JP2002153003A - Stator for motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify operation process, reduce variations in characteristics, and provide a coil connecting structure which contributes to the enhancement of reliability by reducing the points of connection between coils and concentrated portions. SOLUTION: A starting portion 3a and an ending portion 3b of each of winding portions 3 wound on the plurality of the teeth 2, etc., provided on a stator core 1 are connected to concentrated portions 4 with prescribed phases, respectively. The stator is provided with a seamless connecting portion S, where the starting portion 3a and the ending portion 3b of at least one set of adjoining winding portions 3 and 3 are not disconnected, and are continuously connected to a concentrated portion 4 with a prescribed phase at one point.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor stator for connecting each winding portion of a motor (such as a brushless motor) to a predetermined-phase consolidation portion (bus bar).

[0002]

2. Description of the Related Art In general, in connection of lead wires of each winding portion of a low-voltage, large-current motor such as a motor of a vehicle power steering system or an industrial motor having a relatively large output, connection of each winding portion is performed. In order to ensure and simplify the process, the terminals of each winding section are connected to a predetermined phase
Is connected (wired) to an external connector via a. Then, a current from the external connector passes through the concentrating portion of a predetermined phase, is sent to each winding portion, and each winding portion is excited.

A conventional motor stator is shown in FIG.
As shown in a simplified development of FIG. 1, each tooth portion 42 of the stator core 41 having a plurality of (in the illustrated example, nine) tooth portions 42.
The start end 43a and the end 43b of each of the winding portions 43 wound around are connected to a collecting portion (bus bar) 44 of a predetermined phase (U phase, V phase, W phase) (9 slots). Delta connection).

[0004] Specifically, the first, fourth and seventh (♯1,
The starting part 43a of the winding part 43 of # 4, # 7) is a U-phase consolidation part
The terminal 44a is connected to the V-phase concentrating part 44b. Further, the starting end 43a of the second, fifth, and eighth (# 2, # 5, # 8) winding portions 43 is connected to the V-phase consolidation portion 44b, and
The terminal end 43b is connected to the W-phase consolidation unit 44c. The third, sixth, and ninth (# 3, # 6, # 9) winding portions 43
The start end 43a is connected to the W-phase consolidation part 44c, and the end part 43b is connected to the U-phase consolidation part 44a. In short, the starting end 43a and the ending part 43b of the adjacent winding parts 43, 43 are separately (at two points) connected to the consolidation part 44 of the same phase.
Are connected to the consolidation unit 44 in a total of 18 locations (= 3 phases x
3 places x 2 points).

[0005]

However, in the conventional motor stator, the independent winding portions 43 are wound around the individual teeth portions 42 and connected to the gathering portions 44, respectively. Section (coil wire) 43 must be cut for each tooth section 42, and the number of cut points of the winding section 43 increases, and the number of connection points of the winding sections 43 to the gathering sections 44 increases (18 places). The following problems have occurred. The connecting point between the winding part 43 and the gathering part 44 is fusing,
Because it must be connected by welding, caulking, soldering, etc.
The man-hour is increased. The contact resistance at the connection between the winding part 43 and the concentrating part 44 increases, and the characteristics deteriorate. Since there are many connection points between the winding part 43 and the collecting part 44, heat generation,
An operation failure due to dropout or opening is liable to occur, and reliability is reduced.

SUMMARY OF THE INVENTION It is an object of the present invention to reduce the number of connection points between a winding part and a consolidation part, thereby simplifying a work process, reducing variations in characteristics, and improving reliability.

[0007]

In order to achieve the above object, a motor stator according to the present invention comprises a stator core having a plurality of teeth and a starting end of each winding wound around each of the teeth. In the motor stator in which the end portions are respectively connected to the convergence portion of a predetermined phase, the start end portion and the end portion of at least one pair of adjacent winding portions are formed in a continuous shape without being cut. Are provided with seamless connection portions connected at one point to the connection portion of the phase.

[0008] With this configuration, the number of connection points between the winding part and the concentrating part can be reduced, and the number of steps for connecting by fusing, welding, caulking, soldering or the like can be reduced.
In addition, the contact resistance at the connection between the winding part and the concentrating part is reduced, and the characteristics are improved. Furthermore, the number of connection points between the winding part and the concentrating part is reduced, and operation failure due to heat generation, dropout, and opening is less likely to occur, and reliability is improved. Moreover, the number of connection points between the winding part and the concentrating part is reduced, and stable supply of quality can be achieved.

Further, the seamless connection portion is configured to connect the coil wire to the connection portion of a predetermined phase in a hook-like manner. Therefore, the winding portion can be reliably connected to the gathering portion, and the reliability and quality are further improved.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing embodiments.

FIGS. 1 and 2 show an embodiment of a motor stator according to the present invention, in which a starting end of each winding portion 3 wound around each tooth portion 2 of a stator core 1 having a plurality of teeth portions 2... The part 3a and the terminal part 3b are connected to the consolidation part 4 of a predetermined phase, respectively, and the starting part 3a and the terminal part 3b of at least one pair of adjacent winding parts 3, 3 are not cut (seam). (None) and has a seamless connection portion S connected at one point to the connection portion 4 of a predetermined phase.

This stator is used, for example, in a motor of a power steering system for a vehicle, as shown in FIG. 1, and is connected to an external connector (not shown) via a gathering portion (bus bar) 4 of a predetermined phase (see FIG. 1). The connected (wired) winding portion 3 is configured to be excited by power supply from an external connector. In addition, this stator is suitable for a lead-out process of a winding portion of a low-voltage / high-current motor (such as a brushless motor) or an industrial motor having a relatively large output. Reliable and simplified.

In a vehicle power steering system, when a vehicle driver turns a steering wheel, oil whose pressure is increased is supplied from a hydraulic pump into a cylinder in an amount corresponding to the rotation amount of the steering wheel, and the movement of the piston causes the steering wheel to rotate. This reduces the operating force. In such a power steering system for a vehicle, a motor is generally used as a drive source of the hydraulic pump, and the amount of oil from the hydraulic pump is controlled by controlling the drive of the motor according to the rotation amount of the steering wheel and the vehicle speed. Has been adjusted.

Referring to FIG. 1, a detailed description will be given.
Numeral 20 is coaxially coupled to a hydraulic pump unit 19 mounted thereon, and is configured to apply a rotational driving force to the hydraulic pump unit 19 to drive the hydraulic pump unit 19.

The motor section 20 has a motor housing 25, and a rotary shaft 21 is mounted inside the motor housing 25 via a pair of upper and lower bearings 24,24. A rotor (magnet) 26 is fixed below the rotating shaft 21, and a stator 27 (consisting of the stator core 1 and the winding portions 3) is fixed so as to surround the rotor 26. In addition, a back yoke 22 to which a ring magnet 23 is attached is fixed above the rotary shaft 21.

The ring magnet 23 is used for a sensor, and is formed and arranged so that the pitch of the magnetic poles of the rotor 26 changes. A sensor 28 (such as a Hall element, a Hall IC, a magnetoresistive element, etc.) is attached to a substrate 29 so as to face the side surface of the ring magnet 23.

The sensor 28 detects the phase between the rotor 26 and the stator 27 via the ring magnet 23 and sends a predetermined current to the stator 27 (the winding part 3) via the concentrating part 4, The rotor 26 can be rotated in a desired direction. That is, when the rotating shaft 21 is rotated, the control circuit 30 operates based on the phase of the ring magnet 23 (the rotor 26 and the stator 27) detected by the sensor 28 so that the stator 27 (the winding 3) is rotated. Send current (from external connector) to excite.

As described above, the power steering system for a vehicle is configured such that the control circuit 30 controls the rotation operation of the motor unit 20 and thereby controls the amount of oil supplied to the cylinder.

Next, as shown in FIG.
Is a cylindrical laminated iron core, and a plurality of (9 in this embodiment) teeth portions 2 are provided so as to protrude inward in the radial direction.
Are arranged in the circumferential direction. A winding part 3 is wound around each tooth part 2. At this time, for every predetermined number (three) of the teeth portions 2 in the circumferential direction,
The winding portions 3 are wound continuously by the coil wires. In order to facilitate the description, as shown in FIG. 3 (A), the winding portions 3...
1) to the ninth (# 9) winding portion 3

More specifically, the first (# 1) to the third (# 1)
(# 3) winding portions 3 are formed continuously by one coil wire, and the fourth (# 4) to sixth (# 6) winding portions 3 ...
The seventh (# 7) to ninth (# 9) winding portions 3 are formed continuously with one coil wire.

That is, in the first to third winding portions 3.
An end portion 3b of the first winding portion 3 and a starting end portion 3a of the second winding portion 3 are formed continuously by one coil wire,
A bridging line 13 connecting the first winding part 3 and the second winding part 3 is formed, and the terminal end part 3b of the second winding part 3 and the third winding part 3
Is formed continuously with one coil wire to form a bridging line 13 connecting the first winding part 3 and the second winding part 3. In short, the start end 3a and the end 3b of the two sets of the adjacent winding portions 3, 3 are each formed continuously by one coil wire. Since the fourth to sixth winding units 3 and the seventh to ninth winding units 3 have the same configuration, description thereof will be omitted. The starting end 3a of the winding part 3
Is the beginning of winding of the winding part 3 and the end part 3b of the winding part 3
Is the end of winding of the winding part 3, and in the counterclockwise direction of the stator core 1, the starting end 3 a is arranged on the upstream side of the winding part 3, and the ending part 3 b is arranged on the downstream side of the winding part 3. Is established.

Next, as shown in FIG. 2, a plurality (three in this embodiment) of concentrators 4 are provided, each of which is defined in a predetermined phase. More specifically, the U-phase gathering part 4a
The three-phase concentrating parts 4 of the V-phase concentrating part 4b and the W-phase concentrating part 4c are arranged. And the consolidation unit 4 (of a predetermined phase)
Has a role of sending a current from an external connector (not shown) to the winding part 3 connected to the concentrating part 4 (of a predetermined phase). Therefore, by sequentially passing a current through the concentrating portion 4 of each phase, the winding portions 3 can be regularly excited,
The rotating shaft 21 (and the rotor 26) shown in FIG. 1 can be rotated.

As shown in FIG. 4, the U-phase gathering portion 4a
A ring-shaped (substantially C-shaped) (thin plate) body portion 5 partially cut away, three connection portions 6 attached radially outward to both ends and an intermediate portion of the body portion 5, A mounting part 7 mounted radially outward in a middle part of the part 5, wherein the connecting part 6 and the mounting part 7 are disposed at a position higher than a plane of the main body 5 (with a rising part). . Further, the connecting portion 6 has two bent portions 8 at the distal end thereof, and the attaching portion 7
A mounting hole 9 is provided at the tip of the mounting hole 9.

As shown in FIG. 5, the V-phase concentrating portion 4b
A ring-shaped (substantially C-shaped) (thin plate) body portion 5 partially cut away, three connection portions 6 attached radially outward to both ends and an intermediate portion of the body portion 5, A mounting part 7 mounted radially outward in a middle part of the part 5, the mounting part 7 is disposed at a position higher than the plane of the main body 5 (with a rising part), and the connecting part 6 is , (With a falling portion) is disposed at a position lower than the plane of the main body 5. The connecting portion 6 has one bent portion 8 at the tip thereof, and the mounting portion 7 has a mounting hole 9 formed at the tip thereof.

As shown in FIG. 6, the W-phase consolidation portion 4c
A ring-shaped (substantially C-shaped) (thin plate) body portion 5 partially cut away, three connection portions 6 attached radially outward to both ends and an intermediate portion of the body portion 5, A mounting part 7 mounted radially outward in a middle part of the part 5, the mounting part 7 is disposed at a position higher than the plane of the main body 5 (with a rising part), and the connecting part 6 is , Are arranged at the same position as the plane of the main body 5. The connecting portion 6 has one bent portion 8 at the tip thereof, and the mounting portion 7 has a mounting hole 9 formed at the tip thereof.

The height from the main body 5 to the mounting hole 9 of the mounting portion 7 is determined by the V-phase collecting portion 4b and the W-phase collecting portion 4b.
It is configured to increase in the order of the c and U-phase consolidation parts 4a.

As shown in FIG. 7, the U-phase concentrating portion 4a, the V-phase concentrating portion 4b, and the W-phase concentrating portion 4c are connected to a case portion 10 composed of an upper case portion 10a and a lower case portion 10b. It is installed. More specifically, the mounting holes 9 of the mounting portions 7 of the U-phase, V-phase, and W-phase gathering portions 4a, 4b, and 4c are mounted on the case portion 10 with mounting pins 11 on the same plane. , And the body part 5 is surrounded by the case part 10, and
The connection portions 6 project from the case portion 10. Since the mounting pins 11 are connected to an external connector (not shown), the three-phase concentrating portions 4a, 4b, and 4c are connected to the external connectors via the mounting pins 11, respectively. .

At this time, as shown in FIG. 7 (B), the main body 5 is moved from the lower part to the upper part in the order of the U-phase consolidation part 4a, the W-phase consolidation part 4c, and the V-phase consolidation part 4b. With a gap,
Laminated. As shown in FIG. 7A, the connecting portions 6... And the mounting portion 7 are arranged in the order of the U-phase concentrating portion 4a, the V-phase concentrating portion 4b, and the W-phase concentrating portion 4c in the counterclockwise direction. To
It is arranged.

As shown in FIG. 2, the case 10 to which the three-phase consolidating parts 4 are mounted is attached to the upper part of the stator core 1 through mounting pieces 12 arranged in the circumferential direction of the case 10. To be mounted on. Also, the starting end 3a of the winding part 3
And the end part 3b are connected to the consolidation part 4 of a predetermined phase, respectively, and the start end part 3a and the end part 3b of the six sets of adjacent winding parts 3, 3 are continuous with one coil wire. (6
Are connected at one point to the junction 4 of a predetermined phase.

More specifically, as shown in FIGS. 2, 3 and 8, in the first to third winding portions 3,... And a bridging line 13 connecting the first winding part 3 and the second winding part 3 to the connecting part 6 of the V-phase collecting part 4b,
Bridging line 13 connecting the second winding part 3 and the third winding part 3
Are connected to the connecting portion 6 of the W-phase concentrating portion 4c, the terminal portion 3b of the third winding portion 3 is connected to the connecting portion 6 of the U-phase concentrating portion 4a, and the first to third windings are connected. Line part 3 ...
It is connected to the gathering units 4. Also, the fourth to sixth winding portions 3 and the seventh to ninth winding portions 3 have the same configuration, and therefore, a three-phase concentrating portion of nine winding portions 3. Connections to 4 ... (9-slot delta connection) are a total of 12 locations.

In short, in the present stator, at least one set of adjacent winding portions 3 and 3 has a starting end 3a and an ending portion 3b as a bridge wire 13 formed continuously by one coil wire. Is connected at one point to the consolidation part 4 of
Conventional example (of FIG. 13) {starting end of adjacent winding portions 43, 43
The point 43a and the termination 43b are connected at one point, compared with ───, which is connected separately (at two points) to the consolidation part 44 of the same phase. And the number of connection points can be reduced. In other words, it can be said that the present stator is configured to be connected to the collecting unit 4 without cutting the coil wire (the winding part 3) as much as possible.

Next, the connection of the winding part 3 to the connection part 6 of the U-phase concentrating part 4a will be described. As shown in FIG. 9, the starting part 3a and the ending part 3b of the winding part 3 are respectively Are connected to the connection portion 6 (by resistance welding, fusing, etc.) between the bent portions 8 of the connection portion 6. The connection of the winding portion 3 to the connection portion 6 of the V-phase concentration portion 4b and the W-phase concentration portion 4c will be described. As shown in FIG.
The connection portion 13 is sandwiched between the bent portions 8 of the connection portion 6 and hooked to the connection portion 6 (by resistance welding, fusing, or the like). In short, the seamless connection portion S has a predetermined phase. It is configured to connect the coil wire to the gathering portion 4 in a hook shape.

Next, FIG. 11 shows another embodiment of the present stator, and the following configuration is clearly different from FIG. That is, as shown in FIG.
9) are formed continuously by one coil wire, and the windings 3 between the first to ninth (# 1 to # 9) windings 3 are formed.
The bridging lines 13 at the locations are respectively
Connected at points. Therefore, except for the starting end 3a of the first (# 1) winding part 3 and the ending part 3b of the ninth (# 9) winding part 3, they are connected to the gathering parts 4 by bridging lines 13. Thus, the connection points (9-slot delta connection) of the nine winding sections 3 to the three-phase consolidation sections 4 are 10 in total, and the connection points can be further reduced.

As shown in FIG. 11, the starting end 3a of the first (# 1) winding portion 3 and the ending portion 3b of the ninth (# 9) winding portion 3 form a U-phase assembly. The connecting portions 6 are connected to the bent portions 8 and 8 of the connecting portion 6 of the portion 4a, respectively, as shown in FIG. , The start end 3a and the end 3b may be connected together, and the number of connection steps can be reduced.

Therefore, by using the present stator described above in this power steering system for a vehicle, the number of connection points between the winding portions 3 and the concentrating portions 4 is reduced.
The characteristics can be improved, and the operating force of the steering wheel can be reliably reduced.

The winding portion 3 (starting end 3a / ending end 3b
In the connection portions (such as the seamless connection portions S) of the bridging lines 13) and the connection portions 4 (connection portions 6), the film insulator (such as polyurethane, polyester, polyesterimide, polyamideimide, or polyimide) is peeled off. Are electrically connected.

The present invention is not limited to the above embodiment, but may be applied to phases other than three phases, and may be applied not only to inner rotor type motors but also to outer rotor type motors. As the method of winding the stator, not only the inner winding that winds from the inner peripheral side of the stator core as in the inner rotor type motor of the embodiment but also the outer winding that winds from the outer peripheral side (the inner rotor type motor and the outer winding) The present invention can be similarly applied to a (rotor type motor), and the shape of the connecting portion 6 of the concentrating portion 4 can be changed in design without departing from the gist of the present invention.

[0038]

According to the present invention, since the number of connection points between the winding portion and the concentrating portion can be reduced, the connection work process can be simplified, the cost can be reduced, and a motor of good quality (with few failures and defects) can be provided. Stable supply is possible, reliability is improved, contact resistance is reduced, and motor characteristics are improved.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an application example of the present invention.

FIG. 2 is a configuration explanatory view showing one embodiment of the present invention.

FIG. 3 is a configuration explanatory view showing a stator core and a winding part.

FIG. 4 is a configuration explanatory view showing a U-phase concentrating unit.

FIG. 5 is a configuration explanatory view showing a V-phase concentrating unit.

FIG. 6 is a configuration explanatory view showing a W-phase concentrating unit.

FIG. 7 is an explanatory diagram showing a state in which a U-phase / V-phase / W-phase gathering unit is assembled.

FIG. 8 is a simplified development view of the present invention.

FIG. 9 is an explanatory diagram of an enlarged configuration of a main part.

FIG. 10 is an explanatory diagram of an enlarged configuration of a main part.

FIG. 11 is a simplified development view showing another embodiment of the present invention.

FIG. 12 is an enlarged view of a main part showing another embodiment.

FIG. 13 is a simplified development view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stator core 2 Teeth part 3 Winding part 3a Start end part 3b End part 4 Concentration part S Seamless connection part

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5H603 AA09 BB01 BB07 BB10 BB12 CA01 CA05 CB04 CB11 CB12 CB18 CB26 CC11 CD01 CD04 CD14 CD21 CE01 EE01 EE04 EE08 EE09 EE12 EE13 FA16 FA25 FA29 5H604 AA08 BB01 CC PB02 PB03 PC01 PC03 QB03 QB14 5H615 AA01 BB01 BB07 BB14 BB16 PP01 PP15 QQ02 QQ09 QQ19 SS11 SS16 SS18 TT26 TT35 TT39

Claims (2)

[Claims] 1. A motor stator, wherein a starting end and a terminating end of each winding portion wound around each tooth portion of a stator core having a plurality of teeth portions are connected to a motor stator connected to a predetermined-phase gathering portion. At least one set of adjacent winding portions is provided with a seamless connection portion connected at one point to a predetermined-phase consolidation portion so that the start and end portions thereof are not cut off and are continuous. A stator for a motor. 2. The motor stator according to claim 1, wherein the seamless connection portion is configured so as to hook the coil wire to a connection portion of a predetermined phase.