ABSTRACT:
Aiming
at resolving the limitation of the speed regulation range of sensorless control
technology, a new composite sensorless control strategy is proposed to realize
a control method for a permanent magnet synchronous motor (PMSM) in full speed range.
In the medium- and high-speed range, the improved new sliding mode observer
method is used to estimate the motor speed and rotor position information. In
the zero and low speed range, in order to avoid the defects of the sliding mode method, the rotating high-frequency voltage signal injection method is used.
When switching between low, medium, and high speed, the fuzzy control algorithm
is adopted to achieve smooth transitions. The simulation experiment results
show that the hybrid mode combining the sliding mode observer and rotating
high-frequency voltage injection methods, can effectively reduce the jitter in
the algorithm switching process, and realize the smooth control of a PMSM in
full speed range.
KEYWORDS:
1. PMSM
2. Full speed range
3. Rotating high-frequency voltage signal injection method
4. Sliding mode observer method
5. Fuzzy Control
SOFTWARE: MATLAB/SIMULINK
BLOCK DIAGRAM:
Fig. 1 Schematic diagram of improved sliding mode
observer
EXPECTED SIMULATION RESULTS:
Fig. 2
The full range sensorless control waveform under the traditional weighting
algorithm
Fig. 3 Full range sensorless control waveform
based on fuzzy control
Fig. 4 Comparison of the speed waveforms of
the two control algorithms in the switching interval
Fig. 5 Comparison of the rotor position
waveforms of the two control algorithms in the switching interval
CONCLUSION:
In
this paper, the overall scheme design and control strategy of the PMSM
sensorless control system, are studied, and the control method of motor running
in the full-speed range, is analyzed in detail. The simulation results and
experiments show that the high-frequency signal injection method in the low-speed
range, and the sliding mode observer method in the medium and high speed range,
can accurately estimate the rotor position and speed, and the tracking speed is
fast. In the estimation process, the robustness improves. At the same time,
using fuzzy control in the low-speed to medium and high-speed range, can make
the PMSM switch smoothly, which has a certain application value.
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