Galvanoscanner Permanent Magnet Segmentation for Power Reduction
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Solution Overview
Problem
Existing galvanoscanners face increased power consumption due to high response frequency, leading to temperature rise and demagnetization of permanent magnets, which affects drilling speed and accuracy in laser processing machines.
Innovation Solution
The galvanoscanner design includes permanent magnets parted into multiple poles by parting lines and grooves formed in the direction of the rotation shaft to straddle adjacent magnetic poles, improving the torque constant to moment of inertia ratio, reducing the current required for driving and thus minimizing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the response frequency of the galvanoscanner is increased to increase drilling speed, then the productivity is improved, but the power consumption increases due to increased current flowing in the coil
Solution Approach 1:
The permanent magnet is divided into multiple segments along the circumferential direction, with insulating layers between adjacent segments. This segmentation interrupts eddy current paths, reducing eddy current losses and improving the torque constant to moment of inertia ratio, thereby reducing power consumption while maintaining high response frequency capability
Solution Approach 2:
The invention changes the physical structure of the permanent magnet by introducing grooves and insulating layers, which modifies the magnetic field distribution and reduces eddy current effects. This parameter change improves the torque constant to moment of inertia ratio, enabling high-speed operation with lower power consumption
2Speed
If the current flowing in the coil is increased to increase response speed, then the speed is improved, but the temperature of the permanent magnet increases due to Joule heat
Solution Approach 1:
The permanent magnet is segmented into multiple parts with insulating layers between them, which interrupts eddy current paths. This reduces the temperature rise caused by eddy currents when high current flows through the coil, allowing faster response speeds without excessive heating
Solution Approach 2:
The invention converts the harmful eddy current effect into a beneficial structure by intentionally introducing insulating layers and grooves. These features that would normally be considered modifications to reduce performance actually improve the situation by reducing eddy current losses and their associated heating effects
3Speed
If the temperature of the permanent magnet increases due to eddy current, then the power consumption increases due to demagnetization, but the response frequency increases
Solution Approach 1:
By segmenting the permanent magnet with insulating layers, eddy current paths are interrupted, reducing temperature rise. This maintains magnetic strength at higher response frequencies, preventing the increase in power consumption that would otherwise result from demagnetization
Solution Approach 2:
The structural parameters of the permanent magnet are changed by introducing grooves and insulating layers, which fundamentally alters the eddy current behavior. This parameter change reduces the temperature-dependent demagnetization effect, allowing high response frequency operation without the penalty of increased driving power consumption
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 effectively reduces power consumption by minimizing eddy current losses and maintaining torque constant, enhancing the efficiency and accuracy of the galvanoscanner's operation.
Implementation Method 1
a rotor including a shaft as a rotational center, and permanent magnets disposed around the shaft and polarized into poles in a circumferential direction of the shaft; and a stator disposed in the outside of the rotor through a clearance and including coils, a yoke, and an outer casing so that the rotor swings in a predetermined angle range
Implementation Method 2
the permanent magnets are parted into at least two parts per pole by parting lines... radial grooves opened toward the stator and having a depth not smaller than a skin depth represented by a function of the volume resistivity and permeability of the permanent magnets and the fundamental frequency of the current flowing in the coils are formed in the permanent magnets
Data Source
AI summary
A galvanoscanner including: a rotor including a shaft as a rotational center, and permanent magnets disposed around the shaft and polarized to a plurality of poles in a circumferential direction of the shaft; and a stator disposed in the outside of the rotor through a clearance and including coils, a yoke, and an outer casing so that the rotor swings in a predetermined angle range; wherein: the permanent magnets are provided with grooves which are formed in a direction of the rotation shaft so as to straddle circumferentially adjacent magnetic poles of the permanent magnets; and the permanent magnets are parted into at least two parts per pole by parting lines. Thus, the ratio of the torque constant to the moment of inertia can be improved so that the current required for driving can be reduced and reduction of power consumption at driving time can be attained.