Electric tool
阅读说明:本技术 电动工具 (Electric tool ) 是由 J·C·巴尔托谢克 S·C·埃利 D·F·莱维特 于 2015-07-01 设计创作,主要内容包括:本申请案涉及电动工具。在至少一个说明性实施例中,一种电动工具可包括电动机,所述电动机包括:转子,其经配置以围绕轴旋转;定子组合件,其包含围绕所述转子布置的至少三个绕组;及至少三个凸耳,其固定到所述定子组合件,其中所述凸耳中的每一者电耦合到所述绕组中的一或多者。所述凸耳可全部布置到穿过所述轴的平面的一侧。所述电动工具可进一步包括:至少三个电线,其中所述电线中的每一者可移除地耦合到所述凸耳中的一者;及控制电路,其经配置以经由所述电线及所述凸耳将电力供应到所述绕组,以驱动所述转子围绕所述轴的旋转。(The present application relates to power tools. In at least one illustrative embodiment, a power tool may include a motor comprising: a rotor configured to rotate about an axis; a stator assembly including at least three windings arranged around the rotor; and at least three lugs secured to the stator assembly, wherein each of the lugs is electrically coupled to one or more of the windings. The lugs may all be arranged to one side of a plane through the shaft. The power tool may further include: at least three wires, wherein each of the wires is removably coupled to one of the lugs; and a control circuit configured to supply power to the windings via the wires and the lugs to drive rotation of the rotor about the shaft.)
1. A power tool, comprising:
a motor comprising a rotor configured to rotate about an axis, a stator assembly arranged around the rotor, and at least one lug secured to the stator assembly, wherein the at least one lug is electrically coupled to a winding on the stator;
at least one wire removably coupled to the at least one lug;
wherein the at least one lug comprises an inner peripheral wall defining an opening extending into the lug; and
at least one ferrule;
wherein the at least one wire extends into the at least one ferrule;
wherein the at least one ferrule removably extends into the opening of the lug and engages the inner peripheral wall of the opening to removably couple the at least one wire to the at least one lug; and is
Configured such that the at least one ferrule is removable from the opening of the lug when the at least one wire remains extended into the at least one ferrule and when the lug remains secured to the stator assembly.
2. The power tool of claim 1, wherein the at least one ferrule is welded to the at least one lug.
3. The power tool of claim 1, wherein the at least one ferrule is removably welded to the at least one lug.
4. The power tool of claim 3, wherein the at least one ferrule is selectively welded, de-welded, and re-welded to the at least one lug.
5. The power tool of claim 1, wherein the at least one lug includes a protrusion extending radially outward from the stator assembly and the opening defines a circular opening.
6. The power tool of claim 5, wherein the at least one wire is surrounded by the protrusion when the at least one wire is received by the circular opening.
7. The power tool of claim 5, wherein the protrusion includes an annular wall defining the circular opening.
8. The power tool of claim 5, wherein an outer perimeter of each protrusion defines a generally rectangular or circular shape.
9. The power tool of claim 1, wherein the at least one lug includes a female socket and the at least one wire includes a male plug configured to be received by the female socket.
10. The power tool of claim 1, wherein the at least one lug is at least two lugs.
11. A power tool, comprising:
a motor comprising a rotor configured to rotate about an axis, a stator assembly arranged around the rotor, and at least two lobes fixed to the stator assembly, wherein the at least two lobes are electrically coupled to windings on the stator;
at least two electrical wires, each removably coupled to one of the at least two lugs;
wherein each of the at least two lugs includes an inner peripheral wall defining an opening extending into each of the at least two lugs; and
at least two ferrules;
wherein each of the at least two wires extends into one of the at least two ferrules, respectively;
wherein each of the at least two ferrules removably extends into the opening of one of the lugs and engages the inner peripheral wall of the opening to removably couple each of the at least two wires to each of the at least two lugs;
is configured such that each of the at least two ferrules is removable from the opening into which the lug extends when each of the at least two wires remains extending into one of the at least two ferrules, respectively, and when each of the at least two lugs remains secured to the stator assembly.
12. The power tool of claim 11, wherein each of the at least two collars is welded to each of the at least two lugs.
13. The power tool of claim 11, wherein each of the at least two collars is removably welded to each of the at least two lugs.
14. The power tool of claim 13, wherein each of the at least two collars is selectively welded, de-welded, and re-welded to each of the at least two lugs.
15. The power tool of claim 11, wherein each of the at least two lugs includes a protrusion extending radially outward from the stator assembly and each of the openings defines a circular opening.
16. The power tool of claim 15, wherein each of the at least two wires is surrounded by the protrusion when each of the at least two wires is received by one of the circular openings.
17. A power tool, comprising:
a motor comprising a rotor configured to rotate about an axis, a stator assembly arranged around the rotor, and at least one lug secured to the stator assembly, wherein the at least one lug is electrically coupled to a winding on the stator; and
at least one wire removably coupled to the at least one lug;
wherein the at least one lug comprises an inner peripheral wall defining an opening extending into the lug;
wherein the at least one electrical wire removably extends into the opening of the lug and conductively engages the inner peripheral wall of the opening to removably couple the at least one electrical wire to the at least one lug; and is
Configured such that the at least one ferrule is removable from the opening of the lug when the at least one wire remains extended into the at least one ferrule and when the lug remains secured to the stator assembly.
18. The power tool of claim 17, wherein the at least one lug includes a protrusion extending radially outward from the stator assembly and the opening defines a circular opening.
19. The power tool of claim 18, wherein the at least one wire is surrounded by the protrusion when the at least one wire is received by the circular opening.
20. The power tool of claim 17, wherein the at least one wire is soldered to the at least one lug.
Technical Field
The present invention relates generally to power tools, and more particularly to motor connections for power tools.
Background
Motors used in power tools (by way of example, brushless direct current ("DC") motors) typically require connections to three large format "phase" wires that supply the high current that drives the motor. In many existing power tools, this connection is typically accomplished by soldering the phase wires to a printed circuit board ("PCB") inside the motor. Traces on the PCB, to which the stator windings of the motor are coupled, then conduct the high current from the phase lines to the soldered termination points. Serving the electric motor with such designs can be difficult, as desoldering the phase line from the PCB can be time consuming and risk damaging the PCB.
Other power tool designs have provided connections between the phase wires and the stator windings of the motor by solder "lugs" mounted to one end of the motor. While such designs may improve serviceability, they have also increased the footprint of the motor (and thus the size of the power tool). First, the solder lugs in such designs add length to the motor assembly. Second, because the solder lugs in such designs have typically been evenly spaced around the circumference of the motor, one or more of the phase lines typically must be wound around the motor for connection to the corresponding solder lug.
Disclosure of Invention
According to one aspect, a power tool may include a motor including (i) a rotor configured to rotate about an axis, (ii) a stator assembly including at least three windings arranged about the rotor, and (iii) at least three lugs secured to the stator assembly, wherein each of the lugs is electrically coupled to one or more of the windings. The lugs may all be arranged to one side of a plane through the shaft. The power tool may further include: at least three wires, wherein each of the wires is removably coupled to one of the lugs; and a control circuit configured to supply power to the windings via the wires and the lugs to drive rotation of the rotor about the shaft.
In some embodiments, each of the wires may be welded to one of the lugs. Each of the lugs may define a circular opening, and each of the wires may be received by one of the circular openings to removably couple each of the wires to one of the lugs. Each of the lugs may include a protrusion extending radially outward from the stator assembly and defining the circular opening. Each of the wires may be surrounded by one of the protrusions when each of the wires is received by one of the circular openings. Each protrusion may include an annular wall defining the circular opening. The outer perimeter of each protrusion may define a generally rectangular or circular shape.
In other embodiments, each of the lugs may include a fastener, and each of the wires may be coupled to one of the lugs by the corresponding fastener. In still other embodiments, each of the lugs may comprise a female receptacle and each of the wires may comprise a male plug configured to be received in one of the female receptacles. The stator assembly may further include a lamination stack supporting the windings. Each of the lugs may be secured to an exterior surface of the lamination stack.
According to another aspect, a power tool may include a motor including (i) a rotor configured to rotate about an axis, (ii) a stator assembly including at least three windings arranged about the rotor, and (iii) at least three lugs secured to the stator assembly, wherein each of the at least three lugs is electrically coupled to one or more of the windings. The at least three lugs may all be arranged to one side of a plane through the shaft. The power tool may further include at least three wires, wherein each of the wires is surrounded by one of the at least three lugs to removably couple each of the wires to one of the at least three lugs.
In some embodiments, each of the wires may be welded to one of the at least three lugs. In other embodiments, each of the at least three lugs may include a fastener, and each of the wires may be coupled to one of the at least three lugs by the corresponding fastener. In still other embodiments, each of the at least three lugs may comprise a female receptacle and each of the wires may comprise a male plug configured to be received in one of the female receptacles.
According to another aspect, an electric motor may include: a rotor configured to rotate about an axis; a stator assembly including at least three windings arranged around the rotor; and at least three lugs secured to the stator assembly, each of the at least three lugs being electrically coupled to one or more of the windings. Each of the at least three lugs may include a protrusion extending radially outward from the stator assembly. The protrusion may define a circular opening configured to receive an electrical wire. The projections of the at least three lugs may all be arranged to one side of a plane through the shaft.
In some embodiments, each protrusion may include an annular wall defining the circular aperture. Each projection may further include a pair of planar faces arranged opposite each other and interconnected by the annular wall. An outer perimeter of each of the pair of planar faces may define a generally rectangular shape. In other embodiments, the outer perimeter of each of the pair of planar faces may define a generally circular shape. The stator assembly may further include a lamination stack supporting the windings. Each of the at least three lugs may be secured to an exterior surface of the lamination stack.
Drawings
The concepts described in this disclosure are illustrated by way of example and not by way of limitation in the figures of the accompanying drawings. For simplicity and clarity of illustration, elements illustrated in the figures are not necessarily drawn to scale. For example, the dimensions of some of the elements may be exaggerated relative to other elements for clarity.
FIG. 1 is a side elevational view of an illustrative power tool;
FIG. 2 is an end elevational view of the power tool of FIG. 1;
FIG. 3 is an enlarged cross-sectional view of a motor included in the power tool (taken about line 3-3 of FIG. 1) with the remainder of the power tool omitted for clarity;
FIG. 4 is a partial perspective view of various components associated with the motor of the power tool of FIG. 1 with the remainder of the power tool omitted for clarity; and is
Fig. 5 is an enlarged partial perspective view of various components associated with the motor of the power tool of fig. 1 with the remainder of the power tool omitted for clarity.
Detailed Description
While the concepts of the present disclosure are susceptible to various modifications and alternative forms, specific exemplary embodiments thereof have been shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that there is no intention to limit the inventive concepts to the specific forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.
Referring now to fig. 1, an
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As shown in fig. 5, the
During operation of the
In the illustrative embodiment of fig. 5, the
The solder lugs 60 may be formed of a metal, metal alloy, or any other material suitable for conducting electrical current between the
As best seen in fig. 5, each of the solder lugs 60 includes a
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As best seen in fig. 5, each of the
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In the illustrative embodiment (best seen in fig. 4), each of the solder lugs 60 is arranged below the centerline of the motor 20 (i.e., the shaft 42). In other words, the solder lugs 60 are all disposed to one side of a plane passing through the
It is contemplated that in other embodiments of the
While certain illustrative embodiments have been described in detail in the drawings and foregoing description, such illustration and description are to be considered as exemplary and not restrictive in character, it being understood that only illustrative embodiments have been shown and described and that all changes and modifications that come within the spirit of the invention are desired to be protected. For example, while the concepts of the present invention have been described primarily with reference to brushless DC motors, it is contemplated that the presently disclosed teachings may also be applicable to other types of motors, such as brushed DC motors and/or alternating current motors.
There are a number of advantages of the present invention that derive from the various features of the apparatus, systems, and methods described herein. It will be noted that alternative embodiments of the apparatus, systems, and methods of the present disclosure may not include all of the features described yet still benefit from at least some of the advantages of such features. Those skilled in the art may readily devise their own implementations of the apparatus, system, and method that incorporate one or more of the features of the present disclosure.
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