CN102780374A - Stator punched plate of single-phase direct current brushless motor - Google Patents

Abstract

A stator punched plate of a single-phase direct current brushless motor comprises a stator punched plate body and is characterized in that the inner arc of the stator punched plate body is in a step tooth shape, an asymmetrical continuous arc shape or an eccentric circular arc shape, the circular arc of the inner arc is transited by an offset circular arc, the offset direction is directed to a corresponding stator tooth portion, the radius of the offset circular arc is R, the radius of the stator inner arc before offset is R0, the center of a circle offset circle radius of the offset circular arc is r, the circle center offset angle of the offset circular arc with a central axis serving as a basic reference is alpha, the offset distance of the intersection point between the offset circular arc and the stator tooth central axis of the stator punched plate is e, the relations among the R, the R0, the r, the alpha and the e conform to a cosine law, and the radius of the offset circular arc can be determined. According to the stator punched plate of the single-phase direct current brushless motor, an optimized stator punching inner arc structure is utilized, the flux density distribution in air gaps of the punching structure which is a step tooth shape and a continuous arc shape tooth is rearranged, the flux density transition tends to be even, the starting torque is improved by about 14.48%, the average output torque is improved by 0.6%, the torque pulsation is decreased by 2.1%, the electromagnetic noise and vibration of a motor are improved, and the efficiency of the motor is increased.

Description

The stator punching of single-phase DC brushless motor

Technical field

The present invention relates to a kind of stator punching of single-phase DC brushless motor, be applicable to that mainly fan of refrigerator uses the single-phase DC brushless motor, belong to the optimisation technique of the used stator punching profile of tooth of single-phase DC brushless motor.

Background technology

Traditional stator punching that is used for the single-phase DC brushless motor, the tooth portion of stator punching adopts dissymmetrical structure (ladder profile of tooth or continuous arcuation profile of tooth), and the motor starting torque is provided, and makes motor operation.When stator punching adopted asymmetric ladder tooth-shape structure, when arc section carried out the transition to the ladder section, magnetic energy distributed and undergos mutation in the air gap, and motor-output produces than great fluctuation process, and torque pulsation is up to pact ± 115.42%; And when stator punching adopted continuous arcuation tooth-shape structure directly to replace the ladder profile of tooth, the maximum starting torque of motor (minimal air gap and maximum air gap are poor) was difficult to balance with average output (average size of gaps).Because, quite high for the manufacturing approach and the requirement of stator punching.Person skilled has also been made a series of improvement; Like the Chinese patent document number is that CN202206207U discloses the punching of a kind of permanent-magnet servo motor assembled piece type eccentric stator on April 25th, 2012; It comprises the punching body; It is characterized in that described punching body is assemblied to form by two above sector element stator punchings, the sector element stator punching is provided with the punching groove, and the punching body of forming after the assembly unit of sector element stator punching constitutes enclosed construction with the notch of punching groove; Punching body inner circle is provided with the quantity eccentric arc identical with the rotor number of poles, and the eccentric arc structure is adopted in the sector element stator punching bottom of this structure.It is said, can make permanent-magnet servo motor air gap flux density waveform sineization, reduce the ripple torque, and adopt the punching groove notch of enclosed construction, can reduce the motor cogging torque, thereby reduce the pulsating torque of motor, improve motor performance.But, its complex structure, manufacturing cost is high, and in practice, fails to produce a desired effect.Therefore, be necessary further improvement.

Summary of the invention

The object of the invention aims to provide and a kind ofly can improve air gap flux density distribution situation in the motor; Reduce the motor torque pulsation, improve the motor starting torque, and have simple and reasonable; Design ingenious; Function admirable, the stator punching of convenient and practical single-phase DC brushless motor is to overcome weak point of the prior art.

Press the stator punching of a kind of single-phase DC brushless motor of this purpose design; Comprise stator punching; The inner arc that it is characterized in that stator punching is ladder profile of tooth, asymmetric continuous arcuation or off-centre operation arcuation, and its circular arc adopts the biasing arc transition, and biased direction is pointed to corresponding stator teeth; Wherein setover circular arc radius R with the biasing before stator inner arc radius R ₀, the center of circle biasing radius of circle r of biasing circular arc, biasing circular arc are the angle [alpha] of the center of circle biasing of benchmark with the axis, and the relation between the stator tooth axis intersection point offset distance e of biasing circular arc and stator punching satisfies the cosine law, and can pass through $R=\sqrt{{(R_0+e)}^2+r^2-2r(R_0+e)\×\mathrm{Cos}\left(\mathrm{\α}\right)}$ Confirm the radius of biasing circular arc.

The stator teeth of said stator punching is a dissymmetrical structure, and adopts the biasing arc transition.

The center of circle biasing radius of a circle of said biasing circular arc is r, and the scope of its r is 0.25mm～1.5mm.

Said biasing circular arc is that the angle of the center of circle biasing of benchmark is α with the axis, and the scope of its α is-7.5 °～7.5 °.

The stator tooth axis intersection point offset distance of said biasing circular arc and stator punching is e, and the scope of its e is 0～0.1mm.

Said stator punching is formed in one; And be provided with the punching groove more than six; Adjacent punching groove inner port separates shape for not joining; The inner arc of said stator punching is ladder profile of tooth, asymmetric continuous arcuation or off-centre operation arcuation, and its inner arc quantity is identical with the quantity of rotor number of poles and punching groove.

The present invention adopts and optimizes stator punching inner arc structure; Rerouting ladder profile of tooth and the interior close distribution of magnetic of arcuation profile of tooth punching structure air gap continuously are tending towards evenly the close transition of magnetic, and starting torque improves about 14.48%; Average output torque improves 0.6%; Torque pulsation descends 2.1%, has improved the electromagnetic noise and the vibration of motor, has improved the efficient of motor.Under identical cost, the electric performance of motor is improved, and it has simple and reasonable, design ingenious, function admirable, characteristics such as convenient and practical.

Description of drawings

Fig. 1 is one embodiment of the invention structural representation.

Fig. 2 is a tooth portion of an embodiment structure for amplifying sketch map.

Fig. 3 is an A place structure for amplifying sketch map among Fig. 2.

Fig. 4 is an embodiment stator pole shoes structure for amplifying sketch map.

Embodiment

Below in conjunction with accompanying drawing and embodiment the present invention is further described.

Referring to Fig. 1-Fig. 4, a kind of stator punching of single-phase DC brushless motor comprises stator punching 1; Stator punching 1 is formed in one; And be provided with six punching grooves 5, and adjacent punching groove 5 inner port separate shape for not joining, and the inner arc of stator punching 1 uses 2 transition of biasing circular arc; Its quantity is identical with the quantity of rotor number of poles and punching groove 5, and the biased direction 4 of biasing circular arc 2 is pointed to corresponding stator teeth.

Wherein setover circular arc 2 radius R with the biasing before stator inner arc radius R ₀, the radius r of the center of circle biasing circle 3 of biasing circular arc 2, biasing circular arc 2 is the angle [alpha] of the center of circle biasing of benchmark with the axis, the relation between the stator tooth axis intersection point offset distance e of biasing circular arc 2 and stator punching 1 satisfies the cosine law, and can pass through $R=\sqrt{{(R_0+e)}^2+r^2-2r(R_0+e)\×\mathrm{Cos}\left(\mathrm{\α}\right)}$ Confirm the radius of biasing circular arc 2; And center of circle biasing radius r is 0.25mm～1.5mm, and angle of eccentricity α is-7.5 °～7.5 °, and biasing circular arc 2 is 0～0.1mm with the stator tooth axis intersection point offset distance e of stator punching (1).

When stator punching 1 adopted the ladder tooth-shape structure, said biasing circular arc 2 was the center of circle with the point that center of circle biasing circle 3 radiuses and angle of eccentricity α confirm, biasing circular arc 2 radius Rs can pass through $R=\sqrt{{(R_0+e)}^2+r^2-2r(R_0+e)\×\mathrm{Cos}\left(\mathrm{\α}\right)}$ Calculate.

When stator punching 1 adopts continuous arcuation tooth-shape structure; Transition arc and stator tooth axis intersection point are fixed point; Transition arc by technique scheme biasing ladder tooth-shape structure; Connect the stator pole shoes starting point, with axis intersection point, stator pole shoes terminal point, form the continuous arcuation toothing of biasing circular arc 2.

Above-mentioned is preferred version of the present invention, and those of ordinary skills all drop within protection scope of the present invention its simple modification or transformation.

Claims (6)

1. the stator punching of a single-phase DC brushless motor; Comprise stator punching (1); The inner arc that it is characterized in that stator punching (1) is ladder profile of tooth, asymmetric continuous arcuation or off-centre operation arcuation; Its circular arc adopts the transition of biasing circular arc (2), and biased direction (4) is pointed to corresponding stator teeth; Wherein setover circular arc (2) radius R with the biasing before stator inner arc radius R ₀Center of circle biasing circle (3) radius r of biasing circular arc (2); Biasing circular arc (2) is the angle [alpha] of the center of circle biasing of benchmark with the axis, and the relation between the stator tooth axis intersection point offset distance e of biasing circular arc (2) and stator punching (1) satisfies the cosine law, and can pass through $R=\sqrt{{(R_0+e)}^2+r^2-2r(R_0+e)\×\mathrm{Cos}\left(\mathrm{\α}\right)}$ Confirm the radius of biasing circular arc (2).

2. according to the stator punching of the said single-phase DC brushless motor of claim 1, the stator teeth that it is characterized in that said stator punching (1) is a dissymmetrical structure, and adopts the transition of biasing circular arc (2).

3. according to the stator punching of claim 1 or 2 said single-phase DC brushless motors, it is characterized in that the radius of the center of circle biasing circle (3) of said biasing circular arc (2) is r, the scope of its r is 0.25mm～1.5mm.

4. according to the stator punching of the said single-phase DC brushless motor of claim 3, it is characterized in that said biasing circular arc (2) is that the angle of the center of circle biasing of benchmark is α with the axis, the scope of its α is-7.5 °～7.5 °.

5. according to the stator punching of the said single-phase DC brushless motor of claim 4, it is characterized in that the said biasing circular arc (2) and the stator tooth axis intersection point offset distance of stator punching (1) are e, the scope of its e is 0～0.1mm.

6. according to the stator punching of each said single-phase DC brushless motor of claim 1-5; It is characterized in that said stator punching (1) is formed in one; And be provided with the punching groove (5) more than six; Adjacent punching groove (5) inner port separates shape for not joining, and the inner arc of said stator punching (1) is ladder profile of tooth, asymmetric continuous arcuation or off-centre operation arcuation, and its inner arc quantity is identical with the quantity of rotor number of poles and punching groove (5).

Images