Variable-Speed Accelerator Clutch for Smooth Starting
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Solution Overview
Problem
The variable-speed accelerator experiences rough starting due to torque fluctuations caused by the specifications of the constant-speed and variable-speed electric motors.
Innovation Solution
A configuration that includes a constant-speed electric motor and a variable-speed electric motor with a planetary gear transmission device, where the variable-speed rotor can function as a generator or motor, and a clutch connects the rotors to share driving force, reducing the load on the constant-speed motor and preventing excessive rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a constant-speed electric motor and a variable-speed electric motor are used together in the electric device, then the speed control range is improved, but torque fluctuation occurs during starting
Solution Approach 1:
A clutch is introduced as an intermediary device between the constant-speed rotor and variable-speed rotor. The clutch selectively transmits driving force from the variable-speed rotor to the constant-speed rotor only when needed during starting, mediating the interaction between the two motors to prevent torque fluctuation while maintaining speed control versatility
Solution Approach 2:
The system dynamically adjusts the operational state of the clutch based on rotational speed conditions. When the variable-speed rotor's rotational speed exceeds the constant-speed rotor's rotational speed, the clutch engages to transmit driving force; otherwise, it disengages. This dynamic control resolves the contradiction by adapting the force transmission state to real-time operational conditions
2Speed
If the variable-speed rotor rotates at high speed in the second direction, then the speed control capability is improved, but excessive rotation may occur during motor failure
Solution Approach 1:
The clutch acts as a protective intermediary that prevents excessive rotation during failure conditions. When the variable-speed motor fails, the clutch disengages, blocking the transmission path and preventing the variable-speed rotor from causing excessive rotation of the constant-speed rotor and output shaft
Solution Approach 2:
The clutch is pre-configured to prevent harmful effects before they occur. By designing the clutch to disengage under failure conditions, the system proactively prevents excessive rotation and potential damage, rather than reacting after the problem occurs
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 allows for smooth starting of the variable-speed accelerator by reducing the load on the electric motors and preventing excessive rotation, enhancing the operational efficiency and reliability of the system.
Implementation Method 1
a variable-speed electric motor which includes a variable-speed rotor connected to the variable-speed input shaft of the planetary gear transmission device, which functions as a generator in a generator mode, which functions as an electric motor in an electric motor mode
Data Source
AI summary
A variable-speed accelerator includes: an electric device that generates a rotational driving force; and a planetary gear transmission device that changes a speed of the rotational driving force to a constant-speed input shaft and a variable-speed input shaft, and transmits the rotational driving force to a driving target via an output shaft, wherein the electric device includes a constant-speed electric motor including a constant-speed rotor that rotates the constant-speed input shaft in a second direction, and a variable-speed electric motor that includes a variable-speed rotor connected to the variable-speed input shaft, which functions as a generator in a generator mode and as an electric motor in an electric motor mode, and which rotates the output shaft at a maximum rotational speed by rotating the variable-speed rotor at the maximum rotational speed in a first direction.