JPH1137792A - Assembling method for sensor device, sensor device, and motor apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an assembling method that surely prevents a sensor from coming into contact with a rotor when the sensor is attached to a sensor casing by bringing a jig, which is attached to a shaft so as to ensure a gap, into contact with the sensor and attaching the sensor to the sensor casing. SOLUTION: The sensor device is constituted so as to be provided with a rotor 5, which is attached to a shaft 1a, a base member 2a, in which a ring- shaped position regulation part 2a1 is formed so as to be eccentric with reference to the shaft 1a, a sensor 7a, which faces the rotor 5, and a sensor casing 3, to which the sensor 7a is attached and which is attached to the base member 2a. The sensor casing 3 is turned along the position regulation part 2a1, the gap between the sensor 7a and the rotor 5 is adjusted, and the sensor device is assembled. In this case, a jig 10 which regulates the gap so as to become a prescribed amount or lower is attached to the shaft 1a, and the sensor 7a is attached to the sensor casing 3. In addition, while the jig 10 is being attached to the shaft 1a, the sensor casing 3 is turned until the clearance between the position regulation part 2a1 and a sliding part is eliminated at least in the position regulation part 2a1 and the sensor casing 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sensor device having a sensor such as a magnetic sensor and a rotor such as a rotor magnet and a motor.

[0002]

2. Description of the Related Art Various types of sensor devices have been proposed which detect the number of rotations and the direction of rotation of a rotor magnet using a magnetic sensor. In such a sensor device, it is necessary to adjust the gap between the magnetic sensor and the rotor magnet.

For example, FIGS. 6 to 9 show a conventional sensor device. In these figures, 65 is a rotor magnet fixed to the rotating shaft of the motor, and 66 is a magnetic sensor.

The magnetic sensor 66 is held by a magnetic sensor holding member 67b facing the rotor magnet 65, and the magnetic sensor holding member 67b is
9c, it is fixed to a mounting member (base member) 62b. A screw 69c is attached to the magnetic sensor holding member 67b.
Is formed, and a projection 67b inserted into a hole (not shown) of the mounting member 62b is formed.
2 are formed. In the sensor device configured as described above, the magnetic sensor 66 and the rotor are rotated by the assembler manually turning the magnetic sensor holding member 67b around the protrusion 67b2 inserted into the hole in the direction M in FIG. The gap with the magnet 65 can be adjusted. The gap adjustment is performed while driving the motor 61 to rotate the rotor magnet 65 and observing the output signal of the magnetic sensor 66.

[0005] In the sensor device having the above structure,
Before rotating the motor 61, a shim is sandwiched between the magnetic sensor 66 and the rotor magnet 65, the gap is adjusted, the shim is removed, and the motor 61 is rotated to observe the output signal of the magnetic sensor 66. There is also.

Further, in the sensor device having the same configuration as described above, a gear is provided on the side end surface of the magnetic sensor holding member, and the gear portion of the jig is engaged with the gear.
There is also a method of adjusting the gap while rotating the motor and observing the output signal of the magnetic sensor (Japanese Patent Laid-Open No. 61-12 / 1986).
No. 9526).

However, in the method of adjusting the gap by rotating the magnetic sensor holding member 67b with the protrusion 67b2 as a fulcrum as described above, since the chip of the magnetic sensor 66 has an area, the sensor chip surface has a rotor magnet. There is a problem that it is rarely located in parallel to 65. In this case, for example, when the sensor output signal has two phases, there occurs a problem that the output voltages are extremely different.

In the method in which the assembler rotates the magnetic sensor holding member 67b by hand, the surface of the sensor chip may come into contact with the rotor magnet 65 due to hand shaking or the like, and these may be damaged.

Further, the method of using a shim is effective when the magnetized pitch of the rotor magnet is wide to some extent. However, when the magnetized pitch is narrow, the position of the magnetic sensor changes when the screw is tightened, and the gap is reduced. May need to be readjusted, which causes a problem that the number of assembly steps increases.

Therefore, the present applicant rotates the sensor casing, to which the sensor (and the sensor holding member) is attached, along an annular position regulating portion formed eccentrically with respect to the rotor rotation axis on the base member. By doing
A sensor device that can adjust the gap between the sensor and the rotor is proposed. According to this sensor device, the gap can be adjusted while maintaining the parallelism between the sensor chip surface and the rotor magnet.

[0011]

However, since the sensor casing and the base member having the position restricting portion are also separately manufactured parts, it is necessary to consider dimensional tolerances when manufacturing them. For example, when the magnetization pitch of the rotor magnet is 100 μm, the appropriate gap is 50 μm.
In this case, the dimensional tolerance between the sensor casing and the position restricting portion needs to be extremely small, each being 1/10 or less of the appropriate gap. For this reason, there arises a problem that the manufacturing cost of these components increases.

In addition, a clearance may be generated between the position restricting portion and the sliding surface of the sensor casing between the position restricting portion due to the dimensional tolerance. In this case, the sensor casing rattles in the radial direction on the base member. ,
There is a problem that the gap cannot be adjusted properly.

[0013]

In order to solve the above problems, the present invention provides a rotor attached to a rotating shaft, a base member having an annular position regulating portion formed eccentric to the rotating shaft, and The sensor comprises a sensor facing the rotor, and a sensor casing to which the sensor is attached and which is attached to the base member.The sensor casing is rotated along the position regulating portion to adjust the gap between the sensor and the rotor. In the method of assembling the sensor device, the jig for controlling the gap to be equal to or less than a predetermined amount is attached to the rotating shaft, the sensor is attached to the sensor casing, and the jig is attached to the rotating shaft. The clearance between at least the sliding part between the position regulating part and the position regulating part in the sensor casing So that rotating the sensor casing until no.

Further, according to the present invention, in the sensor device having the above-described structure, the mounting position of the rotor on the rotating shaft is restricted so that the gap is not more than a predetermined amount when the sensor is mounted on the sensor casing and when the gap is adjusted. The jig is set at a position where the jig is attached to the rotating shaft (for example, a position where the end of the rotating shaft projects from the rotor).

That is, in these inventions, the sensor (or a sensor holding member for holding the gap) is brought into contact with the gap securing jig attached to the rotating shaft so that the sensor is attached to the sensor casing. This ensures that the sensor does not come into contact with the rotor when attached to the sensor casing.

In addition, by rotating the sensor casing while the jig and the sensor are kept in contact with each other, the gap between the sensor and the rotor is maintained constant while the sensor casing and the position regulating portion are initially positioned. The existing clearance is canceled, and the sensor casing can be brought into contact with the position regulating portion. After that, the jig is removed from the rotating shaft, and the sensor casing is rotated along the position regulating portion, so that the gap can be smoothly adjusted.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION

(First Embodiment) FIGS. 1 to 5 show a sensor device according to a first embodiment of the present invention and a motor provided with the sensor device. In these figures, reference numeral 1 denotes a motor, and a sensor device is attached to a side of the motor opposite to a side where the driving force is taken out. An output shaft 1a protruding from the motor 1 extends into the sensor device, and a rotor magnet 5 is fixed to the output shaft 1a.

Here, the fixed position of the rotor magnet 5 on the output shaft 1a is a position at which a jig 10 described later can be attached at the time of assembling the sensor device, that is, FIG.
The upper end of the output shaft 1a is set at a position protruding from the upper surface of the rotor magnet 5 by an appropriate length.

The rotor magnet 5 is magnetized in accordance with λ of the magnetic sensor 6, and the magnetic sensor 6 is held by a magnetic sensor holding member 7a so as to face the magnetized surface of the rotor magnet 5. . The magnetic sensor holding member 7a is fixedly held on the sensor casing 3 by screws 9c.

Reference numeral 2a denotes a mounting member (base member). As shown in FIG. 5, the mounting member 2a has an eccentric center O 'with respect to the center O of the output shaft 1a (as shown in FIG. 2). (Radial distances from the center O are α and β.) An annular position restricting portion 2a1 is formed. The sensor casing 3 can be rotated along the position restricting portion 2a1 while being placed on the mounting member 2a.

The sensor substrate 4 is fixed to the sensor casing 3 by screws 9a and 9b.

When assembling the sensor device configured as described above, first, the magnetic sensor holding member 7a holding the magnetic sensor 6 is mounted on the sensor casing 3 mounted on the mounting member 2a. At this time, FIG. 3 and FIG.
The jig 10 is attached to a portion of the output shaft 1a protruding from the rotor magnet 5, as shown in FIG.

Here, the jig 10 has a press-fit hole 10a into which the output shaft 1a is press-fitted, and two arm portions 10b extending parallel to each other in the radial direction of the press-fit hole 10a and having the same length.

When attaching the magnetic sensor holding member 7a to the sensor casing 3 (tightening the screw 9c), the end face of the magnetic sensor holding member 7a is attached to the jig 1.
0, while making contact with the end faces of the two arm portions 10b. The length of the two arms 10b is such that a predetermined gap is created between the magnetic sensor 6 held by the magnetic sensor holding member 7a abutting on these end faces and the magnetized surface of the rotor magnet 5. Is set to For this reason,
When the screw 9c is tightened, contact between the magnetic sensor 6 and the magnetized surface of the rotor magnet 5 can be reliably prevented.

Next, the motor 1 is rotated to rotate the rotor magnet 5, and the sensor casing 3 is moved to adjust the gap between the magnetic sensor 6 and the rotor magnet 5 while observing the output signal of the magnetic sensor 6. Although the rotation is performed along the restricting portion 2a1, the contact between the magnetic sensor 6 and the rotor magnet 5 is prevented by the jig 10 as described above, so that the magnetic sensor 6 and the rotor magnet 5 may be damaged. There is no.

The sensor casing 3 is moved to the position regulating portion 2a1.
When the rotation is started along the axis, the magnetic sensor of the sliding surface between the position restricting portion 2a1 and the position restricting portion 2a1 in the sensor casing 3 as shown by a chain line in FIG. There may be a gap (clearance) C between the holding member 7a and the portion 3a corresponding to the mounting position. However, the magnetic sensor holding member 7a is attached to the jig 1
When the sensor casing 3 starts rotating along the position restricting portion 2a1 while being pressed against the 0 arm portion 10b, the distance between the center O of the output shaft 1a and the portion 3a of the sensor casing 3 is kept constant. As the sensor casing 3 is rotated in the N direction in FIG. 5, the clearance between the portion 3a and the position regulating portion 2a1 eccentric with respect to the center O is canceled, and the portion 3a and the position regulating portion 2a1 Abuts. Thus, the part 3
When the jig 10 is detached from the output shaft 1a after the contact between the a and the position restricting portion 2a1, and the sensor casing 3 is rotated in the N direction or the opposite direction while observing the output signal of the magnetic sensor 6, the magnetic The gap can be adjusted to an appropriate amount by moving the sensor holding member 7a and the magnetic sensor 6 away from or near the magnetized surface of the rotor magnet 5.

After the gap is adjusted to an appropriate amount as described above, the sensor casing 3 is fixed to the mounting member 2a, and the opening of the sensor casing 3 is closed with the sensor cap 8, as shown in FIG.

In this embodiment, the sensor device having a magnetic sensor has been described, but the present invention can be applied to a sensor device having a sensor other than the magnetic sensor. In the present embodiment, the sensor device attached to the motor has been described.
The present invention can also be applied to a sensor device attached to a rotating body other than a motor.

[0029]

As described above, according to the present invention,
The sensor is attached to the sensor casing by contacting the sensor with the gap securing jig attached to the rotating shaft, so that the sensor does not contact the rotor when the sensor is attached to the sensor casing. can do.

Further, if the sensor casing is rotated while the jig and the sensor are in contact with each other, the gap between the sensor and the rotor is maintained constant while the gap between the sensor and the rotor is kept constant. The existing clearance can be canceled, and the sensor casing can be brought into contact with the position regulating portion. After that, the jig is removed from the rotation shaft, and the sensor casing is rotated along the position regulating portion, so that the gap adjustment can be performed smoothly.

[Brief description of the drawings]

FIG. 1 is a plan view of a sensor device according to a first embodiment of the present invention.

FIG. 2 is a side sectional view of the sensor device.

FIG. 3 is a plan view showing a state where a jig is attached to the sensor device.

FIG. 4 is a side sectional view showing a state where a jig is attached to the sensor device.

FIG. 5 is a plan view of a mounting member of the sensor device.

FIG. 6 is a plan view of a conventional sensor device.

FIG. 7 is a side view of a motor including the conventional sensor device.

FIG. 8 is a plan view of a sensor holding member of the conventional sensor device.

FIG. 9 is a side sectional view of the conventional sensor holding member.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Motor 1a Output shaft 2a Mounting member 2a1 Position restricting part 3 Sensor casing 4 Sensor board 5 Rotor magnet 6 Magnetic sensor 7a Magnetic sensor holding member 8 Sensor cap 10 Jig

Claims (6)

[Claims] 1. A rotor attached to a rotating shaft, a base member having an annular position restricting portion formed eccentric with respect to the rotating shaft, a sensor facing the rotor, A sensor casing attached to the member,
In a method for assembling a sensor device in which the sensor casing is rotated along the position regulating portion to adjust and assemble a gap between the sensor and the rotor, a jig for regulating the gap to be equal to or less than a predetermined amount is provided. A method for assembling a sensor device, comprising: attaching the sensor to the sensor casing by attaching the sensor to the rotating shaft. 2. The sensor device assembly according to claim 1, wherein after the sensor is mounted on the sensor casing, the sensor casing is rotated while the jig is mounted on the rotation shaft. Method. 3. A rotor attached to a rotating shaft, a base member formed with an annular position restricting portion eccentric to the rotating shaft, a sensor facing the rotor, and the sensor attached to the base. A sensor casing attached to the member,
In a sensor device for assembling by adjusting the gap between the sensor and the rotor by rotating the sensor casing to which the sensor is attached along the position restricting portion, the assembling position of the rotor on the rotating shaft is assembling. A sensor device, wherein a jig for restricting the gap from becoming smaller than a predetermined amount is set at a position where the jig is attached to the rotating shaft. 4. The sensor device according to claim 3, wherein the attachment position is a position where an end of the rotation shaft projects from the rotor. 5. A motor device comprising the sensor device according to claim 3 or 4. 6. The motor device according to claim 5, wherein the rotating shaft is a motor output shaft.