Arc-Shaped Thrust Measuring Device Using Hydrostatic Guidance
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Solution Overview
Problem
Existing methods struggle to precisely measure cogging and ripple in linear motors arranged in an arc shape, which affects control performance and accuracy.
Innovation Solution
A thrust measuring device comprising a movable unit and a stationary unit with hydrostatic pads and plates of matching arc shapes, coupled with a pressure sensor, force sensor, and actuator, allows precise measurement of cogging and ripple by moving the movable unit in synchronization with the linear motor's magnetic field.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a contact-type guide mechanism (bearing mechanism) is used for measuring thrust pulsation, then the measurement can be performed with a force sensor, but frictional forces interfere with the measurement accuracy of cogging and ripple
Solution Approach 1:
The patent replaces the contact-type mechanical guide mechanism (bearing) with a non-contact guide mechanism that uses a magnetic field to guide the movement of the linear motor. This substitution eliminates frictional forces between moving parts, allowing accurate measurement of thrust pulsation (cogging and ripple) without interference from mechanical friction. The magnetic guide creates a contactless bearing system where the linear motor moves along guide rails under magnetic field control, eliminating the need for physical contact and associated friction.
2Adaptability or versatility
If the linear motor is arranged in an arc shape, then it can achieve specific application requirements, but existing linear motor measurement methods cannot precisely measure cogging and ripple
Solution Approach 1:
The patent adapts the measurement system to dynamically match the arc-shaped configuration of the linear motor. The non-contact guide mechanism is designed to accommodate the curved path, allowing the linear motor to move along the arc while maintaining precise measurement capabilities. The system adjusts its guidance and measurement approach to follow the curved trajectory, enabling accurate cogging and ripple measurement in arc-shaped arrangements that were previously unmeasurable with conventional linear measurement methods.
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
Enables precise measurement of cogging and ripple in linear motors with reduced frictional errors, improving control performance and accuracy by minimizing the influence of frictional forces during measurement.
Implementation Method 1
a first hydrostatic plate and/or a first hydrostatic pad caused to move in a manner matched to a shape of the stationary-side magnets or the stationary-side coils
Implementation Method 2
a pressure sensor or a force sensor for measuring thrust of the linear motor
Data Source
AI summary
Provided herein are: a movable part that is provided with coils placed correspondingly to magnets arranged in an arc shape, a pressure sensor, vertical-side hydrostatic pads, and a lateral-side hydrostatic plate and lateral-side hydrostatic pads caused to move in a manner matched to the shape of the magnets; and a stationary part that is provided with a base on which the magnets and vertical-side hydrostatic plates being opposite to the vertical-side hydrostatic pads are placed, a wall on which a lateral-side hydrostatic pad being opposite to the lateral-side hydrostatic plate is placed, a wall on which a lateral-side hydrostatic plate being opposite to the lateral-side hydrostatic pads is placed, and a wall to which an actuator coupled to the pressure sensor through a ball joint.