Wireless Rotating Force-Torque Measurement for Chip-Removing Machining
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Solution Overview
Problem
Existing systems for measuring force and torque during chip-removing machining require a stator unit and connecting cable, which are difficult to position and install, leading to increased setup time and cost, and lack the accuracy and uninterrupted operation needed for high-speed machining.
Innovation Solution
A wireless, cable-free system that transmits measured value data directly from a rotating device to a stationary evaluation unit, using reduced power consumption and advanced data transmission methods to achieve high accuracy and extended operation time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a stator unit and connecting cable are used to transmit measured value data, then the system can provide continuous power and data transmission, but the setup time increases and the installation becomes more complex
Solution Approach 1:
The patent removes the stator unit and connecting cable from the system, extracting only the essential function of wireless power and data transmission. The rotor unit now contains both power consumption and data transmission functions, eliminating the need for external power supply infrastructure and complex cable routing, thereby reducing setup time while maintaining operational reliability
Solution Approach 2:
The patent replaces the mechanical cable connection system with a wireless transmission system. Measured value data and power are transmitted wirelessly from the rotor unit to external receivers, eliminating the need for physical cable routing and mechanical connections, thus reducing installation complexity and setup time
2Use of energy by moving object
If a stator unit is positioned close to the rotor unit through an air gap, then wireless power transmission is achieved, but the available space is insufficient for small tools and small tool diameters
Solution Approach 1:
The stator unit is completely removed from the system, extracting the wireless power transmission function into the rotor unit itself. This eliminates the space requirement for positioning a stator unit near the rotor, making the system adaptable to small tools and limited spaces while maintaining wireless power transmission capability
Solution Approach 2:
The rotor unit is designed to perform multiple functions: measuring force and torque, storing energy, and transmitting power and data wirelessly. This multi-functionality eliminates the need for separate stator units and external power supplies, making the system universally applicable to various tool sizes and installation spaces
3Duration of action of moving object
If the transmission power is increased to maintain uninterrupted operation, then the operation time can be extended, but the energy consumption increases
Solution Approach 1:
The patent employs periodic energy transmission in pulsed intervals rather than continuous high-power transmission. The rotor unit transmits power and data in periodic bursts synchronized with the rotation cycle, reducing average energy consumption while maintaining uninterrupted operation through energy storage in the rotor unit
Solution Approach 2:
The patent changes the transmission power parameter dynamically based on operational requirements. The rotor unit adjusts transmission power levels and utilizes energy storage to maintain operation during low-power intervals, optimizing the balance between operation duration and energy 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
The system provides high-accuracy force and torque measurements with reduced energy consumption, enabling uninterrupted operation for at least 8 hours and improved monitoring of tool condition in real-time, without the need for a stator unit or connecting cable.
Implementation Method 1
The type 9170A 4-component dynamometer uses piezoelectric transducers which generate measured values in the form of electric polarization charges under the effect of the force and torque component type
Implementation Method 2
said control unit transmits the measured values in the form of measured value data directly to said evaluation unit in a wireless manner
Data Source
AI summary
A system for chip-removing machining of a workpiece and for measuring and evaluating force and torque during the chip-removing machining of the workpiece includes a machine tool with a tool for chip-removing machining of the workpiece; a device for measuring force and torque that includes a plurality of piezoelectric transducers generating polarization charges being communicated through a respective measuring channel; and a stationary evaluation unit for evaluating measured value data of the device. The device includes a measuring unit installed in the machine tool and rotates with the tool about an axis of rotation during chip-removing machining. The device includes a control unit that transmits measured values as measured value data in a wireless manner directly to the evaluation unit with a transmission power in the range of 0.1 mW to 10 mW.