Motor revolving speed measurement and fault state detection system

Abstract

The invention discloses a motor revolving speed measurement and fault state detection system, which comprises a filtering circuit, a frequency doubling and phase discriminating circuit, a speed counter and a revolving speed calculating and fault detection module, wherein the filtering circuit is used for filtering a three-phase interference pulse signal output by a motor encoder, and the filtered signal is output to the frequency doubling and phase discriminating circuit; the frequency doubling and phase discriminating circuit is used for carrying out frequency doubling processing on an encoder pulse signal; when the encoder rotates, the rotation direction of the encoder is judged by judging a B-phase electrical level; a signal subjected to frequency doubling processing is output to the speed counter; the speed counter is used for counting high-frequency clock pulse and encoder frequency doubling pulse according to an M / T anemometry principle within set speed sampling time; the revolving speed calculating and fault detection module is used for calculating the revolving speed value of the motor; and meanwhile, the signal pulse is detected to obtain encoder fault information. The motor revolving speed measurement and fault state detection system disclosed by the invention can be suitable for a wider motor revolving speed work range, can be used for detecting the information state of motor encoder faults and is convenient for system to find faults in time and carry out necessary processing.

Description

technical field [0001] The invention relates to a measurement system in the technical field of wind power generation, in particular to a system suitable for measuring the rotational speed of a generator in a wind power generation system and detecting a fault state of a motor. Background technique [0002] In a wind power generation system, the speed of the wind generator is an essential quantity for its closed-loop control. As wind power technology gradually extends from land to sea, offshore wind power has become the focus of the world's renewable energy development. Due to the harsh and changing environment at sea, higher requirements are put forward for the high-speed and accurate measurement of the motor speed in the control system. Using FPGA to realize the measurement of motor speed has the advantages of simple circuit structure, low cost and high resolution, so it has a wide range of applications in the speed measurement of wind power generators. Motor speed detecti...

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Problems solved by technology

[0004] The technical solution of the above invention patent provides a simple and practical encoder speed measurement method and system, which can obtain very accurate speed measurement values ​​at high and low speeds, but the designed speed measurement system does not have the ability to detect encoder fault information status function, the wind power converter cannot realize timely shutdown protection under fault conditions

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