Electric Motor Test System Cogging Torque Measurement
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electric motor test systems require time-consuming and labor-intensive alignment procedures to accurately measure cogging torque, often resulting in misalignment and inaccurate measurements.
Innovation Solution
An electric motor test system that connects the electric motor, dynamometer, and cogging torque measurement motor without detaching the motor from the dynamometer, using a connecting/disconnecting mechanism to facilitate cogging torque measurement while preventing high-speed damage to the cogging torque measurement motor, and employing a speed reducer for low-speed stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the electric motor is detached from the dynamometer and connected to a dedicated cogging torque measurement device for measurement, then the cogging torque can be measured, but the measurement process becomes time-consuming and labor-intensive due to alignment procedures
Solution Approach 1:
The patent combines the dynamometer and cogging torque measurement device into a single integrated system. The dynamometer's rotating shaft can function as the measurement shaft for cogging torque measurement, eliminating the need for separate measurement equipment and alignment procedures. This merging allows both performance testing and cogging torque measurement to be conducted without detaching the electric motor.
Solution Approach 2:
The dynamometer is designed with multi-functionality to serve both as a performance testing device and as a cogging torque measurement device. By configuring the dynamometer's rotating shaft to also serve as the measurement shaft, the system can perform multiple functions without requiring separate dedicated equipment, thereby saving time and reducing operational complexity.
2Measurement precision
If the electric motor is detached and reconnected for cogging torque measurement, then measurement can be performed, but misalignment such as centering errors may occur leading to inaccurate measurements
Solution Approach 1:
The patent merges the measurement shaft function into the dynamometer's rotating shaft, eliminating the need for repeated detachment and reconnection. This integration ensures consistent alignment since the shaft configuration remains unchanged, thereby preventing misalignment errors and improving measurement reliability.
Solution Approach 2:
The system is pre-configured with the measurement shaft integrated into the dynamometer's rotating shaft structure. This preliminary arrangement ensures that proper alignment is maintained by design, eliminating the need for repeated alignment procedures and preventing misalignment errors before they can occur.
3Ease of operation
If the cogging torque measurement motor is connected to the dynamometer, then cogging torque can be measured, but the motor may be damaged during high-speed regular tests
Solution Approach 1:
The patent implements a dynamic connection system where the cogging torque measurement motor is selectively connected to or disconnected from the dynamometer based on the test mode. During cogging torque measurement, the motor is connected to drive the rotating shaft at low speeds. During regular high-speed performance tests, the motor is disconnected to prevent damage from high-speed rotation, thus maintaining motor durability while enabling convenient measurement when needed.
Solution Approach 2:
The system pre-configures the connecting/disconnecting mechanism to automatically switch between measurement mode and test mode. Before high-speed regular tests begin, the mechanism preliminarily disconnects the cogging torque measurement motor from the dynamometer to prevent damage, while maintaining the capability to reconnect for measurement when required.
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 easy and accurate measurement of cogging torque without the need for alignment, preventing motor damage during regular tests and simplifying the system configuration by using a single torque sensor for both cogging and regular torque measurements.
Implementation Method 1
measure the torque generated between the electric motor and the dynamometer
Implementation Method 2
transmitting the rotation of the cogging torque measurement motor to the electric motor
Data Source
Figure 1
Figure 2
Figure 3
AI summary
In order to easily and accurately measure the cogging torque of an electric motor, the present invention includes a dynamometer 10 connected to an electric motor 200, a torque sensor 30 adapted to measure the torque of the electric motor 200, and a cogging torque measurement motor 50 for measuring the cogging torque of the electric motor 200, and is configured such that when measuring the cogging torque of the electric motor 200, the electric motor 200, the dynamometer 10, and the cogging torque measurement motor 50 are connected.