Generator Motor Magnet Work Machine Battery Elimination
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Solution Overview
Problem
Existing magnet work machines require batteries for power supply and regeneration, leading to complex device configurations, increased costs, and complicated control systems for maintaining battery charging rates and temperature.
Innovation Solution
A magnet work machine that uses a generator motor as a power source, with an inverter controlling the magnet's energization and demagnetization, eliminating the need for a battery by regenerating power back into the generator motor during demagnetization, and utilizing a capacitor to smooth voltage fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a battery is used as power supply for the magnet, then the magnet can be energized and demagnetized, but the device configuration becomes complex and costs increase
Solution Approach 1:
The patent extracts and removes the battery from the system, replacing it with direct generator-magnet connection. The generator motor serves dual functions as both power source and energy storage medium, eliminating the need for separate battery components and their associated management systems.
Solution Approach 2:
The generator motor performs multiple functions: it generates electrical power for magnet energization, stores energy during attraction, and enables regeneration during demagnetization. This multi-functionality replaces the specialized battery component while maintaining system reliability.
2Reliability
If a battery is used for power supply, then the magnet can operate, but the space for facilities increases
Solution Approach 1:
By removing the battery and its management systems, the patent significantly reduces the space required for power supply facilities. The generator motor, already present in the hybrid work machine, is utilized for magnet power supply without requiring additional space for separate battery installation.
3Reliability
If a battery is used for power supply, then the magnet can be energized, but the control system becomes complicated
Solution Approach 1:
The patent removes battery management control systems including charging rate maintenance and temperature control. The inverter directly controls magnet energization and demagnetization based on simple attraction/release commands, eliminating complex control algorithms required for battery management.
4Loss of energy
If electric power is regenerated during demagnetization, then energy efficiency improves, but voltage fluctuation occurs in the main circuit
Solution Approach 1:
The inverter acts as an intermediary between the generator motor and magnet, controlling the regeneration process. It manages the bidirectional power flow to enable energy recovery during demagnetization while maintaining main circuit voltage within acceptable ranges through its switching and control functions.
Solution Approach 2:
The inverter dynamically adjusts electrical parameters including voltage and current during regeneration. By controlling the switching timing and duty cycle, it manages the voltage fluctuations inherent in regenerative braking, enabling energy recovery while maintaining system stability.
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 simplifies the device setup, reduces costs and space requirements, and simplifies control by eliminating battery management complexities while ensuring reliable and quick load release operations without the risk of overvoltage adverse effects.
Implementation Method 1
a generator motor (8) driven by the engine (7)
Implementation Method 2
a magnet (6) mounted on a front end of the work attachment A
Implementation Method 3
an inverter (10) which controls a magnet voltage applied to the magnet (6)
Data Source
Figure 1
Figure 2
Figure 3(a)~3(d)
AI summary
Simplification of a device configuration and control is realized, which enables attraction and release by a magnet without using a battery. A magnet work machine includes a generator motor (8) driven by an engine (7); and an inverter (10) which controls a magnet (6) and the generator motor (8) such that the magnet (6) is energized by electric power from the generator motor (8) to attract metal scraps or the like, and during demagnetization for releasing metal scraps or the like, electric power applied to the magnet (6) is transmitted to the generator motor (8) as regenerative power so as to be consumed. The inverter (10) determines a torque of the generator motor (8) as a motor according to a voltage change of a main circuit based on a detected main circuit voltage so as to suppress the voltage change, and gives the torque as a command.