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Method for measuring actual power of DC hub motor for electric bicycle through maximum speed measurement

A technology of electric bicycles and hub motors, which is applied in the direction of motor generator testing, etc., and can solve problems such as the inability to measure the motor

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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 measuring actual power of DC hub motor for electric bicycle through maximum speed measurement
  • Method for measuring actual power of DC hub motor for electric bicycle through maximum speed measurement
  • Method for measuring actual power of DC hub motor for electric bicycle through maximum speed measurement

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Embodiment Construction

[0019] In the present invention, when the real rated power of a motor is not known, the DC hub motor is first installed on the corresponding electric bicycle vehicle to run, and the maximum speed of the vehicle is measured, that is to say, the rated power of the motor must be able to drive An e-bike (with a standard rider) runs normally and continuously. The vehicle speed, the linear velocity (km / h), is converted into the angular velocity (r / min) of the motor rotation through the physical formula, and this speed point is used as the speed value of the rated load point, and as the rated point loaded by the dynamometer , the corresponding output power when the motor is loaded to this speed, as the rated power of the motor.

[0020] The theoretical basis of the present invention is that (1) when the input voltage of the DC motor is constant, the relationship of "speed-output power" of the motor is a straight line. The speed of the DC motor decreases with the increase of the load...

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Abstract

The invention provides a method for measuring the actual power of a DC hub motor for an electric bicycle through maximum speed measurement. The method comprises the steps: calculating the rotating speed of the motor under the condition that the motor power is not known according to the speed of the electric bicycle driven by the motor and the diameter of the hub motor; loading the rotating speed through employing a hysteretic dynamometer because there is a linear relation between the DC motor and a load; measuring the motor power at the rotating speed, and enabling the motor power to serve as the actual power of the motor. The method is suitable for the hub motor, and can effectively solve a problem that the actual power cannot be determined after the power of the DC motor is marked to be larger. The method enables a rule that the motor power cannot be greater than a certain value in a national finished electric bicycle standard to be a check 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 hub motor for an electric bicycle by using the highest vehicle speed. Background technique [0002] The electric bicycle standard GB17761-1999 stipulates that the power of the DC motor used for electric bicycles should not exceed 240W. The motors currently in use are marked with a rated power of 450W. 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 motor. Under the rated power, read the input electric power parameters (voltage , current,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/34
Inventor 薛宇
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