CN103151885A - Inner rotor permanent-magnet synchronous motor with staggered grooved structure and low positioning force moment - Google Patents

Abstract

The invention relates to a permanent-magnet synchronous motor with a low positioning torque inner 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 inner rotor of the first inner rotor permanent magnet synchronous motor and the inner rotor of the second inner rotor permanent magnet synchronous motor are connected coaxially and in phase; the height of the notch is 1/2 or 3/5 of the height of the outer stator armature; The outer stator of the first inner rotor permanent magnet synchronous motor is coaxially connected with the outer stator of the second inner rotor permanent magnet synchronous motor, and the center line of the first slot and the center line of the second slot are in the spatial phase on the circumference Dislocation, the dislocation angle is 6 degrees to 14 degrees. 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.

Description

Low positioning torque inner 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 inner rotor permanent magnet synchronous motor with dislocation slotting structure. In order to solve the inherent positioning torque of existing permanent magnet synchronous motors, the low speed performance and high precision position of permanent magnet synchronous motors are restricted. The scope of application in the control.

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

The inner rotor of the first inner rotor permanent magnet synchronous motor and the inner rotor of the second inner rotor permanent magnet synchronous motor 2 are coaxially connected in phase; on the outer stator of the first inner rotor permanent magnet synchronous motor, between two adjacent windings A first slot is opened; a second slot is opened between two adjacent windings on the outer stator of the second inner rotor permanent magnet synchronous motor; the width of the opening of the first slot and the second slot is the distance between the two winding slots The height of the notch is 1/2 or 3/5 of the height of the outer stator armature; the outer stator of the first inner rotor permanent magnet synchronous motor and the outer stator of the second inner rotor permanent magnet synchronous motor The 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 inner rotor permanent magnet synchronous motor 1, the second inner rotor permanent magnet synchronous motor 2;

The inner rotor 1-2 of the first inner rotor permanent magnet synchronous motor 1 is coaxially connected with the inner rotor 2-2 of the second inner rotor permanent magnet synchronous motor 2; the outer stator 1 of the first inner rotor permanent magnet synchronous motor 1 -1 has a first slot 1-3 between two adjacent windings; the outer stator 1-2 of the second inner rotor permanent magnet synchronous motor 2 has a second slot 2 between two adjacent windings -3; the width of the first slot 1-3 and the second slot 2-3 are both 1/3 or 2/5 of the distance between the two winding slots, and the height of the slot is 1/2 of the height of the outer stator armature Or 3/5; the outer stator 1-1 of the first inner rotor permanent magnet synchronous motor 1 is coaxially connected with the outer stator 1-2 of the second inner rotor permanent magnet synchronous motor 2, and the upper first slot 1- The center line of 3 and the center line of the second groove 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 outer 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 outer 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. Low positioning torque inner rotor permanent magnet synchronous motor with offset slot structure, which is composed of the first inner rotor permanent magnet synchronous motor (1) and the second inner rotor permanent magnet synchronous motor (2); It is characterized in that the inner rotor (1-2) of the first inner rotor permanent magnet synchronous motor (1) is connected with the inner rotor (2-2) of the second inner rotor permanent magnet synchronous motor (2) coaxially and in phase; the first The outer stator (1-1) of the inner rotor permanent magnet synchronous motor (1) has a first slot (1-3) between two adjacent windings; the outer stator (1-1) of the second inner rotor permanent magnet synchronous motor (2) There is a second slot (2-3) between two adjacent windings on the stator (1-2); the widths of the openings of the first slot (1-3) and the second slot (2-3) are both 1/3 or 2/5 of the distance between the two winding slots, the height of the slot is 1/2 or 3/5 of the height of the outer stator armature; the outer stator (1-1 of the first inner rotor permanent magnet synchronous motor (1) ) is coaxially connected with the outer stator (1-2) of the second inner rotor permanent magnet synchronous motor (2), and makes the center line of the first slot (1-3) and the second slot (2-3) The center line of the center line is misaligned in space on the circumference, and the misalignment angle is 6 degrees to 14 degrees. 2. The low detent torque inner rotor permanent magnet synchronous motor with offset slotting structure according to claim 1, characterized in that the width of the opening of the first slot (1-3) and the second slot (2-3) Both are 1/3 of the spacing between the two winding slots. 3. The low detent torque inner rotor permanent magnet synchronous motor with offset slotting structure according to claim 1, characterized in that the width of the openings of the first slot (1-3) and the second slot (2-3) Both are 2/5 of the spacing between the two winding slots. 4. The low detent torque inner rotor permanent magnet synchronous motor with offset slotting structure according to claim 1, characterized in that the height of the notches of the first slot (1-3) and the second slot (2-3) 1/2 of the height of the outer stator armature. 5. The low detent torque inner rotor permanent magnet synchronous motor with offset slotting structure according to claim 1, characterized in that the height of the notches of the first slot (1-3) and the second slot (2-3) 3/5 of the height of the outer stator armature. 6. The low detent moment inner rotor permanent magnet synchronous motor with offset slotting structure according to claim 1, characterized in that the center line of the first slot (1-3) and the center of the second slot (2-3) The spatial phase of the line is misaligned on the circumference, and the misalignment angle is 8 degrees. 7. The low detent moment inner rotor permanent magnet synchronous motor with offset slotting structure according to claim 1, characterized in that the center line of the first slot (1-3) and the center of the second slot (2-3) The spatial phase of the line is misaligned on the circumference, and the misalignment angle is 10 degrees. 8. The low detent moment inner rotor permanent magnet synchronous motor with offset slotting structure according to claim 1, characterized in that the center line of the first slot (1-3) and the center of the second slot (2-3) The spatial phase of the line is misaligned on the circumference, and the misalignment angle is 12 degrees.

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