Resolution method and resolver for signals of rotating transformer

A resolver and angle signal technology, applied in the solver field, can solve the problems of high cost, cost reduction, high price, etc., and achieve the effect of cost reduction

Inactive Publication Date: 2009-09-02
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

[0005] In order to overcome the disadvantages of high price and high cost in the prior art, the present invention provides a resolver signal solution method applied in a high-precision servo system, which adjusts the output of the resolver in real time and outputs a digital signal process

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  • Resolution method and resolver for signals of rotating transformer

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Embodiment Construction

[0030] The method embodiment includes the following steps:

[0031] 1) Rotate the motor a full circle, collect the angle signal feedback from the resolver installed on the motor shaft, and obtain the peak and valley values ​​of the angle signal waveform. The peak value is 4095, and the valley value is 0. In the digital signal processor 11 The sine table with a period of 0 to 1 / 4 period is stored in the sine table, the amplitude is 2048 to 4095, and the corresponding angle is 0 to 90°, which is used for table lookup and interpolation calculation.

[0032] 2) Sampling the current low-frequency sine signal U s (θ) and low frequency cosine signal U c (θ) and convert these two angle values ​​into digital quantities X and Y respectively. At the same time, save the current X and Y as X_bak and Y_bak respectively, and compare with the next sampling result to determine the rotor rotation direction.

[0033] 3) Divide the angular position θ of the rotor into four quadrants, which are 0~90°,...

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Abstract

The invention discloses a resolution method and a resolver for signals of a rotating transformer. The method comprises the steps of: acquiring a rotating angle signal of a motor and establishing a sine table, sampling a current low-frequency sinusoidal signal and a current low-frequency cosine signal, dividing the angle position of a rotor into four quadrants, and determining the quadrant which the position of the rotor belongs to; and performing the lookup of the sine table according to the low-frequency sinusoidal signal and the position of the rotor, and judging the rotation direction of the rotor. A sinusoidal excitation signal generator is connected with the rotating transformer and differential signal converters, and a sinusoidal differential signal feedback by the rotating transformer passes through the differential signal converter, then is input into a precision absolute value adder along with a reference signal, passes through a low-pass filter and then is input into a digital signal processor; and a cosinoidal differential signal feedback by the rotating transformer passes through another differential signal converter, then is input into the precision absolute value adder along with the sinusoidal excitation signal which passes through a phase inverter, passes through the low-pass filter and then is input into the digital signal processor. The resolution method and the resolver greatly reduce the cost, and can perform accurate sampling and conversion on input signals.

Description

Technical field [0001] The invention relates to a resolver signal solution method, and also relates to a resolver adopting the method. Background technique [0002] One of the keys to a high-performance gearless (also called direct drive) rotary servo system is how to accurately measure the angular position of the output shaft of the servo motor. Commonly used angle sensors include absolute grating encoders, Hall sensors, and resolvers. The absolute grating encoder directly converts the angle of the shaft into a digital signal, which is simple and convenient to use, but it is difficult to be widely used due to factors such as environmental adaptability and price. The Hall sensor has a simple structure, but it is difficult to meet the requirements of high-precision angle measurement. Resolvers are widely used in high-precision servo systems due to their reliable structure, good real-time performance, and strong environmental adaptability. [0003] Resolver is a sensor that can be ...

Claims

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Application Information

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IPC IPC(8): H02P6/16G01D5/244H02P6/08H02P6/30
Inventor 卢刚李声晋周奇勋张举中张君刘仕钊肖文超
Owner NORTHWESTERN POLYTECHNICAL UNIV
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