JP2513595Y2 - Detector coupling device - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coupling structure for attaching a rotational position detector to a shaft end outside a bracket of an AC synchronous motor.

[0002]

2. Description of the Related Art In a control using a servo motor, it is necessary to accurately detect a rotor magnetic pole position during control in order to accurately detect a control amount. For this reason, a photoelectric or electromagnetic position detector (encoder) for detecting the rotation angle is coupled to the end of the rotation shaft of the motor. As shown in FIG. , A rotary disk 12 provided on a hollow shaft 11 attached to the motor rotary shaft 1 and a detection element provided on a detector frame 14 connected to the detector mounting seat 3 of the bracket 2 via a leaf spring 13 for mounting, for example, a photo A light emitting element provided on the substrate 17 via the diode 15 and the arm 16, for example a light emitting diode 18, is provided, and the light emitting element 18 and the detection element 15 are provided.
The rotating disk 12 is arranged between the two, and the light from the light emitting element 18 is received by the detecting element 15 via the light-transmitting slit provided in the rotating disk 12, and is converted into a pulse for counting.

However, in the synchronous machine, the stator magnetic pole 5
Position and the slit position of the detector must be matched
Therefore, when the rotating side of the position detector 10 and the motor rotating shaft 1 are coupled, the assembled motor is excited to keep the rotor magnetic pole 5 aligned with the reference position of the stator 4, The stopper 6 is fitted to the portion of the rotary shaft 1 which is projected outward from the bracket 2, and the protrusion 7 projected from the stopper 6 is adjusted so as to be aligned with the rotor magnetic pole position. The protrusion 7 is fixed, and the notch 19 provided on the end face of the position detector 10 on the rotation side, for example, the end face of the hollow shaft 11 is fitted to position the rotary disk 12, and the hollow shaft 1
1 is fixed to the motor rotating shaft 1 with a bolt 20.

In this way, after connecting the rotation side of the position detector, the fixed side of the position detector 10 is rotated,
As shown in FIG. 7, the mark of the leaf spring 13 for mounting, for example, the notch 21 is aligned with the mark 8 which is aligned with the reference position of the stator provided on the detector mounting seat 3 of the bracket 2 and is screwed. It is fixed at 22 so as to be coupled. In addition, the actual development number 63-135220 is
Make the bush of the rotary slit plate of the
By providing a flat surface parallel to the axis on the
A mounting device is shown that presses the screw against the flat surface.
It

[0005]

As described above, the stopper 6 for positioning the rotation side of the position detector 10 has a large diameter because it is fitted to the motor rotating shaft, and is fitted to the rotating shaft 1 after the motor is assembled. I try to fix it. For this reason, it is necessary to determine the position of the protrusion 7 and fix it to the motor rotating shaft 1 in a state where the motor is excited to match the position of the rotor magnetic pole 5 with the reference position of the stator. Therefore, it takes a lot of time to attach the stopper 6, the setup time for attaching the position detector 10 becomes long, and the position detector 1
On the fixed side of 0, the notch 21 of the mounting leaf spring 13 is visually aligned with the mark 8 of the detector mounting seat 3,
The alignment was troublesome. Also, on the flat step of the rotary shaft
If the detector is attached with a push screw, the tip of the push screw
Since it is positionally connected to the rotary shaft only by the point contact of
The tightening position of is unstable in the circumferential direction,
It is necessary to accurately align the slit position with the magnetic pole position.
If it does, the certainty is not sufficient.

[0006]

SUMMARY OF THE INVENTION In view of the above-mentioned drawbacks, the present invention has an axial hole formed on a side surface of a stepped portion on a shaft end side of a bearing fitting portion in a motor rotating shaft and a position of the axial hole. The hollow shaft of the position detector is provided with a positioning pole facing the axial hole of the rotary shaft, and the rotor disc is mounted by aligning the origin position with this hole position. By connecting the direction hole and the positioning hole to each other with a pin, the rotating side of the position detector is positionally coupled to the rotor magnetic pole at a predetermined mounting angle.

Further, a radial hole formed in a small diameter portion of the motor rotating shaft on the shaft end side of the bearing fitting portion, an insertion piece inserted into the radial hole and lower than the bearing fitting portion, and the insertion piece. The rotor shaft installed in accordance with the position of, the hollow shaft is provided with a notch groove to be fitted to the insert piece, and a rotary disk installed in accordance with the notch groove position, It is also possible to perform positioning connection by fitting the cutout groove.

In still another configuration, a cutout provided on the side surface of the stepped portion on the shaft end side of the bearing fitting portion and a rotor magnetic pole attached to the cutout position are attached to the motor rotating shaft. In addition, the hollow shaft is provided with a protrusion that fits into the notch and a rotary disk that is attached to match the position of the protrusion, and the protrusion and the notch are fitted together for positioning and coupling.

The fixed side of the position detector is provided with a protrusion having a reference surface which is aligned with the reference position of the stator on the detector mounting seat of the bracket, and the fixed side of the position detector is provided with a reference surface of the protrusion. A mounting leaf spring with an abutting notch surface and a detection element that matches the position of this notch surface are attached, and the notch surface of the mounting leaf spring is used as the reference surface of the protrusion. They are pressed against each other, positioned, and joined together.

[0010]

EXAMPLE An example shown in the drawings will be described below. 1 and 2 show an embodiment of the present invention, in which the same parts as those in FIGS. 5 and 6 described above are designated by the same reference numerals.
Reference numeral 23 is an axial hole provided on the stepped portion side surface 9 on the shaft end side of the bearing fitting portion 1a of the motor rotary shaft 1, which is machined when the motor rotary shaft 1 is manufactured and rotated according to the position of the axial hole. The child magnetic pole 5 is attached. 24 is a hollow shaft 11
A positioning hole provided on the end surface of the rotary disk 12 so as to face the axial hole 23, which is machined when the hollow shaft is manufactured, and the origin position is aligned with the position of the positioning hole 24.
Is installed. Reference numeral 25 denotes a pin fitted into the axial hole 23 and the positioning hole 24, which can be fixed in advance to one of the holes. Numeral 26 is a positioning projection that is projected from the end surface of the detector mounting seat 3 provided on the bracket 2, and one side surface in the circumferential direction thereof is used as a reference surface 27 for the stator 4.
It is adjusted to the reference position of. Reference numeral 28 is a notch provided in the mounting leaf spring 13, and 29 is a notch surface of the mounting leaf spring 13. The light emitting element 18 and the detecting element 15 mounted on the fixed side of the position detector 10 have their mounting positions adjusted in advance with the position of the cutout surface 29 of the mounting leaf spring 13 as the reference position of the stator. The bracket 2 is assembled according to the winding position of the stator 4, and the reference surface 27 of the positioning protrusion 26 provided on the detector mounting seat 3 is fixed to the stator 4.
In the stator 4, the protrusions on the outer periphery of the iron core are fitted in the grooves of the frame so as not to shift in the circumferential direction.

Therefore, when the rotating side of the position detector 10 is connected to the motor rotating shaft 1, the hollow shaft 11 is inserted into the motor rotating shaft 1 after the motor is assembled.
By fitting the positioning hole 24 of the hollow shaft 11 into the pin 25 that is inserted and fixed in the axial hole 23, the rotary disk 12 and the rotor magnetic pole 5 can be aligned, and the bolt 20 rotates the hollow shaft 11 to a motor. It may be fixed to the shaft 1. The pin 25 can be inserted into the positioning hole 24 and fixed. In addition, the position detector 10
After fixing the hollow shaft 11 to the motor rotating shaft 1, the fixed side of the detector frame 14 is attached to the leaf spring 1 for mounting.
The notch surface 29 of 3 can be rotated until it hits the reference surface 27 of the positioning protrusion 26 of the detector mounting seat 3 and pressed to match the reference position of the stator, and in this state, tighten with the screw 22. .

FIG. 3 is a side sectional view of an essential part showing another construction. A radial hole 32 is formed in a small diameter portion 31 on the shaft end side of the bearing fitting portion 1a of the motor rotating shaft 1 for manufacturing the motor rotating shaft. An insertion piece 33 that is processed at this time and is inserted and fixed in the radial hole 32 is provided. The insertion piece 33 may be projected on one side of the small diameter portion 31 or may penetrate the small diameter portion, but the length of the protruding portion is made shorter than that of the bearing fitting portion 1a. Rotor magnetic pole 5
Are assembled according to the position of the insertion piece 33.
Reference numeral 34 denotes a notch groove provided on the end surface of the hollow shaft 11 of the position detector, into which the insert piece 33 is fitted, and the rotary disk 12 is attached in accordance with the position of the notch groove 34. Since the insertion piece 33 attached to the motor rotating shaft 1 is lower than the bearing fitting portion 1a, it does not hinder the assembly of the motor, and the position detection is performed at the shaft end of the motor rotating shaft 1 after the motor is assembled. Hollow shaft 1 of container 10
1 is inserted and the notch groove 34 on the end face is fitted into the insert piece 33, so that the rotary disk 12 and the rotor magnetic pole 5 are coupled with each other at the same angular position. The fixed side of the position detector can be operated in the same manner as described with reference to FIGS. 1 and 2.

FIG. 4 and FIG. 5 are side sectional views showing still another structure and a perspective view of a part thereof, showing a step between the bearing fitting portion 1a of the motor rotating shaft 1 and the small diameter portion 31 on the shaft end side. Attachment side 9
At the time of manufacturing the motor rotation shaft, a radial notch 35 is provided, and the rotor magnetic pole is attached in accordance with the position of the notch. The end face of the hollow shaft 11 is provided with a protrusion 36 protruding in the axial direction, and the rotary disc 12 is attached in accordance with the position of this protrusion. After the motor is assembled, the protrusion 36 of the hollow shaft 11 is attached to the rotary shaft 1 of the motor. By inserting it into the notch 35 and positioning and fixing the rotor magnetic pole and the rotating disk, the rotational side positioning coupling of the position detector is performed. The structure shown in FIGS. 1 and 2 can be used for the fixed side of the position detector.

[0014]

As described above, according to the present invention, on the rotation side of the position detector, the axial hole 23 is provided in advance on the side surface 9 of the stepped portion on the shaft end side of the bearing fitting portion of the motor rotary shaft 1. The rotor magnetic poles 5 are attached according to the positions of the axial holes, the hollow shaft 11 of the position detector 10 is provided with the positioning holes 24 facing the axial holes, and the rotary disk 12 attached according to the positions of the positioning holes. Provide and pin 2 in both holes
5 are fitted to be connected to the motor rotating shaft 1 at a predetermined angular position. Therefore, it is easy to align the mounting angle between the hollow shaft of the position detector and the motor rotating shaft, and the axial hole, the positioning hole, and the pin for positioning are provided in a portion having a smaller diameter than the bearing fitting portion. ,
Even if pre-processed when manufacturing the rotor, it does not hinder the fitting of the bearing and the assembly of the bracket.Before assembling the motor, adjust the rotor magnetic poles and the rotor magnetic poles according to the positions of the axial hole and the positioning hole. Since the rotating disk is attached, the number of steps for determining the magnetic pole position when the position detector is coupled can be saved, and the coupling can be performed accurately in a short time. In addition,
If the pin 25 is fixed to one of the axial hole 23 and the positioning hole 24 in advance to form a protrusion and is fitted into the other hole, the connection can be further simplified.

Further, a radial hole 32 is provided in the small diameter portion 31 on the shaft end side of the bearing fitting portion of the motor rotary shaft 1 to insert the insertion piece 33.
The same effect as described above can be obtained by fitting and fixing the insertion piece 33, making the height of the insertion piece 33 lower than that of the bearing fitting portion, and providing the notch groove 34 that fits the insertion piece on the end surface of the hollow shaft. Therefore, the insertion piece can be enlarged to increase the coupling strength between the motor rotating shaft 1 and the hollow shaft 11.

A radial cutout 35 and a projection 36 provided on the hollow shaft are fitted to the side surface 9 of the stepped portion on the shaft end side of the bearing fitting portion 1a of the motor rotary shaft 1 for positioning. The effect is that the number of parts can be reduced.

Further, on the fixed side of the position detector, a positioning projection 26 having a reference surface 27 aligned with the stator reference position is provided on the end surface of the detector mounting seat of the bracket, and a mounting leaf spring provided on the position detector is provided. Since the notch surface 29 of 13 is made to abut against the reference surface 27 of the positioning protrusion 26, it is not necessary to visually perform the alignment when fixing the detector frame, and the notch surface 29 It suffices to press it against the side surface of the detector mounting seat and fix it with screws, which has the effect of facilitating the mounting work and ensuring the alignment.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an embodiment of the present invention.

FIG. 2 is a perspective view showing a part of FIG.

FIG. 3 is a side sectional view showing a main part of another embodiment.

FIG. 4 is a side sectional view showing a main part in still another embodiment.

5 is a partial perspective view of the motor rotating shaft in FIG.

FIG. 6 is a side sectional view showing a conventional example.

FIG. 7 is a partial front view taken along the line AA of FIG.

[Explanation of symbols]

 1 Motor rotating shaft 1a Bearing fitting part 3 Detector mounting seat 5 Rotor magnetic pole 6 Stopper 9 Stepped part side surface 10 Position detector 11 Hollow shear
Shift 12 Rotating disc 13 Mounting plate
Right14 detector frame 15 Detection element 17 board 18 Light emitting element  23 Axial hole 24 Positioning hole 25 Pin 26 Positioning protrusion
Origin 27 Reference surface 28 Notch 29 Notch surface 32 Radial hole 33 Insert piece 34 Notch groove 35 Notch 36 Protrusion

Claims (4)

(57) [Scope of utility model registration request] 1. A coupling device for mounting a position detector on an outer surface of a bracket of an AC synchronous motor, wherein an axial hole 22 is provided on a side surface 9 of a stepped portion on a shaft end side of a motor rotating shaft 1 from a bearing fitting portion. , The rotor magnetic pole 5 attached in accordance with the axial hole position is provided, and the motor rotation of the position detector 10 is performed.
A hollow shaft 11 which is fitted into the rotating shaft, a positioning hole 24 facing the axial bore, the position of the positioning holes
A detector coupling device, characterized in that a rotary disk (12) fitted with slit positions is provided and a pin (25) for connecting the axial hole (23) and the positioning hole (24) is provided. 2. A coupling device for mounting a position detector on the outer surface of a bracket of an AC synchronous motor, wherein a radial hole 32 is provided in a small diameter portion 31 on a shaft end side of a bearing fitting portion in a motor rotating shaft 1. the insert piece 33 lower than the bearing fitting part and insert secured to the radial hole, the magnetic poles of the rotor 5 mounted to fit the insert position is provided, the position detector 10 Mo
The hollow shaft 11 to be fitted to the rotary shaft of the rotor is provided with the notch groove 34 to be fitted to the insertion piece 33 and the rotary disk 12 attached with the slit position aligned with the notch groove position. Characteristic detector coupling device. 3. A coupling device for mounting a position detector on an outer surface of a bracket of an AC synchronous motor, wherein a radial cutout is provided on a motor rotating shaft 1 on a stepped portion side surface 9 on a shaft end side of a bearing fitting portion. a technique 35, provided with a rotor pole 5 mounted to fit the notch skill position, the position detector 10
On the hollow shaft 11 fitted to the motor rotation shaft, the projection 36 fitted to the notch 35 and the slide position at this projection position .
A detector coupling device, comprising a rotating disk 12 mounted so that its lit position is aligned. 4. A coupling device for mounting a position detector on the outer surface of a bracket of an AC synchronous motor, wherein a positioning projection 26 having a reference surface 27 aligned with a stator reference position is provided on an end surface of a detector mounting seat 3 of the bracket. Position detector 10
The mounting leaf spring 13 having a notch surface 29 that abuts the reference surface 27 of the positioning protrusion on the fixed side of the light emitting element 18, and the light emitting element 18 that is attached according to the position of the notch surface 29.
And a detection element 15 are provided.