A disc-type brushless electric-excitation field modulation motor with a double-row stator structure

Abstract

The present invention discloses a disc-type brushless electric-excitation field modulation motor with a double-row stator structure, comprising: an inner stator and an outer stator distributed radially inside and outside, and a rotor disposed parallel to the tops of the teeth of the inner and outer stators, the rotor being a split salient pole structure without a yoke; the inner stator includes an inner stator core and an excitation winding, the outer stator includes an outer stator core and an armature winding, the excitation winding coils are wound on the inner stator core, and the armature winding coils are wound on the outer stator core; the plane where the rotor is located is parallel to the planes where the tops of the teeth of the inner stator and the outer stator are located, and an air gap is formed between the two planes; the plane of the excitation winding coils is parallel to the plane where the air gap is located, and the armature winding coils are parallel to the plane where the air gap is located. Compared with the traditional single-stator electric-excitation field modulation motor, the disc-type electric-excitation field modulation motor with a double-row stator structure proposed by the present invention can better utilize the radial space inside the stator, thereby improving the power density of the motor.

Description

Technical Field

[0001] The present invention relates to a disc-type brushless electric-excitation field modulation motor with a double-row stator structure, belonging to the technical field of disc-type motor design. Background Art

[0002] The brushless electric-excitation field modulation motor generates torque by using the field modulation principle. Both its stator and rotor are salient-pole structures, and the excitation winding and the armature winding are both located on the stator. Therefore, the brushless electric-excitation field modulation motor has high rotor robustness and can be applied to fields such as wind power generation, electric vehicles, and high-speed motors.

[0003] The magnetic flux direction of the disc-type brushless electric-excitation field modulation is axial. This topological structure is compact and can achieve multiple pole numbers due to its disc-type structure, making it suitable for low-speed and high-torque applications. The traditional disc-type brushless electric-excitation field modulation motor has a hollow structure inside, so the radial space inside the stator cannot be fully utilized, resulting in a low power density. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a disc-type brushless electric-excitation field modulation motor with a double-row stator structure, which fully utilizes the radial space inside the stator, thereby improving the power density of the motor.

[0005] The present invention adopts the following technical solutions to solve the above technical problems:

[0006] A disc-type brushless electric-excitation field modulation motor with a double-row stator structure, comprising: an inner stator, an outer stator, and a rotor, wherein the inner stator and the outer stator are distributed radially inside and outside, the inner stator is nested inside the outer stator, the rotor is arranged parallel to the tops of the teeth of the inner stator and the outer stator, both the inner stator and the outer stator are salient-pole structures, and the rotor is a split salient-pole structure without a yoke;

[0007] The inner stator includes an inner stator core and an excitation winding, the outer stator includes an outer stator core and an armature winding, the excitation winding coils are wound on the inner stator core, and the armature winding coils are wound on the outer stator core; the plane where the rotor is located is parallel to the planes where the tops of the teeth of the inner stator and the outer stator are located, and an air gap is formed between the two planes; the plane of the excitation winding coils is parallel to the plane where the air gap is located, and the armature winding coils are parallel to the plane where the air gap is located.

[0008] As a preferred embodiment of the present invention, the excitation winding coils are composed of concentrated coils connected in series or in parallel, and the armature winding coils are composed of concentrated coils connected in series or in parallel.

[0009] As a preferred embodiment of the present invention, the axial heights of the inner stator core and the outer stator core are the same, and the outer diameter of the inner stator core is smaller than the inner diameter of the outer stator core.

[0010] As a preferred embodiment of the present invention, the number of slots of the inner stator core is the same as that of the outer stator core.

[0011] As a preferred embodiment of the present invention, the width of the outer slot opening of the inner stator core is the same as that of the inner slot opening, and the width of the outer slot opening of the outer stator core is the same as that of the inner slot opening.

[0012] As a preferred embodiment of the present invention, the rotor is connected along the circumference by non-magnetic materials.

[0013] As a preferred embodiment of the present invention, the relationship between the number of rotor poles and the number of inner stator slots or outer stator slots satisfies:

[0014] N r = N s ±1

[0015] Or

[0016] N r = N s ±2

[0017] Wherein, N r is the number of rotor poles, and N s is the number of inner stator slots or outer stator slots.

[0018] Compared with the prior art, the present invention adopts the above technical solutions and has the following technical effects:

[0019] The present invention provides a disk-type brushless electric-excitation field modulation motor with a double-row stator structure. Compared with the existing single-stator disk-type brushless electric-excitation field modulation motor, the power density of the motor proposed by the present invention is improved. Description of the Drawings

[0020] Figure 1 is an exploded view of the structure of a disk-type brushless electric-excitation field modulation motor with a double-row stator structure according to the present invention;

[0021] Figure 2 is a topology diagram of a disk-type brushless electric-excitation field modulation motor with a double-row stator structure according to the present invention;

[0022] Figure 3 is an exploded view of the structure of a traditional single-stator disk-type brushless electric-excitation field modulation motor;

[0023] Figure 4 is a topology diagram of a traditional single-stator disk-type brushless electric-excitation field modulation motor. Detailed Embodiments

[0024] Embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present invention and should not be construed as limiting the present invention.

[0025] As Figure 1 and Figure 2 shown, the present invention proposes a disk-type brushless electric-excitation field modulation motor with a double-row stator structure, including two salient-pole inner stator and outer stator distributed radially inside and outside, and a rotor placed parallel to the tops of the teeth of the two stators.

[0026] The rotor is a split salient-pole structure without a yoke and is connected circumferentially by non-magnetic materials. The plane where the rotor is located is parallel to the planes where the tops of the teeth of the inner stator and the outer stator are located, and an air gap is formed between the two planes. The inner stator includes an inner stator core and an excitation winding, and the outer stator includes an outer stator core and an armature winding. The armature winding coils are wound around the outer stator core and are formed by series or parallel connection of concentrated coils, and the coil plane is parallel to the air-gap plane of the disk-type brushless electric-excitation field modulation motor with a double-row stator structure. The excitation winding coils are wound around the inner stator core and are formed by series or parallel connection of concentrated coils, and the coil plane is also parallel to the air-gap plane.

[0027] The axial heights of the inner stator core and the outer stator core are the same, and the outer diameter of the inner stator is smaller than the inner diameter of the outer stator.

[0028] The number of slots of the inner stator core is the same as that of the outer stator core.

[0029] The width of the outer slot opening of the inner stator core is the same as that of the inner slot opening, and the width of the outer slot opening of the outer stator core is the same as that of the inner slot opening.

[0030] In order to obtain a higher fundamental winding factor, the number of rotor poles N r and the number of stator slots N s should satisfy:

[0031] N r = N s ±1

[0032] Or

[0033] N r = N s ±2

[0034] The following describes the specific implementation of the present invention in detail with specific embodiments.

[0035] This embodiment compares the torque density of a single-stator disc-type brushless electric-excitation field modulation motor with that of a disc-type brushless electric-excitation field modulation motor with a double-row stator structure proposed by the present invention. The axial heights and core outer diameters of the two motors are the same, and only the torque magnitudes of them need to be compared. The topologies of the single-stator disc-type brushless electric-excitation field modulation motor are as shown in Figure 3 and Figure 4 . Their main parameters are listed in Table 1.

[0036] Table 1 Main parameters of single-stator and double-row stator disc-type electric-excitation field modulation motors

[0037] Name Unit Single stator Double-row stator Number of stator slots - 24 12 Number of pole pairs - 10 10 Axial height of the motor mm 56.9 56.9 Outer diameter of the motor core mm 270 270 Current density of the armature winding <![CDATA[A / mm 2 > 3.5 3.5 Current density of the field winding <![CDATA[A / mm 2 > 5 5 Outer stator slot opening width mm 6 10 Inner stator slot opening width mm - 9 Outer stator slot depth mm 44 48 Inner stator slot depth mm 44 48 Single-sided air-gap thickness mm 1 1 Average torque Nm 12.56 17.67

[0038] Under the condition that the outer dimensions and current density of the motors are the same, the average torque of the single-stator disc-type brushless electric-excitation field modulation motor is 12.56 Nm, while the average torque of the double-row stator disc-type brushless electric-excitation field modulation motor proposed by the present invention is 17.67 Nm, and the torque density is increased by 28.92%.

[0039] The above embodiments are only used to illustrate the technical idea of the present invention, and the protection scope of the present invention cannot be limited thereby. Any modification made on the basis of the technical solution according to the technical idea proposed by the present invention falls within the protection scope of the present invention.

Claims

1. A disc-type brushless electric excitation magnetic field modulation motor with a double-row stator structure, characterized in that: include: An inner stator, an outer stator and a rotor, wherein the inner stator and the outer stator are radially distributed inward and outward, the inner stator is nested in the outer stator, the rotor is arranged in parallel at the tops of the inner stator and outer stator teeth, the inner stator and the outer stator are both salient pole structures, and the rotor is a split salient pole structure without a yoke; The inner stator comprises an inner stator core and an excitation winding, the outer stator comprises an outer stator core and an armature winding, the excitation winding coil is wound on the inner stator core, and the armature winding coil is wound on the outer stator core; the plane where the rotor is located is parallel to the plane where the tops of the inner and outer stator teeth are located, and an air gap is formed between the two planes; the plane of the excitation winding coil is parallel to the plane where the air gap is located, and the armature winding coil is parallel to the plane where the air gap is located.

2. The disc-type brushless electric excitation magnetic field modulation motor with a double-row stator structure according to claim 1, characterized in that: The field winding coil is formed by connecting concentrated coils in series or in parallel, and the armature winding coil is formed by connecting concentrated coils in series or in parallel.

3. The disc-type brushless electric excitation magnetic field modulation motor with a double-row stator structure according to claim 1, characterized in that: The inner stator core and the outer stator core have the same axial height, and the outer diameter of the inner stator core is smaller than the inner diameter of the outer stator core.

4. The disc-type brushless electric excitation magnetic field modulation motor with a double-row stator structure according to claim 1, characterized in that: The number of slots of the inner stator core is the same as the number of slots of the outer stator core.

5. The disc-type brushless electric excitation magnetic field modulation motor with a double-row stator structure according to claim 1, characterized in that: The outer slot opening width of the inner stator core is the same as the inner slot opening width, and the outer slot opening width of the outer stator core is the same as the inner slot opening width.

6. The disc-type brushless electric excitation magnetic field modulation motor with a double-row stator structure according to claim 1, characterized in that: The rotor is formed by connecting non-magnetic materials along the circumference.

7. The disc-type brushless electric excitation magnetic field modulation motor with a double-row stator structure according to claim 1, characterized in that: The number of rotor poles and the number of inner stator slots or the number of outer stator slots satisfy: N r =N s ±1 or N r =N s ±2 Among them, N r is the number of rotor poles, N s is the number of inner stator slots or the number of outer stator slots.

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