Motor Current Control for Work Equipment Temperature Stability
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Solution Overview
Problem
Conventional work equipment systems face challenges in stabilizing operation temperature due to varying thermal energy generation, leading to reduced mechanical accuracy, increased warm-up time, and decreased efficiency and lifespan, especially when cooling devices are not used or when environmental temperatures are low.
Innovation Solution
A work equipment system and control method that includes a motor device, temperature sensor, and controller, which calculates and adjusts current to match motive power and thermal requirements, enabling stable temperature control by reducing motive power when necessary and utilizing a cooling device as needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a cooling device is disposed to control the temperature of work equipment, then the temperature stability is improved, but the device complexity and production cost increase
Solution Approach 1:
The patent combines the heating function and cooling control function into a single integrated system. The motor device serves dual purposes: generating motive power and providing heating during operation. The controller integrates both motive power control and temperature control functions, eliminating the need for separate heating and cooling devices.
Solution Approach 2:
The motor device serves itself by generating thermal energy during normal operation that can be utilized for heating the work equipment. The system uses the inherent thermal byproduct of motor operation to maintain temperature, eliminating the need for external heating devices.
2Device complexity
If the work equipment is designed without cooling device to reduce production cost and save working space, then the device complexity is reduced, but the temperature control capability deteriorates when environmental temperature is low
Solution Approach 1:
The motor device serves itself by generating thermal energy during normal operation that can be utilized for heating the work equipment. The system uses the inherent thermal byproduct of motor operation to maintain temperature, eliminating the need for external heating devices.
Solution Approach 2:
The controller periodically adjusts the motor operation to maintain temperature. When temperature drops below the threshold, the controller increases motor operation to generate more heat, and when temperature is sufficient, it reduces motor operation. This periodic adjustment enables temperature control without dedicated heating/cooling devices.
3Manufacturing precision
If the work equipment carries out warm-up operation initially, then the mechanical accuracy is improved, but the productivity decreases due to extended warm-up time
Solution Approach 1:
The patent converts the thermal byproduct of motor operation into a beneficial heating source. The thermal energy that would otherwise be wasted is now utilized to warm up the work equipment during normal operation, eliminating the need for a separate warm-up phase and reducing warm-up time.
Solution Approach 2:
The system maintains continuous useful action by utilizing thermal energy generation during normal motor operation to simultaneously warm up the equipment. This eliminates the need for a separate warm-up phase, allowing production to begin immediately while temperature requirements are met through continuous motor operation.
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 maintains mechanical accuracy, shortens warm-up time, and increases work efficiency and equipment lifespan by simultaneously managing motive power and temperature, even in low-temperature environments without a cooling device.
Implementation Method 1
the conversion efficiency between electric energy and kinetic energy in the electric motor is not 100%, the process of generating the motive power has heat loss that is in the form of the thermal energy
Implementation Method 2
a cooling device (e.g., water-cooling, oil-cooling or gas-cooling device) is disposed for cooling the work equipment system
Implementation Method 3
the motion of the mechanism elements used for transmission and guidance also induces the heat loss in the form of the thermal energy because of friction
Data Source
AI summary
The present disclosure provides a work equipment system and a control method therefor. The work equipment system includes a work equipment, a temperature sensor and a controller. The work equipment includes a motor device, and the motor device is configured to provide a motive power to a load device. The temperature sensor is configured to measure a motor temperature. The controller is configured to: calculate a first current based on a required motive power command and electrical parameters; calculate a temperature difference between the motor temperature and a preset temperature; calculate a thermal power based on the temperature difference and a thermal resistance; calculate a second current based on the thermal power and the motor resistance; and compare the second current to an effective value of the first current for determining whether the second current is smaller than the first current.