Servo Position Sensor Layout Using Non-Coaxial Gear Transmission
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Solution Overview
Problem
Conventional servos with coaxially arranged position sensors face challenges in minimizing size due to low space utilization and potential interference between the motor and sensor, limiting their compactness.
Innovation Solution
The position sensor is arranged non-coaxially with the output shaft by utilizing a transmission gear mechanism that transmits the rotation angle to the sensor, allowing for efficient use of internal space and preventing interference, while maintaining a coaxial arrangement between the output shaft and housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the position sensor is arranged coaxially with the output shaft, then the sensor can directly receive rotation signal from the output shaft, but the space utilization rate is low and there is interference between the motor and sensor
Solution Approach 1:
A transmission gear mechanism is introduced as an intermediary between the output shaft and the position sensor. The transmission gear transmits the rotation signal from the output shaft to the position sensor, enabling the sensor to be positioned non-coaxially while maintaining measurement accuracy. This mediator resolves the spatial conflict between the motor and sensor.
Solution Approach 2:
The position sensor is relocated from a coaxial arrangement to a non-coaxial position, utilizing different spatial dimensions within the servo housing. This dimensional repositioning allows the sensor to be placed in an area that does not interfere with the motor, thereby reducing the overall cross section size while maintaining functionality.
2Area of stationary object
If the position sensor is arranged non-coaxially with the output shaft, then space utilization is improved and interference between motor and sensor is prevented, but the sensor cannot directly receive rotation signal from the output shaft
Solution Approach 1:
The transmission gear mechanism serves multiple functions: it transmits the rotation signal from the output shaft to the position sensor, enables compact non-coaxial arrangement, and maintains measurement accuracy. This multi-functionality justifies the added complexity by delivering multiple benefits simultaneously.
3Device complexity
If the position sensor is arranged coaxially with the output shaft, then the structure is simple, but the space utilization rate is low
Solution Approach 1:
The sensor is repositioned from a coaxial (one-dimensional alignment) to a non-coaxial arrangement, utilizing two-dimensional space within the servo housing. This allows more efficient use of the available internal space, placing the sensor in an optimal location that does not waste volumetric capacity.
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 enhances space utilization and prevents interference, enabling a more compact servo design without compromising the accuracy of the position sensor's angle measurement.
Implementation Method 1
a transmission gear is engaged with the output shaft and rotates synchronously with the output shaft, and the position sensor is located at an axis of the transmission gear
Data Source
AI summary
A servo includes a housing, and a motor, a reduction gear drive mechanism, an output shaft, a position sensor and at least two stages of transmission gear. The reduction gear drive mechanism is connected with motor and the output shalt of the servo, the reduction gear drive mechanism used to transmit power from the motor to the output shaft of the servo. A head stage of the transmission gear is located on a tail end of the output shaft of the servo, and the position sensor is located at an axis of a tail stage of the transmission gear. The at least two stages of transmission gear transmit a rotation angle of the output shaft of the servo to the position sensor by a ratio of 1:1, the position sensor is not arranged coaxially with the output shaft of the servo.