CN111064335B - An E-type double-winding stator axial flux motor with amorphous material - Google Patents

Abstract

The invention discloses an E-type double-winding stator axial flux motor based on amorphous materials, which is simple in structure and production process and easy to realize, and the special structure enables the heat dissipation of a winding copper wire to be easier. The novel motor comprises a stator combination part and a rotor part, wherein the stator combination part comprises an E-shaped iron core and a double-winding copper wire, and the rotor part comprises a rotor iron core and a magnet. The stator module is designed by using a double-winding E-shaped iron core, the iron core is made of amorphous materials and is formed by cutting E-shaped thin sheets and laminating, the production process is simple, and the iron loss of the stator is greatly less than that of the traditional silicon steel sheet iron core. Meanwhile, the double-winding design can flexibly adjust the current distribution in the two sets of windings, the running redundancy and reliability of the motor are increased, and the motor can still rely on the other set of windings to realize partial torque output under the condition that one set of windings fails.

Description

An E-type double-winding stator axial flux motor with amorphous material

technical field

The invention relates to an E-type double-winding stator axial magnetic flux motor made of amorphous material, and realizes the design of a low-loss and high-power-density modular motor.

Background technique

Due to space and weight constraints, the motors of electric and hybrid vehicles need to be designed with low loss and high power density. At present, radial permanent magnetic flux motors are mostly used in new energy vehicle motors. Compared with axial flux motors, the torque power density is lower. In addition, the copper wire of the radial flux motor is wrapped in the stator core, which makes it difficult to dissipate heat, and it is difficult to increase the current density, which also leads to the inability to further improve the power density. Therefore, in recent years, major companies and research institutions are also considering the design and application of axial flux motors to further improve the power density of motors for new energy vehicles. Axial-flux motors are also ideal for other applications that require high-power, lightweight motors. Compared with the traditional radial flux motor, the optimized axial flux motor can make electric vehicles and electric motorcycles faster, lighter in weight and larger in power output. Thanks to the enhanced cooling capacity, axial flux motors are more efficient because the coils can be pressed directly into the outer motor housing, cooling faster than radial flux motors, which require cooling via the motor’s stator. Transfer the heat of the coil. The present invention proposes an E-type double-winding stator axial flux motor based on amorphous materials. Compared with the existing axial flux motor, a further modular design is realized, and the heat dissipation area of the copper coil is larger than that of the existing axial flux motor. Flux motors are also larger.

SUMMARY OF THE INVENTION

Technical problem: In order to further improve the power density of the axial flux motor, reduce the overall loss of the motor and simplify the production process, the present invention proposes an E-type double-winding stator axial flux motor based on amorphous materials. The stator of this motor adopts a modular design, and a single module is laminated with an E-type iron core structure. This design can greatly simplify the production and installation process of the stator.

Technical solution: The E-type double-winding stator axial flux motor based on amorphous materials disclosed in the present invention is divided into two parts: a stator assembly and a rotor.

The motor consists of two parts: stator combination I located on the outer periphery and rotor combination II located in the middle; the stator combination is a modular E-type iron core design, including double windings composed of E-type stator iron core and upper winding and lower winding; the stator dual winding can be Using three-phase or multi-phase design, it is wound on the E-type iron core. The rotor combination includes the rotor iron core and the rotor permanent magnet. The rotor magnets are labeled on the upper and lower sides of the rotor iron core, which is similar to the E-type stator iron core. Magnetic circuit combination; stator combination and rotor combination together constitute a three-phase or multi-phase axial flux permanent magnet synchronous motor.

in,

The rotor combination is composed of a rotor iron core and a rotor permanent magnet. The rotor permanent magnet can be of any multi-pole design. When the labels are placed on both sides of the rotor iron core, the structure of the rotor permanent magnets on both sides has the same polarity, which is composed of an E-type stator module. Closed-loop axial flux magnetic circuit.

The E-type stator iron core is cut from an amorphous material into E-type sheets and then laminated.

The rotor permanent magnets are made of NdFeB or other high-performance magnetic materials.

The rotor core can be laminated with amorphous or silicon steel sheets or other high-performance magnetic materials, and the lamination direction is consistent with the stator lamination direction.

In the described E-type dual-winding stator axial flux motor based on amorphous material, the stator and rotor are coupled by axial flux, which is similar to the traditional transformer magnetic circuit coupling. The permanent magnets of the rotor are attached to both sides of the rotor core, and the magnetic poles of the structure are the same. The single-side permanent magnets are alternately designed with N and S. When the rotor rotates, an AC transforming back electromotive force is induced on the stator side windings, which are coupled with the stator winding current to generate motor torque.

The E-type dual-winding stator axial flux motor based on amorphous material, the stator coil adopts dual-winding design, and the two sets of windings can operate independently with power supply, and the thermal balance control of the motor is realized by adjusting the current distribution between the two sets of windings . At the same time, two sets of windings can also increase the operational redundancy and reliability of the motor.

At the same time, the design of the E-type iron core is also for the purpose of using amorphous materials. Amorphous materials are thinner than traditional silicon steel sheets, which can reach 12 μm, and the iron loss is smaller than that of silicon steel sheets. However, amorphous materials are not suitable for conventional stamping processes due to their brittleness, so simple and repetitive stator shapes are required to simplify the machining process. The shape of the E-type iron core is simple, and it can be cut into the desired shape by amorphous material, and then laminated layer by layer. The entire motor stator structure only needs to be combined with the same E-type iron core, and the assembly process is simple. The stator adopts a double-winding design, and the copper wire winding is wound on the E-type iron core. Additional heat dissipation channels can also be designed between the E-type iron core modules. Compared with the traditional axial flux motor, the heat dissipation area is larger, which is more conducive to Increasing the current density in turn increases the power density of the motor. The design of double windings can increase the redundancy and reliability of the motor operation, and at the same time, the thermal balance distribution of the motor can be achieved by adjusting the current distribution between the two sets of windings.

Beneficial effects: Since the motor adopts an E-type-based stator axial magnetic flux structure and uses two sets of independent stator windings, the two layers of permanent magnets in the rotor and the stator form a magnetic circuit like a transformer. Therefore, the E-type dual-winding stator axial flux motor has the following advantages: the motor adopts amorphous material, which has smaller iron loss and improved motor efficiency compared with the traditional motor based on silicon steel sheet. Amorphous materials are brittle and easy to crack. According to this feature, the axial magnetic flux design is adopted. The amorphous material pieces are cut into E-shape and then stacked together. Axial flux motors have the advantage of high power density compared to traditional radial flux motors. In the motor proposed by the invention, the stator is composed of a modular E-type iron core, and the production and assembly process is simple. The double winding is wound on the E-type iron core to increase the operational redundancy of the motor. Additional heat dissipation channels can be added between different E-type iron core modules. Compared with traditional motors, the heat dissipation effect is better, and the power density of the motor can be further increased.

Description of drawings

Figure 1 is a three-dimensional schematic diagram of an E-type dual-winding stator axial flux motor based on amorphous materials;

2 is a top view of an E-type dual-winding stator axial flux motor based on amorphous materials;

3 and 4 are schematic diagrams of the equipment of a single E-type stator and rotor of an E-type double-winding stator axial flux motor based on amorphous materials;

FIG. 5 is a front view and a side view of the rotor combination of an E-type dual-winding stator axial flux motor based on amorphous materials;

Fig. 6 is the E-type iron core assembly drawing of the E-type double-winding stator axial flux motor based on amorphous material;

Fig. 7 is the stator-rotor magnetic circuit coupling diagram of the E-type double-winding stator axial flux motor based on amorphous material;

Among them are: stator combination I, rotor combination II; stator core 1, upper winding 2, lower winding 3, rotor permanent magnet 4, rotor core 5; single-piece E-type core 6.

Detailed ways

The specific implementation of the E-type dual-winding stator axial flux motor made of amorphous material is shown in FIG. 1 , and mainly includes two parts: a stator assembly part I and a rotor part II.

The stator assembly part is shown in Figures 3 and 4. The motor includes two parts: the stator assembly I located on the outer periphery and the rotor assembly II located in the middle; the stator assembly is a modular E-type iron core design, including E-type stator iron core 1 and Double winding composed of upper winding 2 and lower winding 3; the stator double winding can be designed with three-phase or multi-phase, and is wound on the E-type iron core. The rotor combination II includes the rotor iron core 5 and the rotor permanent magnet 4. The rotor magnet is labeled on The upper and lower sides of the rotor iron core and the E-type stator iron core form a magnetic circuit combination similar to a transformer; the stator combination I and the rotor combination II together constitute a three-phase or multi-phase axial flux permanent magnet synchronous motor.

As shown in FIG. 5 , the rotor part is composed of a rotor iron core 5 and a rotor permanent magnet 4 . The rotor combination II is composed of a rotor iron core 5 and a rotor permanent magnet 4. The rotor permanent magnet 4 can be any multi-pole design. When the labels are attached to both sides of the rotor iron core 5, the polarities of the rotor permanent magnet structures on both sides are the same, which is the same as that of the rotor. The E-type stator module constitutes a closed-loop axial flux magnetic circuit.

The E-type double-winding stator axial flux motor of amorphous material adopts E-type stator iron core structure to realize modular design, and the stator can be composed of E-type stator iron core irons of different numbers. The E-type stator core is made of amorphous material, which can reduce the iron loss of the motor.

For the E-type double-winding stator axial flux motor made of amorphous material, the stator is cut into E-type sheets from amorphous material, and then laminated to form an E-type stator module (Fig. 6). The double winding is wound on the outside of the E-type iron core, and the thermal balance control of the motor can be realized by adjusting the current distribution between the two sets of windings. In addition, double winding can also increase the redundancy and reliability of motor operation.

For the E-type dual-winding stator axial flux motor made of amorphous material, the rotor core is made of amorphous material or high-performance silicon steel sheet lamination, and the lamination direction is consistent with the lamination direction of the stator core. The rotor permanent magnets are labeled on both sides of the rotor core, and the structure is consistent. The single-sided permanent magnet adopts the structure of alternating N and S poles, which can generate AC back electromotive force in the stator winding when the motor rotates.

In the described E-type dual-winding stator axial flux motor made of amorphous material, the stator iron core, the windings, the rotor iron core and the permanent magnet form a complete closed-loop magnetic circuit (Fig. 7). The magnetic circuit is in the direction of the axial flux, which has a larger power torque density than the radial flux motor.

The E-type double-winding stator axial flux motor of the amorphous material, the rotor permanent magnets are all high-performance permanent magnets, such as NdFeB, etc., the permanent magnet materials have good stability, large coercivity, and high remanence. , easy to process, and less magnetic flux leakage.

For the asymmetric non-air-gap vortex permanent magnet synchronous motor, the stator can be designed with three-phase or multi-phase windings, and the rotor can be designed with two-pole or multi-pole permanent magnets, but the number of pole pairs of the stator needs to be consistent to achieve synchronization. run.

The E-type double-winding stator axial flux motor made of amorphous material can be applied to new energy and electric vehicles and other applications requiring high power density.

Claims (2)

1. An E-type dual-winding stator axial flux motor based on amorphous materials, characterized in that the motor comprises a stator assembly (I) located on the outer periphery and a rotor assembly (II) located in the middle; the stator assembly is Modular E-type iron core design, including double windings consisting of E-type stator iron core (1) and upper winding (2) and lower winding (3); the stator dual-winding uses a three-phase or multi-phase design and is wound around the E-type iron core On the upper side, the rotor combination (II) includes the rotor iron core (5) and the rotor permanent magnet (4). The rotor magnets are marked on the upper and lower sides of the rotor iron core and form a magnetic circuit combination similar to a transformer with the E-type stator iron core; the stator The combination (I) and the rotor combination (II) together constitute a three-phase or multi-phase axial flux permanent magnet synchronous motor; The rotor assembly (II) includes a rotor iron core (5) and a rotor permanent magnet (4). The rotor permanent magnet (4) is of any multi-pole design. The permanent magnet structure has the same polarity, and forms a closed-loop axial flux magnetic circuit with the E-type stator module; The E-type stator iron core (1) is cut from an amorphous material into E-type sheets (6) and then laminated; The rotor core (5) is formed by laminating amorphous or silicon steel sheets or other high-performance magnetic materials, and the lamination direction is consistent with the stator lamination direction. 2. The E-type dual-winding stator axial flux motor based on amorphous material according to claim 1, characterized in that the rotor permanent magnet (4) is composed of NdFeB or other high-performance magnetic materials.

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