Cycloidal Winding Drive for Compact Torque Control
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Solution Overview
Problem
Existing winding/unwinding devices face challenges in achieving compactness, precise torque control, and modularity, particularly in handling significant reductions and sudden jolts, while also being cost-effective and adaptable to various applications.
Innovation Solution
The proposed winding/unwinding device incorporates a synchronous permanent magnet engine with a cycloidal reducer, featuring a mobile input shaft, a coaxial output shaft, and a cycloidal disc system that allows for eccentric and cycloidal movement, enabling a wide range of reduction ratios and improved torque control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a bevel gear reducer is used to achieve significant reduction ratios, then the reduction capability is improved, but the device becomes less compact and cannot withstand significant jolts
Solution Approach 1:
The patent replaces the traditional bevel gear mechanical system with a cycloidal mechanism. The cycloidal disc engages with fixed pins to generate the cycloidal motion, eliminating the need for complex bevel gear arrangements while achieving higher reduction ratios in a more compact form factor.
Solution Approach 2:
The patent employs cycloidal curves in the disc geometry to achieve the desired motion transformation. The cycloidal path of the disc perimeter points generates the characteristic motion that provides both high reduction ratio and compactness, replacing straight-cut gear teeth with curved cycloidal profiles.
2Power
If a bevel gear reducer is used, then the reduction ratio is achieved, but the device cannot withstand brief and/or significant jolts due to limited tooth contact
Solution Approach 1:
The patent merges multiple engagement points between the cycloidal disc and fixed pins, creating simultaneous contact across the disc perimeter. This distributed contact mechanism spreads shock loads across multiple points rather than concentrating them at single gear tooth contacts, significantly improving shock resistance.
3Productivity
If an asynchronous motor is used, then the device can operate, but torque control accuracy deteriorates with deviations of around 15%
Solution Approach 1:
The patent implements a feedback control system using an encoder to monitor the actual position and speed of the motor shaft. This feedback is fed to the frequency inverter, which adjusts the motor commands in real-time to compensate for slippage and maintain accurate torque control, directly addressing the asynchronous motor's inherent inaccuracies.
4Measurement precision
If electronic regulation with frequency inverter is used, then torque control is achieved, but modularity deteriorates when controlling multiple motors
Solution Approach 1:
The patent designs a universal control architecture where a single frequency inverter can control multiple asynchronous motors through coordinated feedback from encoders on each motor. This multi-functional control system maintains precise torque control while enabling modular configurations with one, two, or three motors depending on application requirements.
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 solution provides a compact, modular, and cost-effective winding/unwinding system with precise torque control, capable of handling significant reductions and sudden jolts, while being adaptable to various applications through the use of multiple synchronous engines.
Implementation Method 1
at least one permanent magnet synchronous motor comprising a rotor arranged around a first part of the output shaft, the rotor being integral in rotation with the input shaft
Implementation Method 2
in which each cam is eccentric, so that a rotation of each cam around the longitudinal axis causes a rotation of the at least one cycloidal disc according to an eccentric and cycloidal movement
Data Source
Figure 1
Figure 2a
Figure 2b
AI summary
The invention describes a device for winding/unwinding a link, comprising: - an input shaft (10) and a hollow through output shaft (20), the two shafts being coaxial and able to rotate about a longitudinal axis (L), - a synchronous motor (30) with permanent magnets and comprising a rotor (31) that rotates as one with the input shaft (10), - a cycloidal reducer (50) comprising an eccentric cam (51) mounted so as to rotate as one with the input shaft (10), and a cycloidal disc (52) mounted so as to rotate as one with the cam (51), such that rotation of the cam (51) around the longitudinal axis (L) causes the cycloidal disc (52) to rotate according to an eccentric and cycloidal movement, and - a transmission member (60) suitable for transmitting an angular movement of the cycloidal disc (52) to the output shaft (20).