Motor Adaptation Device Switching Sensitivity Stages
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Solution Overview
Problem
The high electronic complexity and cost of processors required to manage the operating signals of electronically commutated electric motors in hand-held tools, due to the need for sophisticated electronic monitoring and processing of multiple analog inputs, including high generator voltages and load currents, poses a challenge for efficient and cost-effective operation.
Innovation Solution
The solution involves an arrangement of field windings connected alternately to an energy source, with a potential point providing voltage to an evaluation unit via an adjustable device that switches between high and low sensitivity stages based on rotor position, allowing a single analog input to process both generator and load voltages, and utilizing rotational position sensors or commutators to determine the rotor position for precise control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple operating signals (generator voltage and load voltage) are processed separately through multiple analog inputs, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent combines the processing of generator voltage and load voltage into a single analog input channel by time-multiplexing the signals. The evaluation unit alternates between measuring generator voltage (when the winding is not energized) and load voltage (when the winding is energized), thereby reducing the number of analog inputs required while maintaining measurement precision through sequential sampling.
Solution Approach 2:
The patent employs dynamic switching between different measurement modes based on the operational state of the motor winding. The control circuit dynamically selects whether to measure generator voltage or load voltage depending on whether the winding is currently energized, allowing flexible adaptation to different operational phases without requiring separate dedicated input channels for each signal type.
2Reliability
If sophisticated electronic monitoring systems are used to prevent electrical overload, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent implements a self-service monitoring approach where the motor's own operational signals (generator voltage and load voltage) are used for self-diagnosis and protection. The evaluation unit monitors the motor's health by analyzing these inherent signals to detect abnormal conditions such as electrical overload, bearing faults, or rotor-stator contact, eliminating the need for separate external monitoring systems.
Solution Approach 2:
The patent establishes a feedback mechanism where the evaluation unit continuously monitors operating signals and uses this information to detect abnormal motor conditions. The system provides feedback about the motor's operational state, enabling real-time protection and fault detection without requiring complex external monitoring infrastructure.
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 reduces circuit complexity and processor requirements, enabling efficient operation with a compact, inexpensive processor that can handle varying signals with low power consumption, while ensuring safe and reliable motor control.
Implementation Method 1
An arrangement of field windings for the electromechanical drive of a rotor is provided, wherein the field windings are sequentially connected alternately to a power source such that a torque driving the rotor is exerted
Implementation Method 2
the generator voltage of the rotating electric motor can be tapped from a free phase connection of another winding
Data Source
Figure 1
Figure 1~2
Figure 3
AI summary
The electromotor has winding portions (3,4) that are connected with a power supply unit (11) such that propelling rotational torque acts on a rotor (7). The input of an evaluation unit is supplied to an adaption device (30). A drive circuit (90) is provided to switch the adaption device between a high sensitivity adapter stage and a low sensitivity adapter stage based on a rotor rotational position which is determined by an electronic commutator (10). The power supply unit is provided with a rechargeable lithium battery block.