JP2010266153A - Method and device of drive motor, and air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor drive method, a motor drive device and an air conditioner having the motor drive device capable of allowing a motor to quickly and smoothly reach a target rotational frequency without overshooting the target rotational frequency at starting. <P>SOLUTION: A rotational frequency command value at starting according to the target rotational frequency of the motor, and a reference rotational frequency command value to rotate the motor at the target rotational frequency are stored, the motor is started on the basis of the stored rotational frequency command value at starting, and the rotational frequency command value is kept for 1.5 seconds. Then the rotational frequency command value of the motor is updated by an increment according to the deviation of the target rotational frequency to the rotational frequency detected every 0.5 seconds thereafter, and the rotational frequency command value at starting is increased and decreased according to a positive value and a negative value of the deviation of the updated rotational frequency command value to the stored reference rotational frequency command value when the deviation is within a prescribed range. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention stores a rotational speed command value at the time of start-up and rotationally drives a motor started based on the stored rotational speed command value, a motor drive device, and an air conditioner including the motor drive device. Related to the machine.

  In recent years, air conditioners such as air conditioners, humidifiers, and dehumidifiers, including air purifiers that purify indoor air, have been widely used. For example, in an air purifier, a blower is arranged inside a ventilation path extending from an opening on the front of the main body to a blowout port on the upper portion of the main body, and an air filter is attached to the opening. In such an air purifier, when the blower is operated, air in the room, which is external air, is sucked into the air passage through the air filter, and the sucked air is blown out into the room. At that time, harmful substances and dust contained in the air are collected, adsorbed and decomposed by the air filter, so that the indoor air is purified.

  In general, in an air cleaner, the motor drive device detects the rotation speed (control amount) of the blower motor at a predetermined period, and the rotation speed according to the deviation between the detected rotation speed and the target rotation speed (target value). Feedback control for driving the motor is performed based on the command value (operation amount). In this case, depending on the response characteristics of the feedback loop, a considerable amount of time may be required for the motor speed to converge to the target speed. Therefore, before the feedback control is started, the motor is driven based on the rotational speed command value according to the target rotational speed in order to smoothly reach the target rotational speed when the blower motor is started. There is a way.

  For example, in Patent Document 1, the rotation speed command value at the time of activation is updated according to the detected deviation between the rotation speed of the motor and the target rotation speed, and feedback control is performed at the time of next activation and when the target rotation speed is changed. A technique for driving the motor based on the updated rotational speed command value at the time of starting is disclosed. With this technique, the start-up of the motor and the change of the rotation speed are performed relatively smoothly, and the rotation speed command value at the start for obtaining the target rotation speed is corrected every time the start-up and the rotation speed are changed. It becomes like this.

JP-A-6-70594

  However, since the feedback control is originally performed so that the detected rotation speed matches the target rotation speed, the technique disclosed in Patent Document 1 detects the detected motor before starting the feedback control. It is necessary to calculate the deviation of the rotation speed and the target rotation speed. As a result, within a period in which the detected rotation speed (control amount) and target rotation speed (target value) are wide, deviations of the respective rotation speeds are calculated and the rotation speed command value at the time of activation is updated. However, since the calculation of the deviation is performed once when the rotational speed reaches a substantially constant value every time the motor is started or the rotational speed is changed, the rotational speed command value at the time of startup is set to an appropriate value. In order to converge to the above, it is necessary to repeatedly start or change the target rotational speed.

  On the other hand, since the motor has a tendency that the rotational speed gradually increases from the start to the steady operation, the rotational speed command value for rotating the motor at the target rotational speed gradually decreases. . In other words, the speed command value at the time of start-up, which is gradually updated so that the motor reaches the target speed at the next start-up and when the speed is changed, is larger than the speed command value at the steady operation of the motor. This tends to be a value, and this causes overshoot in the rotational speed of the motor in the feedback control at the next startup and when the rotational speed is changed. In such a case, there is a problem that the time until the target rotational speed is reached by the feedback control is increased, and an annoying change in the wind noise of the blower makes the user uncomfortable.

  The present invention has been made in view of such circumstances, and the object of the present invention is to reach the target rotational speed quickly and smoothly without overshooting the target rotational speed when the motor is started. The present invention provides a motor driving method, a motor driving device, and an air conditioner including the motor driving device.

  The motor driving method according to the present invention stores a rotational speed command value at the start of a motor to be driven based on the rotational speed command value in accordance with a target rotational speed, and stores the stored rotational speed command value at the time of startup. In the motor driving method for detecting the rotation speed of the motor to be started based on the rotation speed and driving the motor to rotate based on the rotation speed command value updated according to the detected rotation speed and the deviation of the target rotation speed A reference rotation speed command value for rotating the motor at the target rotation speed is stored, and the start time is determined according to a deviation between the stored reference rotation speed command value and the updated rotation speed command value. The rotation speed command value is updated.

  The motor driving method according to the present invention integrates the time during which the motor is rotationally driven, determines whether or not the integrated value is equal to or greater than a predetermined time, and if it is determined to be equal to or greater, notifies a predetermined warning, When the predetermined operation is received, the integrated value is initialized when the predetermined operation is received, and when the operation is initialized, the rotation speed command value at the start is set to a predetermined value.

  The motor drive device according to the present invention stores a rotation speed command value at the start of a motor to be driven based on the rotation speed command value according to a target rotation speed, and stores the stored rotation speed command value. In the motor drive device that detects the rotation speed of the motor to be started based on the rotation speed and drives the motor to rotate based on the rotation speed command value updated according to the detected rotation speed and the deviation of the target rotation speed And means for storing a reference rotational speed command value for rotating the motor at the target rotational speed, according to a deviation between the reference rotational speed command value stored by the means and the updated rotational speed command value. Thus, the rotational speed command value at the time of starting is updated.

  The motor drive device according to the present invention includes a means for accumulating the time during which the motor is driven to rotate, a means for determining whether the integrated value of the means is equal to or greater than a predetermined time, and a determination that the means is the above. A means for notifying a predetermined warning, a means for receiving a predetermined operation, a means for initializing the integrated value when the means is received, and a rotation at the time of startup when the means is initialized. Means for setting the numerical command value to a predetermined value.

  An air conditioner according to the present invention includes a motor driving device according to the above-described invention, a blower having a motor that is rotationally driven by the motor driving device, and an air filter that cleans the air sucked and blown out by the blower. It is characterized by providing.

In the present invention, the rotational speed command value at the start-up according to the target rotational speed of the motor and the reference rotational speed command value for rotating the motor at the target rotational speed are stored. The rotational speed of the motor to be started is detected based on the rotational speed command value at the time of startup, and the rotational speed command value of the motor to be rotationally driven is updated according to the deviation between the detected rotational speed and the target rotational speed. The rotation speed command value at the time of start-up is updated according to the stored difference between the reference rotation speed command value and the updated rotation speed command value.
As a result, when the rotational speed command value that is sequentially updated is larger (or smaller) than the reference rotational speed command value, the rotational speed command value at the next startup increases (or decreases) from the rotational speed command value at the latest startup. ) To update.
For this reason, every time the rotational speed command value given to the motor is updated, the rotational speed command value at the time of startup can be corrected and converged to an appropriate value. In this case, since the rotational speed command value that is sequentially updated gradually decreases until the motor reaches steady operation and converges to a constant value, the rotational speed command value at the time of startup is changed to the rotational speed in the feedback control of the motor. Can be set to a small value that does not cause overshoot.
Further, for example, even when the motor load increases (or decreases) while the motor repeats starting and stopping, the rotational speed command value at the time of starting can be appropriately increased (or decreased). .

In the present invention, when the integrated value obtained by integrating the time during which the motor is rotationally driven is equal to or longer than the predetermined time, a predetermined warning is notified. On the other hand, when a predetermined operation is received, the integrated value is initialized and the rotation speed command value at the time of activation is set to a predetermined value.
Thus, for example, an alarm can be output when a predetermined maintenance time is required, and the user's operation can be received to return the rotation speed command value at the time of startup to a predetermined initial value.
For this reason, the predetermined time is set as a time corresponding to the maintenance time for the factor that fluctuates the number of rotations of the motor, and when the user who receives the alarm eliminates the factor, the user performs a predetermined operation. In this case, the rotational speed command value at the time of start-up that fluctuates reflecting the above factors can be quickly returned to the initial value.

In the present invention, the motor driving device according to the above-described invention drives the motor of the blower, and the air sucked by the blower is purified by the air filter and blown out.
Thus, a motor drive device that can reach the target rotational speed quickly and smoothly without overshooting the target rotational speed when the motor is started is applied to the air conditioner.

According to the present invention, when the rotational speed command value that is sequentially updated is larger (or smaller) than the reference rotational speed command value, the rotational speed command value at the next startup increases from the rotational speed command value at the latest startup. Since it is updated so as to (or decrease), it is possible to correct the rotational speed command value at the time of start-up every time the rotational speed command value given to the motor is updated and to converge it to an appropriate value. In this case, since the rotational speed command value that is sequentially updated gradually decreases until the motor reaches steady operation and converges to a constant value, the rotational speed command value at the time of startup is changed to the rotational speed in the feedback control of the motor. Can be set to a small value that does not cause overshoot.
Further, for example, even when the motor load increases (or decreases) while the motor repeats starting and stopping, the rotational speed command value at the time of starting can be appropriately increased (or decreased). .
Therefore, the target rotational speed can be reached quickly and smoothly without overshooting the target rotational speed when the motor is started.

It is the schematic perspective view which looked at the air cleaner which concerns on embodiment of this invention from the front upper right. It is an abbreviated right side sectional view showing an internal configuration of a main part which removed a front panel. It is explanatory drawing which shows typically the connection of the motor drive device which an air cleaner has, a power supply system, and a motor. It is a block diagram which shows the structural example of the motor drive device which drives a motor. It is explanatory drawing which shows typically the drive pulse which a drive signal output part gives to a motor. It is a graph which shows a response | compatibility with the rotation speed command value memorize | stored in ROM or RAM, and the air volume of each operation mode which concerns on air purification. It is explanatory drawing which shows a mode that a rotation speed command value is controlled typically. It is a graph which shows a response | compatibility with the air volume of each operation mode which concerns on air purification, and the target rotation speed. It is a graph which shows the relationship between the deviation of the target rotation speed with respect to the detected rotation speed, and the increment with respect to the rotation speed command value about each air volume. It is a flowchart which shows the process sequence of CPU which drives a motor. It is a flowchart which shows the process sequence of CPU which drives a motor. It is a flowchart which shows the process sequence of CPU which drives a motor. It is a flowchart which shows the process sequence of CPU which concerns on the subroutine of filter alarm cancellation.

Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments thereof.
FIG. 1 is a schematic perspective view of an air cleaner according to an embodiment of the present invention as viewed from the front upper right, and FIG. 2 is a schematic right sectional view showing the internal configuration of the main body 11 with the front panel 12 removed. FIG. In FIG. 2, the direction in which air flows is indicated by white arrows. In the figure, reference numeral 1 denotes an air purifier. The air purifier 1 includes a vertically long main body 11, and an operation panel 111 that accepts a user's operation is disposed on the upper portion of the main body 11.

  The front side of the main body 11 is covered with a front panel 12 having a rectangular shape in front view with a slight gap, and this gap forms a side air inlet 122 that sucks external air from the peripheral edge of the front panel 12. It is. At the center of the front panel 12, a vertical grid-shaped front air inlet 121 for sucking outside air from the front side is formed.

  The main body 11 has a rectangular opening on the front side, and an air filter 13 is accommodated inside the opening. Behind the air filter 13, a ventilation panel 14 having a plurality of ventilation holes formed in the center is arranged. The main body 11 also includes a motor 16 disposed behind the ventilation panel 14 with the rotation axis directed in the front-rear direction, and the front side of the rotation axis sucks air from the front side of the ventilation hole of the ventilation panel 14. A fan 15 that exhausts air is attached above the rotating shaft.

  Above the fan 15, an air passage 17 surrounded by an upper portion of the ventilation panel 14, a rear wall 114 of the main body portion 11, and a side wall (not shown) is formed, and the upper portion of the air passage 17 is the back surface of the main body portion 11. The first air outlet 113 that blows air upward at the upper part of the side and the second air outlet 112 that blows air that diverges obliquely upward and forward from the vicinity of the first air outlet 113 to the front side of the main body 11 are connected. .

  When the fan 15 is driven by the motor 16, external air is sucked from the front air inlet 121 and the side air inlet 122 by the negative pressure generated by the fan 15. The sucked air is purified by the air filter 13, passes through the ventilation holes of the ventilation panel 14, flows into the ventilation path 17, and is blown out from the first air outlet 113 and the second air outlet 112. .

  FIG. 3 is an explanatory view schematically showing connections between the motor drive device 2 of the air purifier 1, the power supply system, and the motor 16. The constant voltage power source 18 converts the AC voltage supplied from the AC power source 19 into a DC voltage having a substantially constant voltage value, and supplies the DC voltage to the motor driving device 2 that drives the motor 16. The motor drive device 2 gives the motor 16 drive pulses generated by switching the DC voltage supplied from the constant voltage power supply 18. As a result, the motor 16 is driven by a driving pulse having a constant peak value.

  FIG. 4 is a block diagram illustrating a configuration example of the motor driving device 2 that drives the motor 16. The motor drive device 2 includes a rotation speed detection unit 21 that detects a rotation speed based on a rotation signal provided from a rotation sensor 161 that detects the rotation of the motor 16, and the rotation speed detected by the rotation speed detection unit 21 and a target value. A rotation speed control unit 22 that updates the rotation speed command value according to the deviation of the rotation speed and supplies the rotation speed command value to the drive signal output unit 23; The drive signal output unit 23 drives the motor 16 to rotate based on the rotation speed command value given from the rotation speed control unit 22.

  The motor drive device 2 also detects the cleanliness of the external air based on the detection results of the dust sensor 31 and the odor sensor 32 for detecting dust and odor in the air, respectively, and outputs the detection result to the rotational speed control unit 22 and A cleanliness detection unit 24 provided to a notification unit 26 described later, and a switch operation detection unit 25 that detects an operation on the operation switch 33 of the operation panel 111 are provided. The detection result of the switch operation detection unit 25 is given to the notification unit 26 that displays an alarm on the display lamp 34 and the speaker 35 arranged on the operation panel 111.

  The motor drive device 2 further includes a control unit 20 composed of a microcomputer that controls the processing of each unit described above. The central part of the control system is the CPU 201. The CPU 201 stores the ROM 202 for storing information such as programs, the RAM 203 for storing temporarily generated information, the timer 204 for measuring various times, and the interfaces of the above-described units. Are connected to each other by bus. The CPU 201 executes processes such as input / output and calculation in accordance with a control program stored in advance in the ROM 202.

  Among information such as programs stored in the ROM 202 of the control unit 20, information that can be stored in a removable recording medium includes, for example, a hard disk drive, an optical disk drive, a flexible disk drive, a silicon disk drive, a cassette medium reader, etc. You may make it read with the drive of. The recording media in this case are, for example, a hard disk, an optical disk (including a CD and a DVD), a flexible disk, a semiconductor memory, and a cassette tape, respectively.

  The motor 16 is a DC motor whose rotational speed changes in accordance with the width of the driven pulse, but other motors capable of controlling the rotational speed may be used. In the present embodiment, the rotation sensor 161 includes a pulse generator that generates a pulse as the rotor of the motor 16 rotates, and is disposed in the motor 16. The rotation speed control unit 22 calculates a deviation of the target rotation speed with respect to the rotation speed given from the rotation speed detection unit 21, and determines a rotation speed command value to be given to the drive signal output unit 23 according to the sign of the calculated deviation. Change to large or small.

Here, the rotation speed control unit 22 gives a pulse signal corresponding to a PWM value command signal obtained by pulse-width-modulating the deviation to the drive signal output unit 23, and the pulse width of the pulse signal is the rotation speed command value. It has the meaning as The drive signal output unit 23 includes an inverter, switches a DC voltage having a constant voltage value based on a pulse signal given from the rotation speed control unit 22, generates a drive pulse having a constant peak value and a constant period, and generates a motor 16. To give.
In this way, feedback control is performed so that the rotational speed detected by the rotational speed detection unit 21 matches the target rotational speed.

  The dust sensor 31 includes a light emitting element and a light receiving element that receives light emitted by the light emitting element, and detects particles such as dust floating in the air based on a change in light received by the light receiving element. The odor sensor 32 is a semiconductor gas sensor that is made of a metal oxide semiconductor and detects an odor component in the air by utilizing a change in resistance of the semiconductor when gas is adsorbed on the surface of the semiconductor. That is, the dust sensor 31 and the odor sensor 32 function as a cleanness detector that detects the cleanliness (or the degree of contamination) of air.

  The operation switch 33 includes a power button for turning on / off the power, an air purification setting button for setting the operation of the air purification function, an ion release button for turning on / off the ion, and a predetermined operation related to an alarm. And a button or switch such as a reset switch 331. The operation of the operation switch 33 is detected by the switch operation detection unit 25 and accepted by the control unit 20. For example, when an operation of the air purification setting button is detected by the switch operation detection unit 25, each time the control unit 20 receives the operation, it relates to air purification such as “air volume automatic”, “air volume weak”, “air volume high”, etc. Switch the operation mode.

  The notification unit 26 displays on the display lamp 34 according to the state or mode according to the operation detected by the switch operation detection unit 25 and the cleanliness of the external air detected by the cleanness detection unit 24. Turn on / off. The indicator lamp 34 is a power indicator lamp that is turned on / off according to the on / off state of the power source according to the operation of the power button, and the air purification that displays the operation mode related to the air purification according to the operation of the air purification setting button. It has lamps such as an operation mode display lamp, an ion emission display lamp which displays an on / off state of ion emission according to the operation of the ion emission button, a dust display lamp and an odor display lamp according to the cleanliness of the external air. .

  The display lamp 34 also has a filter maintenance lamp that displays the cleaning time of the air filter 13. When the operation time accumulated by the control unit 20 is equal to or longer than the time corresponding to the cleaning time of the air filter 13, the notification unit 26 turns on the filter maintenance lamp and outputs a predetermined sound (for example, “ The message “It is time to replace the filter” is output. Thereafter, when the user cleans the air filter 13 and operates the reset switch 331, the filter maintenance lamp is turned off, the sound output from the speaker 35 is stopped, and the operation time accumulated by the control unit 20 is cleared. It is made to do.

  The motor drive device 2 controls the rotation speed of the motor 16 to which the fan 15 is attached based on the detection result from at least one of the dust sensor 31 and the odor sensor 32. Specifically, when the air purification operation is performed in the air volume automatic operation mode, the rotational speed of the motor 16 is switched stepwise in accordance with the detection result from the dust sensor 31 and / or the odor sensor 32. For example, when it is determined from the detection result that the external air is dirty, the motor 16 is rotated at a high speed to increase the amount of blown air, and an operation for positively exerting the air purification function is performed. Further, when it is determined from the detection result that the external air is clean, from the viewpoint of suppressing noise and power consumption, the motor 16 is rotated at a low speed to reduce the amount of blown air and save the air purification function. Then drive. By repeating such operation, indoor air outside the apparatus is purified.

  FIG. 5 is an explanatory diagram schematically showing drive pulses that the drive signal output unit 23 gives to the motor 16. As described above, the drive pulse of the motor 16 has the same pulse width as that of the PWM value command signal having a meaning as the rotation speed command value, and has a constant peak value and cycle (Ts). It is. In the present embodiment, the pulse width (ta) as the rotational speed command value at the time of startup is set to the rotational speed during steady operation in order to prevent overshoot in the rotational speed in the feedback control at the time of startup. It is controlled so as not to be larger than the pulse width (tb) as the numerical command value.

  FIG. 6 is a chart showing the correspondence between the air volume in each operation mode related to air purification and the rotational speed command value stored in the ROM 202 or RAM 203. The pulse width (ta) as the rotational speed command value at startup is stored in the ROM 202 as initial values Tli, Tmi, and Thi (Tli <Tmi <Thi) corresponding to weak, medium, and strong airflows, respectively. is there. As will be described later, the rotation speed command values updated for the next activation for each air volume are stored in the RAM 203 as tli, tmi, and thi, respectively. When the rotation speed command value at the time of activation is initialized, Tli, Tmi, and Thi are substituted for tli, tmi, and thi, respectively.

The pulse width as the rotational speed command value that the rotational speed control unit 22 actually gives to the drive signal output unit 23 is stored in the RAM 203 as a common tx for each air volume. Further, reference rotational speed command values for rotating the motor 16 at target rotational speeds corresponding to the weak, medium, and strong airflows are stored in the ROM 202 as Tlr, Tmr, and Thr, respectively.
In the case where Tlr, Tmr, and Thr are adjusted to optimum values according to the individual air purification devices 1, they may be stored in the RAM 203, respectively.

Each time the operation of the air purification device 1 is started, the rotation speed command values (tli, tmi, and thi) are assigned to the rotation speed command values (tx) corresponding to the respective air volumes, and the motor 16 is kept constant. Time driven. Thereby, the motor 16 starts to rotate at an acceleration corresponding to the air volume in the set operation mode. Thereafter, the rotational speed command value (tx) is sequentially updated by feedback control.
Further, the rotational speed command values (tli, tmi, and thi) at the start-up according to the deviation between the rotational speed command value (tx) and the reference rotational speed command value (Tlr, Tmr, and Thr) corresponding to each air volume. ) Have been updated, and will be applied at the next startup.

  FIG. 7 is an explanatory diagram schematically showing how the rotational speed command value is controlled. In the figure, the horizontal axis represents time (s), and the vertical axis represents the pulse width (μs) as the rotational speed command value. The rotation speed command value given to the drive signal output section 23 by the rotation speed control unit 22 is updated every 0.5 seconds. When the rotation speed command value at the start is set as the rotation speed command value, Hold for 5 seconds. When the rotational speed command value is updated, an increment corresponding to the deviation of the target rotational speed with respect to the detected rotational speed is added to the rotational speed command value. Even when the operation mode related to air purification is changed, the rotational speed command value is updated every 0.5 seconds.

  FIG. 8 is a chart showing the correspondence between the air volume in each operation mode related to air purification and the target rotational speed. In FIG. 8, the target rotational speeds corresponding to the weak, medium, and strong airflows are fixed values represented by Rl, Rm, and Rh (Rl <Rm <Rh, the unit is rpm), respectively, and these are the ROM 202. Is remembered.

  FIG. 9 is a chart showing the relationship between the deviation of the target rotational speed with respect to the detected rotational speed and the increment with respect to the rotational speed command value for each air volume. In FIG. 9, the deviation (in rpm) of the target rotational speed with respect to the detected rotational speed is divided into nine stages on the plus (+) and minus (−) sides, and is set for each deviation stage. The increment relative to the rotational speed command value is shown in μs in accordance with the air volume (weak, medium, and strong) in the operation mode. The upper half (or lower half) of the chart shows a case where the target rotational speed is larger (or smaller) than the detected rotational speed. These increments are stored in the ROM 202 as fixed values.

  Returning to FIG. 7, for example, when the operation mode related to air purification is set to “strong” at time T <b> 1 and the operation is started, the rotation speed control unit 22 sets the rotation speed command value (thi) at startup. The value is read from the RAM 203, set to the rotation speed command value (tx), and continuously supplied to the drive signal output unit 23 for 1.5 seconds. In this case, since the rotational speed command value at the time of start-up does not become larger than the rotational speed command value for rotating the motor 16 at the target rotational speed (Rh), it overshoots the rotational speed of the motor 16. Will not occur.

  Thereafter, when the rotational speed command value (tx) is updated at time T2, the rotational speed control unit 22 calculates a deviation of the target rotational speed (Rh) from the rotational speed detected by the rotational speed detection unit 21. In the case of FIG. 7, the deviation is “400”, and FIG. 9 indicates that the increment when the operation mode is “strong” is “+2.5”. “2.5” is added to the rotational speed command value (tx). Similarly, at time “T2 + 0.5 seconds” and time “T2 + 1 seconds”, the rotation speed control unit 22 adds “1.5” to the rotation speed command value (tx) at that time. In this way, control is performed to increase or decrease the rotational speed command value (tx) in accordance with the sign of the deviation until the deviation falls within a predetermined range (± 10 in the present embodiment).

  Next, when the operation mode related to air purification is switched to “weak” at time T <b> 3, the rotational speed control unit 22 determines the deviation of the target rotational speed (Rl) from the rotational speed detected by the rotational speed detection unit 21. calculate. In this case, since the deviation is “−300” and FIG. 9 indicates that the increment when the operation mode is “weak” is “−1”, the rotation speed control unit 22 performs the rotation at that time. “−1” is added to the numerical command value (tx). Similarly, at time “T3 + 0.5 seconds” and time “T3 + 1 seconds”, the rotation speed control unit 22 adds “−1” to the rotation speed command value (tx) at that time.

  Although not shown in FIG. 7, for example, when the operation is stopped at an air volume “weak”, when the above-described deviation is within “± 10”, the rotation speed command value (Tlr) with respect to the reference rotation speed command value (Tlr) The rotational speed command value (tli) at startup is increased or decreased according to the sign of the deviation of (tx). The same applies to other air volumes.

Below, operation | movement of the air cleaner 1 of the structure mentioned above is demonstrated using the flowchart which shows it.
10 to 12 are flowcharts showing the processing procedure of the CPU 201 for driving the motor 16, and FIG. 13 is a flowchart showing the processing procedure of the CPU 201 related to the filter alarm cancellation subroutine. 10 to 13 are executed according to a control program stored in advance in the ROM 202. 10 to 12 are executed when the air purifier 1 is ready to start operation.

In the following description, the initial value of the rotational speed command value at startup, the updated value of the rotational speed command value at startup, and the reference rotational speed command value are referred to as the initial command value, the update command value, and the reference command value, respectively. Also, it is assumed that the air volume at the time of activation is set to one of weak, medium, and strong. For example, when the air volume is strong, the initial command value, the reference command value, and the target rotation speed are stored as Thi, Thr, and Rh, respectively, and the update command value and the rotation speed command value are set as thi and tx, respectively. Remembered. The same applies to other air volumes. Further, it is assumed that the accumulated time and the command value (tmp) are stored in the RAM 203, respectively.
It is assumed that the rotational speed command value is set in the rotational speed control unit 22 at the same time as writing to the RAM 203 and is given to the drive signal output unit 23.

  When the execution of the processing of FIG. 10 is started, the CPU 201 determines whether or not the switch operation detection unit 25 detects that the reset switch 331 is turned on (step S11). When it is determined that it has been detected (step S11: YES), the CPU 201 calls and executes a subroutine relating to the filter alarm cancellation described later (step S12). Thereby, the integration time described later is cleared. Since the accumulated time needs to be cleared once in this way, it is assumed that the reset switch is always turned on before shipment from the factory.

  When the process of step S12 is completed, or when it is determined in step S11 that the reset switch 331 is not turned on (step S11: NO), the CPU 201 detects whether the operation for starting the operation is detected by the switch operation detection unit 25. It is determined whether or not (step S13). When it determines with not having been detected (step S13: NO), CPU201 returns a process to step S11.

  If it is determined that an operation for starting operation has been detected (step S13: YES), the CPU 201 starts measuring the timer T1 included in the timer 204 in order to integrate the operation time of the motor 16 (step S14). The CPU 201 further substitutes the update command value (tli, tmi, thi corresponding to each of the weak, medium, and strong air volumes respectively) in the rotation speed command value (tx) (step S15), and the rotation speed command value. In order to hold a predetermined time, the timer T2 of the timer 204 starts counting (step S16). Thereafter, the CPU 201 determines whether or not 1.5 seconds have elapsed from the start of the time measurement by the timer T2 (step S17), and determines that 1.5 seconds have not elapsed (step S17: NO), 1.5. Wait for seconds to elapse.

  When it is determined that 1.5 seconds have elapsed since the time measurement by the timer T2 is started (step S17: YES), the CPU 201 reads the rotational speed of the motor 16 detected by the rotational speed detection unit 21 (step S18). The deviation of the target rotational speed (Rl, Rm, Rh) with respect to the detected rotational speed is calculated (step S19). Next, the CPU 201 determines whether or not the calculated deviation is within ± 10 rpm (step S20). If it is determined that the deviation does not fall within the range (step S20: NO), the rotational speed command value (tx) shown in FIG. ) Is read (step S21).

Thereafter, the CPU 201 adds the read increment to the rotation speed command value (tx) (step S22), and starts measuring the timer T2 to detect the next sampling timing (step S23). Then, the CPU 201 determines whether or not 0.5 seconds have elapsed since the start of the time measurement by the timer T2 (step S24), and determines that 0.5 seconds has not elapsed (step S24: NO), 0.5 Wait for seconds to elapse. When it determines with 0.5 second having passed (step S24: YES), CPU201 returns a process to step S18.
As described above, by repeating the processing from step S18 to step S24, the rotational speed of the motor 16 substantially matches the target rotational speed (Rl, Rm, Rh).

  When it is determined in step S20 that the deviation is within ± 10 rpm (step S20: YES), the CPU 201 calculates the deviation of the rotational speed command value (tx) from the reference command value (Tlr, Tmr, Thr) (step S31). ), It is determined whether or not the calculated deviation is positive (step S32). When it is determined that the deviation is positive (step S32: YES), the CPU 201 assigns the addition value of the latest update command value (tli, tmi, thi) and the predetermined value: α to the command value (tmp) ( Step S33). The predetermined value α in this case may be, for example, the deviation itself, or a table value determined according to the deviation may be read out.

  When it is determined that the deviation is not positive (step S32: NO), the CPU 201 determines whether or not the deviation is negative (step S34). When it is determined that the deviation is negative (step S34: YES), the CPU 201 assigns a value obtained by subtracting a predetermined value: α from the latest update command value (tli, tmi, thi) to the command value (tmp). (Step S35). In this case, for example, it can be considered that dust or the like is attached to the air filter 13 and the load on the motor 16 is reduced. When it is determined that the deviation is neither positive nor negative (step S34: NO), or when the processes of steps S33 and S35 are completed, the CPU 201 reads the time measured from the timer T1 (step S36) and the accumulated time. Is read (step S37), and the sum of the read times is calculated (step S38).

  Thereafter, the CPU 201 determines whether or not the calculated sum of times has reached the maintenance time of the filter 13 (step S41). When it is determined that the maintenance time has been reached (step S41: YES), the CPU 201 causes the notification unit 26 to turn on the filter maintenance lamp of the display lamp 34 (step S42), and causes the speaker 35 to output an alarm sound ( Step S43) The process is returned to Step S23. When it is determined that the maintenance time has not been reached (step S41: NO), the CPU 201 determines whether or not an operation for ending the operation is detected by the switch operation detection unit 25 (step S44).

  When it is determined that an operation for ending the operation is detected (step S44: YES), the CPU 201 writes the sum of the times calculated in step S38 into the accumulated time (step S45). Then, the CPU 201 assigns the command value (tmp) to the update command value (tli, tmi, thi) (step S46) and ends the process. When it is determined that the operation for ending the operation has not been detected (step S44: NO), the CPU 201 determines whether or not the switch operation detection unit 25 has detected that the reset switch 331 is turned on (step S47).

  When it is determined that the reset switch 331 has been turned on (step S47: YES), the CPU 201 calls and executes a subroutine relating to the filter alarm cancellation (step S48), and starts counting by the timer T1 (step S49). The process returns to step S23. When it is determined that the reset switch 331 is not turned on (step S47: NO), the CPU 201 returns the process to step S23.

  When the processing of the subroutine shown in FIG. 13 is called, the CPU 201 causes the notification unit 26 to turn off the filter maintenance lamp of the display lamp 34 (step S51) and stop the alarm sound from the speaker 35 (step S52). . Thereafter, the CPU 201 assigns the initial command value (Tli, Tmi, Thi) to the update command value (tli, tmi, thi) (step S53), clears the accumulated time (step S54), and returns to the called process. To do.

  As described above, according to the present embodiment, the rotational speed command value (tli, tmi, thi) at the start according to the target rotational speed (Rl, Rm, Rh) of the motor and the target rotational speed of the motor. And storing the reference command values (Tlr, Tmr, Thr) for rotating the motor, and detecting the rotation speed of the motor to be started based on the stored rotation speed command value at the rotation speed detection unit, The motor rotational speed command value (tx) is updated with an increment corresponding to the deviation of the target rotational speed with respect to the detected rotational speed, and the updated rotational speed command value with respect to the stored reference command values (Tlr, Tmr, Thr) The command value (tmp) is increased or decreased according to the sign of the deviation of (tx).

Thereby, when the rotational speed command value (tx) that is sequentially updated is larger (or smaller) than the reference command value (Tlr, Tmr, Thr), the command value (tmp) is the latest update command value (tli, tmi, It is updated so as to increase (or decrease) from thi), and the command value (tmp) is written to the update command value (tli, tmi, thi) at the end of operation.
For this reason, whenever the rotation speed command value (tx) given to the motor is updated, the command value (tmp) can be corrected and converged to an appropriate value. In this case, since the rotational speed command value (tx) that is sequentially updated decreases gradually until the motor reaches steady operation and converges to a constant value, the update command value (tli, tmi, thi) can be set to a small value that does not cause an overshoot in the rotational speed in the feedback control of the motor. This value may be smaller than the reference command value (Tlr, Tmr, Thr).
Further, for example, even when the motor load increases (or decreases) while the motor is repeatedly started and stopped, the update command value (tli, tmi, thi) is appropriately increased (or decreased). be able to.

  Therefore, the target rotational speed can be reached quickly and smoothly without overshooting the target rotational speed when the motor is started.

Further, according to the present embodiment, when the accumulated time during which the motor is driven to rotate reaches the maintenance time of the air filter, the filter maintenance lamp is turned on and the alarm sound is output from the speaker to issue an alarm. On the other hand, when the operation of the reset switch is detected and accepted, the accumulated time is cleared and initialized, and the initial command value (Tli, Tmi, Thi) is substituted into the update command value (tli, tmi, thi). .
Therefore, an alarm can be output when the maintenance time is required for a factor that fluctuates the rotation speed of the motor, and when the factor is eliminated, an operation of the reset switch by the user is accepted and an update command value (tli , Tmi, thi) can be returned to a predetermined initial value.

Furthermore, according to the present embodiment, the motor drive device of the air cleaner drives the motor that rotates the fan, and the air filter purifies the air sucked by the rotation of the fan and blows it out.
Therefore, a motor drive device that can reach the target rotational speed quickly and smoothly without overshooting the target rotational speed when the motor is started is applied to the air cleaner.

  In the present embodiment, the pulse width of the pulse signal given to the drive signal output unit 23 has a meaning as a rotation speed command value, and the pulse width is stored as the rotation speed command value. For example, the duty ratio of the pulse signal given to the drive signal output unit 23 has a meaning as a rotational speed command value, and the duty ratio is stored as the rotational speed command value. Good.

  Further, the update command value (tli, tmi, thi) is applied to the rotational speed command value (tx) only at the start of operation, but is not limited to this, and at the time of switching the air volume, An update command value (tli, tmi, thi) corresponding to the air volume to be switched may be applied to the rotation speed command value (tx).

  Furthermore, the rotational speed command value (tx) is held for 1.5 seconds at the time of start-up, but is not limited to this. For example, the rotational speed command value (tx) is continuously maintained until the deviation from the target rotational speed is within a predetermined range. The feedback control may be started thereafter.

  Furthermore, although the motor drive device is applied to an air purifier, it may be applied to other air conditioners such as an ion generator, an air conditioner, a humidifier, and a dehumidifier.

DESCRIPTION OF SYMBOLS 1 Air cleaner 2 Motor drive device 13 Air filter 15 Fan (a part of air blower)
16 motor 161 rotation sensor 20 control unit 201 CPU
202 ROM
203 RAM (means for storing a reference rotational speed command value)
204 timer (means for accumulating time during which the motor is driven to rotate)
DESCRIPTION OF SYMBOLS 21 Rotation speed detection part 22 Rotation speed control part 23 Drive signal output part 25 Switch operation detection part 26 Notification part 33 Operation switch 331 Reset switch (means which receive predetermined | prescribed operation)
34 Indicator lamp (means for notifying a predetermined warning)
35 Speaker (Means for notifying a predetermined warning)

Claims (5)

The rotational speed command value at the start of the motor to be driven based on the rotational speed command value is stored according to the target rotational speed, and the motor to be started based on the stored rotational speed command value is stored. In a motor driving method for detecting the number of rotations and driving the motor to rotate based on the detected number of rotations and a rotation number command value updated according to the deviation of the target number of rotations,
A reference rotation speed command value for rotating the motor at the target rotation speed is stored,
A motor drive method comprising: updating the rotation speed command value at the start-up according to a stored difference between the reference rotation speed command value and the updated rotation speed command value. Accumulate the time to rotate the motor,
Determine whether the integrated value is greater than or equal to a predetermined time,
If it is determined that it is above, a predetermined warning is notified,
Accepts certain operations,
If accepted, initialize the integrated value,
The motor driving method according to claim 1, wherein, when initialized, the rotation speed command value at the time of starting is set to a predetermined value. The rotational speed command value at the start of the motor to be driven based on the rotational speed command value is stored according to the target rotational speed, and the motor to be started based on the stored rotational speed command value is stored. In the motor drive device that detects the number of revolutions and should drive the motor based on the number of revolutions command value updated according to the detected number of revolutions and the deviation of the target number of revolutions,
Means for storing a reference rotational speed command value for rotating the motor at the target rotational speed;
The motor drive device according to claim 1, wherein the rotation speed command value at the start-up is updated in accordance with a deviation between the reference rotation speed command value stored by the means and the updated rotation speed command value. Means for integrating the time during which the motor is driven to rotate;
Means for determining whether the integrated value of the means is equal to or longer than a predetermined time;
Means for notifying a predetermined warning when it is determined that the means is above;
Means for receiving a predetermined operation;
If the means accepts, means for initializing the integrated value;
4. The motor drive device according to claim 3, further comprising: means for setting the rotation speed command value at the start-up to a predetermined value when the means is initialized. The motor driving device according to claim 3 or 4,
A blower having a motor rotationally driven by the motor drive device;
An air conditioner comprising: an air filter that purifies air that is sucked and blown out by the blower.

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