JPH1141896A - Motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a motor by which a signal for the detection of the rotating phase of a rotor is obtained with good efficiency, by a method wherein a magnet which is used to generate a magnetic field for the detection of the rotating phase of the rotor is provided, and a wiring board which receives the magnetic field from the magnet whenever the rotor is turned and which generates the signal for the detection of the rotating phase of the rotor is provided. SOLUTION: A PG magnet 110 for the detection of the rotating phase of a rotating-phase detecting device 100 is faced with a PG coil 120 whenever it is turned. Then, by a board rise part 32 and by a PG coil formation part (a wiring board) at the PG coil 120, one magnetic field is received by a coil pattern at the PG coil 120 per rotation from the PG magnet 110. In this manner, the PG magnet 110 senses one magnetic field with reference to the PG coil 120 whenever a rotor case 10 makes one rotation by the PG coil formation part, and a signal for the detection of the rotating phase is generated. As a result, a PG output can be taken out with good efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor, and more particularly to an improvement in a motor used for rotating a rotary drum of a rotary magnetic head device of a video tape recorder.

[0002]

2. Description of the Related Art For example, a conventional so-called iron-core cylindrical drum motor shown in FIGS. 12 and 13 has a stator 1000, a rotor 1001, a shaft 1002 and the like.
The rotor 1001 of the motor shown in FIG.
(Phase Gene)
(rating) 1003 is provided. The magnetic field of this magnet 1003 is
, The chip-shaped inductor 1004 is connected to the stator substrate 1005 of the stator 1000.
Is mounted by soldering.

In the motor shown in FIG. 13, a similar magnet 1003 for detecting a rotational phase is arranged on a rotor 1001. The stator substrate 1005 of the stator 1000 itself is a printed circuit board or a flexible printed circuit board.
0 is stuck on the iron-based substrate 1006. A coil pattern is formed on the stator substrate 1005, and the coil pattern receives a magnetic field of the magnet 1003. However, this coil pattern is a coil pattern that is parallel to the magnetic field from the magnet 1003.

[0004]

However, in the conventional motor shown in FIG. 12, a relatively large separate chip-shaped inductor must be mounted on the stator substrate 1005 by soldering. Connect. In the motor shown in FIG. 13, the coil pattern cannot receive the magnetic field from the magnet 1003 in the vertical direction, so that it is very inefficient to generate an output (PG output) for detecting the rotational phase. Further, since the coil pattern is wound in multiple layers to receive the magnetic field from the magnet 1003, the cost is increased and a complicated structure is required. Therefore, an object of the present invention is to solve the above-mentioned problems and to provide a motor that can efficiently obtain a signal for detecting a rotational phase of a rotor.

[0005]

According to the present invention, there is provided a stator having a magnetic substrate, a stator having a substrate rising portion, and a stator rotatable by the stator. A magnet for generating a magnetic field for detecting the rotation phase of the rotor, which is set in the rotor, and a magnet which is disposed with respect to the substrate rising portion so as to face the magnet. And a wiring board that generates a signal for detecting the rotation phase of the rotor in response to a magnetic field from the motor.

In the present invention, the stator has a stator substrate made of a magnetic material. The rotor is rotatable with respect to this stator. The magnet is set on the rotor and generates a magnetic field for detecting the rotational phase of the rotor. The wiring board is arranged on a substrate rising portion of the stator substrate, and receives a magnetic field from a magnet every time the rotor rotates, and generates a signal for detecting a rotation phase of the rotor. As a result, the wiring board faces the rotating magnet, so that it can efficiently receive the magnetic field from the magnet, and the cost can be reduced because the wiring board only needs to be arranged at the substrate rising portion. Can be achieved.

[0007]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. Note that the embodiments described below are preferred specific examples of the present invention,
Although various technically preferable limits are given, the scope of the present invention is not limited to these modes unless otherwise specified in the following description.

FIG. 1 is a perspective view showing a preferred embodiment of the motor of the present invention, and FIG. 2 is a sectional view showing an example of the internal structure of the motor of FIG. The motor M is a so-called drum motor of an iron core (cylindrical) type, and can be used, for example, for rotating a rotary drum of a rotary magnetic head device used in a video tape recorder (VTR). . This rotating magnetic head device has a rotating drum and a fixed drum, and the rotating drum is provided with a magnetic head. The magnetic head records information on a magnetic tape and reproduces information on the magnetic tape. be able to.

The motor M shown in FIGS. 1 and 2 has a rotor R and a stator S. The rotor R can rotate continuously with respect to the stator S, for example, in the T direction. The rotor R has a cup-shaped or cylindrical rotor case 10. The rotor case 10 has a driving magnet 12 on its inner peripheral surface. The driving magnet 12 has an N pole and an S pole that are multipolar magnetized along the circumferential direction. The rotor case 10
The boss 14 is fixed to the shaft 16.
Next, the stator S has a stator substrate 20, and a cylindrical portion 22 is attached to the stator substrate 20. The cylindrical portion 22 rotatably supports the shaft 16 via bearings 24, 24. Flexible printed circuit board (wiring board) on the top side of stator board 20
26 are arranged. The shaft 16 is fixed to a rotating drum 210 of the rotating magnetic head device 200. When the rotor R rotates, the rotating drum 210
Rotate against. The rotating drum 210 has the magnetic head 23
It has 0.

FIG. 3 shows an example of the shape of the stator board 20 and the shape of the flexible printed board 26. The stator substrate 20 is a metal substrate such as an iron plate, for example. The stator substrate 20 is substantially ring-shaped as shown in FIG. 3, but is characterized in that a part thereof is cut out and a substrate rising portion 32 is formed. The board rising section 32 is formed by cutting two places from the outer peripheral side along the radial direction of the stator board 20 and then standing up. Therefore, the plane direction of the substrate rising portion 32 is substantially along the circumferential direction of the stator substrate 20.

As shown in FIGS. 1 and 3, the height H of the substrate rising portion is, for example, substantially equal to or slightly smaller than the height of the rotor case 10 in the axial direction. In the stator S, the drive coil 30 and the iron core 38 are fixed to the cylindrical portion 22 as shown in FIG. A plurality of the driving coils 30 are set along the circumferential direction.
Each drive coil 30 faces the drive magnet 12 at a predetermined interval. When the drive coil 30 is energized from the outside, the magnetic field generated by the drive coil 30 and the magnetic field of the drive magnet 12 act alternately, so that the rotor case 10 of the rotor R moves around the shaft 16. It can rotate in the T direction with respect to the stator S.

Next, a description will be given of the rotation phase detecting device 100 of the rotor case (drum) set in the motor M with reference to FIGS. This rotation phase detection device 100 is a PG magnet (Phase Genera).
(Ting magnet) 110 and a PG coil 120. The PG magnet 110 has a rotor R
One or more are set for the outer peripheral surface 10 a of the rotor case 10. In the example of FIG. 1, one PG magnet 110 is set. The PG coil 120 is fixed, for example, by being wound around the substrate rising section 32 described above. This PG coil 120
Are adapted to receive the magnetic field from the PG magnet 110 in the substrate rising section 32 raised in a direction perpendicular to the magnetic field. That is, the PG coil 120 is configured by a coil pattern of a flexible printed circuit board, and the PG coil 120 has a shape as shown in FIGS. The flexible printed board 26 in FIG. 3 is set slightly smaller than the shape of the stator board 20, and has a ring-shaped portion 26a, a connecting portion 26b, and a PG coil forming portion 26c. PG coil forming section 26
c protrudes from the outer peripheral portion of the ring-shaped portion 26a and is substantially L-shaped. The connecting portion 26b is also formed to protrude in the radial direction from the outer peripheral portion of the ring-shaped portion 26a, and as shown in FIG.
Are electrically connected to the external control device 700 by using the connection unit 26b.

FIG. 4 and FIG.
As shown in the figure, the first part 130, the second part 140, the third part
A first portion 130, a second portion 1
40, the third portion 150 is a fold line 15 indicated by a broken line.
3,155 can be bent. In the first portion 130, a connection terminal 131 and a wiring portion 132 thereof are formed. The second portion 140 has a connection portion 133 for connecting the first portion 130 and the third portion 150, and the third portion 150 has a connection terminal 145.

The connection terminal 131, the connection portions 132, 133 and the connection terminal 145 of the PG coil forming section 26c shown in FIGS. 4 and 6 constitute the PG coil 120. Such a PG coil forming section 26c is fixed while being wound around the substrate rising section 32 shown in FIG. 3 in a procedure as shown in FIGS. 7 to 11, for example.

Next, referring to FIG. 7 to FIG.
An example of a procedure for winding and fixing the coil forming portion 26c around the substrate rising portion 32 will be described. The flexible printed circuit board 26 is previously attached to the upper surface of the stator substrate 20 with an adhesive layer on the back surface as shown in FIGS. The substrate starting portion 32 has already been formed from the stator substrate 20. The connection portion 26 b of the flexible printed board 26 projects outward from the outer peripheral portion of the stator board 20. As shown in FIG. 7, the PG coil forming portion 26c is bent in advance so as to overlap the ring-shaped portion 26a of the flexible printed circuit board 26 so as to avoid the substrate rising portion 32.

Next, the PG coil forming section 26c is shown in FIG.
The substrate is raised so as to be in close contact with the inner surface 32a of the substrate rising portion 32 as shown in FIG. Thus, the first portion 130 of the PG coil forming portion 26c is attached to the inner surface 32a by the adhesive layer on the back surface. In this state, the second part 140 and the third part 150 are in a state of protruding to the side (left side in FIG. 8) of the substrate rising part 32.

As shown in FIG. 9, the PG coil forming section 26
c in the W direction (counterclockwise as viewed from above)
The second portion 140 through the adhesive layer on the back surface.
Is adhered to the surface 32b of the substrate rising portion 32. In this state, the third portion 150 protrudes to the side of the substrate rising portion 140 (the right side in FIG. 9).

As shown in FIG. 10, the third portion 150 is
Winding in the direction (counterclockwise), the adhesive layer on the back surface of the third portion 150 is attached onto the first portion 130 on the inner surface 32 a of the substrate rising portion 32. After attaching the first portion 130, the second portion 140, and the third portion 150 to the substrate rising portion 32 via the adhesive layer in this manner, the connection terminals 131 and 145 shown in FIGS. Are electrically connected by soldering. Thereby, the PG coil 12
0 is set for the substrate start-up unit 32. Thus, the connection terminals 131 and 145 correspond to so-called soldered portions.

The completed PG magnet 110 of the rotational phase detecting device 100 of FIG. 1 can face each time it rotates with respect to the PG coil 120. That is, the substrate start-up portion 32 of the iron-based stator substrate that has started up, and the PG coil forming portion 26 of the PG coil 120 having the coil pattern.
As a result, a PG structure (rotational phase signal generation structure) on the stator S side is completed, and a magnetic field is generated once per rotation from the PG magnet 110 by a coil pattern of the PG coil 120 formed so as to be orthogonal to the magnetic field. As a result, it is possible to provide a magnetic circuit structure in which the magnetic field from the PG magnet 110 is less likely to leak to the outside by the iron-based substrate rising portion 32 that has been further raised.

By the way, each time the rotor case 10 makes one rotation, the PG magnet 110 is
A signal for the rotation phase can be generated by sensing the magnetic field once for 0. The reason for this is to detect the rotation phase (position in the rotation direction) of the rotor case 10 of the rotor R in FIG. 2 and the magnetic head 230 of the rotating drum 210 that rotates integrally with the rotor case 10.

Referring to FIG. 5, the flexible printed circuit board 26 of the present invention is electrically connected to the external control device 700 at the connection section 26b as described above. The wiring pattern of the flexible printed board 26 may be configured as follows. As described above, the flexible printed circuit board 26 includes the PG coil 120 constituting the rotational phase detecting device 100 shown in FIG. Part 5
00 etc. can be formed simultaneously.

The frequency generating coil pattern section 400
For example, a predetermined number of frequencies can be generated during one rotation of the rotor case 10 by receiving a magnetic field from a frequency generating magnet 410 provided on the rotor case 10 of the rotor R shown in FIG. That is, the frequency generating coil pattern unit 400 is configured to output the FG pattern (Freqen).
cy Generating pattern).
The frequency is generated in this manner by the rotor R of the motor M.
This is to detect the rotational position accuracy of the rotary drum 210 of the rotary magnetic head device 200. The magnet 410
May be added by other components, or may be magnetized on the end face of the driving magnet (main magnet) 12. FIG. 2 shows the latter case.

The energizing coil pattern section 500 is a pattern for supplying a driving current to each driving coil 30 of the stator S at a predetermined timing. As described above, the flexible printed circuit board 26 can also serve as a coil pattern portion for frequency generation and current supply, in addition to the function of the PG coil 120. As described above, in the embodiment of the present invention, a part of the iron-based substrate on the stator S side for receiving the magnetic field from the PG magnet 110 is replaced with the substrate start-up section 32.
Up so as to be perpendicular to the magnetic field direction of the PG magnet 110. In the above-mentioned substrate launching section 32,
A flexible printed board provided with a coil pattern for receiving a magnetic field from the PG magnet 110 is wound using an adhesive tape on the back surface of the board. The coil pattern of the flexible printed board is completed as a coil by soldering a joint between a first part wound around the board and a last part wound around the board. The flexible printed circuit board also uses other functions of the drum motor (the FG pattern, the lead wire of the motor driving coil).

With the PG structure (rotation phase detection signal generation structure) according to the above description, the magnetic field from the PG magnet provided on the rotor of the iron-core (cylindrical) drum motor is raised in the direction perpendicular to the PG magnet. The output generated and received by the coil pattern of the flexible printed circuit board wound around is used as a signal for detecting the rotational phase of the rotating drum. In an iron core (cylindrical) type drum motor, a part of the iron-based substrate of the stator is started up in a structure in which the magnetic field from the PG magnet is received by a coil provided on the stator, and a flexible printed circuit board having a coil pattern is wound there. And efficiently and simply outputs the PG output to the controller 70 of FIG.
0 can be taken out.

The PG structure according to the embodiment of the present invention has the following advantages by adopting a structure in which a flexible printed board provided with a coil pattern is wound around a rising portion of a stator substrate. (1) The number of components can be reduced and costs can be reduced without using components such as chip inductors. (2) A strong magnetic field can be obtained by providing the coil pattern perpendicular to the magnetic field of the PG magnet. (3) A part of the iron-based stator substrate is started up, and by using this, the pattern portion (FPC) is fixed, and at the same time, it has an effect as a back yoke. By the way, the present invention is not limited to the above-described embodiment, and the motor can be applied to electronic devices other than the rotary magnetic head device. Further, the PG coil forming portion 26c may be fixed to the substrate rising portion 32 by another method other than the adhesive tape on the back surface, for example, by applying an adhesive.

[0026]

As described above, according to the present invention,
A signal for detecting the rotational phase of the rotor can be obtained efficiently.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a preferred embodiment of a motor according to the present invention.

FIG. 2 is a sectional view showing an example of the internal structure of the motor shown in FIG.

FIG. 3 is a perspective view showing a stator board and a flexible printed board of the motor shown in FIG. 1;

FIG. 4 is a plan view showing a PG coil forming portion and a connecting portion of the flexible printed board.

FIG. 5 illustrates an example of a configuration of a flexible printed circuit board.

FIG. 6 is a diagram showing an example of a coil pattern of a PG coil forming portion of a flexible printed board.

FIG. 7 is a diagram showing a state in which the PG coil forming section starts to be fixed to the substrate rising section;

FIG. 8 is a diagram showing a state in which a first portion of a PG coil forming portion is fixed to a substrate rising portion.

FIG. 9 is a diagram showing a state in which a second portion of the PG coil forming section is fixed to a substrate rising section.

FIG. 10 is a diagram showing a state in which a third portion of a PG coil forming section is fixed to a substrate rising section.

FIG. 11 is a view showing a state where two connection terminals are soldered.

FIG. 12 is a diagram showing a conventional motor.

FIG. 13 is a view showing another conventional motor.

[Explanation of symbols]

20: stator substrate, 26: flexible printed circuit board, 26c: PG coil forming part (wiring board),
Reference numeral 32: substrate rising section, 100: rotational phase detector, 110: PG magnet (magnet for detecting rotational phase), 120: PG coil, S: stator, R ... Rotor

Claims (6)

[Claims] 1. A stator having a stator substrate made of a magnetic material, the stator substrate having a substrate rising portion, a rotor rotatable by the stator, and detection of a rotation phase of the rotor set on the rotor. And a magnet for generating a magnetic field for use, and are arranged with respect to the rising portion of the substrate so as to face the magnet. Each time the rotor rotates, it receives a magnetic field from the magnet and outputs a signal for detecting the rotational phase of the rotor. And a wiring board for generating the motor. 2. The motor according to claim 1, wherein the stator substrate is made of an iron-based metal. 3. The motor according to claim 1, wherein the wiring board is a flexible printed circuit board. 4. The motor according to claim 1, wherein the wiring board is fixed to the substrate rising portion using an adhesive. 5. The motor according to claim 1, wherein the stator has a driving coil, and the wiring board energizes the driving coil for rotating the rotor by energizing. 6. The motor according to claim 5, wherein the wiring board also serves as a frequency generating wiring pattern for generating a frequency corresponding to the rotation angle of the rotor.