A method for detecting electrical zero point and electrical angle of spliced ​​arc motor rotor

Abstract

The invention discloses a detection method of an electrical zero point and an electric angle of a rotor of a splicing arc motor. A large-diameter steel band type photoelectric encoder is installed on the splicing arc motor. A linear Hall sensor and a switch Hall sensor are installed in an armature magnetic circuit of the splicing arc motor. The output of the linear Hall sensor is subjected to impedance transformation by use of high speed double comparators, and two electric zero point signals are detected. The electric zero point signals and the switch Hall signal pass an AND gate circuit, and one electric zero point signal is output between each pair of poles. After the electric zero point signal is subjected to long-line driving, the obtained electric zero point signal, and A and B signals of the steel band type photoelectric encoder pass a differential receiver and then are converted into single end signals. Through the isolation of a photoelectric coupler, the electric angle of the rotor of the splicing arc motor is detected through a DSP digital signal processor. According to the invention, detection of the electric zero point of the rotor of the splicing arc motor in any size can be achieved; the position of the electric angle is calculated; and ultra low speed and big torque operation of a telescope is achieved.

Description

technical field [0001] The invention relates to a method for detecting the electrical zero point and electrical angle position of a motor rotor, in particular to a method for detecting the electrical zero point and the electrical angle position of a spliced ​​arc motor rotor used for driving a large astronomical telescope frame. Background technique [0002] Astronomical telescopes are mainly used to collect faint radiation from celestial bodies. The ability to collect light is reflected in the ability to find farther and fainter targets. The larger the aperture of the telescope, the stronger the ability to collect light energy. With the increasing diameter of telescopes, the traditional mechanical transmission and driving methods are no longer suitable for the development of large-diameter telescope technology. At present, most of the large-scale astronomical telescope racks in the world are driven by splicing direct drive motors. [0003] As the aperture of the telescope i...

AI Technical Summary

Problems solved by technology

This brings great difficulties and risks to the processing of the telescope frame. If a low-speed, multi-pole spliced ​​arc (linear) motor design is selected, the steel belt photoelectric encoder is not selected properly, and the length of the encoder is too long. The processing accuracy requirements will increase, and it is likely to need to be reprocessed and installed with a steel belt photoelectric encoder like the GTC telescope, which will bring great risks to the final assembly and operation of the telescope frame.

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