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Method for determining practical power of DC motor for electric bicycle via maximum efficiency point

An electric bicycle, the most efficient technology, applied in the field of measurement of the actual power of the motor, can solve the problem that the motor cannot be measured

Active Publication Date: 2015-11-18
WUXI INSPECTION TESTING & CERTIFICATION INST
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  • 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

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  • Method for determining practical power of DC motor for electric bicycle via maximum efficiency point
  • Method for determining practical power of DC motor for electric bicycle via maximum efficiency point

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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...

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PUM

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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

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/34
Inventor 薛宇黄晓东叶震涛
Owner WUXI INSPECTION TESTING & CERTIFICATION INST
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