Embedded permanent magnet synchronous motor structure

Abstract

The utility model provides an embedded permanent magnet synchronous motor structure, and relates to the field of motors. The rotor structure comprises a rotor iron core, the rotor iron core rotates in the stator structure, the rotor iron core is provided with a plurality of notches arranged along the axial direction of the rotor iron core in the circumferential direction, the plurality of notches are uniformly and annularly arranged on the side wall of the rotor iron core, and the rotor iron core is fixed on an Ld shaft. The notches are formed in the circumferential direction of the rotor iron core, the inductance of the Lq axis is zero, Lq and Ld are zero at the moment, the program control mode is simplified, meanwhile, the mode that the two magnetic shoes are arranged is adopted, the eddy current loss is reduced, and the heat dissipation effect is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a motor structure, especially relates to a built-in permanent magnet synchronous motor structure. BACKGROUND

[0002] The built-in motor of high rotating speed is more complex in control mode, and the reason is that Lq>Ld, wherein Ld is longitudinal inductance, mainly influences the torque characteristic of the motor, Lq is transverse inductance, mainly influences the rotating speed and electromagnetic torque of the motor, and under the operating state of high rotating speed, the phenomenon of Lq>Ld usually occurs, and the complexity of the control of the motor mainly comes from the particularity of inductance ratio and the change of electromagnetic characteristic, when Lq>Ld, the transverse inductance of the motor is dominant, so that the motor is more susceptible to electromagnetic damping under the operating state of high rotating speed, and the traditional control method (such as vector control) based on Lq / Ld<1 is difficult to cope with the complex demand under high rotating speed, in addition, under the operating state of high rotating speed, the electromagnetic characteristic of the motor changes, the difference between electromagnetic torque and torque is more significant, and the electromagnetic damping effect is more obvious, so that the response speed and stability of the motor are affected.

[0003] In order to simplify the control mode of the motor, the built-in permanent magnet synchronous motor structure is optimized in the application. SUMMARY

[0004] The utility model provides a built-in permanent magnet synchronous motor structure, and the purpose is to optimize the control mode of the motor by changing the structure of the built-in synchronous motor.

[0005] In order to achieve the above purpose, the embodiment of the utility model provides a built-in permanent magnet synchronous motor structure, which comprises:

[0006] Stator structure;

[0007] Rotor structure, comprising a rotor core, the rotor core rotates in the stator structure, the rotor core is provided with a plurality of slots along the axial direction of the rotor core in the circumferential direction, a plurality of slots are evenly arranged on the side wall of the rotor core, and the rotor core is fixed on the Ld shaft.

[0008] Preferably, a plurality of through grooves are arranged on the rotor core, the through grooves penetrate the rotor core along the axial direction of the rotor core, and a plurality of the through grooves are arranged in a ring shape on the end face of the rotor core.

[0009] Preferably, the rotor core is also provided with a plurality of magnetic shoes penetrating the rotor core along the axial direction of the rotor core, two magnetic shoes are arranged between any two adjacent slots, and the two magnetic shoes are arranged in a line.

[0010] Preferably, the shape of the slot is u-shaped in the cross section perpendicular to the axial direction of the rotor core.

[0011] Preferably, the stator structure further comprises a stator core, and the stator coil is wound on the stator core, and the stator core is arranged at the periphery of the rotor core.

[0012] The above scheme of the utility model has the following beneficial effects:

[0013] The application simplifies the program control mode by setting the circumferential direction of the rotor core with the notches, so that the inductance of the Lq axis is 0, at this time, Lq and Ld are both zero, at the same time, the two magnetic tile arrangement modes are adopted, the eddy current loss is reduced, and the heat dissipation effect is improved.

[0014] Other features and advantages of the utility model will be described in detail in the subsequent specific embodiment part. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is an existing embedded permanent magnet synchronous motor;

[0016] Figure 2 It is an improved embedded permanent magnet synchronous motor.

[0017]

Explanation of reference signs

[0018] 1-stator core, 2-rotor core, 3-notch, 4-through slot, 5-magnetic tile. DETAILED DESCRIPTION

[0019] In order to make the technical problems, technical schemes and advantages to be solved by the utility model more clear, specific embodiments will be described in detail below with reference to the drawings.

[0020] As shown in Figure 1 And 2 The embodiment of the utility model provides a kind of embedded permanent magnet synchronous motor structure, including rotor structure and stator structure, wherein rotor structure can rotate in stator structure to realize power output, rotor structure includes rotor core 2, rotor core 2 rotates in stator structure, and power is output by rotor shaft fixedly connected with rotor core 2, a plurality of notches 3 are arranged along the axial direction of rotor core 2 in the circumferential direction of rotor core 2, and a plurality of notches 3 are evenly arranged on the side wall of rotor core 2.

[0021] Further, a plurality of through grooves 4 are arranged on the rotor core 2, the through grooves 4 penetrate the rotor core 2 along the axial direction of the rotor core 2, and from the end surface of the rotor core 2, the plurality of through grooves 4 are arranged in a ring shape on the end surface of the rotor core 2. A plurality of magnetic tiles 5 are further arranged on the rotor core 2, the plurality of magnetic tiles 5 penetrate the rotor core 2 along the axial direction of the rotor core 2, and two magnetic tiles 5 are arranged between two adjacent slot openings 3, and the two magnetic tiles 5 are collinear. From the end surface of the rotor core 2, the two magnetic tiles 5 are on the same straight line and are spaced apart, so that the magnetic tile 5 has a split structure.

[0022] Preferably, from the end surface of the rotor core 2, the shape of the slot opening 3 is u-shaped, and the end surface of the rotor core 2 is a cross section perpendicular to the axial direction of the rotor core 2.

[0023] The foregoing stator structure further comprises a stator core 1, the stator core 1 is provided with a stator coil, and the stator core 1 is arranged outside the rotor core 2.

[0024] In the present application, the structure of the Ld axis is designed as a hollow structure, so that the inductance of the Lq axis is 0, the control mode of Ld=Lq=0 is realized, and thus the program control mode is simplified. In addition, the magnetic tile 5 at the end of the rotor is modified from a conventional integral type to a split type, so that the loss of eddy current is reduced, and heat dissipation is facilitated. Finally, the slot opening 3 is arranged on the outer side of the rotor core 2, and an uneven air gap is generated with the stator core 1, so that the noise is further reduced.

[0025] The above is the preferred embodiment of the present application, and it should be pointed out that for ordinary skilled persons in the technical field, without departing from the principle of the present application, a number of improvements and refinements can be made, and these improvements and refinements should be regarded as the protection range of the present application.

Claims

1. An embedded permanent magnet synchronous motor structure, characterized in that, include: Stator structure; The rotor structure includes a rotor core (2), which rotates within the stator structure. The rotor core (2) has several slots (3) arranged circumferentially along the axial direction of the rotor core (2). The slots (3) are evenly arranged around the sidewall of the rotor core (2). The rotor core (2) is fixed on the Ld shaft.

2. The embedded permanent magnet synchronous motor structure according to claim 1, characterized in that: The rotor core (2) is provided with a plurality of through slots (4), which penetrate the rotor core (2) along the axial direction of the rotor core (2), and the plurality of through slots (4) are arranged in a ring on the end face of the rotor core (2).

3. The embedded permanent magnet synchronous motor structure according to claim 1, characterized in that: The rotor core (2) is also provided with a number of magnetic tiles (5) that penetrate the rotor core (2) along the axial direction of the rotor core (2). Two magnetic tiles (5) are provided between any two adjacent slots (3), and the two magnetic tiles (5) are arranged collinearly.

4. The embedded permanent magnet synchronous motor structure according to claim 1, characterized in that: The slot (3) is U-shaped in cross section perpendicular to the axial direction of the rotor core (2).

5. The embedded permanent magnet synchronous motor structure according to claim 1, characterized in that: The stator structure also includes a stator core (1), on which stator coils are wound, and the stator core (1) is located around the rotor core (2).

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