II
Abstract
In the field of AC speed control, permanent magnet synchronous motors have the
advantages of small size, high reliability, and high operating efficiency. However, in
some special occasions, due to the limitation of the position sensor, the sensorless
control technology of the PMSM has become a research hotspot. This paper takes the
embedded permanent magnet synchronous motor as the research object, and conducts
in-depth research on the positionless control technology from the aspects of
improving dynamic performance and steady-state accuracy at zero low speed.
First, the physical model of the permanent magnet motor is introduced, and the
motor is mathematically modeled through coordinate transformation theory. The
commonly used vector control strategies are analyzed. The current control strategy
and voltage space vector modulation strategy are used to build a double closed-loop
of the PMSM. The speed control system verifies the vector control with sensors. In
order to study the effect of the low-pass filter on the control system, the current loop
and the speed loop are modeled and analyzed.
Secondly, the high-frequency model of the permanent magnet synchronous
motor is established, and the high-frequency rotating sinusoidal voltage signal
injection without position control technology is introduced. From the principle
analysis to the estimated rotor position information extraction process. In order to
simplify the signal processing process, the positionless control based on
high-frequency pulse signal injection is studied. Two schemes are proposed to extract
the estimated rotor position under the estimated rotating shaft system and the
measured shaft system, and a simulation model is established to verify the feasibility
of the scheme. In order to reduce the use of band-pass filters when extracting
high-frequency currents, the trajectories of high-frequency response currents are
analyzed, and an estimated rotor position extraction scheme based on high-frequency
current vector angles is studied to improve the dynamic performance of the control
system. In order to reduce the effect of DC bias when extracting high-frequency
current, a new type of adaptive filter is designed to effectively suppress the DC bias.
Combined with the high-frequency current vector angle rotor position extraction
scheme, a simulation model is established and verifie effectiveness of the program.
Then, in order to reduce the use of low-pass filters when extracting the estimated
rotor position and improve the dynamic performance of the system, the
high-frequency square wave injection without position control was studied. Estimate
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andyshar2023-05-04支持这个资源，内容详细，主要是能解决当下的问题，感谢大佬分享~
