Position and speed estimation method of permanent magnet synchronous motor based on complex pi controller
A permanent magnet synchronous motor and controller technology, which is applied to control generators, control electromechanical transmissions, control electromechanical brakes, etc., to improve accuracy, avoid phase delay, and eliminate chattering problems.
Active Publication Date: 2021-01-15
包头长安永磁电机有限公司
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[0003] Aiming at the deficiencies of the prior art, the present invention improves the sliding mode observer, aiming at solving the chattering of the sliding mode position observer of the permanent magnet synchronous motor and the phase delay problem caused by the low-pass filter, and improving position and speed estimation precision
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[0023] Below in conjunction with accompanying drawing, technical scheme provided by the present invention is described further:
[0024] figure 1 Embodiment 1 of the traditional technology: The position estimation method and system of the permanent magnet synchronous motor using the complex PI controller described in this embodiment is based on the traditional sliding mode observer, and the switching function and the low-pass filter It is replaced by a complex PI controller to achieve the purpose of eliminating chattering and phase delay.
[0025] figure 2 It is the second implementation mode of traditional technology: this implementation mode is a further description of the first implementation mode, and the following combines Figure 1 to Figure 10 Specific embodiments of the present invention will be described.
[0026] figure 1 It is a block diagram of a positionless vector control system for a permanent magnet synchronous motor based on a sliding mode observer. It c...
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The invention relates to a method for estimating the position and speed of a permanent magnet synchronous motor based on a complex PI controller. The input is the αβ-axis voltage, the estimated value of the αβ-axis back EMF and the estimated value of the rotational speed. After calculating the difference between the observed current value and the detected current value, the estimated back EMF is obtained through the complex PI controller, and then input to the phase-locked loop to obtain Rotor position and speed. Compared with the traditional position sliding mode observer, since the complex PI controller is used to replace the sliding mode control law to achieve zero error control of the estimated current, the chattering problem can be eliminated, and the low-pass filter is omitted to avoid the low-pass filter band The resulting phase delay improves the estimation accuracy of position and velocity.
Description
technical field [0001] The invention relates to a method for estimating the position and speed of a permanent magnet synchronous motor using a complex PI (proportional integral proportional integral) controller, belonging to the field of motor control. Background technique [0002] In the occasions with low cost and high requirements on the sensor environment, the position sensorless control technology is widely used. The position estimation methods of permanent magnet synchronous motors are usually divided into two categories: low-speed estimation methods and medium-high speed estimation methods. The observer observes the motor back EMF or flux linkage related to the rotor angle in real time, and extracts the rotor angle and speed information from it. It is a common method for position and speed estimation in the middle and high speed sections. , adaptive observer, extended Kalman filter, etc. Among them, the sliding mode observer has the advantages of simple structure an...
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IPC IPC(8): H02P21/18
CPCH02P21/18
Inventor 张继鹏安群涛苏锦智
Owner 包头长安永磁电机有限公司