Stator segment with symmetrical connecting elements

Abstract

The invention relates to a stator for an electric motor, comprising at least one first toothed arrangement and one second toothed arrangement for receiving a coil winding, respectively. Each tooth-shaped arrangement comprises an arc-shaped first ring section and an arc-shaped second ring section, a connecting device with a first connecting element and a second connecting element is included, the first connecting element is arranged on the first ring section, the second connecting element is arranged on the second ring section, and the second connecting element is arranged on the second ring section. The first connecting element is designed in the form of a protruding projection, the second connecting element is designed in the form of a recess corresponding to the projection, and wherein the ratio of the height to the width of the projection is 1: 1 and the ratio of the height to the width of the base is 2: 1.

Description

Stator segment with symmetrical connecting elements Technical Field

[0001] The present invention relates to a stator for an electric motor (particularly as a drive device for a power tool), the stator comprising at least one first tooth arrangement and a second tooth arrangement for receiving coil windings, respectively. Background Technology

[0002] According to existing technology, the stator, as a component for an electric motor, essentially has a ring element and multiple toothed elements. The toothed elements extend from the circumferential inner surface of the ring element to the center point of the ring element. A circular gap for the rotor is maintained at the free end of the toothed element. Each toothed element is used to receive and hold a winding coil made of conductive coil wire to correspondingly generate a magnetic field.

[0003] Especially with smaller stators, winding individual tooth elements with coil wire typically involves a significant amount of technical effort. The available space between adjacent tooth elements is often narrow, making the rapid and, most importantly, neat winding of the coil around the tooth elements time-consuming, requiring meticulously crafted winding equipment, and incurring high costs. Summary of the Invention

[0004] Therefore, the purpose of this invention is to solve the above-mentioned problems.

[0005] This objective is achieved through the subject matter of independent claim 1.

[0006] Advantageous embodiments of the subject matter of the invention can be found in the dependent claims.

[0007] This objective is achieved in particular by a stator for an electric motor (especially as a drive unit for a power tool), the stator comprising at least one first tooth arrangement and a second tooth arrangement, each of the first tooth arrangement and the second tooth arrangement having a rod element for receiving a radially arranged coil winding.

[0008] According to the present invention, each toothed arrangement includes an arc-shaped first ring segment and a second ring segment, wherein a connecting device having a first connecting element and a second connecting element is provided, wherein the first connecting element is disposed on the first ring segment, the second connecting element is disposed on the second ring segment, and wherein the first connecting element is configured as a protruding protrusion, the second connecting element is in the form of a recess corresponding to the protrusion, and wherein the ratio of the height to the width of the protrusion is 1:1, and the ratio of the height to the base width is 2:1.

[0009] "Cooperation" can also be understood as referring to the precision or accuracy of cooperation.

[0010] According to another advantageous embodiment, it is possible for the ratio of the width of the ring section to the width of the first connecting element to be 3:1.

[0011] According to another advantageous embodiment, the connecting device may include at least one first undercut and a second undercut.

[0012] According to another advantageous embodiment, the compensating element may at least partially comprise a curable material. The curable material may be, for example, a polymer, a synthetic resin, etc.

[0013] According to another advantageous embodiment, it is possible that the first connecting element is positioned at the free end of the arcuate ring section, and the second connecting element is positioned substantially at the first end of the rod element.

[0014] Further advantages will become apparent from the following description of the accompanying drawings, which illustrate various exemplary embodiments of the invention.

[0015] The accompanying drawings, description, and claims contain many combinations of features. Those skilled in the art will also be able to consider these features individually and combine them to produce other useful combinations. Attached Figure Description

[0016] In the accompanying drawings: FIG1 shows a schematic side view of a power tool having a drive device according to an exemplary embodiment; FIG2 shows a perspective side view of a stator and a rotor as part of the drive device; FIG3 shows a perspective side view of a stator having a plurality of toothed arrangements; FIG4 shows a front view of a toothed arrangement having a connecting device according to an exemplary embodiment, the connecting device including a first connecting element and a second connecting element; and FIG5 shows a front view of two adjacent toothed arrangements having a connecting device according to an exemplary embodiment, the connecting device including a first connecting element and a second connecting element. Detailed Implementation

[0017] Figure 1 shows a power tool 1 in the form of a rechargeable battery-operated screwdriver according to an exemplary embodiment.

[0018] Power tool 1 can also be alternatively designed in the form of a hammer drill, combination hammer, power drill, saw, grinder, etc.

[0019] As shown in FIG1, the power tool 1 according to an exemplary embodiment basically includes a housing 2, a tool accessory 3, a handle 4, and a power supply device 5.

[0020] The housing 2 has a top side 2a, a bottom side 2b, a front end 2c, and a rear end 2d.

[0021] Tool accessory 3 for receiving and holding tool 6 is positioned at the front end 2c of housing 2. In the present case, tool 6 is in the form of a screwdriver tip (or simply a tip).

[0022] The handle 4 allows the user (not shown in the attached drawings) to hold and guide the power tool 1. The handle 4 has an upper end 4a, a lower end 4b, a front side 4c, and a rear side 4d. The upper end 4a of the handle 4 is connected to the bottom side 2b of the housing 2 of the power tool 1.

[0023] As can be seen in Figure 1, the actuation switch 7 is located on the front side 4c of the handle 4. The actuation switch 7 is used to activate the power tool 1. The control device 8 of the power tool 1 is located inside the handle 4 and is used to control and adjust the function of the power tool 1.

[0024] A base device 8 having a power tool interface 9 is disposed on the bottom side 2b of the housing 2 of the power tool 1. The power tool interface 9 is used to releasably connect the power tool 1 to the power supply device 5.

[0025] In this embodiment, the power supply device 5 is in the form of a rechargeable battery. According to an alternative embodiment (not shown in the drawings), the power supply device 5 may also be configured as a cable for releasably connecting the power tool 1 to an AC power source (also known as an electrical outlet).

[0026] The housing 2 of the power tool 1 also houses a drive unit 10, a transmission device 11, and a drive shaft 12. In this exemplary embodiment, the drive unit 10 is in the form of an electric motor and is used to generate torque. The drive unit 10, transmission device 11, and drive shaft 12, which are in the form of electric motors, are arranged or positioned relative to each other in the housing 2 in such a way that the torque generated by the drive unit 10 can be transmitted via the transmission device 11 and the drive shaft 12 and ultimately transmitted to the tool accessory 3.

[0027] The drive unit 10 further comprises essentially a stator 13 and a rotor 14, which is positioned in the stator 13 and is rotatable relative to the stator 13, see Figure 2. The rotor 14 rotates about the central axis MA of the stator 13.

[0028] As can be seen in Figures 3 through 5, the stator 13 includes six tooth arrangements 20 according to an exemplary embodiment. According to alternative embodiments, the stator 13 may also include more or fewer than six tooth arrangements 20.

[0029] Each individual toothed arrangement 20 is used to receive a coil winding 15 made of conductive wire. For example, the conductive wire may be made of copper or a copper alloy.

[0030] Each toothed arrangement 20 includes a rod element 16 and an arc-shaped first ring segment 17 and a second ring segment 18. As can be seen in Figures 3 and 4, the individual ring segments 17 and 18 combine to form a closed ring R.

[0031] The rod element 16 has a first end 16a and a second end 16b, and the coil winding 15 is attached between the first end 16a and the second end 16b. The respective first end 16a of the rod element 16 is positioned on the circumferential inner surface of the ring R formed by the respective ring segments 17, 18. The second end 16b of the rod element 16 protrudes to the center point M of the ring R. The length of the rod element 16 is chosen such that a circular recess is retained inside the stator 13. The rotor 14 can be placed in said recess.

[0032] As can be seen in the accompanying drawings, the first ring segment 17 and the second ring segment 18 each have a first end and a second end 17a, 17b, 18a, 18b. The first end 17a of the first ring segment 17 is located at the first end 16a of the rod element 16. The first end 18a of the second ring segment 18 is also located at the first end 16a of the rod element 16. The two ring segments 17 and 18 extend in opposite directions around the ring R.

[0033] Figure 4 shows the toothed arrangement 20 according to the first embodiment; the first ring segment 17 and the second ring segment 18 have arcs KB1 and KB2 of substantially the same length.

[0034] Additionally, each toothed arrangement 20 includes a connecting device 19 having a first connecting element 19a and a second connecting element 19b. The first connecting element 19a is positioned on the first ring segment 17, and the second connecting element 19b is positioned on the second ring segment 18.

[0035] In this exemplary embodiment, the connecting device 19 is configured for engagement connection. The connecting device 19 configured for engagement connection is used to releasably connect the respective ring segments 17, 18, and thus connect the respective toothed arrangements 20 to form a continuous annular stator 13.

[0036] The first connecting element 19a on the first ring segment 17 is configured to be a substantially protruding protrusion. The second connecting element 19b on the second ring segment 18 is further configured to be a recess corresponding to the protrusion, such that the first connecting element 19a can be shaped to engage with the second connecting element 19b.

[0037] In Figure 4, the first connecting element 19a and the second connecting element 19b are shown in a connected state, such that the first ring segment 17 and the second ring segment 18 are connected to each other.

[0038] The ratio of the height H to the width B of the first connecting element 19a, which is configured as a protrusion, is 1:1.

[0039] In addition, the ratio of the height H of the first connecting element 19a, which is configured as protrusion 23, to the base width FB is 2:1.

[0040] In addition, the first connecting element 19a is configured asymmetrically.

[0041] Furthermore, the ratio of the width RB of the annular section of the first connecting element 19a, which is configured as a protrusion, to the width B of the first connecting element 19a is 3:1.

[0042] Additionally, the first connecting element 19a and the second connecting element 19b each have a protrusion 23. Each protrusion 23 extends outward in the radial direction or from the circumferential outer surface of the stator 13. The protrusion 23 on the first connecting element 19a includes a long arc KB3, and the protrusion on the second connecting element 19b includes a short arc KB4. As can be seen in Figure 4, the protrusions 23 of the first connecting element 19a and the second connecting element 19b have side surfaces that extend substantially radially outward.

[0043] The continuous protrusions 23 on the circumferential outer surface of the stator 13 are used for the correct orientation or alignment of the stator 13 during installation.

[0044] Figure Labels

Claims

1. A stator (13) for an electric motor, particularly as a drive unit (10) for a power tool, the stator comprising at least one first tooth arrangement and a second tooth arrangement (20) for receiving coil windings, characterized in that, Each toothed arrangement (20) includes an arc-shaped first ring segment and a second ring segment (17, 18), wherein a connecting device (19) has a first connecting element and a second connecting element (19a, 19b), wherein the first connecting element (19a) is disposed on the first ring segment (17), the second connecting element (19b) is disposed on the second ring segment (18), and wherein the first connecting element (19a) is configured to be a protruding protrusion, the second connecting element (19b) is in the form of a recess corresponding to the protrusion, and wherein the height to width ratio of the protrusion is 1:1, and the height to base width ratio is 2:

1.

2. The stator (13) as described in claim 1, characterized in that, The ratio of the width of the ring section (RB) to the width (B) of the first connecting element (19a) is 3:

1.

3. The stator (13) as described in claim 1 or 2, characterized in that, The first connecting element (19a) is positioned at the free end of the first ring section (17), and the second connecting element (19b) is positioned substantially at the first end of the second rod element (18).

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