Servo Motor Sensor Extraction for Compact Design
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Solution Overview
Problem
Conventional servos with brushless motors face challenges in minimizing size due to the internal placement of position sensors, which hinders compact design and affects heat dissipation.
Innovation Solution
The placement of position sensors outside the motor on a circuit board, allowing for a compact servo design with improved heat dissipation, where a first detected member on the motor's rotating shaft and a second on the output shaft are detected by respective magnetic encoding chips or other sensors, enabling real-time angular position detection without the need for internal sensor placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the position sensor is arranged within the motor, then the rotational position of the rotating shaft can be detected in real time, but the size of the motor increases and heat dissipation is hindered
Solution Approach 1:
The position sensor is extracted from the motor interior and relocated to the external circuit board. The detected member remains on the motor shaft while the detecting element is positioned outside the motor, separating the sensing function from the motor structure to reduce motor volume and improve heat dissipation.
2Measurement precision
If the position sensor is arranged within the motor, then real-time rotational position detection is achieved, but heat dissipation performance deteriorates
Solution Approach 1:
The position sensor is extracted from the motor interior and relocated to the external circuit board. The detected member remains on the motor shaft while the detecting element is positioned outside the motor, separating the sensing function from the motor structure to reduce motor volume and improve heat dissipation.
3Measurement precision
If the position sensor is arranged within the motor, then rotational position detection is enabled, but the compactness of the servo design is compromised
Solution Approach 1:
The position sensor is extracted from the motor interior and relocated to the external circuit board. The detected member remains on the motor shaft while the detecting element is positioned outside the motor, separating the sensing function from the motor structure to reduce motor volume and improve heat dissipation.
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 configuration reduces the motor's size, enhances heat dissipation, and facilitates efficient control, resulting in a more compact and effective servo mechanism.
Implementation Method 1
a first magnetic encoding disc 411 and a first magnetic encoding chip 412 respectively fixed to the rotating shaft 11 and the circuit board 50, and the first magnetic encoding chip 412 is used to detect a rotational angle of the rotating shaft 11 based on changes caused by rotation of the first magnetic encoding disc 411
Implementation Method 2
a second magnetic encoding disc 611 and a second magnetic encoding chip 612 respectively fixed to the output shaft 20 and the circuit board 50, and the second magnetic encoding chip 612 is used to detect a rotational angle of the output shaft 20 based on changes caused by rotation of the second magnetic encoding disc 611
Data Source
AI summary
A servo includes a motor having a rotating shaft, an output shaft disposed apart from the rotating shaft, a transmission mechanism to transmit mechanical power from the motor to the output shaft, a circuit board, a first detected member fixed to an end of the rotating shaft, a second detected member fixed to an end of the output shaft adjacent to the circuit board; and a first detecting member and a second detecting member mounted on the circuit board and configured to respectively detect rotational angles of the rotating shaft and the output shaft, based on changes caused by rotation of the first detected member and the second detected member.