Tandem Motor Drive-Train Testing System Resonance Suppression
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Solution Overview
Problem
Existing drive-train testing systems face limitations in generating high driving torque without increasing the diameter of the motor, which restricts the testing of various vehicle types and reproducibility.
Innovation Solution
A drive-train testing system utilizing two motors connected in tandem, with a resonance suppression circuit to divide the torque command and suppress torsion resonance, allowing for high driving torque generation without enlarging individual motors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the diameter of the motor is increased to generate higher driving torque, then the driving torque capability is improved, but the layout restriction of the testing system worsens
Solution Approach 1:
The patent divides a single high-power motor into two smaller motors connected in tandem. Each motor generates partial torque, and their combined effect produces the required high driving torque. This segmentation allows the testing system to achieve high torque capability without requiring an excessively large motor diameter that would conflict with layout restrictions.
2Power
If two motors are connected in tandem to generate high driving torque, then the driving torque capability is improved, but the torsion resonance of the axis worsens
Solution Approach 1:
The patent implements a resonance suppression circuit that uses feedback control to detect and counteract torsion resonance in the axis connecting the two motors and workpiece. The circuit monitors the rotational state and adjusts the torque distribution between the two motors to suppress resonant vibrations, thereby eliminating the harmful effect while maintaining high driving torque capability.
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 generation of high driving torque while protecting the mechanical system from resonance, enhancing test reproducibility and accommodating a wider variety of vehicle types.
Implementation Method 1
a resonance suppression circuit for dividing the torque command into a first torque command for the first motor and a second torque command for the second motor, based on a detected value of the shaft torque detection means, so as to suppress torsion resonance of an axis that connects the first motor, the second motor, and the workpiece
Data Source
AI summary
The present invention provides a drive-train testing system that is capable of generating a large drive torque without increasing the size of a motor that simulates an engine. The drive-train testing system inputs a drive torque, which is generated according to a torque command which contains an alternating-current component having an excitation frequency, to an input shaft of a workpiece in order to evaluate the performance of said workpiece. This system is equipped with a first motor, a second motor, a torque meter for detecting a torque which acts upon the shaft between the workpiece and the second motor, and a resonance suppression circuit that divides the torque command into a first torque command and a second torque command so as to suppress torsional resonance on the basis of a value detected by the torque meter.