JP6229815B2 - Stepping motor control device and air purifier incorporating the stepping motor - Google Patents

Description

  The present invention relates to a control device for a stepping motor and an air cleaner incorporating the stepping motor.

  The stepping motor is generally one that rotates by a two-phase excitation method to obtain torque, and a voltage is applied to the excitation winding of the stepping motor by a pulse signal. While shifting 1/2 pulse, voltages are sequentially applied to the four excitation windings of the stepping motor, and this is repeated to rotate the stepping motor to obtain torque.

  In such a stepping motor, a driving torque is applied at the initial stage of switching to apply a voltage to each excitation winding, and the stepping motor rotates. For this reason, when drive torque is applied, the sound generated by driving the stepping motor is loudest and may be felt as noise.

  Therefore, a device has been proposed in which a voltage drop element is connected between a power source for applying a voltage for exciting the winding of the stepping motor and the winding, and the voltage applied to the winding is lowered to reduce noise. (For example, refer to Patent Document 1).

  Further, there has been proposed one that reduces noise by exciting the winding of the stepping motor so as to increase the voltage to be supplied while increasing the width of the pulse, in other words, the width of the energization time (see, for example, Patent Document 2). ).

Japanese Unexamined Patent Publication No. 2004-012028 Japanese Unexamined Patent Publication No. 6-198987

  When the stepping motor is controlled as described in Patent Document 1, the applied voltage is reduced to reduce noise, and accordingly, the torque in the rotational direction is also reduced. Therefore, when the load applied to the stepping motor is large, there is a problem that the possibility that the rotation is locked increases.

  Further, when the stepping motor is controlled as described in Patent Document 2, since the stepping motor has four phases, control means for four phases and a power source corresponding to the control means are required. For this reason, it costs. Also, the control program becomes difficult. Furthermore, since the number of times of switching increases, noise may be generated and countermeasures may be required.

  In order to solve such problems, an object of the present invention is to provide a control device for a stepping motor that can reduce noise generated at the initial stage of pulse output while suppressing torque reduction and cost increase of the stepping motor.

Control device for a stepping motor according to the present invention to solve the problem, can be switched and a power supply that outputs a voltage for exciting the windings of the stepping motor, the voltage applied to the windings is output from the power supply Voltage switching means, and the voltage switching means switches the voltage applied to the winding to the first voltage for a predetermined initial time of pulse output for driving the stepping motor, and after the fixed time has elapsed The voltage applied to the winding is switched to a second voltage higher than the first voltage.

The control device for a stepping motor according to the present invention for solving the problems is capable of switching a power supply that outputs a voltage of the excitation windings of the stepping motor, the voltage applied to the windings is output from the power supply and voltage switching means, Ru comprising a. Power outputs a reference voltage. The voltage switching means switches the voltage applied to the winding to a voltage lower than the reference voltage for a predetermined initial time of the pulse output for driving the stepping motor, and is applied to the winding after a certain time has elapsed. The voltage is switched to the reference voltage .

  Moreover, the air cleaner which concerns on this invention which solves a subject is provided with the control apparatus of one of the said stepping motors, and a stepping motor, and a main body rotates by the drive of a stepping motor.

  According to the present invention, the voltage applied to the winding of the stepping motor is switched to the first voltage for an initial fixed time of the pulse output for driving the stepping motor, and is applied to the winding after the fixed time has elapsed. Since the generated voltage is switched to the second voltage higher than the first voltage, the driving torque can be kept low at the initial stage of the pulse output for driving the stepping motor, and the driving noise of the stepping motor is reduced. can do.

  Then, after driving for a low driving torque and after a certain time has elapsed, the voltage applied to the winding of the stepping motor is switched to a second voltage higher than the first voltage. Can rotate the stepping motor with high driving torque.

It is a principal part circuit diagram of the control apparatus of the stepping motor which concerns on Embodiment 1 of this invention. It is a timing chart at the time of the normal rotation of one Example of the stepping motor controlled by the control device of the stepping motor according to Embodiment 1 of the present invention. It is a timing chart at the time of reverse rotation of one Example of the stepping motor controlled by the control device of the stepping motor according to Embodiment 1 of the present invention. It is a perspective view which shows schematic structure of the air cleaner provided with the control apparatus of the stepping motor which concerns on Embodiment 2 of this invention. The air purifier provided with a control device for a stepping motor according to a second embodiment of the present invention, is a cross-sectional view taken along section A-A shown in FIG. It is a disassembled perspective view of the air cleaner provided with the control apparatus of the stepping motor which concerns on Embodiment 2 of this invention. It is a perspective view of the air cleaner main body support stand with which the stepping motor controlled by the control apparatus of the air cleaner provided with the control apparatus of the stepping motor which concerns on Embodiment 2 of this invention was attached. It is a disassembled perspective view of the air cleaner main body support stand shown in FIG. It is sectional drawing (b) cut | disconnected by the top view (a) seen from the upper direction of the air cleaner main body support stand shown in FIG. 7, and the cross section BB shown to a top view (a). It is a schematic block diagram of the air cleaner provided with the control apparatus of the stepping motor which concerns on Embodiment 2 of this invention.

Embodiment 1 FIG.
(Stepping motor control circuit configuration and control)
FIG. 1 is a main part circuit diagram of a stepping motor control apparatus according to Embodiment 1 of the present invention. FIG. 2 is a timing chart at the time of normal rotation of the stepping motor controlled by the stepping motor control apparatus according to the first embodiment of the present invention. FIG. 3 is a timing chart at the time of reverse rotation of the stepping motor controlled by the stepping motor control apparatus according to the first embodiment of the present invention. A stepping motor control apparatus according to Embodiment 1 of the present invention will be described with reference to FIGS.

  A stepping motor (drive motor) 82 shown in FIG. 1 is a two-phase excitation type unipolar stepping motor, and includes a rotor 82a and excitation windings 82b, 82c, 82d, and 82e. The stepping motor (drive motor) 82 rotates by applying an electrical pulse signal to the excitation windings 82b, 82c, 82d, and 82e. In other words, the stepping motor (drive motor) 82 rotates when energized.

  Reference numeral 101 denotes a transistor for controlling an electric pulse signal to the excitation winding 82b. A transistor 102 controls an electrical pulse signal to the excitation winding 82d. Reference numeral 103 denotes a transistor for controlling an electric pulse signal to the excitation winding 82c. A transistor 104 controls an electric pulse signal to the exciting winding 82e. Reference numerals 101 to 104 denote npn-type bipolar transistors (hereinafter referred to as transistors).

  The base of the transistor 101 is connected to a signal line of a pulse signal X given to drive a stepping motor (drive motor) 82. Similarly, a signal line of a pulse signal X ′ given to drive the stepping motor 82 is connected to the base of the transistor 102. The base of the transistor 103 is connected to a signal line of a pulse signal Y given to drive a stepping motor (drive motor) 82. The base of the transistor 104 is connected to a signal line of a pulse signal Y ′ given to drive the stepping motor 82. The X, X ′, Y, and Y ′ pulse signals are output from a microcomputer (not shown).

  A power source 111 drives a stepping motor (drive motor) 82. The power source 111 outputs a DC12V reference voltage (second voltage) applied to each of the excitation windings 82b, 82c, 82d, and 82e. Reference numeral 105 denotes an electric resistance element. The electric resistance element 105 is used to lower the voltage of the power supply 111 to a voltage (first voltage) lower than the reference voltage (second voltage).

  Reference numeral 106 denotes a pnp bipolar transistor (hereinafter referred to as a transistor), which constitutes an electric resistance element 105 and a voltage switching means 108. The voltage switching means 108 sets the voltage applied to each of the excitation windings 82b, 82c, 82d, and 82e to a reference voltage (second voltage) or a voltage (first voltage) lower than the reference voltage (second voltage). ) To switch to any one of the following.

  When the transistor 106 is off, no current is supplied between the emitter and the collector. For this reason, the voltage applied to each of the excitation windings 82b, 82c, 82d, and 82e passes through the electric resistance element 105. As a result, the reference voltage (second voltage) drops. The voltage applied to each of the excitation windings 82b, 82c, 82d, and 82e is a voltage (first voltage) lower than the reference voltage (second voltage).

  When the transistor 106 is on, current is supplied between the emitter and the collector. For this reason, a current flows between the emitter and the collector, bypassing the electric resistance element 105 where the current does not easily flow. As a result, the reference voltage (second voltage) hardly drops. A reference voltage (second voltage) is applied to each of the excitation windings 82b, 82c, 82d, and 82e. As described above, the transistor 106 is turned on and off, so that the voltage (first voltage) lower than the reference voltage (second voltage) and the reference voltage (second voltage) are switched.

  Reference numeral 107 denotes an npn-type bipolar transistor (hereinafter referred to as a transistor) that turns on and off the transistor 106. A signal line of a pulse signal Z for turning on / off the transistor 107 is connected to the base of the transistor 107. The pulse signal Z is also output from a microcomputer (not shown).

  When the stepping motor (drive motor) 82 is rotated forward by the stepping motor control apparatus configured as described above, each pulse signal is output as shown in the timing chart of FIG. As described above, the pulse signal X is output to the transistor 101. The pulse signal X ′ is output to the transistor 102. The pulse signal Y is output to the transistor 103. The pulse signal Y ′ is output to the transistor 104.

  When the X, X ', Y, and Y' pulse signals are at the H level, the corresponding transistors are on, and when the pulse signals are at the L level, the transistors are off. That is, when the pulse signal is input, the transistor is turned on, and a voltage is applied to the excitation winding.

  More specifically, at time t11, a pulse signal X and a pulse signal Y 'are output to turn on the transistors 101 and 104. At t12, a pulse signal X and a pulse signal Y are output to turn on the transistors 101 and 103. At t13, a pulse signal Y and a pulse signal X 'are output to turn on the transistors 103 and 102. At t14, a pulse signal X 'and a pulse signal Y' are output to turn on the transistors 102 and 104. At t15, a pulse signal X and a pulse signal Y 'are output to turn on the transistors 101 and 104. In this way, the stepping motor (drive motor) 82 rotates forward by sequentially outputting pulse signals, turning on the transistors, and applying voltages to the respective excitation windings.

  At the initial stage of each of the X, X ′, Y, and Y ′ pulse signals, the pulse signal Z is not output, that is, the transistor 106 is in an OFF state. Therefore, the voltage applied to each excitation winding 82 b, 82 c, 82 d, 82 e passes through the electric resistance element 105. The voltage applied to each excitation winding 82b, 82c, 82d, and 82e drops to the voltage (first voltage) lower than the reference voltage (second voltage) by the electric resistance element 105.

  The pulse signal output will be described in detail. T11 and t12 are one pulse width of the pulse signal X, and t12 and t13 are one pulse width of the pulse signal Y. t13 and t14 are one pulse width of the pulse signal X '. t14 and t15 are one pulse width of the pulse signal Y '. The pulse signal X and the pulse signal Y, the pulse signal Y and the pulse signal X ′, the pulse signal X ′ and the pulse signal Y ′, and the pulse signal Y ′ and the pulse signal X are output while being shifted by ½ pulse.

  The pulse signal Z that turns on the transistor 106 of the voltage switching means 108 is not output at the same timing as the X, X ', Y, and Y' pulse signals. For example, the pulse signal Z is not output at the initial stage when the pulse signal X and the pulse signal Y ′ are output, in other words, at the initial stage of t11. The pulse signal Z is output after a certain time t111 has elapsed.

  Therefore, the transistor 106 is not turned on for a certain time t111. For this reason, the voltage applied to the excitation windings 82 b and 82 e passes through the electric resistance element 105. Therefore, the applied voltage drops by the electric resistance element 105 and becomes a voltage (first voltage) lower than the reference voltage (second voltage).

  By applying a low voltage (first voltage), the torque in the rotation direction of the stepping motor 82 becomes a low torque. When the pulse signal Z is output after a certain time t111 has elapsed, the transistor 106 is turned on.

  When the transistor 106 is turned on, the emitter and collector of the transistor 106 are energized as described above. Since a current flows between the emitter and the collector bypassing the electric resistance element 105, the reference voltage (second voltage) is applied to the excitation windings 82b and 82e.

  The pulse signal Z is output for the remaining time t112 of t11 after a certain time t111 has elapsed. That is, the pulse signal Z is output until a ½ pulse is reached after a certain time t111 has elapsed. During this time, since the reference voltage (second voltage) is applied, the torque in the rotation direction of the stepping motor (drive motor) 82 becomes high torque.

  Similarly, the pulse signal Z is not output at the initial stage when the pulse signal X and the pulse signal Y are output, in other words, at the initial stage of t12. The pulse signal Z is output after a certain time t121 has elapsed. Therefore, the transistor 106 is not turned on for a certain time t121. For this reason, the voltage applied to the excitation windings 82 b and 82 c passes through the electric resistance element 105. Therefore, the applied voltage drops by the electric resistance element 105 and becomes a voltage (first voltage) lower than the reference voltage (second voltage).

  By applying a low voltage (first voltage), the torque in the rotational direction of the stepping motor (drive motor) 82 becomes low torque. When the pulse signal Z is output after a certain time t121 has elapsed, the transistor 106 is turned on.

  When the transistor 106 is turned on, the emitter and collector of the transistor 106 are energized as described above. Since a current flows between the emitter and the collector bypassing the electric resistance element 105, the reference voltage (second voltage) is applied to the excitation windings 82b and 82c.

  The pulse signal Z is output for the remaining time t122 of t12 after a certain time t121 has elapsed. That is, the pulse signal Z is output until a ½ pulse is reached after a certain time t121 elapses. During this time, since the reference voltage (second voltage) is applied, the torque in the rotation direction of the stepping motor (drive motor) 82 becomes high torque.

  When the stepping motor 82 rotates in the reverse direction, as shown in FIG. 3, the output pattern of each pulse signal of X, X ', Y, and Y' is opposite to that in the normal rotation. The pulse signal Z for turning on the transistor 106 of the voltage switching means 108 is not output at the same timing as the X, X ', Y, Y' pulse signals as in the case of normal rotation. The pulse signal Z is not output at the initial stage when the pulse signal X and the pulse signal Y 'are output, in other words, at the initial stage of t21. The pulse signal Z is output after a certain time t211 has elapsed.

  Therefore, the transistor 106 is not turned on for a certain time t211. For this reason, the voltage applied to the excitation windings 82 b and 82 e passes through the electric resistance element 105. Therefore, the applied voltage drops by the electric resistance element 105 and becomes a voltage (first voltage) lower than the reference voltage (second voltage).

  By applying a low voltage (first voltage), the torque in the rotational direction of the stepping motor (drive motor) 82 becomes low torque. When the pulse signal Z is output after a certain time t211 has elapsed, the transistor 106 is turned on.

  When the transistor 106 is turned on, the emitter and collector of the transistor 106 are energized as described above. Since a current flows between the emitter and the collector bypassing the electric resistance element 105, the reference voltage (second voltage) is applied to the excitation windings 82b and 82e.

  The pulse signal Z is output for the remaining time t212 of t21 after a certain time t211 has elapsed. That is, the pulse signal Z is output until a ½ pulse is reached after a certain time t211 has elapsed. During this time, since the reference voltage (second voltage) is applied, the torque in the rotation direction of the stepping motor (drive motor) 82 becomes high torque.

  At the timing t121 of t12 in FIG. 2, the voltage applied to the excitation winding 82b is a voltage (first voltage) lower than the reference voltage (second voltage) while being applied. Become. This is effective in balancing the magnetic energy generated between the excitation windings. The same applies to t251 of t25 in FIG.

  As described above, the voltage switching means 108 applies a voltage (first voltage) lower than the reference voltage (second voltage) at the initial stage of pulse output, and after a certain period of time, the reference voltage (second voltage) is applied. The stepping motor (drive motor) 82 is controlled so as to apply the voltage. Thereby, the torque in the rotation direction applied to the rotor 82a of the stepping motor (drive motor) 82 changes from low torque to high torque. For this reason, the torque fluctuation in the initial rotation direction of the pulse output can be reduced, and the rotation noise of the stepping motor (drive motor) 82 generated at the time of torque fluctuation can be reduced.

  Further, after a predetermined time has elapsed after rotating at a low torque, a reference voltage (second voltage) is applied to rotate at a high torque. Thereby, the torque reduction of the whole stepping motor 82 can be suppressed.

Embodiment 2. FIG.
(Air cleaner body structure)
FIG. 4 is a perspective view showing a schematic configuration of an air cleaner provided with a control device for a stepping motor according to Embodiment 2 of the present invention. FIG. 5 is a cross-sectional view of the air cleaner provided with the stepping motor control device according to the second embodiment of the present invention, cut along a cross-section AA shown in FIG. 4. FIG. 6 is an exploded perspective view of an air cleaner provided with a control device for a stepping motor according to Embodiment 2 of the present invention.

  An air cleaner provided with a control device for a stepping motor according to Embodiment 2 of the present invention will be described with reference to FIGS. Note that in each drawing, the same reference numerals are given to the same portions or corresponding portions, and a part of the description may be omitted.

  The air cleaner 100 includes a main body 1 and a support base 2. As shown in FIG. 4, the main body 1 has a rectangular parallelepiped shape that is long in the vertical direction. A support base 2 is provided below the rectangular parallelepiped main body 1. The support base 2 supports the main body 1 so that the direction of the main body 1 can be changed. The rotating structure of the main body 1 and the support base 2 will be described in detail later with reference to FIGS.

  As shown in FIG. 6, the main body 1 is configured to cover four rectangular parallelepiped long surfaces with a cover member. Specifically, the front surface is covered with a front panel 3, the side surface is a side cover 4, the side surface cover 5, and the rear surface is a rear cover 6, which are integrally formed by resin molding.

  A front main body case 7 and a rear main body case 8 are provided as main structures of the main body 1 inside the four surfaces covered with the front panel 3, the side cover 4, the side cover 5, and the rear cover 6. The front main body case 7 and the rear main body case 8 are integrally formed by resin molding.

  An upper fan unit 9 composed of a fan 21, a fan motor 22 and a motor holding member 23, and a lower fan unit 10 composed of a fan 24, a fan motor 25 and a motor holding member 26 are attached to the rear body case 8.

  The fan motor 22 of the upper fan unit 9 is fixed so that a part thereof enters an upper fan casing rear plate recess 8c provided in the upper fan casing rear plate 8b of the upper fan casing 8a. The fan motor 22 passes through the fan motor rotating shaft 22 a through a hole (not shown) of the motor holding member 23 and is fixed by the motor holding member 23. Thereafter, the motor holding member 23 is attached to the upper fan casing rear plate 8b with screws (not shown) (not shown).

  Then, a washer 27a for preventing the fan 21 from wobbling, a fan 21 and a washer 27b for preventing the fan 21 from wobbling are passed through the fan motor rotating shaft 22a. The upper fan unit 9 is attached by fixing the fan 21 to the fan motor rotating shaft 22a with the nut 28 shown in FIG.

  Similarly, the fan motor 25 of the lower fan unit 10 is fixed so that a part thereof enters a lower fan casing rear plate recess 8f provided on the lower fan casing rear plate 8e of the lower fan casing 8d. The fan motor 25 is fixed by the motor holding member 26 through the fan motor rotating shaft 25 a through a hole (not shown) of the motor holding member 26. Thereafter, the motor holding member 26 is attached to the lower fan casing rear plate 8e with a fastening part (not shown) such as a screw.

  Then, a washer 27a for preventing the fan 24 from wobbling, a fan 24 and a washer 27b for preventing the fan 24 from wobbling are passed through the fan motor rotating shaft 25a. The lower fan unit 10 is attached by fixing the fan 24 to the fan motor rotating shaft 25a with the nut 28 shown in FIG.

  The front main body case 7 is attached with screws (fastening parts) (not shown) in front of the rear main body case 8 to which the upper fan unit 9 and the lower fan unit 10 are attached. The front main body case 7 includes an upper fan casing cover 7a that covers the upper fan casing 8a and a lower fan casing cover 7c that covers the lower fan casing 8d.

  The upper fan casing cover 7 a is provided with an upper fan casing cover opening 7 b for supplying air to the upper fan unit 9. The lower fan casing cover 7 c is provided with a lower fan casing cover opening 7 d for supplying air to the lower fan unit 10.

  The fan 21 of the upper fan unit 9 is a sirocco fan that is a multi-blade centrifugal fan that draws air from the vertical direction of the rotating shaft and sends it in the centrifugal direction. A scroll space for the upper fan unit 9 to blow air is formed by the upper fan casing 8a and the upper fan casing cover 7a.

  Similarly, the fan 24 of the lower fan unit 10 is also a sirocco fan. A scroll space for the lower fan unit 10 to blow air is formed by the lower fan casing 8d and the lower fan casing cover 7c.

  As shown in FIG. 5, a front delivery port 64 is provided above the scroll space formed by the upper fan casing 8a and the upper fan casing cover 7a. The front delivery port 64 is for the upper fan unit 9 to send out the air sucked from the upper fan casing cover opening 7b in the vertical direction of the rotation axis in the centrifugal direction.

  A ventilation path 66 is provided above the scroll space formed by the lower fan casing 8d and the lower fan casing cover 7c. The ventilation path 66 is formed of a rear cover 6 attached to the rear main body case 8 with screws (fastening parts) (not shown) and an upper fan casing rear plate 8b.

  The ventilation path 66 is an air path that guides the air sucked by the lower fan unit 10 to the rear outlet 65 through the back surface of the scroll space formed by the upper fan casing 8a and the upper fan casing cover 7a. The rear delivery port 65 is provided at the same height as the front delivery port 64.

  The scroll space formed by the lower fan casing 8d and the lower fan casing cover 7c is shifted rearward from the scroll space formed by the upper fan casing 8a and the upper fan casing cover 7a. Are arranged.

  With this arrangement, the air path resistance of air can be suppressed without sharply bending the path from the scroll space formed by the lower fan casing 8d and the lower fan casing cover 7c to the ventilation path 66.

  A guard net 31 is attached above the front delivery port 64 and the rear delivery port 65. The guard net 31 does not allow foreign matter to enter the scroll space formed by the lower fan casing 8d and the lower fan casing cover 7c via the scroll space formed by the upper fan casing 8a and the upper fan casing cover 7a and the ventilation path 66. It is for doing so.

  An upper unit 40 is provided above the guard net 31. The upper unit 40 includes a front louver 62, a rear louver 63, and a front louver drive motor 54a and a rear louver drive motor 54b for driving them.

  The front louver 62 is for sending the air sent from the upper fan unit 9 delivered from the front delivery port 64 from the front diagonally upward to the upper range, for example, the front diagonally upward 45 ° to 90 ° range. Similarly, the rear louver 63 blows the air sent from the lower fan unit 10 sent from the rear outlet 65 from the front diagonally upward to the upper range, for example, the front diagonally upward 45 ° to 90 ° range. It is. The front louver 62 and the rear louver 63 are closed when the air purifier 100 is not operating. The front louver 62 and the rear louver 63 are configured to open as shown in FIG. 4 when the air purifier 100 is in operation.

  Furthermore, the upper unit 40 includes a human detection sensor 45. The human detection sensor 45 detects the position of a person in the living room in which the air purifier 100 is placed in order to determine the direction in which the air purifier 100 sucks and sends out the air. Thereby, the delivery direction of the air sent out toward the position where the human is detected is changed. More specifically, the air sending direction is changed by rotating the main body 1 so that the front panel 3 of the main body 1 faces in the direction of the position where the person is present. In addition, rotating the main body 1 to change the air sending direction will be described later.

  An operation display unit 41 is provided in front of the upper surface of the upper unit 40. The operation display unit 41 includes an operation board unit 42, a plurality of operation switches 43, and a design sheet 44. Input such as various selections for operating the air purifier 100 is performed by the operation switch 43. An operation signal from the operation board unit 42 is sent to the control board 49. Further, the input information and the operating status are displayed on a display means (not shown).

  As shown in FIG. 6, the control board 49 is incorporated in the board cases 48 and 50 and covered with the covers 47 and 51, thereby constituting the control board unit 46. In the control board 49, a microcomputer 49a, an output circuit 49b, and the like, which will be described later, constitute a control circuit and the like. The output circuit 49b is composed of electronic components mounted on the board.

  The substrate cases 48 and 50 are made of a flame retardant resin. Covers 47 and 51 are made of metal. The control board unit 46 has an air path between the scroll space formed by the upper fan casing 8a and the upper fan casing cover 7a and the scroll space formed by the lower fan casing 8d and the lower fan casing cover 7c shown in FIG. It is accommodated in the space 53 that does not affect the routing of the.

  The control board 49 is connected to the operation board unit 42 through a connection line (not shown) covered with a lead wire cover 52.

  Next, the side cover 4 is attached to the left side and the side cover 5 is attached to the right side of the front main body case 7 and the rear main body case 8 when viewed from the front side. Each of the side covers 4 and 5 has a plurality of insertion pieces (not shown), and the insertion pieces are inserted and attached to engaging portions provided on the rear cover 6. The side covers 4 and 5 are attached to the front main body case 7 with screws (fastening parts) (not shown) from the front side. When the side covers 4 and 5 are attached, the screws (fastening parts) to which the rear cover 6 is attached are concealed by the side covers 4 and 5 and are not visible in appearance, so that the design is improved.

  The side cover 4 is provided with a concave handle portion 4 a that is recessed on the inner side of the main body 1. Similarly, the side cover 5 is provided with a concave handle 5a. When the user moves the air purifier 100, he / she can carry the handle 4a and the handle 5a with his / her hands. A design sheet 4 b is provided on the upper portion of the side cover 4. A design sheet 5 b is provided on the upper portion of the side cover 5. Although the design sheets 4b and 5b are for improving the appearance, they are not always necessary, and the upper portions of the side covers 4 and 5 may be used as they are.

  Next, as shown in FIG. 6, an upper fan guard 32 is provided in front of the upper fan casing cover opening 7b. A lower fan guard 33 is provided in front of the lower fan casing cover opening 7d. The upper fan guard 32 and the lower fan guard 33 are for preventing foreign matter from entering the scroll space.

  Further, a deodorizing filter 34, a HEPA filter 35, and pre-filters 36a and 36b are provided in front thereof. Large dust contained in the air sucked by the pre-filters 36a and 36b is collected, the odor of the air sucked by the deodorizing filter 34 is adsorbed to reduce the odor, and further fine dust is collected by the HEPA filter 35. Purify and discharge.

  A front panel 3 is detachably attached in front of the filters so as to cover them. Filters can be easily replaced and cleaned by removing the front panel 3. Further, when the front panel 3 is attached, the screws (fastening parts) attached with the side covers 4 and 5 from the front side are hidden in the front panel 3 and are not visible in appearance, so that the design is improved.

  A concave drop is provided above the front panel 3. The concave drop has an opening in the center. With the front panel 3 attached, the human detection sensor 45 protrudes from the opening.

  As shown in FIG. 6, a recess 4 c is provided in front of the side cover 4. Similarly, a recess 5 c is provided in front of the side cover 5. As shown in FIG. 4, the front panel 3 and the recess 4 c in front of the side cover 4 constitute an intake port 61. The air inlet 61 sucks air that is sucked into a scroll space formed by the upper fan casing 8a and the upper fan casing cover 7a and into a scroll space formed by the lower fan casing 8d and the lower fan casing cover 7c. Although not shown, the front panel 3 and the concave portion 5c in front of the side cover 5 similarly form an intake port.

(Main body support base structure)
Next, the lower part of the main body 1 and the support base 2 that supports the main body 1 will be described with reference to FIGS. In some cases, description will be made with reference to the above-described drawings.

  FIG. 7 is a perspective view of an air cleaner main body support base to which a stepping motor controlled by the control device of the air cleaner having the stepping motor control device according to the second embodiment of the present invention is attached. FIG. 8 is an exploded perspective view of the air cleaner body support base shown in FIG. (A) of FIG. 9 is the top view seen from the upper direction of the air cleaner main body support stand shown in FIG. FIG. 9B is a cross-sectional view taken along a cross section BB shown in the plan view of FIG.

  The support base 2 supports the main body 1 in a rotatable manner. The main body 1 is rotated by a stepping motor (drive motor) 82 described later.

  7 to 9, reference numeral 29 denotes a lower main body case formed by resin molding. The lower body case 29 is fixed so as to be sandwiched between the lower part of the front body case 7 and the lower part of the rear body case 8 shown in FIG. The lower body case 29 is attached to the body 1 as shown in FIGS. An annular sliding plate 74 made of metal is attached to the lower main body case 29 with screws (fastening parts).

  The lower body case 29 is provided with a drive unit support portion 29a. The drive unit support portion 29a protrudes from below to above (it is recessed when viewed from below). The main body rotation drive unit 81 is attached to the drive unit support portion 29a from below with screws (fastening parts). The main body rotation drive unit 81 includes a stepping motor (drive motor) 82, a connecting shaft 83, a pinion gear 84, and a bearing 85.

  The connecting shaft 83 transmits the drive torque of the stepping motor (drive motor) 82 to the pinion gear 84. The connecting shaft 83 is attached to the pinion gear 84. One end of the connecting shaft 83 is connected to a stepping motor (drive motor) 82. The other end of the connecting shaft 83 is rotatably supported by the bearing 85. The bearing 85 is attached to the holding member 86.

  The support base 2 includes a flat base base 71 having a flat rectangular shape that is long in the left-right direction and short in the front-rear direction. The base table 71 is provided with a circular recess. A rotation center axis guide 73 is provided at the center of the circular recess. A rotation center shaft 76 is attached to the rotation center shaft guide 73 with a fastening part such as a screw.

  The lower body case 29 is provided with a rotation center bearing 29f at the center. When the lower body case 29 is attached to the base base 71, the rotation center bearing 29f is rotatably inserted into the rotation center shaft 76. The lower main body case 29 is inserted into the rotation center bearing 29f. The stopper 79 is attached so as to sandwich a groove-like recess 76a provided in the rotation center shaft 76. The stopper 79 prevents the lower main body case 29 from coming off from the base base 71.

  The lower body case 29 is provided with the same number of body-side wheel holding portions 29e as the plurality of body-side wheels 77. The plurality of main body side wheel holding portions 29e rotatably hold the plurality of main body side wheels 77. The main body side wheel 77 is held by the lower main body case 29. As shown in FIG. 9B, the main body side wheel 77 contacts the bottom of the support base 2 to assist the rotation of the main body 1.

  The base table 71 is provided with the same number of support table-side wheel holding portions 71f as the plurality of support table-side wheels 78. The plurality of support base side wheel holding portions 71f rotatably hold the plurality of support base side wheels 78. The support base side wheel 78 is held by the support base side wheel holding portion 71f. As shown in FIG. 9B, the support base side wheel 78 contacts the lower surface side of the sliding plate 74 to assist the rotation of the main body 1.

  The base table 71 is provided with a sliding plate holding part 71a. The sliding plate 74 is attached to the sliding plate pressing and holding portion 71 a by a fastening component such as a screw, so that the edge portion is pressed so that the lower body case 29 does not come off the base base 71. Yes. However, the sliding plate 74 is not fixed, but is rotatably held.

  A rack gear 72 is provided along the inner peripheral wall of the edge of the recess of the base base 71. The rotation center bearing 29f of the lower body case 29 is inserted into the rotation center shaft 76, the sliding plate 74 is rotatably held by the sliding plate holder 75, and a stopper 79 is provided so that the lower body case 29 does not come off. In a mounted state, the rack gear 72 and the pinion gear 84 of the main body rotation drive unit 81 are engaged with each other.

  Next, in the lower body case 29, position detecting means 80a, 80b, 80c made of, for example, photo interrupters are held by position detecting means holding portions 29b, 29c, 29d, respectively.

  The photo interrupter has a light emitting part and a light receiving part. The photo interrupter is a sensor that detects whether the light emitted from the light emitting unit is received by the light receiving unit or not. The position detecting means 80a, 80b, 80c are provided at equal intervals on a concentric circle from the center of the rotation center shaft 76.

  The base table 71 is provided with rib-shaped blocking walls 71b for blocking the light emitting portions and the light receiving portions of the position detecting means 80a, 80b, 80c so as to protrude upward from the bottom surface. Position blocking slits 71c, 71d, 71e through which light emitted from the light emitting portions of the position detectors 80a, 80b, 80c can pass are provided at equal intervals on the blocking wall 71b. The position detection slits 71 c, 71 d, 71 e are provided concentrically from the center of the rotation center shaft 76.

  As shown in FIG. 4, it is assumed that the main body 1 is in the reference state when the front panel 3 and the base 71 of the support 2 are parallel to one side in the longitudinal direction. In the reference state, the position detecting means 80a is arranged corresponding to the position detecting slit 71c. In the reference state, the position detecting means 80b is arranged corresponding to the position detecting slit 71d. In the reference state, the position detecting means 80c is arranged corresponding to the position detecting slit 71e.

  In this reference state, the position detectors 80a, 80b, and 80c are all in a state in which the light receiving unit can receive light emitted from the light emitting unit. Therefore, when all of the position detection means 80a, 80b, and 80c are in the light receiving state, it can be determined that the main body 1 is in the reference state position.

  That is, the position detection means 80a, 80b, and 80c can determine that the main body 1 is not in the reference state unless the light receiving unit can receive the light emitted from the light emitting unit. Thereby, the main body 1 can be returned to the position in the reference state by rotating the main body 1 so as to return to the position where all the position detecting means 80a, 80b, 80c can receive light.

(Air cleaner operation)
Next, operation | movement of the air cleaner 100 is demonstrated using FIG. FIG. 10 is a schematic block diagram of an air cleaner provided with a control device for a stepping motor according to Embodiment 2 of the present invention.

  A microcomputer 49a is mounted on the control board 49, and a control circuit such as an output circuit 49b is composed of a wiring pattern (not shown) provided on the board and mounted electronic components. The stepping motor control apparatus according to the first embodiment of the present invention is also configured to be included in the control circuit of the control board 49 except for the stepping motor (drive motor) 82.

  The output circuit 49b is connected to the upper fan unit 9, the lower fan unit 10, the front louver drive motor 54a, the rear louver drive motor 54b, and a stepping motor (drive motor) 82.

  When the air purifier 100 is operated, first, when a plug (not shown) of the power cord 55 is inserted into an outlet, the position detection means 80a, 80b, 80c detect whether the main body 1 is facing front.

  If the main body 1 is not facing the front, the microcomputer 49a drives the stepping motor (drive motor) 82 to rotate the main body 1 so that the main body 1 faces the front, and when the main body 1 faces the front, It becomes. When the main body 1 is in a state of facing the front, the standby state is left as it is.

  When the user operates the operation switch 43 from the standby state, an input signal is sent to the microcomputer 49 a of the control board 49 through the operation board unit 42. The front louver drive motor 54a and the rear louver drive motor 54b are driven, and the front louver 62 and the rear louver 63 are opened so as to blow the air to be sent in the diagonally upward direction.

  Thereafter, the upper fan unit 9 and the lower fan unit 10 are driven to start sucking air. External air is sucked from an intake port 61 formed by the front panel 3 and the front recess 3 c of the side cover 4 and an unillustrated intake port formed by the front panel 3 and the front recess 5 c of the side cover 5. . The sucked air is purified through the pre-filters 36a and 36b, the deodorizing filter 34, and the HEPA filter 35.

  The purified air further passes through the upper fan guard 32 and the upper fan casing cover opening 7b and then passes into the upper fan unit 9, and passes through the lower fan guard 33 and the lower fan casing cover opening 7d and sucks into the lower fan unit 10. Be turned.

  The purified air sucked into the upper fan unit 9 passes through the guard net 31, is sent out from the front delivery port 64, and is blown forward and obliquely upward by the front louver 62. Similarly, the purified air sucked into the lower fan unit 10 passes through the guard net 31, is sent out from the rear side outlet 65, and is blown forward and obliquely upward by the rear side louver 63.

  Thereafter, the human detection sensor 45 starts sensing. The person detection sensor 45 detects whether a person is present in the living room where the air purifier 100 is placed. If it is not detected that there is a person, the microcomputer 49a does not rotate the main body 1 and the front louver 62 and the rear louver 63 face obliquely upward at approximately 45 degrees so that the sent air can reach farther. Thus, the front louver drive motor 54a and the rear louver drive motor 54b are driven.

  When the person detection sensor 45 detects that a person is present, the person detection sensor 45 sends a signal related to the position information of the person to the microcomputer 49 a of the control board 49 via the operation board unit 42. Based on the position information, the microcomputer 49a drives a stepping motor (drive motor) 82 to rotate the main body 1 so that the air flows in the direction in which the person is present.

  When the stepping motor (drive motor) 82 is driven, the pinion gear 84 attached to the connecting shaft 83 connected to the stepping motor (drive motor) 82 rotates. The pinion gear 84 moves while rotating by meshing with the rack gear 72.

  As the pinion gear 84 moves, the lower main body case 29 rotates about the rotation center shaft 76. Since the main body 1 is fastened to the lower main body case 29, the main body 1 rotates with respect to the support base 2 following the rotation of the lower main body case 29. Then, the front panel of the main body 1 faces in the direction of the position where the person is present, and the air blows in the direction of the person.

  Then, the front louver drive motor 54a and the rear louver drive motor 54b are driven so that the front louver 62 and the rear louver 63 face upward approximately 90 degrees so that the sent air does not directly hit a person.

  As described above, the air cleaner 100 according to the second embodiment of the present invention includes the stepping motor control device according to the first embodiment of the present invention. When the control device controls the driving of the stepping motor (drive motor) 82 when the main body 1 rotates with respect to the support base 2, the voltage switching means 108 initially outputs a reference voltage (second voltage). The stepping motor 82 is controlled so that a reference voltage (second voltage) is applied after a certain time has elapsed after that. As a result, the torque in the rotational direction applied to the rotor 82a of the stepping motor 82 changes from a low torque to a high torque. The torque fluctuation in the initial rotation direction of the pulse output can be reduced, and the rotation sound of the stepping motor 82 generated at the time of torque fluctuation can be reduced. For this reason, even if the main body 1 of the air purifier 100 rotates in the room, the rotating sound of the stepping motor 82 generated at that time is not bothering.

  The present invention can be used for, for example, a control device that controls a stepping motor and an air cleaner incorporating the stepping motor.

  DESCRIPTION OF SYMBOLS 1 Main body, 2 Support stand, 3 Front panel, 4 Side cover, 4a Handle part, 4b Design sheet, 4c Concave part, 5 Side cover, 5a Hand part, 5b Design sheet, 5c Concave part, 6 Rear cover, 7 Front part case 8 Rear body case, 7a Upper fan casing cover, 7b Upper fan casing cover opening, 7c Lower fan casing cover, 7d Lower fan casing cover opening, 8a Upper fan casing, 8b Upper fan casing rear plate, 8c Upper fan casing rear plate Recess, 8d Lower fan casing, 8e Lower fan casing rear plate, 8f Lower fan casing rear plate recess, 9 Upper fan unit, 10 Lower fan unit, 21 Fan, 22 Fan motor, 22a Fan motor rotating shaft, 23 Motor holding Members, 24 25, fan motor, 25a fan motor rotating shaft, 26 motor holding member, 27a washer, 27b washer, 28 nut, 29 lower body case, 29a drive unit support section, 29b position detection means holding section, 29c position detection Means holding part, 29d position detecting means holding part, 29e main body side wheel holding part, 29f rotation center bearing, 31 guard net, 32 upper fan guard, 33 lower fan guard, 34 deodorizing filter, 35 HEPA filter, 36a pre-filter, 36b Pre-filter, 40 Upper unit, 41 Operation display unit, 42 Operation board unit, 43 Operation switch, 44 Design sheet, 45 Person detection sensor, 46 Control board unit, 47 Cover, 48 Board case, 49 Control board, 49a Ma 49, output circuit, 50 board case, 51 cover, 52 lead wire cover, 53 space, 54a front louver drive motor, 54b rear louver drive motor, 55 power cord, 61 air inlet, 62 front louver, 63 rear louver 64 Front side outlet, 65 Rear side outlet, 66 Ventilation path, 71 Base base, 71a Sliding plate holding part, 71b Blocking wall, 71c Position detection slit, 71d Position detection slit, 71e Position detection slit, 71f Support stand side wheel holding part, 72 Rack gear, 73 Rotation center axis guide, 74 Slide plate, 75 Slide plate press, 76 Rotation center axis, 76a Groove-shaped recess, 77 Body side wheel, 78 Support stand side wheel 79 Stopper 80a Position detection means 80b Position detection means 80c Position detection means 81 Main body rotation drive unit, 82 stepping motor (drive motor), 82a rotor, 82b excitation winding, 82c excitation winding, 82d excitation winding, 82e excitation winding, 83 connecting shaft, 84 pinion gear, 85 bearing, 86 holding Member, 100 air purifier, 101 transistor, 102 transistor, 103 transistor, 104 transistor, 105 electric resistance element, 106 transistor, 107 transistor, 108 voltage switching means, 111 power supply

Claims (5)

A power supply that outputs a voltage for exciting the windings of the stepping motor,
Voltage switching means capable of switching a voltage output from the power source and applied to the winding ;
With
In each phase of pulse output for driving the stepping motor, the voltage switching means switches the voltage applied to the winding in each phase for the first voltage, and switches the voltage to the first voltage. After a lapse of time, the voltage applied to the winding in each phase is switched to a second voltage higher than the first voltage, and further, the winding is applied to the winding in each phase in synchronization with the start of the pulse output of the other phase. The applied voltage is switched from the second voltage to the first voltage, and the voltage applied to the winding in the other phase after a certain period of time has elapsed from the start of the pulse output of the other phase. A control device for a stepping motor that switches a voltage applied to the winding in each phase from the first voltage to the second voltage in synchronization with a change from a voltage to the second voltage . A power supply that outputs a voltage for exciting the windings of the stepping motor,
Voltage switching means capable of switching a voltage output from the power source and applied to the winding ;
With
The power supply outputs a reference voltage,
In each phase of the pulse output for driving the stepping motor, the voltage switching means sets the voltage applied to the winding to be higher than the reference voltage for an initial fixed time and a fixed time from the start of pulse output of another phase. A stepping motor that switches to a low voltage and switches the voltage applied to the winding to the reference voltage after the initial fixed time has elapsed and after the fixed time has elapsed since the start of pulse output of the other phase . Control device.   The voltage switching means includes an electrical resistance element, and switches whether the voltage applied to the winding is applied via the electrical resistance element or not via the electrical resistance element. A control device for a stepping motor according to claim 1 or 2.   The said voltage switching means is provided with the transistor which switches whether the said voltage applied to the said winding is applied via the said electrical resistance element, or not via the said electrical resistance element. Stepping motor control device. A control device for a stepping motor according to any one of claims 1 to 4,
The stepping motor;
With
An air cleaner in which a main body rotates by driving the stepping motor.

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