JPH09252573A - Stepping motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a cylindrical stepping motor by a method wherein a rotor and a stator are so arranged as to have the direction of a magnetic field by a stator coil cross the rotation plane of the rotor. SOLUTION: A rotor 9 consisting of a 2-pole permanent magnet 8 and a 2-pole stator 11 are magnetically coupled with each other with a gap 10 therebetween. For this purpose, a flat part 40 in which a rotor hole 41 in which the rotor 9 is placed is formed and 2 connection units 22 and 23 which are bent in directions approximately perpendicular to the flat part 11 are provided. Coil core ends 26 and 26 on both ends of the coil 12 are respectively connected to the connection terminal parts 24 and 25 of the connection units 22 and 23. With this constitution, the direction of a magnetic field generated by the coil 12 crosses the rotation plane of the rotor 9 and a cylindrical brushless stepping motor can be obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a step motor structure.

[0002]

2. Description of the Related Art As shown in FIG. 9, a conventional step motor is disclosed in Japanese Patent Application Laid-Open No. 6-235777, filed by the applicant of the present invention, and the step motor 101 is a rotor composed of two-pole permanent magnets 105. 104 is a flat step motor composed of a stator 102 and a coil 103 that are magnetically coupled to the rotor 104 via a gap 108, and the coil 103 includes a drive coil and a counter electromotive voltage detection coil for detecting the rotor position. The rotor 1 detects the rotor position based on the rotor position detection signal from the back electromotive force detection coil.
No. 04 is a brushless step motor that is rotationally driven at a high speed, and is a step motor that can be used as a vibration motor by fixing an eccentric weight 107 to a rotor shaft 106 as shown in FIG. In addition, the rotor 1
Since the driving method of No. 04 is disclosed in detail in the above publication, the description thereof will be omitted here.

[0003]

However, as shown in FIG.
As shown in FIG. 4, the step motor 101 is incorporated in the timepiece case 109 so that the rotor shaft 106 is substantially perpendicular to the bottom surface 110 of the back cover of the timepiece case 109 in order to prevent the thickness of the timepiece case 109 from increasing. So
The vibration surface of the eccentric weight, which is substantially perpendicular to the rotor shaft 106, becomes substantially parallel to the bottom surface 110 of the case back of the watch case 109, and the vibration of the eccentric weight is difficult to be transmitted to the arm 111. Therefore, in order to make it easier to transmit the vibration of the eccentric weight to the arm, a vibration motor in which the vibration surface of the eccentric weight can be made substantially perpendicular to the surface of the arm 111 is desired.

The present invention has been made to solve the above problems, and an object thereof is to provide a cylindrical step motor that can be used as a vibration motor.

[0005]

The structure of the present invention for achieving the above object comprises a rotor comprising two-pole permanent magnets,
A two-pole stator magnetically coupled to the rotor via a gap, and a step motor including a coil,
The coil is a step motor, wherein the coil is arranged such that a magnetic field direction generated by the coil intersects a rotation plane of the rotor.

Further, the stator has a flat portion having a rotor hole for accommodating and arranging the rotor, and two connecting portions formed by bending the rotor at a substantially right angle to the flat portion. The coil is connected to the connecting end of the connecting portion.

Further, at least one of the connecting end of the connecting portion of the stator and the winding end of the coil is bent, and the wide surface of the connecting end of the connecting portion of the stator and the winding end of the coil are connected. The wide surfaces are connected on the same surface.

The step motor has a cylindrical shape, and the rotor shaft and the coil are arranged in the cylindrical axis direction.

The wide surface of the connecting portion of the stator is
It is characterized in that it faces the narrow surface of the winding core of the coil.

Further, the step motor has a circuit board having at least a driver IC, a power supply terminal and a control terminal, and the circuit board is arranged such that the length of the circuit board is in the cylindrical axis direction of the step motor. It is characterized by being arranged.

Further, the step motor is a vibration motor having an eccentric weight fixed to a rotor shaft.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is an external view of a step motor of the present invention. Since the step motor 1 is brushless, not only two power supply terminals 3 and 4, but also a control terminal 5 is provided.
(In the present embodiment, a step motor ON / OFF terminal is provided), and a non-magnetic material frame 6 is provided with a stator, a coil, and a circuit board, as described below.
Two screw holes 7 are provided in order to be fixed to.

FIG. 2 is a structural diagram of the inside of the step motor of the present invention, and FIG. 3 is a rotor of the step motor of the present invention.
The structure of the step motor will be described with reference to the connection diagram of the stator and the coil.

As shown in FIG. 3, the magnetic circuit of the step motor includes a rotor 9 composed of a two-pole permanent magnet 8, an exciting coil, a coil 12 composed of a detection coil for detecting the rotational position of the rotor, and a gap 10. A rotor hole portion 41 for magnetically coupling to the rotor 9 for accommodating and arranging the rotor 9.
A flat portion 40 having the above-mentioned shape, two connecting portions 22 and 23 formed by bending the flat portion 40 at a substantially right angle, and a bent connection for connecting to the core end portion 26 of the coil 12. It is composed of a two-pole stator 11 having ends 24, 25, the wide surface of the connecting ends 24, 25 and the core end 26.
The wide surfaces of are connected on the same surface, and the stator 11 and the coil 1 are
In order to avoid a magnetic short circuit between the two, the wide surface 13 of the connecting portion 23 faces the narrow surface 14 of the winding core of the coil 12.

Next, referring to FIG. 2, the characteristics of the step motor will be described. The rotor shaft 2 of the rotor 9 is received by the two rotor bearings 15 and 16, and the rotor shaft 2 and the coil 12 are received.
Are arranged in the cylinder axis direction 21. Screws 19, 20
Has a stepper driver IC, 17 and two power supply terminals 3, 4 and a control terminal 5, and the longitudinal axis is the cylindrical shaft 2.
The circuit board 18 and the stator 1 arranged in one direction
1 and the coil 12 are fixed to the frame 6 through the screw holes 7 provided in the frame 6 (in FIG.
Is omitted. ), And the coil terminals of the coil 12 are in close contact with and electrically connected to the respective coil connection patterns (omitted in FIG. 2) of the circuit board 18. The method of driving the step motor of the present invention is described in Japanese Patent Application Laid-Open No. 6-2 of the present applicant.
Since it is the same as the driving method disclosed in Japanese Patent No. 35777, its description is omitted.

From the above description, a cylindrical structure of a step motor can be realized, which is composed of the rotor 9 composed of the two-pole permanent magnets 8, the two-pole stator 11, the coil 12 and the circuit board 18. That is, according to the above configuration, the magnetic field generated by the coil 12 can be arranged so as to intersect the rotation plane of the rotor 9.

FIG. 4 is an external view of an eccentric weighted step motor of the present invention. In the eccentric weighted step motor 27, the eccentric weight 28 is attached to the rotor shaft 2 of the step motor 1, and the vibrating surface of the eccentric weight 28 is the rotor shaft 2. It can be used as a vibration motor because it is fixed so that it is perpendicular to.

FIG. 8 is a sectional view of mounting the eccentric weighted step motor 27 on a wrist of a wristwatch incorporating the eccentric weighted step motor 27 as a vibration motor. By assembling the watch case 109 so as to be parallel, the vibrating surface of the eccentric weight 28 becomes vertical to the bottom surface 110 of the case back as shown in the figure.
Since the vibration surface of the eccentric weight 28 is substantially perpendicular to the surface of the arm, the vibration of the eccentric weight 28 is easily transmitted to the arm 111.

FIG. 5 is an external view of another step motor of the present invention. Since the step motor 30 is brushless, not only the two power supply terminals 3 and 4, but also the control terminal 5 (this experiment) In the example, a non-magnetic material frame 31 having a step motor ON / OFF terminal is provided with two screw holes 7 for fixing the coil and the circuit board to the frame 31, and a stator, as described below. Similarly, two screw holes 32 for fixing the coil to the frame 31 are provided.

The structure of the step motor will be described with reference to FIG. 6 which is a structural view of the inside of the step motor of the present invention and FIG. 7 which is a connection diagram of the rotor, stator and coils of the step motor of the present invention.

As shown in FIG. 7, the magnetic circuit of the step motor is magnetically coupled to the rotor 9 via a gap 9 and a rotor 9 composed of a permanent magnet 8 having two poles so that the rotor 9 can be housed and arranged. Flat part 40 having a hole 41
And a two-pole stator 3 including two connecting portions 22 and 23 formed by bending the flat portion 40 at a substantially right angle.
3 and a coil 34 having bent core ends 35 and 36 for connecting to the connecting parts 22 and 23, and the wide surface of the connecting parts 22 and 23 at two places and the core end 3
The wide surfaces of 5, 36 are connected on the same plane, and in order to avoid a magnetic short circuit between the connecting portion 23 and the coil 34, the connecting portion 23
The wide surface 13 of the coil 34 faces the narrow surface 14 of the winding core of the coil 34.

Next, referring to FIG. 6, the characteristics of the step motor will be described. The rotor shaft 2 of the rotor 9 is received by the two rotor bearings 15 and 16, and the rotor shaft 2 and the coil 34 are received.
Are arranged in the cylinder axis direction 21. Screws 19, 20
Has a stepper driver IC, 17 and two power supply terminals 3, 4 and a control terminal 5, and the longitudinal axis is the cylindrical shaft 2.
Circuit board 18 and coil 34 arranged so as to be in one direction
Are fixed to the frame 31 through the screw holes 7 provided in the frame 31 (the frame 31 is omitted in FIG. 6), and the coil terminals of the coil 34 are the coil connection patterns of the circuit board 18 ( In FIG. 2, it is adhered and conducted to (not shown). In addition, the coil 34
Of the core end portions 35, 36 of the rotor and the connecting portions 22, 2 of the stator 33
3 is screw 37, 38 through the screw hole 32 of the frame 31
It is fixed to the frame 31 by.

In this embodiment, the direction of the magnetic field generated by the coil intersects the plane of rotation of the rotor substantially perpendicularly, but the present invention is not limited to this, and the range of intersection. It may be placed at an angle.

[0025]

As described above, according to the first to fifth aspects, a cylindrical brushless step motor is possible, and according to the sixth aspect, the vibration is transmitted to the arm. There is an effect that it is possible to provide a wristwatch with an improved vibration motor.

[Brief description of drawings]

FIG. 1 is an external view of a step motor according to the present invention.

FIG. 2 is a structural diagram of the inside of a step motor of the present invention.

FIG. 3 is a step motor rotor and stator of the present invention;
It is a connection diagram of a coil.

FIG. 4 is an external view of a step motor with an eccentric weight according to the present invention.

FIG. 5 is an external view of another step motor according to the present invention.

FIG. 6 is a structural diagram of the inside of another step motor of the present invention.

FIG. 7 is a connection diagram of a rotor, a stator, and a coil of another step motor according to the present invention.

FIG. 8 is a cross-sectional view of mounting on a wrist of a wrist watch incorporating the step motor with an eccentric weight according to the present invention.

FIG. 9 is a plan view of a conventional step motor.

FIG. 10 is a cross-sectional view of mounting on a wrist of a wristwatch incorporating a conventional step motor with an eccentric weight.

[Explanation of symbols]

 1, 30 step motor 3, 4 power supply terminal 8 permanent magnet 9 rotor 11, 33 stator 12, 34 coil 17 driver IC 18 circuit board 22, 23 connection part 24, 25 connection end part 28 rotary weight 35, 36 winding core end part 40 Flat part 41 Rotor hole part

Claims (7)

[Claims] 1. A step motor comprising a rotor composed of a two-pole permanent magnet, a two-pole stator magnetically coupled to the rotor via a gap, and a coil, wherein the coil is a magnetic field generated by the coil. A stepping motor, wherein the stepping motor is arranged so that a direction thereof intersects a rotation plane of the rotor. 2. The stator has a flat portion having a rotor hole portion for accommodating and arranging the rotor, and two connecting portions formed by bending the flat portion at a substantially right angle. The step motor according to claim 1, wherein the coil is connected to a connection end portion of the connection portion. 3. A connecting end of the connecting portion of the stator and at least one of a core end of the coil are bent, and a wide surface of the connecting end of the connecting portion of the stator and a core end of the coil are bent. The step motor according to claim 2, wherein the wide surfaces are connected on the same surface. 4. The step motor according to claim 2, wherein the step motor has a cylindrical shape, and the rotor shaft and the coil are arranged in the cylindrical axis direction. 5. The wide surface of the connecting portion of the stator opposes the narrow surface of the winding core of the coil.
Step motor described in. 6. The step motor has a circuit board having at least a driver IC, a power supply terminal, and a control terminal, and the circuit board is arranged such that the length of the circuit board is in the cylindrical axis direction of the step motor. The step motor according to claim 2, wherein the step motor is arranged. 7. The step motor according to claim 2, wherein the step motor is a vibration motor having an eccentric weight fixed to a rotor shaft.