Variable-Speed Speed Increaser Clutch for Over-Rotation Prevention
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Solution Overview
Problem
In variable-speed speed increasers, over-rotation of the variable-speed motor or driving target occurs due to the disconnection of electric power supply, leading to overvoltage or overcurrent, as both constant-speed and variable-speed motors are stopped, causing the compressor to over-rotate due to inertia.
Innovation Solution
A variable-speed speed increaser with a planetary gear transmission device and a clutch mechanism that includes a sun gear, planetary gear, internal gear, and a moving portion connected to an internal gear carrier, allowing disconnection of the constant-speed motor's driving force during power supply disruptions, preventing over-rotation by engaging and disengaging the Hirth coupling mechanism using oil pressure and a control system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If both constant-speed motor and variable-speed motor are stopped during power supply disruption, then electric power consumption is reduced, but the variable-speed motor and driving target over-rotate due to inertia
Solution Approach 1:
The patent extracts the constant-speed motor from the dual-motor system and connects it exclusively to the variable-speed motor's input shaft. This extracted constant-speed motor continues to operate during power disruptions, providing continuous rotational force to prevent over-rotation of the variable-speed motor and driving target, while the variable-speed motor can be stopped to reduce energy consumption.
Solution Approach 2:
The patent implements preliminary action by having the constant-speed motor already connected to the variable-speed motor's input shaft before power supply disruption occurs. This pre-established connection ensures that when the variable-speed motor stops due to power loss, the constant-speed motor is already in position to prevent over-rotation, eliminating the need for reactive control measures.
2Reliability
If constant-speed motor continues to operate during power supply disruption, then over-rotation of variable-speed motor is prevented, but electric power consumption increases
Solution Approach 1:
The patent segments the motor functions by separating the constant-speed motor and variable-speed motor into distinct roles. The constant-speed motor is dedicated to preventing over-rotation and maintaining basic operational stability, while the variable-speed motor handles variable speed control and can be stopped during power disruptions. This functional segmentation allows the system to maintain reliability through the constant-speed motor while minimizing energy consumption by stopping the variable-speed motor.
3Reliability
If clutch mechanism is added to disconnect constant-speed motor's driving force, then over-rotation is prevented, but device complexity increases
Solution Approach 1:
The patent merges the clutch mechanism's disconnecting function with the existing planetary gear transmission device. The clutch mechanism is integrated into the transmission system to control the connection between the constant-speed motor and the variable-speed motor's input shaft. This merging approach allows the clutch to perform its protective function while utilizing the existing transmission infrastructure, thereby reducing the overall complexity increase compared to adding a completely separate control system.
Data Source
AI summary
A variable-speed speed increaser includes: an electric driving device that generates a rotational driving force; and a transmission device that changes the speed of the rotational driving force generated by the electric driving device and transmits the changed rotation driving force to a driving target. The transmission device includes: a sun gear; a sun gear shaft fixed to the sun gear; a planetary gear that meshes with the sun gear; an internal gear; a planetary gear carrier that has a planetary gear carrier shaft; and an internal gear carrier that has an internal gear carrier shaft. The electric driving device includes: a constant-speed motor that has a constant-speed rotor; and a variable-speed motor that has a variable-speed rotor. The internal gear carrier includes a clutch mechanism that connects a cylindrical portion connected to the internal gear with the internal gear carrier shaft.