Dynamic Imbalanced Force Generator with Independent Motor Drive
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Solution Overview
Problem
Existing dynamic imbalanced force generators are bulky and heavy due to the need for robust crankcases and mechanical couplings, which generate parasitic torque and limit their versatility and size efficiency.
Innovation Solution
A dynamic imbalanced force generator design featuring a shaft frame with radially arranged motor support plates and a gear system that includes reduction gears with toothed wheels of different diameters, allowing for counter-rotating imbalances with reduced size and weight, and enabling electronic control for versatile use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a robust crankcase with mechanical coupling is used to transmit dynamic imbalanced force, then the force transmission reliability is improved, but the device size and weight increase significantly
Solution Approach 1:
The patent extracts the force transmission function from the traditional robust crankcase structure. Instead of using a heavy crankcase to transmit forces, the invention allows each imbalance to be driven independently by separate motors, eliminating the need for a heavy force-transmitting crankcase structure while maintaining reliable force generation
Solution Approach 2:
The patent replaces the mechanical coupling system (toothed wheels, crankcase) with an electronic control system. Independent motors with electronic controllers drive each imbalance, substituting mechanical force transmission with electronically controlled independent rotation, thereby reducing the weight of stationary components
2Reliability
If external meshing of toothed wheels with large diameter is used to couple counter-rotating imbalances, then the mechanical coupling reliability is improved, but the actuator volume increases
Solution Approach 1:
The patent segments the coupling function by providing independent motors for each imbalance. Instead of mechanically coupling imbalances through large toothed wheels, each imbalance is independently driven by its own motor, eliminating the need for large external meshing gears and reducing actuator volume
Solution Approach 2:
The patent changes the arrangement dimension by positioning imbalances coaxially and side-by-side rather than using external meshing. This spatial reconfiguration allows independent mounting of small-diameter motors on each imbalance, reducing the overall actuator volume while maintaining operational reliability
3Volume of stationary object
If coaxial side-by-side arrangement of imbalances is used to reduce size, then the actuator volume is reduced, but parasitic torque is generated
Solution Approach 1:
The patent converts the potential harm of parasitic torque into a benefit by using independent electronic control of each imbalance. The electronic control system can precisely synchronize the rotation of coaxially arranged imbalances, ensuring that their centrifugal forces counterbalance each other and eliminating parasitic torque while maintaining the compact volume
4Object-generated harmful factors
If nested arrangement of imbalances is used to prevent parasitic torque, then parasitic torque is eliminated, but the overall size increases due to radial space requirements
Solution Approach 1:
The patent inverts the traditional nested arrangement by placing imbalances side-by-side in a coaxial configuration. Instead of nesting imbalances radially (one inside another), the invention arranges them horizontally adjacent to each other on the same axis, driven by independent motors, thereby eliminating parasitic torque while reducing the radial space 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
The design achieves a compact and lightweight dynamic imbalanced force generator with increased stiffness and versatility, capable of forming a variable dynamic imbalanced force generator, reducing parasitic torque and optimizing the force-to-mass ratio, suitable for applications like rotary-wing aircraft and machine tools.
Implementation Method 1
a gear system, wherein the shaft frame carries: a first imbalance constituted by an eccentric mass with respect to the shaft frame and rotatably connected to the shaft frame through two arms, one of which is fixed to the gear system; a second imbalance constituted by an eccentric mass with respect to the shaft frame rotatably connected to the shaft frame by an arm fixed to the gear system
Implementation Method 2
a first imbalance constituted by an eccentric mass with respect to the shaft frame and rotatably connected to the shaft frame through two arms
Data Source
AI summary
A dynamic imbalanced force generator includes a pair of eccentric masses and a shaft frame. The generator further includes at least one support plate of a motor arranged radially with respect to the shaft frame, and a gear system. A second imbalance is arranged between a first imbalance and the shaft frame, and coaxially with respect to the first imbalance. At least one motor is supported by the plate and engaged with at least one of the first and second imbalances by the gear system. The support plate and the motor are arranged between the imbalances and the shaft frame.