Bearing Temperature Estimation Without Sensors
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Solution Overview
Problem
Existing methods for estimating the temperature of a bearing supporting a spindle in a machine tool are costly due to the use of temperature sensors.
Innovation Solution
A temperature estimation device and method that calculate the bearing temperature using a rotational speed acquiring unit, temperature rise table, and temperature fall table, eliminating the need for a temperature sensor by associating rotational speed with temperature changes over fixed time intervals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a temperature sensor is installed to measure bearing temperature, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces the physical temperature sensor measurement system with a computational model that calculates bearing temperature based on rotational speed data. The bearing temperature calculating unit uses stored temperature rise and temperature fall tables to compute temperature without physical contact or additional sensing hardware, thereby eliminating device complexity while maintaining measurement capability.
Solution Approach 2:
The patent introduces rotational speed as an intermediary parameter to indirectly determine bearing temperature. Instead of directly measuring temperature with a sensor, the system measures rotational speed and uses it as a mediator to calculate temperature through predefined relationships in the temperature rise and fall tables, achieving temperature estimation without direct thermal measurement.
2Measurement precision
If a temperature sensor is installed to measure bearing temperature, then measurement precision is improved, but cost increases
Solution Approach 1:
The patent replaces expensive temperature sensing hardware with a computational calculation system. The bearing temperature calculating unit processes readily available rotational speed data through algorithmic computation using stored tables, eliminating the need for costly temperature sensors while maintaining the ability to obtain accurate bearing temperature information.
Solution Approach 2:
The patent creates a virtual model of temperature behavior through temperature rise and temperature fall tables that store pre-established relationships between rotational speed and temperature changes. This computational copy of the thermal system allows temperature estimation without physical temperature sensors, reducing manufacturing costs while preserving measurement accuracy.
3Device complexity
If temperature is calculated using rotational speed and heat dissipation data, then device complexity is reduced, but measurement precision may worsen
Solution Approach 1:
The patent continuously updates bearing temperature calculations by repeatedly applying the temperature calculation process using current rotational speed data and the stored temperature rise and fall tables. This continuous computational action ensures that temperature estimation remains current and accurate throughout operation, compensating for the absence of direct physical measurement through persistent algorithmic refinement.
Solution Approach 2:
The patent incorporates feedback mechanisms where the calculated bearing temperature and rotational speed data are continuously fed back into the calculation process. The bearing temperature calculating unit uses this feedback to refine temperature estimates by considering both temperature rise from rotation and temperature fall from heat dissipation, improving measurement precision through iterative computational refinement.
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
Accurately estimates the bearing temperature at a low cost without using a temperature sensor, considering both temperature rise due to rotation and fall due to heat dissipation.
Implementation Method 1
a temperature rise of the bearing due to rotation of the spindle
Implementation Method 2
a temperature fall of the bearing due to heat dissipation
Data Source
AI summary
In a temperature estimation method, a rotational speed of a spindle is acquired. Moreover, a temperature rise table and a temperature fall table are used to calculate a temperature of a bearing from the rotational speed of the spindle every time a fixed time elapses. The temperature rise table stores in an associated manner the rotational speed of the spindle and a temperature rise of the bearing due to rotation of the spindle in a predetermined fixed time. The temperature fall table stores in an associated manner the temperature of the bearing and a temperature fall of the bearing due to heat dissipation in the fixed time.