Three-phase asynchronous motor load torque and power factor measurement system and method

Abstract

The invention discloses a three-phase asynchronous motor load torque and power factor measurement system and method. The system comprises a microprocessor module, a voltage sensor set and a current censor set. The voltage sensor set comprises a phase A voltage sensor, a phase B voltage sensor and a phase C voltage sensor. The current sensor set comprises a phase A current sensor, a phase B current sensor and a phase C current sensor. An input end of the microprocessor module is connected with a phase A signal conditioning circuit, a phase B signal conditioning circuit and a phase C signal conditioning circuit. An output end of the microprocessor module is connected with an LCD circuit. The method comprises the steps of signal real-time collection and transmission, signal preprocessing, and three-phase asynchronous motor load torque calculation and output. The system and the method are designed reasonably, can be achieved conveniently with a low cost, and is convenient for use and operation, high in working reliability and practicality, good in timeliness and use effect, and easy to promote and use.

Description

technical field [0001] The invention belongs to the technical field of mechanical quantity measurement, in particular to a system and method for measuring load torque and power factor of a three-phase asynchronous motor. Background technique [0002] Load torque is an important working parameter of rotating power machinery, and has become an important part of mechanical quantity measurement. Moreover, abnormal behaviors such as vibration and interference in the mechanical system can be reflected by the change of the load torque on the output shaft of the motor. For example, the vibration generated during the gear meshing will affect the change of the motor load torque at a fixed frequency. Therefore, if the real-time load torque value of the motor can be measured accurately, reliably and conveniently, it will be beneficial for real-time monitoring and fault analysis of rotating power machinery. [0003] At present, the way to measure the load torque is to measure the load ...

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Problems solved by technology

Therefore, only enough space can only be left in the design of the shearer, which increases the difficulty of design

[0004] In addition, in the prior art, the measurement of the power factor and load torque of the three-phase asynchronous motor is also measured by independent devices, the integration level is low, and there is no power factor measurement with simple circuit structure, high working reliability and high measurement accuracy. device

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