Electrostatic Tension-Band Clutch for Low-Power Rotational Locking
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Solution Overview
Problem
Conventional clutches in mechanical systems are often too large, massive, and consume excessive power when in a holding state.
Innovation Solution
An electrostatic clutch utilizing a conductive shaft, a conductive tension band, a dielectric material, and a load attachment, which operates in an engaged mode with electrostatic attraction to lock components in unison and a disengaged mode to allow free rotation, utilizing the Johnsen-Rahbek effect and/or Capstan effect to provide holding power without additional energy input.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional clutches are used to provide rotational locking, then the clutch can reliably lock the shaft and load attachment, but the clutch becomes too large and massive
Solution Approach 1:
The patent replaces conventional mechanical clutch mechanisms with an electrostatic field-based system. Conductive layers on the shaft and tension band, separated by a dielectric material, create electrostatic forces that enable rotational locking without traditional mechanical components, thereby reducing mass while maintaining reliability
Solution Approach 2:
The invention changes the physical state and interaction parameters by using electrostatic fields instead of mechanical contact. The conductive layers and dielectric material enable voltage-controlled electrostatic attraction, transforming the locking mechanism from mechanical to electrical field-based operation
2Reliability
If conventional clutches are used to provide rotational locking, then the clutch can securely hold the load attachment, but the clutch consumes too much power when in a holding state
Solution Approach 1:
The electrostatic clutch system maintains holding state stability through the inherent properties of the electrostatic field and dielectric material. Once voltage is applied, the system self-maintains the locked state through electrostatic attraction between conductive layers, eliminating the need for continuous power consumption typical of conventional clutch holding mechanisms
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
The electrostatic clutch enables smaller, lighter, and more power-efficient mechanical systems by providing rotational locking and unlocking without additional energy consumption.
Implementation Method 1
a dielectric material disposed between the first layer and the second layer; and a load attachment rotatably coupled to the shaft, wherein the electrostatic clutch is configured to perform functions comprising: operating in an engaged mode wherein a voltage applied between the first layer and the second layer causes the tension band to clasp the shaft
Implementation Method 2
utilizing the Johnsen-Rahbek effect and/or Capstan effect to provide holding power without additional energy input
Data Source
AI summary
An electrostatic clutch includes a shaft having an electrically conductive first layer. The clutch also includes a hold attachment rotatably coupled to the shaft and a tension band having an electrically conductive second layer. The tension band is wrapped around the shaft such that a first end of the tension band is coupled to the hold attachment. The clutch includes a dielectric material disposed between the first layer and the second layer and a load attachment rotatably coupled to the shaft. The clutch is configured for an engaged mode where a voltage applied between the first layer and the second layer causes the tension band to clasp the shaft and the load attachment and the hold attachment to be rotationally locked to the shaft, and for a disengaged mode where the voltage is absent and the shaft can rotate freely with respect to the load attachment and the hold attachment.