JPH09163711A - Motor, and electronic component installing equipment using the motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a rotor from displacing with respect to a stator, and eliminate rotor shaking, by extending a fixed magnetic pole as far as the position which a bolt penetrates. SOLUTION: As to a stator 6, a fixed magnetic pole 61 and a pair of holding part members 62 which clamps the fixed magnetic pole 61 from both of the upper and lower diections are fastened in a unified body by a bolt 64. As to a fixed magnetic pole 61, the outer edge is extended as far as the same position as the outer edge of the holding part member 62, so that the bolt 64 penetrates both the holding part member 62 and the fixed magnetic pole 61. When the bolt 64 so constituted that it penetrates the fixed magnetic pole 61, the pressing force generated by fastening the bolt 64 is applied straight to the fixed magnetic pole 61 along the lamination direction, so that the moment which is to bend the inner side of the holding part member 62 outside in the vertical direction is not generated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a fixed magnetic pole made of laminated steel plates and holding members arranged on both sides of the fixed magnetic pole in the stacking direction, and a stator having both holding members fastened to each other by bolts. The present invention relates to a motor and an electronic component mounting device using the motor.

[0002]

2. Description of the Related Art For example, according to Japanese Patent Laid-Open No. 6-334391, between a component supply station in which a plurality of types of electronic components are stocked and a component mounting station in which a board on which these electronic components are mounted is set. There is known an electronic component mounting apparatus arranged in. In this electronic component mounting apparatus, a rotary table that conveys electronic components from the component supply station to the component mounting station by intermittent rotation is provided, and a plurality of mounting heads are mounted on the rotary table. A plurality of suction nozzles that suck electronic components are attached to the mounting head, and a stepping motor that rotates the mounting head at a predetermined angle is configured around the mounting head so that any suction nozzle can be selected. ing. FIG. 5 shows the structure of a conventional stepping motor.

In FIG. 5, reference numeral 101 denotes a stator fixed to an arm (not shown) on the side of a rotary table, which allows a rotor 102 constituting a mounting head to freely rotate via a pair of upper and lower deep groove ball bearings 103. It is pivotally supported. Rotor 102
A pair of upper and lower permanent magnets 121 and rotating magnetic poles 122 made of laminated steel plates are alternately fitted so that magnetic poles of the same type face each other. In addition, 123 is a spacer ring, and the above-mentioned deep groove ball bearing 1 is provided through the spacer ring 123.
The permanent magnet 121 and the rotating magnetic pole 122 are sandwiched by 03. On the other hand, the stator 101 is composed of a fixed magnetic pole 111 made of laminated steel plates around which an exciting coil 112 is wound, and holding members 113 arranged on both sides in the vertical direction of the fixed magnetic pole 111, and a bolt 114 straddling both holding members 113. Being tightened by. Deep groove ball bearing 103 and holding member 11
A disc spring 115 is interposed between the disc spring 115 and the disc 3. Further, the holding member 113 is formed with an annular pressing portion 116 located inside the bolt 114, and the pressing portion 116 is formed.
The fixed magnetic pole 111 is pressed by both sides in the stacking direction.

[0004]

In such a conventional stepping motor as described above, since the holding portion 116 for directly exerting a pressing force on the fixed magnetic pole 111 is provided inside the bolt 114, the bolt 114 is provided. Although the pressing force is applied to the fixed magnetic pole 111 when tightened, the inside of the holding member 113, that is, the portion where the deep groove ball bearing 103 is held is vertically moved with the contact point between the pressing portion 116 and the fixed magnetic pole 111 as a fulcrum. It deforms in the direction that expands to both sides. Then, the holding state of the deep groove ball bearing 103 changes, causing a problem that the rotation axis of the rotor 102 is displaced.
The deviation of the rotation axis of the rotor 102 means that the suction nozzle is displaced in the thrust direction and the radial direction, which means that it becomes difficult to properly suck and mount electronic components. It should be noted that such a problem also occurs when a servo motor is used instead of the stepping motor.

The present invention has been made in order to solve the above-mentioned problems, and provides a motor in which the rotor is not displaced with respect to the stator and which does not rattle, and an electronic component mounting apparatus using the same. Its purpose is to provide.

[0006]

A motor according to a first aspect of the present invention comprises a fixed magnetic pole composed of laminated steel plates facing a rotor, and holding members arranged on both sides of the fixed magnetic pole in the laminating direction. In a motor having stators fastened to each other, a fixed magnetic pole is extended to a position where a bolt penetrates.

According to this structure, by extending the fixed magnetic pole to the position where the bolt penetrates, the pressing force applied from the holding member to the fixed magnetic pole by tightening the bolt is dispersed to the penetrating portion of the bolt, and this pressing force is applied. As a result, the other part of the holding member does not spread or narrow on both sides in the vertical direction, and is not displaced eccentrically.

In the motor of the second aspect, a pair of bearings for rotatably holding the rotor is provided between the rotor and the holding member, and one of the rotor and the holding member has an outer ring of each bearing. Alternatively, it is preferable to provide a pusher that presses one of the inner rings toward the steel ball.

According to this structure, by pushing either the outer ring or the inner ring to the steel ball side, rattling of the bearing itself is eliminated, and rattling between the rotor and the holding member is eliminated.

According to a third aspect of the invention, there is provided the electronic component mounting apparatus according to the first aspect.
Alternatively, in the electronic component mounting apparatus using the motor according to claim 2, the rotor is provided on a mounting head side that rotatably holds a suction nozzle that suctions an electronic component, and the stator conveys the mounting head. It is characterized in that it is provided on the carrier side.

According to this structure, the suction nozzle does not tilt or rattle up and down through the rotor, and the accuracy of the mounting position of the suction nozzle can be improved.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION A motor and an electronic component mounting apparatus according to an embodiment of the present invention will be described below with reference to the accompanying drawings. Referring to FIG. 1, reference numeral 1 denotes a component supply station, and a supply device 13 for supplying a plurality of types of electronic components for each type onto a component supply base 12 that is slidably positioned by a servo motor 11 supplies a component. They are arranged side by side in the sliding direction of the table 12. Further, 2 is a component mounting station, and a substrate 24 is placed on an XY table 23 which is positioned by the cooperation of two servo motors 21 and 22. A rotary table 3 which is intermittently rotated by a predetermined angle is arranged between the component supply station 1 and the component mounting station 2.

A plurality of mounting heads 31 are attached to the outer peripheral portion of the rotary table 3 at equal intervals by the predetermined angle via arms 3a described later.
Is indexed at the position indicated by I, the electronic component of a desired type is adsorbed, and the posture of the electronic component held while being indexed through the position indicated by II to the position indicated by III is not shown. After being detected by the sensor and correcting the posture of each component, the component is mounted on the substrate 24 at the position indicated by III.

As shown in FIG. 2, around the mounting head 31, the arm 3a on the rotary table 3 side and the mounting head 31 are provided.
And the stepping motor 4 is formed between and. A plurality of suction nozzles 32, which are positioned (selected) by the stepping motor 4, are attached to the mounting head 31 so as to be vertically movable. The suction nozzles 32 have different tip shapes, and are held at the rising ends by the claw members 33.

Then, while returning from the position indicated by III to the position indicated by I, the suction nozzle 32 corresponding to the type of electronic component to be held next is moved to the outside by the rotation of the stepping motor 4 and By the device outside the figure,
The claw member 33 is swung, the suction nozzle 32 is lowered to the lower end, and the other suction nozzles are raised and hooked on the claw member 33. Then, the pipe line opened in the suction nozzle 32 communicates with the suction port 34. The suction port 34 is connected to a vacuum generator (not shown) so that electronic components can be sucked onto the tip of the suction nozzle 32 that has descended.

As shown in FIG. 3, the detailed structure of the stepping motor 4 includes a pair of upper and lower rotors 5 each having a suction nozzle 32 and a claw member 33 attached to a stator 6 fixed to the rotary table 3 side. It is rotatably supported by an angular bearing 7. As with the conventional rotor shown in FIG. 5, two permanent magnets 51 and three rotating magnetic poles 52 are alternately fitted to the rotor 5. On the other hand, the stator 6
Is a fixed magnetic pole 61 similar to the conventional one shown in FIG.
A pair of holding members 6 that sandwich the fixed magnetic pole 61 from both sides in the vertical direction.
2 and 2 are fastened together by a bolt 64.

In this case, the fixed magnetic pole 61 of the embodiment shown in FIG. 3 has its outer edge extended to the same position as the outer edge of the holding member 62, so that the bolt 64 is held by the holding member 62.
At the same time, the fixed magnetic pole 61 is penetrated. The outer edge of the fixed magnetic pole 61 may be extended outward so that the bolt 64 penetrates the fixed magnetic pole 61 even if the outer edge of the fixed magnetic pole 61 does not coincide with the position of the outer edge of the holding member 62. When the bolt 64 is configured to penetrate the fixed magnetic pole 61 as described above, the pressing force generated by tightening the bolt 64 acts on the fixed magnetic pole 61 straightly along the stacking direction, and the inside of the holding member 62. There is no moment to expand the outside of the vertical direction. Further, a step portion is formed between the holding member 62 and the fixed magnetic pole 61, and the fixed magnetic pole 61 is formed.
The gap between the rotary magnetic pole 52 and the rotary magnetic pole 52 is accurately maintained.

In FIG. 3, 63 is a fixed magnetic pole 61.
It is an exciting coil that is wound around. Further, the angular bearing 7 is preloaded by a nut member (pusher) 72 screwed to the rotor 5 via a spacer ring 71. In this case, the nut member 72 is eccentric, and by adjusting the mounting angle of the nut member 72, the inner ring of the angular bearing 7 can be pressed without rattling to the steel ball side. This pressing is performed via the stator 6,
It also acts on the upper angular bearing 7 so that both angular bearings 7 do not rattle.

As a result, rattling of the angular bearing 7 in the thrust direction and the radial direction is prevented, that is, rattling of the suction nozzle is prevented. A deep groove ball bearing may be used instead of the angular bearing 7.

In the structure shown in FIG. 3, the angular bearing 7 is preloaded by the nut 72 screwed to the rotor 5, but as shown in FIG. 4, the holding member 6 on the stator 6 side is provided.
It may be performed by the pressing metal fitting 8 fastened to 2.
With this configuration, the nut 72 can be omitted, which is advantageous because the number of elements that cause imbalance in balancing the rotation of the rotor 5 is reduced.

In the present embodiment, the stepping motor 4 is formed between the arm 3a and the mounting head 31 around the mounting head 31, but a servomotor is used instead of the stepping motor 4. Good. In such a case, it goes without saying that the above structure can be applied to the servo motor.

[0022]

As described above, according to the motor and the electronic component mounting apparatus of the present invention, when the stator is fastened by the bolts, no moment is generated in the holding members sandwiching the fixed magnetic poles made of laminated steel plates, so that the rotor The axis of rotation does not shift. If the rotation axis is not displaced in this way, vibration does not occur even when rotated at high speed, and when applied to an electronic component mounting device, the position of the held electronic component does not vary and the electronic component is accurately Can be adsorbed and mounted on.

[Brief description of the drawings]

FIG. 1 is a plan view showing an outline of an electronic component mounting apparatus to which the present invention is applied.

FIG. 2 is a cross-sectional view showing a usage state of the stepping motor of the present invention.

FIG. 3 is a partial cross-sectional view showing the configuration of the stepping motor of the present invention.

FIG. 4 is a partial cross-sectional view showing another configuration of the stepping motor of the present invention.

FIG. 5 is a partial cross-sectional view showing the configuration of a conventional stepping motor.

[Explanation of symbols]

 1 Parts Supply Station 2 Parts Supply Station 3 Rotary Table 4 Stepping Motor 5 Rotor 6 Stator 7 Angular Bearing 31 Mounting Head 61 Fixed Magnetic Pole 62 Holding Member 63 Excitation Coil 64 Volt

Claims (3)

[Claims] 1. A stator comprising fixed magnetic poles made of laminated steel plates facing a rotor, and holding members arranged on both sides of the fixed magnetic poles in the stacking direction, the stator having the holding members fastened to each other by bolts. In the motor, the fixed magnetic pole is extended to a position where the bolt penetrates. 2. A pair of bearings for rotatably holding the rotor is provided between the rotor and the holding member, and one of the rotor and the holding member is provided with one of the bearings. The motor according to claim 1, further comprising a pusher that presses either the outer ring or the inner ring toward the steel ball. 3. An electronic component mounting apparatus using the motor according to claim 1, wherein the rotor is provided on a mounting head side that rotatably holds a suction nozzle that suctions an electronic component. The electronic component mounting apparatus, wherein the stator is provided on the side of a transfer device that transfers the mounting head.