Brushless motor for power tool

Abstract

A power tool described herein may include a housing, a motor, and a plurality of terminals. A slot may be formed between at least two terminal posts protruding from a surface of each terminal. The motor wire may be configured to perform a securing process (e.g., a first electrode, a second electrode, a third electrode, and a fourth electrode) by pressing a tip of the first electrode into contact with an outer portion of at least one of the at least two terminal posts and by controlling a current flow through the first electrode to a second electrode that is also in contact with the respective terminal. ) to a corresponding terminal of the motor wire within the slot. The tip of the first electrode may be configured to prevent the at least one terminal post from moving outwardly away from the center of the corresponding terminal during the fixation.

Description

[0001] Related Applications

[0002] This application claims priority to U.S. Provisional Patent Application No. 63 / 290,887 filed on December 17, 2021, the entire contents of which are hereby incorporated by reference. Technical Field

[0003] The present disclosure relates to a brushless motor for a power tool. Background Art

[0004] Power tools typically include a motor that is connected to a power source to power the tool. One such motor is a brushed direct current ("DC") motor. In a brushed DC motor, motor brushes make and break electrical connection to the motor as a result of the rotation of the rotor. Conventionally, brushed DC motors are used in power tools because of their relative ease of manufacture and low cost. Utility Model Content

[0005] Brushed DC motors have several disadvantages when used in power tools. One disadvantage of brushed DC motors is that the brushes eventually wear out, shortening the life of the power tool. In addition, because the brushes make and break electrical connections, sparks and electrical noise may be generated within the power tool. Brushless DC motors are another type of motor used in power tools. Brushless DC motors use electronically controlled switches instead of brushes to selectively power the motor's coils to drive the rotor.

[0006] Embodiments of the present disclosure include a power tool that may include a housing and a brushless direct current (DC) motor that is located within the housing and has a rotor and a stator. The rotor may be coupled to a motor shaft that is arranged to generate an output outside the housing. The power tool may further include a plurality of terminals that are mounted on the outer circumference of the stator. Each of the plurality of terminals may include at least two terminal posts that protrude from the surface of the terminal away from the motor axis, and the rotor is configured to rotate around the motor axis. A slot may be formed between at least two terminal posts. The slot may be configured to receive a motor lead. The motor lead received in each slot of each terminal is configured to be fixed to its corresponding terminal. In order to fix the motor lead to its corresponding terminal, the end of the first electrode is pressed to contact the outer portion of at least one of the at least two terminal posts, and the current is controlled to flow through the first electrode to the second electrode that is also in contact with the corresponding terminal. The current generates heat to combine the corresponding motor lead with the corresponding terminal. The end of the first electrode is configured to prevent at least one terminal post from moving outward away from the center of the corresponding terminal when fixed.

[0007] In some aspects, to press the tip of the first electrode into contact with an outer portion of at least one terminal post, the tip of the first electrode is pressed into contact with respective outer portions of two of the at least two terminal posts.

[0008] In some aspects, the tip of the first electrode includes a U-shaped shank configured to contact an outer portion of each of two outer terminal posts of the at least two terminal posts.

[0009] In some aspects, the U-shaped handle is one of cylindrical and rectangular.

[0010] In some aspects, in order to fix the motor lead to its corresponding terminal, the end of the second electrode is pressed into contact with the outer portion of the second terminal post of the at least two terminal posts. The second terminal post is located on a side of the surface of the corresponding terminal opposite to the at least one terminal post. The end of the second electrode is configured to prevent the second terminal post from moving outwardly away from the center of the corresponding terminal when fixed.

[0011] In some aspects, the tip of the first electrode includes a V-shaped cutout configured to contact an outer edge of at least one terminal post. The tip of the second electrode includes a V-shaped cutout configured to contact an outer edge of a second terminal post.

[0012] In some aspects, the first electrode comprises a positive electrode and the second electrode comprises a negative electrode.

[0013] In some aspects, the motor leads are connected to their respective terminals by one of welding, fusing, or a combination of welding and fusing.

[0014] Embodiments of the present disclosure also include a method for assembling a motor. The method may include: for each corresponding terminal of a plurality of terminals, inserting a portion of the motor wire into a slot on the corresponding terminal. The slot may be formed by at least two terminal posts protruding from the surface of the corresponding terminal. The method may further include: for each corresponding terminal of the plurality of terminals, pressing the end of a first electrode into contact with an outer portion of at least one of the at least two terminal posts, and performing a fixing process by controlling a current to flow through the first electrode to a second electrode that is also in contact with the corresponding terminal. The current may generate heat to combine the wire with the terminal. The end of the first electrode may be configured to prevent at least one terminal post from moving outwardly away from the center of the terminal during the fixing process. The method may further include mounting a plurality of terminals adjacent to each other on the outer circumference of the motor, oriented so that at least two terminal posts protrude away from the motor axis, and the rotor of the motor is configured to rotate around the motor axis. The method may further include mounting the motor in a housing of a power tool.

[0015] In some aspects, the method further includes pressing the tip of the first electrode into contact with an outer portion of at least one terminal post includes pressing the tip of the first electrode into contact with respective outer portions of two of the at least two terminal posts.

[0016] In some aspects, the tip of the first electrode includes a U-shaped shank configured to contact an outer portion of each of two outer terminal posts of the at least two terminal posts.

[0017] In some aspects, the U-shaped handle is one of cylindrical and rectangular.

[0018] In some aspects, the method further includes pressing a tip of the second electrode into contact with an outer portion of a second terminal post of the at least two terminal posts. The second terminal post is located on a side of the terminal surface that is laterally opposite to the at least one terminal post. The tip of the second electrode is configured to prevent the second terminal post from moving outwardly away from the center of the terminal during the fixing process.

[0019] In some aspects, the tip of the first electrode includes a V-shaped cutout configured to contact an outer edge of at least one terminal post. The tip of the second electrode includes a V-shaped cutout configured to contact an outer edge of a second terminal post.

[0020] In some aspects, the first electrode comprises a positive electrode and the second electrode comprises a negative electrode.

[0021] In some aspects, performing the fixing process includes welding, fusing, or a combination of welding and fusing.

[0022] Embodiments of the present disclosure also include a method for fixing a wire to a terminal. The method may include inserting a portion of the wire into a slot on the terminal. The slot may be formed by at least two terminal posts protruding from the surface of the terminal. The method may further include pressing the end of a first electrode into contact with an outer portion of at least one of the at least two terminal posts. The method may further include performing a fixing process by controlling a current to flow through the first electrode to a second electrode that is also in contact with the corresponding terminal. The current may generate heat to bond the wire to the terminal. The end of the first electrode may be configured to prevent at least one terminal post from moving outward away from the center of the terminal during the fixing process.

[0023] In some aspects, the tip of the first electrode includes a U-shaped shank configured to contact an outer portion of each of two outer terminal posts of the at least two terminal posts.

[0024] In some aspects, the method further includes pressing a tip of the second electrode into contact with an outer portion of a second terminal post of the at least two terminal posts. The second terminal post is located on a side of the terminal surface that is laterally opposite to the at least one terminal post. The tip of the second electrode is configured to prevent the second terminal post from moving outwardly away from the center of the terminal during the fixing process.

[0025] In some aspects, the tip of the first electrode includes a V-shaped cutout configured to contact an outer edge of at least one terminal post. The tip of the second electrode includes a V-shaped cutout configured to contact an outer edge of a second terminal post.

[0026] Before any embodiment is explained in detail, it should be understood that the embodiments are not limited in their application to the details of construction and arrangement of components set forth in the following description or shown in the accompanying drawings. The embodiments can be practiced or executed in various ways. In addition, it should be understood that the words and terms used herein are for illustrative purposes and should not be considered restrictive. The use of "including", "comprising" or "having" and variations thereof is meant to cover the items listed thereafter and their equivalents, as well as additional items. Unless otherwise specified or limited, the terms "mounted", "connected", "supported" and "coupled" and variations thereof are used broadly and cover both direct mounting, connection, support and coupling as well as indirect mounting, connection, support and coupling.

[0027] In addition, it should be understood that embodiments may include hardware, software, and electronic components or modules, which, for the purpose of discussion, may be shown and described as if most components are implemented only in hardware. However, those of ordinary skill in the art will recognize based on reading this detailed description that, in at least one embodiment, electronic-based aspects may be implemented in software (e.g., stored on a non-transient computer-readable medium) that may be executed by one or more processing units (e.g., microprocessors and / or application-specific integrated circuits ("ASICs")). Thus, it should be noted that embodiments may be implemented using a plurality of hardware- and software-based devices and a plurality of different structural components. For example, the "server," "computing device," "controller," "processor," etc. described in the specification may include one or more processing units, one or more computer-readable medium modules, one or more input / output interfaces, and various connectors (e.g., system buses) connecting these components.

[0028] Relative terms used in conjunction with quantities or conditions, such as "about", "approximately", "substantially", etc., will be understood by those of ordinary skill in the art to include the stated value and have the meaning dictated by the context (e.g., the term includes at least the degree of error associated with measurement accuracy, the tolerance associated with a particular value [e.g., manufacturing, assembly, use, etc.], etc.). Such terms should also be considered to disclose a range defined by the absolute values ​​of the two endpoints. For example, the expression "from about 2 to about 4" also discloses a range "from 2 to 4". Relative terms can refer to positive and negative percentages (e.g., 1%, 5%, 10%, or more) of the indicated value.

[0029] It should be understood that although some drawings show the hardware and software in a particular device, these depictions are for illustrative purposes only. The function described herein as being performed by a component can be performed in a distributed manner by multiple components. Likewise, the function performed by multiple components can be merged and performed by a single component. In some embodiments, the components shown can be combined or divided into separate software, firmware and / or hardware. For example, logic and processing can be distributed between multiple electronic processors, rather than being located in a single electronic processor and performed by it. Regardless of how hardware components and software components are combined or divided, these hardware components and software components can be located on the same computing device or can be distributed between different computing devices connected by one or more networks or other suitable communication links. Similarly, the components described as performing a specific function can also perform additional functions not described herein. For example, a device or structure that is "configured" in a certain way is configured at least in this way, but can also be configured in a way that is not explicitly listed.

[0030] Other aspects of the embodiments will become apparent by consideration of the detailed description and accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A power tool incorporating a brushless DC motor was demonstrated.

[0032] Figure 2 Shows, for example Figure 1 A block diagram of the brushless power tool shown.

[0033] Figure 3A and Figure 3B A stator for an electric machine according to embodiments described herein is shown.

[0034] Figure 4A , Figure 4B and Figure 4C A motor terminal according to embodiments described herein is shown.

[0035] Figure 5 A method for fixing a motor lead to a motor according to an embodiment described herein is shown. Figure 4A , Figure 4B and Figure 4C The motor terminals are the electrodes of the machine.

[0036] Fig. 6A and Figure 6B According to the embodiments described herein, a method for Figure 5 The fused end of one or both of the electrodes shown in FIG. 1 is used to secure the motor wire to the Figure 4A , Figure 4B and Figure 4C motor terminals.

[0037] Fig. 7A and Figure 7B According to the embodiments described herein, Fig. 6A and Figure 6B Fused terminal contact Figure 4A , Figure 4B and Figure 4C motor terminals.

[0038] Fig. 8A and Figure 8B According to the embodiments described herein, a method for Figure 5 Another fused end of one or both of the electrodes shown in the figure is used to fix the motor wire to Figure 4A , Figure 4B and Figure 4C motor terminals.

[0039] Fig.9A and Fig. 9B According to the embodiments described herein, Fig. 8A and Figure 8B Fused terminal contact Figure 4A , Figure 4B and Figure 4C motor terminals. DETAILED DESCRIPTION

[0040] Figure 1 A power tool 100 including a brushless direct current (DC) motor is shown. In a brushless motor power tool such as power tool 100, a switching element is selectively enabled and disabled by a control signal from a controller to selectively apply power from a power source (e.g., a battery pack) to drive the brushless motor. The power tool 100 is shown as a brushless hammer drill having a housing 102 having a handle portion 104 and a motor housing portion 106. The power tool 100 further includes an output unit 107, a torque setting dial 108, a forward / reverse selector 110, a trigger 112, a battery pack interface 114, and a light 116. Although Figure 1A hammer drill is shown, but in some embodiments, the motors described herein are incorporated into other types of power tools, including drill / drivers, impact drivers, impact wrenches, circular saws, reciprocating saws, string trimmers, leaf blowers, vacuum cleaners, and the like.

[0041] Figure 2 A simplified block diagram 120 of a brushless power tool 100 is shown, which includes a power supply 122, a field effect transistor (FET) 124, a motor 126, a Hall effect sensor 128, a motor controller 130, a user input 132 and other components 133 (battery pack fuel gauge, work light (LED), current / voltage sensor, etc.). The power supply 122 provides DC power to various components of the power tool 100, and can be a rechargeable power tool battery pack using, for example, lithium-ion battery technology. In some cases, the power supply 122 can receive AC power (e.g., 120V / 60Hz) from a tool plug connected to a standard wall outlet, and then filter, regulate and rectify the received power to output DC power. Each Hall effect sensor 128 outputs motor feedback information, such as outputting an indication (e.g., pulse) when the magnet of the rotor rotates across the surface of this Hall sensor. Based on the motor feedback information from the Hall sensor 128, the motor controller 130 can determine the position, speed and acceleration of the rotor. The motor controller 130 also receives user control from a user input 132, such as by pressing the trigger 112 or switching the forward / reverse selector 110. In response to the motor feedback information and the user control, the motor controller 130 transmits a control signal to control the FET 124 to drive the motor 126. By selectively enabling and disabling the FET 124, power from the power supply 122 is selectively applied to the stator coils of the motor 126 to cause rotation of the rotor. Although not shown, the motor controller 130 and other components of the power tool 100 are electrically connected to the power supply 122 so that the power supply 122 provides power thereto.

[0042] refer to FIG. 3A to FIG. 3B Various embodiments of the motor 126 are shown and described herein. Any terminal design may be used with any motor or stator disclosed herein. For example, terminals disclosed as being located on a single terminal mounting member may alternatively be individually positioned around the outer circumference of the stator (e.g., spaced approximately 120° apart), and terminals disclosed as being positioned around the outer circumference of the stator (e.g., spaced approximately 120° apart) may alternatively be located on a single terminal mounting member.

[0043] FIG. 3A to FIG. 3BAn electric motor 300 is shown that includes a terminal assembly 305 having a plurality of terminals 310. The terminals can be mounted on a terminal mount that can be made of resin, rubber, or another non-conductive material. In some embodiments, stator coils (i.e., stator windings, wire leads, stator winding leads) 317A to 317C are brazed, resistance welded, or fused to one end of the terminal 310. For example, one end of the stator coil 317 is brazed, resistance welded, or fused to a compression tang ring 320 on a first end of the terminal 310. In some embodiments, the wire that connects the terminal 310 to the power source 122 via the FET 124 is brazed or otherwise connected to a second end of the terminal 310 that is opposite to the first end of the terminal 310, where the tang ring 320 is located on the first end.

[0044] The stator coil 317 is energized to generate a magnetic field. The stator coil 317 is electrically connected to the corresponding phase line via the terminal 310. In other words, the phase line is electrically connected to the stator coil 317. For example, the stator coil 317 is selectively energized by the power supply 122 via the FET 124. In the illustrated embodiment, the stator coil 317 includes three phases. The three phases of the stator coil 317 can be connected to each other in a triangle, a wye, or any other suitable configuration.

[0045] like FIG. 3A to FIG. 3B As shown, in some embodiments, the motor 300 includes a lamination stack 325, a stator molding 330, and the stator molding is molded or fixed to the lamination stack 325 to form a molded stator body 335 ( Figure 3A ). The stator molding 330 of the molded stator body 335 includes a first axial end portion 340, a second axial end portion 345, and an extension portion 350 extending axially along the outer circumferential surface / peripheral surface of the lamination stack 325. The extension portion 350 is bent along the outer circumferential surface of the lamination stack 325. In the illustrated embodiment, the extension portion 350 extends from the first axial end portion 340 at least partially between the first axial end portion 340 and the second axial end portion 345. The stator molding 330 includes a post 355 formed to extend away from the first axial end portion 340. The posts 355 are wire routing features that assist in the process of winding the stator coil 317 onto the molded stator body 335.

[0046] Figure 4A , Figure 4B and Figure 4C Terminal 400 is shown, which can be attached to motor 300 (e.g., in place of FIG. 3A to FIG. 3BTerminal 310 shown). Terminal 400 includes a plurality of terminal posts 405 arranged parallel to each other at a first end of terminal 400. Slot 407 may be located between terminal posts 405 and configured to receive a wire (e.g., a motor winding). The wire (e.g., a multi-turn motor winding) may be pressed into slot 407 and then fixed to terminal 400 by using a fixing method including, for example, brazing, welding, and / or fusing. In some cases, the fixing method may be performed by a fixing machine (e.g., a brazing gun, a welding machine / welding tool, a fusing machine / fusing tool, etc.). Terminal 400 also includes a terminal orifice 410 at a second end of terminal 400. In some embodiments, terminal post 405 is configured to be connected to a positive power line for motor 300, and terminal orifice 410 is configured to be connected to a negative power line for motor 300. In other embodiments, terminal post 405 is configured to be connected to a negative power line for motor 300, and terminal orifice 410 is configured to be connected to a positive power line for motor 300. The terminal 400 also includes a terminal mounting post 415 for fixing the terminal 400 to the motor 300. For example, the extension portion 350 may include a non-conductive mounting member. The non-conductive mounting member may include a plurality of grooves, each of which is configured to receive the terminal mounting post 415 of the corresponding terminal 400.

[0047] As indicated above, a fixing method such as welding (eg, fusion welding) may be used to fix the motor wires 520 into the slots 407 of each terminal 400 (see FIG. Figure 5 ). For example, fusion welding may involve positive electrode 505 and negative electrode 515 (see Figure 5 ), current is applied to the terminal 400 and the motor wire 520 through the positive electrode and the negative electrode until the motor wire becomes hot enough to melt and bond with the terminal 400. In some cases, an intermediate filler metal can be used to join the terminal 400 and the motor wire 520 during the welding process to establish an electrical and physical connection therebetween.

[0048] The electrode fusion tip 510 (i.e., the end of the electrode contacting the terminal 400 and / or the motor lead 520) of one of the electrodes 505, 515 used for welding (e.g., the positive electrode 505) is typically substantially flat. Figure 5An electrode 505 is shown having a cylindrical tip 510 that is substantially flat. Additionally, during the welding process, one or both of the fused tips 510 of the electrodes 505, 515 typically apply pressure to the terminal 400. Accordingly, during the welding process, a portion of the terminal 400 may typically be deformed. For example, one or both of the outer terminal posts 405 may be pushed outwardly away from the center terminal post 405. Such deformation is undesirable, particularly when the terminals 400 are positioned in close proximity to one another (as is the case in many power tools where space is limited and a compact design is desired), such as the terminal 310 shown. FIG. 3A to FIG. 3B For example, the outer terminal column 405 deformed outward may increase the chance of short circuit between adjacent terminals 400, 310. Therefore, there are technical problems in the welding process of the terminal of the motor.

[0049] The present disclosure solves this technical problem by providing one or more electrode fusion tips and / or a fixing method that provides mechanical stability to the outer terminal post 405 during the fixing process (eg, welding) of the motor wire 520 to the terminal 400 .

[0050] Fig. 6A and Figure 6B A fusion tip 600 (ie, an electrode fusion tip 600) is shown that can be located at an electrode (eg, Figure 5 The fusion tip 600 can be used to electrically and mechanically connect / fix the motor wire 520 to the terminal 400 during a fixing process (e.g., welding). The fusion tip 600 includes a handle 605 and a wire portion 610. The handle 605 is configured to contact the terminal 400 and / or the motor wire 520 plugged between the terminal posts 405 of the terminal 400. The wire portion 610 is configured to be coupled to / connected to or integrated into the positive electrode 505. In the illustrated embodiment, the handle 605 has an external rectangular shape. Internally, the handle 605 includes a first side surface 615, a second side surface 620, and a third side surface 625. In some embodiments, the first side surface 615 and the second side surface 620 form an obtuse angle relative to the third side surface 625. In other embodiments, the handle 605 has a cylindrical shape rather than a rectangular shape. In some cases, Fig. 6A and Figure 6B The handle 605 shown and the cylindrical handle can be referred to as a U-shaped handle. In some cases, a single U-shaped handle is configured to simultaneously contact the Fig. 7A and Figure 7B The outside / exterior portion of each outer terminal post 405 is shown. In some cases, such as where negative electrode 515 contacts the portion of terminal 400 that includes terminal post 405 and motor lead 520, handle 605 can be located on negative electrode 515.

[0051] Fig. 7A and Figure 7B Arrangement 700 is shown in which fusion tip 600 contacts terminal 400 at a location that occurs during the securing process (e.g., welding) of motor wire 520 to terminal 400. Fig. 7A and Figure 7B 700, but in the arrangement 700, the second electrode 515 can be pressed against the central portion of the terminal 400 between the aperture 410 and the upper portion of the terminal 400, wherein the terminal post 405 is in contact with the Figure 5 The first side surface 615 and the second side surface 620 of the fusion tip 600 mechanically engage the terminal post 405 to help secure the fusion tip 600 in place and to help prevent the outer terminal post 405 from moving outward (e.g., away from the center of the terminal 400 where the center terminal post 405 is located) during the securing process (e.g., welding, fusing, etc.) of securing the motor wire 520 to the terminal 400.

[0052] Fig. 8A and Figure 8B Another fused tip 800 is shown that can be located at one or more electrodes (e.g., Figure 5 The fusion tip 800 can be used to electrically and mechanically connect / fix the motor wire 520 to the terminal 400 during a fixing process (e.g., welding). Similar to the fusion tip 600 of FIG. 6 , the fusion tip 800 includes a handle 805 and a wire portion 810. However, the handle 805 of the fusion tip 800 includes a V-shaped cutout formed by side surfaces 815. The V-shaped cutout can be formed by side surfaces 815 oriented at an angle of approximately ninety degrees relative to each other. In some cases, the angle of the cutout can be less than or greater than ninety degrees.

[0053] Fig.9A and Fig. 9B An arrangement 900 is shown in which two fusion tips 800 contact the terminal 400 at an oblique angle (e.g., contact the respective outer edges of the respective outer terminal posts 405). For example, when the cut angle of the shank 805 is about ninety degrees, the angle between the axes passing through each fusion tip 800 is also about ninety degrees, as shown in FIG. Fig. 9BAs shown. The first fusion tip 800 connected to the negative electrode 515 can be pressed into contact with the first terminal post 405 (e.g., the first outer terminal post 405) of the terminal 400. The second fusion tip 800 connected to the positive electrode 505 can be pressed into contact with the second terminal post 405 of the terminal 400 (e.g., the second outer terminal post 405 on the lateral side of the terminal 400 opposite to the first outer terminal post 405). The two fusion tips 800 mechanically engage the corresponding terminal posts 405 at the side surface 715 of the handle 705. The force from each fusion tip 800 toward the terminal 400 helps to fix the fusion tips 800 in place and also prevents the sides of the terminal 400 (e.g., the outer terminal posts 405) from being pushed outward (e.g., away from the center of the terminal 400 where the center terminal post 405 is located) during the fixing process (e.g., welding, fusing, etc.). In some cases, the polarity of the fusion tip 800 can be different from that of the terminal 400. Fig. 9B The polarity shown is reversed (eg, the left fused tip 800 may be connected to a positive electrode and the right fused tip 800 may be connected to a negative electrode).

[0054] Thus, some embodiments provide, among other things, a brushless motor including a fused motor terminal and one or more methods for assembling a motor terminal forming part of a brushless motor.

Claims

1. A power tool comprising: case; a brushless direct current (DC) motor located within the housing and having a rotor and a stator, wherein the rotor is coupled to a motor shaft arranged to generate an output external to the housing; and a plurality of terminals mounted on an outer circumference of the stator, wherein each of the plurality of terminals includes at least two terminal posts protruding from a surface of the terminal away from a motor axis, the rotor being configured to rotate about the motor axis, wherein a slot is formed between the at least two terminal posts, and wherein the slot is configured to receive a motor wire; wherein the motor wire received in each slot of each terminal is configured to be fixed to a corresponding terminal of the motor wire, and Wherein, in order to fix the motor lead to the corresponding terminal of the motor lead: The tip of the first electrode is pressed to contact an outer portion of at least one of the at least two terminal posts, and Current is controlled to flow through the first electrode to a second electrode also in contact with the corresponding terminal, wherein the current generates heat to bond the corresponding motor wire to the corresponding terminal, The tip of the first electrode is configured to prevent the at least one terminal column from moving outward away from the center of the corresponding terminal when fixed.

2. The power tool according to claim 1, wherein: In order to press the tip of the first electrode into contact with the outer portion of the at least one terminal column, the tip of the first electrode is pressed into contact with the respective outer portions of two of the at least two terminal columns.

3. The power tool according to claim 1, wherein: The tip of the first electrode includes a U-shaped shank configured to contact an outer portion of each of two outer terminal posts of the at least two terminal posts.

4. The power tool according to claim 3, wherein: The U-shaped handle is one of cylindrical and rectangular.

5. The power tool according to claim 1, wherein: To secure the motor leads to the corresponding terminals on the motor leads: The tip of the second electrode is pressed into contact with an outer portion of a second terminal post of the at least two terminal posts, wherein the second terminal post is located on a side of the corresponding terminal surface that is laterally opposite to the at least one terminal post; The end of the second electrode is configured to prevent the second terminal column from moving outward away from the center of the corresponding terminal when fixed.

6. The power tool according to claim 5, wherein: The tip of the first electrode includes a V-shaped cutout configured to contact an outer edge of the at least one terminal post; and The end of the second electrode includes a V-shaped cutout, and the V-shaped cutout is configured to contact the outer edge of the second terminal column.

7. The power tool according to claim 1, wherein: The first electrode includes a positive electrode, and the second electrode includes a negative electrode.

8. The power tool according to claim 1, wherein: The motor wires are connected to their corresponding terminals by one of welding, fusing, or a combination of welding and fusing.

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