electric machine

Abstract

This application discloses an electric motor. The motor includes a brush holder disposed between a magnetic pole housing and a transmission member. A rotor passes through the brush holder and is connected to the transmission member. The brush holder has a mounting groove with a wall defining an internal space. An opening is located at the top of the mounting groove, through which a thermal protector is mounted into the internal space. An elastic arm is provided in the wall, and the elastic arm is elastically deformed to abut against the side of the thermal protector. Due to the elasticity of the elastic arm, the mounting groove can accommodate thermal protectors of different thicknesses.

Description

Technical Field

[0001] This application relates to small electric motors, and more specifically to an electric motor for driving movable parts of a vehicle. Background Technology

[0002] Vehicles contain many movable components such as seats, steering wheels, sunroofs, windows, and steering columns. These components are driven by electric motors. An electric motor includes a stator-rotor assembly that serves as the drive source and a transmission mechanism that provides the output. The motor can be a brushed motor. A brushed motor includes a brush holder for the brushes. Besides housing the brushes, the brush holder also serves other functions, such as covering the pole housings, carrying electronic components, forming wiring terminals, and mounting the pole housings to the transmission housing. Existing brush holders face numerous challenges during development, including integration, compatibility, circuit protection, installation processes, and cost. Summary of the Invention

[0003] One aspect of this application relates to a motor with an improved brush holder.

[0004] The motor includes a brush holder disposed between the magnetic pole housing and the transmission component. The rotor passes through the brush holder and is connected to the transmission component. The brush holder is provided with a mounting groove. The mounting groove has a wall that defines an internal space. An opening is provided at the top of the mounting groove. A thermal protector is installed into the internal space through the opening. The wall is provided with an elastic arm. The elastic arm is elastically deformed and abuts against the side of the thermal protector.

[0005] In one embodiment of the motor, the elastic arm includes an elongated plate having a height in the height direction of the wall, the height of the plate being greater than 1 / 4 of the height of the wall.

[0006] In one embodiment of the motor, the brush holder is formed of plastic by injection molding.

[0007] In one embodiment of the motor, the mounting slot is configured such that the thermal protector is limited in the mounting slot by the bottom of the mounting slot, the elastic arm, and the connected pins of the thermal protector at the opening.

[0008] In one embodiment of the motor, the wall extends into an extension at the bottom of the mounting groove, the wall having a first base, the extension having a cavity smaller than the internal space and a second base lower than the first base, the second base being configured to support a first thermal protector, and the first base being configured to support a second thermal protector of a different size than the first thermal protector.

[0009] In one embodiment of the motor, the resilient arm is located on a sidewall of the mounting slot, the resilient arm including a support portion projecting from the end of the plate toward the interior space, the support portion having a surface abutted by the side of the thermal protector.

[0010] In one embodiment of the motor, a heat dissipation hole is provided on the other sidewall opposite to the sidewall.

[0011] In one embodiment of the motor, the second base is provided with additional heat dissipation holes.

[0012] In one embodiment of the motor, the mounting slot is integrated on the brush holder, the brush holder including a substrate having a first side for arranging brushes and a second side relative to the first side, with a circuit board disposed on the second side.

[0013] In one embodiment of the motor, the elastic arm of the mounting slot is shaped to protrude from the first side.

[0014] In one embodiment of the motor, the extension is shaped to protrude from the second side and has a first retaining wall extending toward the outside of the mounting groove, the first retaining wall being located between the bearing holes of the circuit board and the brush holder, wherein the rotor is supported by bearings mating with the bearing holes.

[0015] In one embodiment of the motor, the second barrier is formed to protrude from the first side to cover a process hole on the substrate that runs through the first side and the second side.

[0016] In one embodiment of the motor, a plurality of pins are provided on the second side to position the circuit board, wherein any one of the pins is configured to have a guide section for the circuit board to pass through, a positioning platform for stopping the circuit board from continuing to pass through, and a mating section between the guide section and the positioning platform, the mating section being tightly fitted with the positioning hole of the circuit board.

[0017] In one embodiment of the motor, the mating section is configured as a plurality of portions extending from the cylinder of the pin to fill between the locating hole and the pin, each portion having an arcuate outer surface following a corresponding contour of the locating hole.

[0018] In one embodiment of the motor, the circuit board is configured to have an irregular profile.

[0019] In one embodiment of the motor, the bearing hole has a portion of it cut off in the circumferential direction to match a portion of the outline of the circuit board, the other portion of the circuit board following the shape of the brush holder.

[0020] In one embodiment of the motor, the brush holder has a socket integrated on its radially outer side, and a plurality of pinned terminals are connected between the socket and a circuit board mounted on the brush holder by means thereof being pressed into a slot in the socket.

[0021] The elastic arms on the wall of the mounting groove provide lateral pressure to the thermal protector entering the groove. The side of the thermal protector abuts against the elastic arms, which also provide frictional resistance to prevent the thermal protector from detaching from the mounting groove. Due to the elasticity of the elastic arms, the mounting groove can accommodate thermal protectors of different thicknesses. The elastic arms deform less for thinner thermal protectors and more for thicker ones. Therefore, the mounting groove of this application can accommodate both conventional and novel thermal protectors, which differ in structure and thus in size. Furthermore, this application not only accommodates thermal protectors of various thicknesses but also provides mounting space and multi-directional restraints to secure the thermal protector within the mounting groove through structural design.

[0022] By designing a barrier on the brush holder, the motor involved in this application can prevent toner from the brushes from contaminating multiple components on the brush holder, especially circuits and various electronic components. The presence of the barrier can prevent toner from adhering to these components, thereby playing a protective role.

[0023] The pins on the brush holder involved in this application not only guide the circuit board during installation, but also prevent the installed circuit board or the circuit board in an inverted state from falling off.

[0024] This application also provides a circuit board with a special shape, resembling a "D" and occupying a small area, taking up less than half the space on the brush holder, on which the electronic components required for the brush holder are integrated. This application provides a highly integrated and aesthetically pleasing brush holder.

[0025] Regarding the input / output terminals, the designed terminal pins not only simplify the structure but also provide a new mounting method. Compared to the existing method of integrating terminals into the socket with the brush holder via injection molding, this application simplifies the manufacturing process by pressing the terminals into the socket.

[0026] This application provides a motor with a novel brush holder. This application can be implemented by modifying an existing brush holder. The novel brush holder, along with the aforementioned mounting groove, multiple retaining walls, and multiple pins, is integrally injection molded and has advantages such as compatibility with various electronic components, protection of the circuit board, optimized structure, and convenient assembly. Therefore, the motor involved in this application has excellent performance characteristics such as high adaptability, high integration, and low-cost manufacturing.

[0027] Other aspects and features of this application will become apparent from the following detailed description with reference to the accompanying drawings. However, it should be understood that the drawings are designed for illustrative purposes only and are not intended to limit the scope of this application, as reference should be made to the appended claims. It should also be understood that the drawings are intended only to conceptually illustrate the structures and processes described herein, and are not necessarily drawn to scale unless otherwise indicated. Attached Figure Description

[0028] This application will be more fully understood by referring to the following detailed description of specific embodiments in conjunction with the accompanying drawings, in which the same reference numerals throughout refer to the same elements in the views. Wherein:

[0029] Figure 1 This is a schematic diagram of one embodiment of the motor involved in this application;

[0030] Figure 2-3 These are schematic diagrams of the brush holder in the motor involved in this application, viewed from different angles. Figure 2 Presenting the first side of the brush holder, Figure 3 Presenting the second side of the brush holder;

[0031] Figure 4 This is a schematic diagram of the interior of the mounting slot in the motor involved in this application;

[0032] Figure 5 for Figure 4 A partial schematic diagram of the mounting slot as seen from the outside;

[0033] Figure 6 A diagram showing the first thermal protector installed in the mounting slot;

[0034] Figure 7 A diagram showing the installation of the second thermal protector into the mounting slot;

[0035] Figure 8 This is a schematic diagram of another embodiment of the brush holder in the motor involved in this application;

[0036] Figure 9 This is a schematic diagram of another embodiment of the brush holder in the motor involved in this application;

[0037] Figure 10This is a schematic diagram of one embodiment of a pin used for guiding a circuit board in an electric motor according to this application;

[0038] Figure 11 for Figure 10 A cross-sectional schematic diagram showing the engagement of the pin with the positioning hole on the circuit board;

[0039] Figure 12 This is a schematic diagram of another embodiment of the brush holder in the motor involved in this application;

[0040] Figure 13 This is a schematic diagram of one embodiment of the terminal block in the motor involved in this application;

[0041] Figure 14 This is a schematic diagram of another embodiment of the motor terminal involved in this application;

[0042] Figure 15 This is a schematic diagram showing the motor terminal being installed inside the socket after installation in the socket; and

[0043] Figure 16 for Figure 15 A diagram showing the terminals installed in the socket as seen from the outside. Detailed Implementation

[0044] To help those skilled in the art to accurately understand the subject matter claimed in this application, the specific embodiments of this application are described in detail below with reference to the accompanying drawings.

[0045] Figure 1 This is a schematic diagram of one embodiment of the motor according to this application. The motor includes a pole housing 12, a brush holder 14, and a drive housing 16. The brush holder 14 is at least partially located within an intermediate housing 13 between the pole housing 12 and the drive housing 16. The brush holder 14 is formed of plastic by injection molding. A rotor and a stator are arranged within the pole housing 12. The brush holder 14 is adjacent to the pole housing 12 and can cover the pole housing 12. A drive member (not shown) is arranged within the drive housing 16. Inside the motor, the rotor passes through the brush holder 14 and is connected to the drive member. In one embodiment, the motor is a small motor, such as a DC permanent magnet motor.

[0046] Figure 2-3 This is a schematic diagram of an embodiment of the brush holder in the motor involved in this application from different perspectives. The brush holder 14 includes a substrate 18, which has a first side 20 and a second side 22 opposite to each other. Figure 2 The layout on the first side is shown. A pair of brushes (not shown) are arranged diagonally on the first side 20 via a bracket 17. Figure 3The layout on the second side is shown. Circuit board 24 is arranged on the second side 22. The brush holder 14 also includes a centrally located bearing hole 26 for the rotor to pass through, which is also arranged on the second side 22. When the brush holder 14 is closed... Figure 1 Behind the magnetic pole housing, the first side 20 faces the inside of the magnetic pole housing.

[0047] like Figure 2 As shown, a mounting slot 28 for a thermal protector (not shown) is located near a pair of brushes. The thermal protector is mounted into the mounting slot 28 on the first side 20. The pins of the mounted thermal protector will protrude from the mounting slot. A thermal protector, also known as a thermostat or thermal switch, acts as a safety device to prevent overheating of specific components within a motor. A typical thermal protector consists of a housing and positive and negative pins on the housing. The housing is generally rectangular.

[0048] Figure 4 This is a schematic diagram of the internal structure of the mounting slot. The mounting slot 28 has a wall 36 defining an internal space 38. To accommodate a thermal protector, the mounting slot 28 is constructed with a rectangular internal space 38. An opening 40 is provided at the top of the mounting slot 28, through which the thermal protector is mounted into the internal space 38 of the mounting slot 28 in the illustrated mounting direction f. A resilient arm 50 is provided at the opening 40 in the wall 36. The resilient arm 50 is configured such that one side of the thermal protector mounted in the mounting slot 28 abuts against the resilient arm 50. In one embodiment, the resilient arm 50 is slightly inclined toward the internal space, such as... Figure 4 As shown, the thermal protector, which is easily inserted into the mounting slot 28, contacts the elastic arm 50. Upon contact, the elastic arm 50 deforms in the opposite direction, and the elastic force generated by the deformation maintains the elastic arm 50 providing lateral pressure to the thermal protector. Regardless of the thickness of the thermal protector, the elastic arm 50 can apply pressure to the thermal protector through deformation, thus allowing thermal protectors of different thicknesses to be installed in the mounting slot 28.

[0049] like Figure 5 As shown, a pair of resilient arms 50 are provided to support a thermal protector (not shown) in a direction transverse to the mounting direction. Each resilient arm 50 is configured to include an elongated, flat plate 52 and a support portion 54 that protrudes from the end of the plate 52 toward an interior space 38. The support portion 54 has a surface 56 that supports the thermal protector to contact the side of the mounted thermal protector. The support portion 54 is the movable end of the resilient arm 50.

[0050] Back Figure 4Plate 52 has a height h in the height direction of wall 36. Plate 52 occupies a certain height in mounting groove 28, and its height h is set to be greater than 1 / 4 of the height H of wall 36. In addition, wall 36 extends an extension 42 in the mounting direction f of the thermal protector. As shown, extension 42 is located at the bottom of wall 36. Extension 42 has a cavity 44 communicating with internal space 38. In the illustrated embodiment, extension 42 is formed into a stepped structure inside mounting groove 28 at the bottom of wall 36, so that internal space 38 becomes the first-level receiving area and cavity 44 becomes the second-level receiving area. For some thermal protectors, installation can be completed by entering internal space 38, while for others, they enter cavity 44 after passing through internal space 38. Part of the housing of these thermal protectors remains in cavity 44 to achieve installation of the thermal protector. It should be understood that it is not difficult to form the extension; it can be achieved with only slight modifications to existing molds.

[0051] Corresponding to the stepped structure, wall 36 has a first base 46 for the internal space 38, and extension 42 has a second base 48 for the cavity 44. The second base 48 is lower than the first base 46. Along the installation direction f of the thermal protector, the first base 46 is the first step, and the second base 48 is the second step. Both the first base 46 and the second base 48 serve to provide support and limit the thermal protector.

[0052] As mentioned earlier, there are several types of thermal protectors, including but not limited to traditional PTC thermal protectors and bimetallic strip thermal protectors. The internal core components of these types of thermal protectors are encased in plastic housings, which are relatively large in size, especially in terms of housing thickness. In contrast, there is a newer type of thermal protector with a simpler appearance, having a thinner profile due to the absence of a plastic housing. The latter type of thermal protector is not suitable for installation in spaces designed to accommodate the former, as the installation space is too large. In this application, the elastic arm provides additional support for the thermal protector, and the arrangement of multiple accommodating spaces is suitable for thermal protectors of varying sizes. This application provides the possibility of mounting multiple thermal protectors within the same mounting slot.

[0053] In one embodiment, the extension 42 is configured to have a cavity 44 smaller than the internal space 38, which is capable of accommodating a first thermal protector with a smaller thickness, i.e., a thin or novel thermal protector, while the internal space 38 is capable of accommodating a second thermal protector with a larger thickness, i.e., a thick or conventional thermal protector. In another embodiment, the cavity 44 is sized to match the thickness of the first thermal protector, meaning that when the first thermal protector is inserted into the mounting slot 28, the cavity 44 can surround the bottom of the first thermal protector, thereby restricting the movement of the first thermal protector.

[0054] Figure 6 and7 The installation states of the first thermal protector 32 and the second thermal protector 34 are shown respectively. Figure 6 As shown, a small portion of the first thermal protector 32 is positioned within the cavity 44, while the remaining portion is within a relatively large internal space 38. A second base 48 supports the first thermal protector 32, and an elastic arm 50 is stretched open to produce a small deformation, thereby providing lateral support to the first thermal protector 32. Figure 7 As shown, the second thermal protector 34 is positioned in the internal space, the first base 46 supports the second thermal protector 34, the elastic arm 50 is stretched open to produce a large deformation, and the flanges on one side and the opposite side of the second thermal protector 34 are constrained between the elastic arm 50 and a side wall (not shown) opposite to the elastic arm 50.

[0055] Once the thermal protector's pins are connected to the circuit, the thermal protector will not easily leave its mounting slot. Figure 6-7 In the embodiment shown, the thermal protector is limited laterally by an elastic arm, limited at the bottom by the bottom of the mounting groove, namely the second base 48 and the first base 46, and limited at the top by the connected pins (not shown) of the thermal protector at the opening.

[0056] Back Figure 5 as well as Figure 2-3 The elastic arm 50 is located on one side of the mounting groove 28. In the illustrated embodiment, the elastic arm 50 extends directly from the first side 20 and forms the mounting groove 28 with the walls of the other sides. Figure 4 As shown, the mounting groove 28 is integrated on the substrate 18, wherein the opening 40 of the wall 36 is located on the first side 20, and the first base 46 and the second base 48 are located on the second side 22. The mounting groove 28 is distributed on both sides of the substrate 18, which reduces the height of the mounting groove 28 protruding from the substrate 18 compared to it being distributed on only one side of the substrate 18.

[0057] In addition, heat dissipation holes 58 are provided on the side wall opposite the elastic arm 50, see Figure 5 The second base 48 also has additional ventilation holes 60, see... Figure 6 In the illustrated embodiment, the mounting groove 28 is located at the edge of the substrate 18, thus close to the metal housing of the brush holder 14. These heat dissipation holes, especially the heat dissipation holes 58 on the side wall, can promptly transfer the heat of the thermal protector to the metal housing.

[0058] According to the concept of this application, more steps can be set in the extension section to divide it into multiple different cavities to accommodate various thermal protectors.

[0059] like Figure 8As shown, the first baffle 62 is formed to protrude from the second side 22 of the substrate and connect to the outside of the mounting groove 28. A pair of first baffles 62 can be provided. One of the first baffles 62 is located between the circuit board (not shown) and the bearing hole 26 of the brush holder, for preventing toner from the brush from falling onto the circuit board. In the illustrated embodiment, the first baffle 62 is a vertical wall 66 and is integrated into the outside of the mounting groove 28, isolating the circuit board and the bearing hole 26.

[0060] like Figure 9 As shown, the second barrier 68 is formed to protrude from the first side 20 and covers the process holes (not shown, obscured by the second barrier) on the substrate that pass through the first and second sides. In the illustrated embodiment, the second barrier 68 is a protrusion 70 and is conical in shape to facilitate drafting. Toner can travel through the process holes from the first side 20 shown in the figure to the second side where the circuit board is located, which is the back of the brush holder not visible in the figure. The second barrier 68 largely blocks this path of toner travel.

[0061] The first baffle 62 and the second baffle 68 are both integrated into the brush holder. These baffles can be formed by modifying the mold used to form the brush holder. By setting the first baffle 62 and the second baffle 68, the circuit board and its electronic components can be protected from toner contamination, thereby ensuring normal circuit operation and extending the service life of each component.

[0062] Other barriers can also be integrated into the brush holder, for example, by placing barriers around important sensors. The location and form of the barriers depend on the object to be protected.

[0063] The circuit board is positioned on the second side 22 of the substrate. Several pins 64 and 65 are provided on the second side 22 for positioning the circuit board. One of these positioning pins 65 has a different structure from the other pins 64. Figure 8 and Figure 10 The pin 65 has a guide section 72 for the circuit board to pass through, a positioning stage 74 to stop the circuit board from continuing to pass through, and an additional mating section 76 between the guide section 72 and the positioning stage 74. The mating section 76 is configured to tightly engage with a hole in the circuit board, thereby preventing the circuit board from falling out, especially when the circuit board is in an inverted state. In the illustrated embodiment, the mating section 76 is constructed as a plurality of portions extending from a cylinder of the pin, wherein the dimensions of the cylinder of the pin are substantially the same as those of the guide section 72. Figure 11This is a schematic diagram of one embodiment of the pin's cross-section. As shown, the dashed circle is internally divided into the pin's cylinder or guide section 72, and the portion between the dashed and solid circles is the aforementioned extended portion 78. These portions 78 fill the space between the positioning hole 80 and the pin's cylinder, which is the same size as the guide section 72. Each extended portion 78 has an arcuate outer surface following the corresponding contour of the positioning hole 80. In the illustrated embodiment, the extended portion 78 consists of four ribs with large-area rounded corners. Multiple extended portions 78 are combined into a square body and mate with the circular positioning hole 80 of the circuit board.

[0064] like Figure 12 As shown, the circuit board 24 has an irregular profile. In the illustrated embodiment, the circuit board is similar to a "D" shape, with its right-angled side inside the brush holder 14 and its curved side following the edge of the brush holder 14. The bearing hole 26 has a portion cut out circumferentially to form a notch 82 that mates with the right-angled side. It can be seen that the circuit board 24 does not occupy the entire area of ​​the brush holder 14 but rather nearly half of it. The electronic components required for the brush holder 14 are concentrated on the circuit board. These electronic components include, but are not limited to, various capacitors, varistors, resistors, Hall sensors, and sensors. Therefore, the circuit board 24 has a high degree of integration, and the surface of the brush holder 14 appears clean and simple.

[0065] The brush holder 14 integrates a socket 84 on its radially outer side for connection to an external plug. Terminals 86 and 87 are provided on the socket 84, connecting the socket 84 to the circuit board 24. These terminals have pins soldered to the circuit board and can be used for power supplies or electronic components such as Hall effect sensors. In one embodiment, the power supply terminal pins are configured to have the same shape, and the Hall effect (sensor) terminal pins are configured to have the same shape. Figure 13-14 This is a schematic diagram of one embodiment of power terminal 86 and Hall effect terminal 87, with pins 88 and 89 of the same shape soldered onto a circuit board. Terminals 86 and 87 are configured to be pressed into slots in a socket 84. In the illustrated embodiment, each terminal 86 and 87 has a protruding hook 90. ​​Correspondingly, as... Figure 15 As shown, a step 94 is provided in the groove 92 of the socket 84, and an inclined surface 96 is provided for guiding the hook 90. ​​After the hook 90 passes over the step 94, the hook 90 abuts against the step 94, thereby realizing the installation of the terminal 86 (87) in the groove 92. This application changes the terminal installation process. Traditionally, terminals are assembled into sockets through injection molding, but in this application, the injection molding process can be omitted. Through structural design, the terminal can be assembled into the socket after molding. Figure 16 This is a schematic diagram of the brush holder 14 with terminals 86 and 87 already installed.

[0066] Although specific embodiments of this application have been shown and described in detail to illustrate the principles of this application, it should be understood that this application may be implemented in other ways without departing from such principles.

Claims

1. An electric motor, characterized in that: include: A brush holder (14) is disposed between the magnetic pole housing (12) and the transmission component. The rotor passes through the brush holder (14) and is connected to the transmission component. The brush holder (14) is provided with a mounting groove (28). The mounting groove (28) has a wall (36) that defines an internal space (38). The top of the mounting groove (28) has an opening (40). The thermal protector is installed into the internal space (38) through the opening (40). The wall (36) is provided with an elastic arm (50). The elastic arm (50) is elastically deformed and abuts against the side of the thermal protector.

2. The motor according to claim 1, characterized in that: The elastic arm (50) includes an elongated plate (52) having a height (h) in the height direction of the wall (36), the height (h) of the plate (52) being greater than 1 / 4 of the height (H) of the wall (36); the brush holder (14) is formed of plastic by injection molding.

3. The motor according to claim 1, characterized in that: The mounting slot (28) is configured such that the thermal protector is limited in the mounting slot (28) by the bottom of the mounting slot (28), the elastic arm (50), and the connected pins of the thermal protector at the opening (40).

4. The motor according to claim 1, characterized in that: The wall (36) extends into an extension (42) at the bottom of the mounting groove (28). The wall (36) has a first base (46). The extension (42) has a cavity (44) smaller than the internal space (38) and a second base (48) lower than the first base (46). The second base (48) is configured to support the first thermal protector (32), while the first base (46) is configured to support a second thermal protector (34) of a different size from the first thermal protector (32).

5. The motor according to claim 2, characterized in that: The elastic arm (50) is located on one side wall of the mounting groove (28), and the elastic arm (50) includes a support (54) protruding from the end of the plate (52) toward the interior space (38), the support (54) having a surface (56) against which the side of the thermal protector rests; and a heat dissipation hole (58) is provided on the other side wall opposite to the side wall.

6. The motor according to claim 1, characterized in that: The mounting groove (28) is integrated on the brush holder (14), which includes a substrate (18) having a first side (20) for arranging brushes and a second side (22) relative to the first side (20), on which a circuit board (24) is arranged; the elastic arm (50) is formed to protrude from the first side (20); a first baffle (62) is formed to protrude from the second side (22) and is connected to the outside of the mounting groove (28), the first baffle (62) being located between the circuit board (24) and a bearing hole (26) of the brush holder (14), wherein the rotor is supported by a bearing in the bearing hole (26).

7. The motor according to claim 6, characterized in that: The second barrier (68) is formed to protrude from the first side (20) to cover the process hole on the substrate (18) that runs through the first side (20) and the second side (22).

8. The motor according to claim 6, characterized in that: The second side (22) is provided with a plurality of pins (64, 65) for positioning the circuit board (24), wherein any one of the pins is constructed having a guide section (72) for the circuit board (24) to pass through, a positioning platform (74) for stopping the circuit board (24) from continuing to pass through, and a mating section (76) between the guide section (72) and the positioning platform (74), the mating section (76) being tightly fitted with the positioning hole (80) of the circuit board (24); the mating section (76) is constructed as a plurality of portions (78) extending from the cylinder of the pin (65) to fill the space between the positioning hole (80) and the pin (65), each portion (78) having an arcuate outer surface following the corresponding contour of the positioning hole (80).

9. The motor according to claim 6, characterized in that: The circuit board (24) is constructed with an irregular profile; the bearing hole (26) has a notch (82) in the circumferential direction in which a portion of it is cut off to match a portion of the profile of the circuit board (24), the other portion of the profile of the circuit board (24) following the shape of the brush holder (14).

10. The motor according to claim 1, characterized in that: The brush holder (14) has a socket (84) integrated on its radially outer side, and a plurality of terminals (86, 87) with pins (88, 89) are connected between the socket (84) and the circuit board (24) mounted on the brush holder (14) by means of being pressed into the slots (92) of the socket (84).

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