JP3269230B2 - motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor used for, for example, an infrared sensor.

[0002]

2. Description of the Related Art In recent years, the development of small high-performance motors and multifunctional motors has been desired in response to demands for downsizing of apparatuses.

[0003] The first conventional motor will be described below. FIG. 11 shows a motor used in a conventional infrared sensor. In FIG. 11, reference numeral 91 denotes a magnet, 92 denotes a shaft, and 93 denotes a rotor frame to which the magnet 91 and the shaft 92 are fixed. 94 is a bearing for rotatably supporting a rotating shaft 92, 95 is a stator coil, 96 is a flexible printed circuit board on which the stator coil 95 is fixed by wiring, and 97 is a bracket on which the flexible printed circuit board 96 is fixed. are doing. 98
Is a chopper fixed to the rotor, 99 is a fixed yoke for fixing the bracket, and 100 is an infrared detector.

[0004] Regarding the motor configured as described above,
The operation will be described below. First, when the stator coil 95 is energized through the flexible printed circuit board 96, a magnetic field is generated by the current flowing through the stator coil 95, and a rotational force is generated in relation to the magnetic flux of the magnet 91, and the shaft 94 is rotatably supported by the bearing 94. The rotor rotates and the chopper 9 fixed to the rotor
8 rotates. The chopper 98 is provided with a window or a notch for allowing infrared light to pass therethrough, and opens and closes the incident aperture angle of the infrared detector 100 by rotating.

Hereinafter, a second conventional motor will be described. As a method of stopping the motor, there is a method of reducing the current supplied to the stator coil to zero, or a method of short-circuiting the end of the stator coil and using a brake torque due to a regenerative current flowing by a back electromotive force induced in the stator coil. Generally known.

[0006]

However, in the above-mentioned first conventional configuration, an opening / closing mechanism for the incident aperture angle of the infrared detecting section must be provided outside the motor, which hinders downsizing of the sensor. In addition, the occurrence of vibration due to the imbalance of the chopper becomes a problem.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and realizes downsizing of the sensor by forming a mechanism for opening and closing the incident aperture angle of the infrared detecting section which hinders downsizing of the sensor inside the motor. It is intended to provide a motor that can be used. Another object of the present invention is to provide a motor that generates less vibration by forming the chopper into a disk shape.

However, in the second conventional method,
The stop position of the motor cannot be limited.

An object of the present invention is to solve the above-mentioned conventional problems, and an object of the present invention is to fix a stop position of a motor to an arbitrary position.

[0010]

In order to achieve the first object, the fixed yoke of the motor according to the present invention has a window, a bracket has a notch, and a rotor frame has a chopper or a rotor frame. It is configured to have its own chopper function. In addition, a surface treatment is applied to a part of the surface of the chopper having a disk shape.

In order to achieve the second object, a motor according to the present invention is a motor having a plurality of stator coils, a position detecting means for detecting a relative position between the stator coil and the magnet, and a position detecting means. Power supply switching means for sequentially outputting a power supply switching signal to the stator coil based on the output signal, and motor stopping means for fixing the output of the power supply switching means based on a stop signal to the motor. is there.

[0012]

According to the first configuration, the infrared sensor can be configured without providing an opening / closing mechanism for the incident opening angle of the infrared detection device outside the motor, and the size of the sensor can be reduced. Further, since the chopper is formed in a disk shape, it is possible to suppress occurrence of vibration.

According to the second configuration, it is possible to set an arbitrary stop position when stopping the motor.

[0014]

(Embodiment 1) An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, 1 is a magnet, 2 is a shaft, 3 is a rotor frame, 4 is a bearing, 5 is a stator coil, 6 is a flexible printed circuit board, 7 is a bracket, 8 is a chopper, 9 is a fixed yoke, and 10 is a fixed yoke. It is an infrared detector.

The magnet 1 is fixed to one surface of the rotor frame 3, the chopper 8 is fixed to the opposite surface, and the shaft 2 is fixed to the center of the rotor frame 3. The stator coil 5 is wired on a flexible printed circuit board 6 and fixed to a bracket 7 so as to face the magnet 1. A bearing 4 is fixed to the bracket 7 and rotatably supports the shaft 2. The fixed yoke 9 is provided with a window for an infrared aperture, and the bracket 7 is provided with a cutout 13 for passing infrared light and a cutout 14 for adjusting the balance of the magnetic circuit. 9 is provided with a notch 15 for mounting a photodetector.

With respect to the motor configured as described above,
The operation will be described below. First, when the stator coil 5 is energized through the flexible printed circuit board 6, a magnetic field is generated by the current flowing through the stator coil 5, and a rotational force is generated due to the relationship with the magnetic flux of the magnet 1.
Since the shaft 2 is rotatably supported by the bearing 4, the shaft 2 rotates, and the rotor frame 3, the magnet 1, and the chopper 8 to which the shaft 2 is connected also rotate.
The chopper 8 has a sector shape as shown in FIG.
2 (b), as shown in FIG. 2 (c), it is composed of two or more arcs having different curvatures, so that there is a space between the infrared aperture window of the fixed yoke 9 and the notch 13 of the bracket 7 for passing infrared light. When rotated, the opening angle of the incident aperture of the infrared detection unit 10 can be opened and closed inside the motor. Further, the notch 14 provided for adjusting the magnetic circuit balance can maintain the magnetic circuit balance and maintain the rotational stability. Further, since the bracket 7 and the fixed yoke 9 are provided with the cutouts 15 for mounting the photodetector, a photodetector for judging whether the shutter is open or closed based on the presence or absence of light transmission can be mounted. In addition, since the motor components are subjected to a surface treatment with an infrared emissivity of 0.8 or more, it is possible to prevent heat generated inside the motor from being reflected inside the motor and entering the infrared detection unit 10. it can.

As described above, according to the present embodiment, the infrared sensor can be opened and closed inside the motor by fixing and rotating the chopper on the rotor frame inside the motor, thereby reducing the size of the infrared sensor. Can be realized.

Although the present embodiment has been described with an example of a chopper shape in which the opening / closing time of the incident opening angle of the infrared detector is one-to-one, a chopper capable of setting the opening / closing time to an arbitrary ratio is described. It goes without saying that it may be shaped.

(Embodiment 2) A second embodiment of the present invention will be described below with reference to the drawings.

In FIG. 3, 1 is a magnet, 2 is a shaft, 3 is a rotor frame, 4 is a bearing, 7 is a bracket, 8 is a chopper, 9 is a fixed yoke, and 10 is an infrared detector. The above is the same as the configuration in FIG. FIG.
3 in that the stator coil 5 is formed on the same surface as the flexible printed circuit board 6 by plating or etching.

With respect to the motor configured as described above,
The operation will be described below. The operation in this case is exactly the same as the operation of the first embodiment. Since the stator coil 5 is formed on the same surface as the flexible printed circuit board 6, the thickness of the motor can be reduced by the thickness of the stator coil. In addition, the infrared incident aperture angle of the infrared detector can be made wider, and high-speed detection can be performed.

As described above, according to the present embodiment, the stator coil is formed on the same plane as the flexible printed circuit board by plating or etching.
A small, high-performance infrared sensor can be configured.

(Embodiment 3) A third embodiment of the present invention will be described below with reference to the drawings.

4A and 4B, reference numeral 11 denotes a chopper, which is made of a transparent resin such as polyethylene which transmits infrared rays. A part of the surface of the chopper 11 is subjected to a surface treatment to give an emissivity of 0.8 or more.

The operation of the chopper configured as described above will be described below. First, chopper 1
When 1 rotates, the chopper 11 is made of a material that transmits infrared rays, and a part of the chopper 11 is subjected to a surface treatment that has an emissivity of 0.8 or more. Can control the incidence of infrared rays.

As described above, according to the present embodiment, the chopper is made of a material that transmits infrared rays, and a part of the chopper is subjected to a surface treatment to have an emissivity of 0.8 or more, so that the shape of the chopper is unfolded. A motor having a predetermined function can be configured without having a different shape that causes balance vibration.

Although the present embodiment has been described with reference to an example of a chopper in which the opening / closing time of the incident opening angle of the infrared detecting unit is one to one, a chopper capable of setting the opening / closing time to an arbitrary ratio is provided. It goes without saying that this may be done.

(Embodiment 4) Hereinafter, a fourth embodiment of the present invention will be described with reference to the drawings.

In FIG. 5A, reference numeral 1 denotes a magnet, 2
Is a shaft, 4 is a bearing, 5 is a stator coil, 6 is a flexible printed circuit board, 7 is a bracket, 9 is a fixed yoke, and 10 is an infrared detector. The above is the same as the configuration in FIG. The difference from the configuration of FIG. 1 is that the chopper is eliminated and the rotor frame 12 is formed of two or more arcs having different curvatures as shown in FIGS. 5B and 5C.

With respect to the motor configured as described above,
The operation will be described below. The operation in this case is exactly the same as that of the first embodiment, and the chopper is eliminated, and the rotor frame 12 is configured by two or more arcs having different curvatures, so that the rotor frame 12 can have a chopper function. Therefore, the number of components and man-hours can be reduced, and the thickness of the motor can be reduced by the thickness of the chopper.

As described above, according to the present embodiment, the chopper is eliminated and the rotor frame is formed of two or more arcs having different curvatures, so that the infrared sensor can be downsized.

In this embodiment, the description has been given of the example of the rotor frame shape in which the opening / closing time of the incident opening angle of the infrared ray detecting section is one-to-one, but the opening / closing time can be set to an arbitrary ratio. Needless to say, the shape may be a rotor frame.

(Embodiment 5) Hereinafter, a fifth embodiment of the present invention will be described with reference to the drawings.

In FIG. 6, 1 is a magnet, 2 is a shaft, 4 is a bearing, 7 is a bracket, 9 is a fixed yoke, 1
Reference numeral 0 denotes an infrared detection unit, and reference numeral 12 denotes a rotor frame. The above is the same as the configuration of FIG. 5 in that the stator coil 5 is formed on the same surface as the flexible printed circuit board 6 by plating or etching.

With respect to the motor configured as described above,
The operation will be described below. The operation in this case is exactly the same as the operation of the fourth embodiment, and since the stator coil 5 is formed on the same surface as the flexible printed circuit board 6, the motor thickness can be reduced by the thickness of the stator coil. In addition, the infrared incident aperture angle of the infrared detector can be made wider, and high-speed detection can be performed.

As described above, according to this embodiment, the stator coil is formed by plating or etching on the same plane as the flexible printed circuit board.
A small, high-performance infrared sensor can be configured.

Although the above-described first to fifth embodiments of the present invention have been described with reference to the example of the flat-faced type motor, the present invention may be constituted by a circumferentially opposed type motor. The same effect as the effect described above can be obtained.

(Embodiment 6) Hereinafter, a sixth embodiment of the present invention will be described with reference to the drawings.

In FIG. 7, 61 to 63 are stator coils, and 70 to 75 are drive transistors. The collectors of the transistors 70, 72, 74 are commonly connected and connected to a power supply VM, and the emitters of the transistors 71, 73, 75 are commonly connected and grounded. The emitter of the transistor 70 is connected to the collector of the transistor 71 and connected to one end of the stator coil 61 and input to the position detection circuit 20. Similarly, the emitter of the transistor 72 and the transistor 7
3, one end of the stator coil 62, the emitter of the transistor 74, the collector of the transistor 75, and one end of the stator coil 63 are commonly connected and input to the position detection circuit 20, respectively.
The other ends of the stator coils 61 to 63 are commonly connected. The output of the position detection circuit 20 is a logic circuit 31
The output A of the logic circuit 31 is connected to the base of a transistor 42, and the base of the transistor 42 is connected to a power supply VCC via a constant current source 41. The outputs UH1 to WL2 of the logic circuit 31 are respectively D-type flip-flops (hereinafter referred to as D-FFs).
47 to 52 are connected to D inputs. The emitter of the transistor 42 is grounded, the collector is commonly connected to the base of the transistor 44 and the collector of the transistor 46, and is connected to the power supply VCC via the constant current source 43. The emitter of the transistor 46 is grounded, the base is connected to the power supply VCC via the constant current source 45, and constitutes a motor stop signal input section.
The T input terminals of the D-FFs 47 to 52 are commonly connected and connected to the collector of the transistor 44. Outputs UH2-WL2 of the D-FFs 47-52 are energization signals to the stator coils 61-63,
Through the driving transistors 74, 72, 70, 7
5, 73, and 71, respectively. The logic circuit 31 and the amplifying circuit 32 constitute an energization switching means 30, and include the constant current sources 41, 43, 45, the transistors 42, 44, 46, and the D-FFs 47-5.
Reference numeral 2 denotes a motor stopping means 40.

The operation of the motor driving device configured as described above will be described below.

FIG. 8 is an explanatory diagram of the operation of the sixth embodiment of the present invention, and is a timing chart of each part of the power supply switching means and the motor stopping means. 8UH1 to WL1 are timings of energizing the stator coil obtained by performing waveform processing on the output signal of the position detection circuit, and FIG. 8A is a waveform obtained from each edge of the UH1 to WL1.
UH2 to WL2 in the drawing are output signals of the motor stop means 40, which are transmitted to the bases of the drive transistors 70 to 75 via the amplifier circuit 32 which is a component of the power supply switching means 30, and power is supplied to the stator coil. . When the motor stop signal is LOW, the transistor 46 is turned off, and the output A of the logic circuit 31 becomes D through the transistor 44.
-Since they are input to the T input terminals of the FFs 47 to 52, the output signals of the logic circuit are UH1 = UH2, VH1 = VH2,
WH1 = WH2, UL1 = UL2, VL1 = VL2, W
L1 = WL2, and the motor is driven while maintaining normal rotation. When the motor stop signal is HIGH, the transistor 46 is turned on, the transistor 44 is turned off, and the D− signal is output regardless of the logic circuit outputs UH1 to WL1.
The outputs UH2 to WL2 of the FFs 47 to 52 are fixed. Therefore, the power supply to the stator coil is fixed, and
The rotor (not shown) and the stator (stator coil) are positioned at the relative position determined by the torque by energizing the N phase (WH2 and VL2 in FIG. 8), and the motor can be stopped.

(Embodiment 7) Next, a seventh embodiment of the present invention will be described with reference to the drawings.

In FIG. 9, components having the same functions as those in FIG. 7 are denoted by the same reference numerals, and description thereof will be omitted.

In FIG. 9, the output signal of a photo sensor (not shown) for detecting the absolute position of the rotor is connected to the base of a transistor 90 and to a power supply VCC via a constant current source 89, The 90 emitter is grounded. The motor stop signal is connected to the base of the transistor 88 and to the power supply VCC via the constant current source 87, and the emitter of the transistor 88 is grounded. The collector of the transistor 88 and the collector of the transistor 90 are commonly connected to the base of the transistor 46, and the constant current source 4
5 is connected to the power supply VCC.

The operation of the motor driving device configured as described above will be described below.

FIG. 10 is an explanatory diagram of the operation of the seventh embodiment of the present invention, and is a timing chart of each section of the power supply switching means, the motor stopping means, and the photo sensor output. In the figure, when the motor stop signal is HIGH, the transistor 88 is turned on and the base of the transistor 46 is fixed at LOW, so that the transistor 46 is turned off without being affected by the photosensor output. Accordingly, the motor is driven while maintaining the normal rotation as in the case where the motor stop signal is LOW in the sixth embodiment of the present invention.

Next, when the motor stop signal is LOW, the transistor 88 is turned off, and the output of the photo sensor becomes HI.
If it is GH, the transistor 90 is turned on and the transistor 46 is turned off, so that the motor is driven while maintaining normal rotation. However, when the photosensor output becomes LOW, the transistor 90 is turned off and the transistor 46 is also turned off.
It becomes FF. Therefore, similarly to the case where the motor stop signal is HIGH in the sixth embodiment of the present invention, the energization to the stator coil is fixed, and the phase which is ON at that time (FIG. 10)
In this case, the rotor (not shown) and the stator (stator coil) are positioned at the relative positions determined by the torque generated by energizing the UH2 and WL2), and the motor stops. That is, by arranging the photo sensor at an arbitrary position,
The motor can be stopped at any place.

In this embodiment, the photo sensor is used to detect the absolute position of the motor. However, the same effect can be obtained by using an electromagnetic transducer such as a Hall element or other detection elements.

[0050]

As described above, according to the present invention, downsizing of the sensor can be realized by arranging the opening / closing mechanism of the incident aperture angle of the infrared ray detecting section inside the motor, which hinders downsizing of the sensor. . Further, by forming the chopper in a disk shape, vibration can be suppressed.

In a motor having a plurality of phases of stator coils, a position detecting means for detecting a relative position between the stator coils and the magnet, and an energization switching to the stator coils based on an output signal of the position detecting means. The power supply switching means for sequentially outputting signals, and the output of the power supply switching means is fixed based on a stop signal to the motor, so that the rotor and the rotor are positioned at a position determined by the current supplied to the ON phase. The motor can be stopped by relatively positioning the stator.

Further, the apparatus has an absolute position detecting means for detecting an absolute position of the motor. When a motor stop signal is inputted, the motor switching means is turned on at an arbitrary rotor position corresponding to the output signal of the absolute position detecting means. The motor can be stopped at an arbitrary place by fixing the output.

[Brief description of the drawings]

FIG. 1A is a sectional view of a motor according to a first embodiment of the present invention; FIG. 1B is a top view of the motor according to the first embodiment of the present invention;

FIG. 2A is a top view of a chopper according to a first embodiment of the present invention. FIG. 2B is a top view of another chopper according to the first embodiment of the present invention. Top view of another chopper in the embodiment

FIG. 3 is a sectional view of a motor according to a second embodiment of the present invention.

FIG. 4A is a top view of a chopper according to a third embodiment of the present invention. FIG. 4B is a top view of another chopper according to the third embodiment of the present invention.

5A is a sectional view of a motor according to a fourth embodiment of the present invention, FIG. 5B is a top view of a rotor frame according to the fourth embodiment of the present invention, and FIG. 5C is a fourth embodiment of the present invention. Top view of another rotor frame in the example

FIG. 6 is a sectional view of a motor according to a fifth embodiment of the present invention.

FIG. 7 is a circuit configuration diagram of a motor driving device according to a sixth embodiment of the present invention.

FIG. 8 is an explanatory diagram of an operation of a motor driving device according to a sixth embodiment of the present invention.

FIG. 9 is a circuit configuration diagram of a motor driving device according to a sixth embodiment of the present invention.

FIG. 10 is an explanatory diagram of an operation of a motor driving device according to a sixth embodiment of the present invention.

FIG. 11 is a cross-sectional view of a motor used in a conventional infrared sensor.

[Explanation of symbols]

 1,91 magnet 2,92 shaft 3,12,93 rotor frame 4,94 bearing 5,61,62,63,95 stator coil 6,96 flexible printed circuit board 7,97 bracket 8,11,98 chopper 9,99 fixed Yoke 10, 100 Infrared detector 13 Notch for infrared ray passage 14 Notch for magnetic circuit balance adjustment 15 Notch for photodetector attachment 20 Position detection circuit 30 Conduction switching means 31 Logic circuit 32 Amplifier circuit 40 Motor stopping means 41, 43, 45, 87, 89 Constant current source 42, 44, 46, 88, 90 Transistor 47-52 D-type flip-flop 70-75 Driving transistor

──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Shin Hasegawa 1006 Kazuma Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. In-house (72) Inventor Takashi Deguchi 1006 Kadoma, Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (72) Inventor Taketo Chinomi 1006 Odaka, Kazuma, Kadoma, Osaka Pref. Shin Iwasa 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (56) References JP-A-49-119679 (JP, A) JP-A-5-60607 (JP, A) JP-A 59-119 67860 (JP, A) JP-A-64-76199 (JP, A) JP-A-59-122388 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H02K 29/00 H02K 11 / 00 H02K 21/00 H02P 7 / 00 101

Claims (6)

(57) [Claims] 1. A flat annular magnet in which N and S poles are alternately magnetized in a circumferential direction on an end face, a rotor frame having the magnet and a shaft fixed thereto, and a bearing for rotatably supporting the rotor frame. A flat stator coil opposed to the magnet via a gap, a flexible printed board on which the stator coil is wired, a bracket fixing the flexible printed board, the stator coil and the bearing, and the bracket A motor comprising a fixed yoke fixed, wherein the fixed yoke is provided with a window, the bracket is provided with a notch, and the rotor frame is provided with a chopper. 2. The motor according to claim 1, further comprising a stator coil formed on the same surface as the flexible printed circuit board by plating or etching. 3. A chopper, which is formed in a fan-shape or a two- or more-square shape having a window provided in the fixed yoke and a notch provided in the bracket, the opening being capable of opening and closing an incident angle of infrared rays. 2. The motor according to claim 1, wherein the motor is constituted by an arc. 4. A chopper for chopping infrared rays, wherein the chopper is formed of a disc-shaped material that transmits infrared rays, and has an emissivity on a part of an infrared incident window that can open and close an infrared incident aperture angle. A motor characterized by a surface treatment of 0.8 or more. 5. The motor according to claim 1, wherein the bracket has at least one notch for adjusting a magnetic circuit balance, in addition to the notch provided in the bracket. 6. The method according to claim 1, wherein :
Infrared sensor using a motor.