CN103122818A - Stator and motor - Google Patents

Abstract

The invention discloses a stator and a motor, belonging to the field of motors. The curves include: several sections of large circular arcs, several sections of small circular arcs and several sections of transition curves, the several sections of large circular arcs are arranged at equal intervals, the several sections of large circular arcs and the several sections of small circular arcs are alternately arranged at intervals along the circumferential direction, adjacent The large arc and the small arc are connected by a transition curve. The motor has the aforementioned stator. The inner curve of the stator provided by the present invention, the multiple fan-shaped areas surrounded by the diameter difference between the large arc and the small arc, that is, the multiple working oil chambers of the motor, increase the displacement and output torque of the motor, which can meet the current requirements. Mechanical equipment needs to be equipped with a larger displacement motor, and the structure is more compact. The motor described in the present invention has the curved stator, and the motor has a plurality of working oil chambers, which can meet the needs of motors with larger displacement that are required to be matched with current mechanical equipment.

Description

A stator and motor

technical field

The invention relates to the field of motors, in particular to a stator and a motor.

Background technique

Low-speed high-torque vane-type hydraulic motor is used as the actuator of the hydraulic system. Due to its low speed, it can be directly connected to the working mechanism without installing a reduction device, which greatly simplifies the transmission. Therefore, it is widely used in marine machinery and ore machinery.

The low-speed high-torque vane hydraulic motor includes: stator, rotor, vane and pre-tension spring. In the cavity surrounded by the stator, the vanes are arranged radially along the rotor, and the root of the vane is equipped with a pre-tension spring to ensure the motor starts. When the vane is close to the curved surface of the stator, it can ensure that the motor can start and run normally after the pressure oil is introduced. The curves of the inner surface of the existing vane motor stator are mostly composed of four sections of arcs and four transition curves connecting the four sections of arcs. This curve cooperates with the vanes to divide the space inside the stator into two working oil chambers. The arc segment includes two segments of large symmetrical arcs with a radius of R and two segments of symmetrical small arcs with a radius of r.

In the process of realizing the present invention, the inventor finds that there are at least the following problems in the prior art:

When the pressure difference between the front and back of the vane is constant, the output torque of the vane hydraulic motor is determined by the displacement of the motor. Increasing the displacement of the motor can be solved by increasing the difference between R and r in the inner surface curve of the stator, that is, increasing the lift R-r. Hollow phenomenon on the inner surface of the stator.

Contents of the invention

In order to improve the displacement and output torque of the motor, an embodiment of the present invention provides a stator and a motor. Described technical scheme is as follows:

On the one hand, the present invention provides a stator, the inner surface of the stator is a curve, and the curve includes: several sections of large circular arcs, several sections of small circular arcs and several sections of transition curves, the number of the small circular arcs is the same as that of the large circle The sum of the number of arcs and the number of small arcs, the several sections of large arcs and the several sections of small arcs are alternately arranged at intervals along the circumference, and the adjacent large arcs and small arcs pass through a section of the transition Curved connections.

Preferably, the large arc has three segments, the small arc has three segments, and the transition curve has six segments.

Specifically, the three large arcs and the three small arcs are all concentric arcs.

Specifically, arc lengths of the three large arcs are equal, and arc lengths of the three small arcs are equal.

Specifically, the six sections of the transition curve are respectively tangent to the three sections of the large arc and the three sections of the small arc.

Specifically, the transition curve is a constant acceleration and constant deceleration curve.

Specifically, the transition curve is formed according to the following formula:

为所述三段大圆弧和所述三段小圆弧的圆心角，所述α为所述六段过渡曲线的圆心角Wherein, the R is the radius of the three large arcs, the r is the radius of the three small arcs, and the

is the central angle of the three large arcs and the three small arcs, and the α is the central angle of the six transition curves

Further, the central angle of the transition curve is smaller than the central angle of the large circular arc.

Further, the central angle of the transition curve is 36°, and the central angle of the large circular arc is 24°.

In another aspect, the present invention provides a motor, including a stator, blades arranged in the stator, a rotor and a spring, the stator is the above-mentioned stator, the blades are arranged along the circumference of the rotor, and the The vane extends outward along the radial direction of the rotor, the spring is arranged at the joint between one end of the vane and the rotor, and the other end of the vane is in close contact with the inner surface of the stator.

The beneficial effect brought by the technical solution provided by the embodiment of the present invention is: the inner curve of the stator provided by the embodiment of the present invention is formed by connecting several sections of large circular arcs, several sections of small circular arcs and several sections of transition curves, wherein the two ends of the large circular arc The difference between the fan-shaped area formed by the circle center and the two end points of the small arc to the circle center is the multiple working oil chambers of the motor. Compared with the inner curve of the stator that can form two working oil chambers, the present invention can increase the displacement and output torque of the motor, can meet the needs of motors with larger displacements that need to be matched with current mechanical equipment, and has a more compact structure.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained based on these drawings without creative effort.

Fig. 1 is a schematic diagram of the inner curve structure of the stator provided by Embodiment 1 of the present invention;

Fig. 2 is a schematic structural diagram of a fan-shaped region formed by the inner curve of the stator provided by Embodiment 1 of the present invention.

In the figure: 1-large arc, 2-transition curve, 3-small arc, 4-sector area, R-radius of large arc, r-radius of small arc, α-transition curve from both ends to large The angle between the lines connecting the centers of the arcs, - The central angle of the great arc.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

Embodiment one

The embodiment of the present invention provides a stator, the inner surface of the stator is a curve, as shown in Figures 1 and 2, the curve includes: several sections of large arc 1, several sections of small arc 2 and several sections of transition curve 3, small arc 2 The number of large arcs 1 is equal to the number of large arcs 1, the number of transition curves 3 is the sum of the numbers of large arcs 1 and small arcs 2, several large arcs 1 are arranged at equal intervals, and several small arcs 3 are arranged at equal intervals in several large arcs In the gap between 2, several sections of large arcs 2 and several sections of small arcs 3 are respectively connected by several sections of transition curves 4, wherein, several refers to more than three.

Preferably, in this embodiment, there are three segments of the large arc, three segments of the small arc, and six segments of the transition curve. It should be noted that, in the embodiment of the present invention, the number of large arcs and small arcs is 3, however, in other embodiments, the number may also be 4 or 5, which is not limited here.

Specifically, the three sections of large arcs 1 and the three sections of small arcs 3 are all concentric arcs.

Specifically, the arc lengths of the three large arcs 1 are equal, and the arc lengths of the three small arcs 3 are equal.

Specifically, the six transition curves 2 are respectively tangent to the three large arcs 1 and the three small arcs 3 .

Specifically, the transition curve 2 is preferably a constant acceleration and deceleration curve, and the acceleration of the growth of the vector ρ corresponding to the transition curve 2 is a constant value. The transition curve 2 can also be a high-order stator internal curve or a modified Archimedes spiral stator internal curve.

Specifically, the transition curve 2 is formed according to the following formula:

Among them, R is the radius of the three large arcs 1, r is the radius of the three small arcs 3, where R>r, α is the central angle of the three large arcs 1 and three small arcs 3, and α is the two ends of the six transition curves 2 The angle between the connecting lines to the center of the great arc 1.

大于过渡曲线2的两端到大圆弧1的圆心的连线之间的夹角α，用于减小马达输出扭矩的脉动。Further, the central angle of the large arc 1 and the small arc 3

Greater than the angle α between the two ends of the transition curve 2 and the line connecting the center of the large arc 1, it is used to reduce the pulsation of the motor output torque.

为24°。Further, the angle α between the two ends of the transition curve 2 and the line connecting the center of the large arc 1 is 36°, and the central angle of the large arc 1

is 24°.

In a specific implementation of this embodiment, R and r can take values R=250mm, r=230mm, at this time, the equation of the corresponding stator inner curve is:

In another specific implementation of this embodiment, R and r can also take values R=180mm, r=170mm, at this time, the equation of the corresponding stator inner curve is:

In the stator provided by the embodiment of the present invention, the inner surface of the stator is a curve, and the three fan-shaped areas 4 surrounded by the diameter difference between the large arc and the small arc of the curve, that is, the three working oil chambers of the motor, Under the condition of the same arc diameter, compared with the stator inner curve that can only form two working oil chambers in the prior art, the stator with stator inner curve provided by the present invention can increase the working oil chamber of a motor, resulting in The displacement and output torque of the motor are increased by 1.5 times, which can meet the needs of motors with larger displacement for current mechanical equipment, and the structure is more compact.

Embodiment two

An embodiment of the present invention provides a motor, including a stator, blades disposed in the stator, a rotor and a spring, and the stator is the stator provided in Embodiment 1 of the present invention.

Specifically, the number of blades is 12, the blades are arranged along the circumferential direction of the rotor, and the blades extend outward along the radial direction of the rotor, the spring is arranged at the connection between one end of the blade and the rotor, and the other end of the blade is close to the inside of the stator. On the surface, since the blades output torque at the same time, the output torque ripple of the motor is small. The motor provided by the present invention includes the stator provided in Embodiment 1. The inner curve of the stator provided in Embodiment 1 is three fan-shaped areas 4 surrounded by the diameter differences of three large arcs and three small arcs, that is, the three working oils of the motor. The cavity, whose curve can match the vanes of the motor, divides the space inside the stator into three working oil chambers.

Due to the spring force on the root of the blade, the centrifugal force generated when the blade rotates, and the radial friction between the blade and the rotor, in order to ensure that the motor can start and run normally after the pressure oil is introduced, the resultant force on the blade must be greater than The inertial force generated during the acceleration process of the transition curve, and for the low-speed high-torque vane motor, due to the low speed, the centrifugal force generated by the rotational motion of the vane is small, and the oil film is lubricated between the vane and the rotor, so the friction force is also small , thus, the magnitude of the spring force received by the root of the blade is determined by the magnitude of the acceleration of the transition curve. The acceleration characteristics of the high-order stator internal curve and the modified Archimedes spiral stator internal curve all change, and the maximum values are greater than the constant acceleration and deceleration curves. Therefore, for a low-speed high-torque vane motor, in order to reduce the wear on the top of the vane and the inner surface of the stator, it is more appropriate to use a constant acceleration and deceleration curve for the transition curve of the inner curve of the stator of the motor, which can increase the life of the motor and reduce the wear. The root of the small blade is damaged by fatigue, which overcomes the need for the spring to have a large spring force in order to ensure the good sealing performance of the motor in the prior art, and the periodic alternating load can easily cause the spring to break due to fatigue, so that the blade cannot Leakage occurs due to compression of the inner surface of the stator, resulting in a decrease in the volumetric efficiency of the motor.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection of the present invention. within range.

Claims (10)

1. A kind of stator, the inner surface of described stator is a curve, it is characterized in that, described curve comprises: some section large circular arcs, some section small circular arcs and some section transition curves, the quantity of described small circular arcs is the same as that of described large circular arcs equal in number, the number of transition curves is the sum of the numbers of the large arcs and the small arcs, the several sections of large arcs and the several sections of small arcs are alternately arranged at intervals along the circumferential direction, and the adjacent large arcs The circular arc and the small circular arc are connected by a section of the transition curve. 2 . The stator according to claim 1 , wherein the large arc has three segments, the small arc has three segments, and the transition curve has six segments. 3 . The stator according to claim 2 , wherein the three large arcs and the three small arcs are concentric arcs. 4 . 4. The stator according to claim 3, wherein the arc lengths of the three large arcs are equal, and the arc lengths of the three small arcs are equal. 5 . The stator according to claim 2 , wherein the six sections of transition curves are respectively tangent to the three sections of the large arc and the three sections of the small arc. 6 . The stator according to claim 2 , wherein the transition curves are constant acceleration and deceleration curves. 7. The stator according to claim 6, characterized in that the transition curve is formed according to the following formula:

Wherein, the R is the radius of the three large arcs, the r is the radius of the three small arcs, and the

is the central angle of the three large arcs and the three small arcs, and the α is the angle between the two ends of the transition curve and the line connecting the center of the large arc. 8 . The stator according to claim 7 , wherein the included angle between the two ends of the transition curve and the line connecting the center of the large arc is smaller than the central angle of the large arc. 9. The stator according to claim 8, wherein the included angle between the two ends of the transition curve and the line connecting the center of the large arc is 36°, and the central angle of the large arc is is 24°. 10. A motor, comprising a stator, blades arranged in the stator, a rotor and a spring, characterized in that, the stator is the stator according to any one of claims 1-9, and the blades are arranged along the The circumferential arrangement of the rotor, and the blades extend outward along the radial direction of the rotor, the spring is arranged at the connection between one end of the blade and the rotor, and the other end of the blade is close to the stator of the inner surface.

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