DC Motor Control Circuit Initialization Fault Detection
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Solution Overview
Problem
Existing methods for testing the control circuit of a DC motor fail to detect electronic faults before the motor is operational, making it difficult to identify issues with electronic switching elements, which can lead to unregulated operation or failure to operate.
Innovation Solution
A method and device that initialize the drive circuit by switching on the supply voltage and check the potential at the DC motor's voltage connections within a time window before startup, using a test device connected to the voltage connection to indicate any potential above a predetermined limit value as a fault, with an optical display for user notification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the control circuit is tested only after motor operation begins, then the motor can start immediately, but electronic faults in the control circuit cannot be detected early
Solution Approach 1:
The patent applies preliminary action by performing the fault detection test during the initialization phase, before the motor is actually started. The testing device checks the potential at the motor's voltage connections within a time window after supply voltage is applied but before the motor begins operation. This allows fault detection to occur in advance, resolving the contradiction between early fault detection and immediate motor startup.
2Ease of operation
If the supply voltage is applied continuously to the DC motor, then the motor can operate immediately, but the control circuit cannot be initialized properly for safe operation
Solution Approach 1:
The patent implements preliminary action by establishing a defined initialization sequence where the supply voltage is applied to the control circuit first, allowing it to initialize and perform self-tests before the motor is energized. The testing device monitors the control circuit's initialization status by checking potentials during this preliminary phase, ensuring the control circuit is ready and safe before motor operation begins.
Solution Approach 2:
The patent uses an intermediary approach by introducing a testing device that acts as a mediator between the supply voltage and the motor operation. This testing device monitors the initialization process and controls the timing of motor startup, ensuring that the control circuit is properly initialized and fault-free before allowing the motor to operate, thus bridging the gap between immediate operation and safe controlled startup.
3Device complexity
If no fault detection system is implemented, then the device complexity is reduced, but electronic faults cannot be detected and unregulated operation occurs
Solution Approach 1:
The patent applies self-service by enabling the control circuit to perform its own fault detection during the initialization phase. The testing device utilizes the control circuit's existing components and the potential differences that naturally occur during initialization to detect faults without requiring external test equipment or complex additional testing mechanisms. This self-diagnostic capability is integrated into the normal startup sequence, minimizing added complexity while maintaining high reliability.
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
Enables early detection of control circuit faults, preventing unregulated operation and ensuring the DC motor functions correctly by providing a clear indication of malfunctions during the initialization phase.
Implementation Method 1
the potential prevailing there is checked on at least one voltage connection of the direct current motor... if during the check a potential is present at the voltage connection of the direct current motor which is above a predetermined limit value, a fault can be assumed since the motor is already rotating before it is activated
Data Source
Figure 1~2
Figure 3
AI summary
The invention relates to a method for checking the function of a control circuit (10) of a DC motor (1), wherein electrical voltage terminals (4, 5) of the DC motor (1) are connected to a voltage source (7) via the control circuit (10). An operating switch (12) for starting the DC motor (1) via the control circuit (10) is arranged between the control circuit (10) and the voltage source (7). Switching on the operating switch (12) initializes the control circuit (10). During initialization, the potential (40) on a voltage terminal (4, 5) of the DC motor (1) is checked, and an indicator (30) is activated if the check detects a potential (40) on the voltage terminal (4, 5) of the DC motor (1) that is above a predetermined limit value (41).