JP2002010552A - Rotating field type electric motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotating field type electric motor decreasing a difference of resistance between each winding to simplify a structure and make assembly workability improvable. SOLUTION: A stator 1 for a brush-less motor winds a winding 6 in each phase to a plurality of teeth 4. The winding 6 has three phases, the winding 6 of each 1 phase is respectively connected and arranged over a plurality of the teeth 4. The winding 6 in each phase is connected to an input part of each phase inputting one end 6a from the outside. After winding to the last tooth 4 is ended, the other end 6b of the winding 6 in each phase is axially extended and connected to the common terminal part between the teeth 4. A fitting part 8 over a circumference is formed in upper/lower both ends of an external peripheral surface of each insulator 5 almost cylindrically provided in an outer side end part of the teeth 4. A brass-made C-shaped bar 9 is pressure fitted to the fitting part 8. A bar 9 is formed in circular arc shape of 240 deg. or more. One end 6a and the other end 6b of the winding 6 are arranged in an upper side of the stator 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating magnetic field type electric motor.

[0002]

2. Description of the Related Art A motor disclosed in, for example, Japanese Patent Application Laid-Open No. 5-3078738 is known as a rotating magnetic field type motor. As shown in FIG. 9, a stator core 34 is provided with a stator winding 34 via an insulating layer (insulator) 32. Each phase has teeth facing each other
A winding 34 is applied to 33 to form two salient poles.

[0003] One end 34a of a winding 34 constituting each phase is
It is connected so as to be connected to an output terminal of a drive circuit (not shown). The other end 34b of the winding 34 is directly connected to have the same potential, and a neutral point connection 39 is formed. The other ends 34b of the windings 34 of each of the three phases are routed from adjacent teeth (teeth) 33 at intervals of 60 ° to form a neutral point connection 39.

[0004] On the upper part of the insulating layer (insulator) 32, two plates are provided in parallel in the circumferential direction, and a stopper 40 is provided.
Are formed. The neutral point connection 39 is provided in the stopper 40.
Is inserted and fixed with an adhesive.

[0005]

In the above configuration, each winding 3 from each tooth (teeth) 33 to the neutral point connection 39 is provided.
There is a length difference between the four. This difference in length is a resistance difference, and is affected by motor characteristics. And if the three-phase winding is connected to 8 poles-9 slots, the neutral point line comes out from the last wound tooth at 120 ° intervals, so each winding until the neutral point connection It is routed. For this reason, the distance in which the windings are routed increases, and the difference in length between the windings also increases. Therefore, there is a problem that the resistance difference between the windings also increases, and the motor characteristics may deteriorate.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a rotating magnetic field type electric motor which has a small resistance difference between windings, has a simple structure, and can be easily assembled. To provide.

[0007]

In order to solve the above-mentioned problems, the present invention is directed to a rotating magnetic field type motor having a stator in which windings are wound around a plurality of teeth for each phase. And the winding has n or more phases,
One-phase windings are respectively arranged continuously over a plurality of teeth. One end of each phase winding is connected to an input section of each phase input from the outside. After the final teeth winding is completed, the teeth extend in the axial direction and are connected to the common terminal portion, and include the teeth so as to prevent conduction between the teeth and the windings, and extend around the circumference in the axial end direction of the outer peripheral surface. An insulator provided with a support portion, wherein the common terminal portion is made of a conductive material and is supported by the support portion; [360 (n-1)
/ N] ° or more.

Therefore, according to the present invention, the other end of each winding extends in the axial direction and is connected to the common terminal. Therefore, the processing can be performed without routing the other end of the winding, and the resistance difference between the windings can be reduced. In addition, since the common terminal portion is supported by the supporting portion of the insulator and assembled, the assembly is simplified. The common terminal portion is made of a conductive material, and is formed of [360 (n-
1) Because of the provision of the arc portion of not less than / n] °, it is possible to conduct the other end of each winding without running around the adjacent teeth.

According to a second aspect of the present invention, in the first aspect, the supporting portion includes a fitting portion into which the common terminal portion is fitted. Therefore,
According to the present invention, in addition to the operation of the first aspect, assembly of the common terminal unit becomes easy.

According to a third aspect of the present invention, in the first or second aspect, one end and the other end of the winding are arranged on the same side of the stator. Therefore, according to the present invention, in addition to the functions of claim 1 or claim 2, the operation of guiding the winding from one end to each tooth, the operation of crimping the common terminal, and the operation of connecting the other end to the common terminal are performed. Can be performed from the same side of the stator, so that the work can be performed easily.

According to a fourth aspect of the present invention, in the first aspect of the present invention, the other end of the winding is connected to the common terminal between the teeth. The point is that Therefore, according to the present invention, in addition to the operation of any one of claims 1 to 3, the other end of the winding is less likely to contact the teeth constituting the stator, and the possibility of electric leakage is reduced.

According to a fifth aspect of the present invention, in the first aspect of the present invention, the common terminal portion is a substantially C-shaped metal ring. And Therefore, according to the present invention, in addition to the function of any one of the first to fourth aspects, the size of the common terminal can be reduced, and the material cost can be reduced.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment in which the present invention is embodied in a three-phase nine-slot brushless motor as a rotating magnetic field motor will be described below with reference to FIGS.

FIG. 1A is a plan view of a stator of a brushless motor. FIG. 1B shows a front view thereof, and FIG. 2 shows a perspective view thereof. The stator 1 includes an iron outer core 2 and an iron inner core 3. The outer core 2 has an annular shape.

The inner core 3 is provided with nine teeth 4 which extend in the radial direction and are arranged at regular intervals in the rotational direction. Nine resin-made insulators 5 are provided in a substantially cylindrical shape at the tip (outer end) 4a of the teeth 4. The base end (inner end) of the tooth 4 is mutually connected to the adjacent one, and the connection forms the annular portion 4b. In addition, the base end and the tip 4a of the teeth 4
The portion between the two is defined as the winding part 4c of the tooth 4. The outer core 2 is assembled to the inner core 3 in a state where the outer peripheral surface of each insulator 5 and the inner peripheral surface of the outer core 2 are in contact with each other.

A winding 6 is wound around the winding winding portion 4c of each tooth 4. The stator 1 is wound with three windings 6 corresponding to three phases. As shown in FIG. 4A, one winding 6 is connected to three adjacent teeth 4.
Are sequentially wound around the winding winding portion 4c. The winding 6 is wound so that the winding directions of the adjacent teeth 4 are reversed.

One end 6a and the other end 6b of each winding 6 wound around each tooth 4 are drawn out so as to extend above the stator 1, respectively. Each of the one end 6a and the other end 6b is arranged at an interval of about 120 °.

As shown in FIG. 1, a power line insertion claw 7 is fixed to one end 6a of each winding 6. A power line (not shown) as an input line for each phase from the outside is inserted into the power line insertion claw 7 from above the power line insertion claw 7 and connected to one end 6a by soldering. That is, the power line and the winding 6 are electrically connected via the power line insertion claw 7.

On the outer peripheral surfaces at both upper and lower ends of the insulator 5, fitting portions 8 as supporting portions are formed in a circular shape. A bar 9 as a common terminal portion is fitted to the fitting portion 8 in a crimped state. The bar 9 is made of metal (brass in this embodiment) as a conductive material, and is formed in a C-shaped ring shape. Since the winding has three phases (n = 3), the bar 9 is formed in an arc shape of [360 (n-1) / n] ° = 240 ° or more. The position of the bar 9 in the thrust direction as the vertical direction of the insulator 5 is determined by the fitting portion 8. Since the bar 9 is made of brass, it has elasticity, and is fitted and fixed to the fitting portion 8 in a crimped state.

As shown in FIGS. 1 and 2, on the upper side of the bar 9,
Three engaging claws 10 protrude at 120 ° intervals. The bar 9 is fitted to the fitting portion 8 such that the engaging claw 10 is arranged between the teeth 4. A C-shaped caulking portion 10a is provided on the upper part of the engagement claw 10. FIG.
As shown in (a), between the caulking portions 10a, the winding 6
Is inserted through the other end 6b. The other end 6b is a caulking portion 10
The other end 6b, which is sandwiched by a, and the caulked portion 10a are connected by caulking solder. That is, the other end 6b and the bar 9 are electrically connected, and the bar 9 becomes a neutral point.

Next, the stator 1 constructed as described above will be described.
Will be described. First, after the insulator 5 is coupled to the inner core 3, the windings 6 are wound around the respective teeth 4 provided on the inner core 3. Next, the outer core 2 is press-fitted into the inner core 3. Thereafter, the bar 9 is fitted into the fitting portion 8 and the engaging claw 10 of the bar 9 is fitted.
Is connected to the other end 6b of the winding 6.

FIG. 4 (a) is a schematic plan view showing how the winding 6 is wound around the teeth 4, and FIG. 4 (b) is a partial schematic development view. Of the three adjacent teeth, the winding 6 continuing from one end 6a to the tooth I located on the left side in FIG.
In (b), it is wound left-handed. After the winding 6 is wound around the tooth I a predetermined number of times, the winding is wound around the tooth II.
A winding 6 is wound around the tooth II in a direction opposite to that of the tooth I. A winding 6 continuing from the lower end of the tooth I is guided to the lower end of the tooth II, and is wound around the tooth II in the right-hand direction in FIG.

After the winding 6 is wound around the tooth II, the tooth III is wound. The winding around the teeth III is a left-hand winding in FIG. After the winding 6 is wound around the teeth III, the other end 6b of the winding 6 is
Since it is connected to 0, it is guided upward and is connected to the engagement claw 10.

Next, the stator 1 constructed as described above will be described.
The brushless motor 11 having the following will be described. FIG.
As shown in FIG. 1, the stator 1 is housed in a housing. The housing includes a lower housing 12 made of metal and an upper housing 13 made of resin. In the stator 1, the outer peripheral surface of the outer core 2 is fitted and fixed to a cylindrical portion of a lower housing 12 formed in a bottomed cylindrical shape.

An iron shaft 14 is rotatably supported by the housings 12 and 13 via bearings 15. The shaft 14 is provided with a magnet 16 constituting a rotor at a position corresponding to the stator 1.
The magnet 16 is covered with a non-magnetic magnet cover 17. The shaft 14 is provided with a plurality of sensor magnets 18 at predetermined intervals above the magnets 16.

As shown in FIGS. 5 and 6, a resin support member 19 supported by a claw 19a extending radially from between the teeth 4 is provided inside the upper portion of the insulator 5.
Is provided. The support member 19 has an inner flange 19b at the upper part of the cylinder, and three protrusions 20 are provided at 120 ° intervals at positions near the inner periphery of the upper surface of the flange and at positions opposing the sensor magnet 18. Each protrusion 20
Each has a hole IC insertion groove 20a. The Hall IC 21 is fitted in each Hall IC insertion groove 20a. A through hole 22 a is formed in the substrate 22 attached to the upper housing 13,
Are inserted through the through holes 22a and fixed by soldering.

When mounting the Hall IC 21, the Hall IC 21 is fitted and fixed in the Hall IC insertion groove 20a.
The foot 21a is inserted into the through hole 22a of the board 22, and soldering is performed.

The brushless motor 1 constructed as described above
In 1, a current is supplied to each winding 6 from a power line, a rotating magnetic field is generated in the stator 1, and the shaft 14 rotates together with the rotor.

The Hall IC 21 is a magnet 18 for the sensor.
Is detected, the amount of rotation of the shaft 14 from the reference position is detected, the current is controlled based on the detected position, and the synchronous rotation of the shaft 14 is controlled.

As described in detail above, the brushless motor 11 of this embodiment has the following effects. (1) A common terminal for connecting neutral wires of three-phase windings
Since the C-shaped ring-shaped conductive bar 9 having an arc of 0 ° or more is used, the processing can be performed without routing the other end 6b of the winding 6. The resistance difference between the windings 6 of each phase is reduced, and the motor characteristics are improved. Further, assemblability is improved.

(2) The bar 9 is fitted to the fitting portion 8 as an empty space of the insulator 5. Therefore, the space in the vertical direction of the insulator 5 can be effectively used, and the structure can be simplified.

(3) One end 6a and the other end 6b of the winding 6 are arranged on the upper side as the same side of the stator 1. Accordingly, the operation of guiding the winding 6 from the one end 6a to each tooth 4, the operation of crimping the bar 9 and the operation of connecting the other end 6b to the bar 9 can be performed from the same side of the stator 1, thereby facilitating the operation.

(4) The other end 6b of the winding 6 is connected to the bar 9 between the teeth 4. Therefore, when the film on the other end 6b is removed, the other end 6b is less likely to come into contact with the teeth 4, and the possibility of electric leakage is reduced.

(5) Since the bar 9 is a C-shaped ring along the fitting portion 8, the size can be reduced and the material cost can be reduced. (6) The winding 6 has a three-phase star connection. Therefore, the other ends 6b of all the windings 6 can be connected to the bar 9.

(7) Insulator 5 and support member 19
Is formed of resin. Therefore, the insulator 5 or the support member 19 is not limited to resin, and the manufacturing process can be simplified as compared with a case where the insulator 5 or the support member 19 is formed of, for example, porcelain.

(8) Fitting portions 8 are provided at both upper and lower ends of each insulator 5, and each insulator 5 is formed vertically symmetrically. Therefore, there is no need to determine whether the insulator 5 is up or down when assembling the insulator 5.

(9) The hole I is inserted in the hole IC insertion groove 20a.
By inserting C21, the displacement of the Hall IC 21 is caused only by the accuracy of the support member 19. Therefore, as compared with a case where the Hall IC 21 is not inserted into the Hall IC insertion groove 20a, a positional shift and a phase shift of the Hall IC 21 can be prevented.

The embodiment is not limited to the above embodiment, but may be modified as follows. In the above embodiment, the other end 6b of the winding 6 is
a and was crimped and connected to the bar 9. As shown in FIG. 3B, the bar 9 is provided with a projection 23 having a groove 23a, instead of the engagement claw 10 and the caulking portion 10a. The other end 6b may be inserted into the groove 23a and spot-welded to connect the other end 6b to the bar 9.

The winding 6 is not limited to a flat conductor, but is shown in FIG.
As shown in FIG. The bar 9 as the common terminal may not be a C-shaped ring as long as it has an arc-shaped portion extending over a range of 240 ° or more.

The fitting portion 8 is not limited to a step shape, but may be, for example, a fitting groove. -One end 6a and the other end 6b of the winding 6 need not be arranged on the same side of the stator 1.

The position where the other end 6b is connected to the bar 9
It does not have to be between the teeth 4. The insulator 5 is not limited to the vertical symmetry, and the fitting portion 8 may be formed only at one end.

.3-phase 9-slot brushless motor 11
The present invention is not limited to this, and can be applied to the brushless motor 11 having three phases and six slots, or n phases such as four phases and five phases (n is a natural number of 3 or more)
May be applied to the rotating magnetic field type electric motor.

The insulator 5 and the supporting member 19 are not limited to those made of resin, but may be made of, for example, porcelain. Next, technical ideas other than those described in the claims that can be understood from the above embodiments are described below together with their effects.

(A) In the invention according to any one of claims 1 to 5, the winding is formed in three phases. According to this configuration, the control of the rotating magnetic field type electric motor is simplified.

(B) In the invention described in any one of claims 1 to 5 or the technical idea (a), the insulator is formed of a resin. According to this configuration, the manufacturing process can be simplified as compared with the case where the insulator is formed of porcelain or the like, and the weight of the rotating magnetic field type motor can be reduced.

[0046]

As described in detail above, according to the first to fifth aspects of the present invention, the resistance difference between the windings is small,
The structure is simple and the assemblability can be improved.

[Brief description of the drawings]

FIG. 1A is a schematic plan view of a stator, and FIG. 1B is a schematic front view.

FIG. 2 is a schematic perspective view of a stator.

3A is a perspective view in which the connection between the other end of the winding and the bar is performed by caulking solder, and FIG. 3B is a perspective view in which spot connection is performed.

FIG. 4A is a schematic plan view showing a winding state of a winding;
(B) is a partial schematic development view.

FIG. 5 is a schematic sectional view of a brushless motor.

FIG. 6 is a plan view of the stator with a support member attached.

FIG. 7 is a perspective view of a support member.

FIG. 8 is a schematic developed view showing the relationship between the Hall IC and the Hall IC insertion groove.

FIG. 9 is a plan view showing a conventional stator.

[Explanation of symbols]

1 ... stator, 4 ... teeth, 6 ... winding, 6a ... one end,
6b: the other end, 5: an insulator, 8: a fitting part as a support part, 9 ... a bar as a common terminal part, 11 ... a brushless motor as a rotating magnetic field type electric motor.

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Shumitsu Oda 390 Umeda, Kosai-shi, Shizuoka Asmo Co., Ltd.F-term within the company (reference) CA05 CA10 CB04 CB11 CB18 CB26 CC11 CD01 CD04 CD14 CD21 CE01 EE03 EE13 FA02 FA11 FA16 5H604 AA05 AA08 BB01 BB10 BB14 BB16 BB17 CC01 CC05 CC16 DA01 DA14 DB01 DB03 DB26 PC01 QB01 QB14 5H621 BB07 GB10 GA10

Claims (5)

[Claims] 1. A rotating magnetic field type motor having a stator in which windings are wound around a plurality of teeth for each phase, wherein the windings have three or more n-phases, and each winding has one phase. The windings of each phase are successively arranged over a plurality of teeth, and one end of each phase winding is connected to the input section of each phase input from the outside, and the other end of the winding of each phase is connected to the final tooth. After the winding is completed, the supporting portion extends in the axial direction and is connected to the common terminal portion, includes the tooth so that the tooth and the winding do not conduct, and includes a support portion extending circumferentially in the axial end direction of the outer peripheral surface. The common terminal portion is made of a conductive material, and is provided with an arc-shaped portion supported by the support portion and extending over a range of [360 (n-1) / n] ° or more. A rotating magnetic field type electric motor characterized by the above-mentioned. 2. The rotating magnetic field type electric motor according to claim 1, wherein said support portion includes a fitting portion into which said common terminal portion is fitted. 3. The rotating magnetic field type electric motor according to claim 1, wherein one end and the other end of the winding are arranged on the same side of the stator. 4. The other end of the winding is connected to the common terminal between the teeth.
The rotating magnetic field type electric motor according to any one of the above. 5. The rotating magnetic field type electric motor according to claim 1, wherein the common terminal is a substantially C-shaped metal ring.