CN209805528U - Combined array type outer rotor shaft radial mixed flux permanent magnet motor - Google Patents

Abstract

The utility model discloses a combined array type outer rotor shaft radial mixed magnetic flux permanent magnet motor, which includes an outer rotor of the motor and a stator, wherein: the outer rotor of the motor includes: a rotor disc iron core, a combined array type permanent magnet disc, Radial surface-mounted permanent magnets, bearings, and outer rotor casing; the combined array permanent magnet disk is formed alternately by axially magnetized oblique pole structures, tangentially magnetized concentric sector permanent magnets, and filled soft magnetic materials; The stator includes: a plurality of modular T-shaped stator cores, distributed winding windings, and a rotating shaft; the T-shaped stator core has two axial stator teeth and a radial stator tooth in the middle, respectively corresponding to the distributed winding Two axial coils in the winding and a radial coil in the middle. The combined array type outer rotor shaft radial mixed flux permanent magnet motor in the utility model can increase the slot full rate, improve the utilization rate of the winding end, improve the torque quality, increase the torque and power density, and improve the overall operating efficiency of the motor .

Description

A Combined Array Type Outer Rotor Shaft-Radial Hybrid Flux Permanent Magnet Motor

technical field

The utility model belongs to the technical field of motors, in particular to a combined array type outer rotor shaft radial mixed magnetic flux permanent magnet motor.

Background technique

At present, the commonly used permanent magnet motors are generally divided into two types: radial flux and axial flux permanent magnet motors. However, the utilization rate of the ends of the motor is low, the overall space utilization rate of the motor is not high, and the torque density and power density of the motor are still low. There is room for improvement.

In traditional motor design, the size of the motor is optimized. For example, the radial permanent magnet motor adopts a structure with a large aspect ratio, and the axial permanent magnet motor adopts a structure with a small aspect ratio; technologies such as fractional concentrated windings are used to improve Torque density, but its effect is limited, and the ends of the motor windings are difficult to use, so people seek a more compact motor structure.

Utility model patent 201520407320.9 proposes an axial-radial mixed flux permanent magnet motor, which is characterized in that the motor has an outer rotor structure, and permanent magnets are arranged on both axial sides of the stator core and on the radially outer casing. The magnetic circuit of the motor passes through the casing and is closed with the stator core to form an axial-radial hybrid magnetic circuit. Each stator core is provided with two axial and one radial windings. However, the axial rotors are all surface-mounted permanent magnets with axial magnetization, the air gap magnetic density is relatively low, and the cogging torque is large, which has a certain impact on the motor torque quality, torque density and power density.

Utility model content

Aiming at at least one of the above defects or improvement needs in the prior art, the utility model provides a combined array outer rotor shaft-radial mixed flux permanent magnet motor, which aims to solve the problem of the existing shaft-radial mixed flux permanent magnet motor. Technical problems of poor motor torque quality, low torque density and low power density.

In order to achieve the above purpose, according to one aspect of the present invention, a combined array outer rotor shaft radial mixed flux permanent magnet motor is provided, including the outer rotor and stator of the motor, wherein:

The outer rotor of the motor includes: a rotor disk iron core, a combined array permanent magnet disk, a radial surface-mounted permanent magnet, a bearing, and an outer rotor casing; Composed of permanent magnet discs, the outer end and the outer rotor casing are fixed to rotate together, and the inner end is placed on the stationary shaft shoulder through bearings; the radial surface-mounted permanent magnets are evenly spaced along the circumferential direction and attached to the inner wall of the outer rotor casing ;

The combined array permanent magnet disk is composed of three alternating parts. The first part is an oblique pole structure in which several sector-shaped permanent magnets are inclined in the same direction, and two adjacent oblique-pole sector-shaped permanent magnets are axially magnetized in opposite directions. ; The second part is a number of concentric sector-shaped permanent magnets, and tangentially magnetized; the third part is filled with soft magnetic material between the first part and the second part; The permanent magnets have opposite polarity;

The stator includes: a plurality of modular T-shaped stator cores, distributed windings, and a rotating shaft; the T-shaped stator cores are circumferentially arranged between the stationary rotating shaft and the outer rotor casing, and are fixed on the rotating shaft superior;

The T-shaped stator core has two axial stator teeth and the middle radial stator teeth, which respectively correspond to the two axial coils and the middle radial coil in the distributed winding, which communicate with each other; the two axial The stator teeth and two axial coils are coaxial with the combined array permanent magnet disk of the two rotor disks.

Preferably, the radial surface-mounted permanent magnets are inclined pole structures inclined in the same direction.

Preferably, the T-shaped stator core is made of soft magnetic composite material through powder metallurgy, and the rotor disc core is made of steel.

The above preferred technical features can be combined with each other as long as they do not conflict with each other.

Generally speaking, compared with the prior art, the above technical solution conceived by the utility model has the following beneficial effects:

1. The combined array type outer rotor shaft radial mixed flux permanent magnet motor of the present utility model adopts combined array type permanent magnets, and adopts tangential magnetization to the sector-shaped permanent magnets, and axial magnetization for oblique pole permanent magnets. Then the remaining part is filled with soft magnetic materials, and the halbach array principle is used to increase the sine degree of the air gap magnetic flux and increase the magnetic flux density, thereby increasing the torque and power density of the motor.

2. The price and cost of permanent magnets are high. The combined array type outer rotor shaft radial mixed flux permanent magnet motor of the utility model adopts combined array type permanent magnets and greatly reduces the cost by filling soft magnetic materials.

3. In the combined array type outer rotor shaft radial mixed flux permanent magnet motor of the present invention, the axial combined array type permanent magnet adopts a structure including an axially magnetized oblique pole structure-radial magnetization is not oblique concentric sector permanent magnet-another One-direction axial magnetization oblique pole structure and alternating combination structure filled with soft magnetic materials, the corresponding permanent magnets on the coaxial axis of the two axial rotor disks are opposite in polarity, combined with the radial permanent magnet oblique pole structure can greatly reduce the motor Cogging torque improves torque quality.

4. The combined array outer rotor axial and radial mixed flux permanent magnet motor of the utility model adopts a T-shaped stator core, the axial and radial magnetic fields are fully utilized, the motor has a compact structure, and the power and torque density are greatly improved.

5. The combined array outer rotor shaft radial mixed flux permanent magnet motor of the present invention adopts a modular T-shaped stator core to improve production efficiency and facilitate processing and later operation and maintenance.

6. The combined array type outer rotor shaft radial mixed flux permanent magnet motor of the utility model can not only improve the space utilization rate of the motor, but also improve the torque quality, torque density and system efficiency. The motor can be used for high-end CNC machine tools Electric spindle, robot joint, electric vehicle hub drive and other occasions.

Description of drawings

Fig. 1 is a schematic cross-sectional view of a combined array type outer rotor shaft-radial hybrid flux permanent magnet motor of the present invention;

Fig. 2 is a perspective cross-sectional schematic diagram of a combined array outer rotor shaft-radial mixed flux permanent magnet motor of the present invention;

Fig. 3 is a three-dimensional schematic diagram of the combined array outer rotor shaft radial mixed flux permanent magnet motor of the present invention with the outer rotor casing hidden;

Fig. 4 is an exploded schematic diagram of the combined array outer rotor shaft radial mixed flux permanent magnet motor of the present invention;

Fig. 5 is a schematic diagram of the T-shaped stator core of the combined array type outer rotor shaft radial mixed flux permanent magnet motor of the present invention;

Fig. 6 is a schematic diagram of the distributed winding of the combined array outer rotor shaft-radial hybrid flux permanent magnet motor of the present invention;

Fig. 7 is a schematic diagram of the combination of the T-shaped stator core and the distributed winding of the combined array outer rotor shaft-radial hybrid flux permanent magnet motor of the present invention;

Fig. 8 is a schematic diagram of the combination of the rotor disk iron core and the combined array permanent magnet disk of the combined array type outer rotor shaft radial hybrid flux permanent magnet motor of the present invention;

Fig. 9 is a schematic diagram of the combined array permanent magnet disk and its magnetic flux of the combined array outer rotor shaft radial hybrid flux permanent magnet motor of the present invention.

Detailed ways

In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute conflicts with each other. The utility model will be further described in detail below in conjunction with specific embodiments.

As a preferred embodiment of the present utility model, as shown in Fig. 1-9, the present utility model provides a combined array outer rotor shaft-radial hybrid flux permanent magnet motor, including the motor outer rotor and stator.

As shown in Figures 1-4, the outer rotor of the motor includes: a rotor disk core 6, a combined array permanent magnet disk 5, a radial surface-mounted permanent magnet 2, a bearing 7, and an outer rotor casing 1; as shown in Figure 8 As shown, the two axial rotor disks are composed of a rotor disk iron core 6 and a combined array permanent magnet disk 5. The outer end is fixed to rotate with the outer rotor casing 1, and the inner end is placed on the stationary rotating shaft 8 through a bearing 7. On the shaft shoulder; radial surface-mounted permanent magnets 2 are attached to the inner wall of the outer rotor casing 1 at uniform intervals along the circumferential direction. Preferably, the radial surface-mounted permanent magnet 2 is an oblique pole structure inclined in the same direction.

As shown in Figures 8-9, the combined array permanent magnet disk 5 is composed of three alternating parts. The first part 51 is an oblique structure in which several sector-shaped permanent magnets are inclined to the same direction, and two adjacent oblique sector The permanent magnets are axially magnetized in opposite directions, as shown by X and · in Fig. 9 respectively; shown by the arrow; the third part 53 is filled with soft magnetic material between the first part 51 and the second part 52; closed-loop magnetic flux.

As shown in Figures 1-4, the stator includes: a plurality of modular T-shaped stator cores 3, distributed windings 4, and a rotating shaft 8; the T-shaped stator cores 3 are arranged around the stationary rotating shaft in the circumferential direction 8 and the outer rotor casing 1, the encoder control board 9 is fixed on the rotating shaft 8, and all the modular T-shaped stator cores 3 are fixed on the rotating shaft 8 with bolts through positioning holes.

As shown in Figures 5-7, the T-shaped stator core 3 has two axial stator teeth 31 and a central radial stator tooth 32, corresponding to the two axial coils 41 and the central radial coil 4 wound in the distributed winding 4, respectively. The radial coils 42 communicate with each other; the two axial stator teeth 31 and the two axial coils 41 are coaxial with the combined array permanent magnet disk 5 of the two rotor disks. The rotor disc iron core 6 and the combined array permanent magnet disc 5, the outer rotor casing 1 and the radial surface-mounted permanent magnet 2 are all fixed by adhesive bonding.

T-shaped stator core 3 has two cooling holes in the radial direction to improve the heat dissipation efficiency of the stator, thereby increasing the power density of the motor. There are stator teeth on both sides of the axial direction and one side of the radial direction for distributed Wire winding. The modular T-shaped stator core is adopted, the axial and radial magnetic fields are fully utilized, the motor structure is compact, the power and torque density are greatly improved, the production efficiency is improved, and it is convenient for processing and later operation and maintenance.

As shown in Figure 7, the distributed winding windings 4 are respectively wound on the three teeth of the T-shaped stator core 3, and the winding direction needs to meet the principle: when the current is passed through, the current in the winding is generated according to Ampere's law The direction of the magnetic field line is from the teeth on both sides of the T-shaped stator core, and the middle tooth flows out. When the reverse current is passed, the direction of the magnetic field line is opposite.

In the embodiment of the utility model, the number of T-shaped stator cores, the number of poles of the combined array type permanent magnet disk and the number of poles of the radial surface-mounted permanent magnet are all determined according to the pole slots of the specific motor, and the number of poles of the motor The pole-slot fit is determined by its rotational speed and power frequency.

In the embodiment of the utility model, the complex structure of the T-shaped stator core is made of soft magnetic composite material through powder metallurgy. At the same time, the material has a high resistivity, which can effectively weaken the stator core. Eddy current loss, the rotor disk iron core and the outer rotor casing are made of steel.

As shown in Figures 1-4 and 9, the no-load magnetic flux starts from the N pole of the combined array permanent magnet part of the oblique permanent magnet on the rotor disk iron core on both sides, and enters the axis of the T-shaped stator iron core through the axial air gap. into the stator teeth, and then from the radial stator teeth of the T-shaped stator core through the radial air gap into the radial surface-mounted permanent magnets, and enter the adjacent radial surface-mounted permanent magnets along the circumferential direction in the radial surface-mounted permanent magnets The permanent magnet enters the T-shaped stator iron core through the radial air gap, and returns to the S pole of the permanent magnet S pole of the oblique pole of the combined array permanent magnet on the rotor disk iron core, and passes through the soft magnetic material and the tangential direction in the combined array permanent magnet. The magnetized sector permanent magnet returns to the original oblique sector permanent magnet.

Those skilled in the art can easily understand that the above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements and modifications made within the spirit and principles of the utility model Improvements and the like should all be included within the protection scope of the present utility model.

Claims (3)

1. A combined array type outer rotor shaft radial hybrid flux permanent magnet motor, comprising a motor outer rotor and a stator, is characterized in that: The outer rotor of the motor includes: a rotor disc iron core (6), a combined array permanent magnet disc (5), a radial surface-mounted permanent magnet (2), a bearing (7), an outer rotor casing (1); The two rotor disks are composed of a rotor disk iron core (6) and a combined array permanent magnet disk (5). The outer end and the outer rotor casing (1) are fixed to rotate together, and the inner end is placed on the bearing (7) On the shoulder of the stationary rotating shaft (8); radial surface-mounted permanent magnets (2) are evenly spaced along the circumferential direction and attached to the inner wall of the outer rotor casing (1); The combined array type permanent magnet disk (5) is made up of three parts alternately, and the first part (51) is the oblique pole structure that some sectoral permanent magnets incline to the same direction, and two adjacent oblique sectoral permanent magnets are in the opposite direction. The direction of the axial magnetization; the second part (52) is a number of concentric sector permanent magnets, and tangential magnetization; the third part (53) is filled between the first part (51) and the second part (52) The soft magnetic material of the rotating shaft (8) is opposite in polarity to the corresponding permanent magnets on the coaxial axis of the two rotor disks; The stator includes: a plurality of modular T-shaped stator cores (3), distributed windings (4), and a rotating shaft (8); the T-shaped stator cores (3) are circumferentially arranged around the stationary rotating shaft (8) and the outer rotor casing (1), and fixed on the rotating shaft (8); The T-shaped stator core (3) has two axial stator teeth (31) and the middle radial stator teeth (32), respectively corresponding to the two axial coils (41) wound in the distributed winding (4) And the middle radial coil (42), which communicates with each other; two axial stator teeth (31) and two axial coils (41) are coaxial with the combined array permanent magnet disc (5) of the two rotor discs . 2. The combined array type outer rotor shaft radial hybrid flux permanent magnet motor as claimed in claim 1, characterized in that: The radial surface-mounted permanent magnet (2) is an oblique pole structure inclined to the same direction. 3. The combined array type outer rotor shaft radial hybrid flux permanent magnet motor according to claim 1, characterized in that: The T-shaped stator core (3) is made of soft magnetic composite material through powder metallurgy, and the rotor disc core (6) is made of steel.