Machine Tool Motor Inertia Tuning to Eliminate Slip Clutches
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Solution Overview
Problem
Existing machine tools require mechanical slip clutches to limit torque peaks during tool jamming, which are expensive, require frequent maintenance, and compromise productivity and user safety.
Innovation Solution
The machine tool operates within a specific speed range of 2,000 to 30,000 rpm and inertia range of 20 × 10⁻⁶ to 750 × 10⁻⁶ kg·m² to limit maximum torque below a defined upper limit, eliminating the need for a mechanical slip clutch.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mechanical slip clutch is used to limit torque peaks during tool jamming, then user safety is improved, but device complexity and maintenance requirements increase
Solution Approach 1:
The patent removes the mechanical slip clutch from the system entirely. Instead of adding a safety component, the solution extracts the problematic mechanical element and replaces it with motor parameter control (speed and inertia selection) that inherently limits torque peaks during jamming, thereby improving safety while reducing device complexity
Solution Approach 2:
The patent replaces the mechanical slip clutch with a mechatronic solution based on motor control parameters. By selecting specific motor speed ranges (2,000-30,000 rpm) and inertia values (20-750 × 10⁻⁶ kg·m²), the system achieves torque limitation without mechanical friction elements, substituting mechanical safety devices with controlled motor characteristics
2Reliability
If a mechanical slip clutch is installed to protect against torque peaks, then user safety is improved, but productivity decreases due to frequent maintenance and high release speeds
Solution Approach 1:
By removing the mechanical slip clutch entirely and using motor parameter control to limit torque peaks, the patent eliminates the source of frequent maintenance and high release speeds. This extraction of the problematic component directly improves productivity by extending service intervals while maintaining user safety through controlled motor characteristics
3Reliability
If robust mechanical components are used to withstand torque peaks, then reliability is improved, but device complexity and weight increase
Solution Approach 1:
The patent replaces robust mechanical components designed to withstand torque peaks with a mechatronic control approach. By selecting motor parameters (speed: 2,000-30,000 rpm, inertia: 20-750 × 10⁻⁶ kg·m²) that inherently limit torque peaks during jamming, the system achieves the same reliability without the weight penalty of over-engineered mechanical parts
Solution Approach 2:
The patent changes the operating parameters of the motor (speed and inertia) to prevent excessive torque peaks in the first place. By operating within specific parameter ranges, the system avoids the need for heavy-duty mechanical components, thereby reducing weight while maintaining reliability against torque peaks
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 approach allows for a safer, more productive, and low-maintenance machine tool with extended service intervals, reducing user discomfort and injury risks from torque peaks.
Implementation Method 1
the inertia of the motor is in the range of 20 × 10−6 to 750 × 10−6 kg·m2
Data Source
Figure 1I~1III
Figure 2
AI summary
The invention relates to a machine tool having a tool and a motor, wherein the motor of the machine tool is operated in a speed range of from 2,000 to 30,000 rpm and wherein an inertia of the motor is in a range of from 20.10-6 to 750.10-6 kg.m2. In a second aspect, the invention relates to a method for operating this machine tool. By selecting and specifying a set of parameters which describe properties of the motor of the machine tool, the machine tool can be designed and operated such that a mechanical slip clutch can be dispensed with. The motor parameters "speed" and "inertia" are selected in particular such that a maximum torque in a gear mechanism of the machine tool is always below a predetermined upper limit. In addition, the invention makes it possible to work particularly productively with the machine tool, with tests having shown that the service intervals can advantageously be extended by omitting the mechanical slip clutch.