Control method of self-starting permanent magnet synchronous motor

[0055] Example 1:

[0056] An embodiment of the present invention provides a control method for a self-starting permanent magnet synchronous motor, comprising the following steps:

[0057] Enter the required torque value, and measure the stator current and rotor speed of the motor;

[0058] Obtain the real-time stator flux state quantity and the real-time rotor flux state quantity through the flux linkage measurer;

[0059] Change the state quantities of the real-time stator flux linkage and the real-time rotor flux linkage according to the required torque value, and control the movement directions of the real-time stator flux linkage and the real-time rotor flux linkage;

[0060] Change the inclination of real-time stator flux linkage and real-time rotor flux linkage, obtain the modified parameters of the inclination angle, and control the torque of the motor.

[0061] The working principle of the above technical solution is as follows:

[0062]In the prior art of the present invention, the relationship between the flux linkage and the torque is studied in a relatively static coordinate system mainly by establishing a mathematical model, the corresponding relationship is found, and the torque value is changed to realize the control of the permanent magnet synchronous motor. The present invention First obtain the required torque value, measure the stator current and rotor speed of the motor, obtain the real-time stator flux linkage state quantity and the real-time rotor flux linkage state quantity, and change the real-time stator flux linkage and real-time rotor flux linkage according to the required torque value. The state quantity of the flux linkage controls the movement direction of the real-time stator flux linkage and the real-time rotor flux linkage, changes the inclination angle of the real-time stator flux linkage and the real-time rotor flux linkage, obtains the modification parameters of the inclination angle, and controls the torque of the motor.

[0063] The beneficial effects of the above technical solutions are as follows: the present invention first identifies the required torque value, and all control methods are carried out on the premise of obtaining the required torque value, and by analyzing the state quantity of the real-time rotor flux linkage, the motion of the flux linkage is obtained. The influence parameters of the direction are adjusted, and the motor torque is then controlled. The control method of the present invention has a simple structure, a relatively small amount of calculation, and does not need to establish a mathematical model, and is suitable for various machines.

[0064] Example 2:

[0065] In an embodiment of the present invention: the inputting the required torque value, and measuring the real-time stator current and real-time rotor speed of the motor, including:

[0066] Determine the stator position signal of the motor through signal detection, and perform current detection on the stator position to obtain the stator current;

[0067] The stator current is transmitted to a filter for signal filtering, and then input to an A/D conversion circuit for signal conversion to obtain a current digital signal;

[0068] The rotational speed of the rotor is obtained by a tachometer.

[0069] The working principle of the above technical solution is as follows:

[0070] In the prior art of the present invention, the stator position is calculated by a control algorithm, but the accuracy of this algorithm is not enough, and the calculated value is often deviated. The present invention determines the stator position signal of the motor through signal detection, and performs current detection on the stator position, And obtain the stator current, transmit the stator current to the filter for signal filtering, and then input it to the A/D conversion circuit for signal conversion, obtain the current digital signal, and perform signal detection on the current digital signal to ensure the current digital signal of the motor. meet the motor requirements.

[0071] The beneficial effects of the above technical solutions are as follows: the present invention obtains the stator current by determining the stator position, processes the stator current to obtain the current digital signal, detects the current digital signal, filters the signal that does not meet the requirements of the motor, and eliminates the common mode current signal, To further protect the normal operation of the motor.

[0072] Example 3:

[0073] In an embodiment of the present invention, the obtaining of the real-time stator flux linkage state quantity and the real-time rotor flux linkage state quantity through the flux linkage measurer includes:

[0074] Obtain the amplitude and phase of real-time stator flux linkage through the measurement result of the flux linkage measurer;

[0075] Obtain the amplitude and phase of real-time rotor flux linkage through the measurement result of the flux linkage measurer;

[0076] According to the amplitude and phase of the real-time stator flux linkage and the real-time rotor flux linkage, the state parameters of the stator flux linkage and the rotor flux linkage are extracted.

[0077] The working principle of the above technical solution is as follows:

[0078] In the prior art of the present invention, in the relative static coordinate system of the mathematical model, the stator flux linkage and rotor flux linkage coordinate system are established, and the amplitude and phase of the connection between the rotor and the stator are obtained in the coordinate system, but the process is complicated. , requires quantitative analysis, in the present invention, through the flux linkage measurer, in the flux linkage detector, the stator flux linkage and rotor flux linkage can be quickly analyzed, the state parameters of the two flux linkages can be obtained, and further calculations can be performed.

[0079] The beneficial effects of the above technical solutions are: in the present invention, instead of using a complex mathematical model to quantitatively analyze the state parameters of the stator flux linkage and rotor flux linkage in the coordinate system, a flux linkage detector is used to measure the stator flux linkage. It can quickly extract the state parameters of the rotor flux linkage, and obtain the state parameters more quickly and without errors.