CN100385770C - motor stator - Google Patents

Abstract

The invention provides a stator device of a motor, which is formed by stacking at least one first silicon steel sheet and at least one second silicon steel sheet, wherein the first silicon steel sheet and the second silicon steel sheet are respectively provided with a plurality of polar arms, a polar tooth part is formed at one end of each polar arm, and the polar tooth part is vertical to the extending direction of the polar arms and symmetrically formed with a first end side and a second end side; the first end side of the pole tooth part of the second silicon steel sheet forms a truncated angle, so that the motor rotor is deviated to the second end side relative to a magnetic center of the pole tooth part. The invention is easy to form starting deviation, can elastically adjust the starting deviation angle in a simple mode and can ensure the efficiency of the motor.

Description

motor stator

【Technical field】

The invention relates to a stator device of a motor, in particular to a stator device of a motor which is easy to form a starting deflection.

【Background technique】

The known single-phase or two-phase DC brushless motor, in order to make the rotor easy to start, will try to change the magnetic surface of the silicon steel sheet to generate uneven magnetic force, so as to form a starting offset to avoid the dead angle of rotation when the rotor starts. angle) problem.

FIG. 1 is a schematic diagram showing a conventional method for forming a starting offset of a DC motor. As shown in FIG. 1 , one of the left and right end sides of the pole tooth portion 104 of the stator 100 has a cut surface, so that the distance D between the end side of the pole tooth portion 104 with the cut surface and the rotor 102 is greater than the distance D between the other end side and the rotor 102. spacing d. In this way, uneven magnetic force is generated between the two sides of the pole tooth portion 104 and the rotor 102 due to the difference in reluctance, so as to form a starting deflection. As shown in Figure 2, in addition to producing cut surfaces as shown in Figure 2(a), the conventional method can also be used to produce curved surfaces with unequal sides as shown in Figure 2(b), or to produce segmented surfaces as shown in Figure 2(c) In this way, the distance between the two ends of the pole tooth portion 104 and the rotor 102 is different, so as to achieve the purpose of forming a starting deflection.

However, regardless of forming a tangent surface, an unequal arc surface or a step surface, the conventional method of forming the starting deflection will increase the distance between the magnetic interaction surface of the stator 100 and the rotor 102, so that the magnetic interaction surface of the stator 100 and the rotor 102 will increase after the excitation. The induction between the permanent magnets (not shown) on the rotor 102 is significantly reduced (because the magnetic force is inversely proportional to the square of the distance), resulting in reduced motor torque. In addition, if the distance is poorly controlled, it is very likely to cause poor starting control of the motor.

Furthermore, if the starting deflection angle needs to be adjusted according to the rotational speed, load or starting voltage, the conventional method cannot be adjusted flexibly and the mold needs to be re-opened to manufacture silicon steel sheets with different pitches, which greatly increases the manufacturing cost and time.

【Content of invention】

Therefore, the object of the present invention is to provide a stator device for a motor that is easy to form a starting deflection, which can elastically adjust the starting deflection angle in a simple manner while ensuring motor efficiency, and can completely avoid the problems caused by the conventional starting deflection design. The problem.

Based on the above purpose, the present invention provides a stator device for a motor, which is characterized in that: it is formed by stacking at least one first silicon steel sheet and at least one second silicon steel sheet, and each of the first and second silicon steel sheets has several poles An arm, a pole tooth portion is formed at one end of the pole arm, and the pole tooth portion is perpendicular to the extending direction of the pole arm and symmetrically formed with a first end side and a second end side; the pole tooth portion of the second silicon steel sheet A truncated angle is formed on one end side, so that a magnetic center of the motor rotor relative to the pole teeth of the second silicon steel sheet is biased toward the second end side.

The stator device of the motor is characterized in that: the section of the truncated corner of the second silicon steel sheet is parallel to the extending direction of the pole arm of the second silicon steel sheet.

The stator device of the motor is characterized in that: the second silicon steel sheets formed with the truncated corners are stacked adjacent to each other.

The stator device of the motor is characterized in that: the first silicon steel sheet and the second silicon steel sheet are stacked together, wherein the number of the second silicon steel sheets in the upper half along the stacking direction is different from that of the second silicon steel sheets in the lower half The number of pieces to form an axial magnetic pressure on the motor rotor.

The motor stator device is characterized in that: the magnetic action surface of the motor stator device relative to the motor rotor is formed by the outer peripheral edges of the first silicon steel sheet and the second silicon steel sheet.

The present invention also provides a motor stator device, which is characterized in that it is formed by stacking several silicon steel sheets, each of which has several pole arms, and a pole tooth portion is formed at one end of the pole arms, and each of the silicon steel sheets has a The distance from the center to the outer periphery of the pole tooth portion is the same; one end side of the pole tooth portion of some of the silicon steel sheets is formed with a truncated angle, and the several silicon steel sheets are stacked together along the centerline of the pole arm, so that the pole tooth portion When it is vertically divided into two halves, the areas of the magnetically active surfaces of the two halves are not equal.

The stator device of the motor is characterized in that the section of the truncated corner of the silicon steel sheet is parallel to the extending direction of the pole arm.

The stator device of the motor is characterized in that the part of the silicon steel sheet formed with the truncated corner is stacked adjacently in pairs.

The stator device of the motor is characterized in that: along the stacking direction, the number of silicon steel sheets with truncated corners in the upper half is different from the number of silicon steel sheets with truncated corners in the lower half, so as to form the motor rotor Axial magnetic pressure.

The present invention also provides a motor stator device, which is formed by at least one silicon steel sheet, the silicon steel sheet has a pole arm, and a pole tooth portion is formed at one end of the pole arm, and the outer peripheral edge of the pole tooth portion is at the same distance from the center of the motor stator. Features:

At least one truncated corner, at least one notch or at least one perforation is formed on one end side of the at least one pole tooth portion of the at least one silicon steel sheet.

The stator device of the motor of the present invention has the same distance from the outer periphery of the pole teeth of each silicon steel sheet to the center of the silicon steel sheet, so each silicon steel sheet of the stacked stator structure can maintain the same small gap with the rotor, and can produce a larger gap. Torque and improve motor efficiency.

Furthermore, because the present invention uses two groups of silicon steel sheets to stack the stator device, and the two groups of silicon steel sheets are pre-designed to differ only in the presence or absence of truncated corners, so when the starting deflection angle depends on the rotation speed, load or starting When the voltage is adjusted, the present invention only needs to adjust the quantity of the first silicon steel sheet and the second silicon steel sheet when stacking, and can immediately change the magnetic action area of the two halves to achieve the purpose of elastically adjusting the starting deflection angle, which can obviously save manufacturing The effects of cost and time; and when the number of the second silicon steel sheets with truncated angles in the upper half along the stacking direction is different from the number in the lower half, the upper half of the stacked stator structure can be made The difference between the magnetic force of the upper part and the lower half on the rotor can generate a magnetic pressure on the rotor along the axial direction of the motor, reducing the axial deviation of the rotor when it rotates.

【Description of drawings】

FIG. 1 is a schematic diagram showing a conventional method for forming a starting offset of a DC motor.

Figures 2(a), 2(b) and 2(c) respectively show the schematic diagrams of the conventional ways of forming the starting deflection by making the cut surface, the arc surface or the step surface on the pole teeth.

3( a ) and 3 ( b ) are three-dimensional schematic diagrams showing two groups of silicon steel sheet components constituting the motor stator structure of the present invention.

FIG. 4 is a schematic perspective view showing a motor stator structure formed by stacking the first silicon steel sheet and the second silicon steel sheet according to the present invention.

Fig. 5 is a cross-sectional view taken along line A-A of Fig. 4 .

6(a) and 6(b) are schematic diagrams showing variations of the silicon steel sheet stacking methods of the present invention.

Fig. 7 is a schematic perspective view showing a modification example of the second silicon steel sheet of the present invention.

FIG. 8 is a schematic perspective view showing another embodiment of the second silicon steel sheet of the present invention.

【Detailed ways】

3( a ) and FIG. 3( b ) are three-dimensional schematic diagrams showing two sets of silicon steel sheet components constituting the stator device of the motor of the present invention. The motor stator structure according to the present invention is formed by stacking the first silicon steel sheet 10 and the second silicon steel sheet 20 as shown in the figure. The silicon steel sheet 10 is provided with a central hole 12, and the radial direction of the central hole 12 is provided with four pole arms 14 extending radially for allowing coils (not shown) to be wound thereon, and the pole arms 14 terminate at An enlarged pole tooth portion 16 is formed in a tangential direction perpendicular to its extending direction, and the outer peripheral edge 18 of the pole tooth portion 16 constitutes a magnetic interaction surface induced by the rotor.

The second silicon steel sheet 20 also has a central hole 22, four pole arms 24, and a pole tooth portion 26 formed in a tangential direction. It is the same as the first silicon steel sheet. The difference between the two groups of silicon steel sheets is that among the end sides 26a and 26b formed symmetrically in the polar tooth portion 26 perpendicular to the extending direction of the pole arm 24 of the second silicon steel sheet, a truncated corner is formed on one of the end sides (example is the end side 26a).

In this embodiment, the section of the truncated corner on the end side 26a of the pole tooth portion is parallel to the extending direction of the pole arm 24 for ease of formation, and the size of the truncated corner is not limited and can be elastically adjusted according to actual needs. Furthermore, although the number of the pole arms 14 and 24 is illustrated as four, the number depends entirely on the number of poles of the motor and is not limited.

FIG. 4 is a schematic perspective view showing a motor stator structure 30 formed by stacking the first silicon steel sheet 10 and the second silicon steel sheet 20 according to the present invention.

As shown in Figure 4, according to the motor stator structure 30 of this embodiment, the aforementioned two groups of pre-designed silicon steel sheets are used, and two second silicon steel sheets 20 with truncated corners are stacked on two first silicon steel sheets without truncated corners. On the silicon steel sheet 10, the coil 34 is wound on the pole arm to form. When the two groups of silicon steel sheets are stacked together, the outer peripheral edges 38 of the pole teeth of each silicon steel sheet are superimposed to form a magnetic interaction surface for magnetic interaction with the rotor. Figure 5 is a cross-sectional view obtained along the A-A line of Figure 4, please refer to Figure 5, when viewed from the centerline P of the pole arm along the axial direction of the motor, the stacked pole teeth are vertically divided into two halves, The magnetic active area of the left half I is smaller than the magnetic active area of the right half II because the second silicon steel sheet 20 has a truncated angle, so the magnetic center of the rotor 32 will be as shown in Figure 4, extending from the pole arm center line (P direction) relative to the pole tooth portion 36 toward the right half II (that is, the end side without truncated corners) with a larger magnetic action area to the Q direction to achieve magnetic circuit balance and form a moving deflection angle θ.

Therefore, by the design of the present invention, because the distances from the outer periphery 38 of the pole teeth 36 of each silicon steel sheet to the center of the silicon steel sheet are all the same, each silicon steel sheet of the stacked stator structure can maintain the same small gap with the rotor, and Can generate greater torque and improve motor efficiency.

Furthermore, because the present invention uses two groups of silicon steel sheets to stack the stator structure, and the two groups of silicon steel sheets are pre-designed to differ only in the presence or absence of truncation angles, so when the starting deflection angle θ depends on the speed, load or When the starting voltage is adjusted, the present invention only needs to adjust the quantity of the first silicon steel sheet 10 and the second silicon steel sheet 20 when stacking, and can immediately change the magnetic action area of the left half I and the right half II to elastically adjust the starting bias. The position angle θ does not need to re-open the mold and manufacture silicon steel sheets with different pitches to adjust the start-up deviation angle θ as in the conventional technology. Therefore, according to the design of the present invention, it is highly flexible when adjusting the size of the starting deflection angle, and can obviously obtain the effect of saving manufacturing cost and time.

Furthermore, in the silicon steel sheet stacking method shown in Figure 5, the second silicon steel sheet 20 with truncated corners is stacked on the upper half because of the design that the first silicon steel sheet 10 is stacked on the lower half, so the stacked The magnetic force on the rotor at the bottom of the motor stator structure is greater than that at the top, and can generate a downward magnetic pressure on the rotor along the axial direction of the motor, reducing the possible axial displacement of the rotor. That is, because the present invention uses two groups of silicon steel sheets to stack the stator structure, and the two groups of silicon steel sheets are pre-designed to differ only in the presence or absence of truncated corners, when the second silicon steel sheets with truncated corners are stacked along the edge When the quantity in the upper half of the direction is different from that in the lower half, the magnetic force of the upper half and the lower half of the stacked stator structure on the rotor can be different, and an edge can be generated on the rotor. The amount of magnetic pressure in the axial direction of the motor reduces the axial offset when the rotor rotates.

According to the design of the present invention, the individual numbers and stacking methods of the two groups of silicon steel sheets are not limited at all. It only needs to be able to vertically divide the stacked pole teeth by the center line P of the pole arm. The magnetic active area of half II is not equal to produce the effect of starting deflection angle. As shown in Figure 6, for example, the second silicon steel sheets 20 with truncated corners can be adjacently arranged in pairs as shown in figure (a), or the second silicon steel sheets 20 and the first silicon steel sheets 10 can be arranged as shown in figure (b). Interleaved configurations are available.

Fig. 7 is a schematic perspective view showing a modification example of the second silicon steel sheet of the present invention. As shown in FIG. 7 , the motor stator structure of the present invention can also be formed by stacking the first silicon steel sheet 10 and the second silicon steel sheet 40 . The second silicon steel sheet 40 and the first silicon steel sheet 10 also have a central hole 42, four pole arms 44, and a pole tooth portion 46 formed in a tangential direction. A silicon steel sheet 10 is the same. The difference between the two groups of silicon steel sheets is that a notch 48 is formed on one end side of the pole tooth portion 46 of the silicon steel sheet 40 so that the surface of the end side produces a step difference along the axial direction. Therefore, when two groups of silicon steel sheets are used to stack the stator structure, the number of the first silicon steel sheet 10 and the second silicon steel sheet 40 can be adjusted when stacking, and the left half I and the right half of the stacked stator structure can also be changed. The effect of the present invention that the magnetic action area of the part II is different achieves the purpose of elastically adjusting the starting deflection angle θ. Furthermore, as shown in FIG. 8, the second silicon steel sheet 50 can be designed to form a perforation 58 penetrating through the magnetic action surface at one end side of the pole tooth portion 56, so as to adjust the left and right sides of the pole tooth portion 56 outer periphery. The effect of the magnetic interaction area on the end side.

That is to say, under the design premise that the distance R from the center of the two groups of silicon steel sheets to the outer peripheral edge of the pole teeth is the same, the present invention forms truncated corners, notches, perforations or other similar structures on one end side of one group of silicon steel sheets. The effect of adjusting the magnetic action area on the left and right end sides of the silicon steel sheet is obtained. Therefore, when the two groups of silicon steel sheets are used to stack the stator structure, the magnetic interaction area of the left half and the right half of the stacked stator structure can be easily achieved while maintaining the same gap with the rotor. Of course, the position and quantity of the truncated corners, notches, and perforated structures are not limited, and can be changed according to actual needs.

The above descriptions are only examples, not intended to limit the protection scope of the present invention. Any equivalent modification or change made according to the present invention shall be included in the protection scope of the present invention.

Claims (10)

1. A stator device for a motor, characterized in that: it is formed by stacking at least one first silicon steel sheet and at least one second silicon steel sheet, and each of the first and second silicon steel sheets has several pole arms. One end of the arm forms a pole tooth portion, and the pole tooth portion is perpendicular to the extending direction of the pole arm and symmetrically formed with a first end side and a second end side; the first end side of the pole tooth portion of the second silicon steel sheet forms a The truncated angle makes the motor rotor deviate to the second end side relative to a magnetic center of the pole teeth of the second silicon steel sheet. 2 . The stator device of a motor as claimed in claim 1 , wherein the section of the truncated corner of the second silicon steel sheet is parallel to the extending direction of the pole arm of the second silicon steel sheet. 3 . 3 . The stator device of a motor according to claim 1 , wherein the second silicon steel sheets formed with the truncated corners are stacked adjacently in pairs. 4 . 4. The stator device of a motor according to claim 1, wherein the first silicon steel sheet and the second silicon steel sheet are stacked together, wherein the number of the second silicon steel sheets in the upper half along the stacking direction is different from that in the lower half The number of the second silicon steel sheets in the upper part is used to form an axial magnetic pressure on the motor rotor. 5 . The motor stator device as claimed in claim 1 , wherein the magnetic action surface of the motor stator device relative to the motor rotor is formed by the outer peripheral edges of the first silicon steel sheet and the second silicon steel sheet. 6 . 6. A stator device for a motor, characterized in that: it is formed by stacking several silicon steel sheets, each of which has several pole arms, and a pole tooth portion is formed at one end of the pole arms, and each of the silicon steel sheets has its center to The distances from the outer peripheral edges of the pole teeth are the same; part of the silicon steel sheets are formed with truncated corners on one end side of the pole teeth, and the several silicon steel sheets are stacked together along the centerline of the pole arm, so that the pole teeth are vertically uniform When divided into two halves, the areas of the magnetically active surfaces of the two halves are not equal. 7 . The stator device of a motor according to claim 6 , wherein a section of the truncated corner of the silicon steel sheet is parallel to the extending direction of the pole arm. 7 . 8 . The stator device of a motor as claimed in claim 6 , wherein the part of the silicon steel sheets formed with the truncated corners are stacked adjacent to each other. 9 . 9. The stator device of a motor as claimed in claim 6, characterized in that: along the stacking direction, wherein the number of silicon steel sheets with truncated corners in the upper half is different from the number of silicon steel sheets with truncated corners in the lower half, To form an axial magnetic pressure on the motor rotor. 10. A stator device for a motor, formed by at least one silicon steel sheet, the silicon steel sheet has a pole arm, and a pole tooth portion is formed at one end of the pole arm, the outer periphery of the pole tooth portion is at the same distance from the center of the motor stator, and it is characterized in that : At least one truncated corner, at least one notch or at least one perforation is formed on one end side of the at least one pole tooth portion of the at least one silicon steel sheet.

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