JP2000041371A - Brushless motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of man-hours and a number of parts used in assembling a brushless motor by simplifying the structure of mounting a printed wiring board mounted with rotational position detecting elements for detecting the rotational position of its rotor. SOLUTION: This entire motor, excepting the inner and outer circumferential surfaces of a stator core 15 on which stator winding 16 is wound, is provided with an insulator 17 formed of synthetic resin, superior in heat resistance and insulation, to insulate the stator core 15. This motor has a printed wiring board 32 provided with a plurality of rotational position detecting elements Hu, Hv, Hw for detecting the rotational positions of permanent magnets placed on the circumference of the rotor 21, and installed on the insulator 17 formed on the stator core 15 in proximity to the coil end portion of the stator winding 16 wound on the stator core 15, in such a manner that the printed wiring board 32 is installed freely detachably.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a brushless motor provided with a rotational position detecting element such as a Hall IC suitable for a fan motor used in an air conditioner. The printed circuit board quickly and efficiently using the narrow dead space.
The reason is that it can be securely attached.

[0002]

2. Description of the Related Art Conventionally, brushless motors are, for example,
As shown in FIG. 15, a rotor 4 having a permanent magnet 1 on the outer periphery and rotatably supported on a pair of cases 2 and 2a via a rotor shaft 4a and bearings 3 and 3a, and a stator winding 5 and a rotor core 6 rotatably inserted through the rotor 4 and fitted and attached to the pair of cases 2 and 2a.
And a rotational position detecting element 7 such as a Hall IC for detecting the magnetic pole position of the rotor 4.

The brushless motor A shown in FIG. 15 has, for example, a three-phase power supply lead wire for energizing the stator winding 5 of each phase (U, V, W phases), And a lead wire for supplying an exciting current to the rotational position detecting element 7 is connected to a drive circuit (not shown), and when an exciting current is supplied from the drive circuit to the rotational position detecting element 7,
The required rotational position detecting element 7 generates a Hall voltage,
By exciting a coil of a predetermined phase of the stator winding 5 (energizing an exciting current from a drive circuit to the coil of the predetermined phase) and controlling commutation, the rotor 4 is rotated by a rotating magnetic force generated from the stator core 6. It is configured to rotate.

[0004]

The rotor 4
Position detection element 7 for detecting the magnetic pole position (rotation position)
Was generally mounted as shown in FIG. That is, in FIG. 15, a plurality of support pins (made of synthetic resin) 8 for supporting a substrate are inserted into holes bored on one side of the bottom plate of the case 2a while projecting into the case 2a. 8 is fixed to the periphery of the mounting hole through a mounting hole of the printed wiring board 9 on which the rotational position detecting element 7 is mounted, so that the printed wiring board 9 is supported by the support pins 8. Further, on the printed wiring board 9, a mounting body 10 made of, for example, a resin plate is vertically protruded so as to face the lower part of the periphery of the permanent magnet 1 provided on the outer periphery of the rotor 4, At the top of the mounting body 10, the rotational position detecting elements 7 are arranged in parallel for three phases so as to face the permanent magnet 1 of the rotor 4.

However, when the rotational position detecting element 7 is mounted, the mounting body 10 on which the rotational position detecting element 7 is mounted is mounted.
And the printed wiring board 9 on which the mounting body 10 is protruded,
Due to the fact that the brushless motor A is attached to a position on an extension of the rotor 4 in the axial direction, the brushless motor A has a problem that its axial dimension is inevitably longer and the overall shape of the motor becomes larger. .

When mounting the printed wiring board 9, a plurality of support pins 8 are inserted using holes drilled in the bottom plate of the case 2a, and printed inside the case 2a using the support pins 8. Since the printed circuit board 9 is mounted on the narrow place of the case 2a because the printed circuit board 9 is supported, the mounting work takes time and effort.
Since a hole is provided in the case 2a or the support pin 8 is specially required, the number of working steps and the number of parts are increased, and the manufacturing cost of the brushless motor is inevitably increased.

Further, since the rotational position detecting element 7 is mounted in a state in which it is previously assembled in the case 2a, when the stator core 6 is fitted into the case 2a by means of press-fitting or the like, this fixing is performed. If the stator core 6 is not pressed into the case 2a at the set predetermined insertion position, the stator core 6 of the insulator 11 where the stator core 6 is insulated with the mold resin except for the outer peripheral surface thereof is fixed to the stator core 6 side. The rotation position detecting element 7 is provided between the projecting pieces 12 projecting to prevent the winding 5 from jumping out.
However, there is a problem that the rotation position detection element 7 is damaged due to direct contact with the protruding end of the protruding piece 12 or the installation position is shifted, so that the rotation position of the rotor 4 cannot be accurately detected. .

In view of the various problems described above, the present invention provides a printed wiring board having a plurality of rotational position detecting elements for detecting the rotational position of a rotor mounted on an insulating insulator formed on a stator core. It is an object of the present invention to provide a brushless motor which is close to a stator winding and has a rotational position detecting element opposed to a rotor, and can be detachably mounted in a state close to one operation.

[0009]

According to a first aspect of the present invention, a stator core on which a stator winding is wound is fixed to a whole region except for the inner and outer peripheral surfaces thereof by a synthetic resin having excellent heat resistance and insulation properties. In a motor provided with an insulator for insulating a core, a printed circuit board provided with a plurality of rotational position detecting elements for detecting a rotational position of a permanent magnet provided on an outer periphery of a rotor is provided on an insulator formed on the stator core. The stator winding is wound around the stator core, and is engaged with the coil end portion so as to be detachably engageable and mounted.

According to a second aspect of the present invention, there is provided a first support wall for mounting a lower portion of an outer peripheral edge of a printed wiring board on an outer peripheral side of a stator iron core on an insulator of a stator core, and an outer peripheral edge of the printed wiring board. A locking claw having an engagement groove for releasably engaging the printed wiring board; and a locking groove for fitting and locking the outer peripheral edges of both ends in the longitudinal direction of the printed wiring board. A second support wall formed inside the first support wall and formed at right angles to the end surface in the vertical direction.

According to the third aspect of the present invention, the insulator of the stator core has an engagement groove provided on the outer peripheral side of the stator core so as to be detachably engaged with the outer peripheral side of the printed wiring board. A plurality of claws are protruded, and on the inner peripheral side of the stator core, projecting through a mounting hole provided on the inner peripheral edge side of the printed wiring board, a supporting pin for fusing and fixing the top to the printed wiring board is projected. It is characterized by being provided and formed.

In the invention according to claim 4, the printed wiring board is formed in an arc shape along an insulator of a stator core, and an outer peripheral edge thereof is mounted on a first support wall provided on the insulator, and The engaging claw protruding between the first support walls is engaged with the engaging claw protruding from the outer peripheral edge to engage with the engaging groove provided on the second supporting wall of the insulator. Thus, it is characterized in that it is detachably mounted close to the coil end of the stator winding.

5. The printed wiring board according to claim 5, wherein the printed wiring board is formed in an arc shape along an insulator of a stator core, and an outer peripheral side thereof is locked by a locking claw formed on the insulator. On the inner peripheral side of the wiring board, a supporting pin protruding from the insulator on the inner peripheral side of the stator core is detachably supported by penetrating or fixed through, and mounted close to the coil end of the stator winding. It is characterized by doing so.

According to a sixth aspect of the present invention, there is provided a lead wire which is connected to a lead wire of a stator winding and supplies power to the stator winding, and a lead wire which supplies power to a rotational position detecting element drawn from a printed wiring board. Through the pair of first and second guide walls formed at positions on the extension of the first and second support walls on the outer peripheral side of the stator core, and are guided in directions opposite to each other. At the opposite end of each guide wall from which each lead wire is derived, a locking block for bending each lead wire at a substantially right angle and individually pulling out and guiding it while being locked to the insulator is formed. It is characterized by having done.

The present invention utilizes a synthetic resin insulator formed on a stator core as described above, and provides a printed wiring board having a plurality of rotational position detecting elements formed in an arc along the insulator. The brushless motor detects the rotational position of the rotor in a brushless motor because it is configured to be attached to the engaging claw formed on the insulator or the engaging groove provided on the peripheral wall in almost one operation and close to the stator winding. The printed wiring board having the elements can be easily, quickly and reliably mounted by effectively utilizing the narrow space in the motor.

Moreover, the lead wire connected to the stator winding and the lead wire connected to the terminal block of the printed wiring board pass between a pair of guide walls formed on the outer peripheral side of the stator core of the insulator, respectively. The lead wire is locked (prevented) even if the printed wiring board is simply engaged and held by the insulator, because it is configured to be pulled out by being locked by the locking block provided at the end of the guide wall. By doing so, there is no possibility that the printed wire board is disengaged due to the tensile force acting on the lead wire itself, or the lead wire does not detach from the terminal block at all, supporting the lead wire securely and securely be able to.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 7, reference numeral 15 denotes a stator core of a brushless motor. As shown in FIG. 3, the stator core 15 is generally formed by pressing an electromagnetic steel sheet such as a silicon steel strip into a plurality of slots 15a and teeth. It is formed by laminating and fixing a predetermined number of iron core plates integrally formed with 15b. In FIG. 4, reference numeral 16 denotes an insulator (resin) formed by performing injection molding of, for example, a heat-resistant insulating resin on the upper and lower end surfaces of the stator core 15 including the slots 15a and the teeth 15b except for the outer peripheral surface. Insulating layer)
17 is a stator winding wound around the tooth portion 15b via the same.

When the insulator 17 is formed, the stator core 15 is housed in a mold (not shown), and a synthetic resin (for example, polybutylene terephthalate or the like) having excellent heat resistance and insulation properties is inserted from the injection gate of the mold. ) Is injected, and the inner surface of the stator core 15 except the inner and outer peripheral surfaces and the upper and lower end surfaces are subjected to resin molding to form an insulator 17 having a predetermined thickness.

Next, in FIG. 7, reference numerals 18 and 18a denote cases for holding and fixing the stator core 15, which are formed by press-forming a metal plate such as a steel plate.
Bearing support housings 20 and 20a for fitting the bearings 9 and 19a are integrally formed. Reference numeral 21 denotes a rotor, and a rotor shaft 2
2, the bearings 19, 19a are fitted to the cases 18, 1
8a into the bearing support housings 20 and 20a,
The rotor 21 is inserted into the rotor insertion hole 23 of the stator core 15 and rotatably supported.

Subsequently, in FIGS.
Reference numerals b and 24c denote first support walls formed to have a slightly smaller diameter than the outer diameter of the stator core 15 and protrude upward by a predetermined length toward the insulator 17 on the outer peripheral side of the upper end face of the stator core 15. In the present embodiment, the support walls 24a to 24c are formed integrally with the insulator 17 on the periphery of the insulator 17 in a state of being divided into three parts on the outer periphery of the stator core 15, as shown in FIG. And
Of the first support walls 24a to 24c, the support wall 24a
Plays a role of mounting a printed wiring board to be described later, and the support walls 24b and 24c are formed so as to serve as a lead guide of a lead wire (lead wire).

In the middle of the first support wall 24a,
As shown in FIGS. 1 and 5, a locking claw 25 having an engaging groove 25a recessed at a position parallel to the height position of the support wall 24a is formed integrally with the insulator 17 and protrudes upward.
Further, in FIG. 3, reference numerals 26a, 26b, and 26c denote support walls 2 at predetermined intervals inside the first support wall 24b.
A cylindrical insulating tube integrally formed with the stator core 4b. On the upper surface thereof, notches a cut out in a U-shape toward the center of the stator core 15 are formed.

Next, inside the both ends of the first support wall 24a, it is located inside the first support wall 24a and upward at a position parallel to the deepest portion of the slot 15a of the stator core 15. The second support walls 27a and 27b are formed integrally with the insulator 17 so as to face each other.
As shown in FIG. 1, engagement grooves 28, which lock the printed wiring board 32,
28a is recessed. The second support wall 27a having the engagement groove 28 is used as it is for the insulator 1
7 and extends in the first support wall 24c side without To integrally a first guide wall 27a ₁ arranged to form a first guide passage b by the first support wall 24c. Also, as shown in FIG. 1, the second support wall 27b is provided with a step at its extending end and is connected to the first support wall 24b, and the portion having no step is the first support wall 24b. The second guide wall 27b ₁ is formed integrally with the insulator 17 on an extension line toward the side (the end side of the support wall 24c located on the first support wall 24c side), and the second guide wall 27b ₁ by the first support wall 24b to form a second guide passage b _1.

In FIG. 1, reference numerals 29 and 29a denote the first and second elements.
The second guide passage b, at a position opposing the b _1, in a locking block which projects at a predetermined interval (interval leads can inserted) onto the insulator 17, the center of these locking blocks 29,29a Are the locking blocks 29, 29a
The support block 30 for partitioning the lock block 29,
Similarly to 29a, it is formed integrally with the insulator 17. Also, on the inner peripheral side of the stator core 15, as shown in FIGS. 1 and 4, the stator winding 16 is prevented from jumping toward the center of the stator core 15 at the position of each tooth 15 b. A protruding wall 31 is formed on the insulator 17 so as to protrude with a certain length in the axial direction of the stator core 15.

As described above, the first and second support walls 24a to 24c, 27 are provided on the outer peripheral side of the stator core 15.
a, 27b and the first and second guide walls 27a ₁ , 27
b ₁ , locking claw 25, locking and supporting blocks 29, 2
9a, 30 are formed on the inner peripheral edge side at the position of each tooth portion 15b by injection molding integrally with the insulator 17 when the insulator 17 is injection molded.

In FIG. 1, reference numeral 32 denotes a printed wiring board on which three rotational position detecting elements Hu, Hv, Hw for detecting the rotational position of the rotor 21 are arranged and mounted at predetermined positions on the lower surface. As shown in FIGS. 1, 2, and 5, the substrate 32 is formed in an arc shape on the outer peripheral edge of the stator core 15 so as to be mounted on the first support wall 24a formed on the insulator 17. At both ends in the longitudinal direction of the printed wiring board 32, locking holes 3 are provided so as to be removably engaged with locking grooves 28, 28a provided in the second support walls 27a, 27b.
3, 33a are recessed. Reference numeral 34 denotes a terminal block mounted on the upper surface of the printed wiring board 32, as shown in FIG.
The rotational position detecting elements Hu, Hv, Hw and the power supply and ground terminal pins d, e, f connected to the rotational position detecting elements Hu, Hv, Hw are respectively provided with required resistors R,
Rotational position detecting element H via electric components such as capacitor C
u, Hv, and Hw.

A case where the printed wiring board 32 is attached to the stator core 15 as shown in FIGS. First, as shown in FIG.
The printed wiring board 32 is placed on the first support wall 24a formed on the insulator 17, and the locking holes 33, 33a at both ends thereof are respectively inserted into the second support wall 27a.
a and 27b are engaged with the engaging grooves 28 and 28a, and are put on the first support wall 24a to be engaged with the locking claws 25.
As shown in FIGS. 2 and 5, the outer peripheral edge is engaged with the engagement groove 25a, so that the printed claw 25 and the second claw 25 are moved on the first support wall 24a in almost one operation. In a state of being engaged with the support walls 27a, 27b, the vehicle can be quickly and reliably mounted and held. That is, as shown in FIG. 7, the printed wiring board 32 can be installed in a horizontal state (a direction perpendicular to the axial direction of the rotor 21) in the vicinity of the coil end of the stator winding 16.

In FIG. 6, the printed wiring board 32
Lead wires 37 (five) for energizing the rotational position detecting elements Hu, Hv, Hw via terminal fittings 36 which can be inserted and connected to the respective terminal pins d, e, f provided on the terminal block 34. Connect. The lead wire 37 connects the terminal fitting 36 to the terminal block 3.
After being connected to the terminal pins d, e, and f of FIG. 4, as shown in FIG.
In the first guide passage b formed by the support wall 24c and the first guide wall 27a ₁ , the locking block 2 is inserted into the guide passage b while being vertically aligned one by one.
Pull out to position 9.

As shown in FIG. 6, the lead wire 37 drawn out to the locking block 29 is drawn out from the first guide passage b corresponding to the locking block 29, and is once turned to the stator winding 16 side. Then, it is inserted into the gap between the locking block 29 and the support block 30 in a state of being bent by about 90 °, and is led out of the insulator 17 to the outside of the stator core 15 in a direction substantially perpendicular to the drawing direction. . As a result, the rotational position detecting elements Hu, Hv, Hw
7 can be pulled out while being bent at about 90 ° with respect to the drawing direction and locked to the locking block 29, so that a force for pulling out the lead wire 37 from the outside of the stator core 15 is reduced. Even if it operates, the lead wire 37 is locked by the locking block 29 and does not come off. Further, when the lead wire 37 attempts to move above the locking block 29, since the top of the support block 30 is formed in a T-shape, the lead wire 37 itself does not come out upward.

Next, the leads U, V, W (see FIG. 4) drawn from each phase of the stator winding 16 are connected to a power source and the stator winding 16.
When the connection is made with the lead wires 38 connecting the lead wires 38, the respective lead wires U, V, W and the lead wires 38 are individually connected,
Each of the connecting portions is inserted into cylindrical insulating tubes 26a to 26c formed integrally with the first support wall 24b, and the lead wires 3 are respectively inserted from the cutouts a of these insulating tubes 26a to 26c.
8 is drawn out toward the center of the stator core 15 as shown in FIG.

[0030] Thereafter, leads to the locking block 29a side second guide passage b ₁ along the first support wall 24b form song, the first support wall 24b and the second guide wall 27b ₁ the formed second guide passage b ₁ on lead 38
Sorting and insert longitudinally, the second outlet of the guide channel b _1, ie When the drawer to the position of the locking block 29a, a lead wire 38 in the same manner as the lead wires 37, such as winding a locking block 29a In this state, it is bent by about 90 ° and inserted into the gap between the locking block 29a and the support block 30,
It is pulled out of the stator 17 from the insulator 17 in a state of being orthogonal to the drawing direction directly from this gap.

As described above, the rotational position detecting elements Hu, H
v, Hw, and the stator winding 16
The lead wires 38 for supplying power to the stator core 15 are drawn out from directions opposite to each other, but the lead wires from the stator core 15 are drawn out using the common support block 30 while being locked to the locking blocks 29 and 29a, respectively. With such a configuration, the lead wires 37 and 38 can be drawn out in a distributed manner, and the space for drawing out the lead wires 37 and 38 is limited to a narrow space at the coil end portion of the stator winding 16. The lead wire 37 can be drawn out by utilizing the _first and second guide passages b, b1 formed separately and the locking blocks 29, 29a also provided separately. , 38 can be pulled out irreversibly against external force, which is convenient.

Next, a second embodiment of the present invention will be described with reference to FIGS. The difference from the first embodiment is that
This is a mounting structure of the printed wiring board 32. That is, in FIG. 8, a pair of locking claws 25b, 25b are provided at predetermined intervals (positions corresponding to the engaging recesses 40 provided on the outer peripheral side of the printed wiring board 32a) on the outer peripheral edge side of the stator core 15.
And is formed integrally with the insulator 17 so as to protrude upward, and on the inner peripheral side of the stator core 15, prevents the stator winding 16 from jumping to the center side of the stator core 15. The locking pin 41 is formed integrally with the insulator 17 at the position of the tooth portion 15b of the stator core 15 and protrudes upward. On the other hand, on the printed wiring board 32a side, a through hole 42 through which the locking pin 41 is inserted is formed at a position corresponding to the locking pin 41.

When mounting the printed wiring board 32a, the printed wiring board 32a is disposed at a board mounting position above the stator core 15, and locking claws 25b, 25b are provided on the outer peripheral edge thereof. The engagement grooves 25b ₁ , 25b
_{At the same time as the first} and the engagement recesses 40 on the printed wiring board 32a are engaged and locked, four locking pins 41 (four) protruding from the inner peripheral edge side of the insulator 17 in the through hole 42 are used. Then, the printed wiring board 32a is placed above the coil end portion of the stator winding 16 via the locking claws 25b, 25b and the locking pin 41 as shown in FIG.
Thereafter, the tops of the two locking pins 41 (two) protruding above the printed wiring board 32a are melted by a heating means (not shown) and welded to the printed wiring board 32a, and the board 32a is removed from the locking pins 41. Prevent escape.

Subsequently, the lead wire 37 drawn from the printed wiring board 32a and the lead wire U of the stator winding 16,
Lead wires 38 connected to V and W (see FIG. 11) and led out
As shown in FIG. 13, since it is configured to be drawn out of the stator core 15 in the same manner as the configuration described in the first embodiment, detailed description thereof is omitted. As shown in FIG. 13, the lead wire 37 drawn out of the printed wiring board 32a is provided on the outer peripheral edge side of the stator core 15 with the first support wall 24c and the first guide wall 27a ₁ formed integrally with the insulator 17. Is pulled out to the locking block 29 through the first guide passage b formed between the locking block 29 and the locking block 29 is wound around and inserted into the gap between the locking block 29 and the support block 30. And pull it out of the stator core 15.

The lead wire 38 connected to the lead wires U, V, W of the stator winding 16 is connected to the first support wall 2 by a connecting portion.
After inserting the insulating tube 26a~26c formed in 4b inward, a second guide path b ₁ formed by only a read line 38 and the first support wall 24b and the second guide wall 27b ₁
Derived, the locking block 2 from the end of the guide channel b ₁
9a, the locking block 29a and the support block 30
Is drawn out of the stator core 15 using a gap between the lead wires 37 and 38, and the lead wires 37 and 38 are locked to the locking blocks 29 and 29a and pulled out. Is the same as in the first embodiment in that it does not come off due to the action.

[0036]

As described above, the present invention utilizes a synthetic resin insulator formed on a stator core and attaches a plurality of rotational position detecting elements formed in an arc along the insulator. Since the wiring substrate is configured to be attached to the engaging claw formed on the insulator or the engaging groove provided on the peripheral wall in almost one operation and close to the stator winding, the rotation position of the rotor in the brushless motor is adjusted. A printed wiring board provided with an element to be detected can be easily, quickly, and reliably mounted by effectively utilizing a narrow space in the motor.

Moreover, since the mounting portion is formed on the printed wiring board by a fitting method using a locking claw or the like, there is no need for a support pin for mounting the board as in the prior art. Since the work can be performed efficiently and the printed wiring board itself is mounted close to the stator core, the axial dimension of the motor can be shortened, and the brushless motor can be reduced in size and weight. ,
And it can be manufactured economically.

The lead wire connecting the stator winding and the lead wire connecting to the terminal block of the printed wiring board pass between a pair of guide walls formed on the outer peripheral side of the stator core of the insulator, respectively. Since the printed wiring board is configured to be pulled out by being locked by a locking block provided at the end of the guide wall, even if the printed wiring board is simply engaged with the insulator, the lead wire is pulled by the locking of the lead wire itself. Since the printed wiring board is not disengaged by the force applied or the lead wire does not detach from the terminal block at all, the lead wire and the printed wiring board can be supported safely and reliably.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a printed wiring board and an insulator in a brushless motor of the present invention.

FIG. 2 is a perspective view showing a state in which a printed wiring board is attached to the brushless motor of the present invention.

FIG. 3 is a plan view of a stator core provided with insulators.

FIG. 4 is a plan view showing a state in which a stator winding is wound around a stator core on which an insulator is applied.

FIG. 5 is a side view showing a state where a printed wiring board is attached to a stator core.

FIG. 6 is a plan view showing a main part of the brushless motor.

FIG. 7 is a partially cutaway sectional view of the brushless motor of the present invention.

FIG. 8 is an exploded perspective view showing a printed wiring board and an insulator in a second embodiment of the brushless motor of the present invention.

FIG. 9 is a perspective view showing a state in which a printed wiring board is attached to a brushless motor in the second embodiment.

FIG. 10 is a plan view of a stator core provided with insulators in a second embodiment.

FIG. 11 is a plan view showing a state where a stator winding is wound around a stator core.

FIG. 12 is a side view showing a state in which a printed wiring board is attached to a stator core in the second embodiment.

FIG. 13 is a plan view showing a main part of a brushless motor in a second embodiment.

FIG. 14 is a circuit diagram for explaining a connection state of a rotational position detecting element.

FIG. 15 is a cross-sectional view showing a main part of a conventional brushless motor in a cutaway manner.

[Explanation of symbols]

15 stator core 16 stator winding 17 insulator 18,18a casing 21 rotor 24a, 24b, 24c first support wall 25,25b locking claw 27a, 27b second support walls 27a _1, 27b ₁ first, Second guide wall 28, 28a Lock groove 29, 29a Lock block 30 Support block 31 Projection wall 32, 32a Printed wiring board 34 Terminal block 36 Terminal fitting 37, 38 Lead wire 41 Lock pin Hu, Hv, Hw Rotation Position detecting element 42 Through holes b, b ₁ First and second guide passages

Continued on the front page F term (reference) 5E348 AA12 AA27 AA34 AA37 5H019 AA10 BB01 BB15 BB20 CC03 CC07 DD01 EE14 5H604 AA08 BB01 BB17 CC01 CC05 CC11 QB04

Claims (6)

[Claims] 1. A stator core on which a stator winding is wound.
In an electric motor provided with an insulator that insulates a stator core with a synthetic resin having excellent heat resistance and insulation properties in an entire region except an outer peripheral surface, an insulator formed on the stator core is provided with a permanent magnet provided on an outer periphery of a rotor. A printed wiring board provided with a plurality of rotation position detecting elements for detecting a rotation position is detachably mounted close to a coil end portion of a stator winding wound around the stator core. Brushless motor. 2. An insulator for the stator core,
A first support wall on which the lower part of the outer peripheral edge of the printed wiring board is mounted on the outer peripheral side of the stator core, a locking claw having an engaging groove which is detachably engaged with the outer peripheral edge of the printed wiring board; A locking groove for fitting and locking the outer peripheral edges of both ends in the longitudinal direction of the printed wiring board is located inside the first support wall formed orthogonal to the longitudinal end face of the printed wiring board. The brushless motor according to claim 1, further comprising a second support wall. 3. The insulator of the stator core has a plurality of engaging claws provided on the outer peripheral side of the stator core with engaging grooves for removably engaging with the outer peripheral side of the printed wiring board. On the inner peripheral side of the stator core, a mounting pin is formed by projecting through a mounting hole formed on the inner peripheral side of the printed wiring board and projecting a support pin for fixing the top part to the printed wiring board by fusion. The brushless motor according to claim 1, wherein 4. The printed wiring board is formed in an arc shape along an insulator of a stator core, and its outer peripheral edge is mounted on a first support wall provided on the insulator, and the first support wall is provided. A locking claw protruding between the engaging portions is detachably engaged with and held by a locking groove formed in a second support wall of the insulator at both ends in the length direction close to the outer peripheral edge, and the stator winding is formed. 2. The brushless motor according to claim 1, wherein the brushless motor is detachably mounted near the coil end of the wire. 5. The printed wiring board is formed in an arc shape along an insulator of a stator core, and an outer peripheral edge thereof is locked by a locking claw formed on the insulator, and an inner peripheral edge of the printed wiring board is On the inner peripheral side of the stator core, a support pin protruding from the insulator is detachably penetrated and supported, or is fixed by penetrating so as to be mounted close to the coil end of the stator winding. The brushless motor according to claim 1, wherein 6. A lead wire connected to a lead wire of a stator winding and supplying power to the stator winding, and a lead wire supplied from a printed wiring board and supplying power to a rotational position detecting element are connected to a stator core. The pair of first and second guide walls formed at positions on the extension of the first and second support walls on the outer peripheral side are led out in directions opposite to each other, and these lead wires are led out. At the opposite end of each of the guide walls, a locking block is formed to bend each lead wire substantially at a right angle and to individually guide the wire while being locked to the insulator. The brushless motor according to claim 1.