WO2019012903A1

WO2019012903A1 - Electric motor, electric air blower, cleaner, and holder for electric motor

Info

Publication number: WO2019012903A1
Application number: PCT/JP2018/022651
Authority: WO
Inventors: 藤田　克敏
Original assignee: パナソニックＩｐマネジメント株式会社
Priority date: 2017-07-14
Filing date: 2018-06-14
Publication date: 2019-01-17
Also published as: JP2020156120A

Abstract

This electric motor (2) is provided with: a rotor (10); a shaft (30) fixed to the rotor (10); a commutator (40) mounted to the shaft (30); a brush (50) disposed so as to be capable of slidably contacting the commutator (40); and a torsion spring (60) which presses the brush (50) onto the commutator (40), wherein the torsion spring (60) is disposed such that a coil part (61), which is included in the torsion spring (60), has a winding axis substantially orthogonal to the longitudinal direction of the shaft (30).

Description

Electric motor, electric blower, cleaner and holder for electric motor

The present disclosure relates to an electric motor, an electric blower, a vacuum cleaner, and a holder for the electric motor, and in particular, an electric motor used for household electric appliances etc., an electric blower using the electric motor, a vacuum cleaner using the electric blower, and an electric motor Relates to a holder for a motor used in the

In the case of household vacuum cleaners, along with the realization of high efficiency along with the demand for energy saving in the world, the demand is also increasing for the improvement of the reliability of the cleaner body. In order to improve the reliability of the cleaner body, it is necessary to improve the reliability of the electric blower mounted on the cleaner body to extend the life of the electric blower. Since the life of the electric blower is directly linked to the life of the motor, it is necessary to extend the life of the motor in order to prolong the life of the electric blower.

In recent years, in order to extend the life of the motor, as a motor used for a household vacuum cleaner, a brush-less commutator motor, which has been conventionally used, is increasingly used to use a brushless motor that does not use a brush. ing. However, due to the structure of the brushless motor, electronic components for driving and a drive circuit are required, and the entire motor becomes expensive. Therefore, there is a strong demand for prolonging the service life of the vacuum cleaner by using a commutator motor with a brush instead of using a brushless motor.

The life of the brushed commutator motor corresponds to the wear time of the brush attached for powering the commutator. Therefore, in order to extend the life of the commutator motor with a brush, it is necessary to devise to reduce the wear of the brush as much as possible. The wear of the brush is governed by the spring pressure which presses the brush against the segments of the commutator. Generally, when the pressure of the spring pressing the brush against the segment of the commutator decreases, the contact between the brush and the commutator becomes unstable, and a commutating spark is generated between the brush and the commutator. It becomes easy to do. Therefore, for the purpose of stabilizing the pressure for pressing the brush against the segments of the commutator, recently, a motor employing a torsion spring rather than a coil spring has been proposed (Patent Document 1 etc.).

Hereinafter, a conventional commutator motor in which a brush is pressed against a commutator by a torsion spring will be described using FIGS. 10 and 11. FIG. 10 is a half sectional view of an electric blower 100 incorporating a conventional electric motor 200 using a torsion spring 260 as a brush spring. FIG. 11 is a view showing the arrangement position of the torsion spring 260 in the electric blower 100. As shown in FIG.

As shown in FIGS. 10 and 11, a conventional electric blower 100 includes an electric motor 200, a rotary fan 300 attached to a shaft 230 of the motor 200, and an air guide 400 for rectifying the air drawn by the rotary fan 300. Prepare. The motor 200 is held in a space surrounded by the first bracket 500a and the second bracket 500b. The air guide 400 is in contact with the first bracket 500a. The air guide 400 is located on the opposite side of the space where the electric motor 200 is held with respect to the first bracket 500a. The rotary fan 300 is located in the space surrounded by the air guide 400 and the fan case 300a. The outer housing 500 is formed by the second bracket 500b and the fan case 300a.

The motor 200 used for the electric blower 100 is a commutator motor with a brush, and the rotor 210, a stator 220 for rotating the rotor 210, and a rectifier mounted on the shaft 230 of the rotor 210. A brush 240, a brush 250 disposed slidably on the commutator 240, a torsion spring 260 pressing the brush 250 against the commutator 240, and a brush holder 270 holding the brush 250 are provided.

JP 2004-40957 A

However, in the conventional motor 200, as shown in FIG. 11, since the torsion spring 260 is disposed on the same plane as the commutator 240 and the brush 250, the working surface on which the arm portion 262a of the torsion spring 260 operates is It is flush with the commutator 240 and the brush 250.

Therefore, in the brush 250, the winding axis J is the rotation center on the operation plane where the force F1 that the brush 250 tends to move toward the shaft 230 and the arm portion 262a of the torsion spring 260 are orthogonal to the longitudinal direction of the shaft 230. As a force F that combines the force F2 acting in the direction of rotation is generated. Therefore, since the brush 250 receives the force F (pressing) in the diagonal direction from the torsion spring 260, the contact between the commutator 240 and the brush 250 becomes unstable or the brush 250 is inclined, so that the electric motor 200. The efficiency of the motor 200 is reduced, and the life of the motor 200 is shortened. The longitudinal direction of the shaft 230 is also referred to as the direction (axial direction) of the axial center C of the shaft 230.

Further, as shown in FIG. 11, when the torsion spring 260 is disposed on the same plane as the commutator 240 and the brush 250, the torsion spring 260 is disposed on the rotation fan 300 side of the rotor 210. As a result, the degree of freedom in the layout of the brush 250 and the brush holder 270 including the torsion spring 260 is reduced, and there is a problem that it is difficult to realize a small motor.

Moreover, when the torsion spring 260 is disposed on the rotary fan 300 side with respect to the rotor 210 in the longitudinal direction of the shaft 230, the path of the air sucked by the rotary fan 300 and flowing through the air guide 400 is the torsion spring 260, It will be closed by the brush 250 and the brush holder 270. Thus, this configuration leads to a reduction in the air output of the electric blower 100. That is, there is a problem that the efficiency of the motor 200 is reduced.

The present disclosure has been made to solve such a problem, and it is possible to suppress the reduction in efficiency and to reduce the efficiency even when a torsion spring is used as a brush spring for pressing the brush against the commutator. An object of the present invention is to provide a small-sized motor with a long life.

In order to achieve the above object, one aspect of an electric motor according to the present disclosure includes a rotor, a shaft fixed to the rotor, a commutator attached to the shaft, and a commutator slidably A pair of arms arranged to press the brush against the commutator, the coil, and a coil and a direction in which each of the coils has a twisting relationship with respect to a winding axis of the coil. And a torsion spring, and the torsion spring is disposed such that the winding axis is substantially orthogonal to the longitudinal direction of the shaft.

Moreover, one aspect of an electric blower according to the present disclosure includes the above-described electric motor, and a rotating fan attached to the shaft included in the electric motor.

Moreover, one aspect of the vacuum cleaner according to the present disclosure includes the above-described electric blower, and a control unit that controls the electric blower.

Further, one aspect of the motor holder according to the present disclosure is a motor holder for holding a torsion spring that biases a brush disposed slidably on a commutator attached to a shaft toward the commutator. A spring housing portion for housing the torsion spring, and an inner surface of the spring housing portion, wherein the winding axis of the coil portion of the torsion spring is substantially orthogonal to the longitudinal direction of the shaft And a locking claw to lock.

According to the present disclosure, even when a torsion spring is used as a brush spring for pressing a brush against a commutator, it is possible to suppress a decrease in efficiency and to realize a long-life, compact motor and the like.

FIG. 1 is an external perspective view of the electric blower according to the embodiment. FIG. 2 is a half sectional view of the electric blower according to the embodiment. FIG. 3 is a cross-sectional view of an essential part of the motor in the electric fan according to the embodiment. FIG. 4 is a view showing the configuration of the torsion spring before applying a load. FIG. 5A is a perspective view when the holder in the motor according to the embodiment is viewed from above. FIG. 5B is a perspective view when the holder in the motor according to the embodiment is viewed from below. FIG. 5C is a cross-sectional view of the holder in the motor according to the embodiment. FIG. 6 is a view for explaining a method of storing the torsion spring in the holder. FIG. 7 is a diagram showing the behavior of the torsion spring before and after the brush wear in the electric motor according to the embodiment. FIG. 8 is a schematic view showing an example of a vacuum cleaner using the electric blower according to the embodiment. FIG. 9 is a cross-sectional view of an essential part of a motor according to a modification. FIG. 10 is a half sectional view of an electric blower incorporating a conventional electric motor using a torsion spring as a brush spring. FIG. 11 is a view showing an arrangement position of a torsion spring in an electric fan in which a conventional electric motor is incorporated.

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. Each embodiment described below shows one specific example of the present disclosure. Therefore, numerical values, shapes, materials, components, arrangement positions of components, connection configurations, and the like shown in the following embodiments are merely examples, and are not intended to limit the present disclosure. Therefore, among the components in the following embodiments, components that are not described in the independent claims indicating the highest concept of the present disclosure are described as optional components.

Each drawing is a schematic view and is not necessarily strictly illustrated. Further, in the respective drawings, substantially the same configuration is given the same reference numeral, and overlapping description will be omitted or simplified.

Embodiment
The electric blower 1 according to the embodiment and the electric motor 2 used for the electric blower 1 will be described with reference to FIGS. 1 to 3. FIG. 1 is an external perspective view of the electric blower 1 according to the embodiment, FIG. 2 is a determination surface view of the electric blower 1, and FIG. 3 is a cross-sectional view of main parts of the motor 2 in the electric blower 1. It is. In FIG. 2, the arrow indicates the flow of air sucked by the rotation of the rotary fan 3. Further, in FIG. 3, the winding coil 12 and the stator 20 of the rotor 10 are not illustrated.

As shown in FIGS. 1 to 3, the electric blower 1 according to the present embodiment includes a motor 2 (motor), a rotary fan 3, an air guide 4, a first bracket 5, a second bracket 6, and a fan. A case 7 is provided.

The motor 2 rotates the rotary fan 3 as a rotation target (rotational load). The detailed configuration of the motor 2 will be described later.

The rotary fan 3 sucks air into an outer housing (housing) configured by the second bracket 6 and the fan case 7. The rotation fan 3 is attached to a predetermined portion of a shaft 30 of the motor 2 and rotates by the rotation of the shaft 30. In the present embodiment, the rotary fan 3 is attached to the tip of the shaft 30 protruding from the first bracket 5. As an example, the rotary fan 3 is a centrifugal fan, and sucks in air from the air inlet 7 a of the fan case 7.

The air guide 4 rectifies the flow of the gas (air) drawn from the air inlet 7a of the fan case 7 by the rotation of the rotary fan 3, and the drawn gas is smoothed to the space (second bracket 6) on the motor 2 side. Pour into As one example, the air guide 4 is formed in a ring shape and has a plurality of guide plates for rectifying the flow of gas.

The first bracket 5 covers the opening of the second bracket 6 together with the air guide 4. The first bracket 5 is disposed to cover the first bearing portion 81.

The second bracket 6 is a first housing for housing the motor 2. At the bottom of the second bracket 6 is formed an exhaust port for discharging the air sucked by the rotation of the rotary fan 3.

The fan case 7 is a second housing that houses the rotary fan 3. The fan case 7 is fixed to the second bracket 6 so as to cover the rotary fan 3, the air guide 4 and the first bracket 5. The fan case 7 has an air inlet 7a for suctioning the outside air.

Hereinafter, the detailed configuration of the motor 2 will be described. The motor 2 in the present embodiment is a brushed commutator motor, and includes the rotor 10, the stator 20, the shaft 30, the commutator 40, the brush 50, the torsion spring 60, and the holder 70. Prepare.

The rotor 10 (rotor) is rotated by the magnetic force of the stator 20. In the present embodiment, the rotor 10 is an inner rotor and is disposed inside the stator 20. Specifically, the rotor 10 is surrounded by the stator 20 via a minute air gap with the stator 20.

The rotor 10 is configured of, for example, a core 11 (rotor core) and a winding coil 12 (rotor coil) wound around each of a plurality of teeth of the core 11. The core 11 is formed of, for example, a laminated body in which electromagnetic steel sheets are laminated, but may be a bulk body of a magnetic material. The winding coil 12 wound around each tooth of the core 11 is electrically connected to each other via the commutator 40 and the brush 50.

The stator 20 (stator) generates a magnetic force acting on the rotor 10. In the present embodiment, the stator 20 is disposed to surround the rotor 10. The stator 20 is constituted by, for example, a permanent magnet having an S pole and an N pole, but may be constituted by an iron core (stator core) and a winding coil (stator coil). The stator 20 is fixed to, for example, the second bracket 6.

The shaft 30 is a rotation axis serving as a center when the rotor 10 rotates. The shaft 30 extends in the longitudinal direction which is the direction of the axial center C. The shaft 30 is formed of, for example, a metal rod. The shaft 30 is fixed to the rotor 10. Specifically, the shaft 30 is fixed to the core 11 in a state of penetrating the center of the core 11 of the rotor 10, for example. As an example, the shaft 30 is press-fit into the core 11 of the rotor 10.

The shaft 30 passes through the rotor 10 and is disposed to extend on both sides of the rotor 10. One end (the end on the rotary fan 3 side) of the shaft 30 is supported by the first bearing portion 81. On the other hand, the other end of the shaft 30 is supported by the second bearing portion 82. As an example, the first bearing 81 and the second bearing 82 are bearings that support the shaft 30. As described above, the shaft 30 is held by the first bearing 81 and the second bearing 82 so as to be rotatable.

One end of the shaft 30 protrudes from the first bearing portion 81 and penetrates the first bracket 5. A portion of the shaft 30 protruding from the first bracket 5 is a portion to which the rotation target is attached. In the present embodiment, the rotary fan 3 is attached to the tip end of a portion of the shaft 30 protruding from the first bracket 5 as a rotation target.

The commutator 40 is attached to the shaft 30. In the present embodiment, the commutator 40 is fixed to a portion of the shaft 30 between the rotor 10 and the second bearing portion 82. The commutator 40 is electrically connected to the winding coil 12 of the rotor 10 and is in sliding contact with the brush 50. The commutator 40 is constituted by a plurality of segments insulated and separated from each other in the rotational direction of the shaft 30.

The brush 50 is a power supply brush for supplying power to the rotor 10 by contacting the commutator 40. The brush 50 contacts the commutator 40 to supply armature current to the commutator 40. As an example, the brush 50 is a carbon brush. Moreover, the brush 50 is a long substantially rectangular parallelepiped.

The brush 50 is disposed slidably on the commutator 40. The pair of brushes 50 is provided, and the pair of brushes 50 are disposed to sandwich the commutator 40. Specifically, the inner front end portions of the pair of brushes 50 are in contact with the commutator 40. In the present embodiment, an end surface on the inner side (shaft 30 side) of the brush 50 in the longitudinal direction is a contact surface with the commutator 40.

Further, each of the pair of brushes 50 is disposed in the second bracket 6 in a state of being biased toward the commutator 40 by the torsion spring 60. That is, two torsion springs 60 are also provided. The end surface located in the longitudinal direction outside of each brush 50 is a contact surface with the torsion spring 60.

The torsion spring 60 is an elastic member that presses the brush 50 against the commutator 40. That is, the torsion spring 60 biases the brush 50 toward the commutator 40. Specifically, the torsion spring 60 applies a pressure (spring pressure) to the brush 50 by a spring elastic force (spring restoring force) caused by the application of a load, and presses the brush 50 against the commutator 40.

The torsion springs 60 are arranged according to the number of brushes 50. In the present embodiment, since two brushes 50 are disposed, two torsion springs 60 are also disposed. The two torsion springs 60 are disposed at opposing positions across the shaft 30.

Here, a specific configuration of the torsion spring 60 will be described with reference to FIG. FIG. 4 is a view showing the configuration of the torsion spring 60 before applying a load (before elastic deformation).

As shown in FIG. 4, the torsion spring 60 is made of a metal wire rod, and a pair of a coil portion 61 which is a wound portion of the metal wire rod and a portion which linearly extends from the coil portion 61 And the arm portion 62 of FIG. Two arms 62 extend in different directions from the coil 61. In other words, with respect to the winding axis J of the coil portion 61, the pair of arm portions 62 extend in the direction in which each of the arm portions 62 has a positional relationship of twist. Although the details will be described later, by applying a load to the arm portion 62 to deform the torsion spring 60, a spring elastic force by the arm portion 62 can be applied to the brush 50.

Further, a bent portion 62 a is formed at an end portion of a portion of the torsion spring 60 in contact with the brush 50. In the present embodiment, the bending portion 62 a is formed at the tip of the first arm portion 62 b which is one of the two arm portions 62. As an example, the bending part 62a is the shape which curved the front-end | tip part of the arm part 62 in circular arc shape. The bending portion 62 a may be formed in each of the two arm portions 62.

The torsion spring 60 presses the brush 50 against the commutator 40 by applying a pressure (spring pressure) to the end surface of the brush 50 located on the outer side in the longitudinal direction. Specifically, the torsion spring 60 applies a pressure to the brush 50 by the arm portion 62 by utilizing a spring elastic force by a repulsive force generated in a direction opposite to the winding direction of the coil portion 61.

The torsion spring 60 is disposed such that the winding axis J of the coil portion 61 is substantially orthogonal to the longitudinal direction of the shaft 30. That is, the torsion spring 60 is disposed in a posture of being placed vertically with respect to the longitudinal direction of the shaft 30, and the winding surface of the coil portion 61 (that is, the surface parallel to the two arm portions 62) is the longitudinal length of the shaft 30 It is arranged to be substantially parallel to the direction. In other words, the torsion spring 60 is disposed such that the winding axis J and the direction of the axial center C of the shaft 30 intersect.

Thus, the arm portion 62 of the torsion spring 60 moves in a plane including the longitudinal direction of the shaft 30. That is, the operating surface on which the arm portion 62 of the torsion spring 60 operates is a flat surface including the longitudinal direction of the shaft 30.

Further, in the present embodiment, the coil portion 61 of the torsion spring 60 and the brush 50 are disposed so as to overlap along the longitudinal direction of the shaft 30. That is, when viewed along the longitudinal direction of the shaft 30 from the second bearing portion 82 side, the coil portion 61 of the torsion spring 60 is hidden by the brush 50 and can not be seen.

Each of the two torsion springs 60 is held by the holder 70. The holder 70 is a spring holder that holds the torsion spring 60. In the present embodiment, the holder 70 is arranged in accordance with the arrangement position of the two torsion springs 60. Specifically, the two holders 70 are disposed at opposing positions across the shaft 30.

Here, the detailed configuration of the holder 70 will be described with reference to FIGS. 5A to 5B. 5A is a perspective view of the holder 70 as viewed from above, FIG. 5B is a perspective view of the holder 70 as viewed from below, and FIG. 5C is a cross-sectional view of the holder 70.

As shown in FIGS. 5A to 5C, the holder 70 includes a spring storage portion 71 (first storage portion) for storing the torsion spring 60, and a locking claw 72 for locking the coil portion 61 of the torsion spring 60. Have. The locking claw 72 locks the coil portion 61 such that the winding axis J of the coil portion 61 is substantially orthogonal to the longitudinal direction of the shaft 30. The holder 70 is an integral product of a resin molded product made of, for example, an insulating resin material. In addition, the material which comprises the holder 70 is not restricted to a resin material, and the holder 70 may be comprised by several components.

The spring accommodating portion 71 has an opening 71a and a bottom 71b at a position facing the opening 71a. The torsion spring 60 is inserted from the opening 71 a and accommodated in the spring accommodating portion 71. The bottom portion 71 b constitutes the bottom surface of the spring storage portion 71.

The locking claw 72 is formed on the inner surface of the spring storage portion 71. Specifically, the locking claw 72 is provided in the vicinity of the bottom portion 71 b of the spring storage portion 71. In addition, the locking claws 72 are provided on each of two opposing side surfaces of the spring storage portion 71. The coil portion 61 of the torsion spring 60 is sandwiched by the pair of locking claws 72.

The holder 70 also functions as a brush holder for holding the brush 50. The brush 50, the torsion spring 60 and the holder 70 are arranged in the motor 2 as a brush holder assembly.

Specifically, the holder 70 has a brush storage portion 73 (second storage portion) for storing the brush 50. The brush storage portion 73 is formed with an opening 73 a for inserting the brush 50 into the brush storage portion 73.

Further, as shown in FIGS. 2 and 3, a support plate 90 for supporting the brush 50 is attached to the holder 70. The brush 50 is housed in a space area formed between the brush housing portion 73 and the support plate 90. As described above, since the brush 50 is housed in the holder 70, the holder 70 and the brush 50 are disposed so as to overlap along the longitudinal direction of the shaft 30.

In the present embodiment, as shown in FIG. 2, the brush 50, the torsion spring 60 and the holder 70 (brush holder assembly) have the rotary fan 3 positioned relative to the rotor 10 in the longitudinal direction of the shaft 30. It is arranged on the opposite side to the side. Specifically, the brush 50, the torsion spring 60 and the holder 70 are disposed between the rotor 10 and the second bearing portion 82.

Here, a method of storing the torsion spring 60 in the holder 70 will be described with reference to FIG. FIG. 6 is a view for explaining a method of storing the torsion spring 60 in the holder 70. As shown in FIG.

First, as shown in (a) of FIG. 6, the torsion spring 60 is prepared, and then, as shown in (b) of FIG. 6, a load is applied to the arm 62 and the root of the arm 62 is used as an axis. The torsion spring 60 is elastically deformed by moving the arm portion 62 in the winding direction of the coil portion 61.

Instead of applying a load to move the arm portion 62 in the direction of winding in the coil portion 61, a load may be applied to move the arm portion 62 in the winding direction of the coil portion 61.

Next, as shown in FIG. 6C, the torsion spring 60 in an elastically deformed state is inserted from the opening 71a of the holder 70, and the torsion spring 60 is accommodated in the spring accommodating portion 71 of the holder 70. At this time, as shown in (d) of FIG. 6, the coil portion 61 is pushed into the back of the spring storage portion 71, and the locking claw 72 formed on the inner surface of the spring storage portion 71 is locked to the coil portion 61. .

Thereby, the torsion spring 60 can be accommodated in the holder 70 in a state in which the torsion spring 60 is elastically deformed. That is, the torsion spring 60 is held by the holder 70 in a state in which the arm portion 62 is loaded.

One arm portion 62 of the torsion spring 60 held by the holder 70 serves as a support arm, and is supported by the spring accommodating portion 71 in a state of being urged by the inner surface of the spring accommodating portion 71. In addition, the other arm portion 62 of the torsion spring 60 becomes a brush contact arm, and is in a state of protruding from the spring storage portion 71. As a result, by inserting the brush 50 into the holder 70, it is possible to apply a pressure to the brush 50 by the other arm portion 62 (brush contact arm) of the torsion spring 60.

As shown in FIG. 2, in the electric blower 1 configured as described above, when electric power is supplied to the motor 2, an armature current is applied to each winding coil 12 of the rotor 10 via the commutator 40 and the brush 50. Flow. As a result, torque is generated between the stator 20 and the rotor 10 to rotate the rotor 10. When the rotor 10 rotates, the rotating fan 3 rotates accordingly.

Then, when the rotary fan 3 is rotated, air is drawn into the fan case 7 from the air inlet 7 a of the fan case 7, and the air drawn into the fan case 7 is transferred to the outer peripheral portion of the fan case 7. The air is guided to form a swirling flow at the gap between the air guide 4 and the fan case 7, and is discharged from the exhaust port of the second bracket 6 to the outside of the electric blower 1.

At this time, as shown in (a) of FIG. 7, when the electric blower 1 (motor 2) is driven, the brush 50 is pressed against the commutator 40 by pressing with the torsion spring 60. An end face 50 b located on the inner side in the longitudinal direction of the brush 50 (right side in FIG. 7A) is in sliding contact with the commutator 40.

The end surface 50 b (contact surface with the commutator 40) on the inner side in the longitudinal direction of the brush 50 is worn away by continuing to be in sliding contact with the commutator 40 as the rotor 10 rotates. Furthermore, as shown in (b) of FIG. 7, the contact with the rotor 10 continues by the pressing by the torsion spring 60. That is, with the wear of the end surface 50b located inside in the longitudinal direction of the brush 50, the position of the end surface 50c located outside in the longitudinal direction of the brush 50 moves inward.

Next, the operation and effect of the electric blower 1 using the motor 2 according to the present embodiment will be described, including the background of the present disclosure.

As described above, in the conventional motor 200 shown in FIG. 11, the torsion spring 260 is disposed on the same plane as the commutator 240 and the brush 250. That is, the torsion spring 260 is disposed in a lateral attitude, and the winding axis J of the coil portion 261 of the torsion spring 260 is parallel to the longitudinal direction of the shaft 230 of the rotor 210.

Therefore, the plane on which the arm portion 262a of the torsion spring 260 operates is the same plane as the commutator 240 and the brush 250. That is, the arm portion 262a of the torsion spring 260 moves in a plane parallel to a plane whose normal direction is the longitudinal direction of the shaft 230.

Thereby, the torsion spring 260 presses the brush 250 in the direction in which the brush 250 is inclined toward the commutator 240 by the arm portion 262a. Therefore, the brush 250 receives an oblique pressure (force F) from the torsion spring 260.

As a result, since the contact between the commutator 240 and the brush 250 becomes unstable or the brush 250 is inclined, the motor 200 has a problem that the rotation direction of the rotor 210 is limited.

In particular, when the pressing direction of the torsion spring 260 and the rotation direction of the rotor 210 are opposite to each other, the contact between the commutator 240 and the brush 250 is likely to be unstable, and the brush 250 is easily inclined. As a result, the efficiency of the motor 200 is further reduced, and the life of the motor 200 is further shortened. For this reason, it is necessary to change the arrangement of the torsion spring 260 in accordance with the rotation direction of the rotor 210.

Further, as shown in FIG. 11, when the torsion spring 260 is disposed on the same plane as the commutator 240 and the brush 250, the space in the housing 500 when the brush 250, the torsion spring 260 and the brush holder 270 are disposed. In order to achieve this, the area including the sliding range of the brush 250 and the operating range of the arm portion 262a of the torsion spring 260 is required in a plane (horizontal plane) having the longitudinal direction of the shaft 230 as the normal.

For this reason, the torsion spring 260, the brush 250 and the brush holder 270 must be disposed on the rotary fan 300 side of the rotor 210 (that is, between the rotor 210 and the rotary fan 300). That is, the degree of freedom in the layout of the torsion spring 260, the brush 250 and the brush holder 270 is small. As a result, there is a problem that it is difficult to realize a small motor.

Moreover, when the torsion spring 260, the brush 250 and the brush holder 270 are disposed on the rotary fan 300 side of the rotor 210, the passage of air sucked by the rotary fan 300 and flowing through the air guide 400 is the torsion spring 260, brush It will be closed by 250 and the brush holder 270, and will lead to the fall of the air output of electric blower 100. That is, there is a problem that the efficiency of the motor 200 is reduced.

The present disclosure has been made based on such findings, and as a result of intensive studies by the present inventors, even if a torsion spring is used as a brush spring for pressing the brush against the commutator, the torsion spring is It has been found that by changing the posture of the arrangement of the above, it is possible to suppress the decrease in efficiency and to realize a long life and a small motor etc.

Specifically, as shown in FIG. 2 and FIG. 3, in the motor 2 according to the present embodiment, the torsion spring 60 pressing the brush 50 against the commutator 40 has a winding axis (J) of the coil portion 61 as a shaft It is disposed to be substantially orthogonal to the longitudinal direction of 30. That is, the torsion spring 60 is disposed in a posture of being placed vertically to the longitudinal direction of the shaft 30.

By this configuration, the arm portion 62 of the torsion spring 60 moves in a plane including the longitudinal direction of the shaft 30. That is, the operating surface on which the arm portion 62 of the torsion spring 60 operates is a flat surface including the longitudinal direction of the shaft 30.

Thus, the brush 50 does not receive the pressure in the oblique direction from the torsion spring 60 but receives the pressure in the longitudinal direction of the brush 50 from the torsion spring 60. Therefore, the contact between commutator 40 and brush 50 can be prevented from becoming unstable or brush 50 can be prevented from being inclined, so that motor 2 in the present embodiment is restricted in the rotational direction of rotor 10. Can be suppressed.

Moreover, the operating surface of the arm portion 62 of the torsion spring 60 is the same as the radial direction of the rotor 10. Therefore, the pressing direction of the torsion spring 60 does not depend on the rotation direction of the rotor 10. This eliminates the need to change the arrangement of the torsion springs 60 in accordance with the rotational direction of the rotor 10. That is, the degree of freedom in the layout of the torsion spring 60 is increased.

Further, the winding axis (J) of the coil portion 61 is disposed so as to be substantially orthogonal to the longitudinal direction of the shaft 30, the working surface of the arm portion 62 of the torsion spring 60, the commutator 40 and the brush 50 Is not parallel to the plane of. Thereby, as a space in the second bracket 6 at the time of arranging the brush 50, the torsion spring 60 and the holder 70, the sliding range of the brush 50 in the direction (radial direction) orthogonal to the longitudinal direction of the shaft 30 It is sufficient to secure only the area including the operation range of the arm portion 62 of the torsion spring 60 in the longitudinal direction (vertical direction) 30.

Therefore, the degree of freedom in layout of the torsion spring 60, the brush 50 and the holder 70 is increased, and the torsion spring 60, the brush 50 and the holder 70 do not have to be disposed on the rotary fan 3 side of the rotor 10. It becomes possible to arrange | position on the opposite side to the rotation fan 3 side of the rotor 10 like a form of this. Thereby, the small electric motor 2 can be easily realized.

Further, in the longitudinal direction of the shaft 30, the torsion spring 60, the brush 50 and the holder 70 are disposed on the side opposite to the side where the rotary fan 3 is located with respect to the rotor 10. With this configuration, it is possible to prevent the passage of the air sucked by the rotary fan 3 and flowing through the air guide 4 from being blocked by the torsion spring 60, the brush 50 and the holder 70.

Thereby, the fall of the efficiency of electric motor 2 can be controlled, and the fall of the air output of electric blower 1 can be controlled.

As described above, according to the electric motor 2 and the electric blower 1 in the present embodiment, the efficiency is lowered even when the torsion spring 60 is used as a brush spring for pressing the brush 50 against the commutator 40. It is possible to realize a long-life, small-sized motor and an electric blower, which can be suppressed.

Further, in the motor 2 and the electric blower 1 according to the present embodiment, the coil portion 61 of the torsion spring 60 and the brush 50 are disposed so as to overlap along the longitudinal direction of the shaft 30.

This configuration can realize a smaller motor and motor blower. In addition, since the passage of air can be further prevented from being blocked by the torsion spring 60 and the brush 50, it is possible to further suppress the reduction in efficiency.

Further, in the motor 2 and the electric blower 1 according to the present embodiment, the holder 70 for holding the torsion spring 60 has a locking claw 72 for locking the coil portion 61 of the torsion spring 60.

With this configuration, it is possible to suppress the torsion spring 60 housed in the holder 70 from jumping out of the holder 70 while the torsion spring 60 is in operation. Moreover, the workability at the time of installing the torsion spring 60 in the holder 70 can also be simplified. For example, in the present embodiment, since the locking claw 72 is provided in the spring storage portion 71, the coil portion 61 is locked by snap-in only by pushing the coil portion 61 of the torsion spring 60 into the spring storage portion 71. The pawl 72 can be locked, and the torsion spring 60 can be easily held by the holder 70.

Further, in the motor 2 and the electric blower 1 according to the present embodiment, the holder 70 and the brush 50 are disposed so as to overlap along the longitudinal direction of the shaft 30.

This configuration can realize a smaller motor and motor blower. In addition, since the passage of the air can be suppressed from being blocked by the holder 70 as well as the torsion spring 60 and the brush 50, the decrease in efficiency can be further suppressed.

Moreover, the holder 70 in the present embodiment can also be used for another motor as a holder for the motor. In this case, the holder 70 may have a spring housing portion 71 for housing the torsion spring 60 and a locking claw 72 provided on the inner surface of the spring housing portion 71 and locked to the coil portion 61 of the torsion spring 60.

Accordingly, it is possible to suppress the torsion spring 60 stored in the spring storage portion 71 from jumping out from the spring storage portion 71.

Moreover, the electric blower 1 comprised in this way is used for a domestic vacuum cleaner, for example. Hereinafter, the vacuum cleaner 8 in which the electric blower 1 is used is demonstrated using FIG. FIG. 8 is a schematic view showing an example of a vacuum cleaner 8 using the electric blower 1 according to the embodiment.

As shown in FIG. 8, the vacuum cleaner 8 is provided with the electric blower 1 using the electric motor 2, and the control part 8a which controls the electric blower 1 (electric motor 2). In the vacuum cleaner 8, the electric blower 1 sucks and cleans. The controller 8a controls the electric blower 1 (electric motor 2). For example, the control unit 8a stops or starts the suction by the electric blower 1, and adjusts the suction amount.

As described above, since the electric vacuum cleaner 8 according to the present embodiment uses the electric blower 1 according to the above-described embodiment, it is possible to realize a long-life and compact electric vacuum cleaner having a high suction force.

(Modification)
As mentioned above, although the electric motor concerning this indication, an electric blower, a vacuum cleaner, a holder for electric motors, etc. were explained based on an embodiment, this indication is not limited to the above-mentioned embodiment.

For example, in the above embodiment, the surface of the brush 50 in contact with the torsion spring 60, that is, the outer end surface in the longitudinal direction of the brush 50 is a flat surface, but the present invention is not limited thereto. Specifically, as shown in FIG. 9, a concave portion 50a for receiving at least a part of the bent portion 62a formed in the arm portion 62 of the torsion spring 60 is formed on the surface in contact with the torsion spring 60 of the brush 50. It may be done. That is, a bent portion 62 a is formed at an end portion of the first arm portion 62 b in contact with the brush 50 among the pair of arm portions 62 and in contact with the brush 50. A recess 50a that receives at least a part of the bending portion 62a is formed on the outer surface of the brush 50 and in contact with the first arm 62b. In this case, the recess 50a may have a shape following the shape of the bending portion 62a. In the above embodiment, since the bent portion 62a is curved in an arc shape, in FIG. 9, the recess 50a is a lateral groove having a semicircular cross-sectional shape. As described above, by forming the recess 50a in the brush 50 and by causing the bent portion 62a formed in the arm portion 62 of the torsion spring 60 to fit in the recess 50a, the pressure by the torsion spring 60 is stabilized and the brush is stabilized. It can be granted to 50.

Moreover, in the said embodiment, although the two holders 70 were the structures which were each independent and were isolate | separated and arrange | positioned, it does not restrict to this. For example, the plurality of holders 70 may be configured in one piece (one-piece structure). By thus making the holder 70 integral, the mounting operation of the holder 70 can be simplified. From the viewpoint of attaching the holders 70, when the plurality of holders 70 are integrated, it is preferable to integrate the even number of holders 70.

Further, in the above embodiment, the example in which the electric motor 2 is used for the electric blower 1 has been described, so the rotation object attached to the shaft 30 is the rotation fan 3, but the present invention is not limited thereto. For example, the rotation target attached to the shaft 30 of the motor 2 is not limited to the rotation fan 3 but may be a pulley or the like.

In addition, an embodiment obtained by applying various modifications that those skilled in the art may think to the above embodiment, and an embodiment realized by arbitrarily combining components and functions in the embodiment without departing from the spirit of the present disclosure. Are also included in the present disclosure.

The technology of the present disclosure can be applied to various electric devices such as electric motors, electric blowers, and electric vacuum cleaners, and in particular, electric electric blowers mounted on electric vacuum cleaners or automobile devices operated at high speed rotation. It is useful.

DESCRIPTION OF SYMBOLS 1 Electric blower 2 Electric motor 3 Rotation fan 4 Air guide 5 1st bracket 6 2nd bracket 7 Fan case 7a Air intake 8 Electric vacuum cleaner 8a Control part 10 Rotor 11 Core 12 Winding coil 20 Stator 30 Shaft 40 Commutator 50 Brush

50a Concave portion

50b, 50c End face 60 Torsion spring 61 Coil portion 62 Arm portion 62a Bend portion 62b First arm portion 70 Holder 71 Spring storage portion

71a Opening portion

71b Bottom portion 72 Locking claw 73 Brush storage portion 73a Opening portion 81 First bearing Part 82 Second bearing part 90 Support plate 100 Electric blower 200 Motor 210 Rotor 220 Stator 230 Shaft 240 Commutator 250 Brush 260 Torsion spring 261 Coil part 262a Arm part 270 Brush holder 300 Rotating fan 300a Ankesu 400 air guide 500 housing 500a first bracket 500b second bracket

Claims

With the rotor,
A shaft fixed to the rotor,
A commutator attached to the shaft,
A brush disposed slidably on the commutator;
A torsion spring that presses the brush against the commutator;
Coil part,
A pair of arm portions extending in a direction in which each of the coil portions has a positional relationship of twisting with respect to a winding axis of the coil portion;
A torsion spring having
Equipped with
The torsion spring is disposed such that the winding axis is substantially orthogonal to the longitudinal direction of the shaft.
Electric motor.
The coil portion of the torsion spring and the brush are disposed so as to overlap along the longitudinal direction of the shaft.
The motor according to claim 1.
A bent portion is formed at an end portion of the first arm portion in contact with the brush among the pair of arm portions and in contact with the brush,
The outer surface of the brush, which is in contact with the first arm portion, is formed with a recess for receiving at least a part of the bent portion.
The electric motor according to claim 1 or 2.
And a holder for holding the torsion spring.
The holder includes a locking claw that locks the coil portion of the torsion spring.
The motor according to any one of claims 1 to 3.
The holder and the brush are disposed so as to overlap along the longitudinal direction of the shaft.
The motor according to claim 4.
A plurality of the holders are arranged,
The plurality of holders are configured in one piece,
The electric motor according to claim 4 or 5.
The shaft has a portion to which a rotating object is attached,
The torsion spring is disposed on the side of the rotor opposite to the side where the portion is located in the longitudinal direction of the shaft.
The electric motor according to any one of claims 1 to 6.
A motor according to any one of claims 1 to 7;
A rotating fan attached to the shaft of the motor;
Equipped with
Electric blower.
The torsion spring is disposed on the side of the rotor opposite to the side where the rotary fan is located in the longitudinal direction of the shaft.
The electric blower according to claim 8.
The electric blower according to claim 8 or 9,
A control unit that controls the electric blower;
Equipped with
Vacuum cleaner.
A motor holder for holding a torsion spring that biases a brush disposed slidably on a commutator attached to a shaft toward the commutator, the motor holder comprising:
A spring storage portion for storing the torsion spring;
A locking claw provided on an inner surface of the spring storage portion and locking the coil portion such that a winding axis of the coil portion of the torsion spring is substantially orthogonal to a longitudinal direction of the shaft;
including,
Motor holder.