KR19990025719A - Brush holder and terminal fastening structure of commutator motor - Google Patents

Abstract

The present invention relates to a brush holder and a terminal fastening structure of a commutator motor, and provides a terminal contact means having an increased contact area on a rear side of a brush holder into which a carbon brush is inserted, and a terminal for connecting a coil and a lead wire to the terminal contact means. As the fastening means provided in the terminal is fastened to a wide contact area, the brush terminal is firmly fastened to the rear of the brush holder, thereby preventing the flow of the brush terminal due to vibration generated when the motor is driven. The air gap is kept constant, in particular, the pressure of the compression spring is kept uniform, thereby increasing the reliability of the motor.

Description

Brush holder and terminal fastening structure of commutator motor.

The present invention relates to a brush holder and a terminal fastening structure of the commutator motor, and more particularly, to prevent the flow of the brush holder and the brush terminal fastened by the vibration generated during the initial start and high speed operation of the motor to improve the performance of the motor. The present invention relates to a brush holder and a terminal fastening structure of a commutator motor which can be maintained uniformly.

In general, a commutator motor applied to a home appliance such as a mixer or a cleaner is a commutator that is rotated by changing a rotational direction of a rotor placed at right angles to the effective magnetic flux direction and a current flow direction in a magnetic field generated from a stator with a coil wound. And carbon brushes.

1 is a view showing a motor applied to a conventional cleaner, the commutator motor is a single-phase two-pole stator 12 and the rotor 14 is rotatably inserted into the stator 12 wound around the stator 12 And a pair of carbon brushes 18 and a rotor 14 fixed in a horizontal line with respect to the commutator 16 and a commutator 16 positioned below the commutator to change the direction of the current flowing toward the commutator 16. And a pair of housings 22 to which the motor cover 20 is mounted to protect and support the commutator 16.

In the upper housing 22, an impeller 24 coupled to one end of the rotor shaft 14a is built in to suck outside air, and a fan having a bearing 26 interposed outside the impeller 24. The guide 28 is mounted. And, the circumferential side of the lower housing 22 is formed so that the rectangular fitting hole (22a) and the screw hole (22b) in which the fixing screw 30 is tightened on one side thereof.

A guide holder 34 including a brush holder 32 into which a carbon brush 18 is inserted is inserted into the fitting hole 22a, and a through hole 34a is formed through one side of the guide holder 34 to allow the fixing screw 30 to pass therethrough. ) Is formed, and the fixing piece 36 is integrally formed on the rear side of the brush holder 32 so as to have the insertion groove 36a open at one side in the vertical direction as shown in FIG. 2. The carbon brushes 18 are spaced apart from each other on the horizontal line 180 ° to form an air gap with a predetermined gap with respect to the commutator 16.

The brush holder 32 has a U-shaped brush terminal 38 having a wing portion 38a to be inserted into the insertion groove 36a, and is connected to the carbon brush 18 on the inner and outer surfaces of the brush terminal 38. The other end of the lead wire 40 and the coil 10 are connected to each other by soldering, and a compression spring 42 is built in the brush holder 32 to maintain the air gap of the carbon brush 18.

In the conventional commutator motor configured as described above, as shown in FIG. 3, the housing 22 equipped with the motor cover 20 is combined to protect the rotor 14 and the commutator 16, and then the lower housing 22 is fitted. Insert the guide holder 34 into the hole 22a and coincide with the center of the screw hole 22b and the through hole 34a, and then tighten the fixing screw 30 with the brush holder 32 and the guide holder 34 including the same. ) On the horizontal line. At this time, the blade portion 38a of the brush terminal 38 connecting the lead wire 36 and the coil 10 is inserted into the insertion groove 36a formed in the brush holder 32, and at the same time, the fixing piece 36 is bent. The fastening of the brush terminal 38 is completed.

Then, when a current is applied to the coil 10 wound on the stator 12, the rotor 14 located in the direction of the effective magnetic flux and perpendicular to the magnetic field generated by the coil 10 is the Fleming's left hand law. The rotating commutator 16 and the commutator 16 pressed into the rotor shaft 14a change the positions of the commutator 16 and the carbon brush 18 as the rotor 14 is rotated to a right angle position. That is, the lead wire 40 connected to the coil 10 when the commutator 16 is rotated by 90 ° with respect to the pair of carbon brushes 18 fixed to the lower housing 22 on the horizontal line to change the position. Through the current applied to the carbon brush 18 is guided to the commutator 16 side according to Fleming's right hand law, the rotor 14 rotates without stopping.

Therefore, as the rotor 14 rotates according to the above driving principle, the outside air passes through the motor cover 20 by the high speed rotation of the impeller 24 coupled with the other end of the rotor shaft 14a, so that the impeller 24 is rotated. ) Is inhaled. The sucked air is again discharged from the impeller 24 and discharged into or out of the motor along the fan guide 28.

However, since the brush terminals for connecting the lead wires and the coils are fastened in both directions by bending the fixed pieces formed in the brush holders, the brush terminals are moved upward and downward due to vibration generated during initial startup or high speed rotation of the motor. As a result of the flow, the carbon brushes inserted into the brush holders could not be accurately positioned on the horizontal line (180 °), and thus the friction resistance between the commutator and the carbon brushes was increased, resulting in a poor flame.

The present invention is to solve the above problems, an object of the present invention is to securely fasten the brush terminal to the brush holder rear side of the commutator motor that can prevent the flow of the brush terminal by the vibration generated when driving the motor To provide a brush terminal and holder fastening structure.

Another object of the present invention is to prevent the flow of the brush terminal, while maintaining a constant air gap of the carbon brush to the commutator and at the same time maintain the pressure of the compression spring uniformly to increase the reliability of the motor brush terminal of the commutator motor and It is to provide a holder fastening structure.

1 is a partial cross-sectional view schematically showing a commutator motor according to the prior art,

FIG. 2 is an exploded perspective view illustrating a brush holder applied to the motor of FIG. 1 and a brush terminal fastened thereto; FIG.

3 is a perspective view showing a state in which a conventional brush holder and a brush terminal are fastened,

4 is an exploded perspective view showing a brush holder and a terminal fastening structure of the commutator motor according to the present invention;

5 is a perspective view illustrating a brush holder to which a brush terminal is fastened according to the present invention;

6 is a cross-sectional view of the cleaner motor shown in FIG. 5.

Explanation of symbols on the main parts of the drawings

60: brush holder 62: guide holder

64: base 66: close contact

66a: groove 68: flow preventing protrusion

70 brush terminal 72,74 first and second bent portion

74a: Key groove 76: Bending protrusion

Features of the present invention for achieving the above object, the upper and lower housings for protecting and supporting the commutator and the rotor is coupled, the lower housing is a brush holder in which a carbon brush is inserted spaced apart horizontally, In the brush terminal and holder fastening structure of the commutator motor for fastening the brush terminal connected with the brush holder, the lead wire and the coil, the brush holder has a terminal contact means for widening the range of the contact area in which the brush terminal is in close contact. The terminal contacting means is provided by the fastening means provided in the brush terminal in close contact and bent while being fastened.

Terminal contact means according to a preferred embodiment of the present invention is achieved by being provided with a support portion extending to the bottom of the brush holder and a contact piece having grooves on both sides of the brush holder to seat the brush terminal.

Fastening means according to a preferred embodiment of the present invention extends on both sides of the brush terminal, the first bent portion and the second bent portion having a key groove bent while being inserted into the groove of the close contact piece and the upper and lower sides of the brush terminal It is achieved by being provided with a bending protrusion which protrudes into each other and is bent while wrapping at least one of the close contact pieces among the close contact pieces.

Hereinafter, a preferred embodiment of the brush terminal and the holder fastening structure of the commutator motor according to the present invention will be described in detail with reference to the accompanying drawings.

Figure 4 is a view showing a brush terminal and holder fastening structure according to the present invention, so that the fitting hole 22a on the circumferential side of the housing 22 in order to protect and support the rotor 14 and the commutator 16 The guide holder 62 including the brush holder 60 is fitted into the fitting hole 22a. The brush holder 60 is inserted such that a pair of carbon brushes 18 having an air gap with respect to the commutator 16 are arranged on the horizontal line.

A terminal contact means is provided at the rear side of the brush holder 62 so that the brush terminal 70 for connecting the coil 12 and the lead wire 40 is in close contact with the contact area, and the brush terminal 70 is in close contact with the terminal contact means. At the same time, the fastening means is bent and is fastened, and the compression ring 42 is provided in the brush holder 60 and the brush terminal 70 to maintain a constant air gap between the carbon brush 18 and the commutator 16. It is imperative.

The terminal contact means is provided with a support portion 64 extending on the bottom surface of the brush holder 60 so that the bottom surface of the brush terminal 70 is seated, and an adhesion piece 66 having a recessed groove 66a on both sides. , The fastening means extends on both sides of the brush terminal 70 and has a first bent portion 72 and a second bent portion 74a which are bent while being inserted into the recess 66a of the close contact piece 66. Part 74 and a bent projection 76 protruding to one side of the upper and lower surfaces of the brush terminal 70 so as to be bent while wrapping at least one of the close contact piece 66 of the close contact piece 66 from the outside. do.

In addition, an upper surface of the brush holder 60 is provided with an anti-condenser (not shown) or an anti-flow projection 68 for preventing the brush terminal 70 from flowing upward.

The operation of the brush terminal and the holder fastening structure of the motor according to the present invention configured as described above will be described in detail with reference to FIGS. 5 and 6.

A brush terminal in which the lead wire 40 and the coil 10 are connected to insert the carbon brush 18 into the brush holder 60 and then apply current to the carbon brush 18 on the rear side of the brush holder 60. 70) Tighten. That is, the brush terminal 70 is in close contact with the contact piece 66 having an increased contact area while seating the bottom surface of the brush terminal 70 on the support 64 extended to the bottom of the brush holder 60. While bending, the first bent portion 72 is inserted into the groove 66a of the close contact piece 66 and bent to the key groove 74a of the second bent portion 74 and the other side of the brush holder 60. The second bent portion 74 is bent and fastened while being inserted into the recess 66a of the extended contact piece 66.

At this time, by bending the flow preventing protrusion 68 protruding from the upper surface of the brush holder 60 to the outer surface of the brush terminal 70, the brush terminal 70 by vibration generated during the initial starting and / or high speed rotation of the motor. This can be prevented from flowing upwards or by attaching a separate capacitor to prevent noise.

Thereafter, when the brush holder 60 to which the brush terminal 70 is fastened is attached to the guide holder 62 and then inserted into the fitting hole 22a formed on the circumferential side of the lower housing 22, the lower housing 22 The through hole 34a coinciding with the screw hole 22b of the screw hole 22b while passing through the fixing screw 30 to fix the brush holder 60 on the horizontal line with respect to the commutator 16.

When the current is applied to the coil 10 in the state of assembling completed as described above, in the magnetic field generated in the coil 10, the rotor 14 located at right angle to the effective magnetic flux direction and the left hand law of Fleming It rotates while being started according to, the commutator 16 is rotated by 90 ° with respect to the carbon brush 18, the impeller 24 coupled with the other end of the rotor shaft 14a while the flow direction of the current is changed As it is rotated at a high speed, the outside air is discharged into or out of the motor along the fan guide 28.

As described above, according to the brush terminal and the holder fastening structure of the commutator motor according to the present invention, by firmly fastening the brush terminal to the back of the brush holder, the flow of the brush terminal by vibration generated when the motor is driven, of course, Accordingly, the air gap of the carbon brush with respect to the commutator is kept constant, in particular, the pressure of the compression spring is kept uniform, thereby increasing the reliability of the motor.

The present invention is not limited to the above-described specific preferred embodiments, and various modifications can be made by any person having ordinary skill in the art without departing from the gist of the present invention claimed in the claims. Of course, such changes will fall within the scope of the claims.

Claims (5)

The upper and lower housings for protecting and supporting the commutator and the rotor are coupled to each other, and the lower housing has a brush holder inserted with a carbon brush spaced apart from each other on a horizontal line, and fastens the brush terminal connected to the brush holder and the lead wire and the coil. In the brush terminal and holder fastening structure of the commutator motor for The brush holder is provided with a terminal contact means for widening the range of the contact area that the brush terminal is in close contact, and the terminal contact means is fastened by bending the fastening means provided in the brush terminal in close contact with the commutator Brush terminal and holder fastening structure of the motor. The brush terminal of claim 1, wherein the terminal contact means comprises a support part extending on the bottom surface of the brush holder and a contact piece having grooves on both sides of the brush holder for seating the brush terminal. And holder fastening structure. According to claim 1, The fastening means is formed on both sides of the brush terminal is inserted into the groove of the contact piece is bent while the first bent portion and the second bent portion having a key groove and the upper and lower sides of the brush terminal Brush terminal and holder fastening structure of the commutator motor, characterized in that each protrusion is provided with a bending protrusion that is bent while wrapping at least one of the close contact between the close contact pieces. The brush terminal and holder fastening structure of the commutator motor according to claim 1, wherein the brush holder is provided with a flow preventing protrusion on an upper surface of the brush holder to prevent the brush terminal fastened by the fastening means from flowing upward. . 5. The brush terminal and holder fastening structure of a commutator motor according to claim 4, wherein the flow preventing projection is used to attach a condenser to prevent noise.