JPH0946999A - Commutator motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide motor characteristics for preventing spark between a brush and a commutator and having reduction effect of third harmonic current components even if an AC sine-wave voltage is applied, in the stator magnetic structure of a commutator motor. SOLUTION: A stator core is split to an outer magnetic circuit 2a and an inner magnetic circuit 3. Anisotropic silicon steel plate is used as the circuit 3, and its axis of easy magnetization is fixed to fix the direction of flowing a magnetic flux. The flowing direction of the flux is fixed to alleviate the local saturation of the core to make the flow of the flux uniform, thereby preventing the variation of the neutral point of the armature. When an AC voltage is applied, the third harmonic wave current due to the local saturation of the flux can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator magnetic structure of a commutator motor, and more particularly to a commutator motor used in a cleaner motor or the like.

[0002]

2. Description of the Related Art Conventionally, commutator motors have been widely used as motors for electric power tools and the like because they are connected to a commercial power source and a DC power source and can obtain high speed rotation with a simple structure.

A conventional commutator motor will be described below. FIG. 8 is a diagram showing the configuration of a conventional commutator motor, which is composed of a stator core 1 and a rotor core 4.
An isotropic silicon steel plate is used for the stator core 1. When the winding method is prioritized, the isotropic silicon steel plate of the stator core 1 is divided and used.

[0004]

However, since the conventional stator core uses the isotropic silicon steel plate, when the rotor is rotated, the armature neutral point is caused by the load fluctuation and the AC voltage application. Change, and there was a problem that a spark was generated between the brush and the commutator piece.

Further, according to the conventional commutator motor, when an AC voltage is applied, a current waveform including a third harmonic wave is generated due to magnetic saturation at the tooth tips of the inner magnetic path portion of the stator core, and voltage control is performed. When operating the commutator motor, there is a problem that a controlled AC voltage cannot be applied because it leads to destruction of the capacitor of the circuit.

The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide a commutator motor in which spark generation is prevented and the third harmonic current is reduced.

[0007]

To achieve this object, the commutator motor of the present invention has a structure in which an anisotropic silicon steel plate is used for the inner magnetic path portion of the stator core.

[0008]

According to this magnetic structure, when the voltage is applied and the rotor is rotated, the flow of magnetic flux can be fixed by the anisotropic silicon steel plate of the inner magnetic path portion of the stator core, and the armature neutral Sparks generated between the brush and the commutator piece due to the movement of the points can be prevented.

Further, according to this magnetic structure, when an AC voltage is applied, the flow of the magnetic flux is fixed, so that the magnetic saturation at the tooth tips of the inner magnetic path portion is relaxed, so that the third harmonic current is reduced. And can be used in combination with a control circuit.

In order to explain this action, FIG. 9 shows the flow of magnetic flux when a voltage is applied to a commutator motor using a conventional isotropic silicon steel plate to rotate the rotor.

The magnetic flux is concentrated on the tip portions 8g and 8h of the stator core teeth, and the magnetic flux is small in the central portions 8e and 8f of the stator core teeth, and the magnetic flux in the stator core teeth is uneven and is not effectively used. I understand. Therefore, the fluctuation of the magnetic flux density is large due to the load fluctuation and the difference of the AC voltage.

In order to explain the operation of the present invention, FIG. 7 shows a voltage applied to a commutator motor using an anisotropic silicon steel plate in the inner magnetic path part of the stator core and an isotropic silicon steel plate in the outer magnetic path part. Shows the flow of magnetic flux when the rotor is rotated by applying.

It can be seen that the magnetic flux is evenly distributed and effectively used in the central portions 8a and 8b of the stator core teeth.
For this reason, the variation in the density of the magnetic flux is small even if the variation in the load and the variation in the AC voltage are small, and the saturation of the magnetic flux can be suppressed locally.

The present invention has been made to solve the above-mentioned conventional problems, and by devising the stator structure without increasing the number of manufacturing steps, the flow of magnetic flux in the stator core of the inner magnetic path portion is improved. It is possible to provide a motor characteristic that also has the effect of reducing the third harmonic current component when an AC voltage is applied without deteriorating the motor characteristic.

[0015]

【Example】

(Embodiment 1) An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a front view of the motor assembly of the present invention. In FIG. 1, reference numeral 2a is an isotropic silicon steel sheet having laminated outer magnetic path portions. Reference numeral 3 denotes an anisotropic silicon steel sheet having a laminated inner magnetic path portion, and 2a is press-fitted and fixed or welded and fixed. Reference numeral 9 indicates the direction of rotation of the rotor 4, and when the rotor 4 rotates counterclockwise, the direction of the easy axis of magnetization of the anisotropic silicon steel plate of the inner magnetic path portion 3 is set to the direction 10 The angle S, which is considered to be the line connecting the centers of, is fixed.

(Second Embodiment) A second embodiment of the present invention will be described with reference to the drawings.

FIG. 2 shows a front view of a stator core of a motor according to the second embodiment of the present invention. The stator iron plate of FIG. 2 is obtained by changing the shape of the stator of FIG. 1, and is composed of an isotropic silicon steel plate 2b and an anisotropic silicon steel plate 3.
The direction of the easy axis of magnetization of the anisotropic silicon steel plate 3 in the inner magnetic path is 1
The structure has a direction of 0.

(Embodiment 3) A third embodiment of the present invention will be described with reference to the drawings.

FIG. 3 is a front view of a stator core of a motor according to the third embodiment of the present invention. The stator iron plate of FIG. 3 is obtained by changing the shape and material composition of the stator of FIG. 1, and is anisotropic silicon steel plates 2e and 2f of the outer magnetic path part and three anisotropic silicon steel plates of the inner magnetic path part. The axes of easy magnetization of (3) have the directions of 13a, 13b, and 10, respectively.

(Embodiment 4) A fourth embodiment of the present invention will be described with reference to the drawings.

FIG. 4 is a front view of a stator core of a motor according to the fourth embodiment of the present invention. The stator iron plate of FIG. 4 is obtained by changing the shape and material composition of the stator of FIG. 1, and the anisotropic silicon steel plates 2g, 2h, 2i of the outer magnetic path part and the anisotropy of 3 of the inner magnetic path part. The easy axis of magnetization of the silicon steel sheet has a structure having directions of 13c, 13d, 13e and 10, respectively.

(Embodiment 5) A fifth embodiment of the present invention will be described with reference to the drawings.

FIG. 5 is a front view of a stator core of a motor according to the fifth embodiment of the present invention. The stator iron plate of FIG. 5 is obtained by changing the shape and material composition of the stator of FIG. 1, and the magnetization of the anisotropic silicon steel plate 2e of the outer magnetic path part and the anisotropic silicon steel plate 3 of the inner magnetic path part Each easy axis is 1
The outer magnetic path portion 2c having the directions 3a and 10 is an isotropic silicon steel plate.

(Embodiment 6) A sixth embodiment of the present invention will be described with reference to the drawings.

FIG. 6 shows a front view of a stator core of a motor in a sixth embodiment of the present invention. The stator iron plate of FIG. 6 is obtained by changing the shape and material composition of the stator of FIG. 1, and is anisotropic silicon steel plates 2g and 2h of the outer magnetic path part and three anisotropic silicon steel plates of the inner magnetic path part. The axes of easy magnetization of 13 have the directions of 13a, 13d, and 10 respectively, and have 2 of the outer magnetic path portions.
d is an isotropic silicon steel plate.

[0027]

As described above, according to the present invention, by providing an anisotropic silicon steel plate on the inner magnetic path portion of the stator core, the spark generated between the brush and the commutator is prevented and an AC voltage is applied. An excellent commutator motor capable of reducing the third harmonic current can be realized.

[Brief description of drawings]

FIG. 1 is a structural diagram of a commutator motor according to a first embodiment of the present invention.

FIG. 2 is a structural diagram of a stator of a commutator motor according to a second embodiment of the present invention.

FIG. 3 is a structural diagram of a stator of a commutator motor according to a third embodiment of the present invention.

FIG. 4 is a structural diagram of a stator of a commutator motor according to a fourth embodiment of the present invention.

FIG. 5 is a structural diagram of a stator of a commutator motor according to a fifth embodiment of the present invention.

FIG. 6 is a structural diagram of a stator of a commutator motor according to a sixth embodiment of the present invention.

FIG. 7 is a cross-sectional view in the direction perpendicular to the axis showing the flow of magnetic flux by the stator according to the present invention.

FIG. 8 is a structural diagram of a conventional commutator motor.

FIG. 9 is a cross-sectional view in the direction perpendicular to the axis showing the flow of magnetic flux by the stator when the present invention is not implemented.

[Explanation of symbols]

1 Stator core using integrated type isotropic silicon steel plate 2 Outer magnetic path part by split type stator 2a, 2b, 2c, 2d Isotropic silicon steel plate 2e, 2f, 2g, 2h, 2i Anisotropy Silicon steel plate 3 Anisotropy silicon steel plate of inner magnetic path part by split type stator 4 Rotor 5 Field winding 6 Armature winding 7 Rotation axis 8 Magnetic flux 9 Rotation direction 10 Anisotropy silicon of inner magnetic path part Direction of easy axis of magnetization of steel plate 11 Angle from easy axis of anisotropic silicon steel plate of inner magnetic path part 12 Reference line for angle of easy axis of anisotropic silicon steel plate of inner magnetic path part 13 The easy axis of magnetization of anisotropic silicon steel sheet in the outer magnetic path

Claims (9)

[Claims] 1. A stator core divided into an outer magnetic path part and an inner magnetic path part, wherein an isotropic silicon steel plate is used for the outer magnetic path part and an anisotropic silicon steel plate is used for the inner magnetic path part. A commutator motor characterized by the following. 2. A stator core divided into an outer magnetic path portion and an inner magnetic path portion, wherein the outer magnetic path portion and the inner magnetic path portion further divided are each provided with an anisotropic silicon steel sheet. Commutator motor. 3. In a stator core divided by an outer magnetic path portion and an inner magnetic path portion, the outer magnetic path portion is divided into a plurality of parts.
A commutator motor, characterized in that an isotropic silicon steel sheet and an anisotropic silicon steel sheet are used in combination and the inner magnetic path portion is provided with the anisotropic silicon steel sheet. 4. When the angle S of the easy axis of magnetization of the anisotropic silicon steel plate of the inner magnetic path of the stator is based on the central axis between the teeth of the stator, S = 0 degree in the direction opposite to the rotation direction. The commutator motor according to claim 1, wherein the commutator motor is set to 90 degrees. 5. The commutator motor according to claim 4, wherein S = 50 to 70 degrees. 6. When the angle S of easy axis of magnetization of the anisotropic silicon steel plate of the inner magnetic path of the stator is based on the central axis between the teeth of the stator, S = 0 degrees in the direction opposite to the rotation direction. The commutator motor according to claim 2, wherein the commutator motor is set to 90 degrees. 7. The commutator motor according to claim 6, wherein S = 50 to 70 degrees. 8. When the angle S of the easy axis of magnetization of the anisotropic silicon steel plate of the inner magnetic path of the stator is based on the central axis between the teeth of the stator, S = 0 degrees in the direction opposite to the rotation direction. The commutator motor according to claim 3, wherein the commutator motor is set to about 90 degrees. 9. The commutator motor according to claim 8, wherein S = 50 to 70 degrees.