Linear Actuator Control Circuit With Intermediate Switch Positioning
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Solution Overview
Problem
Linear actuators used in equipment like hospital beds and electric chairs often experience delays in reaction to user input, leading to inaccurate positioning and reduced comfort due to the time lag between switch activation and circuit response.
Innovation Solution
A linear actuator control circuit with a motor driving circuit, master control circuit, and intermediate switches is implemented, where the intermediate switches are strategically placed between the ends of the actuator's stroke to trigger the motor's stop when the sliding block reaches a precise position, ensuring accurate positioning through a push rod position detection circuit and relay configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a switch and circuit are used for controlling the linear actuator, then the actuator can be controlled to adjust angles of components, but there is a delay time from reaction by a person to entry into a comfortable situation to stopping of adjustment, resulting in inaccurate positioning
Solution Approach 1:
The patent applies preliminary action by pre-positioning multiple intermediate switches at specific locations along the sliding block's travel path. These switches are activated in advance as the block approaches, allowing the control system to anticipate the desired stopping position and begin deceleration earlier, thereby eliminating the delay between user input and actual positioning.
Solution Approach 2:
The patent implements feedback through intermediate switches that continuously monitor the sliding block's position and provide real-time signals to the control circuit. This feedback mechanism allows the system to detect when the block reaches predetermined positions and automatically adjust motor operation to achieve accurate stopping at the target position, eliminating the response delay inherent in simple switch-circuit systems.
2Measurement precision
If intermediate switches are added to the control circuit, then positioning accuracy is improved, but the device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the control function into multiple discrete intermediate switches positioned at different locations along the actuator's stroke. Each switch handles a specific segment of the positioning task, allowing the system to achieve high positioning accuracy through simple, modular switch-circuit combinations rather than a single complex control mechanism.
Solution Approach 2:
The intermediate switches are positioned to be automatically activated by the sliding block's own movement through the actuator's range of motion. The block physically triggers the switches as it passes their locations, eliminating the need for additional sensors, actuators, or complex control logic, thereby achieving enhanced positioning accuracy without proportionally increasing device complexity.
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 solution allows the sliding block to stop accurately at the intermediate switch position, enhancing positioning accuracy and user comfort by reducing the delay between user input and actuator response.
Implementation Method 1
a collector of the first triode is electrically connected to one end of a coil of the first relay, the other end of the coil of the first relay is electrically connected to a power source of the control circuit
Data Source
AI summary
Disclosed are a linear actuator control circuit capable of achieving accurate positioning, and a linear actuator. The control circuit comprises a motor driving circuit, a master control circuit and at least one intermediate switch; by disposing the intermediate switch between two ends of a stroke of the linear actuator, the intermediate switch can be triggered when the linear actuator runs to the intermediate switch; after the master control circuit receives information of the intermediate switch, running of the linear actuator is stopped, so that the linear actuator stops running when accurately running to a state that the intermediate switch is triggered, and then, accurate positioning of a sliding block on the linear actuator is achieved.