A method, system, terminal and medium for suppressing induced voltage pulsation of excitation winding

Abstract

The present invention discloses a method, system, terminal and medium for suppressing induced voltage pulsation of an excitation winding. The method comprises: selecting a preferred pole-slot match of a target motor, and globally optimizing several parameter setting schemes of the target motor using the preferred pole-slot match based on a genetic algorithm, and determining the optimal parameter setting scheme of the target motor using the preferred pole-slot match, wherein the preferred pole-slot match is used to reflect the preferred number of rotor poles matched with the target motor; analyzing the electromagnetic performance of the target motor using the preferred pole-slot match under different working conditions, and obtaining the induced electromotive force information of the excitation winding under different working conditions; determining the optimal pole-slot match based on the induced electromotive force information of the excitation winding, and controlling the target motor to use the optimal pole-slot match, suppressing the induced voltage pulsation of the excitation winding, so as to optimize the target motor. The present invention can maximally weaken the induced voltage pulsation of the excitation winding by adjusting the pole-slot match, and effectively improve the stability of the motor.

Description

Technical Field

[0001] The present invention relates to the technical field of motor optimization, and in particular to a method, system, terminal and medium for suppressing induced voltage pulsation of an excitation winding. Background Art

[0002] Rare earth permanent magnet motors (PMM) have been widely developed and applied in various industrial fields due to their high torque density and efficiency. However, rare earth materials are expensive and in short supply, and rare earth permanent magnet motors face great challenges in low-cost applications. In addition, permanent magnet motors have defects such as poor weak magnetic properties, limited operating temperature range, and irreversible demagnetization of permanent magnet materials. Therefore, non-magnetic motors including switched reluctance motors (SRMs, switched reluctance machines), synchronous reluctance motors (SynRMs, synchronous reluctance machines), induction motors (Ims, induction machines) and wound field synchronous machines (WFSMs, wound field synchronous machines) have developed rapidly.

[0003] According to the location of the excitation coil, the electrically excited synchronous motor can be further divided into rotor electrically excited synchronous motors (RWFSMs) and stator electrically excited synchronous motors (SWFSMs). Compared with the traditional rotor electrically excited motors that rely on brushes and slip rings, the stator electrically excited motors with the excitation coil located on the stator side have higher system stability and reliability due to the lack of sliding contact. In addition, the stator electrically excited synchronous motor has also attracted much attention due to its advantages such as simple rotor structure, easy processing, high sinusoidality of the armature winding induced electromotive force, and stable operation.

[0004] The induced voltage pulsation of the DC excitation winding is one of the important parasitic effects of the electrically excited synchronous motor, and its influence cannot be ignored when it runs at high speed. The induced voltage pulsation of the DC excitation winding will cause current ripple, which will affect the excitation stability, thereby reducing the stability and load capacity of the motor system. Although some research has been carried out on the induced electromotive force problem of the excitation winding of WFSMs, the research is limited to special motor topologies with complex partitioned stators. However, there is currently a lack of effective suppression methods for the induced voltage pulsation problem of the excitation winding of the electrically excited synchronous motor with a non-overlapping winding stator. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a method, system, terminal and medium for suppressing induced voltage pulsation of an excitation winding in view of the above-mentioned defects of the prior art. The specific scheme is as follows:

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is as follows:

[0007] In a first aspect, the present invention provides a method for suppressing induced voltage pulsation of an excitation winding, wherein the method comprises:

[0008] Selecting a preferred pole-slot combination of a target motor, and globally optimizing several parameter setting schemes of the target motor using the preferred pole-slot combination based on a genetic algorithm, to determine an optimal parameter setting scheme of the target motor using the preferred pole-slot combination, wherein the preferred pole-slot combination is used to reflect a preferred number of rotor poles that matches the target motor;

[0009] Analyze the electromagnetic performance of the target motor using the optimal pole-slot combination under different working conditions to obtain the induced electromotive force information of the excitation winding under different working conditions;

[0010] Based on the induced electromotive force information of the excitation winding, the optimal pole-slot coordination is determined, and the target motor is controlled to adopt the optimal pole-slot coordination to suppress the pulsation of the induced voltage of the excitation winding, so as to achieve optimization of the target motor.

[0011] In one implementation, the target motor is a three-phase non-overlapping winding stator electrically excited synchronous motor, and the three-phase non-overlapping winding stator electrically excited synchronous motor has a double salient pole structure in which both the stator and the rotor are salient poles, and the excitation winding and the armature winding in the three-phase non-overlapping winding stator electrically excited synchronous motor both adopt a non-overlapping distribution with a winding distance of 1 slot pitch.

[0012] In one implementation, the three-phase non-overlapping winding stator electrically excited synchronous motor includes a three-phase six-slot motor and / or a three-phase twelve-slot motor, and the preferred pole-slot matching includes a preferred rotor pole number matching with the three-phase six-slot motor and / or a preferred rotor pole number matching with the three-phase twelve-slot motor.

[0013] In one implementation, the globally optimizing several parameter setting schemes of the target motor using the preferred pole slot combination based on the genetic algorithm to determine the optimal parameter setting scheme of the target motor using the preferred pole slot combination includes:

[0014] The objective function is established with the minimum excitation induced voltage pulsation and the maximum average output torque within one electrical cycle as the optimization goal;

[0015] Randomly generate a number of individuals, wherein each individual represents a parameter setting scheme of a target motor using the preferred pole-slot combination, and the chromosome of each individual is composed of a gene set, and each gene in the gene set represents a motor parameter;

[0016] Calculate the fitness value corresponding to each individual according to the objective function, and determine whether a preset termination condition is currently reached, wherein the termination condition is that a maximum number of iterations is reached or there is an individual whose fitness value reaches a preset threshold;

[0017] If the termination condition is not met currently, the parent population for reproduction is selected according to the fitness value of each individual;

[0018] Performing chromosome crossover recombination on individuals in the parent population to obtain a number of new individuals;

[0019] Continue to calculate the fitness value corresponding to each individual according to the objective function until the termination condition is reached;

[0020] The optimal parameter setting scheme for the target motor using the preferred pole-slot combination is determined based on the individual with the highest fitness value among all current individuals.

[0021] In one implementation, the electromagnetic performance of the target motor using the preferred pole-slot combination under different working conditions is analyzed to obtain the induced electromotive force information of the excitation winding under different working conditions, including:

[0022] The electromagnetic performance of the target motor using the preferred pole-slot combination is analyzed under no-load conditions, armature current supply only conditions and load conditions, and the corresponding excitation winding induced electromotive force waveform diagram, excitation winding induced electromotive force spectrum diagram and excitation winding induced electromotive force peak-peak diagram under no-load conditions, armature current supply only conditions and load conditions are obtained respectively;

[0023] The excitation winding induced electromotive force information is obtained based on the excitation winding induced electromotive force waveform diagram, the excitation winding induced electromotive force spectrum diagram and the excitation winding induced electromotive force peak-to-peak diagram.

[0024] In one implementation, determining the optimal pole-slot matching based on the induced electromotive force information of the excitation winding includes:

[0025] Based on the information of the induced electromotive force of the excitation winding, the preferred pole-slot matching is sorted according to the harmonic types and harmonic amplitudes of the induced electromotive force of the excitation winding to obtain a pole-slot matching sequence;

[0026] The average output torque of the target motor using the preferred pole slot combination is obtained, and the optimal pole slot combination is determined from the pole slot combination sequence based on the principle of maximizing the average output torque.

[0027] In one implementation, the optimal pole-slot combination is the one with the smallest excitation induced voltage pulsation and the largest average output torque; for a three-phase six-slot motor, the optimal pole-slot combination is 6s / 5r and 6s / 7r; for a three-phase twelve-slot motor, the optimal pole-slot combination is 12s / 11r and 12s / 13r, wherein s represents the number of stator slots and r represents the number of rotor poles.

[0028] In a second aspect, an embodiment of the present invention further provides a system for suppressing induced voltage pulsation of an excitation winding, wherein the system comprises:

[0029] A parameter setting scheme optimization module is used to select a preferred pole slot combination of a target motor, and to globally optimize a number of parameter setting schemes of the target motor using the preferred pole slot combination based on a genetic algorithm, so as to determine an optimal parameter setting scheme of the target motor using the preferred pole slot combination, wherein the preferred pole slot combination is used to reflect a preferred number of rotor poles that matches the target motor;

[0030] An induced electromotive force information determination module is used to analyze the electromagnetic performance of the target motor using the preferred pole-slot combination under different working conditions to obtain the induced electromotive force information of the excitation winding under different working conditions;

[0031] The optimal pole-slot matching determination module is used to determine the optimal pole-slot matching based on the induced electromotive force information of the excitation winding, and control the target motor to adopt the optimal pole-slot matching to suppress the pulsation of the induced voltage of the excitation winding, so as to optimize the target motor.

[0032] In a third aspect, an embodiment of the present invention further provides a terminal, wherein the terminal includes a memory, a processor, and an excitation winding induced voltage pulsation suppression program stored in the memory and executable on the processor, and when the processor executes the excitation winding induced voltage pulsation suppression program, the processor implements the steps of the excitation winding induced voltage pulsation suppression method as described in any one of the above schemes.

[0033] In a fourth aspect, an embodiment of the present invention further provides a computer-readable storage medium, wherein a program for suppressing the induced voltage pulsation of an excitation winding is stored on the computer-readable storage medium, and when the program for suppressing the induced voltage pulsation of an excitation winding is executed by a processor, the steps of the method for suppressing the induced voltage pulsation of an excitation winding as described in any of the above schemes are implemented.

[0034] Beneficial effect: Compared with the prior art, the present invention provides a method for suppressing the induced voltage pulsation of the excitation winding. First, the preferred pole-slot combination of the target motor is selected, and several parameter setting schemes of the target motor using the preferred pole-slot combination are globally optimized based on the genetic algorithm to determine the optimal parameter setting scheme of the target motor using the preferred pole-slot combination, wherein the preferred pole-slot combination is used to reflect the preferred number of rotor poles matched with the target motor. Then, the electromagnetic performance of the target motor using the preferred pole-slot combination under different working conditions is analyzed to obtain the induced electromotive force information of the excitation winding under different working conditions. Finally, based on the induced electromotive force information of the excitation winding, the optimal pole-slot combination is determined, and the target motor is controlled to use the optimal pole-slot combination to suppress the induced voltage pulsation of the excitation winding, so as to achieve the optimization of the target motor. The present invention analyzes the electromagnetic performance of different pole-slot combinations of the non-overlapping winding stator electric excitation synchronous motor under different working conditions, thereby determining the optimal pole-slot combination, and then the optimal pole-slot combination is used to maximize the weakening of the induced voltage pulsation of the excitation winding, effectively improving the stability of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A flowchart of a specific implementation of a method for suppressing induced voltage pulsation of an excitation winding provided by an embodiment of the present invention.

[0036] Figure 2 This is a first exemplary diagram of the structure and winding configuration of the three-phase non-overlapping winding stator electrically excited synchronous motor of this embodiment.

[0037] Figure 3 This is a second exemplary diagram of the structure and winding configuration of the three-phase non-overlapping winding stator electrically excited synchronous motor of this embodiment.

[0038] Figure 4 The waveform diagram of the magnetic flux of the excitation winding of a non-overlapping winding stator electrically excited synchronous motor with a pole-slot combination of 6s / 7r under different working conditions.

[0039] Figure 5 The waveform diagram of the induced electromotive force of the excitation winding of a non-overlapping winding stator electrically excited synchronous motor with a pole-slot combination of 6s / 7r under different working conditions.

[0040] Figure 6 This is the waveform of the induced electromotive force of the excitation winding of a three-phase six-slot non-overlapping winding stator electrically excited synchronous motor under no-load conditions.

[0041] Figure 7 This is the spectrum diagram of the induced electromotive force of the excitation winding of a three-phase six-slot non-overlapping winding stator electrically excited synchronous motor under no-load conditions.

[0042] Figure 8This is the waveform of the induced electromotive force of the excitation winding of a three-phase twelve-slot non-overlapping winding stator electrically excited synchronous motor under no-load conditions.

[0043] Fig. 9 This is the spectrum diagram of the induced electromotive force of the excitation winding of a three-phase twelve-slot non-overlapping winding stator electrically excited synchronous motor under no-load conditions.

[0044] Fig.10 This is the waveform of the induced electromotive force of the excitation winding of a three-phase six-slot non-overlapping winding stator electrically excited synchronous motor under the condition of armature current supply only.

[0045] Fig.11 This is the spectrum diagram of the induced electromotive force of the excitation winding of a three-phase twelve-slot non-overlapping winding stator electrically excited synchronous motor under the condition of armature current supply only.

[0046] Fig.12 This is the waveform of the induced electromotive force of the excitation winding of a three-phase six-slot non-overlapping winding stator electrically excited synchronous motor under load conditions.

[0047] Fig.13 This is the spectrum diagram of the induced electromotive force of the excitation winding of a three-phase six-slot non-overlapping winding stator electrically excited synchronous motor under load conditions.

[0048] Fig.14 This is the waveform of the induced electromotive force of the excitation winding of a three-phase twelve-slot non-overlapping winding stator electrically excited synchronous motor under load conditions.

[0049] Fig.15 This is the spectrum diagram of the induced electromotive force of the excitation winding of a three-phase twelve-slot non-overlapping winding stator electrically excited synchronous motor under load conditions.

[0050] Fig.16 The peak-to-peak diagram of the induced electromotive force of the stator excitation synchronous motor with non-overlapping windings in each pole slot under different conditions.

[0051] Fig.17 This is the output torque waveform of the three-phase six-slot non-overlapping winding stator electrically excited synchronous motor under load conditions.

[0052] Fig.18 This is the output torque waveform of the three-phase twelve-slot non-overlapping winding stator electrically excited synchronous motor under load conditions.

[0053] Fig.19 The present invention provides a block diagram of the principle of a system for suppressing induced voltage pulsation of an excitation winding according to an embodiment of the present invention.

[0054] Fig. 20 A functional block diagram of a terminal provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0055] In order to make the purpose, technical solution and effect of the present invention clearer and more specific, the present invention is further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0056] In view of the deficiencies mentioned in the technical background, the present invention aims to study the generation mechanism of the induced electromotive force of the excitation winding of an electrically excited synchronous motor, and strive to effectively suppress the induced voltage pulsation of the excitation winding by optimizing the pole slot matching, so as to improve the overall performance of the motor. This embodiment provides a method for suppressing the induced voltage pulsation of the excitation winding. Based on the method of this embodiment, the electromagnetic performance of different pole slot matchings of the non-overlapping winding stator electrically excited synchronous motor under different working conditions can be analyzed to determine the optimal pole slot matching, and then the induced voltage pulsation of the excitation winding can be weakened to the maximum extent by adjusting the pole slot matching. In specific applications, this embodiment can first select the preferred pole slot matching of the target motor, and globally optimize several parameter setting schemes of the target motor using the preferred pole slot matching based on the genetic algorithm, and determine the optimal parameter setting scheme of the target motor using the preferred pole slot matching, wherein the preferred pole slot matching is used to reflect the preferred number of rotor poles matched with the target motor. Then, the electromagnetic performance of the target motor using the preferred pole slot matching under different working conditions is analyzed to obtain the induced electromotive force information of the excitation winding under different working conditions. Finally, based on the induced electromotive force information of the excitation winding, the optimal pole-slot coordination is determined, and the target motor is controlled to adopt the optimal pole-slot coordination to suppress the pulsation of the induced voltage of the excitation winding, so as to optimize the target motor.

[0057] The method for suppressing the pulsation of the induced voltage of the excitation winding of the present embodiment can be applied to a terminal, which can be an intelligent product terminal with image analysis function, data processing function and communication function, such as a computer. Figure 1 As shown in the figure, the method for suppressing the induced voltage pulsation of the excitation winding of this embodiment includes the following steps:

[0058] Step S100, selecting a preferred pole-slot combination of the target motor, and globally optimizing several parameter setting schemes of the target motor using the preferred pole-slot combination based on a genetic algorithm, to determine the optimal parameter setting scheme of the target motor using the preferred pole-slot combination, wherein the preferred pole-slot combination is used to reflect the preferred number of rotor poles that matches the target motor.

[0059] The target motor of this embodiment is a three-phase non-overlapping winding stator electrically excited synchronous motor, which has a double salient pole structure in which both the stator and the rotor are salient poles. The motor topology is as follows: Figure 2 and 3 shown. Figure 2It is a three-phase non-overlapping winding stator electrically excited synchronous motor with a pole-slot combination of 6s / 8r, where s represents the number of stator slots and r represents the number of rotor poles. Figure 3 It is a three-phase non-overlapping winding stator electric excitation synchronous motor with a pole slot matching of 12s / 14r. The A+, B+, and C+ coils are the armature windings of the motor. Figure 3 and Figure 4 middle, The coil (i=1,2,…,n, n is the total number of motor excitation windings) is the excitation winding of the motor. The excitation winding and the armature winding in the three-phase non-overlapping winding stator electrically excited synchronous motor of this embodiment both adopt a non-overlapping distribution with a winding distance of 1 slot, and are alternately wound on the stator teeth in the order of excitation-armature-excitation-…, and the excitation coils have the same polarity. Preferably, the three-phase non-overlapping winding stator electrically excited synchronous motor adopted in this embodiment includes a three-phase six-slot motor and / or a three-phase twelve-slot motor, the six-slot motor is provided with one armature winding per phase, and the 12-slot motor is provided with two armature windings per phase. This embodiment is based on the torque equation of the electrically excited motor: , where p is the pole pair number, and are the d-axis magnetic flux and the q-axis magnetic flux respectively. and are the currents of the d-axis flux and the q-axis flux respectively, and the first term of the equation is the reluctance torque. The motor salient pole ratio in this embodiment is close to 1, and the reluctance torque accounts for a very small proportion, so The control strategy can set the reluctance torque of the motor to 0, so that all the current of the electromagnetic motor can be used to generate torque. In addition to simplifying the control strategy, this method can make the current of the electromagnetic motor be used to generate torque to achieve maximum torque per current ratio (MTPA). At the same time, the armature winding adopts brushless AC drive to achieve more sinusoidal phase flux and back electromotive force to ensure stable torque output.

[0060] The three-phase non-overlapping winding stator electrically excited synchronous motor achieves effective operation based on the rotor salient pole magnetic field modulation effect. In theory, except for multiples of the armature winding phase number, any other integer rotor poles can effectively modulate the air gap magnetic field and provide a stable output torque. In order to obtain a higher winding coefficient and better torque performance. In this embodiment, the preferred pole-slot combination of the target motor is first selected. The preferred pole-slot combination includes the preferred number of rotor poles that matches the three-phase six-slot motor and / or the preferred number of rotor poles that matches the three-phase twelve-slot motor. Specifically, in the three-phase six-slot motor involved in this embodiment, the preferred number of rotor poles is 4, 5, 7, and 8; in the three-phase twelve-slot motor, the preferred number of rotor poles is 10, 11, 13, and 14. This embodiment studies the influence of pole-slot combination on the induced voltage pulsation phenomenon of the excitation winding under different working conditions for the above eight preferred pole-slot combinations of motors. Among them, the topology of the three-phase non-overlapping winding stator electrically excited synchronous motor with pole-slot combinations of 6s / 8r and 12s / 14r is as follows Figure 2 and Figure 3 shown.

[0061] Furthermore, in order to carry out follow-up research based on the above eight preferred pole-slot combinations of motors, reduce the interference of other factors, and more accurately explore the influence of pole-slot combinations on motor performance, this embodiment uses a genetic algorithm to globally optimize several parameter setting schemes of the target motor using the above eight preferred pole-slot combinations. The steps of the genetic algorithm are as follows: taking the minimum excitation induced voltage pulsation and the maximum average output torque within an electrical cycle as the optimization goal, establish an objective function; randomly generate a number of individuals, wherein each individual represents a parameter setting scheme of the target motor using the preferred pole slot combination, and the chromosome of each individual is composed of a gene set, and each gene in the gene set represents a motor parameter; calculate the fitness value corresponding to each individual according to the objective function, and judge whether the preset termination condition is currently reached, and the termination condition is that the maximum number of iterations is reached or there is an individual whose fitness value reaches a preset threshold; if the termination condition is not currently reached, the parent population for reproduction is screened out according to the fitness value of each individual; perform chromosome crossover recombination on the individuals in the parent population to obtain a number of new individuals; continue to execute the fitness value calculation of each individual according to the objective function until the termination condition is reached; determine the optimal parameter setting scheme of the target motor using the preferred pole slot combination according to the individual with the highest fitness value among all current individuals. In other implementations, this embodiment can also use different selection algorithms to screen out the parent population for reproduction. In addition, this embodiment can add gene mutation operations to increase the richness of the population, and when performing chromosome crossover recombination on individuals in the parent population, it can also add single-point crossover, multi-point crossover, and different crossover methods to choose from, so as to obtain more types of new individuals.

[0062] Since the rated speed of 400rpm is relatively low, copper loss is the main loss at this speed, so other losses are not considered. In the optimization process, the total copper loss is set to be 60W, and the optimal excitation winding copper loss ( ) and total copper loss ( ) The ratio of the copper loss ratio of the stator to the three-phase non-overlapping winding is 0.5, so that the average torque output of the three-phase non-overlapping winding stator electric excitation synchronous motor is maximized when the total copper loss is constant. Because the optimal copper loss ratio is greater than 0.5 under high saturation conditions, the copper loss ratio also needs to be considered in the optimization process. In the global optimization process, the air gap length, stator outer diameter, axial length, and rotor shaft radius remain unchanged. The optimal parameter setting scheme after optimization is shown in Table 1.

[0063] Table 1 Optimal parameter setting scheme for three-phase non-overlapping winding stator electrically excited synchronous motor

[0064]

[0065] This embodiment determines the optimal parameter setting scheme for the target motor using the above-mentioned preferred pole slot combination, thereby ensuring that, in terms of optimal structural technology, subsequent motor performance improvements can only be caused by changes in pole slot combination, and can more accurately explore the impact of pole slot combination on motor performance and reduce interference from other factors.

[0066] Step S200, analyzing the electromagnetic performance of the target motor using the preferred pole-slot combination under different working conditions to obtain the induced electromotive force information of the excitation winding under different working conditions.

[0067] Specifically, this embodiment analyzes the electromagnetic performance of the target motor under three working conditions: no-load OC, armature current power supply AC only, and load OL, and analyzes the mechanism of the induced voltage pulsation of the excitation winding. First, the three working conditions involved in this embodiment and the operating principles under each working condition are described as follows:

[0068] 1. No-load condition OC. In this condition, the armature winding is open-circuited and the excitation winding is supplied with constant DC. Due to the double-pole structure and air-gap magnetic field modulation effect of the target motor, there are a large number of harmonics in the air-gap magnetic field of the target motor, generating flux linkage and induced electromotive force in both the open-circuit armature winding and the excitation winding. The waveforms of the pulsating flux linkage and induced electromotive force generated in the excitation winding are as follows: Figure 4 and Figure 5 As shown by the red line in the middle, take the non-overlapping winding stator electric excitation synchronous motor with a pole slot combination of 6s / 7r as an example. Figure 4 The waveform diagrams of the magnetic flux of the excitation winding of a non-overlapping winding stator electrically excited synchronous motor with a pole-slot combination of 6s / 7r under different conditions are shown. Figure 5 The waveforms of the induced electromotive force of the excitation winding of a non-overlapping winding stator electrically excited synchronous motor with a pole-slot combination of 6s / 7r under different conditions are shown.

[0069] 2. AC condition with only armature current supply. In this condition, the field winding is not energized, and the armature winding is supplied with three-phase sinusoidal AC. Due to the mutual inductance between the armature winding and the field winding, there is still an induced electromotive force in the field winding, such as Figure 5 Shown in black line.

[0070] 3. Load condition OL. Under this condition, there are no-load induced electromotive force and armature induced electromotive force in the excitation winding at the same time, such as Figure 5 However, due to the magnetic saturation effect, the induced electromotive force under load cannot be calculated simply by adding the armature induced electromotive force and the no-load induced electromotive force.

[0071] From the above analysis of the mechanism of induced voltage pulsation under three working conditions, it can be seen that the pole-slot matching of the motor has a certain influence on the induced voltage pulsation. In order to specifically explore this influence, the target motor using the above-mentioned preferred pole-slot matching after global optimization is then studied under three working conditions: no-load OC, armature current power supply AC only, and load OL. In specific application, this embodiment analyzes the electromagnetic performance of the target motor using the above-mentioned preferred pole-slot matching under no-load conditions, armature current power supply conditions only, and load conditions, and obtains the corresponding excitation winding induced electromotive force waveform diagram, excitation winding induced electromotive force spectrum diagram, and excitation winding induced electromotive force peak-peak diagram under no-load conditions, armature current power supply conditions only, and load conditions. Then, based on the excitation winding induced electromotive force waveform diagram, the excitation winding induced electromotive force spectrum diagram, and the excitation winding induced electromotive force peak-peak diagram, the excitation winding induced electromotive force information is obtained. The excitation winding induced electromotive force information of this embodiment includes induced electromotive force waveform, electromotive force harmonic order, harmonic amplitude, etc.

[0072] Specifically, under no-load OC conditions, the induced electromotive force of the excitation winding of the three-phase six-slot motor changes periodically with the change of the rotor position, such as Figure 6 As shown. Among them, the target motor with a pole-slot combination of 6s / 8r has the highest induced electromotive force, the target motor with a pole-slot combination of 6s / 4r has the lowest induced electromotive force, and the induced electromotive force waveforms of the target motors with pole-slot combinations of 6s / 5r and 6s / 7r are very similar. The no-load electromotive force spectrum of the excitation winding of these four motors is shown in Figure 7 As shown in the figure, the harmonic order is 3k (k is an integer), but the amplitudes of their low-order harmonics (mainly the 3rd and 6th harmonics) are different, resulting in differences in the induced electromotive force of the excitation winding. The situation of the three-phase twelve-slot motor is different. Figure 8The waveform of the electromotive force of the three-phase twelve-slot motor under the no-load OC condition is shown. The results show that the target motor with a pole-slot combination of 12s / 10r has the highest electromotive force, followed by the target motor with a pole-slot combination of 12s / 14r, and the electromotive force waveforms of the target motors with pole-slot combinations of 12s / 11r and 12s / 13r are very similar and lower than the other two motors. Under the no-load OC condition, the electromotive force harmonic order of the target motors with pole-slot combinations of 12s / 10r and 12s / 14r is 3k, while the electromotive force harmonic order of the target motors with pole-slot combinations of 12s / 11r and 12s / 13r is 6k, as shown in Fig. 9 shown.

[0073] Under AC working condition where only armature current is supplied, the armature induced electromotive force of the three-phase six-slot motor is as follows: Fig.10 As shown, the electromotive force of a three-phase twelve-slot motor is as follows Fig.11 As shown, the harmonic order of the induced electromotive force under the condition of only armature current supply is the same as that under no-load OC condition.

[0074] Under the load OL condition, for the three-phase six-slot motor, the target motor with a pole-slot combination of 6s / 4r still has the smallest electromotive force, followed by the target motor with a pole-slot combination of 6s / 5r. The target motors with pole-slot combinations of 6s / 7r and 6s / 8r have similar waveforms under the load OL condition, such as Fig.12 As shown in the figure. Since the harmonic order of the induced electromotive force under the AC condition with only armature current supply is the same as that under the no-load OC condition, the harmonic order of the electromotive force of these four motors under load is also 3k, as shown in the figure. Fig.13 As shown. For the three-phase twelve-slot motor, the target motor with a pole-slot combination of 12s / 14r has the highest induced electromotive force, followed by the target motor with a pole-slot combination of 12s / 10r. The electromotive force waveforms of the target motors with pole-slot combinations of 12s / 11r and 12s / 13r are similar, as shown Fig.14 Similarly, since the harmonic order of the induced electromotive force under the armature current supply condition is the same as that under the no-load condition, the load electromotive force harmonic order of the target motor with a pole-slot combination of 12s / 10r and 12s / 14r is 3k, and the load electromotive force harmonic order of the motor with a pole-slot combination of 12s / 11r and 12s / 13r is 6k, as shown in Fig.15 The peak-to-peak values ​​of the induced electromotive force of the excitation winding with different pole-slot combinations under no-load OC and load OL conditions are shown in Fig.16 As shown in the figure, since the electromotive force under the load OL condition consists of two components: no-load and armature induced electromotive force, the peak-to-peak value of the induced electromotive force of each motor under the no-load OC condition is much smaller than that under the load OL condition.

[0075] It can be seen that in this embodiment, the peak-to-peak value of the induced electromotive force of the target motor with each pole slot combination is affected by magnetic saturation, but the harmonic order of the electromotive force is not affected by magnetic saturation. A comprehensive analysis of the three working conditions is performed, and the harmonic order of the induced electromotive force of the excitation winding of the target motor with different pole slot combinations under different working conditions is shown in Table 2.

[0076] Table 2 Harmonic order of induced electromotive force of excitation winding

[0077]

[0078] Under no-load OC and load OL conditions, since the excitation winding electromotive force contains both odd and even harmonics and the amplitude of the low-order harmonics is large, the peak-to-peak value of the electromotive force of the three-phase six-slot motor is greater than that of the three-phase twelve-slot motor, and the peak-to-peak value of the electromotive force of the target motor with pole-slot combinations of 12s / 10r and 12s / 14r is greater than that of the other two three-phase twelve-slot motors.

[0079] Step S300, based on the induced electromotive force information of the excitation winding, determine the optimal pole-slot coordination, and control the target motor to adopt the optimal pole-slot coordination to suppress the pulsation of the induced voltage of the excitation winding, so as to optimize the target motor.

[0080] Specifically, based on the above-obtained information on the induced electromotive force of the excitation winding, this embodiment can sort the preferred pole-slot combinations according to the harmonic types and harmonic amplitudes of the induced electromotive force of the excitation winding to obtain a pole-slot combination sequence, and the pole-slot combination sequence arranges the preferred pole-slot combinations according to the harmonic types and harmonic amplitudes from large to small for the three-phase six-slot motor and the three-phase twelve-slot motor respectively. The pole-slot combination with the least harmonic types and the lowest harmonic amplitude can effectively suppress the pulsation of the induced voltage of the excitation winding. Therefore, this embodiment can obtain the preferred pole-slot combination with the least harmonic types and the lowest harmonic amplitude in the three-phase six-slot motor and the three-phase twelve-slot motor respectively according to the pole-slot combination sequence. Furthermore, for the motor, generating a larger average output torque means a larger torque density and better performance. Based on this, this embodiment can further obtain the average output torque of the target motor using the above-mentioned preferred pole-slot combination, and determine the optimal pole-slot combination from the pole-slot combination sequence based on the principle of maximizing the average output torque. Fig.17 and Fig.18As shown, the greater the peak-to-peak value of the motor induced electromotive force, the greater the torque ripple. In addition, among the above-mentioned 8 types of target motors with pole-slot combinations, the target motors with higher winding coefficients of 6s / 5r, 6s / 7r, 12s / 11r, and 12s / 13r can produce a larger average output torque and a stronger load capacity than the target motors with the same number of slots. To this end, the optimal pole-slot combination determined in this embodiment is the pole-slot combination with the smallest excitation induced voltage pulsation and the largest average output torque; for a three-phase six-slot motor, the optimal pole-slot combination is 6s / 5r and 6s / 7r; for a three-phase twelve-slot motor, the optimal pole-slot combination is 12s / 11r and 12s / 13r.

[0081] After determining the optimal pole-slot match, this embodiment can control the target motor to adopt the optimal pole-slot match to suppress the induced voltage pulsation of the excitation winding, so as to optimize the target motor. It can be seen that this embodiment first defines the overall topology of the non-overlapping winding stator electrically excited synchronous motor, and uses the finite element analysis (FEA) method to deeply analyze the induced voltage pulsation of the excitation winding and its generation mechanism of different slot-pole combinations of the non-overlapping winding stator electrically excited synchronous motor under no-load conditions OC, only armature current supply conditions AC and load conditions OL, and according to experimental data, it is obtained that the pole-slot match of the three-phase non-overlapping winding stator electrically excited synchronous motor has a significant effect on the induced voltage pulsation of its excitation winding. This embodiment selects a suitable pole-slot match to make the motor winding coefficient higher, the induced back electromotive force harmonic component less, and the low-order harmonic amplitude lower, thereby maximizing the weakening of the induced voltage pulsation method of the excitation winding, effectively improving the stability of such motors. The present invention not only improves the stability and efficiency of the non-overlapping winding stator electrically excited synchronous motor, but also provides a theoretical basis and practical guidance for further optimization of the motor.

[0082] Furthermore, the method proposed in the present invention for suppressing induced voltage pulsation by designing the optimal pole-slot matching is based on the principle of suppressing induced voltage pulsation by changing the topological structure of the motor, thereby reducing the induced electromotive force harmonics in the excitation winding. In other implementations, the suppression of induced voltage pulsation in the excitation winding can also be achieved by optimizing other topological structures of the motor, such as the shape of the stator and rotor teeth, the air gap length, the number of winding phases, etc. The object of the present invention is a three-phase non-overlapping winding stator electrically excited synchronous motor, and the method can be extended to other electrically excited synchronous motors with similar principles. In addition, the core of the present invention is to suppress the induced voltage pulsation of the excitation winding of the three-phase non-overlapping winding stator electrically excited synchronous motor by using pole-slot matching, and the design target is the induced voltage pulsation of the excitation winding. In fact, the influence of the induced voltage pulsation of the excitation winding is also reflected in the back-EMF harmonics, cogging torque, torque pulsation, etc. Therefore, in other implementation methods, the design objectives can be deformed, such as the back-EMF harmonic weakening method, cogging torque weakening method, torque pulsation weakening method, etc. of the three-phase non-overlapping winding stator electrically excited synchronous motor based on pole-slot matching.

[0083] Based on the above embodiments, the present invention also provides a system for suppressing induced voltage pulsation of an excitation winding, such as Fig.19 As shown, the system includes: a parameter setting scheme optimization module 10, an induced electromotive force information determination module 20 and an optimal pole-slot matching determination module 30. Specifically, the parameter setting scheme optimization module 10 is used to select the preferred pole-slot matching of the target motor, and globally optimize several parameter setting schemes of the target motor using the preferred pole-slot matching based on the genetic algorithm, and determine the optimal parameter setting scheme of the target motor using the preferred pole-slot matching, wherein the preferred pole-slot matching is used to reflect the preferred number of rotor poles that matches the target motor. The induced electromotive force information determination module 20 is used to analyze the electromagnetic performance of the target motor using the preferred pole-slot matching under different working conditions, and obtain the induced electromotive force information of the excitation winding under different working conditions. The optimal pole-slot matching determination module 30 is used to determine the optimal pole-slot matching based on the induced electromotive force information of the excitation winding, and control the target motor to use the optimal pole-slot matching to suppress the induced voltage pulsation of the excitation winding, so as to optimize the target motor.

[0084] The working principles of each module in the excitation winding induced voltage pulsation suppression system of this embodiment are the same as the principles of each step in the above method embodiment, and will not be repeated here.

[0085] Based on the above embodiment, the present invention further provides a terminal, the principle block diagram of the terminal can be as follows: Fig. 20 The terminal may include one or more processors 100 ( Fig. 20Only one is shown in the figure), a memory 101 and a computer program 102 stored in the memory 101 and executable on one or more processors 100, for example, a program for suppressing induced voltage pulsation of an excitation winding. When one or more processors 100 execute the computer program 102, the various steps in the embodiment of the method for suppressing induced voltage pulsation of an excitation winding can be implemented. Alternatively, when one or more processors 100 execute the computer program 102, the functions of the various modules / units in the embodiment of the method for suppressing induced voltage pulsation of an excitation winding can be implemented, which is not limited here.

[0086] In one embodiment, the processor 100 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc.

[0087] In one embodiment, the memory 101 may be an internal storage unit of an electronic device, such as a hard disk or memory of the electronic device. The memory 101 may also be an external storage device of the electronic device, such as a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. equipped on the electronic device. Further, the memory 101 may also include both an internal storage unit of the electronic device and an external storage device. The memory 101 is used to store computer programs and other programs and data required by the terminal. The memory 101 may also be used to temporarily store data that has been output or is to be output.

[0088] Those skilled in the art will understand that Fig. 20 The principle block diagram shown in the figure is only a block diagram of a partial structure related to the scheme of the present invention, and does not constitute a limitation on the terminal to which the scheme of the present invention is applied. The specific terminal may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0089] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, operating database or other media used in the embodiments provided by the present invention may include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double operational data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), etc.

[0090] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for suppressing induced voltage pulsation of an excitation winding, characterized in that: The method comprises: Selecting a preferred pole-slot combination of a target motor, and globally optimizing several parameter setting schemes of the target motor using the preferred pole-slot combination based on a genetic algorithm, to determine an optimal parameter setting scheme of the target motor using the preferred pole-slot combination, wherein the preferred pole-slot combination is used to reflect a preferred number of rotor poles that matches the target motor; Analyze the electromagnetic performance of the target motor using the optimal pole-slot combination under different working conditions to obtain the induced electromotive force information of the excitation winding under different working conditions; Based on the induced electromotive force information of the excitation winding, the optimal pole-slot coordination is determined, and the target motor is controlled to adopt the optimal pole-slot coordination to suppress the pulsation of the induced voltage of the excitation winding, so as to achieve optimization of the target motor.

2. The method for suppressing induced voltage pulsation of an excitation winding according to claim 1, characterized in that: The target motor is a three-phase non-overlapping winding stator electrically excited synchronous motor, which has a double salient pole structure in which both the stator and the rotor are salient poles. The excitation winding and the armature winding in the three-phase non-overlapping winding stator electrically excited synchronous motor both adopt a non-overlapping distribution with a winding distance of 1 slot pitch.

3. The method for suppressing induced voltage pulsation of an excitation winding according to claim 2, characterized in that: The three-phase non-overlapping winding stator electrically excited synchronous motor includes a three-phase six-slot motor and / or a three-phase twelve-slot motor, and the preferred pole-slot combination includes a preferred rotor pole number that matches the three-phase six-slot motor and / or a preferred rotor pole number that matches the three-phase twelve-slot motor.

4. The method for suppressing induced voltage pulsation of an excitation winding according to claim 1, characterized in that: The globally optimizing several parameter setting schemes of the target motor using the preferred pole slot combination based on the genetic algorithm to determine the optimal parameter setting scheme of the target motor using the preferred pole slot combination includes: The objective function is established with the minimum excitation induced voltage pulsation and the maximum average output torque within one electrical cycle as the optimization goal; Randomly generate a number of individuals, wherein each individual represents a parameter setting scheme of a target motor using the preferred pole-slot combination, and the chromosome of each individual is composed of a gene set, and each gene in the gene set represents a motor parameter; Calculate the fitness value corresponding to each individual according to the objective function, and determine whether a preset termination condition is currently reached, wherein the termination condition is that a maximum number of iterations is reached or there is an individual whose fitness value reaches a preset threshold; If the termination condition is not met currently, the parent population for reproduction is selected according to the fitness value of each individual; Performing chromosome crossover recombination on individuals in the parent population to obtain a number of new individuals; Continue to calculate the fitness value corresponding to each individual according to the objective function until the termination condition is reached; The optimal parameter setting scheme for the target motor using the preferred pole-slot combination is determined based on the individual with the highest fitness value among all current individuals.

5. The method for suppressing induced voltage pulsation of an excitation winding according to claim 3, characterized in that: The electromagnetic performance of the target motor using the preferred pole-slot combination under different working conditions is analyzed to obtain the induced electromotive force information of the excitation winding under different working conditions, including: The electromagnetic performance of the target motor using the preferred pole-slot combination is analyzed under no-load conditions, armature current supply only conditions and load conditions, and the corresponding excitation winding induced electromotive force waveform diagram, excitation winding induced electromotive force spectrum diagram and excitation winding induced electromotive force peak-peak diagram under no-load conditions, armature current supply only conditions and load conditions are obtained respectively; The excitation winding induced electromotive force information is obtained based on the excitation winding induced electromotive force waveform diagram, the excitation winding induced electromotive force spectrum diagram and the excitation winding induced electromotive force peak-to-peak diagram.

6. The method for suppressing induced voltage pulsation of the excitation winding according to claim 5, characterized in that: The determining of the optimal pole-slot matching based on the induced electromotive force information of the excitation winding comprises: Based on the information of the induced electromotive force of the excitation winding, the preferred pole-slot matching is sorted according to the harmonic types and harmonic amplitudes of the induced electromotive force of the excitation winding to obtain a pole-slot matching sequence; The average output torque of the target motor using the preferred pole slot combination is obtained, and the optimal pole slot combination is determined from the pole slot combination sequence based on the principle of maximizing the average output torque.

7. The method for suppressing induced voltage pulsation of an excitation winding according to claim 6, characterized in that: The optimal pole-slot combination is the one with the smallest excitation induced voltage pulsation and the largest average output torque; for a three-phase six-slot motor, the optimal pole-slot combination is 6s / 5r and 6s / 7r; for a three-phase twelve-slot motor, the optimal pole-slot combination is 12s / 11r and 12s / 13r, wherein s represents the number of stator slots and r represents the number of rotor poles.

8. A system for suppressing induced voltage pulsation of an excitation winding, characterized in that: The system comprises: A parameter setting scheme optimization module is used to select a preferred pole slot combination of a target motor, and to globally optimize a number of parameter setting schemes of the target motor using the preferred pole slot combination based on a genetic algorithm, so as to determine an optimal parameter setting scheme of the target motor using the preferred pole slot combination, wherein the preferred pole slot combination is used to reflect a preferred number of rotor poles that matches the target motor; An induced electromotive force information determination module is used to analyze the electromagnetic performance of the target motor using the preferred pole-slot combination under different working conditions to obtain the induced electromotive force information of the excitation winding under different working conditions; The optimal pole-slot matching determination module is used to determine the optimal pole-slot matching based on the induced electromotive force information of the excitation winding, and control the target motor to adopt the optimal pole-slot matching to suppress the pulsation of the induced voltage of the excitation winding, so as to optimize the target motor.

9. A terminal, characterized in that: The terminal includes a memory, a processor, and an excitation winding induced voltage pulsation suppression program stored in the memory and executable on the processor. When the processor executes the excitation winding induced voltage pulsation suppression program, the processor implements the steps of the excitation winding induced voltage pulsation suppression method as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a program for suppressing the induced voltage pulsation of an excitation winding. When the program for suppressing the induced voltage pulsation of an excitation winding is executed by a processor, the steps of the method for suppressing the induced voltage pulsation of an excitation winding as described in any one of claims 1 to 7 are implemented.

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