JPH0819204A - Motor - Google Patents

Abstract

PURPOSE:To provide a motor which excels in assembly without decreasing torque. CONSTITUTION:In a motor which is provided with a rotor 1, a first yoke 8 having a nearly L-shaped cross section, a first magnet 10 having an arc-shaped inner circumferential surface inside a second yoke 9, a first case 6 having a second magnet 11 and a second case 7, the first case 6 and the second case 7 are disposed around the rotor 1 so that the magnets 10, 11 are symmetrical to the axial center of the rotor 1 and that the center of the rotor 1 agrees with the center of the arc of the magnets 10, 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor that can be assembled orthogonally to an axis, and is most suitable for a small direct current motor.

[0002]

2. Description of the Related Art As a prior art, Japanese Patent Laid-Open No. 63-12144.
There is a technique disclosed in Japanese Patent No. FIG. 3 shows a part of the motor assembling method disclosed in the publication.

In the motor assembling method shown in FIG. 3, bearings 31 are mounted on both ends of the rotary shaft center of the rotor 30, and the bearings 31 are mounted on the bearing supports 32 in a direction orthogonal to the rotary shaft. A pair of field magnets 34 are fixedly arranged so as to provide an opening 33 wider than the maximum diameter part of the rotor 30 and a field space continuous to the opening 33 inside the substantially U-shaped cross section. The field yoke 35 is mounted in a direction orthogonal to the rotating shaft, and at this time, the bearing 31 of the rotating shaft is attached to the bearing support portion 3.
The rotor 30 is arranged in the field space through the opening 33 while being supported by the rotor 2. By providing the above-mentioned structure, it is possible to perform a planar stacking operation orthogonal to the axial direction, which facilitates the assembling, and thereby enables the cost reduction.

[0004]

However, in the technique disclosed in the above publication, an opening wider inside than the maximum diameter portion of the rotor and a field connected to the opening are formed inside the substantially U-shaped cross section. Since a field yoke in which at least a pair of field magnets is fixedly arranged is installed so as to provide a space, it is necessary to make a large air gap between the rotor and the field magnet. Speaking excellently, there is a problem that the generated torque becomes smaller than that of a normal motor of the same size.

Therefore, an object of the present invention is to provide a motor which is excellent in assemblability without reducing the generated torque.

[0006]

In order to solve the above-mentioned problems, the invention of claim 1 provides a rotor around which a winding is wound, a first yoke having a substantially L-shaped cross section, and one side of the first yoke. A first case having a first magnet provided inside, a second case having a second yoke having a substantially L-shaped cross section and a second magnet provided inside one side of the second yoke; Equipped with. Further, the first case and the second case are arranged such that the first magnet and the second magnet and the first yoke and the second yoke are arranged at positions symmetrical to the axial center of the rotor, respectively. did.

According to a second aspect of the invention, in the first aspect of the invention, the first magnet and the second magnet have arc-shaped inner peripheral surfaces, and the first magnet and the second magnet
The center of the arc of the magnet was aligned with the center of the rotor.

[0008]

According to the first aspect of the present invention, the rotor is rotated in response to the magnetic fields generated by the first magnet and the second magnet by passing a current through the winding. When the motor is assembled, the first case and the second case are arranged at symmetrical positions with respect to the center of the rotor, and the motors are assembled by bringing them close to each other.

Further, according to the second aspect of the invention, the first magnet and the second magnet have an arcuate inner peripheral surface centered on the axial center of the rotor. Generates a magnetic field. Therefore, the magnetic fields of the first magnet and the second magnet work efficiently on the rotor.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 is a view showing the assembly of a motor according to an embodiment of the present invention. Also,
FIG. 2 is a front view of FIG.

The configuration of this embodiment will be described. The motor of this embodiment is a small DC brush motor. An armature winding 3 is wound around the rotor 1, and the rotor 1 is mounted on the armature core 2 and an axis of the armature core 2 and is electrically connected to the armature winding. With commutator 4
The rotation detecting ring magnet 5 is fitted in the armature core 2. The first case 6 is made of iron and is approximately L
It is composed of a character-shaped first yoke 8 and a first magnet 10 which is provided on one side inside the first yoke 8 and is made of a permanent magnet. The second case 7 is composed of a substantially L-shaped first yoke 9 made of iron, and a second magnet 11 made of a permanent magnet and provided on one side inside the second yoke 9. The inner peripheral surfaces of the first magnet 10 and the second magnet 11 are formed in an arc shape, form an arc slightly larger than the diameter of the outer circumference of the rotor 1, and the first magnet and the second magnet The center of the arc of the magnet is aligned with the center of the rotor. Also, the first case 6
And the second case 7 has the assembling parts 12, 13, for assembling.
14 and 15 are provided. Further, the brush 16 made of metal graphite and supplying an exciting current is assembled on the back side of the circuit board 17 forming an electronic control device for controlling the drive of the motor, and when the circuit board 17 is arranged inside the housing 18. The brush 16 is in sliding contact with the commutator 4. Further, on the back side of the circuit board 17, in addition to the brush 16, a Hall IC 19 for detecting the rotation of the rotor 1 from the rotation of the rotation detecting ring magnet 5, a positive temperature coefficient thermistor 20 for preventing the brush 16 from burning, and a noise prevention. A relay 22 that connects and disconnects a current path with the capacitor 21 and the brush 16 is installed. The rotation shaft of the rotor 1 has an output shaft 23 that operates along with the rotation of the rotor 1.
And a worm gear 24 for power transmission.

Next, a method of assembling the motor will be described. The angle between the bottom of the housing 18 and the assembly direction is 3
The range of 0 ° to 40 ° is preferable, but the optimum angle changes depending on the shapes of the housing 17 and the magnets 10 and 11. However, the angle does not deviate from the range of 0 ° to 90 °.

First, the first case 6 is assembled to the housing 18 from an oblique direction as indicated by an arrow in FIG. The assembling is performed by screwing the assembling portion 12 of the first case 6 to the housing 18. Next, from the same angle of the rotor 1 in the diagonal direction, the axial center of the rotor 1 is the housing 1
Assemble so that it fits with the bearing provided in 8. Then, the second case 7 is screwed to the first case 6 and the housing 18 by assembling from the same angle in the oblique direction. Next, the circuit board 17 is lowered from above the housing 18 and assembled to the motor. Then, the worm gear 24 is assembled from above the housing 18 like the circuit board 17, and finally, the cover 25 of the housing 18 is attached to complete the assembly.

Next, the operation of the motor of this embodiment will be described. When a switch signal is input to the electronic control unit formed on the circuit board 17, the relay 22 connects the current path with the brush 16 and a current flows through the commutator 4 to the armature winding 3 to cause the rotor to rotate. A magnetic field is generated at 1. This magnetic field causes the first magnet 10 and the second magnet 11 to
The rotor 1 rotates in repulsion with the magnetic field formed by. The output shaft 23 is driven by driving the worm gear 24 according to the rotation of the rotor 1. Hall IC
Reference numeral 19 detects the rotation of the rotor 1 and outputs a detection signal to the electronic control unit.

In this embodiment, a motor in which the electronic control unit and the worm gear are integrally formed in the housing of the motor is shown, but the present invention is not limited to this embodiment, and the winding is wound. The present invention can be applied to any motor as long as it has a rotor and a case composed of a magnet and a yoke divided into two parts.

In the motor of the present invention, the magnets 10 and 11 and the yokes 8 and 9 forming the field space to be applied to the rotor 1 are divided into two parts, so that the motor can be assembled from one direction and the motor It is also possible to prevent the generated torque from decreasing.

[0017]

According to the first aspect of the invention, since one set of magnets is provided in separate cases having a substantially L-shaped cross section, the respective parts of the motor can be assembled from one direction so as not to interfere with each other. This facilitates the assembly of the motor. Therefore, the man-hours for assembling the motor can be reduced in mass production and automatic production, leading to cost reduction.

According to the invention of claim 2, in addition to the effect of claim 1, since the inner peripheral surfaces of the first magnet and the second magnet are arcuate, the distance between the rotor and the magnet, that is, The air gap can be made uniform without increasing the air gap, and a decrease in the torque generated by the motor can be prevented.

[Brief description of drawings]

FIG. 1 is a diagram showing a method of assembling a motor according to a first embodiment of the present invention.

FIG. 2 is a front view of FIG.

FIG. 3 is a perspective view showing a method of assembling a conventional shaft orthogonal motor.

[Explanation of symbols]

1 ... Rotor 2 ... Armature iron core 3 ... Armature winding 4 ... Commutator 5 ... Rotation detecting ring magnet 6 ... First case 7 ... Second case 8 ... First yoke 9 ... Second yoke 10 ... First
Magnet 11 ... Second magnet 12, 13, 1
4, 15 ... Assembly part 16 ... Brush 17 ... Circuit board 18 ... Housing 19 ... Hall IC 20 ... Positive characteristic thermistor 21 ... Capacitor 22 ... Relay 23. ..Output shaft 25 ... Housing cover 24 ... Worm gear

Claims (2)

[Claims] 1. A rotor around which a winding is wound, a first yoke having a substantially L-shaped cross section, and a first magnet provided inside one side of the first yoke, and a cross section. A second case having a substantially L-shaped second yoke and a second magnet provided inside one side of the second yoke; and the first magnet, the second magnet, and the second magnet. A motor in which the first case and the second case are arranged such that the first yoke and the second yoke are arranged at symmetrical positions with respect to the axial center of the rotor, respectively. 2. The first magnet and the second magnet have arc-shaped inner peripheral surfaces, and the arc center of the first magnet and the second magnet is set to the center of the rotor. The motor according to claim 1, wherein the motor is combined.