CN103199664A - Staggered grooved structure low location torque outer rotor permanent-magnet synchronous motor - Google Patents

Abstract

The invention relates to a permanent-magnet synchronous motor with a low positioning moment external rotor of a dislocation slotted structure, and the invention relates to the technical field of permanent-magnet synchronous motors. It is to solve the inherent positioning torque of the existing permanent magnet synchronous motor, which restricts the application range of the permanent magnet synchronous motor in low-speed performance and high-precision position control. The outer rotor of the first outer rotor permanent magnet synchronous motor and the outer rotor of the second outer rotor permanent magnet synchronous motor are coaxially connected in phase; the inner stator of the first outer rotor permanent magnet synchronous motor is synchronous with the second outer rotor permanent magnet The inner stator of the motor is connected with the coaxial line, and the center line of the first slot and the center line of the second slot are dislocated in space on the circumference, and the misalignment angle is 6 degrees to 14 degrees. The invention can effectively reduce the inherent positioning torque of the permanent magnet synchronous motor, and the reduction range is 25%-30% of the fixed positioning torque of the traditional motor, and has the advantages of simple structure and low cost.

Description

Low positioning torque outer rotor permanent magnet synchronous motor with offset slot structure

technical field

The invention relates to the technical field of permanent magnet synchronous motors.

Background technique

The positioning torque is an inherent phenomenon of the permanent magnet synchronous motor. It is the positioning torque that exists in the non-energized state of the permanent magnet synchronous motor and is related to the position. The positioning torque includes hysteresis positioning torque and reluctance positioning torque, mainly due to the stator The existence of cogging makes the motor reluctance uneven.

The positioning torque directly produces fluctuating torque in the direct drive system, which has a great influence, especially on the low-speed performance and high-precision positioning of the position control system, thus restricting the low-speed performance and high-precision position control of the permanent magnet synchronous motor. application range.

Contents of the invention

The purpose of the present invention is to provide a low positioning torque outer rotor permanent magnet synchronous motor with dislocation slotting structure, in order to solve the inherent positioning torque of existing permanent magnet synchronous motors, which restricts the low speed performance and high precision position of permanent magnet synchronous motors The scope of application in the control.

The stated purpose is achieved by the following scheme: the described low detent torque outer rotor permanent magnet synchronous motor with dislocation slotting structure is composed of a first outer rotor permanent magnet synchronous motor and a second outer rotor permanent magnet synchronous motor ;

It is characterized in that the outer rotor of the first outer rotor permanent magnet synchronous motor is coaxially connected with the outer rotor of the second outer rotor permanent magnet synchronous motor; the inner stator of the first outer rotor permanent magnet synchronous motor has two adjacent windings A first slot is opened between them; a second slot is opened between two adjacent windings on the inner stator of the second outer rotor permanent magnet synchronous motor; the width of the opening of the first slot and the second slot is two windings 1/3 or 2/5 of the slot pitch, and the height of the slot is 1/2 or 3/5 of the height of the inner stator armature; the inner stator of the first outer rotor permanent magnet synchronous motor and the second outer rotor permanent magnet synchronous motor The inner stator of the inner stator is connected with the coaxial line, and the center line of the first slot and the center line of the second slot are misaligned in space on the circumference, and the misalignment angle is 6 degrees to 14 degrees.

The invention can effectively reduce the inherent positioning torque of the permanent magnet synchronous motor, and the reduction range is 25%-30% of the fixed positioning torque of the traditional motor, and has the advantages of simple structure and low cost.

Description of drawings

Fig. 1 is a schematic structural view of the present invention; Fig. 2 is a schematic cross-sectional structure schematic diagram of A-A in Fig. 1; Fig. 3 is a schematic cross-sectional structural schematic diagram of B-B in Fig. 1 .

Detailed ways

Specific embodiment one: as shown in Fig. 1, Fig. 2, Fig. 3, it is made up of the first outer rotor permanent magnet synchronous motor 1, the second outer rotor permanent magnet synchronous motor 2;

It is characterized in that the outer rotor 1-1 of the first outer rotor permanent magnet synchronous motor 1 is coaxially connected with the outer rotor 2-1 of the second outer rotor permanent magnet synchronous motor 2; On the inner stator 1-2, there is a first slot 1-3 between two adjacent windings; on the inner stator 2-2 of the second outer rotor permanent magnet synchronous motor 2, there is a first slot between two adjacent windings. Two slots 2-3; the width of the notch of the first slot 1-3 and the second slot 2-3 is 1/3 or 2/5 of the distance between the two winding slots, and the height of the notch is the height of the inner stator armature 1/2 or 3/5; the inner stator 1-2 of the first outer rotor permanent magnet synchronous motor 1 is coaxially connected with the inner stator 2-2 of the second outer rotor permanent magnet synchronous motor 2, and the first The center line of the slot 1-3 and the center line of the second slot 2-3 are space-phase misaligned on the circumference, and the misalignment angle is 6 degrees to 14 degrees.

Specific embodiment two: as shown in Fig. 1, Fig. 2, Fig. 3, the difference between this embodiment and specific embodiment one is that the widths of the openings of the first groove 1-3 and the second groove 2-3 are both 1/3 of the distance between the two winding slots. Other compositions and connections are the same as in the first embodiment.

Specific embodiment three: as shown in Fig. 1, Fig. 2, Fig. 3, the difference between this embodiment and specific embodiment one is that the widths of the openings of the first groove 1-3 and the second groove 2-3 are both 2/5 of the distance between the two winding slots. Other compositions and connections are the same as in the first embodiment.

Specific embodiment four: as shown in Fig. 1, Fig. 2, Fig. 3, the difference between this embodiment and specific embodiment one is that the height of the notches of the first groove 1-3 and the second groove 2-3 is 1/2 of the height of the inner stator armature. Other compositions and connections are the same as in the first embodiment.

Specific embodiment five: as shown in Fig. 1, Fig. 2, Fig. 3, the difference between this embodiment and specific embodiment one is that the height of the notches of the first groove 1-3 and the second groove 2-3 is 3/5 of the height of the inner stator armature. Other compositions and connections are the same as in the first embodiment.

Specific embodiment six: as shown in Figure 1, Figure 2, and Figure 3, the difference between this embodiment and specific embodiment 1 lies in the centerline of the first groove 1-3 and the centerline of the second groove 2-3 The space phase is misaligned on the circumference, and the misalignment angle is 8 degrees. Other compositions and connections are the same as in the first embodiment.

Embodiment 7: As shown in Figure 1, Figure 2, and Figure 3, the difference between this embodiment and Embodiment 1 lies in the centerline of the first groove 1-3 and the centerline of the second groove 2-3 The space phase is misaligned on the circumference, and the misalignment angle is 10 degrees. Other compositions and connections are the same as in the first embodiment.

Embodiment 8: As shown in Figure 1, Figure 2, and Figure 3, the difference between this embodiment and Embodiment 1 lies in the centerline of the first groove 1-3 and the centerline of the second groove 2-3 The space phase is misaligned on the circumference, and the misalignment angle is 12 degrees. Other compositions and connections are the same as in the first embodiment.

Working principle: The positioning torque of the permanent magnet synchronous motor is a torque that exists when the motor is not energized and is related to the position. From the source analysis, it includes hysteresis positioning torque and reluctance positioning torque. The detent torque directly generates fluctuating torque in the direct drive system, which has a great influence on the performance of the motor.

The hysteresis detent torque is produced by the hysteresis effect of the core material. When the rotor permanent magnetic field rotates, the main magnetic flux alternates in the stator core. Due to the hysteresis of the ferromagnetic material, there is a phase shift between the air gap main magnetic flux and the permanent magnet magnetomotive force, resulting in loss. This results in the generation of hysteresis torque. The size of the hysteresis loss is the area of the hysteresis loop of the magnetization cycle, and the corresponding torque is the size of the hysteresis torque.

The reluctance positioning torque is the cogging torque, which is caused by the non-uniform reluctance effect caused by the slotting of the stator core. When the rotor permanent magnet magnetomotive force acts on the uneven reluctance, the reluctance torque is the so-called reluctance detent torque. Obviously, the magnitude of the reluctance positioning torque will vary with the position of the stator cogging. the

The positioning torque of the permanent magnet synchronous motor directly affects the accuracy of the motor and reduces the performance of the permanent magnet synchronous motor. The slotted dislocation structure can effectively reduce the positioning torque of the permanent magnet synchronous motor.

Claims (8)

1. the dislocation notching construction hangs down the location torque outer rotor permanent magnet motor, and it is made up of first outer rotor permanent magnet motor (1), second outer rotor permanent magnet motor (2);

The external rotor (1-1) that it is characterized in that first outer rotor permanent magnet motor (1) is connected with the coaxial same-phase of external rotor (2-1) of second outer rotor permanent magnet motor (2); Wherein have first groove (1-3) between two adjacent windings on the internal stator (1-2) of first outer rotor permanent magnet motor (1); Wherein have second groove (2-3) between two adjacent windings on the internal stator (2-2) of second outer rotor permanent magnet motor (2); The width of the notch of first groove (1-3) and second groove (2-3) all is 1/3 or 2/5 of two slot for winding spacings, and the height of notch is 1/2 or 3/5 of internal stator armature height; The internal stator (1-2) of first outer rotor permanent magnet motor (1) is connected with internal stator (2-2) coaxial line of second outer rotor permanent magnet motor (2), and to make center line space phase shift on circumference of center line and second groove (2-3) of first groove (1-3) on it, dislocation angle be 6 degree～14 degree.

2. dislocation notching construction according to claim 1 hangs down the location torque outer rotor permanent magnet motor, and the width that it is characterized in that the notch of described first groove (1-3) and second groove (2-3) all is 1/3 of two slot for winding spacings.

3. dislocation notching construction according to claim 1 hangs down the location torque outer rotor permanent magnet motor, and the width that it is characterized in that the notch of described first groove (1-3) and second groove (2-3) all is 2/5 of two slot for winding spacings.

4. dislocation notching construction according to claim 1 hangs down the location torque outer rotor permanent magnet motor, and the height that it is characterized in that the notch of described first groove (1-3) and second groove (2-3) is 1/2 of internal stator armature height.

5. dislocation notching construction according to claim 1 hangs down the location torque outer rotor permanent magnet motor, and the height that it is characterized in that the notch of described first groove (1-3) and second groove (2-3) is 3/5 of internal stator armature height.

6. dislocation notching construction according to claim 1 hangs down the location torque outer rotor permanent magnet motor, it is characterized in that center line space phase shift on circumference of center line and second groove (2-3) of described first groove (1-3), and the dislocation angle is 8 degree.

7. dislocation notching construction according to claim 1 hangs down the location torque outer rotor permanent magnet motor, it is characterized in that center line space phase shift on circumference of center line and second groove (2-3) of described first groove (1-3), and the dislocation angle is 10 degree.

8. dislocation notching construction according to claim 1 hangs down the location torque outer rotor permanent magnet motor, it is characterized in that center line space phase shift on circumference of center line and second groove (2-3) of described first groove (1-3), and the dislocation angle is 12 degree.

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