Variable-Speed Speed Increaser Emergency Stop Clutch
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Solution Overview
Problem
When an apparatus intended to drive a rotary machine is urgently stopped, the rotation rate of the variable-speed motor exceeds the rated rotation rate due to the inertia of the rotary machine, posing a safety risk.
Innovation Solution
A variable-speed speed increaser is designed with a claw clutch mechanism that includes a sun gear, planetary gear, and internal gear transmission system, where an electromagnet is used to disengage the claw clutch when the system is urgently stopped, preventing the variable-speed motor from exceeding the rated rotation rate by disconnecting it from the transmission device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power supply is cut off during urgent stop, then constant-speed motor rotation rate is spontaneously reduced, but variable-speed motor rotation rate exceeds rated rotation rate due to rotary machine inertia
Solution Approach 1:
The clutch mechanism is pre-positioned to disconnect the variable-speed motor from the transmission device during emergency stop conditions. The moving device is configured to automatically engage or disengage the clutch before the motor speed can exceed safe limits, preventing overspeed damage proactively rather than reactively.
Solution Approach 2:
A clutch mechanism acts as an intermediary between the variable-speed motor and the transmission device. This mediator can selectively connect or disconnect the motor from the load, allowing the motor to be isolated during emergency stops while the transmission device and rotary machine continue their deceleration under inertia without dragging the motor along.
2Reliability
If clutch engaging elements are moved in axial direction for disengagement, then variable-speed motor can be disconnected from transmission device, but requires additional moving device complexity
Solution Approach 1:
The moving device that actuates the clutch engaging elements axially is configured to replace complex multi-component mechanical actuation systems. By using a simplified axial movement mechanism (such as a spring-loaded plunger or electromagnetic actuator), the patent achieves reliable clutch engagement and disengagement while minimizing the complexity of the moving device structure.
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 solution effectively prevents the variable-speed motor from rotating at a higher rate than the rated rotation rate during emergency stops, ensuring safe disconnection and preventing potential damage or hazards.
Implementation Method 1
a moving device which is configured to move one of the first clutch engaging element and the second clutch engaging element in the axial direction
Data Source
AI summary
A variable-speed speed increaser includes: an electric driving device which is configured to generate a rotational driving force; and a transmission device which is configured to change the speed of the rotational driving force generated by the electric driving device and transmit the changed rotation driving force to a driving target. The transmission device includes a sun gear which is configured to rotate about an axis, a sun gear shaft which is fixed to the sun gear and extend in an axial direction around the axis, a planetary gear which is configured to mesh with the sun gear, revolve around the axis and rotate about its own center line, an internal gear which has a plurality of teeth aligned annularly around the axis and is configured to mesh with the planetary gear, and a planetary gear carrier which has a planetary gear carrier shaft.