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A method and system for detecting the position of a permanent magnet motor
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A permanent magnet motor, phase difference technology, applied in control systems, AC motor control, linear motor control and other directions, can solve the problems of increasing product variety and complexity, and achieve the effect of increasing applicability and improving efficiency
Active Publication Date: 2021-08-13
ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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When the pole distance is changed, the distance of the Hall element must also be changed accordingly. Products with different pole distances need to be equipped with different detection components, which increases the variety and complexity of products.
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Embodiment 1
[0064] This embodiment provides a method for detecting the position of a permanent magnet motor, such as figure 1 shown, including steps:
[0065] S1. Determine the amplitude and phase difference of the signal through offline training;
[0066] S2. Obtain the position of the permanent magnet motor mover through online calculation;
[0067] Step S1 includes:
[0068] S11. Collecting the first voltage signal output by two groups of Hall elements when the mover in the permanent magnet motor spanning several permanent magnet pole pitch periods is in motion;
[0069] S12. Calculate the collected first voltage signals output by the two groups of Hall elements to obtain the amplitudes of two sine or cosine waveforms corresponding to the first voltage signals output by the two groups of Hall elements;
[0070] S13. Read the value of the first voltage signal output by the two groups of Hall elements corresponding to the time, and then calculate several angles corresponding to the re...
Embodiment 2
[0126] This embodiment provides a system for detecting the position of a permanent magnet motor, such as Figure 9 shown, including:
[0127] Offline module, online module;
[0128] The offline module is used to determine the amplitude and phase difference of the signal through offline training;
[0129] The online module is used to obtain the position of the permanent magnet motor mover through online calculation;
[0130] The offline modules include:
[0131] The first collection module is used to collect the first voltage signal output by several Hall elements when the mover in the permanent magnet motor is moving;
[0132] The first calculation module is configured to calculate the collected first voltage signals output by the several Hall elements to obtain the amplitude corresponding to the first voltage signals output by the several Hall elements;
[0133] The second calculation module is used to read the value of the first voltage signal output by several Hall elem...
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Abstract
A method for position detection of a permanent magnet motor involved in the present invention, comprising: S11. collecting voltage signals output by two groups of Hall elements when the mover in the permanent magnet motor is in motion; S12. collecting the two groups of voltage signals collected The voltage signal output by the Hall element is calculated to obtain the amplitude of 2 sine or cosine waveforms corresponding to the output voltage signals of the 2 groups of Hall elements; S13. Read the output voltages of the 2 groups of Hall elements corresponding to the time The value of the signal is calculated to obtain several angles corresponding to the read value, and the phase difference of the output voltage signal of the two groups of Hall elements is obtained according to the rising or falling trend of each angle; S21. 1 pair of voltage signals output by 2 groups of Hall elements when the mover in the magneto is moving; S22. According to the amplitude and phase difference obtained in steps S12 and S13 and the value of 1 pair of voltage signals collected in real time in step S21, The position of the permanent magnet motor mover is calculated by the angle calculation algorithm.
Description
technical field [0001] The invention relates to the technical field of motor position detection, in particular to a method and system for detecting the position of a permanent magnet motor. Background technique [0002] Permanent magnet motors have a series of advantages such as small size, light weight, high efficiency, and small torque ripple, so they are more and more widely used in modern AC motion control systems. The accurate and reliable rotor position directly affects the control effect of the permanent magnet synchronous motor (PMSM). How to determine the position of the rotor or mover is a very important part in engineering practice. [0003] At present, there are mainly the following location detection methods: [0004] 1) Position detection based on grating encoder: The grating encoder is a digital detection device that integrates light, mechanics, and electricity, and is widely used in the position detection of motor rotors. Its most prominent feature is that ...
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Patent Type & Authority Patents(China)
IPC IPC(8): H02P6/16H02P25/064
CPCH02P6/006H02P6/16H02P25/064
Inventor 蔡炯炯柯鹏马健瞿晓王子辉
Owner ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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