Belted Transmission System for High-Speed Motor Testing
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Solution Overview
Problem
Current industrial electric motors are inadequate for meeting the increased power and speed requirements of modern electric and hybrid vehicle motors, making it difficult to validate their performance effectively in test stands.
Innovation Solution
A belted transmission system coupled with load motors, featuring a spindle with a larger diameter at one end and bearings to facilitate rotation, along with a sprocket that receives belts from the load motors to drive the spindle and load the device under test, providing higher power and speed capabilities without a gearbox.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If current industrial electric motors are used, then the system is simple and reliable, but the power and speed capabilities are insufficient for modern electric and hybrid vehicle motors
Solution Approach 1:
The system divides the power transmission function into separate components: load motors, belts, sprockets, and a spindle. This segmentation allows each component to be optimized independently while achieving the required 300-500 kW power capability that single motors cannot provide
Solution Approach 2:
Multiple load motors are combined to work together through the belted transmission system, merging their individual power outputs to achieve the total power requirement. The belts merge the rotational motion from multiple motors to drive the common spindle
2Speed
If higher speed capabilities are implemented, then modern motor validation is enabled, but torque transmission challenges increase
Solution Approach 1:
The belted transmission system acts as an intermediary between the load motors and the device under test. The belts and sprockets provide a flexible power transmission medium that can accommodate high speeds while maintaining torque transmission through the belt drive mechanism
Solution Approach 2:
The system changes the transmission parameters by using belt drives instead of direct mechanical coupling, allowing for variable speed and torque characteristics. The belt tension, sprocket diameters, and motor speeds can be adjusted to optimize the speed-torque profile for different testing requirements
3Device complexity
If gearbox-free design is used, then maintenance and complexity are reduced, but noise and heat management become more challenging
Solution Approach 1:
The gearbox component is extracted and removed from the system entirely. The belted transmission directly couples the motors to the spindle without intermediate gear mechanisms, eliminating gear noise and reducing mechanical complexity while requiring separate management of belt-driven noise and heat
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
Enables the testing of modern electric and hybrid vehicle motors at speeds up to 20,000 RPM and loads of 300-500 kW, while allowing for interchangeable components and flexible speed-torque adjustments, overcoming challenges of torque transmission, noise, and heat management.
Implementation Method 1
The spindle comprises one or more bearings configured to facilitate rotation of the shaft
Implementation Method 2
The sprocket is configured to receive one or more belts coupled to the one or more load motors such that the shaft is driven by the one or more belts to turn the spindle
Data Source
AI summary
The present disclosure relates to a belted transmission system configured to couple with load motors to provide a load to a device under test. The belted transmission system comprises a spindle coupled with the device under test. The spindle comprises various components configured to facilitate high operational speeds and increased power relative to prior art systems. For example, the spindle comprises a shaft having a larger diameter at one end compared to the other, one or more bearings configured to facilitate rotation of the shaft, and a sprocket coupled to the shaft configured to receive belts coupled to load motors such that the shaft is driven by the one or more belts to turn the spindle and load the device under test. The belted transmission includes a housing configured to enclose the belts and at least a portion of the spindle.