Piezoelectric Drive Rotor with Composite Transmission Section
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Solution Overview
Problem
Existing piezoelectric drive devices face challenges in reducing the weight of the driven body while maintaining efficient force transfer, as lighter driven bodies tend to vibrate excessively and fail to effectively receive the drive force from the vibrating body.
Innovation Solution
A piezoelectric drive device with a rotor that includes a transmission section with distinct first and second portions, where the second portion has a higher Young's modulus and mass per unit volume than the first portion, and the vibrating part contacts the transmission section at a position overlapping the second portion, allowing for efficient drive force transmission while reducing rotor weight and suppressing vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the weight of the driven body (rotor) is reduced, then power consumption is reduced, but the driven body becomes easy to vibrate and drive force transfer efficiency deteriorates
Solution Approach 1:
The rotor employs a composite structure where different portions have different material properties: the first portion (outer peripheral part) uses a low-density material to reduce weight, while the second portion (inner part near output section) uses a high-Young's modulus material to maintain rigidity and ensure efficient drive force transfer. This local differentiation of material quality resolves the contradiction between weight reduction and vibration suppression.
Solution Approach 2:
The rotor is constructed as a composite body combining materials with different properties: a low-density material for the outer portion and a high-Young's modulus material for the inner portion. This composite structure enables simultaneous achievement of weight reduction and maintained rigidity for effective drive force transfer, directly addressing the technical contradiction.
2Weight of moving object
If the weight of the driven body is reduced, then power consumption is reduced, but vibration increases causing operational instability
Solution Approach 1:
By providing the second portion (inner part) with high-Young's modulus material, the rotor maintains sufficient rigidity to suppress vibrations during operation. This localized reinforcement of stiffness in the critical region near the output section ensures operational stability while the overall weight is reduced by the low-density material in the outer portion.
3Weight of moving object
If the driven body is made lighter, then power consumption decreases, but the ability to efficiently receive drive force deteriorates
Solution Approach 1:
The second portion, positioned at the inner part of the rotor near the output section, is made of material with high Young's modulus to ensure efficient reception and transmission of drive force. This localized high-stiffness region maintains force reception capability while the overall rotor weight is reduced by the low-density material in the outer first portion.
Solution Approach 2:
The composite material structure combines low-density material in the first portion with high-Young's modulus material in the second portion, enabling the rotor to be lightweight while maintaining the force reception capability through the stiff inner material that efficiently receives and transmits drive force from the piezoelectric element.
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 solution enables both weight reduction and efficient drive force transmission to the rotor, suppressing vibration and extending the device's operational stability and efficiency.
Implementation Method 1
a vibrating part which has a piezoelectric element, and rotates the rotor due to a deformation of the piezoelectric element
Data Source
AI summary
A piezoelectric drive device includes a rotor which has an output section for outputting a rotational force and a transmission section disposed on an outer periphery of the output section, and rotates around a rotational axis, and a vibrating part which has a piezoelectric element, and rotates the rotor due to a deformation of the piezoelectric element. The transmission section has a first portion and a second portion different from each other in position in a radial direction from the output section toward the transmission section, the first portion is coupled to the output section, the second portion is higher in Young's modulus than the first portion, the second portion is higher in mass per unit volume than the first portion, and the vibrating part makes contact with the transmission section at a position overlapping the second portion in a plan view from an axial direction of the rotational axis.