A Sensorless Control Method of Permanent Magnet Synchronous Motor Based on High Frequency Signal Injection
A permanent magnet synchronous motor, high-frequency signal technology, used in motor control, motor generator control, electronic commutation motor control, etc. The effect of improving estimation accuracy and eliminating time delay
Active Publication Date: 2021-06-04
NORTHEASTERN UNIV LIAONING
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Problems solved by technology
[0006] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art such as low estimation accuracy, long-term existence, and slow dynamic response speed, and provide a sensorless control method for permanent magnet synchronous motors based on high-frequency signal injection. The calculation can effectively overcome the shortcomings of the traditional rotor position estimation method. Using the compensation matrix method, the analytical expression of the rotor position can be directly obtained, which can eliminate the time delay problem existing in the prior art due to the use of low-pass filters and band-pass filters, and effectively estimate the rotor position. Location
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[0063] In order to realize the sensorless control in the full speed range including zero / low speed, the present invention proposes to apply the high-frequency signal injection method to the permanent magnet synchronous motor control system, and realize the rotor position through the detected parameters such as motor voltage and current. Accurate estimation eliminates the time delay problem existing in the prior art due to the use of low-pass filters and band-pass filters, and improves estimation accuracy and dynamic response speed.
[0064] Such as figure 1 Shown is the block diagram of the permanent magnet synchronous motor sensorless control system in the specific implementation process of the present invention, and the sensorless control system is divided into the following main parts:
[0065] (1) High-frequency signal injection part
[0066] The high-frequency signal generator continuously injects high-frequency signal u into the system αβin To obtain the salient pole i...
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A sensorless control method of a permanent magnet synchronous motor based on high-frequency signal injection of the present invention comprises the following steps: Step 1: Establishing the fundamental wave mathematical model of the permanent magnet synchronous motor under the two-phase stationary coordinate system and under the excitation of the high-frequency voltage signal The high-frequency excitation mathematical model; Step 2: Inject the high-frequency voltage excitation signal in the two-phase stationary coordinate system, sample according to the high-frequency excitation mathematical model, obtain the current item containing the rotor position information, and then obtain the display expression of the rotor position ; Step 3: Send the estimated rotor position to the speed controller and current controller to form a speed-current double-closed-loop control structure and generate control signals. The invention can overcome the shortcomings of the traditional rotor position estimation method, adopt the compensation matrix method, directly obtain the analytical expression of the rotor position, eliminate the time delay problem existing in the prior art due to the use of low-pass filters and band-pass filters, and effectively estimate the rotor position Location.
Description
technical field [0001] The invention belongs to the field of permanent magnet synchronous motor control, and relates to a sensorless control method for permanent magnet synchronous motors based on high-frequency signal injection. Background technique [0002] The permanent magnet synchronous motor speed control system has the advantages of fast dynamic response, strong overload capacity and good stability, and is suitable for various load operating conditions. The rotor of permanent magnet synchronous motor is made of permanent magnet material. It has high power density, small volume and weight, and flexible design of external dimensions. It is widely used in various fields of national production and life. Electric energy is the main secondary energy for national production and life. Motors are the main body of electromechanical energy conversion and electric energy consumption. In 2013, the Ministry of Industry and Information Technology issued the "Motor Energy Efficiency...
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IPC IPC(8): H02P21/24H02P21/18H02P6/18
CPCH02P6/18H02P2207/05H02P21/18H02P21/24
Inventor 王大志李汶浍孔德善王海洋周迎宾
Owner NORTHEASTERN UNIV LIAONING