JP2006304489A - Brushless motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a brushless motor with a stator for accurately positioning a connection crossover at a power supply terminal in a motor circuit, and preventing a displacement of the connection crossover in a process for assembling the brushless motor. <P>SOLUTION: A core holder 41 for composing the stator in the brushless motor is provided with an opening 42, and positioning steps 43-47 for protruding from an end face on the motor board 60 side in the direction of a motor board 60 and defining a gap between the motor board 60. Steps 43a, 44a, 44b, 45a, 45b, 46b for the connection crossover are formed, connected to side faces of the positioning steps 43-47 on the salient-pole side and have a height lower than the positioning steps 43-47. The connection crossover is routed and abuts on the salient-pole side of the steps disposed so as to pass through a position connected to the power supply terminal in the motor circuit. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a stator of a brushless motor used in various office automation equipment, information equipment, a video tape recorder, and the like, and a coil winding of the stator.

  With the miniaturization and thinning of office automation equipment and information equipment, there is an increasing need for miniaturization and flattening of brushless motors used. Furthermore, further cost reduction is required due to the increase in usage and population.

Among them, the winding terminal process takes time and is a factor of cost increase. On the other hand, there has been proposed a method of connecting the stator coil crossover wire and the power supply terminal of the motor board without metal pins (hereinafter, the connection wire between the salient poles and connecting to the power supply terminal of the motor board. (The crossover is described as “connection crossover.”) (For example, refer to Patent Document 1.)
As shown in FIG. 6, in a stator core 81 in which a stator coil winding is wound around a plurality of salient poles 83, openings 82 a, 82 b, and 82 c are provided on the base side of the salient pole 3 of the stator core 81. The connecting wire between the salient poles of the stator coil winding is wound around a specific salient pole, and the transition portion to the next phase of the stator coil winding is passed above or below the openings 82a, 82b, 82c, and passes through the opening. The wire is a power-supplied part of the stator coil winding. In connecting the connecting crossover wire between the salient poles passing above or below the opening provided in the stator core and the power-supplied portion, 86Ve and 86Ws of the crossover wire 86 are soldered and then the space between them is cut.

Another method for connecting a connecting wire for connecting a stator coil to a power supply terminal of a motor board without using a metal pin has also been proposed. (For example, see Patent Document 2.)
In the invention disclosed in Patent Document 2, the connecting wire between the salient poles passing above or below the opening provided in the stator core according to the invention of Patent Document 1 runs vertically and horizontally, whereas the winding of the winding to the salient pole is performed. The connecting path between the phases is changed into a substantially triangular shape, and the middle of the connecting lines on each side is cut and connected to the power supply terminal of the motor board.

JP-A-6-225488 Japanese Patent No. 3396801

  However, in the inventions disclosed in Patent Documents 1 and 2, since the connecting jumper connecting the salient poles with a straight line is used, there is a problem that the degree of freedom of so-called wiring is low, and the wiring to be connected is accurately placed at a predetermined position. There is a problem that it cannot be placed. In order to reduce the time required by downsizing the board and automating the wiring soldering process, connection points are provided where necessary in the design, and the wiring to be connected is accurately placed at a predetermined position. There is a need.

  On the other hand, in the connecting jumper connecting the salient poles of Patent Documents 1 and 2 with a straight line, the wiring position is regulated by the arrangement of the salient poles to be connected. Further, in the method of changing the winding path of the winding to the salient pole in Patent Document 2, if the connecting jumper is connected between the closer salient poles, the connecting jumper and other salient poles as in Patent Document 1 are used. The problem is that the crossover lines are close. Further, the connecting crossover wire is cut and soldered. Since the connecting crossover will be displaced due to the cutting, it is necessary to reposition when soldering, which will increase the work time and require a complicated device to automate, leading to an increase in cost. Become.

  Moreover, in patent document 1, although the winding guide is disclosed as a method of giving a slack to the connecting connecting wire connected to the power supply terminal of the motor board, it is necessary to remove the winding guide after completion of the winding. There is a possibility that the connecting crossover may be misaligned and the connecting crossover may be disconnected. As a result, it is necessary to correct the positional deviation of the wiring every time, and there are problems that workability is poor, it is difficult to automate, and there is a risk of poor connection between the power supply terminal and the connecting jumper.

  Accordingly, an object of the present invention is to provide a stator in which the connecting jumper can be accurately arranged at the position of the power supply terminal of the motor circuit and the connecting jumper is prevented from being displaced in the assembly process of the brushless motor.

  In order to achieve such an object, the invention according to claim 1 is characterized in that n-phase windings (n is an integer of 2 or more) and m windings each having m windings per phase (m is In a brushless motor including a stator core having a stator core having a positive integer) salient pole and a core holder fitted to the stator core, the core holder is provided with a stepped portion protruding from the surface in the direction of the rotation axis of the motor. The connecting connecting wire of the winding connected to the power supply terminal of the motor circuit is routed between different salient poles so as to abut on the salient pole side of the stepped portion.

  Therefore, the connecting jumper wire is routed by contacting the stepped portion arranged so as to pass through the position where it can be connected to the power supply terminal of the motor circuit, so that the connecting jumper wire can be arranged at the position of the power supply terminal of the motor circuit. In addition, since the wiring is routed so as to contact the stepped portion, the possibility that the connecting connecting wire is displaced from the connection position with the power supply terminal in the motor assembling process can be greatly reduced.

  Furthermore, the invention according to claim 2 has a stepped portion on the salient pole side of the stepped portion of the core holder, and the connecting connecting wire passing through the stepped portion is connected to the motor connecting the connecting wire connecting between the salient poles of the stator core. It is close to the power supply terminal of the circuit.

  Therefore, since the connecting jumper can be guided to a position where it can be easily soldered to the power supply terminal, the connecting jumper can be soldered without being cut, and the workability is improved. In addition, since the connecting wires other than the connecting connecting wire are separated from the power supply terminal, the possibility of a short circuit due to the solder bridge can be reduced.

  According to a third aspect of the present invention, the core holder has an opening, and the opening is provided including a position for connecting the power supply terminal of the motor board and the connecting jumper.

  The opening has a function as a window for visually confirming the soldering state and a window function for manual soldering, and it is easy to check the soldering operation and the soldering state.

  In the invention of claim 4, the winding start terminal and the winding end terminal of the n-phase (n is an integer of 2 or more) stator coil winding are fixed to the core holder.

  In the present invention, the winding start terminal and winding end terminal of the stator coil winding are not used for electrical connection. Therefore, in the winding process of the stator coil, the winding start terminal and the winding end terminal can be permanently fixed to the core holder, and there is no possibility of the winding terminal being unwound in the motor assembly process. Can reduce defects.

  Furthermore, in the invention according to claim 5, a total of nm (m is a positive integer) bumps in which n-phase (n is an integer of 2 or more) windings and m windings are provided for each phase. In a brushless motor including a stator core having poles and a stator including a core holder fitted to the stator core, the core holder is configured to hold a step portion protruding from the surface in the direction of the rotation axis and the winding in the air. Each of the stepped portions or a space provided between the stepped portions, and the connecting jumper connected to the power supply terminal of the motor circuit is differently protruded so as to contact the salient pole side of the stepped portion. In addition to being routed between the poles, the common processing crossover wire of the winding is electrically connected to the other common processing crossover wires in the space.

  Therefore, since so-called Y connection common processing is performed in the space, there is no need to provide a common processing power supply terminal or common connection wiring in the motor circuit, and circuit board miniaturization and common processing can be performed all at once. Thus, the conductive connection can be made with solder or the like.

  According to a sixth aspect of the present invention, the common processing connecting wire is electrically connected to another common processing connecting wire in a state where the common processing connecting wire is lifted by the stepped portion so as to be positioned in the space portion.

  Therefore, it is easy to distinguish between a winding (crossover wire) connecting other salient poles and a common processing crossover wire of the winding, and a connection error can be prevented. Further, since the step is held in the air, the core holder can be connected in the space without providing an opening, so that the degree of freedom in arranging the common processing crossovers is improved.

  As described above, according to the brushless motor of the first aspect, the connecting jumper can be arranged at a predetermined position and is routed so as to contact the stepped portion. Can be reduced. In addition, it is easy to make the routing route different from other crossovers connecting the salient poles of the stator core.

  Therefore, it is possible to accurately place the connecting jumper at the position of the power supply terminal of the motor circuit, and it is difficult for the motor assembly process to be displaced. Therefore, it is easy to improve the efficiency of connection work such as soldering and to automate the soldering work. . Further, since it can be routed without being brought close to other crossovers connecting the salient poles of the stator core, there is little possibility of mistakes in wiring by connection such as soldering, and defects can be reduced. Furthermore, since the step portion serving as the guiding portion for connecting the connecting jumper is provided, the degree of freedom in arranging the connection position is improved.

  According to the brushless motor of the second aspect, the position of the connecting jumper is high in positional accuracy with respect to the power supply terminal, and the power supply terminal and the connecting jumper can be brought close to each other, so that the soldering workability is improved. In addition, since the connecting wires other than the connecting connecting wire are separated from the power supply terminal, the possibility of a short circuit due to the solder bridge can be reduced. In addition, by changing the height, it becomes possible to arrange the connecting connecting wire and the other connecting wires close to each other, which is suitable for downsizing.

  According to the brushless motor according to claim 3, the opening has a function as a window for visually confirming the soldering state and a window function for the manual soldering operation, and the selectivity of the connection method is improved and checked. Becomes easy.

  According to the brushless motor of the fourth aspect, the winding start terminal and the winding end terminal can be permanently fixed to the core holder in the winding process of the stator coil. Since there is no risk of unraveling, defects during the process can be reduced.

  According to the brushless motor of the fifth aspect, since so-called Y connection common processing is performed in the space portion, there is no need to provide a common processing power supply terminal or common connection wiring in the motor circuit. Miniaturization and common processing connection can be made by solder etc. at a time.

According to the brushless motor of the sixth aspect, it is easy to distinguish between a winding (crossover wire) connecting other salient poles and a common processing crossover wire of the winding, and a connection error can be prevented. Further, since the step is held in the air, the core holder can be connected in the space without providing an opening, so that the degree of freedom in arranging the common processing crossovers is improved.

Hereinafter, the configuration of the present invention will be described in detail based on the best mode shown in the drawings.
(Motor structure)

  1A and 1B show a brushless motor to which the present invention is applied, in which FIG. 1A is a top view, and FIG. In FIG. 1, the brushless motor 1 has a motor substrate 60 in which an iron substrate is glass-glazed, and a resin bearing holder 31 that holds two bearings 34 and 35 is attached to the motor substrate 60. A rotary shaft 32 rotatably supported by bearings 34 and 35 is fitted into the bearing holder 31, and a stopper 33 having a retaining function is attached to the rotary shaft 32. Further, the stator 2 is attached to the motor substrate 60 so as to surround the bearing holder 31 concentrically. A ring-shaped drive magnet 13 is arranged so as to oppose the outer peripheral edge of the stator 2 through a slight gap. The drive magnet 13 is attached to the inner peripheral surface of the motor case 11 attached to the motor substrate 60 with the upper body facing the opening end. A ring-shaped FG magnet is attached to the outer periphery of the motor case 11. The motor case 11, the FG magnet 12, and the drive magnet 13 constitute the rotor unit 10. One end of the rotating shaft 32 is integrally attached to the pulley 14 formed at the center of the bottom surface of the motor case 11 so that the motor case 11 rotates integrally with the rotating shaft 32.

  On the motor substrate 60, an MR sensor 61 is disposed at a position facing the FG magnet 12 magnetized in multiple poles. The motor board 60 is provided with various components (not shown) such as a motor control IC 62, an input / output line 63, a hall element for controlling the motor, a Zener diode, and a circuit pattern (not shown). .

  Next, the assembly of the stator core 21, the stator coil 22, and the core holder 41 constituting the stator 2 will be described with reference to FIG. 2A and 2B show the positional relationship between the stator 2 and the motor substrate 60, where FIG. 2A is a front view of the main part, and FIG. 2B is a cross-sectional view of the main part of the E-F-G part. In the brushless motor 1 of the present embodiment, the stator 2 is disposed on the end side of the motor substrate 60. In the stator 2, a stator coil winding is wound around a salient pole of a stator core 21, and a stator coil 22 is wound in three phases.

  The stator core 21 is formed by laminating a plurality of core sheets made of silicon steel, and each is fixed. The salient poles of the stator core 21 and the base side of the salient poles are coated with insulation to prevent the stator coil winding from shorting to the stator core 21. A substantially circular opening is provided at the center of the stator core 21, and the core holder 41 is press-fitted from the motor substrate 60 side. The core holder 41 is preferably made of an insulating material such as resin.

  Note that a plurality of positioning protrusions 21 a are provided in the opening of the stator core 21. The core holder 41 is press-fitted and fixed to the stator core 21 so that the positioning overhanging portion 21a and the core holder 41 are in close contact with each other, so that the positioning (height position) of the core holder 41 with respect to the stator core 21 in the direction of the rotation axis 32 is accurately performed. I can do it. Further, the end surface of the core holder 41 is set to be higher than the end surface of the stator core 21 positioned in the direction of the rotation shaft 32. The circumferential positioning of the rotating shaft 32 of the core holder 41 with respect to the stator core 21 is performed by aligning the positioning protrusions of the core holder 41 with the core holder positioning holes 21c provided on the salient pole base side of the stator core 21, so that the circumferential position (angular position) ) Is defined.

  The position (height position) of the stator 2 and the bearing holder 31 (not shown in FIG. 2) in the direction of the rotation axis 32 is determined by inserting the bearing holder 31 with the bearings 34 and 35 from the opposite side of the motor substrate 60, The height positions of the bearing 31 and the stator 2 are defined by tightly fixing the positioning overhanging portion 21 a and the bowl-shaped positioning portion of the bearing holder 31. Further, the circumferential positioning of the rotating shaft 32 of the stator 2 and the bearing holder 31 is determined in the circumferential position (angular position) by the fixing holes 21b in which the positioning overhang portions 21a are formed. Further, the stator 2 and the bearing 31 are fastened together with the motor substrate 60 using the fixing hole 21b.

  Thus, since the stator 2 is assembled with the bearing holder 31 as a proof, the stator 2 and the drive magnet 13 are fitted into the bearings 34 and 35 when the rotating shaft 32 with the rotor portion 10 and the pulley 14 attached thereto is fitted. Can constitute a good magnetic circuit.

  Next, with respect to winding of the stator coil winding around the stator 2, routing of the connecting connecting wire and the common processing connecting wire formed on the stator 2, and connection between the connecting connecting wire and the motor circuit, FIG. This will be described in detail with reference to FIGS.

  FIG. 3A is a cross-sectional view showing the connection between the connection crossover line T1 and the power supply terminal VC formed on the motor board 60, and FIG. 3B is a cross-sectional view showing the common process using the common process crossover line. is there. FIG. 4A is a front view of the stator core 2 after the stator coil 22 is formed as viewed from the motor substrate 60 side. FIG. 4B is an enlarged front view of the core holder 41 as viewed from the motor substrate 60 side in FIG. 4A, and crossover lines are not shown for explaining the main part. FIG. 5A is a connection diagram of a three-phase coil of the stator coil 22 of this embodiment, FIG. 5B is a connection diagram of a three-phase coil using a conventional metal pin (terminal), and FIG. It is the figure which showed typically the connection diagram of the three-phase coil which performed the conventional common process.

  First, the routing of the connecting connecting wire and the common processing connecting wire formed on the stator 2 will be described in detail. Winding the salient poles of the stator 2 is performed after the core holder 41 is press-fitted into the stator core 2. The number of poles of the stator 2 of this embodiment is 3 4 and 2 4 poles. The stator coil winding consists of two windings, one winding for winding the W phase and the U phase of a three-phase coil, and the other for winding a V phase.

As shown in FIGS. 4A and 4B, the core holder 41 has a positioning step portion that defines an interval between the opening 42 and the motor substrate 60 projecting toward the motor substrate 60 on the end surface on the motor substrate 60 side. 43, 44, 45, 46, 47 are provided. Further, connecting connecting wire step portions 43a, 44a, 44b, 45a, 45b, 46b, which are connected to the salient pole side surfaces of the positioning step portions 43 to 47 and whose height of the step portions is lower than that of the positioning step portions 43 to 47, In addition, step portions 46a and 47b for common processing crossovers are formed. The positioning step portion 44 and the positioning step portion 46 are formed with guide holes for fastening the bearing holder 31 and the stator 2 together to attach the motor holder 60 to the motor substrate 60. Further, the positioning step portions 43, 44, 45, 46 are formed with convex portions that serve as positioning guides with the motor substrate 60.

  The routing of the connecting connecting lines T1, T2, and T3 will be described using the connecting connecting line T1. Each salient pole in FIG. 4A is given an initial number indicating the three-phase U, V, and W phases and a number from 1 to 8 for identifying the salient pole.

  The connecting connecting line T1 starts from the terminal S1, starts winding the windings that continuously wind the W-phase and the U-phase, winds the coil around U8 about twice, and connects the connecting connecting line that is routed from the root of U8. The positioning step portion 43a is passed through the upper surface of the stepped portion 43a while being brought into contact with the side surface of the positioning stepped portion 43 on the stepped portion 43a side from the corner portion on the salient pole side of the positioning stepped portion 43, and the positioning stepped portion on the stepped portion 44b side of the positioning stepped portion 44 It is routed through the upper surface of the stepped portion 44b to the corner on the salient pole side of the positioning stepped portion 44 while being brought into contact with the side surface of 44. Next, it is routed around the root of W5 and a winding is wound a predetermined number of times to form a coil. By connecting the connecting lines U8 to W5, the connecting connecting line T1 is formed. Similarly, the U-phase and V-phase connecting connecting wires T2 and T3 are arranged at predetermined positions by the positioning step portion and the step portion.

  Further, the opening 42 of the core holder 41 has a portion in which the bearing holder 31 is fitted, the connecting connecting wires T1, T2, T3 and the power supply terminals WC, VC, UC of the motor board 60 in the direction opposite to the motor board 60. It also has an opening for performing connection work such as soldering.

  The common processing connecting wires T4 and T5 are also routed in the same manner as the connecting connecting wires T1, T2, and T3 using the salient poles, positioning step portions, and common processing step portions.

  As shown in the cross-sectional view of the main part of the connection of the connecting jumper line T2 to the power supply terminal VC of the motor board 60 in FIG. 3A, the connecting jumper line T2 is formed by the connecting jumper step parts 45a and 46b. The connecting portion is brought close to the power supply terminal VC of the motor board 60. For this reason, it can connect with the electric power feeding terminal VC, without cutting the connecting crossover line T2. If the connecting connecting wire T2 and the power supply terminal VC can be soldered, the connecting connecting wires on the connecting connecting wire step portions 45a and 46b do not need to be in close contact with the motor substrate 60. Further, two step portions for connecting crossovers are not necessarily required, and if at least one step is provided, the same effect is exhibited. Similarly, the same effect can be obtained even if one of the connecting crossover steps is low.

  FIG. 3B is a cross-sectional view of the main part of the positional relationship between the common processing crossover lines T4 and T5, the common processing connection portion COM, and the common processing step portions 46a and 47b. The common processing connecting wires T4 and T5 that pass through the upper surfaces of the common processing stepped portions 46a and 47b are connected to the common processing connecting wires T4 and T5 by the common processing connecting portion COM. The heights of the common processing step portions 46 a and 47 b are set lower than the connection line step portions, and the common processing connection portion COM is not in contact with the motor substrate 60. Also in the common processing connection, the common processing crossover is not cut in this embodiment.

  Note that the connecting wires other than the connecting connecting wires T1, T2, T3 and the common processing connecting wires T4, T5 of the stator 2 are routed as follows.

  For example, after winding a coil around W5, when two salient poles are skipped and a crossover is routed around W4, W5 and W4 are close to each other, so the crossover drawn from the root of the salient pole of W5 is It can be routed to W4 without contacting the salient pole side surfaces of the positioning step 45 and step 45b.

For example, when eight salient poles are skipped from W5 to W2 and the crossover is routed, the direction is changed by contacting the corners on the salient pole side of the positioning step 45 and then the salient pole side of the step 45a. The side surface of the stepped portion 46b is brought into contact with the side surface on the salient pole side of the stepped portion 46b and brought into contact with the corner portion on the salient pole side of the positioning step portion 46 to change the direction, and the crossover wire is drawn around the root portion of W2 and wound around W2. Wind the wire. In this case, since the winding is routed by contacting the side surfaces of the stepped portions 45a and 46b on the salient pole side, it can be routed by changing the height and position of the connecting connecting wire.
When connecting the connecting wire from W5 to W2, the connecting wire may be extended from W5 to W4 and W3 about twice, and in this case, step portions 45b, 45a passing through the connecting connecting wire, It can be routed without contacting the side surface of the salient pole 46b.

  In the above-described embodiment, the connecting connecting wire, the common processing connecting wire, and the connecting wire connecting the salient poles are concentrated on the salient pole side of the positioning step portions 43 to 47. Thereby, the opening part of the stator 2 can be taken widely. The bearing holder 31 is preferably formed of a resin material because of its high mass productivity, but the size of the bearing holder becomes relatively large in order to prevent deformation in the molding process. For this reason, it is preferable that the opening of the stator core 2 is large. Further, although the crossovers arranged in a concentrated manner are close to each other, the positioning step portions 43 to 47, the connecting crossover step portions 43a, 44b, 44a, 45b, 45a, 46b, and the common processing step portions 46a, 47b Since the connecting connecting wire, the common processing connecting wire and the other connecting wires are separately routed in both position and height, they can be clearly distinguished. By connecting to the power supply terminals WC, UC, and VC of the motor board 60, it is possible to connect without connecting the connecting jumper wire and other jumper wires, thereby improving workability and reducing defects. Similarly, common processing can be clearly identified, so that workability can be improved and defects can be reduced.

  Further, the connecting crossover lines T1, T2, and T3 are disposed close to the power supply terminals WC, VC, and UC by the connecting crossover step portions 43a, 44b, 44a, 45b, 45a, and 46b. Will improve.

  In the common processing, the common processing connecting wires T4 and T5 are concentrated in one place, so that the common processing can be performed once, and it is not necessary to provide common processing terminals and wiring on the motor board 60. This improves workability and the degree of freedom of circuit routing.

  Next, the coil winding of the stator coil 22 of this embodiment will be described in detail. The winding starts from the winding start terminal S1 that continuously winds the W phase and the U phase, winds the coil about U8 about twice, and from the salient pole side corner of the positioning step 43 to the salient pole side of the positioning step 44 A connecting crossover wire T1 is formed by contacting the corner portion and passing through the upper surfaces of the stepped portions 43a and 44b and leading to the root portion of W5. Next, W5, W4, W3, W2, W1, W8, W7, W6 and two poles are skipped to form a coil and finish winding the W phase. Furthermore, after the connecting wire is routed from the root portion of W6 to the root portion of U5 and wound about twice, the connecting wire is routed and wound about twice by V4. The connecting wire routed from the root portion of V4 is The common processing crossover wire T4 is brought into contact with the salient pole side corner portion of the positioning step portion 47 from the salient pole side corner portion and passed through the upper surfaces of the step portions 46a and 47b to the root portion of U1 and wound about twice. Form. Subsequently, U1, U2, U3, U4, U5, U6, U7, U8 and two poles are skipped to form a coil and finish winding the U phase. Then, it is routed from the root portion of U8, wound about U2 by V1, V2, and V3, and is brought into contact with the salient pole side corner portion of the positioning step portion 45 from the salient pole side corner portion of the positioning step portion 46, and the step portion. The connection crossover line T3 is formed by passing through the upper surfaces of 46b and 45b and routing to the base portion of U5. Furthermore, it winds by U5, W6, W7, W8 about twice, respectively, and complete | finishes by the winding end terminal E1 on the core holder 41 from the root part of W8. The windings of the winding start terminal S1 and the winding end terminal E1 are cut after the winding ends.

  The winding for winding the V-phase starts from the winding start terminal S2 and is wound about twice each at V1, V8, and V7, from the salient pole side corner of the positioning step 44 to the salient pole side corner of the positioning step 45. The connecting crossover line T2 is formed by contacting and passing through the upper surfaces of the stepped portions 44a and 45b to the base portion of V4. Next, V4, V3, V2, V1, V8, V7, V6, V5 and two poles are skipped to form a coil and finish winding the V phase. Further, after the connecting wire is routed from the V5 root portion to the V5 root portion and wound about twice, the connecting wire routed from the V5 root portion is positioned from the salient pole side corner portion of the positioning step portion 46 to the positioning step portion 47. The common processing crossover wire T4 is formed by contacting the salient pole side corner portion and passing through the upper surfaces of the step portions 46a and 47b to the base portion of W1 and winding it twice. Finally, the crossover wire is routed from U1 to U1 and wound twice, and the winding ends at the winding end terminal E2 on the core holder 41. The windings of the winding start terminal S2 and the winding end terminal E2 are cut after the winding ends.

  The cut winding start terminals S1 and S2 and the winding end terminals E1 and E2 are electrically insulated and fixed to the core holder 41 by an adhesive after the coil winding process.

  Next, the common process for the three-phase coil of this embodiment will be described in detail. The stator coil winding consists of two windings, one winding for winding the W phase and the U phase of a three-phase coil, and the other for winding a V phase. As shown in the conceptual diagram of how to wind the three-phase coil in FIG. 5, the so-called Y connection has a common portion and requires common processing. In this embodiment, a three-phase coil is wound with two windings as shown in FIG. Since the W-phase and U-phase are wound with a single continuous winding, common processing with the V-phase winding may be performed at one point, so the conventional terminal shown in FIG. 5B was used. The process can be simplified with respect to the connection and the method of connecting the common portions of the three windings close to each other in FIG.

(Effect of this embodiment)
In the brushless motor configured as described above, an opening is formed in the stator core holder, a positioning step protruding in the direction of the motor substrate on the end surface on the motor substrate side, a connecting jumper step, and a common processing jumper step The connecting crossover wire is routed in contact with the salient pole side of the step portion arranged so as to pass through the position where it can be connected to the power supply terminal of the motor circuit.

  That is, the connecting jumper can be arranged at the position of the power supply terminal, and there is little possibility of causing displacement in the brushless motor assembly process. Further, it is easy to route the connecting connecting wire in distinction from other connecting wires routed to the stator. Accordingly, the workability of the connection process between the power supply terminal of the motor circuit and the wiring connecting wire is high, and the connecting connecting wire can be easily identified, so that it is possible to supply a brushless motor having a stator that is less likely to cause a failure due to a wiring mistake. Furthermore, since the step portion serving as the guiding portion for connecting the connecting jumper is provided, the degree of freedom in arranging the connection position is improved.

  Further, the connecting connecting wire is brought close to the power supply terminal of the motor board at the connecting portion by the connecting connecting wire step. The connecting jumper step can be guided to a position where the connecting jumper can be easily soldered to the power supply terminal, so that the soldering workability is improved. In addition, since the connecting wires other than the connecting connecting wire are separated from the power supply terminal, the possibility of a short circuit due to the solder bridge can be reduced. In addition, since the connecting jumper and the power feeding terminal can be arranged close to each other, the connecting jumper can be connected to the power feeding terminal without cutting. For this reason, there is no process of removing unnecessary crossovers after connection, and the connection process can be simplified.

  The winding start terminal and the winding end terminal are electrically insulated and fixed to the core holder by an adhesive after the coil winding process. As a result, in the winding process of the stator coil, the end of the winding can be permanently fixed to the core holder, and the unnecessary crossover removal process in the soldering process is not required, so the process can be simplified. Can do. In addition, since there is no possibility that the end of the winding is unwound from the stator coil formation process to the connection process between the stator coil and the motor circuit, defects during the process can be reduced.

  Further, with respect to the common processing, the core holder has a step portion protruding from the surface in the direction of the rotation axis, and a space portion provided between the step portions or the step portions so that the winding is held in the air. The connecting crossover wire connected to the power supply terminal of the motor circuit is routed between different salient poles so that the salient pole side of the stepped portion abuts, and the common processing crossover wire of the winding is Are connected to other common processing crossovers.

  Therefore, since so-called Y-connection common processing is performed in the space, there is no need to provide a common processing power supply terminal or common connection wiring in the motor circuit. It can be performed by soldering.

(Other embodiments)
The above-described embodiment is an example of a preferred embodiment of the present invention, but is not limited thereto, and various modifications can be made without departing from the gist of the present invention.

  In the present embodiment, the three-phase coil is wound with two windings, but may be implemented with three windings. For example, the W-phase winding is wound around U on the core holder 41, leaving the terminal, wound around U8 about twice, and routed to W5 via the positioning step portions 43, 44 and step portions 43a, 44b. The connecting wire T1 is formed, and then W5, W4, W3, W2, W1, W8, W7, W6 and the stator coil are wound to form the W phase. Further, while wrapping around W6, U5, and V4, each of them is wound about twice, and the connecting wire routed from the base portion of V4 is routed to the root portion of U1 via the positioning step portions 46 and 47 and the step portions 46a and 47b. It is wound about twice to form the common processing crossover wire T4. The winding is routed from W1 to W8 from the base portion of U1, and the winding of the W phase is finished on the core holder 41 by winding twice with W8.

  The U-phase winding is wound around the core holder 41, leaving a terminal, wound around W1 twice, and routed to U4 via the positioning step portions 47 and 46 and the step portions 47b and 46a. A common processing crossover is formed. Next, U4, U5, U6, U7, U8, U1, U2, U3 and the stator coil are wound and a U phase is formed. Further, the winding is routed from the root portion of U3 to U5 via the positioning step portions 46, 45 and 46b, 45a to form the connecting jumper T3. Finally, U5, U6, U7, and V7 are drawn and wound about twice each to finish winding the U-phase winding on the core holder 41.

  The V-phase winding is formed by the same winding method as the V-phase in FIG.

  As described above, when a three-phase coil is wound with three windings, the three common processing crossovers overlap in the common processing unit, but can be connected by one soldering because they pass through the same position. .

  When winding a three-phase stator coil continuously with one winding, the winding end terminal E1 of the first winding of the core holder 41 in FIG. First, it becomes possible by providing a protrusion (not shown) around the fixing portion of the terminal S2. If the 1st coil | winding which wound W, U phase of FIG. 4 (A) continuously is wound around the said projection part (not shown) and the 2nd V phase is wound, it will start from winding start terminal S1. Up to the winding end terminal E2, the stator coil can be formed in the same order as in FIG. In addition, after winding is complete | finished, in order to isolate | separate U phase and V phase with the said projection part (not shown), winding is cut | disconnected.

  As described above, by providing the guide portion in the core holder 41, the connecting jumper wire can be provided at a predetermined position regardless of whether the number of three-phase stator coil windings is one, two, or three. They can be formed and common processes can be connected together.

  Moreover, the place where the winding start terminal and winding end terminal of the winding of the stator coil adhere may be on the insulating coating film formed on the base side of the salient pole part of the stator core.

Bakelite, paper phenol, or glass epoxy may be used for the motor substrate that constitutes the motor circuit.

1 is a brushless motor to which the present invention is applied, in which (A) is a top view and (B) is a cross-sectional view of a main part. The positional relationship of the stator and motor board | substrate of a brushless motor to which this invention was applied is shown, (A) is a principal part front view, (B) is a principal part sectional drawing. It is a figure which shows the connection of the stator coil and motor circuit to which this invention was applied, and a common process, (A) is sectional drawing which shows the connection of the connecting crossover and the electric power feeding terminal formed in the motor board | substrate, B) is a cross-sectional view showing common processing of a common processing crossover wire. It is a figure which shows the stator part of the brushless motor to which this invention was applied, (A) is the front view seen from the motor substrate 60 side after forming a stator coil, (B) is the motor of the core holder 41 of (A). An enlarged front view as seen from the substrate side, and a crossover is not shown in order to explain the main part. It is a schematic diagram of the connection of a three-phase coil, A) is a connection diagram of a three-phase coil of a stator coil of the present embodiment, (B) is a connection diagram of a three-phase coil using a conventional metal pin (terminal), ( C) is a connection diagram of a three-phase coil subjected to conventional common processing. The figure which shows an example of the conventional stator.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Brushless motor 2 Stator 21 Stator core 31 Bearing holder 32 Rotating shaft 41 Core holder 43, 44, 45, 46, 47 Positioning step part 43a, 44a, 44b, 45a, 45b, 46b Connecting jumper step part 46a, 47b Common processing Step portion for connecting wire 60 Motor board E1, E2 End of winding terminal S1, S2 Starting terminal of winding T1, T2, T3 Connecting connecting wire T4, T5 Common processing connecting wire WC, VC, UC Power supply terminal

Claims (6)

a stator core having n-phase (n is an integer of 2 or more) windings, and a total of nm (m is a positive integer) salient poles each provided with m windings per phase, and fitted to the stator core In a brushless motor having a stator composed of a combined core holder, the core holder is provided with a stepped portion projecting from the surface in the direction of the rotation axis of the motor, and a connection for connecting the windings connected to the power supply terminal of the motor circuit A brushless motor characterized in that a wire is routed between different salient poles so as to abut on the salient pole side of the stepped portion. The core holder has a stepped portion for guiding the winding provided on the salient pole side of the stepped portion in a predetermined direction, and the connecting jumper of the winding is fed by the stepped portion to the power supply of the motor circuit. The brushless motor according to claim 1, wherein the brushless motor is led to a terminal. The core holder has an opening, and the opening is provided including a position for connecting the power feeding terminal of the motor circuit and the connecting connecting wire of the winding passing through the stepped portion. The brushless motor according to claim 1, wherein the brushless motor is characterized. The winding start terminal and the winding end terminal of an n-phase (n is an integer of 2 or more) stator coil winding are fixed to the core holder. One of the brushless motors described. a stator core having n-phase (n is an integer of 2 or more) windings, and a total of nm (m is a positive integer) salient poles each provided with m windings per phase, and fitted to the stator core In a brushless motor having a stator composed of a combined core holder, the core holder includes a step portion protruding from the surface in the direction of the rotation axis, and the step portion or the step portion and the step portion so that the winding is held in the air. Between the different salient poles so that the connecting connecting wire connected to the power supply terminal of the motor circuit contacts the salient pole side of the stepped portion, A brushless motor, wherein a common processing crossover wire of a winding is electrically connected to another common processing crossover wire in the space portion. 6. The brushless motor according to claim 5, wherein the common processing connecting wire is electrically connected to another common processing connecting wire in a state where the common processing connecting wire is lifted so as to be positioned in the space by the stepped portion.

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