Supercharge Your Innovation With Domain-Expert AI Agents!

Method for Determining Actual Power of DC Motors Used in Electric Bicycles Using the Point of Maximum Efficiency

An electric bicycle, the most efficient technology, is applied in the field of measuring the actual power of the motor, and can solve the problem of not being able to measure the motor.

Active Publication Date: 2018-03-30
WUXI INSPECTION TESTING & CERTIFICATION INST
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the power of the motor does not reach the nameplate, the motor will not be able to rotate, so this traditional test method can measure the motor "large with small scale", but it cannot measure the "small scale with large scale" of the motor

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for Determining Actual Power of DC Motors Used in Electric Bicycles Using the Point of Maximum Efficiency
  • Method for Determining Actual Power of DC Motors Used in Electric Bicycles Using the Point of Maximum Efficiency

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0016] The present invention adopts the same test instrument as the traditional motor test without knowing the real rated power of a motor, and adopts the opposite test idea. First measure a complete "efficiency-output power" curve of the motor, use the graphing method to find the highest efficiency point on the curve, and calculate the corresponding output power, and use the found power point as the rated power of the motor. Then carry out the test of rated power input electrical parameters (voltage, current, power, power factor) and output mechanical parameters (torque, speed).

[0017] The theoretical basis of the present invention is that (1) the "efficiency-output power" curve of the motor must be a convex and substantially symmetrical curve. (2) In the electromagnetic design of the motor, the highest efficiency point of the motor must be designed as the main load and rated load point in the actual use of the motor, so that the motor can run most stably, with suitable tem...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a method for determining the practical power of a DC motor for an electric bicycle via the maximum efficiency point. Under the condition that the motor power is not notified, a curve of efficiency-output power of the motor is measured, the maximum efficiency power of the motor can be found in the curve via the plotting method, and the practical power of the DC motor is determined by utilizing the principle that a designer tends to design the practical rated power of the motor as the maximum efficiency point. The method provided by the invention can effectively solve the problem that the power of the DC motor may be marked in a faked manner and cannot be determined, and enables that the motor power should not be higher than certain power in the national standard for the electric bicycle and can serve as the examination index.

Description

technical field [0001] The invention relates to a method for measuring the actual power of a motor, in particular to a method for measuring the actual power of a DC motor for an electric bicycle by using the highest efficiency point. Background technique [0002] The electric bicycle standard GB17761-1999 stipulates that the power of DC motors for electric bicycles should not exceed 240W. The motors currently used are marked with a rated power of 350W. In fact, in order to make electric bicycles run faster, the more they are loaded, the more motor power Large, but the power on the nameplate only indicates 450W. There is a large number of "big to small" phenomenon. Similar to the trucks running on the road, they clearly carry 20 tons, but the driving license indicates 8 tons. [0003] At present, the test methods for all motors at home and abroad are to first look at the power on the motor nameplate, and then use various dynamometers to gradually load the rated power of the...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/34
Inventor 薛宇黄晓东叶震涛
Owner WUXI INSPECTION TESTING & CERTIFICATION INST
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com