A Sampling Method for Single Resistor Current of Three-phase Permanent Magnet Synchronous Motor
A permanent magnet synchronous motor, single-resistor technology, applied in the control of generators, motor generators, electronic commutation motor control and other directions, can solve problems such as adverse control effects, discontinuous current, inaccurate control, etc. The resistance sampling area and the scheme realize the effect of simple and high continuity
Active Publication Date: 2022-03-04
JILIN UNIV
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Problems solved by technology
This overcomes the problem of inaccurate control due to duty cycle changes when the sampling time of the traditional scheme is short
[0005] In the above-mentioned patents, the problem of inaccurate control of duty cycle changes can be solved, but the main problem of this solution is that because the sampling of the current is not carried out simultaneously, the current obtained by sampling is discontinuous, which will cause disadvantages to the control influences
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[0035] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be viewed as limiting the scope. As far as personnel are concerned, other related drawings can also be obtained based on these drawings on the premise of not paying creative work.
[0036] A method for sampling the single resistance current of a three-phase permanent magnet synchronous motor, using a sampling circuit and a three-phase drive circuit, such as figure 1 As shown, the specific steps of the method are as follows:
[0037] Step 1: Phase shift.
[0038] The time to obtain the high level of the three-phase output in the current cycle is T a ,Tb ,T c , sort these three times in descending order and represent them as T max ,T mid ,T min , record T1=T max -T mid ,T 2 = T mid -T min , and note that the minimum ...
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The invention relates to a sampling method for a single resistance current of a three-phase permanent magnet synchronous motor, comprising the following steps: S1: Obtain the time of the three-phase output high level in the current cycle, and divide the three times into sampling according to the sequence from large to small area and non-sampling area and perform phase shifting respectively; S2: set sampling points for the sampling area and non-sampling area divided in step S1, and obtain corresponding sampling current values; S3: divide in step S1 The current obtained in the sampling area and the non-sampling area are respectively processed to reconstruct the phase current to obtain the three-phase current. Compared with the three-resistor scheme, the method provided by the present invention has the advantage of low cost. Compared with the traditional single-resistor scheme, the single-resistance sampling area can be greatly expanded, the current has extremely high continuity, and the implementation of the scheme is very simple.
Description
technical field [0001] The invention relates to the field of motor control, in particular to a sampling method for single-resistance current of a three-phase permanent magnet synchronous motor. Background technique [0002] Permanent magnet synchronous motors are widely used in household products due to their advantages of high efficiency and energy saving. In order to further reduce the system cost, the single-resistor sampling scheme has attracted widespread attention. [0003] There are certain restrictions on the scheme of using a single resistor to sample the bus current and then reconstruct the three-phase current. The sampling can only be carried out when the three phases have effective voltage vector output, and the sampling time must be ≥ the dead time and the time when the sampling current is stable. In areas with low modulation coefficients and areas across sector boundaries, the single-resistor sampling scheme is completely ineffective, and the voltage phase in t...
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IPC IPC(8): H02P21/14
CPCH02P21/14
Inventor 田彦涛郝正强杨阳龚依民车晓镭张剑楠张晨晨宋红达郝正杰
Owner JILIN UNIV