Intelligent monitoring device of motor

Abstract

The invention relates to an intelligent monitoring device of a motor. The intelligent monitoring device of the motor is characterized in that a simulation thermal memory analog protection circuit of the motor is combined with an intelligent digital control circuit to respectively form three simulation analog memory circuits of different data, i.e. a simulation analog memory circuit FA1, a simulation analog memory circuit FA2 and a simulation analog memory circuit FA3, single-chip microcomputer software is used for controlling the combination and a proper thermal memory protection curve can be automatically selected according to protection characteristics of motors with different power. A multi-channel current zero-sequence voltage measurement and amplification circuit is an AC / DC (Alternating-Current to Direct-Current) single-power-supply half-wave rectification and amplification circuit which is universally used by a current multi-channel amplification circuit, a voltage amplification circuit and a zero-sequence amplification circuit and is used for converting alternating-current signals into direct-current signals, a panel can be fixed through two methods, i.e. fixing clamps or top fixing clamps, a main case is small, the displayed characters are large by adopting four-digit LED (Light Emitting Diode) nixie tubes, the overall cost is decreased, the structure is reasonable and the intelligent monitoring device of the motor is convenient to use.

Description

technical field [0001] The invention relates to a motor intelligent protection system, in particular to a motor intelligent monitoring device. Background technique [0002] At present, the existing motor intelligent monitoring device has a variety of main shell structures, some of which are separate or conjoined with the current transformer, but most of them are large in size and complex in structure, which do not meet the needs of new products; multi-channel current Most of the zero-sequence voltage measurement amplifier circuits use relatively complex multi-channel isolated current measurement amplifier circuits, multi-channel isolated voltage measurement amplifier circuits and zero-sequence measurement amplifier circuits. It is beneficial to shrink the housing; the analog output circuit used to use existing integrated module products, which had disadvantages such as high cost and poor effect; most of the display decoding circuits used relatively complex liquid crystal dis...

AI Technical Summary

Problems solved by technology

[0002] At present, the existing motor intelligent monitoring device has a variety of main shell structures, some of which are separate or conjoined with the current transformer, but most of them are large in size and complex in structure, which do not meet the needs of new products; multi-channel current Most of the zero-sequence voltage measurement amplifier circuits use relatively complex multi-channel isolated current measurement amplifier circuits, multi-channel isolated voltage measurement amplifier circuits and zero-sequence measurement amplifier circuits. It is beneficial to shrink the housing; the analog output circuit used to use existing integrated module products, which had disadvantages such as high cost and poor effect; most of the display decoding circuits used relatively complex liquid crystal displays, which had many components, cumbersome debugging, and high cost; In the past, thermal memory protection was realized by single-chip software programming in the intelligent motor monitoring device. The disadvantage is that there is no memory when the power is turned off, and it cannot effectively protect the motor with excessively high temperature rise. Difficult to achieve

There are disadvantages such as poor effect, not suitable for motor intelligent protection system

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