Measurement circuit and measurement method for rotation speed of CW type electric eddy current dynamometer

Abstract

The present invention provides a measurement circuit for the rotation speed for a CW type electric eddy current dynamometer, which comprises a revolution speed transducer, a rotation speed signal processing module, a control module and a display module, wherein the rotation speed signal processing module comprises a signal processor (PICI6F877) and a rotation speed signal arranging circuit; a signal output end of the revolution speed transducer is connected with a rotation speed signal input end of the signal processor and a clock pulse synchronous counting trigger end through the rotation speed signal arranging circuit; a display signal output end of the signal processor is connected with a display signal input end of the display module; and a control signal input end of the signal processor is connected with a control signal output end of the control module. The measurement circuit has the advantages of high measuring accuracy and stable performance, and is suitable for different types of the CW type electric eddy current dynamometer. The invention also provides a measurement method for the rotation speed, which comprises the following steps: segmentally collecting the rotation speed in low rotation speed and high rotation speed respectively; and reducing computation workload in the low rotation speed, improving the measuring accuracy in high rotation speed, and achieving the aims of performing operation monitoring control in the low rotation speed and alarming when running at overspeed.

Description

technical field [0001] The invention relates to the technical field of measurement and control of a CW type eddy current dynamometer, in particular to the application of single chip technology in the rotational speed measurement of a CW type eddy current dynamometer and a measurement method used in the technology. Background technique [0002] Since the constant speed characteristic is one of the most important performance characteristics of the eddy current dynamometer, the eddy current dynamometer has high requirements on the control accuracy of the speed loop. figure 1 The technical solution shown in this technical solution is an analog system, except that the counting circuit, the logic forming circuit for outputting the display signal, and the segment code driving circuit are digital systems; The circuit needs to be specially welded according to the specific eddy current dynamometer, so the process is cumbersome and the production and matching efficiency of components i...

AI Technical Summary

Problems solved by technology

[0002] Since the constant speed characteristic is one of the most important performance characteristics of the eddy current dynamometer, the eddy current dynamometer has high requirements on the control accuracy of the speed loop. figure 1 The technical solution shown in this technical solution is an analog system except that the counting circuit, the logic forming circuit for outputting display signals, and the segment code driving circuit are digital systems; due to the difference in the number of teeth and models during production and assembly, the hardware The circuit needs to be specially welded according to the specific eddy current dynamometer, so the process is cumbersome, and the production and matching efficiency of components is low

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