JP3475437B2 - Flat motor - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION This invention, suitable Bian was applied to a capstan motor such as a VTR or tape recorder
The present invention relates to a flat motor and a manufacturing method thereof .

[0002]

2. Description of the Related Art In VTRs (video tape recorders) and tape recorders, capstan motors are used to convey magnetic tapes. By controlling the number of revolutions of the capstan motor, it is usual to control the tape speed in the reproducing or recording mode and the tape speed in the fast-forwarding or rewinding mode.

A direct current motor is generally used as the capstan motor, and its no-load rotation speed N ₀ is expressed by the following formula 1.
It is represented by. As can be seen from Expression 1, the rotation speed N ₀ is proportional to the drive voltage V. Conventionally, the rotation speed of the capstan motor is often controlled by controlling the drive voltage V.

[0004]

[Equation 1]

[0005]

However, when the drive voltage V supplied to the capstan motor is increased in the fast forward or rewind mode, there is a problem that power consumption increases. In this case, since the starting torque T _S of the capstan motor is proportional to the drive voltage V as shown in Formula 2, the starting torque T _S becomes higher than necessary.

[0006]

[Equation 2]

FIG. 11 shows the rotation speeds N1 and N2 and the starting torques T1 and T when two types of drive voltages V1 and V2 are supplied.
The relationship of 2 is shown.

Further, in order to generate two kinds of drive voltages V for two kinds of rotation speeds, a VT having two power supply circuits is provided.
There is also R. In this case, there is a problem that it is difficult to downsize the VTR.

On the other hand, there is also a VTR in which the rotation speed N ₀ of the capstan motor is fixed and the gear ratio of the intermediate gear connected to the capstan motor is changed to change the feeding speed of the magnetic tape. However, this causes a problem that the configuration is complicated and expensive.

Therefore, the present invention has solved the above-mentioned problems , and is a flat type module that can be made thin with a simple structure and that can rotate at high speed without increasing power consumption. > It proposes data and its manufacturing method .

[0011]

In order to solve the above-mentioned problems, the flat motor according to the present invention has a length in the rotation axis direction.
Flat type motor with a shape that is shorter than its diametrical length
And at least an input terminal, an intermediate terminal and an output terminal
A plurality of drive print coils having a child, the pudding
Input terminal, intermediate terminal and output terminal of the coil
The power supply circuit and bearing that are connected through
Mounted stator boards and each of these stator boards
Disk-shaped rotor facing the printed coil
It has a magnet and the center of the rotor magnet
With the rotating shaft attached,
It is equipped with a rotor that rotatably supports the rolling shaft
The coil is connected to the winding start end reaching the input terminal and the output terminal.
Has a winding end and a winding start end and a winding end.
A coil with the number of turns Z1 is formed between the
A coil with a smaller number of turns Z2 than the number of turns Z1
However, the intermediate terminal should be driven between the winding start end and the winding end end.
The rotation speed when pressure is applied is N1, and the winding start end and middle
The number of rotations when the same drive voltage is applied between the
When N2 is set, the coil position is such that N2> N1.
It is characterized by being provided. According to the present invention
The flat motor manufacturing method is such that the length in the rotation axis direction is diametrical.
Manufactures flat motors that are shorter than the length
At least the input terminal, the intermediate terminal and the
And multiple printed coils for driving with
Mounting the bearing part on the stator board with the power supply circuit
And the input terminal of the stator coil print coil,
Power supply to intermediate and output terminals through through holes
The process of connecting to the circuit and the printing of each of the stator boards
Disc-shaped rotor magnet facing the coil
And attached to the center of the rotor magnet
Rotating the rotor part with a rotating shaft by the bearing part
There is a process of assembling so as to rotatably support the shaft.
It is characterized by that .

[0012]

The flat motor and the manufacturing method thereof according to the present invention
According to this, the drive coil 23 of the capstan motor 1 which is an example of this flat type motor is provided with the input terminal 41 at the winding start end and the output terminal at the winding end end as shown in FIG. 4 (a). 42 are provided. Further, an intermediate terminal 43 is provided between the input terminal 41 and the output terminal 42.

For example, with this capstan motor 1, VT
When the R magnetic tape is conveyed, in the recording or reproducing mode, a predetermined drive voltage V is supplied to the input / output terminals 41 and 42. As a result, as shown in FIG. 6, the capstan motor 1 rotates at a predetermined rotation speed N1, and the magnetic tape is conveyed at a predetermined speed.

When the VTR is in the fast forward or rewind mode, the same drive voltage V as in the recording or reproducing mode is supplied to the input terminal 41 and the intermediate terminal 43. As a result, the capstan motor 1 rotates at a rotation speed N2 higher than the rotation speed N1 in the recording or reproduction mode. At this time, the starting torque T2 is maintained the same as the starting torque T1 in the recording or reproducing mode, so that the magnetic tape can be reliably conveyed.

[0015]

EXAMPLES Next, an embodiment in which a flat motor according to the present invention is applied to a capstan motor, its
A detailed description will be given with reference to the drawings , including the manufacturing method thereof.

FIG. 1 shows the configuration of a capstan motor 1 to which a flat type motor according to the present invention is applied. The capstan motor 1 is used, for example, to convey a magnetic tape of a VTR (video tape recorder).

The capstan motor 1 is a face-to-face type motor, and is composed of a rotor portion 10, a stator portion 20, and a rotation detecting portion 30. In the rotor unit 10, as shown in FIG. 2, a disc-shaped rotor magnet 11 is provided with a cover 12 enclosing the outer peripheral side and the upper side thereof, and the outer peripheral side thereof further has an FG (Frequency Ge) for rotation detection.
nerator) Magnet 13 is attached.

A rotating shaft 14 is attached to the center of the rotor portion 10, and the rotating shaft 14 is rotatably supported by a bearing portion 22 fixed to a stator substrate 21 of the stator portion 20. As a result, the rotor portion 10 rotates smoothly without rattling. Rotor magnet 1
As shown in FIG. 3, the 1 and FG magnets 13 have a plurality of magnetic poles magnetized over the entire circumference. Note that the magnetic poles of the FG magnet 13 are actually magnetized, for example, about 300 pieces.

In the stator portion 20, as shown in FIGS. 1 and 2, a plurality of drive coils 23 arranged to face the lower surface of the rotor magnet 11 are soldered to the pattern of the stator substrate 21. A magnetic field is generated by sequentially supplying the drive voltage V to the drive coil 23, and the magnetic force causes the rotor magnet 11 to rotate.

The drive coil 23 is formed, for example, by winding a self-bonding wire capable of alcohol fusion or heat fusion for the number of turns Z1. Then, as shown in FIG. 4A, an input terminal 41 is provided at the winding start end, and an output terminal 42 is provided at the winding end end. Further, an intermediate terminal 43 is provided between the input terminal 41 and the output terminal 42. The intermediate terminal 43 is provided at a position where the self-bonding wire is wound by the number of turns Z2. These terminals 41 to
43 can be formed by peeling off the outer coating of the self-bonding wire.

The drive coil 23 is attached by soldering terminals 41 to 43 to solder lands 26 to 28 provided in the voltage supply circuit 25 of the stator substrate 21, as shown in FIG. There is. This makes it possible to supply the predetermined drive voltage V to the drive coil 23 from the input terminal 41 and the output terminal 442 or from the input terminal 41 and the intermediate terminal 43.

The drive circuit 23 thus constructed is equivalent to a circuit in which the intermediate terminal 43 is connected to the middle of the resistor R connected between the input / output terminals 41 and 42 as shown in FIG.

For example, when the VTR is in the recording or reproducing mode, the drive voltage V is supplied from the input terminal 41 and the output terminal 42 of the drive coil 23. As a result, the capstan motor 1 is rotated at a predetermined rotation speed N1 based on the mathematical formula 1, whereby the magnetic tape is conveyed at a predetermined speed.

When the VTR is in the fast forward or rewind mode, the drive voltage V of the same level as in the recording or reproducing mode is supplied from the input terminal 41 and the intermediate terminal 43 of the drive coil 23. In this case, the drive coil 2
Since the winding number Z2 of 3 is smaller than the winding number Z1 in the recording or reproducing mode, the rotation number N is
2 is faster than the rotation speed N1 in the recording or reproduction mode. The position of the intermediate terminal 43 is appropriately determined according to the required number of rotations of the capstan motor 1.

Here, the drive voltage V is supplied via the intermediate terminal 43.
The starting torque T2 when the torque is supplied is calculated by Equation 2. As can be seen from Formula 2, the starting torque T _S of the capstan motor 1 is irrelevant to the winding number Z of the drive coil 23,
It is proportional to the drive voltage V. FIG. 6 shows the rotational speeds N1 and N2 and the starting torque T at each of the winding numbers Z1 and Z2 of the drive coil 23.
The relationship between 1 and T2 is shown.

As can be seen from the figure, in the fast-forward or rewind mode, the drive voltage V is supplied through the intermediate terminal 43 having the number of turns Z2, which is smaller than the number of turns Z1 in the recording or reproducing mode, so that the number of revolutions N2 is increased. However, since the starting torque T2 does not decrease, it is possible to reliably carry the magnetic tape.

In the rotation detecting section 30, a magnetic sensitive element 31 is arranged so as to face the outer peripheral surface of the FG magnet 13 of the rotor section 10 as shown in FIG. The magnetic sensitive element 31 detects a change in the magnetic field caused by the rotation of the FG magnet 13, and is provided on a substrate 32 made of an insulating material such as a glass plate or a ceramic plate, as shown in FIG.
As shown in FIG. 3, it is formed of a conductive material having a magnetoresistive effect in an elongated U-shape.

In this example, the magnetic pole width λ of the FG magnet 13 is
Four magnetic sensitive elements 31 are provided at intervals of ½ of the above, and these are connected in series to form the rotation detection circuit 38.
The equivalent circuit of the rotation detection circuit 38 is a bridge circuit as shown in FIG. The power supply VCC and the ground GND are connected to the two terminals 34 and 35 on one diagonal of the bridge circuit, and the outputs for outputting the two signals P1 and P2 having different phases to the two terminals on the other diagonal. The terminals 36 and 37 are connected.

The resistance value of the magnetic sensitive element 31 changes with the change of the magnetic field. Therefore, when the FG magnet 13 rotates, the resistance value of the bridge circuit changes, which causes the output terminals 36 and 37 to output sinusoidal signals P1 and P2 whose phases are shifted by 180 degrees as shown in FIG. By counting the zero cross points of these signals P1 and P2 or their difference signals, it becomes possible to detect the rotational speed of the FG magnet 13, that is, the rotor unit 10. The S / N ratio is improved by using the differential signal between the signals P1 and P2.

In FIG. 2, the substrate 32 holding the magnetic sensitive element 31 is attached to a predetermined position of the bottom plate 21 by the support portion 33. As a result, the magnetic sensitive element 31 and the FG
The gap between the magnet 13 and the magnet 13 has a predetermined size, and the magnetic sensitive element 31 can reliably detect a change in the magnetic field of the FG magnet 13.

In the above embodiment, the case where the intermediate terminal 43 is provided in the drive coil 23 of the surface facing motor has been described, but as shown in FIG. 10, the surface facing motor (not shown).
Input / output terminals 51, 5 of the print coil 50 used for
It is also possible to provide an intermediate terminal 53 between the two and obtain two types of rotation speeds. In this case, a voltage supply circuit is printed on both sides of the printed circuit board on which the print coil 50 is printed, and this is connected by through holes provided as the terminals 51 to 53. Further, not only the above-mentioned face-to-face motor but also the armature winding of the circumferentially opposed motor can be provided with an intermediate terminal to control the rotation speed.

Further, in the above embodiment, the intermediate terminals 43, 5
Although the case where 3 is provided at only one location has been described, the intermediate terminals can be provided at a plurality of locations on the coil. This makes it possible to easily obtain a plurality of types of rotation speed.

[0033]

As described above, the flat type according to the present invention
According to the motor and the manufacturing method thereof, at least the input terminal
A plurality of driving pre-processors having a child, an intermediate terminal and an output terminal
On a stator substrate that includes an inductor coil and a power supply circuit.
The print coil input terminal, intermediate terminal and output terminal.
Connect the child to the power supply circuit through the through hole
Done

With this configuration, the print coil and the power supply are
The supply circuit can be connected at the shortest distance. Obey
The length in the direction of the rotation axis is shorter than the length in the diameter direction.
Manufacturing capstan motors and other products with reduced thickness
be able to. This allows the key manufactured according to the present invention to be
Capstan motors, etc. for camcorders etc. with a small mounting area
It can be fully applied. Moreover, the print coil
A coil with a winding number Z1 is formed between the winding start end and the winding end end.
However, the distance between the winding start end and the intermediate terminal is less than the winding number Z1.
The coil has a large number of turns Z2. This winding start end and middle
Rotational speed N when the same drive voltage is applied between the terminals
2 applies a drive voltage between the winding start end and the winding end end
When the coil position is higher than the rotational speed N1
Terminals are provided. Therefore, the number of rotations can be increased without increasing the drive voltage, and it is possible to prevent an increase in power consumption. Also , turn the motor
When applied to a capstan motor, its normal speed
Since it is not necessary to provide two types of power supply circuits for the speed at the time of feeding and fast-forwarding, downsizing is possible. Further, since it is not necessary to use an intermediate gear for shifting, the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a capstan motor 1 to which a motor according to the present invention is applied.

FIG. 2 is a cross-sectional view of the capstan motor 1.

FIG. 3 shows a rotor magnet 11 and an FG magnet 13.
It is a figure explaining the magnetic pole.

FIG. 4 is a diagram illustrating each terminal 41 to 43 of the drive coil 23 and a mounting state.

FIG. 5 is a diagram illustrating an equivalent circuit of a drive coil 23.

FIG. 6 is a diagram illustrating the characteristics of the capstan motor 1 at each of the numbers of turns Z1 and Z2 of the drive coil 23.

FIG. 7 is a diagram illustrating a magnetic sensitive element 31.

FIG. 8 is a diagram illustrating an equivalent circuit of a rotation detection circuit 38.

9 is a diagram illustrating output signals P1 and P2 of a rotation detection unit 30. FIG.

FIG. 10 is a diagram illustrating a case where a print coil 50 is provided with an intermediate terminal 53.

FIG. 11 is a diagram illustrating characteristics of the capstan motor 1 when the drive voltage V is changed.

[Explanation of symbols]

1 capstan motor 10 Rotor part 11 rotor magnet 20 Stator part 21 Stator board 23 Drive coil 25 voltage supply circuit 26-28 Solder land 50 printed coils 41,51 input terminals 42,52 output terminals 43,53 Intermediate terminal

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-6-90536 (JP, A) JP-A-57-59489 (JP, A) JP-A-5-22990 (JP, A) JP-A-4- 105587 (JP, A) JP 5-15128 (JP, A) JP 63-116410 (JP, A) Actually opened 63-146494 (JP, U) Actually opened 4-86327 (JP, U) 58-124916 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H02K 3/00-3/28

Claims (3)

(57) [Claims] 1. The ratio of the length in the rotation axis direction to the length in the diameter direction
A flat motor having a short overall shape, and having at least an input terminal, an intermediate terminal and an output terminal
Print coils for multiple drives,
Input terminal, intermediate terminal and output terminal through through holes
Connected power supply circuit and bearing
And a stator substrate and a surface pair for each printed coil of the stator substrate.
Has a disk-shaped rotor magnet that is oriented, and
With a rotating shaft attached to the center of the data magnet,
The rotating shaft is rotatably supported by the bearing portion.
A rotor portion, and the print coil reaches a winding start end reaching the input terminal and the output terminal
A coil having a winding end and a coil having a winding number Z1 between the winding start end and the winding end end.
The form, between said winding start end intermediate terminal is the number of turns Z1
A coil having a smaller number of turns Z2 is formed, and the intermediate terminal applies a drive voltage between the winding start end and the winding end end.
When the number of rotations is N1 , the same drive voltage is applied between the winding start end and the intermediate terminal.
When the number of rotations is N2, the relationship of N2> N1
Flat type that is installed at the coil position
Motor . 2. The length in the direction of the rotation axis is greater than the length in the diameter direction.
It is a method of manufacturing a flat type motor that has a short overall appearance.
Has at least an input terminal, an intermediate terminal and an output terminal
Equipped with multiple drive print coils and power supply circuit
The step of mounting the bearing portion on the stator board, the input terminal of the printed coil of the stator board, the intermediate end
The power supply child and an output terminal through the through hole
A step of connecting to the supply circuit, and a face pair for each printed coil of the stator substrate.
Has a disk-shaped rotor magnet that is oriented, and
A rotor with a rotating shaft attached to the center of the rotor magnet.
Rotation of the rotating shaft of the rotor part by the bearing part
And a step of assembling so as to support.
Method for manufacturing flat motor . 3. The printed coil reaches a winding start end reaching the input terminal and the output terminal.
A coil having a winding end and a coil having a winding number Z1 between the winding start end and the winding end end.
The form, between said winding start end intermediate terminal is the number of turns Z1
A coil having a smaller number of turns Z2 is formed, and the intermediate terminal applies a drive voltage between the winding start end and the winding end end.
When the number of rotations is N1 , the same drive voltage is applied between the winding start end and the intermediate terminal.
When the number of rotations is N2, the relationship of N2> N1
It is provided in the coil position where
2. The method for manufacturing a flat type motor according to 2 .