Small-power motor power testing apparatus with power loss-free and wide measuring range properties

Abstract

The invention discloses a power testing apparatus for a small-power motor and the apparatus has power loss-free and wide measuring range properties. According to the invention, a front supporting seat is fixed on an active plate; a half axle is supported on the front supporting seat by a bearing; a moment rod is fixed on the axle body of the half axle; and a lower end of the moment rod is inserted into a testing position of a torque sensor. A rear end of the half axle and a center of a front end of a frame are fixed to each other; a rear end of the frame is fixed on an installation disk; a power shaft is arranged on the rear of the installation disk and is connected with a rear supporting seat through a bearing; the power shaft is connected with an input shaft of a dynamometer directly or by a speed change mechanism; and a rotating speed sensor is installed on the power shaft. According to the invention, a principle of a moment balance equation of Newton's third law is employed, wherein the equation is characterized in that sigma M is equal to an absolute value of-M, so that an equal corresponding relationship between a turning moment output by an output shaft of the motor and a counter turning moment that a housing of the motor is subjected to is obtained. And then the static counter torque, which is measured, is a torque output by the motor. The testing apparatus is free of losses and has a wide range; besides, an actual parameter value of the motor can be accurately tested by utilizing the testing apparatus.

Description

technical field [0001] The invention relates to a power testing device for a small motor with no loss and a wide range, which is used for power testing of high-speed brushless motors and small-power motors. Background technique [0002] At present, when motor manufacturers test the power of the motor, they always use the output shaft of the motor to directly connect with the power absorber. When the motor is outputting power, it must first overcome the inertia of the power absorber, so that the data of the torque sensor can be normal when the speed reaches a stable level. In the state of high speed, the loss caused by the coupling and high-speed rotating bearing cannot be measured. , especially in the case of testing tiny motors and high speeds, the measurement error cannot be estimated. Therefore, the accuracy of the traditional test method is poor, and it cannot truly reflect the real parameter value of the motor under test. At the same time, since the rotation speed and...

AI Technical Summary

Problems solved by technology

When the motor is outputting power, it must first overcome the inertia of the power absorber, so that the data of the torque sensor can be normal when the speed reaches a stable level. In the state of high speed, the loss caused by the coupling and high-speed rotating bearing cannot be measured. , especially in the case of testing tiny motors and high speeds, the measurement error cannot be estimated

Therefore, the accuracy of the traditional test method is poor, and it cannot truly reflect the real parameter value of the motor under test

At the same time, since the rotation speed and range of each power absorber cannot be changed, the traditional test method requires high manufacturing precision and sensitivity of the power absorber, which will inevitably lead to high cost of the power absorber, thus increasing the motor cost. cost of testing

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