JP3292818B2 - Fan motor and electric equipment using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fan motor equipped with a DC motor used for a ventilation hood such as a range hood or a ceiling-mounted type.

[0002]

2. Description of the Related Art In recent years, there has been a demand for a fan motor with good controllability to be mounted on a range hood or a ceiling-mounted type ventilation fan capable of ventilating at an optimum air volume according to a cooking state or a living room situation. I have.

Conventionally, this type of fan motor is shown in FIG.
This will be described with reference to FIGS. As shown in the figure,
The fan motor 101 which is a centrifugal blower is a DC motor 1
02, and its outlet 103 is connected to a duct 104. The duct 104 allows indoor air contaminated by tobacco smoke sucked by the fan motor 101 and oil smoke and waste gas generated by cooking to pass through a wall 105 of the building. Leading outside. The rotation of the DC motor 102 is controlled by energization control means 106 for controlling the energization of the stator windings according to the rotor position, and the number of rotations detecting means 107 detects the number of rotations of the DC motor 102 based on the control state. The specified number of rotations at each applied voltage to the DC motor 102 for realizing the strong, medium, and weak operating airflows instructed by the airflow amount instructing unit 108 for instructing the operating airflow of the motor 101 is stored in the specified rotation number storage unit 10.
9 memorizes. Further, the voltage control means 110 determines the air volume indicated by the air volume instructing means 108 and the current DC motor 10
After the rotation speed for operating the fan motor 101 at the instructed air volume is selected from the specified rotation speed storage means 109 based on the applied voltage to the motor 2, the selected specified rotation speed and the current speed detected by the rotation speed detection means 107 are detected. The voltage control unit 110 repeatedly controls the voltage applied to the DC motor 102 so that the operation speed is compared with the operation speed and becomes equal to the selected specified speed. For example, when the operating rotation speed is higher than the specified rotation speed, it is determined that the air volume is small, and the voltage applied to the DC motor 102 is increased. In addition, when the operating rotation speed is smaller than the specified rotation speed, it is determined that the air volume is large, and the voltage applied to the DC motor 102 is controlled to be reduced. Also, as shown in FIG.
The rotation speed detecting means 107, the voltage control means 110, and the specified rotation speed storage means 109 are formed by a microcomputer 111, a switching power supply 111a and peripheral circuits, and the energization control means 106 is constituted by a switching element 111b.

[0004]

In such a conventional fan motor, the required air flow differs depending on the size of the living room, the number of personnel, and the like, so that a large number of set air flows are required. Also, since it is necessary to increase the resolution of the voltage applied to the DC motor 102 in order to increase the air volume accuracy, the microcomputer 1
11 has a problem that a large amount of ROM capacity is required. Further, there is a problem that increasing the ROM capacity increases the cost. Further, when the ROM capacity is reduced for cost reduction, there is a problem that the set air volume is reduced or the air volume accuracy is deteriorated. On the other hand, there is also proposed a method of calculating the specified rotation speed by a function formula using multiplication / division or the like from the applied voltage instead of storing the specified rotation speed with respect to the applied voltage.
1 was limited, leading to an increase in cost.

The present invention solves the above-mentioned problems. Even if an inexpensive microcomputer having a small ROM capacity and not having a multiplication / division calculation function is used, it is possible to increase the set air volume and prevent deterioration of air volume accuracy. An object of the present invention is to provide a fan motor that can be used and an electric device using the same.

[0006]

In order to achieve the above object, a fan motor according to the present invention comprises a DC motor, an energization control means for controlling energization of the DC motor, and an energization control means. Rotation speed detection means for detecting the operation rotation speed of the DC motor from operation, prescribed rotation speed storage means for storing the rotation speed at each applied voltage of the DC motor for operating at the reference air flow rate, and instructing the operation air flow rate Air flow instructing means, and a specified rotation speed correcting means for correcting a specified rotation speed selected from the specified rotation speed storage device based on a difference between the air flow indicated by the air flow indication device and the reference air flow. Voltage control means for controlling an applied voltage to the DC motor so that the operation speed detected by the detection means becomes the same as the specified speed corrected by the specified speed correction means. It was to become of the fan motor configuration.

In order to achieve the above object, the second means divides the applied voltage to the DC motor into predetermined blocks, and the applied voltage for changing the correction value to be corrected by the specified rotation speed correcting means by the block. The fan motor has a block determination unit.

In order to achieve the above object, the third means is that the correction value to be corrected by the prescribed rotation speed correction means is a correction value calculation means which is determined by a function formula calculated from a voltage applied to the DC motor. The configuration of the fan motor characterized by comprising:

In order to achieve the above object, a fourth means is a DC motor, an energization control means for controlling energization of the DC motor, and an operation speed of the DC motor based on the operation of the energization control means. Means for detecting the number of rotations, means for storing the number of rotations of the DC motor at each applied voltage for operating at the reference air volume, storage means for storing the number of rotations, air volume instructing means for instructing the operating air volume, and air volume instructing means A specified rotation speed search means for shifting and selecting an address corresponding to the applied voltage searched from the specified rotation speed storage means from a difference between the air flow amount designated by the reference airflow amount and the reference air flow amount, and detecting the rotation speed by the rotation speed detection means. Voltage control means for controlling the voltage applied to the DC motor so that the specified operation speed becomes the same as the specified speed selected by the specified speed search means. It has a configuration of Anmota.

In order to achieve the above object, a fifth means divides an applied voltage to the DC motor into predetermined blocks, and shifts an address corresponding to the applied voltage by the specified rotation speed searching means by the block. And a shift amount selecting means for changing a shift amount to be shifted.

In order to achieve the above object, a sixth means is that the shift amount for shifting the address corresponding to the applied voltage by the prescribed rotation speed searching means is a function formula calculated from the applied voltage to the DC motor. And a shift amount calculating means for determining the shift amount.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention provides a DC motor, energization control means for controlling energization of the DC motor, and an operation speed of the DC motor based on the operation of the energization control means. Rotation speed detecting means for detecting
A specified rotation speed storage means for storing the rotation speed at each applied voltage of the DC motor for operating at the reference air flow rate, an air flow rate instruction means for instructing the operation air flow rate, and the air flow rate and the reference air flow rate indicated by the air flow rate instruction means; And a specified rotation speed correction means for correcting the specified rotation speed selected from the specified rotation speed storage device from the difference, and the operating rotation speed detected by the rotation speed detection device is corrected by the specified rotation speed correction device. And a voltage control means for controlling the voltage applied to the DC motor so that the rotation speed becomes the same as the specified rotation speed. The fan motor has a function of suppressing the used capacity of the ROM. .

Further, the invention according to claim 2 is characterized in that the DC
The voltage applied to the motor is divided into predetermined blocks, and the block is provided with an applied voltage block determining means for changing a correction value corrected by the specified rotation speed correcting means according to the block. This has the effect of suppressing the used capacity and maintaining the air volume accuracy.

According to a third aspect of the present invention, there is provided a correction value calculating means for determining a correction value to be corrected by the prescribed rotation speed correcting means by a function formula calculated from a voltage applied to the DC motor. This has the effect of suppressing the used capacity of the ROM and maintaining the air volume accuracy.

According to a fourth aspect of the present invention, there is provided a DC motor, energization control means for controlling energization of the DC motor, and a rotation speed detecting means for detecting an operation speed of the DC motor from the operation of the energization control means. Means, a prescribed number of revolutions storage means for storing the number of revolutions of the DC motor at each applied voltage for operating at a reference air volume, an air volume instruction device for instructing an operation air volume, and an air volume designated by the air volume instruction device. A predetermined rotation speed search means for shifting and selecting an address corresponding to the applied voltage searched from the predetermined rotation speed storage means from the difference between the reference rotation speed and the reference air flow rate, and an operating rotation speed detected by the rotation speed detection means. The structure of a fan motor provided with voltage control means for controlling the applied voltage to the DC motor so that the rotation speed becomes the same as the specified rotation speed selected by the specified rotation speed search means. Is obtained by a, it has an effect of suppressing the used capacity of the ROM.

The invention according to claim 5 is characterized in that the DC
The voltage applied to the motor is divided into predetermined blocks, and the block is provided with shift amount selecting means for changing a shift amount for shifting an address corresponding to the applied voltage by the specified rotation speed searching means. This has the effect of suppressing the used capacity of the ROM and maintaining the air volume accuracy.

According to a sixth aspect of the present invention, the shift amount for shifting the address corresponding to the applied voltage by the prescribed rotation speed search means is determined by a function formula calculated from the applied voltage to the DC motor. This is characterized in that it is provided with an amount calculating means, and has the effect of suppressing the used capacity of the ROM and maintaining the air volume accuracy.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0019]

【Example】

(Embodiment 1) As shown in FIGS. 1 to 6, reference numeral 1 denotes a fan motor used for a ventilation fan 1a such as a range hood or a ceiling-mounted type. The fan motor 1 has a DC motor 2 mounted thereon and a discharge port thereof. Numeral 3 is connected to a duct 4, and the duct 4 is provided to guide indoor air contaminated by tobacco smoke sucked by the fan motor 1 or oil smoke and waste gas generated by cooking through a building wall 5 to the outside. Have been.
The rotation of the DC motor 2 is controlled by energization control means 6 for controlling energization to the stator windings 13 according to the position of the rotor 12, and the rotational speed detecting means 7 detects the operating rotational speed of the DC motor 2 according to the control state. The specified rotation number storage means 9 stores the required rotation number at each applied voltage to the DC motor 2 for realizing the reference air volume. Further, the air volume indicating means 8 is set at an interval of ± 15% with respect to the reference air volume, and the voltage control means 10 stores the specified number of revolutions at the current applied voltage for operating the fan motor 1 at the reference air volume. After the selection by the means 9, the specified rotation speed is corrected by the specified rotation speed correction means 11 based on the difference between the reference airflow and the airflow indicated by the airflow indication means 8, and then detected by the rotation speed detection means 7. The operation rotation speed is compared with the corrected specified rotation speed, and the changed applied voltage difference storage means 14 is compared.
, A change applied voltage difference in the rotation speed difference is selected, and a voltage applied to the DC motor 2 is determined next.

In the above configuration, the fan motor 1 is operated in advance, and the applied voltage to the DC motor 2 is continuously changed as shown in FIG.
, Vn + 1, Vn, V
,..., Nsmax,..., Nsn + 1, Ns
n, Nsn-1,..., Nsmin are measured and, as shown in FIG. 3, the number of revolutions for each applied voltage is stored in the prescribed number of revolutions storage means 9 as the number of revolutions required for operation at the reference airflow. . At the same time, the number of revolutions at an air volume of ± 15% interval from the reference air volume is also measured, and the average value of the difference from the number of revolutions at the same applied voltage and the reference air volume is corrected,..., N70, N85, N115, N
130,…. As shown in FIG. 4, the rotation speed detecting means 7, the voltage control means 10, the specified rotation speed storage means 9, the change applied voltage difference storage means 14 and the specified rotation speed correction means 11 include a microcomputer 15, a switching power supply 15a, The energization control means 6 is formed of a peripheral circuit and includes a switching element 15b. The power supply control means 6 controls the power supply from the switching power supply 15a to the stator winding 13 of the DC motor 2 by a gate signal of the microcomputer 15. Then, when the fan motor 1 is actually installed and the power is turned on, the operation is started according to the procedure of the program shown in the flowchart of FIG.
First, an initial voltage is applied to the DC motor 2 by the voltage control means 10 via the power supply control means 6 to start the operation. Then, the power supply control means 6 controls the rotor 12 of the DC motor 2.
The energization of the stator winding 13 is switched according to the position,
The DC motor 2 rotates at a rotation speed corresponding to the duct loss in the air path. At this time, the rotation speed detecting means 7 detects the operating rotation speed from the switching speed of the power supply to the stator winding 13 of the power supply control means 6. Next, when the operating air flow is instructed by the air flow instructing means 8, the voltage control means 10 searches the specified rotation speed storage means 9 for the specified applied air flow at the current applied voltage from the specified rotation speed storage means 9 to obtain the reference air flow. From the difference between the specified airflow and the reference airflow, the specified rotation speed is corrected to the low rotation side if the indicated airflow is larger than the reference airflow, and conversely to the high rotation side if the indicated airflow is smaller than the reference airflow. For example, if the indicated airflow is 15% less than the reference airflow, N
Add 85 and if 70% less add N70 as well. Conversely, if it is 15% higher, N115 is subtracted from the selected rotation speed, and if it is 30% higher, the value obtained by subtracting N130 is defined as the specified rotation speed. The change application voltage difference in the rotation speed difference is selected from the difference storage means 14, the target voltage to be applied to the DC motor 2 is determined next, and the target voltage is applied to the DC motor 2. However, even if a microcomputer having a small ROM capacity is used, a large number of designated airflows can be set.

In the first embodiment, the designated airflow is set at an interval of ± 15% with respect to the reference airflow. However, the value may be determined from the specification of a product on which the fan motor 1 is mounted.

(Embodiment 2) The same parts as those in Embodiment 1 are denoted by the same reference numerals, and detailed description thereof will be omitted.

As shown in FIGS. 7 to 9, reference numeral 16 denotes an applied voltage block judging means, which applies an applied voltage Vn to the DC motor 2 to Vmin ≦ Vn ≦ 13 [V] in blocks 1 and 13 <Vn ≦
25 [V] is a block 2 and 25 <Vn ≦ Vmax [V] is a block 3. When the voltage applied to the DC motor 2 is the block 1, the block 2, the block 3, and the correction value are changed. The other configuration is the same as that of the first embodiment.

In the above configuration, the voltage control unit 10 searches the specified rotation speed storage unit 9 for the specified rotation speed required for operating at the reference airflow at the current applied voltage,
The signal is transmitted to the applied voltage block determining means 16.
Here, the applied voltage block determining means 16 determines N115b1 when the applied voltage is block 1 and the indicated airflow is 15% larger than the reference airflow, and N115b2 when the applied voltage is 15% larger than the reference airflow in block 2. In block 3, when the indicated airflow is 15% larger than the reference airflow, the rotation speed obtained by subtracting N115b3 from the selected specified rotation speed is switched to the specified rotation speed, and control is performed. If the airflow is 15% less than the reference airflow, N85b1 is used in Block 2. If the indicated airflow is 15% less than the reference airflow, N85b2 is used. In Block 3, the airflow is 1% lower than the reference airflow.
If it is less than 5%, N85b3 is switched to the specified number of rotations in addition to the specified number of rotations to control the number of rotations. Similarly, if the indicated airflow is 30% larger than the reference airflow, N130bk (k =
1, 2, 3) is reduced by N70bk (k = 1,
2, 3) is corrected, the corrected specified rotational speed is compared with the operating rotational speed, the changed applied voltage difference at the difference in the rotational speed is selected from the changed applied voltage difference storage means 14, and D
By determining and controlling the target voltage to be applied to the C motor 2, even if a microcomputer having a small ROM capacity and having no multiplication / division calculation function is used, a large number of indicated airflows can be set and the airflow accuracy deteriorates. Can be prevented.

In the second embodiment, the indicated airflow is set at an interval of ± 15% with respect to the reference airflow. However, the value may be determined from the specification of a product on which the fan motor 1 is mounted. Although the applied voltage block is set to three blocks, the air volume accuracy increases as the number of blocks increases, and the air volume accuracy decreases as the number of blocks decreases, and the number of blocks increases in accordance with the air volume accuracy required from the application of the fan motor 1. May be increased or decreased.

(Embodiment 3) The same parts as those in Embodiment 1 are denoted by the same reference numerals, and detailed description thereof will be omitted.

As shown in FIGS. 10 and 11, reference numeral 17 denotes a correction amount calculating means which calculates the rotation speed for correcting the specified rotation speed based on the voltage applied to the DC motor 2 and the difference between the reference airflow and the commanded airflow by linear regression. The configuration is obtained by approximation, and the other configuration is the same as that of the first embodiment.

In the above configuration, the voltage control unit 10 searches the specified rotation speed storage unit 9 for the specified rotation speed necessary for operating at the reference airflow at the current applied voltage,
The signal is transmitted to the correction amount calculating means 17. Here, the correction amount calculating means 17 calculates the rotation speed correction amount by linear regression from the applied voltage and the difference between the reference air flow and the indicated air flow, and corrects the value by adding or subtracting the value to the selected specified rotation speed. Is switched to the specified rotation speed. Next, the voltage control unit 10 compares the corrected specified rotation speed with the operating rotation speed, selects a changed applied voltage difference at the rotation speed difference from the changed applied voltage difference storage unit 14, and
By determining and controlling the target voltage to be applied to the motor 2, even if a microcomputer having a small ROM capacity and not having a multiplication / division calculation function can be used, a large number of indicated airflows can be set, and the airflow accuracy deteriorates. It can be prevented.

(Embodiment 4) The same parts as those in Embodiment 1 are denoted by the same reference numerals, and detailed description thereof will be omitted.

As shown in FIGS. 12 to 15, reference numeral 18 denotes a specified rotation speed search means. When the designated airflow is larger than the reference airflow, an address corresponding to the applied voltage selected from the specified rotation speed storage means 9 is set to a low voltage. The predetermined address is shifted toward the high-voltage side, and when the indicated airflow is smaller than the reference airflow, the predetermined address is shifted to the high-voltage side for selection. The other configuration is the same as that of the first embodiment.

In the above configuration, the fan motor 1 is operated in advance, and the applied voltage to the DC motor 2 is continuously changed as shown in FIG. 13 so that each of the applied voltages Vmax,... , Vn + 1, Vn,
Vn-1,..., Vmin, rotation speed Nsmax,.
sn, Nsn-1,..., Nsmin are measured, and as shown in FIG. 14, the number of revolutions for each applied voltage is stored in the prescribed number of revolutions storage means 9 as the number of revolutions required to operate at the reference airflow. . At the same time, the number of rotations at the air volume of ± 15% interval from the reference air volume is also measured, and the average value of the difference between the addresses corresponding to the applied voltages is set so that the rotation speed of each indicated air volume and the rotation speed at the reference air volume are substantially the same. It is stored as a shift amount. Then, when the fan motor 1 is actually installed and the power is turned on, the operation is started according to the procedure of the program shown in the flowchart of FIG. First, an initial voltage is applied to the DC motor 2 by the voltage control means 10 via the power supply control means 6 to start the operation. Then, the energization control means 6 sets the DC motor 2
The energization to the stator winding 13 is switched according to the position of the rotor 12, and the DC motor 2 rotates at a rotational speed corresponding to the duct loss in the air path. At this time, the rotation speed detecting means 7 detects the operating rotation speed from the switching speed of the power supply to the stator winding 13 of the power supply control means 6. Next, when the operating air volume is instructed by the air volume instructing means 8, the specified rotation speed searching means 18 sets V115 when the instructed air volume is 15% larger than the reference air volume,
If it is larger by 30%, V130 is shifted to a lower voltage side with respect to the current applied voltage, and the specified rotation speed is selected from the specified rotation speed storage means 9. Similarly, the indicated airflow is 15% lower than the reference airflow.
If it is small, V85 is shifted, and if it is 30% less, V70 is shifted to the higher voltage side with respect to the current applied voltage, and the specified rotation speed is selected from the specified rotation speed storage means 9. By comparing the rotation speeds and selecting the changed applied voltage difference at the rotation speed difference from the changed applied voltage difference storage means 14, the target voltage to be applied to the DC motor 2 is determined and controlled, and the multiplication / division is performed. Even if a microcomputer having no arithmetic function and having a small ROM capacity is used, a large number of indicated airflows can be set.

In the fourth embodiment, the indicated airflow is set at an interval of ± 15% with respect to the reference airflow. However, the value may be determined from the specification of a product on which the fan motor 1 is mounted.

(Embodiment 5) The same parts as those in Embodiment 1 are denoted by the same reference numerals, and detailed description thereof will be omitted.

As shown in FIG. 16 and FIG. 17, reference numeral 19 denotes a shift amount selecting means for setting the voltage Vn applied to the DC motor 2 to Vmin.ltoreq.Vn.ltoreq.13 [V] in the block 1, 13 <Vn.ltoreq.
25 [V] is a block 2 and 25 <Vn ≦ Vmax [V] is a block 3. When the applied voltage to the DC motor 2 is the block 1, the block 2, the block 3, and the address corresponding to the applied voltage. The configuration is different from that of the first embodiment in that the shift amount for shifting is changed.

In the above configuration, the shift amount selecting means 19
Is V115b1 when the applied voltage is block 1 and the indicated airflow is 15% larger than the reference airflow, V115b2 when the indicated airflow is 15% larger than the reference airflow, and block 115 when the indicated airflow is 15% larger than the reference airflow. If the airflow is 15% larger than the reference airflow, V115b3 is shifted to the lower voltage side with respect to the address corresponding to the applied voltage, and is selected and controlled from the specified rotation speed storage means 9. V85b1 when the applied voltage is block 1 and the indicated airflow is 15% less than the reference airflow, V85b2 when the applied airflow is 15% less than the reference airflow in Block2,
In block 3, when the indicated air volume is 15% smaller than the reference air volume, V85b3 is shifted to a higher voltage side with respect to the address corresponding to the applied voltage, and is selected from the specified rotation speed storage means 9 and controlled. Similarly, if the indicated airflow is 30% larger than the reference airflow, the address is shifted by V130bk (k = 1, 2, 3), and if the indicated airflow is 30% smaller than the reference airflow, V70bk (k = 1, 2, 3) is shifted to the specified rotation speed. Is selected, the selected specified rotation speed is compared with the operating rotation speed, and the changed applied voltage difference at the rotation speed difference is selected from the changed applied voltage difference storage means 14, and then DC
By determining and controlling the target voltage to be applied to the motor 2, even if a microcomputer having a small ROM capacity and not having a multiplication / division calculation function can be used, a large number of indicated airflows can be set, and the airflow accuracy deteriorates. It can be prevented.

In the fifth embodiment, the indicated airflow is set at an interval of ± 15% with respect to the reference airflow. However, the value may be determined from the specification of a product on which the fan motor 1 is mounted. Although the applied voltage block is set to three blocks, the air volume accuracy increases as the number of blocks increases, and the air volume accuracy decreases as the number of blocks decreases, and the number of blocks increases in accordance with the air volume accuracy required from the application of the fan motor 1. May be increased or decreased.

(Embodiment 6) The same parts as those in Embodiment 1 are denoted by the same reference numerals, and detailed description thereof will be omitted.

As shown in FIGS. 18 and 19, reference numeral 20 denotes a shift amount calculating means for approximating, by linear regression, a shift amount of an address searched from a voltage applied to the DC motor 2 and a difference between a reference air flow and an instruction air flow. The other configurations are the same as those of the first embodiment.

In the above configuration, the shift amount calculating means 20
Is obtained by approximating, by linear regression, the shift amount of the address to be searched from the voltage applied to the DC motor 2 and the difference between the reference airflow and the instruction airflow. If the instruction airflow is larger than the reference airflow,
The shift amount is shifted from the address corresponding to the current applied voltage of the specified rotation speed storage means 9 to the low voltage side to select the specified rotation speed. If the indicated airflow is smaller than the reference airflow, the shift amount is specified. After shifting from the address corresponding to the current applied voltage of the rotation speed storage means 9 to the high voltage side and selecting the specified rotation speed, the selected specified rotation speed is compared with the operating rotation speed,
The change application voltage difference at the rotation speed difference is selected from the change application voltage difference storage means 14, and the DC motor 2
By determining and controlling the target voltage to be applied to the microcomputer, it is possible to set a large number of indicated airflows and prevent deterioration of the airflow accuracy even when using a microcomputer having a small ROM capacity without a multiplication / division calculation function. It becomes.

In this embodiment, the ventilation fan has been described. However, the present invention is naturally applicable to electric appliances such as a range hood, an air conditioner, and an air purifier using the same fan motor. is there.

[0041]

As is apparent from the above embodiment, according to the present invention, even if an inexpensive general-purpose microcomputer having no ROM capacity and having a multiplication / division calculation function is used, the set air volume can be reduced. It is possible to provide a fan motor and an electric device using the fan motor, which can be increased in number and can prevent deterioration of the air volume accuracy.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a fan motor according to a first embodiment of the present invention.

FIG. 2 is a graph showing static pressure, rotation speed and air flow showing the same operation characteristics.

FIG. 3 is a diagram showing a table showing a relationship among a reference air flow, an applied voltage, a rotation speed, and an instruction air flow and a correction amount.

FIG. 4 is a circuit diagram of the main part.

FIG. 5 is a flowchart showing an example of a program for the operation.

FIG. 6 is a schematic view showing a state in which a ventilation fan equipped with the fan motor is installed.

FIG. 7 is a block diagram illustrating a configuration of a fan motor according to a second embodiment of the present invention.

FIG. 8 is a diagram showing a table showing a relationship among a reference air flow, an applied voltage, a rotation speed, an instruction air flow, and a correction amount.

FIG. 9 is a flowchart showing an example of a program for the operation.

FIG. 10 is a block diagram illustrating a configuration of a fan motor according to a third embodiment of the present invention.

FIG. 11 is a flowchart showing an example of a program for the operation.

FIG. 12 is a block diagram illustrating a configuration of a fan motor according to a fourth embodiment of the present invention.

FIG. 13 is a graph showing static pressure, rotation speed and air flow showing the same operation characteristics.

FIG. 14 is a diagram showing a table showing a relationship among the reference air volume, applied voltage, rotation speed, indicated air volume, and address shift amount.

FIG. 15 is a flowchart showing an example of a program for the operation.

FIG. 16 is a block diagram illustrating a configuration of a fan motor according to a fifth embodiment of the present invention.

FIG. 17 is a flowchart showing an example of a program for the operation.

FIG. 18 is a block diagram illustrating a configuration of a fan motor according to a sixth embodiment of the present invention.

FIG. 19 is a flowchart showing an example of a program for the operation.

FIG. 20 is a block diagram showing a configuration of a conventional fan motor.

FIG. 21 is a flowchart showing an example of a program for the operation.

FIG. 22 is a diagram showing a table showing a relationship among the indicated airflow, applied voltage, and rotation speed.

FIG. 23 is a circuit diagram of the main part.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fan motor 1a Ventilation fan 2 DC motor 3 Discharge port 4 Duct 5 Wall 6 Energization control means 7 Revolution number detection means 8 Air volume indication means 9 Specified revolution number storage means 10 Voltage control means 11 Specified revolution number correction means 12 Rotor 13 Stator Winding 14 Change applied voltage difference storage means 15 Microcomputer 15a Switching power supply 15b Switching element 16 Applied voltage block determination means 17 Correction value calculation means 18 Specified rotation speed search means 19 Shift amount selection means 20 Shift amount calculation means

Claims (8)

(57) [Claims] 1. A DC motor, an energization control unit for controlling energization of the DC motor, a rotation speed detection unit for detecting an operation rotation speed of the DC motor from the operation of the energization control unit, and operating at a reference airflow. A specified rotation speed storage means for storing the rotation speed of the DC motor at each applied voltage for
An air flow amount instructing unit that instructs an operation air amount, and a specified rotation speed correction unit that corrects a specified rotation speed selected from the specified rotation speed storage unit based on a difference between the air flow amount and the reference air flow amount specified by the air flow amount instruction unit. Voltage control means for controlling an applied voltage to the DC motor so that the operation speed detected by the speed detection means becomes the same as the specified speed corrected by the specified speed correction means. Become a fan motor. 2. An apparatus according to claim 1, further comprising an applied voltage block determining means for dividing the applied voltage to said DC motor into predetermined blocks, and for changing the correction value corrected by said prescribed rotation speed correcting means according to said blocks. 1. The fan motor according to 1. 3. The apparatus according to claim 1, further comprising a correction value calculating means for determining a correction value to be corrected by said specified rotation speed correcting means by a function formula calculated from a voltage applied to said DC motor. Fan motor. 4. A DC motor, an energization control unit for controlling energization of the DC motor, a rotation speed detection unit for detecting an operation rotation speed of the DC motor from an operation of the energization control unit, and operating at a reference airflow. A specified rotation speed storage means for storing the rotation speed of the DC motor at each applied voltage for
Air flow instructing means for instructing the operating air flow, and a specified rotation for shifting and selecting an address corresponding to the applied voltage searched from the specified rotation speed storage means from a difference between the air flow instructed by the air flow instructing means and the reference air flow. A voltage control means for controlling the voltage applied to the DC motor so that the operating speed detected by the speed detecting means is the same as the specified speed selected by the specified speed searching means. A fan motor provided with control means. 5. A shift amount selecting means for dividing a voltage applied to the DC motor into predetermined blocks, and changing a shift amount for shifting an address corresponding to the applied voltage by the prescribed rotation speed searching means by the block. The fan motor according to claim 4, wherein: 6. A shift amount calculating means for determining a shift amount for shifting an address corresponding to an applied voltage by said prescribed rotation speed searching means by a function formula calculated from an applied voltage to said DC motor. The fan motor according to claim 4, wherein 7. An electric device on which the fan motor according to claim 1 is mounted. 8. The electric device according to claim 7, wherein the electric device is one of a ventilation fan, a range hood, an air conditioner, and an air purifier.