Control method and control system based on synchronous reluctance motor

Abstract

The control method and control system based on a synchronous reluctance motor solve the problem of relatively complex calculation of the voltage-current vector angle with respect to the motor speed in the new type vector control of the synchronous reluctance motor, and belong to the field of automatic control of electric drive. The method for determining the functional relationship between the voltage-current vector angle and the motor speed is given, the method for changing the input voltage vector angle reference value is added to the original control structure, a plurality of experiments are conducted, and an accurate functional relationship is obtained by fitting, the original control circuit is effectively utilized, and the influence of the current change on the saturation degree of the magnetic circuit is considered in the data used for fitting, so that the influence of the magnetic circuit saturation on the calculation of the functional relationship by using the motor inductance and other parameters is avoided in principle. The method increases the operability of the vector control method, reduces the complexity of the control, improves the control accuracy and reliability, and widens the application market of the vector control.

Description

Technical Field

[0001] The invention relates to a control method and a control system based on a synchronous reluctance motor, and belongs to the field of electric drive automatic control. Background Art

[0002] With the rapid growth and development of various industrial sectors, people are becoming increasingly dependent on motors, and their demands are becoming increasingly sophisticated. In this era of rapid development, upgrading traditional motors has gradually become a factor that many entrepreneurs must consider in pursuit of high-quality industrial development. In some relatively harsh application environments, motor reliability and control stability directly determine production progress and are directly linked to corporate profits. Synchronous reluctance motors are simple and low-cost motors. Their rotors lack windings and permanent magnets. Their structure and operating principle avoid the risk of motor demagnetization in harsh applications such as high temperatures. They are also easy to manufacture, and as a result, have garnered widespread attention in recent years. The traditional speed control method for synchronous reluctance motors is vector control, which employs dual closed-loop control of speed and current. This control method requires real-time decoupling of the motor current and requires a current loop controller for each of the two orthogonal axis current components. Considering the speed loop controller for speed control, the number of controllers required is at least three, which presents challenges in tuning the controller parameters. Therefore, scholars and engineers from all walks of life are constantly exploring simpler control methods for synchronous reluctance motors.

[0003] To address the conflict between reliability and simplicity in traditional control methods for synchronous reluctance motors (SRMs), researchers have proposed a novel vector control method based on synchronous switched reluctance motors (SSMs). Since SRMs and SSMs share the same operating principles, this method is equally applicable to SRMs. This method implements an outer speed control loop and an inner current vector amplitude control loop based on the functional relationship between the angle between the voltage and current vectors and the motor speed. Because the inner loop controls the motor current amplitude rather than the quadrature and direct axis components, the number of inner loop controllers is reduced compared to traditional vector control, resulting in a simpler control structure. Experimental verification demonstrates stable speed regulation and reliable control. However, the formula for calculating the voltage and current vector angle with respect to motor speed is relatively complex and depends on parameters such as the SRM's direct-axis inductance, quadrature-axis inductance, and winding resistance. Measuring these parameters requires additional measurement circuitry, and the results are susceptible to environmental constraints and instrument accuracy. This complexity undoubtedly limits the practical application of this control method. Summary of the Invention

[0004] In view of the relatively complex problem of obtaining the voltage and current vector angle with respect to the motor speed in the new vector control of a synchronous reluctance motor, the present invention provides a control method and control system based on a synchronous reluctance motor.

[0005] A control method based on a synchronous reluctance motor of the present invention includes:

[0006] According to the current vector amplitude i collected by the synchronous reluctance motor s and motor speed n, and obtain the reference value u of the voltage vector amplitude ief ;

[0007] According to the motor speed n, combined with the functional relationship between the angle between the voltage vector and the current vector and the motor speed, the reference value of the voltage vector angle θ is obtained. u ;

[0008] According to the reference value u of the voltage vector amplitude ief , reference value of voltage vector angle θ u Perform modulation and use the modulation signal to control the synchronous reluctance motor through the inverter circuit;

[0009] The method for determining the functional relationship between the angle between the voltage vector and the current vector and the motor speed is:

[0010] In the maximum torque current ratio control mode, increase the motor speed reference value n multiple times * The value of each motor speed is obtained by * Lower current vector magnitude i s The minimum obtained And the motor electrical angular velocity ω, the voltage and current vector angle of the multiple sets of synchronous reluctance motors is obtained Fitting is performed with the motor electrical angular velocity ω to determine the unknown parameters in the functional relationship between the angle between the voltage vector and the current vector and the motor speed.

[0011] Preferably, a method for determining a functional relationship between the angle between the voltage vector and the current vector and the motor speed includes:

[0012] S1. Determine the motor speed given value n * Angle between voltage and current vector The initial value of

[0013] S2, set the motor speed to the given value n * Angle with voltage and current vector The synchronous reluctance motor is controlled as a given input to obtain the motor electrical angular velocity ω and record the current vector amplitude i s ;

[0014] S3. Increase the voltage and current vector angle The value of the motor electrical angular velocity ω and the current vector amplitude i after stabilization are recorded at the same time. s ;

[0015] S4. Determine the current vector amplitude i s Is it decreasing? If so, go to S3. If not, record the minimum current vector amplitude i s The corresponding voltage and current vector angle

[0016] S5, increase the motor speed set value n * , set the voltage and current vector angle , execute step 2 until the minimum current vector amplitude i under multiple groups of different motor electrical angular velocities ω is obtained. s The corresponding voltage and current vector angle Transfer to S6;

[0017] S6, based on the obtained multiple groups of motor electrical angular velocities ω and the corresponding voltage and current vector angles By fitting, the unknown parameters of the functional relationship between the angle between the voltage vector and the current vector and the motor speed are determined, and then the functional relationship between the angle between the voltage vector and the current vector and the motor speed is determined.

[0018] Preferably, the functional relationship between the angle between the voltage vector and the current vector and the motor speed is:

[0019]

[0020] Wherein, K1, K2, K3 are fitting parameters, and ω = (2πn / 60).

[0021] Preferably, the current angle γ of the synchronous reluctance motor is 45°.

[0022] As a preference, according to the current vector amplitude i of the synchronous reluctance motor s and motor speed n, and obtain the reference value u of the voltage vector amplitude ief The methods include:

[0023] Speed ​​set value n * The reference value i of the current vector amplitude is obtained by subtracting the motor speed n collected by the speed sensor through the speed outer loop controller. ief , the reference value i ief The current vector amplitude i measured by the current sensor s The voltage vector amplitude reference value u is obtained by making a difference through the current vector amplitude inner loop controller ief .

[0024] As a preferred method, the three-phase current of the motor measured by the sensor is transformed by 3 / 2 to obtain a current vector, and the norm of the current vector is calculated to obtain the current vector amplitude i s .

[0025] The present application also provides a control system based on a synchronous reluctance motor, comprising an outer loop controller, an inner loop controller and a controller, an inverter circuit, a voltage vector angle calculator, and a given input module;

[0026] Speed ​​set value n * The reference value i of the current vector amplitude is obtained by subtracting the motor speed n collected by the speed sensor through the speed outer loop controller. ief , the reference value i ief The current vector amplitude i measured by the current sensor s The voltage vector amplitude reference value u is obtained by making a difference through the current vector amplitude inner loop controller ief , and input to the controller;

[0027] The voltage vector angle calculator is used to obtain the reference value θ of the voltage vector angle based on the motor speed n collected by the speed sensor and the functional relationship between the angle between the voltage vector and the current vector and the motor speed. u , and input to the controller;

[0028] Controller for the reference value u of the voltage vector magnitude ief , reference value of voltage vector angle θ u , after modulation, the synchronous reluctance motor is controlled by driving the inverter circuit;

[0029] Among them, the functional relationship between the angle between the voltage vector and the current vector and the motor speed is that in the maximum torque current ratio control mode, the motor speed given value n is increased multiple times. * And through the given input module input collected motor speed n and multiple increase voltage and current vector angle The value of the voltage vector angle is changed to achieve the reference value θ u , get the given value n of each motor speed * The current vector amplitude i of the synchronous reluctance motor s The voltage and current vector angle obtained when it is minimum and the motor electrical angular velocity ω, the obtained multiple sets of voltage and current vector angles Fitting is performed with the motor electrical angular velocity ω to determine the unknown parameters in the functional relationship between the angle between the voltage vector and the current vector and the motor speed.

[0030] The present invention offers the following beneficial effects: It eliminates the need for additional circuitry for measuring motor inductance and winding resistance, remaining true to the existing control circuitry to determine the functional relationship between the angle between the voltage and current vectors and the motor speed. The control system boasts a simple structure, convenient operation, and high measurement accuracy, leveraging the advantages of a novel vector control method. This further broadens the application market for synchronous reluctance motors or synchronous switched reluctance motors, providing a robust approach to selecting drive motors and control strategies for modern industrial control. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is the original schematic diagram of the control method based on the synchronous reluctance motor of the present invention;

[0032] Figure 2 Schematic diagram of the current vector terminal trajectory of the control method based on the synchronous reluctance motor of the present invention;

[0033] Figure 3 It is a flowchart of the implementation procedure of the control method based on the synchronous reluctance motor of the present invention. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0035] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0036] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0037] This embodiment is based on the principle of the control method of the synchronous reluctance motor. The hardware and software aspects of this embodiment are introduced. In terms of hardware, a three-phase bridge inverter circuit is used as the driver of the synchronous reluctance motor. A DSP control chip is used to implement programming control of the inverter output.

[0038] In terms of software, its control structure includes speed outer loop control and current vector amplitude inner loop control. The specific control process includes: speed given value n * The reference value i of the current vector amplitude is obtained by subtracting the motor speed n collected by the speed sensor through the speed outer loop controller. ief , the reference value i ief The current vector amplitude i measured by the current sensor in real time sThe voltage vector amplitude reference value u is obtained by making a difference through the current vector amplitude inner loop controller ief , where the current vector magnitude i s It is calculated by the norm of the current vector obtained by 3 / 2 transformation of the three-phase current of the motor measured by the sensor.

[0039] Reference value u of voltage vector amplitude ief As one input of the space vector pulse width modulation technology, that is, the SVPWM controller, the other input of the SVPWM controller is the voltage vector angle reference value θ calculated by the formula u .

[0040] Reference value u of voltage vector amplitude ief and the voltage vector angle reference value θ u To form a voltage vector, the SVPWM controller decomposes the input voltage vector (including amplitude information and angle information) into α-axis components and β-axis components, and then uses the volt-second balance principle to calculate the on-off sequence of each power switch device in the inverter circuit required to synthesize the reference voltage vector, and then outputs a three-phase voltage to achieve the speed control of the synchronous reluctance motor. Since the current vector can only be positive, the u output by the speed outer loop controller is ief It needs to be processed by absolute value, which contradicts the control requirement that the motor should be able to achieve forward and reverse rotation, acceleration and deceleration. To resolve this contradiction, this method chooses to monitor the motor speed and the positive and negative output value of the outer loop controller before absolute value processing in real time. At the same time, the functional relationship between the angle between the voltage vector and the current vector and the motor speed is combined to calculate the reference value θ of the voltage vector angle required for different motor operating states (forward uniform speed, forward acceleration, forward deceleration, reverse uniform speed, reverse acceleration, reverse deceleration) u , the reference value θ u It is the sum of the voltage and current vector angle, the motor electrical angle, and the current angle. The motor electrical angle can be obtained by a speed sensor or a position sensor. The current angle can generally be simplified to a constant of 45 degrees in the maximum torque current ratio (MTPA) control mode. Therefore, the reference value of the voltage vector angle θ is u Together with the voltage vector amplitude reference value output by the inner loop controller, the SVPWM controller controls the speed of the synchronous reluctance motor. The core of this control method is to determine the reference value of the voltage vector angle corresponding to the current speed by using the functional relationship between the angle between the voltage vector and the current vector and the motor speed. The functional relationship between the angle between the voltage vector and the current vector and the motor electrical angle under the maximum torque-to-current ratio control mode proposed by this control method is as follows:

[0041]

[0042] in, is the angle between the voltage vector and the current vector, ω is the motor electrical angular velocity, L d is the motor direct axis inductance, L q is the motor quadrature-axis inductance, R s is the motor phase winding resistance. As can be seen from formula (1), the functional relationship The determination depends on the motor direct axis inductance L d , motor quadrature-axis inductance L q , motor phase winding resistance R s The determination of these three quantities depends on professional measuring circuits and measuring instruments, and the measurement accuracy is difficult to guarantee. In addition, the quadrature and direct axis inductances of the motor are also susceptible to the saturation of the motor magnetic circuit. Therefore, a small deviation may have an amplifying effect after the calculation of formula (1), thus affecting The accuracy of the value will affect the reliability of the control. To solve this problem, this embodiment provides a control method.

[0043] In order to obtain the functional relationship between the angle between the voltage vector and the current vector and the motor speed under the maximum torque current ratio control mode, the hardware level still uses the original inverter circuit to drive the synchronous reluctance motor; the software level adds the input mode of the voltage vector angle reference value on the basis of the original control structure. The specific control structure is as follows Figure 1 The switch can be switched to input mode to conduct an experiment to establish the functional relationship between the angle between the voltage and current vectors and the motor speed. After the experiment is completed and data is obtained, the switch can be switched to voltage vector angle calculator mode to apply the previously obtained specific functional relationship to control the synchronous reluctance motor using the novel vector control method. The core of the present invention, namely, the experimental principle and steps for establishing the functional relationship between the angle between the voltage and current vectors and the motor speed, are described in detail below.

[0044] The motor motion equation is:

[0045]

[0046] Where J is the motor moment of inertia, ω m is the mechanical angular velocity, and its pole pair number n p times the electrical angular velocity ω, T e is the electromagnetic torque, T L is the load torque, and D is the torque damping coefficient. When the motor speed is constant, the motor mechanical angular acceleration is 0, so formula (2) can be rewritten as:

[0047]

[0048] When the load torque is constant, the electromagnetic torque remains unchanged. The torque formula of the synchronous reluctance motor is:

[0049]

[0050] Among them, i d is the direct axis current, i q is the quadrature axis current, and γ is the current angle. From formula (4), we can see that the quadrature and direct axis currents of the motor are inversely proportional. When the current angle γ is 45°, the current vector amplitude i s Minimum.

[0051] In summary, when the load torque is constant, for the same motor electrical angular velocity ω, the end of the motor current vector will slide along the inverse proportional function curve, and the current vector amplitude has a minimum value when the quadrature and direct axis currents are equal, as shown in Figure 2 At this time, the current angle is 45°, which meets the maximum torque current ratio condition. So according to this principle, the voltage and current vector angle is determined. The method of functional relationship between the electrical angular velocity ω and the motor.

[0052] The specific control process of the method of the present invention is as follows Figure 3 , including the following steps:

[0053] Step 1: Determine the motor speed reference value n * The initial value (small), the voltage and current vector angle The initial value of (small);

[0054] Step 2: Set the motor speed reference value n * Angle with voltage and current vector As a given input to the motor control system, the motor rotates under double closed-loop control, the motor electrical angular velocity ω is obtained, and the motor current vector amplitude i is recorded at the same time. s ;

[0055] Step 3: Increase the voltage and current vector angle To change the voltage vector angle reference value, and record the motor current vector amplitude i after stabilization s ;

[0056] Step 4: Repeat step 3, the current vector magnitude i s Gradually decreases until the current vector amplitude i s Increase again and record the minimum current vector amplitude i s The corresponding voltage and current vector angle

[0057] Step 5: Increase the motor speed reference value n * And re-take a smaller voltage and current vector angle Then execute step 2 until the minimum current vector amplitude i under multiple groups of different motor electrical angular velocities ω is obtained. s The corresponding voltage and current vector angle

[0058] Step 6: Apply the multiple motor electrical angular velocities ω obtained in step 5 and the corresponding voltage and current vector angles The data and formula (1) are used to calculate the fitting result of formula (1) through the fitting algorithm of digital simulation software:

[0059]

[0060] Where K1, K2, and K3 are fitting parameters, and ω = (2πn / 60). Formula (5) is the functional relationship between the angle between the voltage vector and the current vector and the motor speed n under the maximum torque current ratio control mode.

[0061] The control method of this embodiment can also be fully implemented in hardware. The control system based on the synchronous reluctance motor includes an outer loop controller, an inner loop controller and an SVPWM controller, an inverter circuit, a voltage vector angle calculator and a given input module.

[0062] Speed ​​set value n * The reference value i of the current vector amplitude is obtained by subtracting the motor speed n collected by the speed sensor through the speed outer loop controller. ief , the reference value i ief The current vector amplitude i measured by the current sensor s The voltage vector amplitude reference value u is obtained by making a difference through the current vector amplitude inner loop controller ief , and input to the SVPWM controller;

[0063] The voltage vector angle calculator is used to obtain the reference value θ of the voltage vector angle based on the motor speed n collected by the speed sensor and the functional relationship between the angle between the voltage vector and the current vector and the motor speed. u , and input to the SVPWM controller;

[0064] SVPWM controller, used to calculate the voltage vector magnitude based on the reference value u ief , reference value of voltage vector angle θ u , after modulation, the synchronous reluctance motor is controlled by driving the inverter circuit;

[0065] Among them, the functional relationship between the angle between the voltage vector and the current vector in the voltage vector angle calculator and the motor speed has been determined. It is in the maximum torque current ratio control mode, and the motor speed given value n is increased multiple times by the given input module. * , get the given value n of each motor speed * The current vector amplitude i of the synchronous reluctance motor sThe voltage and current vector angle obtained when it is minimum and the motor electrical angular velocity ω, the obtained multiple sets of voltage and current vector angles Fitting with the motor electrical angular velocity ω determines the unknown parameters in the functional relationship between the angle between the voltage vector and the current vector and the motor speed. The functional relationship between the angle between the voltage vector and the current vector and the motor speed is:

[0066]

[0067] Among them, K1, K2, and K3 are fitting parameters.

[0068] This embodiment adds a given input module for the voltage vector angle reference value on the basis of the original control structure, and sets a conversion switch to switch to the given input mode to conduct an experiment to establish the functional relationship between the angle between the voltage vector and the current vector and the motor speed. After completing the experiment and obtaining the data, the mode can be switched to the voltage vector angle calculator mode to apply the specific functional relationship obtained in the early stage to complete the control of the synchronous reluctance motor.

[0069] The control method and control system of this embodiment are also applicable to synchronous switched reluctance motors. Both synchronous switched reluctance motors and synchronous switched reluctance motors are synchronous motors. Both operate according to the principle of minimum magnetic resistance. The only difference between the motor bodies is the rotor structure. The rotor structure of the latter is more robust and also has good application prospects.

[0070] The digital simulation software required for the control method and control system of this embodiment can adopt the common software MATLAB, or can be implemented in an integrated development environment through programming languages ​​such as Python, and the selection of fitting methods has a certain degree of flexibility;

[0071] The process for determining the functional relationship between the angle between the voltage and current vectors and the motor speed, as described in the control method and control system of this embodiment, takes into account variations in current amplitude. Specifically, the current vector amplitude required to achieve the maximum torque-to-current ratio varies at different motor speeds. Therefore, the results obtained from fitting experimental data account for the impact of current variations on the degree of magnetic field saturation in the synchronous reluctance motor. As a result, the voltage vector angle reference value calculated using the fitting results obtained by this method is closer to the ideal voltage vector angle value that achieves the maximum torque-to-current ratio under different motor operating conditions. This result, combined with the novel vector control method, allows for more accurate and reliable motor control.

[0072] Although the present invention is described herein with reference to specific embodiments, it should be understood that these embodiments are merely illustrative of the principles and applications of the invention. It should be understood that many modifications may be made to the illustrative embodiments, and that other arrangements may be devised, without departing from the spirit and scope of the invention as defined by the appended claims. It should be understood that the various dependent claims and features described herein may be combined in ways other than those described in the original claims. It should also be understood that features described in conjunction with individual embodiments may be employed in conjunction with other described embodiments.

Claims

1. A control method based on a synchronous reluctance motor, characterized in that: The control method includes: According to the current vector amplitude collected from the synchronous reluctance motor and motor speed , get the reference value of the voltage vector amplitude ; According to the motor speed , combined with the functional relationship between the angle between the voltage vector and the current vector and the motor speed, the reference value of the voltage vector angle is obtained ; According to the reference value of the voltage vector amplitude , reference value of voltage vector angle Perform modulation and use the modulation signal to control the synchronous reluctance motor through the inverter circuit; Methods for determining the functional relationship between the angle between the voltage vector and the current vector and the motor speed include: S1. Determine the motor speed setting value Angle between voltage and current vector The initial value of S2, set the motor speed to a given value Angle with voltage and current vector The synchronous reluctance motor is controlled as a given input to obtain the motor's electrical angular velocity , while recording the current vector amplitude ; S3. Increase the voltage and current vector angle The value of the motor electrical angular velocity after stabilization is recorded. , current vector amplitude ; S4. Determine the current vector amplitude Is it decreasing? If so, go to S3. If not, record the minimum current vector amplitude. The corresponding voltage and current vector angle ; S5, increase the motor speed set value n * , set the voltage and current vector angle Initial value, execute step 2 until multiple sets of different motor electrical angular velocities are obtained Minimum current vector magnitude The corresponding voltage and current vector angle , transfer to S6; S6, based on the obtained multiple groups of motor electrical angular velocities The angle between the corresponding voltage and current vectors By fitting, the unknown parameters of the functional relationship between the angle between the voltage vector and the current vector and the motor speed are determined, and then the functional relationship between the angle between the voltage vector and the current vector and the motor speed is determined.

2. The control method based on the synchronous reluctance motor according to claim 1, characterized in that: The functional relationship between the angle between the voltage vector and the current vector and the motor speed is: in, 、 、 are the fitting parameters, .

3. The control method based on the synchronous reluctance motor according to claim 1, characterized in that: Current angle of synchronous reluctance motor is 45°.

4. The control method based on the synchronous reluctance motor according to claim 1, characterized in that: According to the current vector amplitude of the synchronous reluctance motor and motor speed , get the reference value of the voltage vector amplitude The methods include: Speed ​​setpoint The motor speed collected by the speed sensor The reference value of the current vector amplitude is obtained by making a difference through the speed outer loop controller , the reference value The current vector magnitude measured by the current sensor The voltage vector amplitude reference value is obtained by making a difference through the current vector amplitude inner loop controller .

5. The control method based on the synchronous reluctance motor according to claim 1, characterized in that: The three-phase current of the motor measured by the sensor is transformed by 3 / 2 to obtain the current vector, and the norm of the current vector is calculated to obtain the current vector amplitude. .

6. A control system based on a synchronous reluctance motor, characterized in that: It includes outer loop controller, inner loop controller and controller, inverter circuit, voltage vector angle calculator and given input module; Speed ​​setpoint The motor speed collected by the speed sensor The reference value of the current vector amplitude is obtained by making a difference through the outer loop controller , the reference value The current vector magnitude measured by the current sensor The reference value of the voltage vector amplitude is obtained by the inner loop controller , and input to the controller; Voltage vector angle calculator, used to calculate the motor speed according to the speed sensor Combining the functional relationship between the angle between the voltage vector and the current vector and the motor speed, the reference value of the voltage vector angle is obtained. , and input to the controller; Controller for reference value of voltage vector magnitude , reference value of voltage vector angle , after modulation, the synchronous reluctance motor is controlled by driving the inverter circuit; The method for determining the functional relationship between the angle between the voltage vector and the current vector and the motor speed includes: S1. Determine the motor speed setting value Angle between voltage and current vector The initial value of S2, set the motor speed to a given value Angle with voltage and current vector The synchronous reluctance motor is controlled as a given input to obtain the motor's electrical angular velocity , while recording the current vector amplitude ; S3. Increase the voltage and current vector angle The value of the motor electrical angular velocity after stabilization is recorded. , current vector amplitude ; S4. Determine the current vector amplitude Is it decreasing? If so, go to S3. If not, record the minimum current vector amplitude. The corresponding voltage and current vector angle ; S5. Increase the motor speed setting value through the given input module , set the voltage and current vector angle Initial value, execute step 2 until multiple sets of different motor electrical angular velocities are obtained Minimum current vector magnitude The corresponding voltage and current vector angle , transfer to S6; S6, based on the obtained multiple groups of motor electrical angular velocities The angle between the corresponding voltage and current vectors By fitting, the unknown parameters of the functional relationship between the angle between the voltage vector and the current vector and the motor speed are determined, and then the functional relationship between the angle between the voltage vector and the current vector and the motor speed is determined.

7. The control system based on the synchronous reluctance motor according to claim 6, characterized in that: The functional relationship between the angle between the voltage vector and the current vector and the motor speed is: in, 、 、 are the fitting parameters.

8. The control system based on the synchronous reluctance motor according to claim 6, characterized in that: The current angle of the synchronous reluctance motor is 45°.

9. The control system based on the synchronous reluctance motor according to claim 6, characterized in that: The controller is an SVPWM controller.

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