阅读说明：本技术 一种表贴式永磁同步电机转子磁链获取方法 (Method for acquiring rotor flux linkage of surface-mounted permanent magnet synchronous motor ) 是由 洪颖 魏佳丹 安伟 吴仰耘 徐光璐 张萍 陈可 张燕 陈建松 于 2021-05-19 设计创作，主要内容包括：本发明公开了一种基于数据分析的表贴式永磁同步电机转子磁链获取方法,主要由算法初始化、分析计算、循环控制、结果输出等部分组成,通过对电机数据的分析与挖掘,快捷高效地获取电机转子磁链。该方法无需复杂的电路、磁路分析,不依赖于特定的检测仪器,操作简单,执行效率高。(The invention discloses a method for acquiring a rotor flux linkage of a surface-mounted permanent magnet synchronous motor based on data analysis, which mainly comprises the steps of algorithm initialization, analysis and calculation, cycle control, result output and the like. The method does not need complex circuit and magnetic circuit analysis, does not depend on a specific detection instrument, and has simple operation and high execution efficiency.)

1. A method for acquiring a rotor flux linkage of a surface-mounted permanent magnet synchronous motor is characterized by comprising the following steps: the method comprises the following steps:

step 1, setting a plurality of load torque values { TL₁、TL₂、…、TL_NN is the number of load torque values;

step 2, initializing a coefficient k, and enabling k to be 1;

step 3, setting the load torque of the motor as TL_kControlling the rotating speed of the motor to a preset value omega;

step 4, obtaining motor quadrature axis current iq through coordinate transformation after the motor enters a steady state,_k；

step 5, calculating the flux linkage parameter A of the current calculation point_k；

Step 6, judging whether k is more than or equal to N; if yes, entering step 7; if not, making k equal to k +1, and entering step 3;

step 7, calculating the rotor flux linkage psi of the motor_f。

2. The method for acquiring the rotor flux linkage of the surface-mounted permanent magnet synchronous motor according to claim 1, wherein the method comprises the following steps: the flux linkage parameter A in step 5_kThe calculation method is as follows:

wherein, P is the magnetic pole logarithm.

3. The method for acquiring the rotor flux linkage of the surface-mounted permanent magnet synchronous motor according to claim 1, wherein the method comprises the following steps: step 7, the rotor flux linkage psi_fThe calculation method is as follows:

Technical Field

The invention relates to the technical field of motor control and power electronics, in particular to a method for acquiring a rotor flux linkage of a surface-mounted permanent magnet synchronous motor.

Background

The surface-mounted permanent magnet synchronous motor has the advantages of simple control, high power density, high operating efficiency, high response speed and the like, is widely applied to the fields of industrial automation, transportation, instruments and meters and the like, and plays a great role in national economy and social production. The surface-mounted permanent magnet synchronous motor mainly comprises a circuit, a magnetic circuit, mechanical parts and the like, and each link relates to different motor parameters. Among these, rotor flux linkage is an important parameter. No matter the performance of the motor body is optimized or the operation control scheme is perfect, the rotor flux linkage needs to be accurately acquired. The parameter is typically calibrated by the manufacturer at the time of shipment, and is typically a value typical of a standard prototype. The actual parameters may deviate due to factors such as manufacturing processes, motor materials, etc. In addition, along with the change of operating conditions such as temperature, humidity, etc., the rotor flux linkage also changes.

The rotor flux linkage is obtained mainly by an analytical method, a measurement method, and the like. The former adopts means such as finite element analysis, electromagnetic field simulation and the like to comprehensively analyze a motor body according to an internal mechanism of the motor so as to obtain a rotor flux linkage; the latter measures the parameters by detecting the circuit and magnetic circuit of the motor through specific instruments according to the external characteristics of the motor and applying a certain excitation quantity if necessary. For the analytical method, the design of a motor body and the theory of electromagnetism are involved, so that the speciality is strong, and complete design data of the motor needs to be acquired; the measurement method is dependent on a specific detection instrument and has certain limitations.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention provides a method for acquiring the rotor flux linkage of the surface-mounted permanent magnet synchronous motor based on data analysis, so that the method has the advantages of strong operability and wide application range.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows:

a method for acquiring a surface-mounted permanent magnet synchronous motor rotor flux linkage comprises the following steps:

step 1, setting a plurality of load torque values { TL₁、TL₂、…、TL_NN is the number of load torque values;

step 2, initializing a coefficient k, and enabling k to be 1;

step 3, setting the load torque of the motor as TL_kControlling the rotating speed of the motor to a preset value omega;

step 4, obtaining motor quadrature axis current iq through coordinate transformation after the motor enters a steady state,_k；

step 5, calculating the flux linkage parameter A of the current calculation point_kAs shown in formula 1;

in the formula, P is the number of magnetic pole pairs;

step 6, judging whether k is more than or equal to N; if yes, entering step 7; if not, making k equal to k +1, and entering step 3;

step 7, calculating the rotor flux linkage psi of the motor_fAs shown in formula 2;

according to the method for acquiring the parameters of the permanent magnet synchronous motor based on the operation data, complicated electromagnetic analysis is not needed, a specific detection instrument is not relied on, the difficulty in acquiring the parameters is reduced, and the operability is improved.

Drawings

Fig. 1 is a logic block diagram of a method for acquiring a rotor flux linkage of a surface-mounted permanent magnet synchronous motor based on data analysis.

Detailed Description

The present invention will be further described with reference to the accompanying drawings.

Referring to fig. 1, the application method of the present invention includes the following steps, wherein steps 1 to 2 are parameter setting and initialization, steps 3 to 5 are analysis and calculation, step 6 is loop control, and step 7 is result output.

Step 1, setting a plurality of load torque values { TL₁、TL₂、…、TL_NN is the number of load torque values;

step 2, initializing a coefficient k, and enabling k to be 1;

step 3, setting the load torque of the motor as TL_kControlling the rotating speed of the motor to a preset value omega;

step 4, obtaining motor quadrature axis current iq through coordinate transformation after the motor enters a steady state,_k；

step 5, calculating the flux linkage parameter A of the current calculation point_kAs shown in formula 1;

in the formula, P is the number of magnetic pole pairs;

step 6, judging whether k is more than or equal to N; if yes, entering step 7; if not, making k equal to k +1, and entering step 3;

step 7, calculating the rotor flux linkage psi of the motor_fAs shown in formula 2;

the above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.