JPH10257740A - Electric air blower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric air blower which has a minimum change in electric and magnetic characteristics, thereby having a stable characteristic by regulating a magnetic reluctance of the stator. SOLUTION: A pair of field coils 19 is wound around a field iron core 18 and magnetic flux 20 runs in the field iron core 18. A movable magnetic body- made iron core constituted of a spring body 21 and an adjustment screw 22 is installed in a part of the field iron core 18, thereby changing a cross-sectional area of the field iron core 18. Where electromotive force generated in a winding 25 of a rotor 24 is E, magnetic flux of a field is Φ, the number of rotations is N and the total number of conductors of an armature is Z, a relationship between these physical quantities is expressed by an expression E=NZΦ. Therefore, a magnetic reluctance can be changed by regulating the number of times of insertion of the magnetic body-made iron core 23 into the field iron core 18, the magnetic flux to the stator can be adjusted, and the electromotive force of the rotor 24 can be changed, too. By this method, the electric characteristic of the electric air blower can be adjusted to any values.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric blower.

[0002]

2. Description of the Related Art A conventional electric blower will be described below with reference to FIG.

[0003] That is, the electric blower 1 forms an outer shell by an air guide 2 formed of resin, a load side bracket 3 and a non-load side bracket 4 formed of resin, and a stator is provided in the anti-load side bracket 4. 5 is fixed, and a plurality of bosses formed on the load-side bracket 3 contact the upper end surface of the stator 5 to fix the stator 5. The rotor is composed of an armature 6, a commutator 7, a shaft 8 and a set of bearings 9. On the load side of the rotor, an impeller 10 has a spacer 11, a washer 1
2 and a nut 13 fixed to the rotor shaft 8. The intake pipe 14 is fixed by the air guide 2, and the brush holder 15 fixed to the non-load side is fixed by the non-load side bracket 4. The impeller 10 is a casing 16
Is covering. The anti-load side bracket 4 has a built-in carbon brush 17 in a brush holder 15.

[0004]

In the conventional electric blower 1, the state of contact between the commutator 7 and the carbon brush 17, the state of formation of the carbon film on the surface of the commutator 7, and the electric state of the rotor and the stator 5 are described. There are many characteristic fluctuation factors such as variation in magnetic characteristics, assembly factors, and the like, and power consumption and air output fluctuate.

An object of the present invention is to solve the above-mentioned conventional problems, and an object of the present invention is to provide an electric blower in which fluctuations in electric and magnetic characteristics are minimized and characteristics are stable. .

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention comprises magnetic resistance adjusting means capable of freely adjusting the cross-sectional area of a part of a field iron core of a stator.

In order to solve the above-mentioned problem, a hole is provided in a field core near a magnetic flux emitting portion to a rotor where a magnetic flux is concentrated due to an armature reaction of a stator, and a pin made of a metal magnetic material is connected to the field magnetic core. It is inserted into a hole of an iron core, and the degree of insertion is variably configured to provide a means for adjusting the magnetic resistance of the stator.

In order to solve the above-mentioned problem, a second coil independent of a magnetic flux generating coil provided on a stator of an electric blower is wound around a field core to reduce a load impedance of the second coil. The stator magnetic flux amount adjusting means is configured to be adjustable.

In order to solve the above-mentioned problem, an auxiliary coil for generating a magnetic flux in a direction opposite to a main magnetic flux is wound around a field iron core separately from a magnetic flux generating coil provided on a stator of an electric blower. Of the stator magnetic flux amount adjusting means so as to be able to adjust the load impedance or the conduction current.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention can be embodied in the form described in each claim. That is, claim 1 of the present invention
As in the invention described, by providing a magnetic resistance adjusting means for freely adjusting the passage cross-sectional area of the magnetic flux in a part of the field iron core, the magnetic path cross-sectional area of the field iron core of the stator is changed to reduce the magnetic resistance. By adjusting the magnetic flux amount of the field, the electric characteristics can be stabilized and the electric characteristics can be stabilized.

According to a second aspect of the present invention, the magnetic resistance adjusting means includes a hole provided in the vicinity of a magnetic flux emitting portion to a rotor in which magnetism is concentrated due to an armature reaction of the field core. By using a pin made of a metal magnetic material and slidably inserted into the hole, the magnetic resistance can be changed efficiently and the characteristics of the electric blower can be stabilized.

Also, as in the invention according to claim 3 of the present invention, a second coil independent of the coil is wound around the field core, and the load impedance of the second coil is adjusted to reduce the amount of magnetic flux of the stator. By providing the magnetic flux amount adjusting means for adjusting, the load impedance of the second coil is adjusted, and the flow of the main magnetic flux generated by the field coil is limited by the auxiliary magnetic flux which reverses to adjust the total magnetic flux amount of the stator. Thus, the characteristics of the electric blower can be stabilized.

According to a fourth aspect of the present invention, an auxiliary coil connected in parallel to the coil and generating a magnetic flux in a direction opposite to the direction of the magnetic flux induced by the coil is provided on the field core. Winding, by providing a magnetic flux amount adjusting means for adjusting the load impedance of the auxiliary coil or the conduction current flowing through the auxiliary coil to adjust the magnetic flux amount of the stator, in the direction opposite to the direction of the main magnetic flux on the field core of the stator. By generating a magnetic flux, adjusting the load impedance or the energizing current of the auxiliary coil, restricting the flow of the main magnetic flux generated by the field coil by the auxiliary magnetic flux that reverses, and adjusting the total magnetic flux amount of the stator. The characteristics of the electric blower can be stabilized.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS.

(Embodiment 1) FIG. 1 shows a configuration of a stator.
9 is wound, and a magnetic flux 20 flows in the field iron core 18 as shown by an arrow in FIG. Example 1
Is provided with a magnetic core 23 movable as a magnetic resistance adjusting means by means of an adjusting screw 22 with a spring 21 interposed in a part of the field core 18 so that the cross-sectional area of the field core 18 can be adjusted. It is composed.

Therefore, according to the configuration of the first embodiment, the degree of insertion of the magnetic core 23 into the field core 18 is adjusted by the screw 22.
, The magnetic resistance of the entire field changes.

If the electromotive force generated in the winding 25 of the rotor 24 is E, the magnetic flux of the field is Φ, the rotation speed is N, and the total number of conductors of the armature is Z, the relationship of E = NZΦ is obtained. By adjusting the degree of insertion of the magnetic iron core 23 into the field iron core 18, the magnetic resistance changes and the magnetic flux Φ of the stator can be adjusted. That is, the electromotive force of the rotor 24 also changes, and the electric characteristics of the electric blower can be adjusted arbitrarily.

(Embodiment 2) In the configuration of Embodiment 2 shown in FIG. 2, a hole 26 is provided in the field iron core 18 near the magnetic flux emitting portion to the rotor where the magnetic flux is concentrated due to the armature reaction of the stator. A pin 27 made of a magnetic material is inserted into the field core 18, the degree of insertion of the pin 27 made of a metal magnetic material into the field core 18 is configured to be variable, and the magnetic resistance of the stator is configured to be adjustable. The portion 26 and the pin 27 made of a metal magnetic material constitute a magnetic resistance adjusting means.

The operation according to the second embodiment is the same as the operation of the magnetic iron core 23 in the first embodiment and the pin 27 of the metal magnetic material in the second embodiment. Can be adjusted arbitrarily.

(Embodiment 3) In the configuration of Embodiment 3 shown in FIG. 3, a second coil 29 independent of the magnetic flux generating coil 28 provided on the stator of the electric blower.
Is wound around the field core 18 so that the load impedance of the second coil 29 can be adjusted by the variable resistor 30. The amount of magnetic flux for adjusting the amount of magnetic flux of the stator by the second coil 29 and the variable resistor 30 Adjusting means.

The operation according to the third embodiment is such that the flow of the main magnetic flux generated by the magnetic flux generating coil 28 is restricted by the auxiliary magnetic flux by the second coil 29 which reverses the flow, and the variable resistor 30 is adjusted by adjusting the variable resistor 30. This adjusts the total magnetic flux amount.

Therefore, the electric characteristics of the electric blower can be arbitrarily adjusted as in the first and second embodiments.

(Embodiment 4) In the configuration of Embodiment 4 shown in FIG. 4, the direction of the magnetic flux of the main field is parallel to one of the magnetic flux generating coils 31 provided on the stator of the electric blower. An auxiliary coil 32 that generates an opposite magnetic flux is wound around the field iron core 18 and is constituted by a variable resistor 30 provided so that the load impedance of the auxiliary coil 32 or the current supplied to the auxiliary coil 32 can be adjusted.
The auxiliary coil 32 and the variable resistor 30 constitute a magnetic flux amount adjusting means for adjusting the magnetic flux amount of the stator.

The operation according to the fourth embodiment is to adjust the total magnetic flux of the stator by forcibly applying an auxiliary magnetic flux that reverses the flow of the main magnetic flux generated by the magnetic flux generating coil 31 from the outside.

Therefore, the electric and magnetic characteristics of the electric blower can be arbitrarily adjusted as in the first, second and third embodiments.

[0026]

According to the first aspect of the present invention,
By adjusting the magnetic resistance by changing the magnetic path cross-sectional area of the field core of the stator, it is possible to appropriately control the amount of magnetic flux of the field and to stabilize the electric characteristics of the electric blower, such as electric power and air output. it can.

According to the second aspect of the present invention, the characteristics of the electric blower can be efficiently stabilized by providing the magnetic resistance adjusting means in a portion where the magnetic flux generated in the stator is concentrated by the armature reaction. Can be achieved.

According to the third aspect of the present invention, the total magnetic flux of the stator is adjusted by limiting the flow of the main magnetic flux generated by the field coil by the auxiliary magnetic flux that is reversed. The characteristics of the electric blower can be stabilized.

According to the invention of claim 4 of the present invention, the auxiliary magnetic flux which reverses the flow of the main magnetic flux generated by the field coil is forcibly applied from the outside to adjust the total magnetic flux amount. And electric characteristics such as electric power and air output of the electric blower can be stabilized.

[Brief description of the drawings]

FIG. 1 is a main part configuration diagram of a stator of an electric blower according to a first embodiment of the present invention. FIG.

FIGS. 2A and 2B are main part configuration diagrams of a stator of an electric blower according to a second embodiment of the present invention, wherein FIG.

FIG. 3 is a plan view of a main part of a stator of an electric blower according to a third embodiment of the present invention.

FIG. 4 is a circuit diagram of a stator of an electric blower according to a fourth embodiment of the present invention.

FIG. 5 is a partial side sectional view of an electric blower in a conventional example.

[Explanation of symbols]

 Reference Signs List 18 field iron core 19 field coil 20 magnetic flux 21 spring body 22 adjusting screw 23 magnetic iron core 24 rotor 25 winding 26 hole 27 metal magnetic pin 28, 31 magnetic flux generating coil 29 second coil 30 variable resistor 32 Auxiliary coil

Claims (4)

[Claims] A rotor rotatably held; an impeller fixed to a shaft of the rotor; a stator comprising a coil and a field core; and a cross-sectional area of a magnetic flux passing through a part of the field core. Electric blower provided with magnetic resistance adjusting means for freely adjusting the pressure. 2. A magnetic resistance adjusting means, wherein a hole is provided in the vicinity of a magnetic flux emission part to a rotor where magnetism is concentrated due to an armature reaction of a field core, and is slidably inserted into the hole. The electric blower according to claim 1, further comprising a metal magnetic pin. 3. A rotor which is rotatably held, an impeller fixed to a shaft of the rotor, and a stator comprising a coil and a field core. A second coil independent of the coil is connected to a field core. And an electric blower provided with magnetic flux amount adjusting means for adjusting the load impedance of the second coil to adjust the magnetic flux amount of the stator. 4. A rotor rotatably held, an impeller fixed to a shaft of the rotor, and a stator composed of a coil and a field core, connected in parallel with the coil, and connected to the coil by the coil. A magnetic flux adjusting means for winding an auxiliary coil for generating a magnetic flux in a direction opposite to the induced magnetic flux direction around a field iron core, and adjusting the load impedance of the auxiliary coil or the current flowing through the auxiliary coil to adjust the magnetic flux of the stator. The electric blower provided with.