A high power density winding structure and a parameter design method thereof

Abstract

The application discloses a high-power-density winding structure and a parameter design method thereof. The structure comprises a stator core base module, a multi-phase winding prototype module, an upper and lower element edge matching module and a differential number of turns single-phase winding module. The method comprises the following steps: calculating the slot pitch electric angle of the motor; obtaining the instantaneous values of the currents of each phase of the motor and combining the slot pitch electric angle to calculate the single-slot electric angle, so as to determine the phase type to which the upper element edge of the single slot of the motor belongs and the phase type to which the lower element edge of the single slot of the motor belongs; according to the instantaneous values of the currents of each phase, the phase type to which the upper element edge of the single slot of the motor belongs and the phase type to which the lower element edge of the single slot of the motor belongs, the synthesized magnetomotive force of the single slot of the motor is calculated, and the original multi-phase winding of the motor is replaced by a single-phase winding, so as to determine the actual integral number of turns of the single slot of the motor. The application can reduce the volume, weight and loss of the motor by constructing a high-power-density winding. The application can be widely applied to the technical field of motor design.

Description

Technical Field

[0001] This invention relates to the field of motor design technology, and in particular to a high power density winding structure and its parameter design method. Background Technology

[0002] In the field of marine engineering, the excitation force generated by the flow of liquid inside pipelines can easily cause pipeline vibration, and under severe conditions, it can induce pipeline resonance, thereby adversely affecting the overall structural safety of the ship. Traditional mechanical vibration absorbers rely on a spring-mass resonant structure to achieve passive vibration absorption, which only works within a narrow frequency band near its natural frequency, resulting in limited actual vibration absorption effect. Existing electromagnetic vibration absorbers mostly use linear oscillating motors, which collect vibration acceleration signals through sensors and output reverse control force to achieve wide-frequency active vibration suppression, but their overall size and weight are relatively large, making them difficult to adapt to compact installation scenarios.

[0003] The output force characteristics and dynamic response speed of electromagnetic vibration absorbers are mainly determined by the winding structure. Currently, the most commonly used winding types include: voice coil cylindrical windings, where the coil is arranged in a cylindrical shape in an annular air gap, and the mover uses a permanent magnet structure; salient pole concentrated windings, where the coil is directly wound on the iron core teeth, and each tooth can be independently energized; annular coreless windings, where the coil is a self-supporting annular structure and does not rely on the iron core for magnetic conduction; and multi-layer segmented windings, where the coil is divided into multiple layers and segments connected in series or parallel.

[0004] The aforementioned winding structures generally suffer from low power density. Specifically, voice coil cylindrical windings have long ends, occupying axial space and having poor heat dissipation, thus limiting the amount of current that can pass through the winding; salient pole concentrated windings exhibit significant electromagnetic force nonlinearity and prominent cogging effects, reducing the stability and efficiency of electromagnetic force output; toroidal coreless windings have low inductance, requiring a large drive current to achieve the set electromagnetic force, leading to increased copper losses; multi-layer segmented windings have complex manufacturing processes, low winding fill factor, and insufficient power output per unit volume.

[0005] As new-generation ship equipment continues to develop towards miniaturization and high performance, the available installation space in the equipment compartment is constantly being compressed, and existing electromagnetic vibration absorbers can no longer meet the requirements for layout and use.

[0006] In summary, the technical problems existing in the relevant technologies need to be improved. Summary of the Invention

[0007] To address the aforementioned technical problems, the present invention aims to provide a high power density winding structure and its parameter design method, which can reduce the size, weight, and losses of the motor by constructing a high power density winding.

[0008] The first technical solution adopted in this invention is: a high power density winding structure, comprising a stator core base module, a multiphase winding prototype module, an upper and lower element side pairing module, and a single-phase winding module with differentiated turns, wherein: The stator core base module is used to provide a physical mounting carrier for the windings and to conduct magnetic fields. The multiphase winding prototype module is used to generate a low-harmonic, sinusoidal target magnetomotive force distribution. The upper and lower element edge pairing module is used to place the upper element edge and the lower element edge in each slot, and pair them across slots according to the pitch, and calculate the total magnetomotive force of each slot; The differentiated turns single-phase winding module is used to reproduce the magnetomotive force of the original multi-phase winding through single-phase electricity.

[0009] The second technical solution adopted in this invention is: a parameter design method for a high power density winding structure, comprising the following steps: Determine the number of slots and pole pairs of the motor, select the number of phases of the motor, and calculate the slot pitch electrical angle of the motor. Obtain the instantaneous values ​​of the current in each phase of the motor and calculate the electrical angle of a single slot by combining the electrical angle of the slot pitch of the motor, and determine the phase to which the upper element side and the lower element side of a single slot of the motor belong. Based on the instantaneous values ​​of the current in each phase of the motor, the phase to which the upper element side and the lower element side of a single slot of the motor belong, the combined magnetomotive force of a single slot of the motor is calculated, and the actual integer number of turns of a single slot of the motor is determined by replacing the original multi-phase winding of the motor with a single-phase winding.

[0010] Furthermore, the step of determining the number of slots and pole pairs of the motor, selecting the number of phases of the motor, and calculating the slot pitch electrical angle of the motor specifically includes: Determine the number of slots and pole pairs of the motor, and in conjunction with preset conditions, determine the number of phases of the motor; The slot pitch electrical angle of the motor is obtained by calculating the number of slots and pole pairs of the motor.

[0011] Furthermore, the preset conditions specifically include: The ratio of the number of slots to the number of phases in a motor is a positive integer; After reducing the number of slots per pole and per phase of the motor to its simplest fraction, the denominator of the fraction satisfies the coprime constraint with the number of phases of the motor.

[0012] Furthermore, the step of obtaining the instantaneous values ​​of the current in each phase of the motor and calculating the electrical angle of a single slot in conjunction with the slot pitch electrical angle of the motor to determine the phase to which the upper component side of a single slot of the motor belongs and the phase to which the lower component side of a single slot of the motor belongs specifically includes: Determine the phase difference of the current in each phase winding of the motor, and calculate the instantaneous value of the current in each phase of the motor using the cosine function; Based on the number of slots and pole pairs of the motor, the electrical angle under each pole of the motor is divided into several phase bands on an average basis, and the electrical angle of a single slot is calculated by combining the electrical angle of the slot pitch of the motor to obtain several electrical angles of a single slot of the motor. Based on the phase band range into which the electrical angles of several single slots of the motor fall, determine the phase to which the upper component side of a single slot of the motor belongs; Obtain the ratio of the number of slots to the number of pole pairs of the motor, determine the winding pitch of the motor, and determine the phase to which the lower element side of a single slot of the motor belongs based on the winding pitch of the motor.

[0013] Furthermore, the expressions for the instantaneous values ​​of each phase current of the motor are as follows: In the above formula, This represents the instantaneous value of the current in each phase of the motor. This indicates the amplitude of the single-phase alternating current in the motor. Indicates the number of phases of the motor. Indicates the first of the motor Mutually.

[0014] Furthermore, the expressions for the electrical angles of several single slots of the motor are as follows: In the above formula, This indicates the electrical angle of each slot in the motor. Indicates the electrical angle of the slot pitch. Indicates the stator slot number, This indicates the modulo operation.

[0015] Furthermore, the step of calculating the combined magnetomotive force of a single slot of the motor based on the instantaneous values ​​of the currents in each phase of the motor, the phase to which the upper element side and the lower element side of the single slot belong, and determining the actual integer number of turns of a single slot of the motor by replacing the original multi-phase windings of the motor with single-phase windings, specifically includes: Define the positive direction of all currents in the motor as from the bottom of the slot to the top of the slot. Combine the phase to which the upper element belongs, the phase to which the lower element belongs, and the instantaneous values ​​of the currents in each phase of the motor to determine the magnetomotive force generated by the element at the top of the slot and the element at the bottom of the slot. The combined magnetomotive force of a single slot of the motor is obtained by summing the magnetomotive force generated by the top element and the bottom element. The initial number of slot turns of the equivalent single-phase winding is determined by replacing the original multi-phase winding of the motor with a single-phase winding and inputting a single-phase AC current of the same amplitude. The initial slot turns of the equivalent single-phase winding are rearranged by selecting a starting point and satisfying a preset symmetry condition to obtain a symmetrical turn sequence. Multiply the symmetric turn sequence by a preset common coefficient to obtain the actual integer number of turns per slot of the motor.

[0016] Furthermore, the preset symmetry condition is that the number of symmetrical turns in the k-th slot is equal to the number of symmetrical turns in the n-th slot, where n is the total number of slots in the motor + 1 - k.

[0017] Furthermore, the specific expression for the synthesized magnetomotive force of a single slot of the motor is as follows: In the above formula, This represents the resultant magnetomotive force of a single slot in the motor. This indicates the number of turns in each coil. , These represent the instantaneous current values ​​of the phases belonging to the top and bottom elements of the slot under the same positive direction.

[0018] The beneficial effects of the structural and parameter design method of this invention are as follows: Firstly, by rationally matching the upper and lower component sides, this invention directly retains the harmonic suppression effect of the original multiphase winding in the calculation of the synthetic magnetomotive force. Therefore, after the final single-phase winding is energized with single-phase AC, the harmonic content of its pulsating magnetic field is equivalent to that of the original multiphase winding, and the electromagnetic performance is equivalent. The vibration suppression effect is not reduced due to structural simplification. Furthermore, the synthetic magnetomotive force distribution of the traditional multiphase winding is equivalently converted into a single-phase winding with different turns per slot. Under the premise of the same magnetomotive force output, the winding volume can be effectively reduced, the weight can be reduced, and the power density of the motor can be increased. By adopting a high-power-density winding structure with different turns per slot, while reducing the amount of copper used and increasing the power density, the equivalent electromagnetic performance of the original multiphase winding can be maintained. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a high power density winding structure according to the present invention; Figure 2 This is a flowchart illustrating the steps of a parameter design method for a high power density winding structure according to the present invention. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. The step numbers in the following embodiments are only for ease of explanation and do not limit the order of the steps. The execution order of each step in the embodiments can be adapted according to the understanding of those skilled in the art.

[0021] Reference Figure 1 This invention provides a high power density winding structure, which includes a stator core base module, a multiphase winding prototype module, an upper and lower element side pairing module, and a single-phase winding module with differentiated turns, wherein: The stator core base module is used to provide a physical mounting carrier for the windings and to conduct magnetic fields. The multiphase winding prototype module is used to generate a low-harmonic, sinusoidal target magnetomotive force distribution. The upper and lower element edge pairing module is used to place the upper element edge and the lower element edge in each slot, and pair them across slots according to the pitch, and calculate the total magnetomotive force of each slot; The differentiated turns single-phase winding module is used to reproduce the magnetomotive force of the original multi-phase winding through single-phase electricity.

[0022] Reference Figure 2 A parameter design method for a high power density winding structure includes the following steps: S100. Determine the number of slots and pole pairs of the motor, select the number of phases of the motor, and calculate the slot pitch electrical angle of the motor. S110. Determine the number of slots and pole pairs of the motor, and determine the number of phases of the motor in combination with preset conditions; In this embodiment, the number of slots of the motor is determined. With extreme logarithms Selecting the number of phases The following conditions must be met: 1) The number of slots per phase is an integer, i.e. It is a positive integer; 2) If the number of slots per pole per phase For non-integer values, in order to obtain symmetrical multiphase windings, the following must also be satisfied: in This represents the greatest common divisor. This condition indicates the number of slots per pole per phase. After simplifying to its simplest form, the denominator must be equal to the phase number. Coprime windings are used to ensure spatial cyclic symmetry of each phase winding and to avoid uneven phase shift.

[0023] S120. Calculate the slot pitch electrical angle of the motor based on the number of slots and pole pairs of the motor.

[0024] In this embodiment, after the parameters are determined, the slot pitch electrical angle is calculated: In the above formula, Indicates the electrical angle of the slot pitch. Indicates the number of slots in the motor. This indicates the number of pole pairs of the motor.

[0025] S200. Obtain the instantaneous values ​​of the current in each phase of the motor and calculate the electrical angle of a single slot in combination with the electrical angle of the slot pitch of the motor to determine the phase to which the upper element side and the lower element side of a single slot of the motor belong. S210. Determine the phase difference of the current in each phase winding of the motor, and calculate the instantaneous value of the current in each phase of the motor using the cosine function. In this embodiment, The phase currents of each phase winding are out of phase in time. The moment when the current of phase A reaches its peak value is taken as the zero point of time, and the initial phase of each phase current is determined by the phase difference between phases.

[0026] Utilizing the even function property of the cosine function, the instantaneous values ​​of the phase currents at t=0 can be simplified as follows: in Corresponding to phase A, This represents the current amplitude.

[0027] S220. Based on the number of slots and pole pairs of the motor, the electrical angle under each pole of the motor is divided into several phase bands on an average basis, and the single slot electrical angle is calculated by combining the slot pitch electrical angle of the motor to obtain several single slot electrical angles of the motor. In this embodiment, based on the number of phases Sum of extreme pairs The electrical angle at each pole Divided into Each phase band, each phase bandwidth Calculate the electrical angle for each slot: in The slot pitch is the electrical angle.

[0028] S230. Based on the phase band range into which the electrical angles of several single slots of the motor fall, determine the phase to which the upper element side of a single slot of the motor belongs. S240. Obtain the ratio of the number of slots to the number of pole pairs of the motor, determine the winding pitch of the motor, and determine the phase to which the lower element side of a single slot of the motor belongs based on the winding pitch of the motor.

[0029] In this embodiment, according to The phase band into which the element falls determines the phase of the element on the upper side of the slot. The phase of the element on the lower side is determined by the pitch. To maximize the fundamental synthesized magnetomotive force, the electrical angle difference between the upper and lower element sides should be approximately [missing information]. The slot number can be determined from the pitch parameter. Rounding determines the value.

[0030] S300. Based on the instantaneous values ​​of the current in each phase of the motor, the phase to which the upper element side and the lower element side of the motor slot belong, calculate the combined magnetomotive force of the motor slot, and determine the actual integer number of turns of the motor slot by replacing the original multi-phase winding with a single-phase winding.

[0031] S310. Define the positive direction of all currents in the motor as from the bottom of the slot to the top of the slot. Combine the phase to which the upper element belongs, the phase to which the lower element belongs, and the instantaneous value of the current in each phase of the motor to determine the magnetomotive force generated by the element at the top of the slot and the element at the bottom of the slot. S320. The combined magnetomotive force of a single slot of the motor is obtained by summing the magnetomotive force generated by the top element and the bottom element. In this embodiment, the positive direction of all currents is defined as from the bottom of the slot to the top of the slot, and the resultant magnetomotive force of each slot is equal to the sum of the magnetomotive force generated by the edge of the element at the top of the slot and the magnetomotive force generated by the edge of the element at the bottom of the slot. in The number of turns for each coil, and These are the instantaneous current values ​​of the phases belonging to the top and bottom elements of the slot, respectively, under the same positive direction.

[0032] S330. Replace the original multiphase winding of the motor with a single-phase winding and input a single-phase AC current of the same amplitude to determine the initial number of slot turns of the equivalent single-phase winding. In this embodiment, a single-phase winding is used instead of the original. Phase windings, with the same amplitude The single-phase alternating current. To ensure the new winding generates the same resultant magnetomotive force as the original system, the first... The number of turns in slot number 1 should be: In the above formula, This indicates the amplitude of a single-phase alternating current. Indicates the first Number of turns in slot number 1.

[0033] S340. The initial number of slot turns of the equivalent single-phase winding is rearranged by selecting a starting point and satisfying the preset symmetry condition to obtain the symmetric turn sequence. S350. Multiply the symmetrical turn sequence by a preset common coefficient to obtain the actual integer number of turns per slot of the motor.

[0034] In this embodiment, By rearranging the starting points to satisfy the symmetry condition. Multiply the symmetric sequence by the common coefficient. (like Rounding to the nearest integer, we get the actual integer number of turns for each slot: When a single-phase winding with this number of turns is wound and a single-phase alternating current is applied, the winding generates a pulsating magnetic field, and its magnetomotive force distribution is consistent with the magnetomotive force distribution of the original multiphase winding at the selected time.

[0035] In summary, the embodiments of the present invention have the following advantages over the prior art: 1) The synthetic magnetomotive force distribution of traditional multiphase windings is equivalently converted into a single-phase winding with different number of turns per slot. Under the premise of the same magnetomotive force output, the winding volume can be effectively reduced, the weight can be reduced, and the power density of the motor can be increased. It is suitable for application scenarios with strict space and weight constraints, such as ships and submarines.

[0036] 2) By rationally matching the upper and lower component sides, the harmonic suppression effect of the original multiphase winding is directly retained in the calculation of the synthesized magnetomotive force. Therefore, after the final single-phase winding is energized with single-phase alternating current, the harmonic content of its pulsating magnetic field is equivalent to that of the original multiphase winding, the electromagnetic performance is equivalent, and the vibration suppression effect is not reduced due to structural simplification.

[0037] 3) The design method of this invention is compatible with winding configurations of any number of slots, pole pairs and phases. The resulting single-phase winding does not require a multi-phase power supply system. The winding process is the same as that of conventional single-phase windings, and the engineering implementation and promotion are easy.

[0038] Therefore, the embodiments of the present invention adopt a high power density winding structure with varying number of turns per slot, which can reduce the amount of copper used and increase the power density while maintaining the equivalent electromagnetic performance of the original multiphase winding.

[0039] Finally, the invention will be explained and illustrated with specific implementation examples: Specific Implementation Example 1: For a pole-log Number of slots The motor was designed with single-phase windings of varying numbers of turns per slot. The specific process and results are shown in Table 1.

[0040] First, based on the number of slots, number of pole pairs, and winding symmetry conditions, a check was performed, and a three-phase configuration was selected to meet the design requirements. The slot pitch electrical angle was then calculated. .

[0041] Taking the moment when the current of phase A reaches its peak value as the zero point of time, the instantaneous values ​​of the currents of each phase are... , , .

[0042] The phase and pitch of the components on each slot are determined according to the 60° phase zone division rule. Depend on Rounding determines the position of the component, and the phase of the component is determined accordingly.

[0043] The positive direction of the current is set to point from the bottom of the slot to the opening of the slot, and the combined magnetomotive force of a single slot is determined. Take the number of turns of the original coil. The calculated combined currents for each slot are as follows: slot 1 is 1.5, slot 2 is -1.5, slot 3 is 0, slot 4 is 1.5, slot 5 is -1.5, slot 6 is 0, slot 7 is 1.5, slot 8 is -1.5, and slot 9 is 0.

[0044] The new scheme takes the absolute value of the number of turns per slot, resulting in the sequence (1.5, 1.5, 0, 1.5, 1.5, 0, 1.5, 1.5, 0). To satisfy the symmetry condition, the sequence is cyclically rearranged, moving the value corresponding to slot 1 to the end of the sequence. Common coefficients are then used. The number of turns is normalized to an integer, resulting in the actual integer number of turns sequence (3, 0, 3, 3, 0, 3, 3, 0, 3).

[0045] When a single-phase winding with the specified number of turns is wound and a single-phase alternating current is applied, its magnetomotive force distribution is consistent with that of the original three-phase winding at the peak of the A-phase current.

[0046] Based on the baseline data without multiplication by K, the total number of turns in the original scheme is 18, while the total number of turns in the embodiment of the present invention is 9. Under the premise that other conditions remain unchanged, the amount of copper used can be reduced by 50%.

[0047] Table 1. Single-phase winding design data for specific embodiment one. Specific Implementation Example 2: For a pole-log Number of slots The motor was designed with single-phase windings of varying numbers of turns per slot. The specific process and results are shown in Table 2.

[0048] First, based on the number of slots, number of pole pairs, and winding symmetry conditions, a five-phase configuration was selected to meet the design requirements. The slot pitch electrical angle was then calculated. Taking the moment when the A-phase current reaches its peak value as time zero, the instantaneous values ​​of the five-phase currents are... , , , , .

[0049] Based on the 36° phase zone division rule, the electrical angle under each pole is divided into five phase zones: A, B, C, D, and E, each with a 180° range. The electrical angle of each slot... ,according to The phase band determines the phase of the upper component. Pitch Depend on Rounding can make the electrical angle of the upper and lower components close to 180°, and the phase of the lower component can be determined accordingly.

[0050] The positive direction of the current is set to point from the bottom of the slot to the opening of the slot, and the combined magnetomotive force of a single slot is determined. Take the number of turns of the original coil. The calculated combined currents for each tank are as follows: 1.81, 0, -1.81, -1.12, 1.12, 1.81, 0, -1.81, -1.12, 1.12.

[0051] Symmetrically transforming it yields (1.12, 1.81, 0, -1.81, -1.12, 1.12, 1.81, 0, -1.81, -1.12). Taking the absolute value and multiplying by the common coefficient... Rounding to the nearest integer, the actual integer number of turns for each slot is (11,18,0,18,11,11,18,0,18,11).

[0052] When a single-phase winding with this number of turns is wound and a single-phase alternating current is applied, the magnetomotive force distribution of the pulsating magnetic field generated by the winding is equivalent to the magnetomotive force distribution of the original five-phase winding at the peak of the A-phase current.

[0053] Based on the baseline data without multiplication by K, the original scheme has a total number of 20 winding turns. The equivalent total number of turns in this embodiment is 11.72. Under the premise that other conditions remain unchanged, the amount of copper used can be reduced by about 41.4%. This value is only a proportional comparison result and is not the actual integer number of turns in engineering.

[0054] Table 2. Single-phase winding design data for specific embodiment two. The content of the above method embodiments is applicable to this structural embodiment. The specific functions implemented in this structural embodiment are the same as those in the above method embodiments, and the beneficial effects achieved are also the same as those achieved in the above method embodiments.

[0055] The preferred embodiments of the present application have been described above with reference to the accompanying drawings, but this is not intended to limit the scope of the embodiments of the present application. Any modifications, equivalent substitutions, and improvements made by those skilled in the art without departing from the scope and substance of the embodiments of the present application shall be within the scope of the embodiments of the present application.

Claims

1. A high power density winding structure, characterized in that, This includes a stator core base module, a multiphase winding prototype module, an upper and lower component side pairing module, and a single-phase winding module with differentiated turns, among which: The stator core base module is used to provide a physical mounting carrier for the windings and to conduct magnetic fields. The multiphase winding prototype module is used to generate a low-harmonic, sinusoidal target magnetomotive force distribution. The upper and lower element edge pairing module is used to place the upper element edge and the lower element edge in each slot, and pair them across slots according to the pitch, and calculate the total magnetomotive force of each slot; The differentiated turns single-phase winding module is used to reproduce the magnetomotive force of the original multi-phase winding through single-phase electricity.

2. A parameter design method for a high power density winding structure as described in claim 1, characterized in that, Includes the following steps: Determine the number of slots and pole pairs of the motor, select the number of phases of the motor, and calculate the slot pitch electrical angle of the motor. Obtain the instantaneous values ​​of the current in each phase of the motor and calculate the electrical angle of a single slot by combining the electrical angle of the slot pitch of the motor, and determine the phase to which the upper element side and the lower element side of a single slot of the motor belong. Based on the instantaneous values ​​of the current in each phase of the motor, the phase to which the upper element side and the lower element side of a single slot of the motor belong, the combined magnetomotive force of a single slot of the motor is calculated, and the actual integer number of turns of a single slot of the motor is determined by replacing the original multi-phase winding of the motor with a single-phase winding.

3. The parameter design method for a high power density winding structure according to claim 2, characterized in that, The steps of determining the number of slots and pole pairs of the motor, selecting the number of phases of the motor, and calculating the slot pitch electrical angle of the motor specifically include: Determine the number of slots and pole pairs of the motor, and in conjunction with preset conditions, determine the number of phases of the motor; The slot pitch electrical angle of the motor is obtained by calculating the number of slots and pole pairs of the motor.

4. The parameter design method for a high power density winding structure according to claim 3, characterized in that, The preset conditions specifically include: The ratio of the number of slots to the number of phases in a motor is a positive integer; After reducing the number of slots per pole and per phase of the motor to its simplest fraction, the denominator of the fraction satisfies the coprime constraint with the number of phases of the motor.

5. The parameter design method for a high power density winding structure according to claim 3, characterized in that, The step of obtaining the instantaneous values ​​of the current in each phase of the motor and calculating the electrical angle of a single slot in combination with the electrical angle of the slot pitch of the motor, to determine the phase to which the upper component side of a single slot of the motor belongs and the phase to which the lower component side of a single slot of the motor belongs, specifically includes: Determine the phase difference of the current in each phase winding of the motor, and calculate the instantaneous value of the current in each phase of the motor using the cosine function; Based on the number of slots and pole pairs of the motor, the electrical angle under each pole of the motor is divided into several phase bands on an average basis, and the electrical angle of a single slot is calculated by combining the electrical angle of the slot pitch of the motor to obtain several electrical angles of a single slot of the motor. Based on the phase band range into which the electrical angles of several single slots of the motor fall, determine the phase to which the upper component side of a single slot of the motor belongs; Obtain the ratio of the number of slots to the number of pole pairs of the motor, determine the winding pitch of the motor, and determine the phase to which the lower element side of a single slot of the motor belongs based on the winding pitch of the motor.

6. The parameter design method for a high power density winding structure according to claim 5, characterized in that, The expressions for the instantaneous values ​​of each phase current of the motor are as follows: In the above formula, This represents the instantaneous value of the current in each phase of the motor. This indicates the amplitude of the single-phase alternating current in the motor. Indicates the number of phases of the motor. Indicates the first of the motor Mutually.

7. The parameter design method for a high power density winding structure according to claim 5, characterized in that, The specific expressions for the electrical angles of several single slots of the motor are as follows: In the above formula, This indicates the electrical angle of each slot in the motor. Indicates the electrical angle of the slot pitch. Indicates the stator slot number, This indicates the modulo operation.

8. The parameter design method for a high power density winding structure according to claim 5, characterized in that, The step of calculating the combined magnetomotive force of a single slot of the motor based on the instantaneous values ​​of the current in each phase of the motor, the phase to which the upper element side and the lower element side of the single slot belong, and determining the actual integer number of turns of a single slot of the motor by replacing the original multi-phase winding with a single-phase winding, specifically includes: Define the positive direction of all currents in the motor as from the bottom of the slot to the top of the slot. Combine the phase to which the upper element belongs, the phase to which the lower element belongs, and the instantaneous values ​​of the currents in each phase of the motor to determine the magnetomotive force generated by the element at the top of the slot and the element at the bottom of the slot. The combined magnetomotive force of a single slot of the motor is obtained by summing the magnetomotive force generated by the top element and the bottom element. The initial number of slot turns of the equivalent single-phase winding is determined by replacing the original multi-phase winding of the motor with a single-phase winding and inputting a single-phase AC current of the same amplitude. The initial slot turns of the equivalent single-phase winding are rearranged by selecting a starting point and satisfying a preset symmetry condition to obtain a symmetrical turn sequence. Multiply the symmetric turn sequence by a preset common coefficient to obtain the actual integer number of turns per slot of the motor.

9. The parameter design method for a high power density winding structure according to claim 8, characterized in that, The preset symmetry condition is that the number of symmetrical turns in the k-th slot is equal to the number of symmetrical turns in the n-th slot, where n is the total number of slots in the motor + 1 - k.

10. The parameter design method for a high power density winding structure according to claim 8, characterized in that, The specific expression for the synthesized magnetomotive force of a single slot of the motor is as follows: In the above formula, This represents the resultant magnetomotive force of a single slot in the motor. This indicates the number of turns in each coil. , These represent the instantaneous current values ​​of the phases belonging to the top and bottom elements of the slot under the same positive direction.

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