Hybrid Position Observer and Position Sensorless Servo System for Permanent Magnet Synchronous Motor

A technology of permanent magnet synchronous motor and mixed position, which is applied in the direction of control system, control generator, vector control system, etc., and can solve problems such as lack of technical solutions

Active Publication Date: 2020-09-15
SHANDONG UNIV
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  • Claims
  • Application Information

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Problems solved by technology

However, there is still a lack of effective technical solutions on how to realize the smooth transition between the zero- and low-speed zones and the medium- and high-speed zones, and how to design an effective dead-zone nonlinear compensation strategy to solve the impact caused by the dead-zone nonlinearity of the inverter.

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  • Hybrid Position Observer and Position Sensorless Servo System for Permanent Magnet Synchronous Motor
  • Hybrid Position Observer and Position Sensorless Servo System for Permanent Magnet Synchronous Motor
  • Hybrid Position Observer and Position Sensorless Servo System for Permanent Magnet Synchronous Motor

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Embodiment Construction

[0095] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0096] As introduced in the background technology, in the prior art, there is a smooth transition between the estimated value of rotor position angle and rotational speed estimated by the HFI scheme in the zero and low speed regions and the stator observer scheme in the middle and high speed regions. This scheme estimates the lack of out-of-step when the speed difference is large. The speed-adaptive stator flux observer needs the actual stator voltage information. Considering the cost and the measurement difficulty of the pulse voltage generated by PWM modulation, the voltage Most of them are replaced by the output of the current loop regulator, and there are certain differences between the two due to factors such as the dead zone of the inverter and the turn-on voltage drop of the inverter switching device, which affects the estimation accuracy of the r...

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Abstract

The present invention discloses a mixed position observer of permanent magnet synchronous motor and a sensorless servo system. A current detection module collects a three-phase current of a permanentmagnet synchronous motor to convert the three-phase current to an actual current in a d-q coordinate system and input the actual current to a mixed position observer; the mixed position observer processes the actual current to obtain an angular velocity weighing law, after the weighing processing through a weighing module, a feedback value and a rotor position angle of the rotation speed of a rotor are obtained, the feedback value of the rotation speed of the rotor and a set target rotation speed are subjected to difference processing and regulation, and the current required by a q axis and afundamental wave feedback current are subjected to difference processing and regulation to obtain a q-axis control voltage; and a current required by a d axis and the fundamental wave feedback currentare subjected to difference processing and regulation to obtain a d-axis control voltage, the d-axis control voltage is superposed with a high-frequency square wave voltage and is converted to a voltage in an [Alpha]-[Beta] coordinate system, an SVPWM controller is employed to output the six-path PWM to control the output of a three-phase inverter so as to control the operation of the permanent magnet synchronous motor.

Description

technical field [0001] The present disclosure relates to the field of servo control of permanent magnet synchronous motors, in particular to a hybrid position observer and position sensorless vector control servo for permanent magnet synchronous motors operating at full speed based on a combination of stator flux observer and high-frequency square wave injection method. System and dead zone compensation method. Background technique [0002] A servo system composed of a permanent magnet synchronous motor (Permanent magnet synchronous motor, PMSM) has been widely used in aerospace, industrial fields, electric vehicles, and household appliances. As we all know, position information plays a pivotal role in the servo system. According to whether a photoelectric encoder or a resolver is used, the servo system can be divided into a positional servo system and a non-positional servo system. The present disclosure relates to a position sensorless PMSM vector control servo system. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/13H02P21/18H02P21/28H02P27/08
CPCH02P21/13H02P21/18H02P21/28H02P27/085
Inventor 刘锦波
Owner SHANDONG UNIV
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