Coil Driver Holding Control With External Force Detection
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Solution Overview
Problem
Existing driver devices for stepping motors and solenoid actuators lack the capability to detect external forces applied to movable parts during holding control, leading to potential mechanical failure and destabilization of control systems.
Innovation Solution
A driver device equipped with an external force detector that monitors the state of power supply and current flowing through the coil to detect changes in the movable part's state, allowing for appropriate measures to be taken during holding control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If holding control is performed to maintain the movable part's state unchanged, then the position stability is improved, but the system becomes vulnerable to external forces causing undetected rotation and control destabilization
Solution Approach 1:
The patent implements feedback by continuously monitoring the output current supplied to the coil during holding control. The control circuit detects changes in the current waveform that indicate external force application, enabling the system to respond to deviations from the desired held state and maintain control reliability.
Solution Approach 2:
The patent replaces mechanical detection methods (such as encoders or mechanical switches) with an electrical detection method. By monitoring the electrical current characteristics in the coil, the system can detect external forces without adding mechanical sensing components, thus maintaining position stability while improving control reliability.
2Difficulty of detecting and measuring
If a separate encoder is added to detect external forces, then the detection capability is improved, but the device complexity and cost increase
Solution Approach 1:
The patent makes the existing current control circuit multi-functional by enabling it to perform both its original function of controlling motor operation and the additional function of detecting external forces. The same current sensing and control circuitry is used to monitor for external force conditions, eliminating the need for separate detection hardware.
Solution Approach 2:
The system uses its own operational parameters (the current flowing through the coil) to detect external forces. The current characteristics that define the motor's operation also serve as the detection signal for external force conditions, allowing the system to self-diagnose without external sensing equipment.
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 the detection of external forces applied to movable parts, preventing mechanical failure and stabilizing control systems by recognizing and responding to changes in the output current waveform.
Implementation Method 1
a driver device that moves a movable part with the magnetism generated by supplying an output current to a coil
Implementation Method 2
an output stage circuit configured to supply the output current to the coil by applying a voltage to the coil
Data Source
AI summary
A driver device includes a control circuit for controlling an output stage circuit for supplying an output current to a coil, and makes a movable part move with the magnetism generated by the supplied output current. The control circuit can perform holding control to hold the state of the movable part unchanged by suspending its movement. During the holding control by the control circuit, application of an external force tending to change the state of the movable part against the holding control is detected based on the state of supply of electric power to the coil by the output stage circuit, the output current, or the current flowing through the output stage circuit.