Ultrasonic Motor Torque Efficiency via Inverted Rotor Design
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Solution Overview
Problem
Conventional traveling wave type hollowed ultrasonic motors have a complex structure and reduced torque efficiency due to the need for fixing parts and connecting elements, which compromises the transmission of rotational torque from the vibrating element to the contacting element.
Innovation Solution
The design includes a movable member with projections that contact a fixed member, utilizing an electric field-converting element layer to generate a traveling wave, allowing the movable member to move relative to the fixed member, thereby simplifying the structure and enhancing torque efficiency by eliminating the need for additional connecting parts and reducing rotational torque loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the conventional traveling wave type hollowed ultrasonic motor uses a fixed vibrating element with fixing parts and a rotatable contacting element with compressing parts, then the motor can operate, but the structure becomes complicated
Solution Approach 1:
The patent inverts the conventional configuration by making the vibrating element rotatable and the contacting element fixed. This reversal eliminates the need for fixing parts on the vibrating element and compressing parts on the contacting element, significantly simplifying the overall structure while maintaining motor operation reliability
Solution Approach 2:
The patent removes unnecessary components (fixing parts and compressing parts) from the conventional design. By extracting these redundant elements through the inverted configuration, the motor achieves a simpler structure without compromising its operational reliability
2Stability of the object's composition
If the conventional ultrasonic motor uses fixing parts to secure the vibrating element, then the vibrating element is stable, but torque efficiency is reduced due to torque loss in the fixing and connecting parts
Solution Approach 1:
By inverting which element is fixed and which is rotatable, the patent eliminates torque loss occurring in the fixing parts and connecting elements of conventional designs. The rotatable vibrating element directly generates torque without loss, while the fixed contacting element provides stable contact, thus improving torque efficiency while maintaining stability
Solution Approach 2:
The patent converts the potential harm of torque loss into benefit by reconfiguring the system so that the elements previously causing torque loss (fixing parts and connecting elements) are eliminated. The inversion transforms the design to where torque is generated directly without loss, turning the conventional weakness into a strength
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 achieves high torque efficiency while simplifying the motor structure, preventing torque loss and eliminating the need for complex connecting units, resulting in a more efficient and compact ultrasonic motor.
Implementation Method 1
the vibrating element is provided with an electric field-converting element layer, which generates minute deformations or displacements due to a piezoelectric effect when it is applied with a voltage having a high frequency
Data Source
AI summary
An ultrasonic motor includes a fixed member including a surface, a movable member positioned to face the surface of the fixed member, and an actuator to cause at least a portion of the movable member to contact the surface of the fixed member and cause the movable member to move relative to the fixed member.