Electric Bed Motor Speed Feedback for Synchronized Dual Motion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Electric beds with unequal mechanical resistances and varying user weights result in motors rotating at different speeds, affecting user experience and synchronicity in double electric beds, leading to rough and unsynchronized motion.
Innovation Solution
A method involving sensors and microcontrollers to detect and adjust motor rotational speeds, ensuring they maintain a predetermined speed by calculating average actual speeds and inputting difference signals to driver circuits, synchronizing the motion of dual motors in double electric beds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the motor rotates at high speed to overcome the load, then the motor can drive the movable bed plate, but the rotational speed varies under different loads, reducing user experience consistency
Solution Approach 1:
The patent employs a feedback control mechanism where a sensor detects the actual rotational speed of the motor, compares it with the target speed, and adjusts the motor drive signal accordingly. This closed-loop feedback system ensures the motor maintains consistent rotational speed despite variations in load conditions, directly resolving the contradiction between power output and speed consistency.
Solution Approach 2:
The patent dynamically adjusts motor control parameters based on detected rotational speed. By changing the drive signal parameters in response to speed deviations, the system maintains optimal rotational speed across varying load conditions, transforming a static motor control approach into a dynamic adaptive control system.
2Adaptability or versatility
If two motors drive the double electric bed, then the bed can move independently on both sides, but unequal rotational speeds cause asynchronous motion, making the bed movement look rough
Solution Approach 1:
The patent implements synchronized feedback control for dual motors by detecting the rotational speed of each motor individually and adjusting their drive signals to maintain equal speeds. This ensures that while each motor can operate independently to provide versatile motion control, their speeds remain synchronized to produce smooth, coordinated bed movement.
Solution Approach 2:
The patent creates a equipotential control state for the two motors by ensuring they operate at equal rotational speeds through feedback adjustment. This balances the independent motion capability with synchronized performance, making the dual-bed system move smoothly without rough or uneven motion.
3Force
If the motor speed is increased to handle maximum load, then the motor can overcome heavy weight, but the motor rotates too fast under light load, affecting precision and experience
Solution Approach 1:
The patent transforms the motor control from a static fixed-speed approach to a dynamic adaptive control system. The motor speed is continuously adjusted based on actual load conditions through feedback detection, allowing the system to optimize rotational speed for each operating condition rather than maintaining a constant high speed.
Solution Approach 2:
The feedback control mechanism detects actual rotational speed and compares it with the target speed appropriate for the current load. The system then adjusts the drive signal to eliminate speed deviations, ensuring precise speed control whether the motor is handling maximum load or light load, thereby improving both force handling and speed precision.
Data Source
AI summary
A method of controlling a rotational speed of a motor of an electric bed includes the following steps. (A) Use a sensor to detect rotation of the motor, set a predetermined rotational speed of the motor in a microcontroller, and use the microcontroller to calculate actual rotational speeds of the motor. (B) Use the microcontroller to calculate an average actual rotational speed of the motor at each of sampling time points in a predetermined period. (C) Use the microcontroller to compare the average actual rotational speed of the motor with the predetermined rotational speed to obtain a difference signal. (D) Input the difference signal to a driver circuit to adjust the rotational speed of the motor until the average actual rotational speed of the motor is equal to the predetermined rotational speed. In this way, the motor of the electric bed can approximately rotate in the predetermined rotational speed.