Sliding Door Motor Angle Detection via Shunt Resistor Feedback
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Solution Overview
Problem
The existing sliding door control devices require three Hall ICs for detecting the rotation angle of the motor, which increases manufacturing costs and are prone to failure if any of the ICs malfunction, necessitating an alternative method for rotation angle detection.
Innovation Solution
A sliding door driving device that uses a shunt resistor to detect the rotation angle of the motor by converting DC power into AC power and incorporating a control device to obtain the rotation angle based on the shunt resistor's output, eliminating the need for position sensors and enhancing resistance to failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If three Hall ICs are installed to detect the rotation angle of the motor, then the rotation angle detection capability is improved, but the manufacturing cost increases and the reliability decreases due to potential component failure
Solution Approach 1:
The invention extracts the rotation angle detection function from the Hall IC position sensors and relocates it to the shunt resistor, which is already present in the motor driving circuit for current measurement. This eliminates the need for separate position sensing components while maintaining detection capability.
Solution Approach 2:
The shunt resistor is given a dual function: it continues to serve as a current measurement component while simultaneously performing rotation angle detection. This multi-functionality reduces the total number of components needed in the system.
2Measurement precision
If three Hall ICs are installed to detect the rotation angle of the motor, then the rotation angle detection capability is improved, but the manufacturing cost increases
Solution Approach 1:
The invention extracts the rotation angle detection function from the Hall IC position sensors and relocates it to the shunt resistor, which is already present in the motor driving circuit for current measurement. This eliminates the need for separate position sensing components while maintaining detection capability.
Solution Approach 2:
The shunt resistor is given a dual function: it continues to serve as a current measurement component while simultaneously performing rotation angle detection. This multi-functionality reduces the total number of components needed in the system.
3Measurement precision
If position sensors are used to detect the rotation angle of the motor, then the rotation angle detection capability is improved, but the device complexity increases
Solution Approach 1:
The invention extracts the rotation angle detection function from the Hall IC position sensors and relocates it to the shunt resistor, which is already present in the motor driving circuit for current measurement. This eliminates the need for separate position sensing components while maintaining detection capability.
Solution Approach 2:
The shunt resistor is given a dual function: it continues to serve as a current measurement component while simultaneously performing rotation angle detection. This multi-functionality reduces the total number of components needed in the system.
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 for reliable detection of the motor's rotation angle using a shunt resistor, reducing the reliance on position sensors and improving the system's resilience to component failures, thereby enhancing the overall reliability and cost-effectiveness of the sliding door driving device.
Implementation Method 1
a shunt resistor disposed between the power source and the power conversion device, and wherein the control device obtains a rotation angle of the motor based on an output of the shunt resistor
Data Source
AI summary
A sliding door driving device includes: a power source; a motor that outputs power to open and close the door; a motor driving circuit that connects the power source and the motor to each other; and a motor control device that controls the motor driving circuit. The motor control device includes an inverter that converts DC power supplied from the power source into AC power, and a shunt resistor disposed between the power source and the inverter. The position detection unit of the motor control device obtains the rotation angle of the motor based on the output of the shunt resistor.