Power meter for micro motor

Abstract

The invention relates to a power meter for a micro motor. The power meter comprises a frame, a pulley, a rope, a rotation speed measuring device, pulling force sensor, an electronic scale, electromagnets and an instrument, wherein the pulley is fixed at the driving end of the motor to be metered, the rope is wound around the pulley, the pulling force sensor is limited in the upper portion of the frame, the force sensing direction of the pulling force sensor is vertically downward, the upper end of the rope is fixed to the sensing end of the pulling force sensor, the electronic scale is supported in the lower portion of the frame, the electromagnets are supported by a weighing disk of the electronic scale, and controlled by an adjustable power supply, the attraction force of the electromagnets is vertically downward, the lower end of the rope is fixed to an armature of the electromagnets, and the instrument receives output signals of the rotation speed measuring device, the pulling force sensor and the electronic scale. A measurement result of the power P of the motor is output according to the equation that P=n(GX+(G0-G)-F)(R+r), n represents to the rotation speed of the metered motor, GX represents the weight of the armature, G0 represents the weight, weighed by the electronic scale, of the electromagnets before electrification, G represents the weight, weighed by the electronic scale, of the electromagnets when being electrified in set voltage, F represents the pulling force measured by the pulling force sensor, R represents the radius of the pulley, and r represents the radius of the rope. The power meter can be used to measure the output power of the micro motor automatically.

Description

technical field [0001] The invention relates to a micro-motor dynamometer, in particular to its loading device and control, which can belong to G01L3 / 00 in the international patent classification table. Background technique [0002] The national industry standard JB / T9544 "Test Methods for Small Power Synchronous Motors" provides a torque measurement method for tiny motors with a shaft power of less than a few watts - the rope pulley method. The torque measurement device of the prior art rope pulley method is measured by manually increasing or decreasing weights, which has low working efficiency and therefore the measured torque characteristic can only be intermittent, and it is difficult to directly obtain the output power of the motor under test instantaneously. Contents of the invention [0003] The technical problem to be solved by the present invention is to propose a micro-motor dynamometer, which can improve the existing problems of the prior art. [0004] The tech...

AI Technical Summary

Problems solved by technology

In the prior art, the torque measurement device of the rope pulley method is measured by manually increasing or decreasing weights, and the work efficiency is low. Therefore, the measured torque characteristic can only be intermittent, and it is difficult to directly obtain the output power of the motor under test instantaneously.

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