JP2020054067A - Electric blower and vacuum cleaner using the same - Google Patents

Abstract

To provide an electric blower that has excellent blowing efficiency, a small size, and a light weight, by providing a housing for supporting a bearing of a rotor to a stator insulating body and by shortening the axial length of the electric blower without using any end bracket.SOLUTION: The electric blower includes a brushless motor 16 that is formed of a stator 10 disposed on the outer circumference of a rotor 9 having a rotary shaft 2, and of a bracket 6 holding one bearing 5 of the rotary shaft 2 and covering the stator 10, an impeller 17 that is fixed to the rotary shaft 2, an air guide 18 that forms an air path on the outer circumference of the impeller 17, and a fan case 19 covering the impeller 17. The stator 10 is formed of a stator core 11, an insulating body 8, and a stator winding 12. A housing 7b for supporting the other bearing 5 of the rotary shaft 2 is provided to the insulating body 8.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an electric blower that realizes a brushless motor with a small and lightweight configuration and has high air blowing efficiency and productivity, and a vacuum cleaner using the same.

  2. Description of the Related Art Conventionally, in this type of electric blower, in order to hold a bearing of a rotating shaft, a configuration is often used in which one is held by a housing mechanism provided on a bracket covering a stator and the other is held by a housing mechanism provided on an end bracket (for example, And Patent Document 1).

  FIG. 5 is a front sectional view of the conventional electric blower described in Patent Document 1, and as shown in the figure, a rotor constituting the motor of the conventional electric blower is sandwiched between a bracket covering an stator and an end bracket. It was common to have been.

JP 2013-57300 A

  However, in the configuration of the conventional electric blower described in Patent Literature 1, since the bearing is supported by the end bracket having the housing mechanism, the number of components increases, the ventilation resistance increases, and the axial direction of the motor increases. There was a problem that.

  The present invention solves the above-mentioned conventional problems, and reduces the number of parts, reduces the ventilation resistance, shortens the axial length of the motor, achieves light weight, improves the blowing efficiency, and realizes downsizing. An object is to provide an electric blower and a vacuum cleaner.

  In order to solve the conventional problem, the electric blower of the present invention includes a rotor having a rotating shaft, a stator disposed on the outer periphery of the rotor, and a bracket that holds one bearing of the rotating shaft and covers the stator. A brushless motor configured, an impeller fixed to the rotating shaft, an air guide that forms a ventilation path on the outer periphery of the impeller, and a fan case that covers the impeller and is fixed to the front surface of the air guide, The stator is formed of a stator core, an insulator, and a stator winding, and is provided with a housing that supports the other bearing of the rotary shaft on the insulator. It is necessary to hold the bearing with an end bracket having a housing mechanism. Since the airflow resistance is reduced, the axial length of the brushless motor can be reduced and the number of parts can be reduced. It is possible to provide a highly productive electric blower.

  Moreover, the electric vacuum cleaner of the present invention is equipped with the electric blower according to claim 1 or 2, and can provide a small and lightweight electric vacuum cleaner.

  ADVANTAGE OF THE INVENTION The electric blower of this invention can improve blowing efficiency and productivity by reducing the number of parts, and can also reduce size and weight.

Front sectional view of the electric blower according to Embodiment 1 of the present invention. Partial top view of the electric blower Front sectional view of an electric blower according to Embodiment 2 of the present invention. Partial top view of the electric blower Front sectional view of a conventional electric blower

  According to a first aspect of the present invention, there is provided a brushless motor including a rotor having a rotating shaft, a stator disposed on an outer periphery of the rotor, and a bracket for holding one bearing of the rotating shaft and for covering the stator. A fixed impeller, an air guide forming an air passage around the outer periphery of the impeller, and a fan case covering the impeller and fixed to a front surface of the air guide, wherein the stator has a stator core, an insulator, and a stator winding. It is formed of a wire, and a housing for supporting the other bearing of the rotary shaft is provided on the insulator. Since there is no need to hold the bearing with an end bracket having a housing mechanism, ventilation resistance is reduced, and a brushless motor is provided. It is possible to provide a compact, lightweight, and highly productive electric blower that can shorten the axial length and reduce the number of parts. Kill.

  A second invention particularly provides the electric blower according to the first invention, further comprising a terminal for connecting a stator winding, and a terminal block for fixing the terminal to an insulator. In this case, the insulator that covers the yoke portion of the stator core can be reduced, and a lightweight and highly productive electric blower can be obtained.

  A vacuum cleaner according to a third invention is equipped with the electric blower according to claim 1 or 2, and can provide a small and lightweight vacuum cleaner.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited by the embodiment.

(Embodiment 1)
FIG. 1 is a front sectional view of an electric blower according to Embodiment 1 of the present invention, and FIG. 2 is a partial top view of the electric blower.

  1 and 2, an electric blower 1 according to the present embodiment includes a rotating shaft 2, an annular magnetic body 3 fixed to the rotating shaft 2, an annular non-magnetic metal 4 for balancing rotation, and a rotating shaft. 2, a rotor 9 supported by a housing 7 a provided on a bracket 6 and a housing 7 b provided on an insulator 8 of a stator 10, and a stator arranged on the outer periphery of the rotor 9. 10, a bracket 6 covering the stator 10, a stator core 11, a stator winding 12 for generating a magnetic field, an insulator 8 for insulating the stator core 11 and the stator winding 12, and a connection between the stator winding 12. A brushless motor 16 including a terminal 13 and a terminal block 14 for fixing the terminal 13, a control circuit board 15 for controlling rotation, an impeller 17 fixed to the rotating shaft 2, An air guide 18 forming an air passage, and a fan case 19 for covering the impeller 17.

  Reference numeral 20 denotes a yoke portion of the stator core 11.

  The operation and operation of the electric blower 1 according to the present embodiment configured as described above will be described below.

First, the operation of the electric blower 1 will be described. 1 and 2, a rotating magnetic field is generated by exciting the stator winding 12, the rotor 9 rotates in synchronization with the rotating magnetic field, and the impeller 17 fixed to the rotating shaft 2 rotates. As the impeller 17 rotates, the air inside the impeller 17 is pushed to the outer periphery, the inside of the impeller 17 becomes negative pressure, and an airflow flowing into the impeller 17 is generated.

  The airflow flows in the axial direction from the suction port 17a of the impeller 17, and is discharged to the outer periphery of the impeller 17. The airflow discharged from the impeller 17 flows into the air guide 18. The airflow that has flowed into the air guide 18 flows into the bracket 6 while being decelerated, and the airflow that has cooled the rotor 9 and the stator 10 cools the control circuit board 15 without receiving ventilation resistance due to the absence of the end bracket. Exhausted.

  As described above, in the present embodiment, the housing 5 used in the related art is supported by supporting the bearing 5 of the rotor 9 with the housing 7 b provided on the insulator 8 of the stator core 11 and the stator winding 12. No end bracket is required, thereby reducing ventilation resistance, shortening the axial length of the electric blower 1 and reducing the number of parts, and improving the ventilation efficiency and cooling air flow to the control circuit board 15 and productivity. And the size and weight can be reduced.

(Embodiment 2)
FIG. 3 is a front sectional view of the electric blower according to the second embodiment of the present invention, and FIG. 4 is a front sectional view of the electric blower. The same components as those of the electric blower according to Embodiment 1 are denoted by the same reference numerals, and description thereof will be omitted.

  3 and 4, an electric blower 1a according to the present embodiment is provided with a terminal 13 and a terminal block 14 for fixing the terminal 13 on an outer peripheral portion of a housing 7b. It is the same as the electric blower in mode 1.

  The operation and operation of the electric blower 1a according to the present embodiment configured as described above will be described below.

  When the stator winding 12 is excited, a rotating magnetic field is generated, the rotor 9 rotates in synchronization with the rotating magnetic field, and the impeller 17 fixed to the rotating shaft 2 rotates. As the impeller 17 rotates, the air inside the impeller 17 is pushed to the outer periphery, the inside of the impeller 17 becomes negative pressure, and an airflow flowing into the impeller 17 is generated. The air current flows in the axial direction from the suction port 17 a of the impeller 17 and is discharged to the outer periphery of the impeller 17.

  The airflow discharged from the impeller 17 flows into the air guide 18. The airflow that has flowed into the air guide 18 flows into the bracket 6 while being decelerated, and the airflow that has cooled the rotor 9 and the stator 10 cools the control circuit board 15 without receiving ventilation resistance due to the absence of the end bracket. Exhausted.

  As shown in FIGS. 3 and 4, the terminals 13 are used to connect the windings of each phase in the stator winding 12. At this time, the one wound around the stator core 11 generates a magnetic field. The magnetic force is generated and becomes magnetic force through the stator core 11 which is a magnetic material. However, the winding extended for connection does not contribute to the magnetic force because there is a distance to the stator core 11 which is a magnetic material. It is desirable to reduce the length of the extending winding as much as possible to suppress the winding resistance loss, and it is desirable in terms of motor efficiency.

  As described above, according to the present embodiment, by disposing terminal block 14 on the outer peripheral portion of housing 7b instead of yoke portion 20 of stator core 11, the length of the winding for connection and stator core 11 Of the insulator 8 can be minimized.

As described above, in the present embodiment, by disposing the terminal block 14 on the outer peripheral portion of the housing 7b, the length of the winding for connection and the size of the insulator 8 of the stator core 11 are minimized. By suppressing the winding resistance loss, the motor efficiency can be improved and the number of parts can be reduced, so that productivity can be improved and the weight can be reduced.

  If the electric blower (1 or 1a) described in Embodiment 1 or 2 is mounted on a vacuum cleaner (not shown), the vacuum cleaner can be reduced in size and weight.

  As described above, the electric blower according to the present invention can be reduced in size, weight, and cost, and can improve reliability, and can be applied to a vacuum cleaner.

DESCRIPTION OF SYMBOLS 1, 1a Electric blower 2 Rotary shaft 3 Annular magnetic body 4 Annular nonmagnetic metal 5 Bearing 6 Bracket 7a, 7b Housing 8 Insulator 9 Rotor 10 Stator 11 Stator core 12 Stator winding 13 Terminal 14 Terminal block 15 Control circuit board 16 Brushless motor 17 Impeller 17a Suction port 18 Air guide 19 Fan case 20 Yoke

Claims (3)

A brushless motor including a rotor having a rotating shaft, a stator disposed on the outer periphery of the rotor, and a bracket that holds one bearing of the rotating shaft and covers the stator, and an impeller fixed to the rotating shaft, An air guide that forms a ventilation path on the outer periphery of the impeller, and a fan case that covers the impeller and is fixed to the front surface of the air guide, wherein the stator is formed of a stator core, an insulator, and a stator winding; An electric blower, wherein a housing for supporting the other bearing of the rotating shaft is provided on an insulator. The electric blower according to claim 1, further comprising a terminal for connecting a stator winding, and a terminal block for fixing the terminal to an insulator, wherein the terminal block is arranged on an outer peripheral portion of a housing. An electric vacuum cleaner equipped with the electric blower according to claim 1.