Variable-Speed Speed-Up Gear Inertia Body Design
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Solution Overview
Problem
In variable-speed speed-up gears, the variable-speed motor can over-rotate due to the rotation rate of the constant-speed motor or inertia of the compressor when electric power is cut off, leading to rapid deceleration of the output shaft.
Innovation Solution
Incorporating a flywheel as an inertia body on the output shaft, connected to the constant-speed and variable-speed motors via a planetary gear transmission device, which slows down the deceleration of the output shaft and prevents over-rotation by increasing the moment of inertia, allowing for a longer stop time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the variable-speed motor is connected to the constant-speed motor via the planetary gear transmission device, then the rotation rate of the output shaft can be controlled by changing the rotation rate of the variable-speed motor, but the variable-speed motor may over-rotate due to the rotation rate of the constant-speed motor or the inertia of the compressor when electric power is cut off
Solution Approach 1:
The patent applies beforehand cushioning by installing a clutch mechanism in advance that can disengage the variable-speed motor from the planetary gear transmission device when over-rotation is detected. This preventive measure is prepared before the over-rotation problem occurs, allowing the system to protect itself by cutting off the rotational force from the variable-speed motor when the clutch activates, thereby preventing damage to the motor while maintaining the ability to control rotation rates during normal operation
2Reliability
If the variable-speed motor is stopped abruptly to prevent over-rotation, then the motor is protected from damage, but the output shaft experiences rapid deceleration which may cause mechanical stress
Solution Approach 1:
The clutch mechanism serves as a beforehand cushioning device that gradually disengages rather than abruptly stopping the variable-speed motor. When the clutch activates, it progressively cuts off the rotational force, allowing the motor to decelerate smoothly while still preventing over-rotation. This intermediate cushioning mechanism protects both the motor from damage and the mechanical system from stress caused by abrupt stopping
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
The added inertia body on the output shaft stabilizes the deceleration of the output shaft, preventing rapid deceleration and over-rotation of the variable-speed motor, ensuring a controlled stop and stable operation.
Implementation Method 1
the variable-speed rotor and the planetary gear carrier shaft have a shaft insertion hole which is formed in a cylindrical shape around the axis and passes therethrough in the axial direction, and the constant-speed rotor is inserted through the shaft insertion hole and has an inertia body which is configured to rotate in conjunction with the output shaft
Data Source
AI summary
The present invention provides a variable-speed speed-up gear including an electric driving device (50) that generates a rotational driving force, and a planetary gear transmission device (10) that changes the speed of the rotational driving force generated by the electric driving device (50) and transmit the changed rotation driving force to a driving target, wherein a sun gear shaft (12) forms an output shaft (Ao) connected to the driving target, an internal gear carrier shaft (37) configures a constant-speed input shaft (Ac), and a planetary gear carrier shaft (27) configures a variable-speed input shaft (Av), the electric driving device (50) includes a constant-speed motor (51) having a constant-speed rotor (52) which is configured to rotate a constant-speed input shaft of the transmission device, and a variable-speed motor (71) having a variable-speed rotor (72) which is configured to rotate the variable-speed input shaft of the transmission device, the variable-speed rotor (72) and the planetary gear carrier shaft (27) have a shaft insertion hole (74) which is formed in a cylindrical shape around the axis and passes therethrough in the axial direction, and the constant-speed rotor (52) is inserted through the shaft insertion hole (74) and has an inertia body (3) which is configured to rotate in conjunction with the output shaft (Ao).