JP2010148294A - Rotor of electric motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotor of an electric motor which attaches a member of hollow structure having apertures to an armature core, and injects a balance weight into a required portion of the hollow structure. <P>SOLUTION: An armature wedge 9 holding an armature coil 4 in each slot 11 formed in the armature core 3 includes a hollow structure with apertures at the opposite ends thereof and the hollow 9 inside. The balance of the rotor is corrected by inserting a balance weight 10 of a material such as putty which solidifies when heat is applied into a required portion of the hollow structure. Consequently, the balance weight is prevented from scattering during high-speed rotation. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a rotor of an electric motor that is rotated at a high speed, such as for an electric blower.

  Generally, an electric motor used for an electric blower of a vacuum cleaner is rotated at a high speed. Therefore, in an electric motor of the type in which the armature winding of the rotor is held in a slot formed in the armature core, the armature wedge is firmly placed in the slot so that the armature winding is not deformed by centrifugal force. It is necessary to hold the rotor, and the rotor imbalance causes a vibration failure of the electric motor, which affects the life of the bearing and the brush.

  For this reason, the balance of the rotor is corrected so as not to generate vibration during rotation. However, since the number of rotations is high in the case of an electric vacuum cleaner motor, the coil end of the armature winding used in a small commutator electric motor is not suitable. The balance correction by putty adhesion cannot be adopted because it is scattered by centrifugal force, and is performed by cutting the armature core surface. As another balance correction method, there is a method in which a balance weight is directly placed in a slot.

  In a motor having a permanent magnet in the rotor, a permanent magnet holding plate made of synthetic resin is fixed to the rotating shaft by thermal welding, and a hole, a concave portion or a convex portion provided on the end surface of the permanent magnet holding plate is used as a reference position. It is known that the outer peripheral surface cutting center position is determined, the outer peripheral surface of the rotor iron core and the permanent magnet holding plate is cut, and the balance adjustment of the rotor is automated (see, for example, Patent Document 1).

  In addition, conventionally, for adjusting the balance of the rotor, end plates were provided on both end faces of the laminated core, and correction holes were machined on the outer periphery of the end plates, so the configuration was extremely complicated. In order to improve, the rotor of the electric motor has a plurality of permanent magnets inserted at predetermined positions of the laminated core part, and the balance putty is fixed by using the stepped parts formed at the axial ends of the permanent magnet and the laminated core part. In addition, it is also known that the balance is corrected and the permanent magnet is prevented from coming off with a very simple configuration (for example, see Patent Document 2).

JP 2002-142392 A JP-A-11-289699

  In this way, in the case of electric motors for electric vacuum cleaners, the number of revolutions is high, so the balance correction by putty bonding of the coil end of the armature winding used in small commutator motors is adopted because it is scattered by centrifugal force However, it was performed by cutting the armature core surface, but when the armature core surface was cut for balance correction, the air gap was increased, causing changes in characteristics and deterioration of efficiency. Further, in the method of directly inserting the balance weight into the slot, it is necessary to insert the balance weight before the varnish processing for secure fixing, and it is not possible to cope with the occurrence of unbalance due to the varnish processing. In view of this, the present invention has a structure in which a hollow structure member having an opening is attached to an armature core so that a balance weight can be injected into a necessary portion of the hollow structure, and the balance weight can withstand centrifugal force during operation. An object of the present invention is to provide a rotor for an electric motor.

  In order to solve the above-described problems, a rotor of an electric motor according to claim 1 of the present invention is configured to fix an armature core and a commutator to a shaft and bend a plurality of armature coils wound around the armature core. In a motor rotor having a structure connected to a plurality of segments arranged in a cylindrical shape of the commutator, a hollow structure member having an opening is attached to the armature core, and putty is put on a required portion of the hollow structure. The balance weight can be injected, and the balance weight can withstand the centrifugal force during operation.

  According to a second aspect of the present invention, there is provided a rotor for an electric motor in which an armature core and a commutator are fixed to a shaft, and a plurality of armature coils wound around the armature core are bent to form a cylindrical shape of the commutator. In a rotor of an electric motor having a structure connected to a plurality of segments arranged in a hollow structure in which an armature wedge that holds an armature coil in a slot formed in an armature core is provided with openings at both ends, A balance weight such as putty can be injected into a required portion of the hollow structure, and the balance weight can withstand the centrifugal force during operation.

  In this way, a hollow structure member having an opening is attached to the armature core, and a balance weight of a material such as a putty that solidifies by applying heat to the necessary portion of the hollow structure is injected, and in particular, the balance is balanced inside the wedge. By holding the weight, it is possible to prevent the balance weight from being scattered during high-speed rotation.

  According to a third aspect of the present invention, there is provided a rotor for an electric motor in which an armature core and a commutator are fixed to a shaft, and a plurality of armature coils wound around the armature core are bent to form a cylindrical shape of the commutator. In the rotor of the electric motor having a structure connected to a plurality of segments arranged in a hollow structure in which an armature wedge holding an armature coil in a slot formed in the armature core is provided with openings at both ends, and A structure in which a partition is provided in the middle of the hollow structure to form a two-part structure, and balance weight such as putty can be injected into a necessary portion of the two-part hollow structure, and the balance weight can withstand centrifugal force during operation It was.

  Thus, the armature wedge has a hollow structure with openings at both ends, and a partition is provided in the middle of the hollow structure to form a two-part structure, and heat is applied to a necessary portion of the two-part hollow structure to solidify. The balance can be corrected more accurately by injecting a balance weight of the material such as putty.

  According to a fourth aspect of the present invention, there is provided a rotor for an electric motor in which an armature core and a commutator are fixed to a shaft, and a plurality of armature coils wound around the armature core are bent to form a cylindrical shape of the commutator. In the rotor of the motor having a structure connected to a plurality of segments arranged in the armature, the armature wedge is provided to hold the armature coil in the slot formed in the armature core, and the grooved ring is integrated with the armature wedge. Are attached to both ends of the armature wedge so that a balance weight such as a putty can be attached to a predetermined position of the groove portion, and the balance weight can withstand centrifugal force during operation.

  According to a fifth aspect of the present invention, there is provided a rotor for an electric motor in which an armature core and a commutator are fixed to a shaft, and a plurality of armature coils wound around the armature core are bent to form a cylindrical shape of the commutator. In the rotor of the motor having a structure connected to a plurality of segments arranged in the armature, the armature wedge is provided to hold the armature coil in the slot formed in the armature core, and the grooved ring is integrated with the armature wedge. Are attached to both ends of the armature wedge, and the grooved ring is formed in a U-shaped body opened in the axial direction of the armature core, and a balance weight such as a putty is attached to a predetermined position of the groove portion. The balance weight can withstand the centrifugal force during operation.

  Thus, by injecting a balance weight of a material such as a putty that solidifies by applying heat to a required portion in the grooved ring formed in the U-shaped body opened in the axial direction of the armature core, The balance weight can be held, and the balance weight can be prevented from scattering during high-speed rotation.

  As described above, the rotor of the electric motor of the present invention has a balance weight of a material such as a putty that is solidified by attaching a member having a hollow structure to the armature core and applying heat to a necessary portion of the hollow structure. In particular, when the armature wedge has a hollow structure with openings at both ends, it is possible to prevent the balance weight from being scattered during high-speed rotation by holding the balance weight inside the wedge. it can. Further, in the case where a grooved ring integrated with the armature wedge is attached to both ends of the armature wedge, the balance weight can be prevented from scattering during high-speed rotation by holding the balance weight in the grooved ring.

  And since the balance can be corrected at the end of the rotor production process, it is possible to correct the balance with high accuracy, and the increase in motor input, characteristic variation, and efficiency that occur when the balance is corrected by conventional armature core surface cutting. Decline can be prevented.

  An embodiment of a rotor of an electric motor of the present invention will be described with reference to the drawings. 1, 2, and 3 are the first embodiment of the present invention, and FIGS. 4, 5, and 6 are the second embodiment of the present invention.

  Next, a first embodiment of the rotor of the electric motor of the present invention will be described. FIG. 1 is a partially broken sectional view of a rotor of the present invention, FIG. 2 is a sectional view of an armature wedge of the present invention, and FIG. 3 is a transverse sectional view of the armature of the present invention.

  In the figure, 1 is a rotor of an electric motor, 2 is a rotor shaft, 3 is an armature core, 4 is an armature coil, 5 is a commutator, 6 is a segment of the commutator, and 7 is a segment connecting the armature coil and the segment. Riser, 8 is an armature wedge, 9 is a hollow portion of the wedge, 10 is a balance weight injected into the hollow portion, 11 is a slot for inserting an armature coil formed in the armature core, and 12 is an intermediate portion of the hollow portion It is the partition provided in.

  When manufacturing a rotor of an electric motor, first, a large number of armature coils 4 are inserted into a plurality of slots 11 formed in an armature core 3 fixed to the rotor shaft 2 and wound. The armature coil 4 inserted into each slot 11 is pushed in by inserting an armature wedge 9 into the slot 11 as shown in FIG. . Both end portions of the plurality of armature coils 4 are fixed to the rotor shaft 2 and connected to risers 7 of the respective segments 6 arranged in a cylindrical shape of the commutator 5 having a smaller diameter than the armature core 3.

  As shown in FIGS. 2A and 2B, the armature wedge 9 that holds the armature coil 4 in each slot 11 formed in the armature core 3 has openings at both ends and has a hollow 9 inside. It has a hollow structure. FIG. 2A shows the hollow 9 penetrating to both ends, and FIG. 2B shows the two-part structure in which the partition 12 is provided in the middle of the hollow structure of the armature wedge 9. . And the balance weight 10 can be inserted in the required part of these hollow structures, and the balance of a rotor can be corrected. As the balance weight 10, a material such as a putty that solidifies when heat is applied can be used. Thereby, scattering of the balance weight at the time of high speed rotation is prevented.

  The balance is corrected by rotating the manufactured rotor 1 and detecting which part of the weight is offset by a balance detector, and the material of the balance weight 10 in the hollow 9 of the armature wedge 8 at that part. And solidify by applying heat. The amount and position of the balance weight in the hollow 9 of the armature wedge 8 can be determined by monitoring with a balance detector. In the embodiment of FIG. 3, the balance weight 10 is inserted into the hollows 9 of the six armature wedges 8.

  In this case, if the hollow 9 in FIG. 2A penetrates to both ends, the position of the balance weight 10 can be selected as a predetermined hollow position. FIG. 2B shows a two-part structure in which a partition 12 is provided in the middle of the hollow structure of the armature wedge 9, and a balance weight material is injected into the entire half of the hollow 9 as shown in FIG. It is also possible to inject only a part of it by monitoring with a balance detector.

  Next, a second embodiment of the rotor of the electric motor of the present invention is shown in FIG. 4, FIG. 5, and FIG. In the figure, the same components as those in FIGS. 1, 2, and 3 are denoted by the same reference numerals. 4 is a partial wave cross-sectional view of the rotor of the present invention, FIG. 5 is a cross-sectional view of a grooved ring integrated with the armature wedge of the present invention, and FIG. 6 is a side view of the armature end of the present invention. .

  In the figure, 1 is a rotor of an electric motor, 2 is a rotor shaft, 3 is an armature core, 4 is an armature coil, 5 is a commutator, 6 is a segment of the commutator, and 7 is a segment connecting the armature coil and the segment. A riser 8 is a normal armature wedge, and 13 is a grooved ring integrated with the armature wedge 8, and is attached to both ends of the armature wedge 8. FIG. 5 shows a mounting state at one end thereof. As shown in FIG. 6, the grooved ring 13 is formed in a U-shaped body opened in the axial direction of the armature core.

  A balance weight 10 is injected into a predetermined position of the groove portion of the grooved ring 13. Since the grooved ring 13 is formed in a U-shaped body opened in the axial direction of the armature core, injection from the outside becomes easy. As the balance weight 10, a material such as a putty that solidifies when heat is applied can be used. Thereby, scattering of the balance weight at the time of high speed rotation is prevented.

  When manufacturing a rotor of an electric motor, first, a large number of armature coils 4 are inserted into a slot formed in an armature core 3 fixed to the rotor shaft 2 and wound. The armature coil 4 inserted into each slot is pushed in by inserting a normal armature wedge 8 into the slot so as not to jump out of the slot due to centrifugal force during high-speed rotation. Both end portions of the plurality of armature coils 4 are fixed to the rotor shaft 2 and connected to risers 7 of the respective segments 6 arranged in a cylindrical shape of the commutator 5 having a smaller diameter than the armature core 3.

  The balance is corrected by detecting which part of the rotor is offset by the balance detector while rotating the manufactured rotor 1 and balancing the groove at a predetermined position of the grooved ring 13 of that part. The material of the weight 10 is poured and solidified by applying heat. It can be determined by monitoring with a balance detector which balance weight is injected into any of the right and left grooved rings 13 of the armature wedge 8 and the amount and position thereof. 5 and 6 show a state in which the balance weight 10 is inserted in a part of the groove portion. Thereby, the balance of the rotor can be corrected.

  Thus, since the present invention can perform balance correction at the end of the rotor production process, it becomes possible to perform accurate balance correction, and increase in motor input that occurs when balance is corrected by conventional armature core surface cutting, Variations in characteristics and reduction in efficiency can be prevented.

1 is a partially broken sectional view of a rotor according to a first embodiment of the present invention. Sectional drawing of the armature wedge of this invention. The cross-sectional view of the armature of the present invention. The partial wave sectional drawing of the rotor of the 2nd Embodiment of this invention. Sectional drawing of the ring with a groove | channel of integral structure with an armature wedge. The side view of the armature edge part of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rotor of motor 2 Rotor shaft 3 Armature core 4 Armature coil 5 Commutator 6 Commutator segment 7 Riser 8 Armature wedge 9 Wedge hollow portion 10 Balance weight 11 Slot 12 Partition 13 Grooved ring

Claims (5)

An electric motor having a structure in which an armature core and a commutator are fixed to a shaft, and a plurality of armature coils wound around the armature core are bent and connected to a plurality of segments arranged in a cylindrical shape of the commutator. In the rotor, a hollow structure member having an opening is attached to the armature core so that a balance weight such as putty can be injected into a necessary portion of the hollow structure, and the balance weight can withstand the centrifugal force during operation. An electric motor rotor characterized by having a structure. An electric motor having a structure in which an armature core and a commutator are fixed to a shaft, and a plurality of armature coils wound around the armature core are bent and connected to a plurality of segments arranged in a cylindrical shape of the commutator. In the rotor, the armature wedge that holds the armature coil in the slot formed in the armature core has a hollow structure with openings at both ends, and a balance weight such as putty is injected into a necessary portion of the hollow structure. An electric motor rotor characterized in that the balance weight is constructed to withstand centrifugal force during operation. 3. The electric motor rotor according to claim 2, wherein a partition is provided in the middle of the hollow structure of the armature wedge to form a two-part structure. An electric motor having a structure in which an armature core and a commutator are fixed to a shaft, and a plurality of armature coils wound around the armature core are bent and connected to a plurality of segments arranged in a cylindrical shape of the commutator. In the rotor, an armature wedge is provided to hold an armature coil in a slot formed in the armature core, and a grooved ring integrated with the armature wedge is attached to both ends of the armature wedge, and a predetermined portion of the groove portion is provided. A rotor of an electric motor characterized in that a balance weight such as a putty can be attached to the position of the balance and the balance weight can withstand centrifugal force during operation. The rotor of an electric motor according to claim 4, wherein the grooved ring is a U-shaped body opened in an axial direction of the armature core.

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