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A sensorless control method for low-speed synchronous motor based on adaptive filter

An adaptive filter, synchronous motor technology, applied in motor generator control, AC motor control, electronic commutation motor control and other directions, can solve the problems of complicated design process of speed estimator parameters and great influence on estimator performance, etc. Achieve the effect of enhancing low frequency attenuation capability and improving control accuracy

Active Publication Date: 2018-01-12
CHINA UNIV OF MINING & TECH
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Problems solved by technology

At the same time, the parameter design process of the speed estimator is relatively complicated, and the performance of the estimator is greatly affected by the change of the electrical parameter value.

Method used

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  • A sensorless control method for low-speed synchronous motor based on adaptive filter
  • A sensorless control method for low-speed synchronous motor based on adaptive filter
  • A sensorless control method for low-speed synchronous motor based on adaptive filter

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specific Embodiment

[0039] Such as figure 1 As shown in the block diagram of the permanent magnet synchronous motor sensorless control structure based on pulse vibration high-frequency voltage injection, the speed and position estimation module replaces the traditional photoelectric encoder and position sensor to provide the motor rotor position signal required for motor vector control, and the speed Motor rotor speed signal required for closed-loop control. In sensorless control, the real spatial position of the rotor is unknown, and the angle involved in the rotation transformation is the estimated angle, so each physical quantity is the physical quantity in the estimated two-phase rotating coordinate system with superscript Indicates; the physical quantity in the stationary coordinate system is superscripted (S) Represents; estimated motor rotor position and the estimated speed Given by the speed position estimation module, the rotation factor with Indicates the coordinate transforma...

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Abstract

The invention discloses a sensorless control method in the low-speed section of a synchronous motor based on an adaptive filter, which comprises the following steps: injecting a high-frequency voltage signal on the direct axis of an estimated two-phase rotating coordinate system; The estimated high-frequency current signal in the two-phase rotating coordinate system corresponding to the injected high-frequency voltage frequency is obtained; the estimated two-phase rotating coordinate system high The sine value of the angle between the frequency current vector and the direct axis; use the obtained sine value combined with the phase-locked loop estimation algorithm to calculate the motor speed and rotor position. The passband bandwidth of the filter in the present invention is adjustable, greatly enhances the low-frequency attenuation, effectively filters out the DC component in the high-frequency current signal, solves the problem of DC bias in the high-frequency current, and improves the estimation accuracy; the overall scheme simplifies The signal processing flow and the parameter design process of the speed estimator improve the dynamic performance of the control system.

Description

technical field [0001] The invention relates to a sensorless control method in the low-speed section of a synchronous motor based on an adaptive filter, in particular to a sensorless control method in the low-speed section of a permanent magnet synchronous motor by using an adaptive band-pass filter to extract a high-frequency current signal, combined with a speed position estimation algorithm The control method belongs to the technical field of permanent magnet synchronous motor control. Background technique [0002] Permanent magnet synchronous motor sensorless control refers to the omission of the mechanical sensor to obtain the position information of the motor rotor, while retaining the current sensor that is also required in the torque control. By calculating or observing the electrical quantity containing the rotor position information, it is estimated that the motor rotor The speed and position of the motor, so as to realize the closed-loop control of the motor curre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/18H02P21/32H02P25/022
Inventor 田里思陈昊马小平
Owner CHINA UNIV OF MINING & TECH
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