JP6846961B2 - motor - Google Patents

Description

The present invention relates to a motor that supplies power to a coil via a wiring board.

In a motor in which a stator and a rotor are housed in a motor case, a coil winding and a lead wire for power supply are connected to a wiring board arranged in the motor case, and power is supplied to the coil via a wiring pattern on the wiring board. There is something. The motor of Patent Document 1 uses a four-layer printed circuit board as a wiring board, and has a wiring pattern formed on the surface layer of the four layers and U-phase, V-phase, and W formed on the other three layers. It has a phase wiring pattern. The connection between the wiring pattern of each phase and the corresponding coil is made via terminal pins attached to through holes penetrating the four layers. The terminal pin is press-fitted into the insulator, and the winding drawn from the coil is entwined with the terminal pin. The wiring pattern of each phase is connected to the wiring pattern provided on the surface layer via the terminal pin, and the U-phase, V-phase, and W-phase coils are Y-connected.

Japanese Unexamined Patent Publication No. 2001-314506

FIG. 10 is an explanatory diagram of a wiring board provided with a wiring pattern for Y-type connection, and FIGS. 10A to 10C show a U-phase wiring pattern 185U, a V-phase wiring pattern 185V, and a W-phase wiring pattern, respectively. It shows 185W. Further, FIG. 10D shows a wiring pattern 185A provided on the surface layer of the wiring board. As shown in FIGS. 10A to 10D, when the wiring pattern is formed so as to connect the three-phase coils in a Y shape, the pattern width cannot be increased. Further, the wiring board is provided with lands for connecting lead wires, but in the conventional wiring board shown in FIG. 10, lands are formed in a portion protruding from the annular portion where the wiring pattern is formed to the outer peripheral side. .. Therefore, the pattern width of the portion extending from the annular portion to the fixed position of the lead wire becomes narrow.

If the pattern width of the wiring pattern is narrow, the wiring pattern may burn out when a large current flows. For example, if the motor is driven at a low voltage, such as when it is driven by a battery, a large current may flow and the wiring pattern may be burnt out. As a wiring method that does not cause burning even with a large current, there is a method of wiring with a bus bar, but this causes an increase in cost.

In view of the above problems, an object of the present invention is to prevent burning of the wiring pattern of the wiring board to which the coil windings and lead wires are connected.

In order to solve the above problems, the present invention comprises a rotor provided with a magnet, a stator core arranged on the outer peripheral side of the rotor, a three-phase coil wound around the stator core, and windings and leads of the coil. The wiring board to which the wires are connected and the motor case accommodating the stator core are provided, and the number of slots N of the stator core and the number of poles M of the magnet are as follows: N = 3 × n and M. = 2 × n or 4 × n (n is an integer of 1 or more), and the wiring board includes four wiring layers laminated via an insulating layer, and three of the wiring layers. Each has a wiring pattern to which in-phase coils are connected, the other one layer is a surface layer provided on the surface of the wiring substrate, and the lead wire is electrically connected to the surface layer. A wiring pattern connecting the land and the wiring pattern of the three layers is formed, and the wiring pattern formed in the three layers and the wiring pattern formed in the surface layer form the three-phase coil. Is characterized by being delta-connected.

According to the present invention, a three-phase coil can be delta-connected via a wiring pattern formed on a wiring board. When the number of slots N is 3 × n and the number of poles M of the magnet is 2 × n or 4 × n, when the wiring pattern is formed so as to make a delta connection of the coils, the wiring pattern is formed so as to make a Y-shaped connection. The pattern width can be made thicker than that. Therefore, there is little possibility that the wiring pattern will be burnt out when a large current flows. Therefore, even if the motor is used at a low voltage, the wiring pattern can be prevented from burning.

In the present invention, it is desirable that the wiring board includes an annular wiring pattern forming portion, and the wiring pattern and the land are provided on the wiring pattern forming portion. In this way, when the lead wire is pulled into the annular wiring pattern forming portion and electrically connected to the land, it is not necessary to narrow the pattern width of the portion connecting the land and the wiring pattern. Therefore, there is little possibility that the wiring pattern will be burnt out when a large current flows.

In the present invention, each of the three layers has a wiring pattern provided with an annular region provided on the inner peripheral side of the wiring pattern forming portion and a protruding region protruding from the annular region to the outer peripheral side. The protruding region has two through holes adjacent to each other in the circumferential direction, and the surface layer has a wiring pattern for connection in which a plurality of connection regions having two through holes adjacent to each other in the circumferential direction are arranged in the circumferential direction. It is preferable to prepare.

In the present invention, it is desirable that the wiring board includes an arm portion protruding from the wiring pattern forming portion to the outer peripheral side, and the lead wire is fixed to the arm portion. In this way, when the lead wire is pulled, it is difficult for the force to be transmitted to the fixed portion between the land and the lead wire. Therefore, there is little possibility that the lead wire will be unfixed. Further, it is desirable that the arm portion includes a constricted portion connected to the wiring pattern forming portion and a wide portion having a width wider in the circumferential direction than the constricted portion. In this way, when the lead wire is fixed to the arm portion by the fixing member, there is little possibility that the fixing member will come off from the arm portion.

In the present invention, it is desirable that a portion of the lead wire drawn out to the outside of the motor case is fixed to the outer surface of the motor case. In this way, when the lead wire is pulled, it is difficult for the force to be transmitted to the fixed portion between the land and the lead wire. Therefore, there is little possibility that the lead wire will be unfixed.

In the present invention, it is desirable to provide an adhesive layer that covers the land and the portion of the lead wire fixed to the land. In this way, the adhesive can strengthen the fixation of the lead wire. Therefore, there is little possibility that the lead wire will be unfixed. Further, in this case, it is desirable that the adhesive layer is made of an insulating adhesive. In this way, the land and the lead wire can be insulated from other members. Therefore, it is possible to prevent a short circuit between the lead wires and a short circuit between the lead wire and another member.

In the present invention, it is desirable that all the coils wound around the stator core have the same winding direction of the windings in the slots. In this way, the stator can be easily manufactured.

According to the present invention, the number of slots N is 3 × n, the number of poles M of the magnet is 2 × n or 4 × n, and the three-phase coils are fed to the coils by using a wiring pattern for delta connection. The pattern width can be made wider than when power is supplied to the coil by using a wiring pattern in which the coil is connected in a Y shape. Therefore, there is little possibility that the wiring pattern will be burnt out when a large current flows. Therefore, the motor can be used at a low voltage.

It is sectional drawing of the motor which concerns on this invention. It is an exploded perspective view of a motor part. It is a top view which looked at the rotor and the stator from the counter-output side. It is a top view which looked at the wiring board from the non-output side. It is a perspective view and a plan view of a cover member. It is explanatory drawing of the state in which the three-phase coil is delta-connected by the wiring board. It is explanatory drawing of the U-phase wiring layer. It is explanatory drawing of the V-phase wiring layer. It is explanatory drawing of the W phase wiring layer. It is explanatory drawing of the wiring board provided with the wiring pattern for Y type connection.

(overall structure)
Hereinafter, embodiments of a motor to which the present invention is applied will be described with reference to the drawings. FIG. 1 is a cross-sectional view of the motor 1 according to the present invention. In the present specification, of one side and the other side of the axial direction L of the motor 1, the side on which the output shaft 100 of the motor 1 protrudes is defined as the output side L1, and the side opposite to the side on which the output shaft 100 protrudes is defined as the output side L1. It is set to the non-output side L2. The output shaft 100 of the motor 1 is provided at the end of the output side L1 of the rotating shaft 10 extending in the axial direction L at the center of the motor 1.

In the motor 1, the motor unit 2, the electromagnetic brake 3, and the encoder 4 are arranged in this order from the output side L1 of the rotating shaft 10 toward the counter-output side L2. The motor unit 2 and the electromagnetic brake 3 are housed in the motor case 5. The encoder 4 is housed inside the encoder cover 6 attached to the end surface of the counter-output side L2 of the motor case 5. The encoder cover 6 includes a bottom portion 61 facing the end surface of the counter-output side L2 of the motor case 5, and a side wall portion 62 rising from the outer peripheral edge of the bottom portion 61 toward the motor case 5. The gap between the tip of the side wall portion 62 and the motor case 5 is sealed by the sealing material 7.

The motor case 5 is made of a metal such as aluminum. The motor case 5 includes a square tubular core holder 51 that surrounds the outer peripheral side of the motor portion 2, a thick bearing holder 52 that is attached to the output side end of the core holder 51, and the outer peripheral side and the non-output side of the electromagnetic brake 3. A brake case 53 surrounding L2 is provided. The rotating shaft 10 can be rotated by an output side bearing 11 held in a recess formed in the center of the bearing holder 52 and a counter-output side bearing 12 held in a recess formed in the center of the bottom of the brake case 53. Be supported. The output side bearing 11 and the counter output side bearing 12 are ball bearings in which a rollable ball is held between the inner ring and the outer ring.

The brake case 53 includes a thick bottom portion 54 that holds the counter-output side bearing 12, and a tubular portion 55 that rises from the outer peripheral edge of the bottom portion 54 toward the core holder 51. At the tip of the tubular portion 55, a small diameter portion 551 that fits on the inner peripheral side of the core holder 51 is formed. Further, an annular rib 521 that fits on the inner peripheral side of the core holder 51 is formed on the outer peripheral edge of the surface of the bearing holder 52 on the opposite output side L2. When assembling the motor case 5 by assembling the bearing holder 52 and the brake case 53 to both ends of the core holder 51, the gap between the outer peripheral surface of the small diameter portion 551 and the annular rib 521 and the inner peripheral surface of the core holder 51 is sealed by an O-ring (not shown). To.

The rotating shaft 10 includes a motor-side rotating shaft 13 having an output shaft 100 protruding from the bearing holder 52 to the output-side L1, and an encoder-side rotating shaft 14 fixed to the end of the counter-output side L2 of the motor-side rotating shaft 13. Be prepared. The encoder-side rotary shaft 14 projects from the bottom 54 of the brake case 53 to the inside of the encoder cover 6. The motor-side rotating shaft 13 is made of a magnetic material, and the encoder-side rotating shaft 14 is made of a non-magnetic material. The motor-side rotary shaft 13 and the encoder-side rotary shaft 1
4 may be integrally formed of the same material.

The motor unit 2 includes a rotor 22 in which a magnet 21 is fixed to the outer peripheral surface of the motor-side rotating shaft 13, and a tubular stator 23 that surrounds the outer peripheral side of the rotor 22. The stator 23 includes a stator core 24 made of laminated cores and a coil 26 wound around each of a plurality of salient poles 241 provided on the stator core 24 via an insulator 25. The stator core 24 is fixed to the inside of the core holder 51 by shrink fitting or press fitting. A wiring board 8 to which the winding of the coil 26 is connected and a cover member 9 covering the wiring board 8 are arranged on the counter-output side L2 of the stator 23. A lead wire 27 for feeding power, which is routed from a lead wire take-out portion 56 formed on the side surface of the motor case 5 to the inside of the motor case 5, is connected to the wiring board 8.

The encoder 4 is a magnetic encoder, and is magnetically sensitive to an encoder magnet 42 fixed to the tip of a rotary shaft 14 on the encoder side via a magnet holder 41 and an MR element or the like facing the encoder magnet 42 on the opposite output side L2. The element 43 is provided. The encoder magnet 42 has one north pole and one south pole magnetized on the magnetizing surface facing the magnetizing element 43. The sensor substrate 44 on which the magnetic sensing element 43 is mounted is fixed to the bottom 54 of the brake case 53 via the substrate holder 45. A cup-shaped sensor cover 46 is fixed inside the encoder cover 6. The outer peripheral side and the non-output side L2 of the sensor board 44 are covered with the sensor cover 46.

In the encoder 4, the encoder magnet 42 rotates with the rotation of the encoder-side rotating shaft 14 that rotates integrally with the motor-side rotating shaft 13, and the magnetic sensing element 43 detects a change in the magnetic field due to the rotation of the encoder magnet 42. The detection result by the magnetic sensing element 43 is output to the outside via the sensor wire 47 connected to the sensor substrate 44. The sensor wire 47 is pulled out from the sensor wire extraction unit 63 formed on the encoder cover 6.

The solenoid brake 3 has an annular friction plate 31 that rotates integrally with the motor-side rotating shaft 13, an annular armature 32 that faces the friction plate 31 on the counter-output side L2, and an annular friction plate 31 that faces the friction plate 31 on the output side L1. An annular plate 33 is provided, and a cylindrical solenoid 34 arranged on the counter-output side L2 of the armature 32 is provided. The solenoid 34 is fixed to the brake case 53 by bolts. The lead wire 35 for supplying power to the solenoid 34 is pulled out from the lead wire take-out unit 56 to the outside of the motor case 5 together with the lead wire 27 connected to the motor unit 2.

The electromagnetic brake 3 includes a torque spring (not shown) that urges the armature 32 toward the friction plate 31. In the electromagnetic brake 3 when the solenoid 34 is not energized (when not energized), the friction plate 31 is sandwiched between the armature 32 and the plate 33 by the torque spring, so that the friction force causes the electromagnetic brake 3 to move to the motor side rotating shaft 13. A rotational load is applied and braking force is generated. Further, when the solenoid 34 is energized (excited), the armature 32 is attracted to the solenoid 34 against the torque spring, so that a gap is generated between the armature 32 and the friction plate 31. Therefore, since the rotational load due to friction is not applied to the motor-side rotating shaft 13, the braking force does not act.

(Wiring structure and insulation structure of the motor)
FIG. 2 is an exploded perspective view of the motor unit 2. Further, FIG. 3 is a plan view of the rotor 22 and the stator 23 as viewed from the counter-output side L2. The stator 23 includes 12 salient poles 241 (see FIG. 1), and the number of slots N in which the coil 26 is arranged is 12. Further, the magnet 21 of the rotor 22 is an 8-pole magnetizing magnet in which the outer peripheral surface is divided into 8 poles and the N pole and the S pole are alternately magnetized in the circumferential direction. That is, the motor unit 2 of this embodiment has 8 poles and 12 slots. The number of slots N of the stator 23 and the number of magnetic poles M of the magnet 21 may be other than 8 poles and 12 slots. That is, the condition that the number of slots of the stator 23 is N = 3n and the number of magnetic poles of the magnet M = 2n or 4n may be satisfied (n is an integer of 1 or more). For example, it may be 6 poles and 9 slots or 4 poles and 6 slots.

Collars are formed at both ends of the insulator 25 attached to each salient pole 241 of the stator core 24 in the radial direction. As shown in FIG. 2, the flange portion arranged on the outer side in the radial direction of the coil 26 includes the anti-output side flange portion 251 covering the end surface of the anti-output side L2 of the stator core 24 and the end surface of the output side L1 of the stator core 24. The output side flange portion 252 for covering is provided. In this embodiment, since the number of salient poles 241 and insulators 25 around which the coil 26 is wound is 12, 12 counter-output side flanges 251 are arranged in an annular shape. Further, terminal pins 28 are press-fitted into each insulator 25 at two locations along the inner peripheral surface of the non-output side flange portion 251. The winding terminal of the coil 26 is connected to a terminal pin 28 protruding from the insulator 25 around which the coil 26 is wound. For example, the end of the winding is entwined with the terminal pin 28.

The motor unit 2 is an AC servomotor, and the stator 23 includes a three-phase coil 26. As shown in FIG. 3, four of the twelve coils 26 are U-phase coils 26U, four of the remaining eight are V-phase coils 26V, and the remaining four are W-phase coils. It is 26W. The U-phase coil 26U, the V-phase coil 26V, and the W-phase coil 26W are arranged in this order in the circumferential direction. Therefore, the terminal pin 28U connected to the U-phase coil 26U, the terminal pin 28V connected to the V-phase coil 26V, and the terminal pin 28W connected to the W-phase coil 26W are two in this order in the circumferential direction. Be arranged. The sequence order of the U phase, the V phase, and the W phase is not limited to such an order, and may be another sequence order.

As shown in FIG. 2, the wiring board 8 includes an annular wiring pattern forming portion 81 and an arm portion 82 projecting radially outward from the outer peripheral edge of the wiring pattern forming portion 81. The arm portion 82 includes a constricted portion 821 connected to the wiring pattern forming portion 81, and a wide portion 822 provided at the tip of the arm portion 82 and wider in the circumferential direction than the constricted portion 821. Further, the wiring board 8 includes a plurality of through holes 83 arranged in an annular shape on the outer peripheral edge of the wiring pattern forming portion 81. The wiring board 8 is fixed to the stator 23 by inserting the terminal pins 28 protruding from the insulator 25 into the through holes 83 and soldering them. An insulating adhesive is applied to the through hole 83 into which the terminal pin 28 is inserted. As a result, the terminal pin 28 is fixed to the through hole 83. The wiring board 8 is positioned in the axial direction L by abutting the edge portion on the outer peripheral side of the through hole 83 with the counter-output side flange portion 251 of the insulator 25.

FIG. 4 is a plan view of the wiring board 8 as viewed from the counter-output side L2. Three lead wires 27 are fixed to the wiring board 8. The core wire is exposed at the tip of the lead wire 27. By soldering the core wire of the lead wire 27 to the three lands 84 formed on the wiring board 8, the lead wire 27 is fixed to the wiring board 8 and the lead wire 27 is electrically connected to the land 84. An insulating adhesive (for example, a silicon-based adhesive) is applied to the portion where the lead wire 27 and the land 84 are fixed. This adhesive is the same as the adhesive in which the terminal pin 28 is fixed to the through hole 83. Therefore, the wiring board 8 is formed with an insulating adhesive layer 29 that covers the tip of the lead wire 27 and the land 84 (see FIG. 1). In FIG. 4, the adhesive layer 29 is not shown.

As shown in FIG. 4, the three lead wires 27 are routed from the land 84 toward the arm portion 82 and fixed to the constricted portion 821 by the fixing member 58. As the fixing member 58, a binding band, a heat-shrinkable tube, an elastic rubber tube, or the like is used. The wide portion 822 provided at the tip of the arm portion 82 has a shape that prevents the fixing member 58 from coming off. As shown in FIG. 1, the arm portion 82 is arranged in the lead wire take-out portion 56 provided in the motor case 5. The lead wire take-out portion 56 includes a notch 561 (see FIGS. 1 and 2) in which the edge of the non-output side L2 of the core holder 51 is cut out on the output side L1 and an outer peripheral surface of the core holder 51 so as to cover the notch 561. It is provided with a lead wire holder 562 fixed to. The arm 82 of the wiring board 8 projects through the notch 561 into the space between the core holder 51 and the lead wire holder 562.

The lead wire holder 562 is attached so as to straddle the joint portion between the core holder 51 and the brake case 53. The lead wire 27 fixed to the arm portion 82 is bent to the counter-output side L2 at the tip of the arm portion 82, and together with the lead wire 35 for supplying power to the electromagnetic brake 3, the brake case 53 and the lead wire holder 562 It is taken out from the gap to the outside of the motor case 5. On the non-output side L2 of the lead wire holder 562, a lead wire fixing portion for fixing the lead wires 27 and 35 taken out of the motor case 5 and routed in the axial direction L to the outer surface of the motor case 5 is provided. Has been done. The lead wire fixing portion has a structure in which the lead wires 27 and 35 are fixed by a pressing member 57 screwed to the outer surface of the brake case 53.

(Cover member)
As shown in FIGS. 1 and 2, an annular cover member 9 is assembled to the counter-output side L2 of the wiring board 8. The cover member 9 rises from the annular plate-shaped portion 91 that covers the substrate surface of the wiring board 8 from the counter-output side L2 (that is, the side opposite to the stator 23) and the outer peripheral edge of the plate-shaped portion 91 to the output side L1. A cylindrical outer peripheral portion 92 and a cylindrical inner peripheral portion 93 rising from the inner peripheral edge of the plate-shaped portion 91 to the output side L1 are provided. As shown in FIG. 2, a notch 95 for passing the lead wire 27 is formed in the outer peripheral portion 92. The notch 95 has a shape in which a part of the outer peripheral portion 92 in the circumferential direction is cut out. The cover member 9 is attached with the notch 95 aligned with the angular position of the lead wire take-out portion 56.

FIG. 5A is a perspective view of the cover member 9, and FIG. 5B is a plan view of the cover member 9. As shown in FIG. 5A, the cover member 9 is formed with three rib-shaped convex portions 94 protruding from the plate-shaped portion 91 to the output side L1 (that is, the stator 23 side). The three convex portions 94 have an arcuate shape having the same diameter, and are arranged in an angle range excluding the angle range in which the notch 95 is formed. As shown in FIG. 1, in the cover member 9, the tip surface of the convex portion 94 faces the wiring board 8 in the axial direction L. Therefore, the convex portion 94 regulates the position of the cover member 9 in the axial direction L with respect to the wiring board 8, and secures the distance between the wiring board 8 and the plate-shaped portion 91 of the cover member 9.

As shown in FIG. 1, the cover member 9 is arranged between the wiring board 8 and the electromagnetic brake 3, and can move in the axial direction L between the wiring board 8 and the electromagnetic brake 3. The outer peripheral portion 92 of the cover member 9 extends from the wiring board 8 to the position of the output side L1 (that is, the stator core 24 side). Regarding the dimension of the outer peripheral portion 92 in the axial direction L, even if the cover member 9 moves to the position closest to the electromagnetic brake 3 between the wiring board 8 and the electromagnetic brake 3, the tip portion of the outer peripheral portion 92 is from the wiring board 8. Is also dimensioned to be located on the stator core 24 side. Further, the inner peripheral portion 93 of the cover member 9 has a shorter axial direction L than the outer peripheral portion 92, but extends to a position where it covers the inner peripheral side end surface of the wiring board 8.

The outer peripheral portion 92 of the cover member 9 is arranged between the outer peripheral side end surface of the wiring board 8 and the core holder 51, and covers the outer peripheral side end surface of the wiring board 8 from the outer peripheral side. Further, the inner peripheral portion 93 of the cover member 9 is arranged between the inner peripheral side end surface of the wiring board 8 and the motor side rotating shaft 13, and covers the inner peripheral side end surface of the wiring board 8 from the inner peripheral side. Therefore, the outer peripheral portion 92 insulates the outer peripheral side end surface of the wiring board 8 from the core holder 51, and the inner peripheral portion 93 insulates the inner peripheral side end surface of the wiring board 8 from the motor side rotating shaft 13. Further, the plate-shaped portion 91 of the cover member 9 is arranged between the plate 33 of the electromagnetic brake 3 and the substrate surface of the wiring board 8. Therefore, the plate-shaped portion 91 insulates the substrate surface of the wiring board 8 and the lead wire 27 fixed to the substrate surface from the plate 33.

(Wiring board)
The wiring board 8 is a four-layer board in which four wiring layers are laminated via an insulating layer, and is a U-phase wiring layer 8U on which a U-phase wiring pattern 85U to which a U-phase coil 26U is connected is formed, and V. It includes a V-phase wiring layer 8V in which a V-phase wiring pattern 85V to which a phase coil 26V is connected is formed, and a W-phase wiring layer 8W in which a W-phase wiring pattern 85W to which a W-phase coil 26W is connected is formed (FIG. 7). -See FIG. 9). The other layer is a surface layer 8A on which the land 84 and the wiring pattern 85A for connection are formed. The surface layer 8A is provided on the substrate surface of the counter-output side L2 of the wiring board 8. The plan view of FIG. 4 is a plan view of the wiring board 8 seen from the side of the surface layer 8A, and shows the wiring pattern of the surface layer 8A.

In the wiring board 8, the wiring pattern of each layer and the coil 26 of each phase are connected via the terminal pin 28 soldered to the through hole 83 penetrating the four layers. The wiring patterns of each layer (U-phase wiring pattern 85U, V-phase wiring pattern 85V, W-phase wiring pattern 85W, wiring wiring pattern 85A) are configured to delta-connect the three-phase coils 26. FIG. 6 is an explanatory diagram schematically showing a state in which the three-phase coils 26 are delta-connected by the wiring board 8.

FIG. 7 is an explanatory diagram of the U-phase wiring layer 8U and the U-phase coil 26U, FIG. 8 is an explanatory diagram of the V-phase wiring layer and the V-phase coil 26V, and FIG. 9 is an explanatory diagram of the W-phase wiring layer and the W-phase coil 26W. It is explanatory drawing. In FIGS. 4 and 7 to 9, the shaded portion is the wiring pattern of each phase. The U-phase wiring pattern 85U, the V-phase wiring pattern 85V, and the W-phase wiring pattern 85W have an annular region 86 provided on the inner peripheral side of the wiring substrate 8 and a radial region from the annular region 86 toward the outer peripheral edge of the substrate, respectively. A protruding region 87 is provided. The protruding region 87 is formed so as to have a position and a number according to the number and arrangement of the coils 26 of each phase. The motor unit 2 of this embodiment has 8 poles and 12 slots, and the three-phase coils 26 are arranged in the circumferential direction in the order of U, V, and W described above. Therefore, the protruding regions 87 are provided at four locations at equal angular intervals in the circumferential direction. That is, the protruding regions 87 are provided at four locations at an angular interval of 90 °. The width of the protruding region 87 in the circumferential direction is a width including two adjacent through holes 83. Four through holes 83 are provided between the projecting regions 87 adjacent to each other in the circumferential direction.

The U-phase wiring pattern 85U, the V-phase wiring pattern 85V, and the W-phase wiring pattern 85W have the same shape except that the angular positions of the protruding regions 87 are displaced as shown in FIGS. 7 to 9. The angular position of the protruding region 87 in the wiring pattern of each phase is an angular position corresponding to the angular position where the coil 26 of each phase is arranged. As shown in FIG. 3, in this embodiment, the coils 26 are arranged in the order of U, V, and W clockwise when viewed from the counter-output side L2. Therefore, the angular position of the protruding region 87 is an angular position shifted clockwise by 15 ° in the order of U, V, and W when viewed from the counter-output side L2.

In this embodiment, the number of U-phase coils 26U is 4, but these U-phase coils 26U are connected in parallel by the U-phase wiring pattern 85U and the W-phase wiring pattern 85W. That is, in each of the U-phase coils 26U, one of the two terminal pins 28U in which the winding end of the U-phase coil 26U is entwined is provided in the protruding region 87 of the U-phase wiring pattern 85U. It is fixed in the hole 83. On the other hand, the other terminal pin 28U is fixed to the through hole 83 located outside the protruding region 87 of the U-phase wiring pattern 85U. For example, as shown in FIG. 7, the other terminal pin 28U is fixed to the through hole 83 at a position overlapping the protruding region 87 of the W-phase wiring pattern 85W. As a result, the U-phase coil 26U is connected in parallel between the U-phase wiring pattern 85U and the W-phase wiring pattern 85W. Similarly, the four W-phase coils 26W are connected in parallel by the W-phase wiring pattern 85W and the V-phase wiring pattern 85V. Further, the four V-phase coils 26V are connected in parallel by the V-phase wiring pattern 85V and the U-phase wiring pattern 85U.

As shown in FIG. 4, the wiring wiring pattern 85A formed on the surface layer 8A is a pattern in which fan-shaped wiring regions 88 including two through holes 83 adjacent to each other in the circumferential direction are arranged in the circumferential direction. Two terminal pins 28 to which coils 26 of different phases are connected are fixed to the two through holes 83 provided in the same connection region 88. Since the connection regions 88 are not connected to each other, the three-phase coils 26 are delta-connected via the connection wiring pattern 85A. The three lands 84 for fixing the lead wire 27 are provided at one each in the three connection regions 88 which are continuously arranged in the circumferential direction. In this embodiment, the lands 84 are provided in the three connection regions 88 (shaded portions) closest to the arm 82 of the wiring board 8. Since the connection region 88 extends from the vicinity of the outer peripheral edge to the vicinity of the inner peripheral edge of the wiring board 8, a wide formation region of the land 84 can be secured.

(Comparison of pattern width with conventional example)
The wiring board of the conventional example shown in FIG. 10 is used for a motor having 8 poles and 12 slots as in the above embodiment, and the coils of the motor are connected in a Y shape. The wiring pattern for Y-shaped connection shown in FIGS. 10 (a) to 10 (d) has a narrower pattern width than the wiring pattern for delta connection shown in FIGS. 4 and 7 to 9. That is, the wiring pattern for delta wiring provided on the wiring board 8 of the present embodiment has a pattern width including two through holes adjacent to each other in the circumferential direction, whereas FIGS. 10 (a) to 10 (d) show. The wiring pattern for Y-shaped connection shown in FIG. 2 includes a portion having a pattern width including only one through hole. That is, when the coil 26 is connected by the wiring pattern for delta wiring as in this embodiment, the pattern width can be made wider than that using the wiring pattern for Y-type wiring.

(Main effect of this form)
As described above, the motor 1 of the present embodiment is configured to delta-connect the three-phase coils 26 via the wiring pattern formed on the wiring board 8. When the number of slots N is 3 × n and the number of poles M of the magnet 21 is 2 × n or 4 × n as in this embodiment, when the wiring pattern of the wiring board 8 is formed so as to delta-connect the coil 26, The pattern width can be made wider than when the wiring pattern is formed so as to make a Y-shaped connection. Therefore, there is little possibility that the wiring pattern will be burnt out when a large current flows. Therefore, it is possible to prevent the wiring pattern from burning when a large current is passed through the motor 1 at a low voltage.

The wiring board 8 of this embodiment includes an annular wiring pattern forming portion 81, and the wiring pattern forming portion 81 includes a wiring pattern (U-phase wiring pattern 85U, V-phase wiring pattern 85V, W-phase wiring pattern 85W) and a land 84. Is provided. In this way, when the lead wire 27 is pulled into the annular wiring pattern forming portion 81 and soldered to the land 84, it is not necessary to narrow the pattern width of the portion connecting the land 84 and the wiring pattern. For example, when a land is provided at the tip of the arm portion 82, it is necessary to form a wiring pattern for each phase along the constricted portion 821, and as a result, it is necessary to form a thin wiring pattern. There is no need to use patterns. In particular, in this embodiment, since the land 84 is formed in the fan-shaped connection region 88, it is not necessary to provide a narrow wiring pattern. Therefore, there is little possibility that the wiring pattern will be burnt out when a large current flows.

In the present embodiment, the wiring board 8 includes an arm portion 82 projecting from the wiring pattern forming portion 81 to the outer peripheral side, and the lead wire 27 is fixed to the arm portion 82. In this way, even if the lead wire 27 pulled out to the outside of the motor case 5 is pulled, it is difficult for the force to be transmitted to the portion where the land 84 and the lead wire 27 are fixed by soldering. Therefore, there is little possibility that the lead wire 27 will come off from the wiring board 8.

In the present embodiment, the arm portion 82 includes a constricted portion 821 that connects the arm portion 82 to the wiring pattern forming portion 81, and a wide portion 822 that is wider in the circumferential direction than the constricted portion 821 is formed at the tip of the arm portion 82. There is. Therefore, when the lead wire 27 is fixed to the constricted portion 821 by the fixing member 58, there is little possibility that the fixing member 58 will come off from the arm portion 82. Therefore, there is little possibility that the lead wire 27 will be unfixed to the arm portion 82. The arm 82 of the wiring board 8 may have the same width in the circumferential direction. In this case, if a binding band is used as the fixing member 58, a hole is made in the arm portion 82, the binding band is passed through the arm portion 82, and the lead wire 27 is fixed, the fixing member 58 can be prevented from coming off.

In this embodiment, the lead wire 27 is pulled out to the outside of the motor case 5 and then fixed to the outer surface of the motor case 5 (the outer surface of the brake case 53) by the pressing member 57. That is, the lead wire 27 is fixed at two points by the fixing member 58 and the pressing member 57. Therefore, when the lead wire 27 is pulled, it is difficult for the force to be transmitted to the fixed portion between the land 84 and the lead wire 27. Further, when the lead wire 27 is fixed to the outer surface of the motor case 5, the lead wire lead-out direction can be changed at the fixed portion. For example, even if the pull-out direction is changed in the direction intersecting the axial direction L, it is possible to prevent or suppress the application of force to the fixed portion (soldered portion) between the land 84 and the lead wire 27.

In this embodiment, an adhesive is applied to a fixed portion where the lead wire 27 is fixed to the land 84, and an adhesive layer 29 covering the lead wire 27 and the land 84 is formed. By strengthening the fixing with the adhesive layer 29 in this way, there is little possibility that the lead wire 27 will come off from the fixed portion where the lead wire 27 is fixed to the land 84. Further, since the adhesive layer 29 is made of an insulating adhesive such as silicon, the fixing portion between the land 84 and the lead wire 27 can be insulated from other members. Therefore, it is possible to prevent a short circuit between the lead wires 27 and a short circuit between the lead wire 27 and another member.

In this embodiment, all 12 coils wound around the salient pole 241 of the stator core 24 are wound in the same direction. Therefore, the stator 23 can be easily manufactured.

1 ... motor, 2 ... motor unit, 3 ... electromagnetic brake, 4 ... encoder, 5 ... motor case, 6 ... encoder cover, 7 ... sealing material, 8 ... wiring board, 8A ... surface layer, 8U ... U phase wiring layer, 8V ... V-phase wiring layer, 8W ... W-phase wiring layer, 9 ... Cover member, 10 ... Rotating shaft, 11 ... Output side bearing, 12 ... Non-output side bearing, 13 ... Motor side rotating shaft, 14 ... Encoder side rotating shaft , 21 ... magnet, 22 ... rotor, 23 ... stator, 24 ... stator core, 25 ... insulator, 26 ... coil, 26U ... U-phase coil, 26V ... V-phase coil, 26W ... W-phase coil, 27 ... lead wire, 28, 28U, 28V, 28W ... terminal pin, 29 ... adhesive layer, 31 ... friction plate, 32 ... armature, 33 ... plate, 34 ... solenoid, 35 ... lead wire, 41 ... magnet holder, 42 ... encoder magnet, 43 ... feeling Magnetic element, 44 ... Sensor board, 45 ... Board holder, 46 ... Sensor cover, 47 ... Sensor wire, 51 ... Core holder, 52 ... Bearing holder, 53 ... Brake case, 54 ... Bottom, 55 ... Cylindrical part, 56 ... Lead Wire take-out part, 57 ... Holding member, 58 ... Fixing member, 61 ... Bottom, 62 ... Side wall part, 63 ... Sensor wire take-out part, 81 ... Wiring pattern forming part, 82 ... Arm part, 83 ... Through hole, 84 ... Land , 85A ... Wiring pattern for connection, 85U ... U-phase wiring pattern, 85V ... V-phase wiring pattern, 85W ... W-phase wiring pattern, 86 ... Circular region, 87 ... Protruding region, 88 ... Connection region, 91 ... Plate-shaped portion, 92 ... Outer circumference, 93 ... Inner circumference, 94 ... Convex, 95 ... Notch, 100 ... Output shaft, 185A ... Wiring pattern, 185U ... U-phase wiring pattern, 185V ... V-phase wiring pattern, 185W ... W-phase wiring Pattern, 241 ... salient pole, 251 ... anti-output side flange, 252 ... output side flange, 521 ... annular rib, 551 ... small diameter, 561 ... notch, 562 ... lead wire holder, 821 ... constriction, 822 ... Wide part, L ... Axial direction, L1 ... Output side, L2 ... Non-output side

Claims (8)

A rotor including a magnet, a stator core arranged on the outer peripheral side of the rotor, a three-phase coil wound around the stator core, a wiring board to which windings and lead wires of the coil are connected, and the stator core. Has a motor case to accommodate,
The number of slots N of the stator core and the number of poles M of the magnet satisfy the following conditions: N = 3 × n and M = 2 × n or 4 × n (n is an integer of 1 or more).
The wiring board includes four wiring layers laminated with an insulating layer interposed therebetween.
Wiring patterns are formed in each of the three wiring layers to which coils of the same phase are connected.
The other one layer is a surface layer provided on the surface of the wiring board, and the land and the land to which the lead wire is electrically connected and the wiring pattern of the three layers are connected to the surface layer. A wiring pattern is formed,
A motor characterized in that the three-phase coils are delta-connected by the wiring pattern formed in the three layers and the wiring pattern formed in the surface layer. The wiring board includes an annular wiring pattern forming portion.
The motor according to claim 1, wherein the wiring pattern and the land are provided in the wiring pattern forming portion. Each of the three layers has an annular region provided on the inner peripheral side of the wiring pattern forming portion and a wiring pattern provided with a protruding region protruding from the annular region to the outer peripheral side, and the protruding region has a protruding region. Equipped with two through holes adjacent to each other in the circumferential direction
The motor according to claim 2, wherein the surface layer includes a wiring pattern for connection in which a plurality of connection regions having two through holes adjacent to each other in the circumferential direction are arranged in the circumferential direction. The wiring board includes an arm portion that protrudes to the outer peripheral side from the wiring pattern forming portion.
The lead wire is fixed to the arm and
The motor according to claim 2 or 3, wherein the arm portion includes a constricted portion connected to the wiring pattern forming portion and a wide portion having a width wider in the circumferential direction than the constricted portion. The motor according to any one of claims 1 to 4, wherein a portion of the lead wire drawn out to the outside of the motor case is fixed to the outer surface of the motor case. The motor according to any one of claims 1 to 5, further comprising an adhesive layer covering the land and a portion of the lead wire fixed to the land. The motor according to claim 6, wherein the adhesive layer is made of an insulating adhesive. The motor according to any one of claims 1 to 7, wherein all the coils wound around the stator core have the same winding direction of the windings.

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