JPH04178157A - Motor - Google Patents

Abstract

PURPOSE:To easily and surely perform the electric connection onto a circuit board of the coil terminal of a stator by supporting the terminal of the coil, on approximately the same level with the circuit board face, at the support provided in the projection. CONSTITUTION:This is equipped with a rotor 11, which has a rotary shaft 1 being born at the center and a driving permanent magnet 10 to generate magnetic force in radial direction and rotates integrally with the rotary shaft 1, and a stator 12, which is arranged outside the rotor 11 and on the iron cores 13 of which a plurality of coils 16 are wound to generate torque in the rotor 11 by the magnetic action with the driving permanent magnet 10, and further it is provided with a projection 17, which has the groove 17c as a holder to hold the terminal of the coil 6 on approximately the same level with the circuit board 6 face and is made of an electrically insulating material, such that it projects to the outer peripheral end of the iron core 13, and in the electric connection in the vicinity of the projection 17, the terminal of the coil 16 is electrically connected to the circuit board 6.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electric motor that rotates a recording medium of a magnetic recording device having a magnetic head for reading and writing magnetic recording signals on a recording medium such as a magnetic disk. This relates to electric motors that

[Prior art] As a conventional electric motor of this type, Utility Model Application No. 60-13586
The technology published in Publication No. 3 can be mentioned.

FIG. 10 is a longitudinal sectional view of a conventional electric motor, and FIG. 11 is a side view of the conventional electric motor.

In the figure, (31) is the rotating shaft located in the center, (
32) is a disk holding member that is fitted and fixed to the upper part of the rotating shaft (31), and the magnetic disk (3) is mounted on the upper disk mounting surface (32a). (33) is a drive pin provided on the outer periphery of the disk holding member (32) so as to be movable up and down by an elastic member, and is inserted into a window hole provided in the magnetic disk (3) to drive the magnetic disk (3). It is rotationally driven. (34) is a cylindrical bearing holder having a flange (34a) fixed to a frame (35), and supports the rotating shaft (31) by a bearing (36). A stator (38) having a donut-shaped iron core (37) is attached to the rotating shaft (31) on the outer periphery of the bearing holder (34).
This stator (38) is mounted concentrically with the frame (
Hold the flange (34) of the bearing holder (34) across the flange (35).
It is fixed to the outer periphery of a) with screws (39).

The iron core (37) of the stator (38) has a coil (4
The iron core (37) and the coil (40) are insulated by an insulating coating (41) made of synthetic resin coated on the outer surface of the iron core (37). (42) is a rotor attached to cover the outside of the stator (38), and a lid-shaped rotor yoke (43)
The center of the magnet is fixed concentrically to the rotating shaft (31) by a screw (44), and a driving permanent magnet (45) is arranged on the inner peripheral surface of the cylindrical part of the rotor yoke (43) and faces the stator (38) with a slight gap. ) is fixed. (46)
is an index detection element attached to the frame (35), and (47) is an index detection magnet attached to the outer peripheral surface of the rotor yoke (43) of the rotor (42), facing the index detection element (46). , an index detection mechanism is configured by these index detection elements (46) and index detection magnets (47),
Generates one pulse signal per rotation.

(48) and (49) are magnetic heads that read and write magnetic recording signals on both sides of the magnetic disk (3).
35) is configured to allow linear movement by a sliding member (52) that is slidable on a support shaft (51) fixed via a member (50).

This type of electric motor has a rotor (4) on the outside of the stator (38).
2) is called the outer rotor type.

Next, the operation of the conventional electric motor configured as described above will be explained.

Disc mounting surface (32a) of disc holding member (32)
When the magnetic disk (3) is set on the magnetic disk (3) and detected by a magnetic detection element (not shown), the coil (40) wound around the iron core (37) of the stator (38) is energized based on this. . On the other hand, the permanent magnet (45) for driving the rotor (42)
) generates magnetic force in the radial direction, and thus generates rotational torque in the rotor (42) through magnetic interaction with the stator (38). When the rotor (42) starts rotating, the rotating shaft (31) fixed to the rotor yoke (43) by the screw (44) also rotates together with the disk holding member (
A drive pin (33) attached to the magnetic disk (32) so as to be elastically movable up and down is inserted into the window hole of the magnetic disk (3) and applies rotational force to the magnetic disk (3). Further, the magnetic head (48) and the magnetic head (49) read and write magnetic recording signals through head windows on both sides of the magnetic disk (3) while moving linearly.

[Problem to be solved by the invention] A conventional electric motor is configured as described above, and has a rotor (42
) is outside the stator (38), so the magnetic disk (
A magnetic head (48) and a magnetic head (49) that move linearly in the radial direction with respect to a recording medium such as
) and cannot be arranged on the same plane as the rotor (42) and stator (38), which limits the ability to make the magnetic recording device thinner. Therefore, the rotor (42) is connected to the stator (3).
8) Inner rotor type electric motors are increasingly being used in magnetic recording devices.

However, when using this inner rotor type electric motor, when connecting the terminals of the coils wound around the stator core to the electrical circuit printed on the circuit board, the terminal lead wires tend to move and are held. However, electrical connections such as soldering must be made on a narrow circuit board, resulting in a reduction in work efficiency and accuracy.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an inner rotor type electric motor which can be made thinner and which can easily and reliably electrically connect the coil terminals of a stator to a circuit board.

[Means for Solving the Problems] The electric motor according to claim 1 has a rotating shaft pivotally supported in the center and a driving permanent magnet that generates magnetic force in the radial direction,
A rotor that rotates integrally with the rotating shaft; and a plurality of coils that are disposed outside the rotor and are wound around an iron core to generate rotational force in the rotor through magnetic interaction with the driving permanent magnet. and a stator that holds the end of the coil at approximately the same height as the circuit board surface, and further has a holding part that holds the terminal of the coil at approximately the same height as the circuit board surface, and has a protrusion made of an electrically insulating material that projects to the outer peripheral end of the iron core. The terminal of the coil is electrically connected to the circuit board near the protrusion.

An electric motor according to a second aspect of the present invention is one in which an engaging portion that engages with the circuit board and the protrusion portion according to the first aspect is provided.

[Function] In claim 1, the end of the coil is held by the holding portion provided on the protrusion at substantially the same height as the surface of the circuit board, so that the end of the coil can be easily and reliably electrically connected to the circuit board.

In the second aspect of the present invention, since the circuit board and the protrusion are provided with engaging portions that engage with each other, it is possible to easily and reliably position the electrical connection point of the coil terminal to the circuit board.

[Example] <First Example> First, a first example of the present invention will be described based on FIGS. 1 to 6.

FIG. 1 is a longitudinal sectional view of an electric motor according to a first embodiment of the present invention;
2 is a plan view of the motor according to the first embodiment of the present invention with the shield plate removed, FIG. 3 is a plan view of the main part of FIG. 2, and FIG. 4 is a partially enlarged plan view of FIG. 5 is a sectional view of FIG. 4 viewed from the outer circumferential side, and FIG. 6 is a sectional view of FIG. 4 viewed from the side.

In the figure, (1) is the rotating shaft located in the center, (2
) is a disk holding member that is fitted and fixed to the upper part of the rotating shaft (1), and a magnetic disk (3) is mounted on the upper disk mounting surface (2a).

(4) is a drive pin provided on the outer periphery of the disk holding member (2) so as to be movable up and down by an elastic member, and is inserted into a window hole provided in the magnetic disk (3) to drive the magnetic disk (3). It is rotationally driven. (5) is a cylindrical bearing holder whose lower part is fixed vertically to a hole drilled in the center of a flat metal circuit board (6).
supports the rotating shaft (1). (8) is a thrust stop attached to the end of the rotating shaft (1) on the side of the circuit board (6). Note that an electric circuit for driving the motor is provided on the upper surface of the circuit board (6) using printed wiring.

On the outside of the bearing holder (5), a ring-shaped rotor yoke (9) made of ferromagnetic metal is fixed and integrated with the lower part of a disk holding member (2) press-fitted into the rotating shaft (1). . (10) is a driving permanent magnet formed in a ring shape and attached to the outer peripheral surface of the rotor yoke (9). The rotor (1
1), and this rotor (11) rotates concentrically with the rotating shaft (1).

A stator (12) is disposed outside the driving permanent magnet (10) of the rotor (11) at a position facing the driving permanent magnet (10) with a small gap. (1
3) constitutes a stator (12), which has a notch (
13a), the entire core is coated with an insulating coating (14) made of synthetic resin.

The axial position of this iron core (13) is adjusted by a spacer portion (15) integrally formed with the insulating coating (14), and is fixed at a position concentric with the rotating shaft (1). Iron core (1
3), a coil (16) is wound around 15 consecutive iron core teeth obtained by dividing the inner circumference into 18 equal parts, and a coil (16) is wound around 15 consecutive iron core teeth obtained by dividing the inner circumference into 18 equal parts, and a coil (16) is wound around the inner diameter part of the notch (13a). Bridge portions (13b) corresponding to individual core teeth are formed. The coil (16) is a three-phase wiring consisting of three conductive wires that are continuously wound two by two around the iron core teeth.

(17) is a protrusion provided so as to protrude to the outside of the iron core (13), and is integrally molded with the insulating coating (14). The tip of this protrusion (17) has two protrusions (1
7a) is integrally formed, and this protrusion (17a)
) extends downward to form an engaging portion (17b), which is inserted into a hole (6a) drilled at a set position on the circuit board (6).

Further, a coil (
A groove (17c) slightly smaller than the end of the coil (16) holding the end of the coil (16) is formed parallel to and at approximately the same height as the circuit board (6).

That is, these insulating coatings (14), spacer parts (15)
), the protrusion (17) is integrally molded from synthetic resin.

(18) is a coil (
The terminal of 16) is an electrical connection part electrically connected to the circuit board (6) by soldering. Note that although Figures 4 to 6 show the terminal connection of one coil (16), the coil (16) as a whole is a three-phase wiring consisting of three conductors, so As shown in FIG. 3, there are three electrical connections (18).

(19) is a circuit board (
6) The index detecting element mounted above generates a signal of one pulse per revolution. (21) is a rotational speed detection surface (FG magnetized surface) magnetized on the lower surface of the disk holding member (2), which detects the rotational speed of the electric motor as a frequency.

(22) is attached to the outer periphery of the iron core (13) of the stator (12), covers the upper part of the stator (12), and
) is a shield plate that prevents magnetic flux generated from the armature from leaking to the magnetic disk (3), etc. (23), (2
4) is a magnetic head that reads and writes magnetic recording signals on both sides of the magnetic disk (3), and is attached to the circuit board (6) using a member (
A sliding member (27) that is slidable on a support shaft (26) fixed via a shaft (25) allows linear movement.

This type of electric motor has a rotor (12) inside a stator (12).
1) is called the inner rotor type.

Next, the operation of the electric motor of this embodiment configured as described above will be explained.

Set the magnetic disk (3) on the disk mounting surface (2a) of the disk holding member (2), and attach the driving permanent magnet (10).
When a magnetic detection element (not shown) detects the magnetic flux, the coil (16) wound around the iron core (13) of the stator (12) is energized based on this detection. On the other hand, the rotor (1
Since the driving permanent magnet (10) of 1) generates magnetic force in the radial direction, it generates rotational torque in the rotor (11) through magnetic interaction with the stator (12). And the rotor (1
1) starts to rotate, the rotating shaft (1) fixed to the disk holding member (2) also rotates, and the drive pin attached to the disk holding member (2) so as to be elastically movable up and down. (4) is inserted into the window hole of the magnetic disk (3) to apply rotational force to the magnetic disk (3). Further, the magnetic head (23) and the magnetic head (24) read and write magnetic recording signals through head windows on both sides of the magnetic disk (3) while moving linearly. The electric motor configured as described above has a magnetic head (23) and a magnetic head (24).
Since the rotor (11) and the stator (12) are arranged on substantially the same plane, the magnetic recording device can be made thinner.

Next, the terminal processing of the coil (16) will be explained based on FIGS. 3 to 6.

To process the terminals of the coil (16), first insert the two engaging parts (17b) extending below the protrusion (17) into the holes (6a) of the circuit board (6), and then , of the coil (
16) into the two grooves (17c) of the protrusion (17).
Press fit into. After the end of the coil (16) is press-fitted into the groove (17c) and held, the electrical connection (18) between the two protrusions (17a) is formed so that the coil is almost flush with the circuit board (6). (16) by soldering the terminal to the circuit board (
6) Make an electrical connection. At this time, since the terminal of the coil (16) is held by the protrusion (17), the position does not shift and soldering is easy, and the terminal of the coil (16) is held as in the conventional case. There's no need. This is 3
By following the main conductive wire, the terminal processing of the coil (16) is completed, and the coil (16) and the electric circuit on the circuit board (6) can be energized.

As described above, the electric motor of the above embodiment has a rotating shaft (1) that is pivotally supported in the center and a driving permanent magnet (10) that generates magnetic force in the radial direction. A rotor (11) rotates integrally with the rotor (11), and a plurality of coils (16) are arranged outside the rotor (11) and wound around an iron core (13) to create a magnetism between the drive permanent magnet (10) and the rotor (11). a stator (12) that generates rotational force in the rotor (11) by a mechanical action, and a terminal of the coil (16) is connected to a circuit board (6
) surface as a holding section (17c)
), and a protrusion (17) made of an electrically insulating material is provided to protrude from the outer peripheral end of the iron core (13), and at an electrical connection part (18) near the protrusion (17). The terminal of the coil (16) is electrically connected to the circuit board (6).

Therefore, according to the above embodiment, the end of the coil (16) is held in the groove (17c) provided in the protrusion (17) at approximately the same height as the circuit board surface (6), so that the end of the coil (16) is held at approximately the same height as the circuit board surface (6). The terminal can be electrically connected to the circuit board (6) easily and reliably.

Further, even after soldering, the terminal of the coil (16) is held by the protrusion (17), so it is difficult to come off.

<Second Embodiment> Next, a second embodiment of the present invention will be described based on FIGS. 7 to 9.

FIG. 7 is a plan view of essential parts of an electric motor according to a second embodiment of the present invention, FIG. 8 is a cross-sectional view of FIG. 7 viewed from the outer peripheral surface side, and FIG. 9 is a cross-sectional view of FIG. 7 viewed from the side. It is. In the drawings, the same reference numerals as in FIGS. 1 to 6 indicate parts that are the same as or correspond to the constituent parts of the first embodiment.

In the figure, (17) is a protrusion provided so as to protrude to the outside of the iron core (13), and is integrally molded with the insulating coating (14). The tip of this protrusion (17) has three square column-shaped engagement parts (17) extending downward at intervals.
d) are formed and inserted into three holes (6b) drilled at set positions on the circuit board (6), respectively. A groove (17e) slightly smaller than the end of the coil (16) that holds the end of the coil (16) is formed on the bottom surface of the engaging part (17d) of the protrusion (17). It is formed parallel to the radial direction at almost the same height as the radial direction. That is, this protrusion (17) is formed so as to hold three terminals of the coil (16) wired in three phases. Reference numeral (18) denotes an electrical joint where the terminal of the coil (16) is electrically joined to the circuit board (6) by soldering in the vicinity extending outward from the protrusion (17).

The motor of the second embodiment has the terminal of the coil (16) held by the protrusion (17) and soldered to the circuit board (6), so it has the same effect as the motor of the first embodiment. You can expect good results.

In particular, in this second embodiment, since the electrical joints (18) are provided on the outside of the protrusion (17), each electrical joint (
18) It is also possible to deal with cases where the spacing is narrow. However, in the first embodiment, the end of the coil (16) is held at two locations on both sides of the electrical joint (18), so it is more securely held in the specified position than in the second embodiment, which is held only on one side. can be held.

By the way, the protrusion in each of the above embodiments is an engaging part (1) inserted into a hole (6a) or a hole (6b) formed in a circuit board (6).
7b) and an engaging portion (17d), however, when carrying out the present invention, it is not necessarily limited to this, and the protrusion (17) and the magnetized iron core (13) are formed. After installing the coil (16) in a predetermined position, the protrusion (17)
It is not necessary to form it when it is possible to hold it.

Further, the protrusion (17) in each of the above embodiments is attached to the iron core (13).
an insulating coating (14) coated on the outside of the
Alternatively, although it is integrally molded with the spacer part (15), when implementing the present invention, the protrusion part (17) is made as a separate piece of the same or different material, and the present invention is not limited to this. It is also possible to join by various joining means.

Furthermore, although the protrusion (17) of the first embodiment has two protrusions (17a) formed at the tip, when implementing the present invention, the present invention is not limited to this. It is also possible to form only one piece.

Then, the engaging portion of the protrusion of each of the above embodiments and the circuit board (
The holes 6) may have any shape as long as they engage with each other.

[Effect of the invention] As described above, the electric motor of the invention of claim 1 has a rotating shaft,
A rotor, a stator disposed outside the rotor and having a plurality of coils wound around an iron core, and further comprising a holding part that holds the terminals of the coils at approximately the same height as the circuit board surface A protrusion made of an electrically insulating material is provided to protrude from the outer peripheral end of the iron core, and the terminal of the coil is electrically connected to the circuit board near the protrusion.

Therefore, since the end of the coil is held by the holding portion provided on the protrusion at substantially the same height as the surface of the circuit board, the end of the coil can be easily and reliably electrically connected to the circuit board.

The electric motor of the invention of claim 2 has, in addition to the effect of claim 1,
Since the circuit board and the protrusion are provided with engaging portions that engage with each other, the electrical connection point of the coil terminal to the circuit board can be easily and reliably positioned.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of an electric motor according to a first embodiment of the present invention;
2 is a plan view of the motor according to the first embodiment of the present invention with the shield plate removed, FIG. 3 is a plan view of the main part of FIG. 2, and FIG. 4 is a partially enlarged plan view of FIG. Figure 5 is a sectional view of Figure 4 viewed from the outer circumference, Figure 6 is a sectional view of Figure 4 viewed from the side,
FIG. 7 is a plan view of essential parts of an electric motor according to a second embodiment of the present invention, FIG. 8 is a cross-sectional view of FIG. 7 viewed from the outer peripheral surface side, and FIG. 9 is a cross-sectional view of FIG. 7 viewed from the side. , FIG. 10 is a longitudinal sectional view of a conventional electric motor, and FIG. 11 is a side view of the conventional electric motor. In the figure, 1: Rotating shaft 6 Two circuit boards 10: Driving permanent magnet 11: Rotor 12: Stator 13: Iron core 16: Coil 17: Protrusions 17b, 17d: Engaging parts 17c, 17e: Groove 18: Electricity It is a joint. In the drawings, the same reference numerals and the same symbols indicate the same or equivalent parts. Agent: Patent attorney: Masuo and 2 others Fig. 3 18: Electrical joint t5ba T/l) 17C17b6a≧1

Claims (2)

[Claims] (1) A rotating shaft that is pivotally supported in the center, a rotor that has a driving permanent magnet that generates magnetic force in the radial direction and rotates integrally with the rotating shaft, and a rotor that is disposed outside of the rotor. a stator having a plurality of coils wound around an iron core to generate rotational force in the rotor through magnetic interaction with the driving permanent magnet; and a stator provided so as to protrude from an outer peripheral end of the iron core, the coil the terminal of the coil is electrically connected to the circuit board in the vicinity of the protrusion, the protrusion being formed of an electrically insulating material; An electric motor characterized in that it is equipped with an electrical connection part. (2) The electric motor according to claim 1, wherein the circuit board and the protrusion have engaging portions that engage with each other.