Measurable electrical quantity-based motor energy efficiency detection instrument

Abstract

The present invention provides a measurable electrical quantity-based motor energy efficiency detection instrument and belongs to the automatic electrical measurement field. The motor energy efficiency detection instrument includes a measurement system and a data acquisition and analysis system; two voltage transformers and two opening-closing type current transformers in the measurement system are fixed on an insulation substrate so as to form a measurement circuit, and the voltage transformers and the current transformers are connected with a USB data acquisition card and a measured three-phase alternating current motor; the output ends of the voltage transformers and the current transformers are connected with the analog quantity interfaces of the USB data acquisition card, so that the voltage transformers and the current transformers can be used for measuring the input end instantaneous voltage and current signals of the measured three-phase alternating current motor; a +15V/-15V double-switching power source unit is used for supplying power for the voltage transformers and current transformers so as to ensure the normal operation of the transformers; and the USB data acquisition card and a PC constitute a data acquisition and analysis system which performs sampling, maintenance and storage analysis on data measured by the voltage transformers and current transformers.

Description

technical field [0001] The invention belongs to the field of electrical automatic measurement, and relates to a device for automatic measurement of motor energy consumption, in particular, it can measure the power consumption of a field motor in real time without disassembling and assembling the motor. Background technique [0002] At present, the detection of motor energy consumption is generally obtained by installing a torque rotation measurement device such as a speed sensor on the stator shaft. However, due to the high speed, high torque, sealing and personal safety of large and medium-sized motor equipment, the rotor shaft is generally invisible, so it is not feasible to use the above detection method to measure the number of revolutions. Moreover, for speed sensors such as photoelectric encoders, it will cause difficulties in the installation of the motor and increase the cost. It will also lead to errors in mechanical installation accuracy and mechanical strength. Th...

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