CN204408032U - A kind of monodentate gear shaping stator structure of low speed proximal pole groove magneto - Google Patents

Abstract

The utility model relates to a single-tooth slotting stator structure of a low-speed near-pole permanent magnet motor, which belongs to the technical field of electric motors. The rolling direction of the oriented silicon steel sheet coincides with the radial direction of the motor stator, so that the direction of the magnetic field line of the stator coincides with the rolling direction of the oriented silicon steel sheet. The rolling direction (high magnetic permeability direction) is consistent; the saturation operating point can be increased by using the characteristics of good magnetic permeability in the rolling direction of oriented silicon steel sheets, so that the magnetomotive force generated by the stator current increases, thereby improving the stator teeth. The magnetic flux density and the air gap magnetic flux density achieve the purpose of increasing the torque density per unit volume of the motor; the single-tooth forming concentrated winding structure is adopted to effectively improve the slot full rate and further increase the torque density; at the same time, there are oriented silicon steel sheets The magnetic permeability perpendicular to the rolling direction is low, and the magnetic flux leakage at the addendum of the motor is better suppressed, thereby reducing the torque ripple of the motor.

Description

A single-tooth spline stator structure for a low-speed near-pole permanent magnet motor

technical field

The utility model belongs to the technical field of motors, in particular to a single-tooth slotting stator structure of a low-speed near-pole slot permanent magnet motor.

Background technique

The low-speed near-pole permanent magnet torque motor refers to a torque motor that operates at a low speed and has a relatively close number of poles and slots. This type of motor has outstanding advantages such as simple structure, high efficiency, high power density, short winding ends, and low torque ripple. It is widely used in direct drive fields such as industrial equipment automation robots and multi-axis linkage CNC machine tools. Because the applied environment requires the motor to run at a low speed, it is necessary to increase the number of poles when designing the motor. The near-pole slot permanent magnet torque motor adopts the form of fractional slot winding distribution, which effectively solves the problem of increasing the number of poles in the traditional integer slot motor design. But the contradiction of the limited number of slots. At present, the research on permanent magnet torque motors with near-pole slots mainly focuses on the torque optimization design of the motor. It is hoped that the motor can output higher torque in a limited volume, in other words, make it have a higher torque density, and It is hoped that the motor can have low torque fluctuation to ensure the smooth operation of the driven object. However, such traditional motors are usually made of non-oriented silicon steel sheet, which limits the further improvement of its torque performance from the perspective of the magnetic permeability of the material itself.

Contents of the invention

Aiming at the bottleneck problem of the existing technology, the utility model proposes a single-tooth slotting stator structure of a low-speed near-pole slot permanent magnet motor, so as to improve the magnetic flux density of the stator teeth and the air gap magnetic flux density, and suppress the tooth top of the motor. Flux leakage, the purpose of reducing the torque ripple of the motor.

A single-tooth slotting stator structure of a low-speed near-pole permanent magnet motor, the stator structure includes a plurality of oriented silicon steel sheet single-tooth structures and a yoke structure, the yoke structure is arranged on the machine base, and the yoke structure A plurality of grooves are provided, and a protrusion is provided on one side of the inner wall of the groove; the single-tooth structure is arranged along the circumferential direction, and the protrusion is provided on the bottom side of the single-tooth structure to cooperate with the inner protrusion of the groove of the yoke structure Grooves are used to securely connect the single-tooth structure to the yoke structure.

The rolling direction of the single tooth structure is the radial direction of the stator structure.

The single-tooth structure is provided with an armature winding.

The single-tooth structure is formed by laminating single-tooth punches along the axial direction.

The number of grooves in the yoke structure is the same as that in the single tooth structure.

The utility model advantage:

The utility model is a single-tooth slotting stator structure of a low-speed near pole slot permanent magnet motor, the rolling direction of the oriented silicon steel sheet coincides with the radial direction of the motor stator, so that the direction of the stator magnetic force line and the rolling direction of the oriented silicon steel sheet (high conductivity The direction of the magnetic performance is consistent with that of the oriented silicon steel sheet; the saturation operating point can be increased to increase the magnetomotive force generated by the stator current, thereby increasing the magnetic flux density and air gap of the stator teeth. The magnetic flux density achieves the purpose of increasing the torque density per unit volume of the motor; the single-tooth forming concentrated winding structure is adopted to effectively improve the slot full rate and further increase the torque density; at the same time, the oriented silicon steel sheet is perpendicular to the rolling direction The magnetic conductivity is low, and the magnetic flux leakage at the addendum of the motor is better suppressed, thereby reducing the torque ripple of the motor.

Description of drawings

Fig. 1 is a schematic structural view of an outer rotor near pole slot permanent magnet ring torque motor according to an embodiment of the present invention;

Fig. 2 is a schematic diagram of a single-tooth slotting structure of an embodiment of the utility model, wherein, Fig. (a) is a stator structure, Fig. (b) is a yoke structure; Fig. (c) is a single-tooth structure;

Fig. 3 is an orientation and non-orientation silicon steel sheet motor torque waveform diagram of an embodiment of the utility model;

Fig. 4 is a Fourier decomposition schematic diagram of torque fluctuation of two kinds of silicon steel sheet motors according to an embodiment of the utility model, wherein, figure (a) is a schematic diagram of Fourier decomposition of torque fluctuation of oriented silicon steel sheet motor, and figure (b) Schematic diagram of Fourier decomposition of torque fluctuation of non-oriented silicon steel sheet motor.

Detailed ways

A kind of embodiment of the utility model is described further below in conjunction with accompanying drawing.

As shown in Figure 1, it is a schematic diagram of the structure of the outer rotor near pole slot permanent magnet ring torque motor; the utility model adopts a near pole slot permanent magnet torque motor, the number of poles of the motor is close to the number of slots, and the number of slots per pole and phase is approximately equal to 1. The main magnetic flux starts from one magnetic pole, enters the adjacent stator teeth through the air gap, then bypasses the stator winding through the stator yoke, and then returns to the two opposite charging poles adjacent to the original magnetic pole through the adjacent teeth on both sides. Therefore, compared with the traditional integer slot motor, the magnetic circuit of the motor is dominated by the radial magnetic circuit of the teeth, with high magnetic density and long magnetic circuit, while the tangential magnetic circuit of the yoke is short and low magnetic density. Moreover, if the thickness of the yoke is designed according to the knee point saturation of the yoke flux density, the mechanical strength of the yoke is not enough, so the thickness of the yoke needs to be increased; the simulation calculation shows that the flux density of the yoke of this motor is only It can reach one-third of the maximum tooth magnetic density, which provides conditions for the application of oriented silicon steel sheets.

The characteristics of oriented silicon steel sheets are that the magnetic density of oriented silicon steel sheets in the rolling direction can reach 2.0T, the magnetic density in the vertical rolling direction is about 1.4T, and the magnetic density of non-oriented cold-rolled silicon steel sheets is 1.6T. Considering the saturation of silicon steel sheets It can be seen from the characteristics that under high magnetic induction intensity, increasing the magnetic density requires doubling the magnetic field intensity. Therefore, in a motor made of non-oriented silicon steel sheet, the torque density cannot be increased simply by increasing the current.

Based on the above characteristics, the utility model proposes to use oriented silicon steel sheets to make the stator core of the permanent magnet synchronous motor with near-pole slots; Oriented silicon steel sheet single-tooth structure, 4 is the stator armature winding, 5 is the yoke structure;

In the embodiment of the utility model, the single-tooth structure also adopts the piece forming process, and the oriented silicon steel sheet is the processing material, and the rolling direction is the radial direction; as shown in Figure 2 (a), the stator structure includes multiple There are oriented silicon steel sheet single-tooth structures 3 and a yoke structure 5. The yoke structure 5 is arranged on the outside of the base, as shown in Figure 2 (b), the yoke structure is provided with a plurality of grooves, and the above-mentioned There is a protrusion on one side of the inner wall of the groove; as shown in Figure 2 (c), the bottom side of the single-tooth structure is provided with a groove that cooperates with the inner protrusion of the yoke structure groove, so that the single-tooth structure and the yoke The structure is fixedly connected; the number of grooves of the yoke structure is the same as that of the single tooth structure.

In the embodiment of the utility model, 10 steel is selected for the yoke structure, and the stator armature winding 4 is first wound on the single-tooth structure 3 of oriented silicon steel sheets during tooling, and then inserted into the yoke structure 5 .

Taking the motor with 96 slots and 80 poles as an example, the difference in torque performance between the oriented silicon steel sheet and the traditional non-oriented silicon steel sheet is analyzed; the motor adopts the outer rotor structure, and the inner surface of the rotor is installed with surface-mounted permanent magnet poles. The magnetic pole material is NdFeB; the stator is made of oriented silicon steel sheet and non-oriented silicon steel sheet respectively, but the dimensions are consistent, and the effective value of the input sine wave current is 13A.

In the embodiment of the utility model, the specific dimensions of the motor are shown in Table 1:

Table 1

The utility model adopts ANSOFT to carry out the simulation calculation, and the performance comparison of the motor torque of the two steel sheet materials is shown in Table 2:

Table 2

According to the finite element simulation results, it can be seen from Figure 3 that the torque motor using oriented silicon steel sheet shows a higher average torque. Under the same rated power, the average torque of the two motors is 917Nm and 1018Nm, respectively. Oriented silicon steel sheet motor torque up to 11.01%. After calculation, the working point of the motor magnetic flux density of the traditional non-oriented silicon steel sheet material is 1.6T. When the working point of the magnetic flux density of the oriented silicon steel sheet motor is 1.8T, it is 12.5% higher. From the calculation results, the motor The enhancement of the magnetic field linearly increases the average torque of the motor. In addition, the torque ripple of the oriented silicon steel sheet motor is obviously lower than that of the non-oriented silicon steel sheet.

The utility model performs Fourier decomposition on the electromagnetic torque of the motor running under the no-load condition. The torque ripple of the near-pole slot motor mainly contains the 6th and 12th harmonics, and research shows that the magnetic flux leakage at the top of the tooth is the main source of the 6th and 12th harmonics, as shown in Figure 4 (a) and ( As shown in b), the oriented material has a significant suppression effect on these two harmonics.

It can be verified that the application of grain-oriented electrical steel sheets has a significant effect in reducing the magnetic flux leakage at the tooth tip of the near-pole slot permanent magnet torque motor. This will directly reflect the improvement in the electromagnetic torque ripple of the motor.

To sum up, the use of oriented silicon steel sheet as the stator material increases the magnetic flux density per unit volume, which can increase the average output torque of the motor; at the same time, due to the low magnetic permeability of the steel sheet perpendicular to the rolling direction, the tooth tip is suppressed. Flux leakage can reduce torque ripple.

Claims (5)

1. the monodentate gear shaping stator structure of a low speed proximal pole groove magneto, it is characterized in that, this stator structure comprises multiplely has grain-oriented Si steel sheet monodentate structure and yoke portion structure, described yoke portion vibrational power flow is on support, yoke portion vibrational power flow has multiple groove, and above-mentioned groove inner wall side is provided with projection; Described monodentate structure is along the circumferential direction arranged, side, monodentate structure bottom arrange jut have with yoke portion texture grooves inner projection with the use of groove, monodentate structure is fixedly connected with yoke portion structure.

2. the monodentate gear shaping stator structure of low speed proximal pole groove magneto according to claim 1, is characterized in that, the rolling direction of described monodentate structure is stator structure radial direction.

3. the monodentate gear shaping stator structure of low speed proximal pole groove magneto according to claim 1, is characterized in that, described monodentate structure is provided with armature winding.

4. the monodentate gear shaping stator structure of low speed proximal pole groove magneto according to claim 1, it is characterized in that, described monodentate structure is in axial direction laminated by monodentate punching and is formed.

5. the monodentate gear shaping stator structure of low speed proximal pole groove magneto according to claim 1, is characterized in that, described yoke portion texture grooves number is identical with monodentate structure.