with separate damping members) that collectively suppress vibrations across different frequency ranges. This segmentation allows each damping element to be optimized for specific frequency bands, enabling effective vibration control at high scanning speeds where broad-spectrum vibration suppression is required
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 design facilitates faster, simpler, and less error-prone assembly by utilizing a single interference suppression board in the gearbox housing, providing more space for mounting and wiring, thus reducing assembly errors and scrap rates.
Implementation Method 1
a first damping member positioned between the linear motor and the first support, and a second damping member positioned between the linear motor and the second support
Implementation Method 2
first and second damping members suppress vibration
Data Source
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AI summary
The invention relates to a linear drive having: a gear casing 2; an interference-suppressed electric motor 24, which is connected to the gear casing and is accommodated in a motor casing 4 and, via a rotor accommodated in the motor casing 4, drives a shaft 10 which is mounted in a rear shaft bearing 44 at a rear shaft end and is mounted at a front shaft end; and a commutator (32) for transferring current to the rotor, electrical and/or electronic components for interference suppression of the electric motor 2. According to the invention, to simplify assembly and to reduce the susceptibility of the linear drive to faults, the rear shaft bearing 44 is mounted in the motor casing 4, the front shaft bearing 12 is mounted in the gear casing 2, 40, and the electrical and/or electronic components necessary for interference suppression of the electric motor 24 are arranged on an interference suppression circuit board 26 which is arranged between the front shaft bearing 12 and the commutator 32.