JPH09170530A - Unbalance correction method for rotor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an unbalance correction method suitable for a rotor small and to be used for high speed rotation. SOLUTION: A rotor is used for a starting motor of a decelerating type starter, a plural number of lower layer coils and upper layer coils are stored in a slot formed on the outer periphery of an armature core 2, and a ring armature coil is constituted by electrically connecting an end part of each of the lower layer coils and an end part of each of the upper layer coils. Unbalance of the rotor is corrected by drilling a hole 20 by a drill 19 on a reinforcing ring 18 or a ring member to hold the lower layer side coil end parts and the upper layer side coil end parts or forming a removed part 22 by a cutter 21 and removing unbalance quantity from the reinforcing ring 18.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for correcting unbalance of a rotor used in a rotary electric machine such as a DC motor.

[0002]

2. Description of the Related Art The present applicant has proposed a rotor capable of higher rotation than a conventional rotor with a commutator by utilizing a part of an armature coil as a commutator (Japanese Patent Application No. 7-27).
9346). This rotor includes a coil side portion housed in a slot formed on the outer periphery of the armature core, and a pair of coils extending from both ends of the coil side portion along the end face of the armature core toward the smaller diameter side. A half-turn U-shaped coil consisting of an extended portion is formed, and the U-shaped coils are inserted into each slot one by one in the vertical direction, and the U-shaped coil on the inner peripheral side and the U-shaped coil on the outer peripheral side are formed. An armature coil is configured by electrically connecting the ends of the. Each coil extending portion of the upper U-shaped coil arranged on the front side or the rear side of the armature core is used as a commutator.

Since this rotor is much smaller and lighter than a conventional rotor with a commutator, it can be rotated at high speed, but the higher the speed of rotation, the greater the need for improving the weight balance of the rotor. Therefore, as a method of correcting the imbalance of the rotor, for example, a method of partially removing the outer peripheral portion of the armature core (see Japanese Utility Model Publication No. Sho 58-2141) or a resin or the like at the coil end portion of the armature coil is used. A method of adding lumps is known.

[0004]

However, in the compact and lightweight rotor of the prior application, it is impossible to secure a sufficient removed portion in the outer peripheral portion of the armature core. Therefore, the outer peripheral portion of the armature core is partially removed. It is difficult to apply the method of correcting the rotor imbalance. That is, when the above method is applied, the strength of the armature core is reduced due to the removal of the outer peripheral portion, which may cause problems such as the armature coil popping out of the slot or being displaced due to the centrifugal force during high-speed rotation. There is. Further, if the outer peripheral portion of the armature core is deleted, the magnetic flux passing through the inside of the armature core may be reduced, and the output of the rotor may be reduced.

On the other hand, in the method of correcting the unbalance of the rotor by adding a lump of resin or the like, it is difficult to provide a joining strength enough to withstand the centrifugal force at the time of high-speed rotation, and it is added to the rotor. It is highly possible that the lumps that have spilled will pop out due to centrifugal force. Thus, it is difficult to apply the conventional unbalance correction method to a small-sized rotor used for high-speed rotation. The present invention has been made based on the above circumstances, and an object thereof is to provide an unbalance correction method suitable for a rotor that is small and used for high-speed rotation.

[0006]

According to the first aspect of the present invention, the unbalance of the rotor is corrected by removing a part of the ring-shaped member attached to either one of the axial directions of the rotor. You can As a result, it is possible to obtain a high-performance, long-life rotor that has an excellent weight balance in the rotating direction and that can reduce the generation of noise and vibration even at high speed rotation. This method can be applied even when a small rotor cannot secure a sufficient removed portion on the outer peripheral portion of the armature core. Further, since it is not necessary to delete the armature core itself, there is no reduction in output due to reduction of magnetic flux. Further, since the ring-shaped member is attached to the rotor coaxially with the shaft, it is possible to sufficiently withstand the centrifugal force strength during high-speed rotation.

According to the second aspect of the invention, the collar holding the end of the upper coil extension is used as the ring-shaped member to correct the imbalance of the rotor without increasing the number of parts. be able to.

According to the invention of claim 3, a hole is provided on the inner peripheral side of the slot along the axial direction from the end surface of the armature core,
By disposing a correction member in this hole, the imbalance of the rotor can be corrected. As a result, it is possible to obtain a high-performance, long-life rotor that has an excellent weight balance in the rotating direction and that can reduce the generation of noise and vibration even at high speed rotation. According to this method, since the correction member can be added to the inside of the armature core, there is no fear that the added correction member will be scattered by the centrifugal force at the time of high-speed rotation, and it is possible to provide a rotor that can endure high-speed rotation. . Further, in the inventions of claims 1 and 2, since the ring-shaped member is attached, the total length of the armature core is increased. However, according to the method of the present invention, the correction member is disposed inside the armature core. Also, the total length of the armature core does not increase. Further, since the hole is formed on the inner peripheral side of the slot, the magnetic circuit of the armature coil is not damaged and there is almost no reduction in the magnetic flux that affects the output of the rotor, so that the reduction in output of the rotor can be prevented.

According to the fourth aspect of the invention, the unbalance of the rotor can be corrected by removing a part of the armature core on the inner peripheral side of the slot. As a result, it is possible to obtain a high-performance, long-life rotor that has an excellent weight balance in the rotating direction and that can reduce the generation of noise and vibration even at high speed rotation. According to this method, a part of the armature core is removed on the inner peripheral side of the slot. Therefore, similar to the method described in claim 3, the magnetic circuit of the armature coil is not damaged and the electric resistance is excellent. You can get a good rotor.
Further, according to the method of the present invention, it is not necessary to use the ring-shaped member described in claims 1 and 2 or the correction member described in claim 3, and high speed is achieved by using a removal processing means such as a drill or a cutter. , Can perform unbalance correction work with high efficiency.

[0010]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an exploded perspective view of a rotor. This embodiment is an example of a commutator type DC electric motor (starter starting motor in this embodiment) having a rotor whose balance is adjusted by the unbalance correction method of the present invention. Is very well known,
The description is omitted.

As shown in FIG. 11, the starter 1 has a planetary gear speed reducer 3 for reducing the rotation of the starter motor 2 in addition to the starter motor 2, and the rotation of the starter motor 2 is transmitted through the speed reducer 3. A pinion shaft 4, a pinion 6 fitted to the pinion shaft 4 via a helical spline 5, a rotation restricting means 7 for restricting rotation of the pinion 6 when the starting motor 2 is started, and an energizing circuit for the starting motor 2. And a magnetic switch (not shown) for opening and closing a motor contact (not shown) and driving the rotation restricting means 7. This starter 1
The size of the rotor 8 itself is reduced by rotating the rotor 8 (see FIG. 2) at high speed and decelerating by the speed reducer 3 to generate a required torque.

The rotor 8 of the starting motor 2 has a shaft 9,
The armature core 10 and the armature coil (described below) are used, and a part of the armature coil is used as a commutator. The armature core 10 is formed by laminating a plurality of thin steel plates punched into a disc shape by a press machine, and is formed on the outer circumference of the shaft 9 with serrations 9 a.
(See FIG. 1) and fixed. Armature core 1
In the outer peripheral portion of 0, a predetermined number of slots 10a are provided at regular intervals in the circumferential direction of the armature core 10 so as to be recessed along the axial direction.

The armature coil is composed of a plurality (for example, 25 pieces) of lower layer coils 11 and upper layer coils 12, and electrically connects the end portions of each lower layer coil 11 and the respective end portions of each upper layer coil 12. It constitutes an annular armature coil. The lower layer coil 11 is made of a material having excellent electrical conductivity (eg, copper), and the coil side portion 11a accommodated on the inner peripheral side of the slot 10a via the lower inner insulator 13 in the slot (see FIG. 1).
And a pair of coil extending portions 11b that are bent at substantially right angles from both ends of the coil side portion 11a and extend in the radial direction. The end portions of the coil extending portions 11b (hereinafter, referred to as lower layer side coil end portions 11c). Is further folded along the axial direction. However, the coil extending portions 11b and the end surface of the armature core 10 are insulated from each other by a pair of ring-shaped insulating plates 14 fitted to the shaft 9 (see FIG. 2).

Like the lower coil 11, the upper coil 12 is made of a material having excellent electrical conductivity (eg, copper), and is provided with the slot 10 through the upper insulator 15 in the slot (see FIG. 1).
A coil side portion 12a housed on the outer peripheral side of a and a pair of coil extending portions 12b that are bent at substantially right angles from both ends of the coil side portion 12a and extend in the radial direction, each coil extending portion 12b. End (hereinafter, upper layer side coil end 12
(c) is further bent along the axial direction.
However, a space between each lower layer side coil extending portion 11b and each upper layer side coil extending portion 12b is insulated by a pair of ring-shaped insulating plates 16 fitted to the outer circumference of each lower layer side coil end portion 11c. Insulating rings 17 are arranged on both outer sides of the lower layer side coil ends 11c and the upper layer side coil ends 12c, and a reinforcing ring 18 (a collar of the present invention) is attached from the outside of the insulating rings 17. Each coil end 1
Holds 1c and 12c (see FIG. 2).

The in-slot lower insulator 13 and the in-slot upper insulator 15 are obtained by cutting or punching a resin insulating film into a predetermined shape and then bending and shaping it into a U-shape (substantially U-shape). Alternatively, it can be obtained by molding a resin material into a predetermined shape. Ring-shaped insulating plate 14,
Reference numeral 16 is made of resin (for example, nylon or phenol resin) and is formed by cutting, punching, resin molding or the like. The insulating ring 17 is made of an electrically insulating thin-walled resin molding member, and each coil end 1
It is arranged outside 1c and 12c to insulate and hold the armature coil. The reinforcing ring 18 has a cylindrical portion 18a fitted to the outer peripheral surface of the shaft 9 and a collar portion 18b that holds the coil ends 11c and 12c between the cylindrical portion 18a and the cylindrical portion 18a.

Next, the process of assembling the armature coil will be described. First, the armature core 10 and the lower coil extension portion 11
In order to prevent a short-circuit failure between the armature core 10 and the b, a pair of ring-shaped insulating plates 14 are fitted to the shaft 9 from both sides of the armature core 10 and closely attached to both end surfaces of the armature core 10. continue,
After inserting the lower insulator 13 in the slot into each slot 10a of the armature core 10, each lower layer coil 11 is inserted into each slot 10a (however, the coil side portion 11a is inserted into the slot 10a). Only). Then, the pair of ring-shaped insulating plates 16 are fitted from both sides of the armature core 10 onto the outer circumferences of the lower layer side coil ends 11c and are inserted until they come into contact with the lower layer side coil extending portions 11b.

Subsequently, the in-slot upper-side insulator 15 is inserted into each slot 10a of the armature core 10 and arranged in the upper layer of the lower-layer side coil side portion 11a, and then the upper-layer coil 12 is inserted into the slot 10a. (However, only the coil side portion 12a is inserted into the slot 10a). Then, in a state where the lower layer side coil end portion 11c and the upper layer side coil end portion 12c are radially overlapped on both sides of the armature core 10, the axial end portions are electrically connected by welding or the like. . Then, in order to prevent the armature coil from protruding from the slot 10a and reduce the magnetic resistance, a pair of protrusions 10b protruding on the outer periphery of the armature core 10 are bent toward the slot 10a (see FIG. 3).

Subsequently, a pair of insulating rings 17 are inserted from both sides of the armature core 10 through the outer circumference of the shaft 9 until they come into contact with the tip surfaces of the coil ends 11c and 12c. Subsequently, the flatness is improved by pressing the outer end surface of the upper coil extension 12b, which is the commutator surface. Then, the reinforcing ring 18 is press-fitted onto the outer periphery of the shaft 9 to form the cylindrical portion 18
While inserting a between the lower layer side coil end 11c and the shaft 9, the collar 18b is fitted from the outside of the insulating ring 17 to hold each coil end 11c, 12c.
The insulating ring 17 may be attached to the reinforcing ring 18 in advance, and the insulating ring 17 may be attached simultaneously with the reinforcing ring 18.

Next, a method of correcting the imbalance of the rotor 8 obtained by the above steps will be described. However, the method of measuring the amount of unbalance of the rotor 8 and the method of calculating the amount of removal of the armature core 10 or the amount of additional member for correction are well known, so description thereof will be omitted. (First Embodiment) In this embodiment, as shown in FIG. 4, at least one of the reinforcing rings 18 attached to the rotor 8 is bored with a drill 19 to form a hole 20, or a cutter 21 is used to remove a portion 22. Is formed to remove the unbalanced amount from the reinforcing ring 18 to correct the unbalanced state of the rotor 8. In the armature coil assembling process described above, the example in which the reinforcing ring 18 is attached last is shown, but the reinforcing ring 18 may not be used in some cases. In this case, as shown in FIG. 5, the ring-shaped member 23 is attached to at least one of the front side and the rear side of the armature core 10 coaxially with the shaft 9 and a part of the ring-shaped member 23 is removed. The imbalance can be corrected by.

(Second Embodiment) In this embodiment, a plurality of through holes 24 are provided in the circumferential direction on the inner peripheral side of the slot 10a of the armature core 10 along the axial direction. This through hole 24
Is an armature core 10 as shown in FIGS.
The same holes 24a and 24b are preliminarily formed on the inner peripheral side of the slots 10a of the respective steel plates 10A constituting the above, and when a plurality of the respective steel plates 10A are laminated and fitted and fixed to the shaft 9, the respective steel plates 10A are pierced. The through holes 24 can be formed by overlapping the formed holes 24a and 24b (see FIG. 7). Next, after assembling the armature coil to the armature core 10 through each of the above-described steps, as shown in FIG. 8, a correction member 25 (for example, resin) of an amount necessary for correcting the imbalance is discharged by the discharge nozzle 26. The imbalance of the rotor 8 can be corrected by discharging the correction member 25 discharged into the through hole 24 and curing the discharged correction member 25.

(Third Embodiment) In this embodiment, before attaching the reinforcing ring 18 to each coil end portion 11c, 12c, as shown in FIG.
As shown in FIG. 3, a hole 27 is formed in the both end faces of the armature core 10 (either one end face may be right) by the drill 19 from the axial direction.
This is a method of correcting the imbalance of the rotor 8 by removing the amount necessary for correcting the imbalance.
Even after the reinforcing rings 18 are attached to the coil ends 11c and 12c, as shown in FIG. 10, the upper layer side coil extending portion 12b and the lower layer side coil extending portion 11b are not drilled in a space portion where they do not overlap each other. To correct the unbalance of the rotor 8 by making holes 28 or 29 with 19 or the like and performing a removal process to reach the armature core 10 as necessary to remove an amount necessary for correcting the unbalance. You can also

(Effects of Embodiment) In the unbalance correction method of the first embodiment, the reinforcing ring 18 or the ring-shaped member 2 is used.
Since it is a method of removing a part of No. 3, it can be applied even when the small rotor 8 cannot secure a sufficient removed portion on the outer peripheral portion of the armature core 10. Further, since it is not necessary to delete the armature core 10 itself, the output is not reduced due to the reduction of the magnetic flux. Further, even when the ring-shaped member 23 is used, since the ring-shaped member 23 is attached to the rotor 8 coaxially with the shaft 9, it is possible to sufficiently withstand the centrifugal force strength during high-speed rotation.

According to the unbalance correction method of the second embodiment, since the correction member 25 can be added inside the through hole 24 provided in the armature core 10, the correction added by the centrifugal force during high speed rotation. It is possible to provide the rotor 8 that can withstand high speed rotation without the risk of the member 25 scattering. Also,
The through hole 2 is provided on the inner peripheral side of the slot 10a of the armature core 10.
4 is opened, the magnetic circuit of the armature coil is not damaged, and the magnetic flux that affects the output of the rotor 8 is hardly reduced. Therefore, the output reduction of the rotor 8 can be prevented.

According to the unbalance correction method of the third embodiment, since the inner peripheral side of the slot 10a of the armature core 10 is perforated, the magnetic field of the armature coil is changed as in the second embodiment. An excellent rotor 8 having a low electric resistance can be obtained without damaging the circuit. In addition, in the method of this embodiment, the ring-shaped member 23 is attached and the correction member 2 is used.
Since it is not necessary to add 5 and only a part of the armature core 10 needs to be removed, the removal processing means such as the drill 19 and the cutter 21 can be used to perform the imbalance correction work at high speed and with high efficiency.

By correcting the imbalance of the rotor 8 by the method shown in each of the above-mentioned embodiments, the weight balance in the rotating direction is excellent, and the generation of abnormal noise and vibration can be reduced even during high speed rotation. The rotor 8 can be obtained.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a rotor.

FIG. 2 is a half sectional view of a rotor.

FIG. 3 is a sectional view of an armature coil housed in a slot.

FIG. 4 is a perspective view of a main part of a rotor showing a removing method using a drill or a cutter.

FIG. 5 is a half sectional view of a rotor (first embodiment).

FIG. 6 is a plan view of a steel plate forming an armature core (second embodiment).

FIG. 7 is a half sectional view of an armature core (second embodiment).

FIG. 8 is a half sectional view of a rotor (second embodiment).

FIG. 9 is a half sectional view of a rotor (third embodiment).

FIG. 10 is a semi-front view of a rotor (third embodiment).

FIG. 11 is a partial cross-sectional view of the starter.

[Explanation of symbols]

 2 Starter motor (rotary electric machine) 3 Planetary gear speed reducer (reduction means) 8 Rotor 9 Shaft 10 Armature core 10a Slot 11a Lower layer coil side (armature coil) 11b Lower layer coil extension (armature coil) 12a Upper layer Coil side part (armature coil) 12b Upper layer coil extension part (armature coil) 18 Reinforcement ring (color) 23 Ring-shaped member 24 Through hole (hole along axial direction) 25 Correction member

Claims (4)

[Claims] 1. A rotating electric machine comprising a speed reducing means for reducing the rotation of a rotor, wherein the rotor has a shaft rotatably supported, and an electric machine fixed to the shaft and having a large number of slots on its outer circumference. A child core, a lower coil side portion and an upper coil side portion which are respectively housed in upper and lower two layers in each slot, and extend in the radial direction from both ends of the lower coil side portion along the end face of the armature core. A pair of lower layer coil extending portions, and a pair of upper layer coil extending portions extending from the both ends of the upper layer coil side portion outside the lower layer coil extending portion in the radial direction. And an armature coil in which the end portions of the upper layer coil extending portion are electrically connected to each other and the upper layer coil extending portion disposed at least on one side in the axial direction is provided as a commutator. The axis of the armature core An unbalance of the rotor characterized in that a ring-shaped member coaxial with the shaft is attached to one of the two directions, and a part of the ring-shaped member is removed to correct the unbalance of the rotor. Balance correction method. 2. The unbalance correction of a rotor according to claim 1, wherein the ring-shaped member is a collar that holds an end of the upper coil extension in at least one of the axial directions. Method. 3. A rotary electric machine comprising: the rotor according to claim 1; and a speed reducing means for reducing the speed of rotation of the rotor, wherein an inner peripheral side of the slot extends axially from an end surface of the armature core. An unbalance correction method for a rotor, characterized in that the unbalance of the rotor is corrected by providing a hole and providing a correction member for correcting the unbalance in the hole. 4. A rotary electric machine comprising: the rotor according to claim 1; and a speed reducing means for reducing the speed of rotation of the rotor, wherein a part of the armature core is removed on an inner peripheral side of the slot. An unbalance correction method for a rotor, comprising: