WO2020021943A1

WO2020021943A1 - Ceiling fan

Info

Publication number: WO2020021943A1
Application number: PCT/JP2019/025284
Authority: WO
Inventors: 理人安北; 浩築比地; 北浦　理; 恵美子濱; 順平小瀬戸
Original assignee: パナソニックＩｐマネジメント株式会社
Priority date: 2018-07-27
Filing date: 2019-06-26
Publication date: 2020-01-30
Also published as: JP7336638B2; JPWO2020021943A1

Abstract

A ceiling fan (100) comprises a shaft secured to a ceiling, a DC motor (2) secured to the shaft, vanes rotated by the DC motor (2), a power source input unit that supplies electric power to the DC motor (2), a current detection unit (13) that detect a current value in the DC motor (2), and a speed adjustment unit (15) that controls the speed of the DC motor (2). When the speed is less than a prescribed speed and the speed of which the rotation of the DC motor (2) is controlled by the speed adjustment unit is equal to or greater than a prescribed speed, the rotation of the DC motor (2) is controlled according to the current value.

Description

Ceiling fan

The present invention relates to a ceiling fan

BACKGROUND ART Conventionally, as a device for controlling the rotation of a blade attached to a motor, a device that detects the current rotation speed of a blade and adjusts the rotation speed in accordance with a difference from a target rotation speed is known (for example, Patent Document 1). 1).

Hereinafter, a general ceiling fan will be described.

A general ceiling fan is composed of an abduction type DC motor whose center is supported by a shaft and blades fixed to the DC motor. A power input section passes through the shaft, and the power input section supplies power from a commercial power supply to a rotation control section above the DC motor. A rotation control unit above the DC motor rotates the DC motor using power supplied from a power input unit. Power is supplied through a wall switch mounted on a wall near the ceiling fan. As the DC motor rotates, wind is supplied from the ceiling side vertically downward.

(5) A method of adjusting the rotation speed of a general ceiling fan 1000 will be described with reference to FIG.

FIG. 5 is a block diagram showing a configuration for controlling the rotation of ceiling fan 1000.

天井 As shown in FIG. 5, the ceiling fan 1000 includes a DC motor 1002, a receiving unit 1007, and a rotation control unit 1005. The rotation control unit 1005 receives, via the reception unit 1007, an operation mode signal that is an instruction to rotate at a predetermined rotation speed from the remote control 1006, and controls the rotation of the DC motor 1002. The rotation control unit 1005 includes a rotation speed constant control unit 1009 that controls the rotation of the DC motor 1002. The rotation speed constant control unit 1009 includes a rotation speed detection unit 1010 and a rotation speed setting unit 1011. The rotation speed detection unit 1010 detects the current rotation speed of the DC motor 1002 and outputs the current rotation speed to the rotation speed setting unit 1011. The rotation speed setting unit 1011 compares the rotation speed set in the rotation speed setting unit 1011 with the current rotation speed of the DC motor 1002 received from the rotation speed detection unit 1010, and performs acceleration / deceleration according to the rotation speed difference. An instruction is output to rotation speed adjustment unit 1015. Then, the rotation speed adjustment unit 1015 adjusts the rotation speed of the DC motor 1002 based on the acceleration / deceleration instruction output from the rotation speed setting unit 1011.

International Publication No. WO 2016/136219

Thus, in the conventional general ceiling fan, only the rotation speed of the DC motor is controlled. In this case, the load applied to the DC motor varies depending on the installation environment of the ceiling fan, for example, the distance between the ceiling fan and the ceiling, so that the power applied to the DC motor differs for each installation environment. That is, since the load and power consumption on the DC motor are different for each installation environment, especially when the ceiling fan is operated near the maximum air volume, the load and power consumption on the DC motor may exceed the specified values. is there.

The present invention has an object to provide a ceiling fan capable of suppressing an increase in a load applied to a motor and an increase in power consumption even when the fan is operated near a maximum air flow regardless of an installation environment.

The ceiling fan according to the present invention, a shaft fixed to the ceiling, a DC motor fixed to the shaft, a plurality of blades rotated by the DC motor, a power input unit that supplies power from a commercial power supply to the DC motor, A current detection unit for detecting a current value in the DC motor; and a rotation speed adjustment unit for controlling the rotation speed of the DC motor. When the rotation speed is less than a predetermined rotation speed, the rotation speed adjustment unit controls the DC motor. Is controlled. When the rotation speed is equal to or higher than the predetermined rotation speed, the rotation of the DC motor is controlled by the current value.

According to the present invention, when the rotation speed is lower than the rotation speed, the rotation of the DC motor is controlled by the rotation speed adjustment unit, and when the rotation speed is equal to or higher than the predetermined rotation speed, the rotation of the DC motor is controlled by the current value. This suppresses an increase in power consumption even when the device is operated near the maximum air flow regardless of the installation environment.

FIG. 1 is a schematic sectional view of a ceiling fan according to Embodiment 1 of the present invention. FIG. 2 is a block diagram of control of the ceiling fan according to Embodiment 1 of the present invention. FIG. 3 is a block diagram of control of the ceiling fan according to Embodiment 2 of the present invention. FIG. 4 is a schematic circuit diagram of a ceiling fan according to Embodiment 2 of the present invention. FIG. 5 is a block diagram of control of a ceiling fan according to the related art.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the embodiments described below exemplify a ceiling fan for embodying the technical idea of the present invention, and the present invention does not specify a ceiling fan as follows. Further, the members described in the claims are not limited to the members of the embodiments. In particular, the dimensions, materials, shapes, relative arrangements, and the like of the constituent members described in the embodiments are not intended to limit the scope of the present invention thereto, unless otherwise specified. It is only an example. In addition, the size, positional relationship, and the like of the members shown in each drawing may be exaggerated for clarity of description. Further, in the following description, the same names and reference numerals denote the same or similar members, and a detailed description thereof will be omitted as appropriate.

The ceiling fan 100 according to the embodiment of the present invention includes a shaft 1 fixed to the ceiling, a DC motor 2 fixed to the shaft 1, a plurality of blades 3 rotated by the DC motor 2, The DC motor 2 includes a power input unit 4 that supplies power to the motor 2, a current detection unit 13 that detects a current value of the DC motor 2, and a rotation speed adjustment unit 15 that controls the rotation speed of the DC motor 2. Thereby, when the rotation speed is less than the predetermined rotation speed, the rotation of the DC motor 2 is controlled by the rotation control unit 5, and when the rotation speed is more than the predetermined rotation speed, the rotation of the DC motor 2 is controlled by the current value. It is possible to do. Therefore, there is an effect that the power consumption can be kept constant even when the operation is performed near the maximum air flow regardless of the installation environment.

Further, ceiling fan 100a according to another embodiment of the present invention further includes a voltage detection unit 16 for detecting a voltage value supplied to power input unit 4, and a voltage value detected by voltage detection unit 16. And a current correction unit 17 for correcting the current value so that the power value supplied to the DC motor 2 becomes a predetermined power value.

(4) By controlling the rotation of the DC motor 2 with the target current value corrected by the current correction unit 17, power consumption can be kept constant regardless of the destination voltage.

(Embodiment 1)
FIG. 1 is a schematic configuration diagram of ceiling fan 100 according to Embodiment 1. In the following, as shown in FIG. 1, the upper portion of the ceiling fan 100 installed on the ceiling, that is, the ceiling side is simply referred to as “upper portion”. Similarly, the lower part when the ceiling fan 100 is installed on the ceiling, that is, the floor side is simply referred to as “lower part”.

As shown in FIG. 1, ceiling fan 100 in the present embodiment includes shaft 1 for fixing ceiling fan 100 to the ceiling. At the end of the shaft 1 on the ceiling side, a fitting for fixing to the ceiling is provided, and the shaft 1 and the ceiling are fixed by the fitting. As shown in FIG. 1, a DC motor 2 is built in a main body (hereinafter, simply referred to as a “main body”) of the ceiling fan 100 connected to the shaft 1, and a plurality of blades rotated by the rotation of the DC motor 2. 3 is provided at the lower part of the main body. As shown in FIG. 1, a power input unit 4 for supplying electric power from a commercial power supply 18 (see FIG. 4) to the DC motor 2 passes through the inside of the ceiling, passes through the shaft 1, and connects to the DC motor 2 inside the main body. Power is supplied to Further, a rotation control unit 5 for controlling the number of rotations of the DC motor 2 is provided inside the main body.

(4) The remote controller 6 as an electronic terminal device for instructing the wind speed transmits a predetermined operation mode signal in accordance with a user operation. The operation mode signal is an instruction to rotate ceiling fan 100 at a predetermined rotation speed corresponding to the wind speed specified by the user. As shown in FIG. 1, a receiving unit 7 is provided below the ceiling fan 100, and the receiving unit 7 receives an operation mode signal transmitted from the remote controller 6.

FIG. 2 is a block diagram showing a configuration for controlling the rotation of ceiling fan 100. As shown in FIG. 2, the rotation control unit 5 of the ceiling fan 100 includes a rotation control determination unit 8, a constant rotation speed control unit 9, and a constant current control unit 12. The rotation control determining unit 8 determines whether the operation mode signal received from the remote controller 6 via the receiving unit 7 is an instruction to rotate the DC motor 2 at low rotation or an instruction to rotate the DC motor 2 at high rotation, and according to the determination result. Control unit 9 or one of the constant current control units 12 to perform control. Specifically, when it is determined that the operation mode signal is an instruction to rotate the DC motor 2 at a low rotation, the control unit 9 causes the rotation speed constant control unit 9 to perform a rotation speed constant control described later. When it is determined that the operation mode signal is an instruction to rotate the DC motor 2 at a high rotation, the control unit 12 causes the constant current control unit 12 to perform constant current control described later. Here, whether a certain operation mode signal is determined to be an instruction to rotate the DC motor 2 at a low rotation or an instruction to rotate the DC motor 2 at a high rotation is determined when the rotation speed of the DC motor 2 is equal to or more than a predetermined number. It is determined by whether or not. This predetermined number may be set in advance according to, for example, the power consumption of the ceiling fan 100. In this case, when the power consumption of the ceiling fan 100 when the DC motor 2 is turned by a certain operation mode signal becomes less than a specified value, the setting is made so as to instruct the DC motor 2 to be turned at a low rotation. In addition, when the power consumption is equal to or more than the specified value due to the installation state of the ceiling fan 100, the setting is made such that the instruction is to rotate the DC motor 2 at high rotation.

Here, the constant rotation speed control unit 9 includes a rotation speed detection unit 10 and a rotation speed setting unit 11. The rotation speed detection unit 10 detects the current rotation speed of the DC motor 2 and outputs the current rotation speed to the rotation speed setting unit 11. The rotation speed setting unit 11 compares the target rotation speed set in the rotation speed setting unit 11 with the current rotation speed of the DC motor 2 received from the rotation speed detection unit 10, and performs acceleration / deceleration according to the rotation speed difference. Is output to the rotation speed adjusting unit 15.

(4) The constant current control unit 12 includes a current detection unit 13 and a current increase / decrease determination unit 14. The current detection unit 13 detects a current output current value of the DC motor 2 and outputs a converted value of the detected output current value to the current increase / decrease determination unit 14. The current increase / decrease determiner 14 compares the target current value set in the current increase / decrease determiner 14 with the output current value received from the current detector 13 and rotates according to the difference between the target current value and the output current value. An instruction for acceleration / deceleration is output to the number adjusting unit 15.

The rotation speed adjustment unit 15 changes the rotation speed of the DC motor 2 based on the instructions from the rotation speed setting unit 11 and the current increase / decrease determination unit 14. For example, when the current rotation speed is higher than the target rotation speed and when the output current value is higher than the target current value, the rotation speed adjustment unit 15 controls the DC motor 2 to reduce the rotation speed. When the current rotation speed is smaller than the target rotation speed and when the output current value is smaller than the target current value, the rotation speed adjustment unit 15 controls the DC motor 2 to increase the rotation speed.

運転 The operation of the ceiling fan 100 of the present embodiment will be described separately for a low rotation operation and a high rotation operation.

First, low-speed operation will be described with reference to FIG. The rotation control unit 5 performs a constant rotation speed control that is a control for keeping the rotation speed of the DC motor 2 constant during the low rotation operation. The rotation speed constant control is realized by the rotation control determination unit 8, the rotation speed constant control unit 9 (the rotation speed detection unit 10 and the rotation speed setting unit 11), and the rotation speed adjustment unit 15 operating in cooperation. You.

詳細 Details of the rotation speed constant control will be described. When the rotation control unit 5 selects the low rotation operation, that is, the rotation control determination unit 8 determines that the operation mode signal received from the remote controller 6 via the reception unit 7 is an instruction to rotate the motor at low rotation. In this case, the constant rotation speed control unit 9 performs constant rotation speed control. A target rotation speed corresponding to the operation mode is set in the rotation speed setting unit 11. Here, for example, a target rotation speed corresponding to the operation mode is stored in the rotation speed setting unit 11, and a corresponding target rotation speed is set based on the operation mode signal received via the reception unit 7. Further, the rotation speed detecting unit 10 detects the current rotation speed of the DC motor 2. The rotation speed setting unit 11 compares the rotation speed detected by the rotation speed detection unit 10 with the target rotation speed set in the rotation speed setting unit 11, and issues an acceleration / deceleration instruction according to the rotation speed difference. 15 is output. That is, if the current rotation speed is smaller than the target rotation speed, the rotation speed setting unit 11 instructs the rotation speed adjustment unit 15 to increase the motor output. Conversely, if the current rotation speed is higher than the target rotation speed, the rotation speed setting unit 11 instructs the rotation speed adjustment unit 15 to decrease the motor output. Then, the rotation speed detection unit 10 detects the rotation speed of the DC motor 2 whose rotation speed has been adjusted by the rotation speed adjustment unit 15 again, and based on the instruction from the rotation speed setting unit 11, the rotation speed adjustment unit 15 The control for keeping the rotation speed constant is performed by repeating the adjustment of the rotation speed of 2. By performing the above control, constant rotation speed control is realized.

課題 The problem of the above-mentioned constant rotation speed control will be described below.

The ceiling fan 100 can adjust the distance from the floor to the ceiling fan 100 according to the installation environment by changing the length of the shaft 1. For example, by shortening the shaft 1, the distance between the ceiling fan 100 and the ceiling is shortened. By reducing the distance between the ceiling fan 100 and the ceiling, the viscous friction of the air blown by the blades 3 of the ceiling fan 100 increases, and even at the same rotation speed, the load required for rotation increases, and Power consumption also increases. Therefore, the load applied to the motor varies depending on the installation environment of the ceiling fan 100, and thus the power applied to the motor differs for each installation environment. As described above, depending on the installation environment, the load applied to the motor and the power consumption increase. Therefore, in particular, when the ceiling fan 100 is operated near the maximum air volume, there is a problem that the load and the power consumption applied to the DC motor 2 exceed the specified values. The specified value here is, for example, a load that can be applied to the DC motor 2 and a value that is an upper limit of power consumption.

In the present invention, in order to solve the above-described problems, depending on the installation environment, at the time of high rotation that may exceed the specified value of the power consumption, the ceiling fan 100 performs the constant current control to keep the load and the power consumption constant. Control to keep.

Hereinafter, the high-speed operation will be described with reference to FIG.

The rotation control unit 5 detects a value of an output current flowing through the DC motor 2 during a high rotation operation, and performs a constant current control, which is a control for maintaining a constant value. The constant current control is realized by the rotation control determination unit 8, the constant current control unit 12 (the current detection unit 13 and the current increase / decrease determination unit 14), and the rotation speed adjustment unit 15 operating in cooperation.

詳細 The details of the constant current control will be described.

When the rotation control unit 5 selects the high rotation operation, that is, the rotation control determination unit 8 determines that the operation mode signal received from the remote controller 6 via the reception unit 7 is an instruction to rotate the motor at high rotation. In this case, the constant current control unit 12 performs constant current control. Here, a target current value according to the operation mode is set in the current increase / decrease determination unit 14. For example, a target current value corresponding to the operation mode is stored in the current increase / decrease determination unit 14, and a corresponding target current value is set based on the operation mode received via the reception unit 7. The target current value is set so as not to exceed the specified value of the power consumption.

(4) The current detector 13 detects a current value of the current of the DC motor 2. Here, an example of a method of realizing the current detection unit 13 will be described below.

As a method for detecting the output current of the DC motor 2, there is, for example, a method using a shunt resistor 25 as shown in FIG. FIG. 4 is a schematic circuit diagram of the ceiling fan 100a according to the second embodiment, but the method for detecting the output current of the DC motor 2 is the same for the ceiling fan 100 according to the first embodiment. This will be described with reference to FIG.

(4) When a current flows through the shunt resistor 25 having a low resistance value shown in FIG. 4, a voltage difference is generated at both ends of the shunt resistor 25 in proportion to the current. This voltage value is read and amplified by the operational amplifier 23. The microcomputer 24 reads the amplified value to detect the current value of the DC motor 2.

The current increase / decrease determiner 14 compares the current value of the DC motor 2 detected by the current detector 13 with the target current value set in the current increase / decrease determiner 14, and issues an acceleration / deceleration instruction according to the difference. The output is output to the rotation speed adjusting unit 15. That is, if the current current value is smaller than the set target current value, the current increase / decrease determination unit 14 instructs the rotation speed adjustment unit 15 to increase the motor output. Conversely, if the current value is larger than the set target current value, the current increase / decrease determination unit 14 instructs the rotation speed adjustment unit 15 to decrease the motor output. Then, the current detection unit 13 detects the current value of the DC motor 2 whose rotation speed has been adjusted by the rotation speed adjustment unit 15 again, and based on the instruction from the current increase / decrease determination unit 14, the rotation speed adjustment unit 15 The control for keeping the current value constant by repeating the adjustment of the number of rotations is performed. The above control is the constant current control. Therefore, even when the load and power consumption applied to the motor differ depending on the installation environment of the ceiling fan 100, the output current of the DC motor 2 is kept constant by the constant current control of the rotation control unit 5, and the DC motor 2 Power consumption can be made constant.

As described above, in the above-described constant current control, when the same power supply voltage is used, even if the installation environment of the ceiling fan 100, that is, the distance between the ceiling fan 100 and the ceiling is different, the load and power consumption of the DC motor 2 are different. Can be kept constant.

(Embodiment 2)
In the first embodiment, by controlling the current applied to DC motor 2 on the assumption that the power supply voltage is constant, ceiling fan 100 capable of keeping the power consumption of DC motor 2 constant regardless of the installation environment. Was explained.

However, when the power supply voltage is not constant, that is, when the ceiling fan is used in an area where the power supply voltage is different, the voltage applied to the DC motor 2 is different. When different power supply voltages are applied to the ceiling fan, it is difficult to keep the load and power consumption of the DC motor 2 constant only by current control. For example, the power supply voltage in Malaysia is 240V, and the power supply voltage in Vietnam is 220V. Therefore, with only the constant current control described in the first embodiment, the power consumption of the DC motor 2 is larger when using the power supply voltage of 240 V in Malaysia than when using the power supply voltage of 220 V in Vietnam. I will. That is, there is a problem in that when only the current applied to the DC motor 2 is controlled when the voltage is used in each area where the voltage is different, the power consumption of the DC motor 2 cannot be made constant.

Therefore, in the second embodiment, by controlling the power supplied to the DC motor 2, even when the power supply voltage applied to the power supply input unit 4 is different, the power consumption in the DC motor 2 can be kept constant. The ceiling fan 100a that can be used will be described. Hereinafter, this control is referred to as constant power control.

The constant power control means, in addition to the constant current control described in the first embodiment, a power supply voltage is detected, and the balance between the power supply voltage and the output current of the DC motor 2 is kept constant. This is a control for keeping the power consumption of the power supply constant.

First, the configuration of the ceiling fan 100a according to the second embodiment will be described with reference to FIG. 3, focusing on differences from the ceiling fan 100 according to the first embodiment.

The ceiling fan 100a according to the second embodiment includes a rotation control unit 5a instead of the rotation control unit 5 of the ceiling fan 100 according to the first embodiment.

Rotation control section 5a has a constant power control section 12a instead of constant current control section 12 according to the first embodiment. The constant power control unit 12a performs constant power control when the rotation control determination unit 8 determines that the operation mode signal is an instruction to rotate the DC motor 2 at high rotation. The constant power control unit 12a includes a current increase / decrease determination unit 14a, a voltage detection unit 16, and a current correction unit 17 in addition to the current detection unit 13 according to the first embodiment.

(4) The voltage detection unit 16 detects the power supply voltage input to the power supply input unit 4 and outputs a converted value of the power supply voltage to the current correction unit 17. Further, the current correction unit 17 receives the converted value of the power supply voltage output from the voltage detection unit 16, and sends an instruction to change the target current value to the current increase / decrease determination unit 14a according to the received converted value of the power supply voltage. .

The current increase / decrease determiner 14a differs from the current increase / decrease determiner 14 according to the first embodiment in that the target current value is changed based on the instruction received from the current corrector 17. The current increase / decrease determination unit 14a compares the target current value (the changed target current value when instructed by the current correction unit 17) with the output current value received from the current detection unit 13, and The point that the instruction of acceleration / deceleration is output to the rotation speed adjusting unit 15 in accordance with the difference between the current value and the output current value is the same as the current increase / decrease determination unit 14 according to the first embodiment. The rotation speed adjustment unit 15 changes the rotation speed of the DC motor 2 based on the instructions from the rotation speed setting unit 11 and the current increase / decrease determination unit 14a. For example, when the output current value is larger than the target current value, the current increase / decrease determination unit 14a transmits a deceleration instruction to the rotation speed adjustment unit 15. Then, the rotation speed adjusting unit 15 controls the DC motor 2 to reduce the rotation speed. When the output current value is smaller than the target current value, the current increase / decrease determination unit 14a transmits an instruction for acceleration to the rotation speed adjustment unit 15. Then, the rotation speed adjusting unit 15 controls the DC motor 2 to increase the rotation speed.

Next, the circuit configuration of the rotation control unit 5a will be described with reference to FIG.

As shown in FIG. 4, the rotation control unit 5a includes a diode bridge 20, a DC power supply 21, a regulator (REG) 22, an operational amplifier 23, a microcomputer (microcomputer) 24, a shunt resistor 25, and a motor control IC 26. The microcomputer (microcomputer) 24 receives a signal input to each port and outputs an instruction to control the DC motor 2. The motor control integrated circuit (IC) 26 controls the rotation of the DC motor 2. Further, the motor control IC 26 detects the number of rotations of the DC motor 2 and outputs it to the microcomputer 24. The shunt resistor 25 converts the output current of the DC motor 2 into a voltage. The operational amplifier 23 receives the power supply voltage and the motor output current, converts each value to the microcomputer 24, and outputs the converted value.

The functions of the rotation speed detector 10, the current detector 13, and the voltage detector 16 shown in FIG. 3 are realized by the motor control IC 26 shown in FIG. The functions of the rotation speed setting unit 11, the current increase / decrease determination unit 14a, and the current correction unit 17 shown in FIG. 3 are realized by the microcomputer 24 shown in FIG.

Here, an example of a method for detecting the power supply voltage will be described with reference to FIG.

(4) The AC power supply voltage 19 input from the commercial power supply 18 is converted into the DC power supply 21 by the diode bridge 20. A DC power source 21 is used as a power source for the DC motor 2. The microcomputer 24 reads the DC power supply 21 through the operational amplifier 23 to detect the voltage of the commercial power supply 18.

As shown in FIG. 3, based on the detected power supply voltage value, the current correction unit 17 selects a correction value of the current so that the power value becomes constant, and sets the target current set in the current increase / decrease determination unit 14a. Correct the value. The current correction value is, for example, the value of “specified value of power value / detected power supply voltage value”. The current increase / decrease determiner 14a compares the current value detected by the current detector 13 with the target current value set in the current increase / decrease determiner 14a (if corrected, the corrected target current value). Then, an instruction for acceleration / deceleration is output to the rotation speed adjusting unit 15 according to the difference. That is, if the current current value is smaller than the set target current value, the current increase / decrease determination unit 14a instructs the rotation speed adjustment unit 15 to increase the motor output. Conversely, if the current current value is larger than the set target current value, the current increase / decrease determination unit 14a instructs the rotation speed adjustment unit 15 to decrease the motor output. The current value of the DC motor 2 whose rotation speed has been adjusted by the rotation speed adjustment unit 15 is detected by the current detection unit 13 again, and the rotation speed adjustment unit 15 rotates the DC motor 2 based on an instruction from the current increase / decrease determination unit 14a. Control is performed to keep the current value constant by repeating the number adjustment. The above control is the constant power control.

一定 With this constant power control, the power consumption of the motor can be kept constant even in countries where the voltage of the commercial power supply 18 is different.

The ceiling fan according to the present invention is useful as a technique used for ceiling fan control in which the blades are easily affected by disturbance.

Reference Signs List 1 shaft 2 DC motor 3 blade 4

power input unit

5, 5a rotation control unit 6 remote controller 7 reception unit 8 rotation control determination unit 9 rotation speed constant control unit 10 rotation speed detection unit 11 rotation

speed setting unit

12, 12a constant current control Unit 13

current detection unit

14, 14a current increase / decrease determination unit 15 rotation speed adjustment unit 16 voltage detection unit 17 current correction unit 18 commercial power supply 19 AC power supply voltage 20 diode bridge 21 DC power supply 22 regulator 23 operational amplifier 24 microcomputer 25 shunt resistor 26 motor control IC
100, 100a, 1000 ceiling fan 1002 DC motor 1005 rotation control unit 1006 remote control 1007 reception unit 1009 constant rotation speed control unit 1010 rotation speed detection unit 1011 rotation speed setting unit 1015 rotation speed adjustment unit

Claims

A shaft fixed to the ceiling,
A DC motor fixed to the shaft;
A blade rotated by the DC motor;
A power input unit that supplies power from the commercial power supply to the DC motor,
A current detector for detecting a current value in the DC motor;
A rotation speed adjustment unit that controls the rotation speed of the DC motor,
When the rotation speed is less than a predetermined rotation speed, the rotation speed adjustment unit controls the rotation of the DC motor,
When the rotation speed is equal to or higher than a predetermined rotation speed, the rotation of the DC motor is controlled by a current value.
The ceiling fan further includes a voltage detection unit that detects a voltage value supplied to the power input unit,
A current correction unit that corrects a current value so that the power value supplied to the DC motor becomes a predetermined power value based on the voltage value detected by the voltage detection unit,
The ceiling fan according to claim 1, wherein the number of rotations of the DC motor is controlled by a current value corrected by the current correction unit.
A shaft fixed to the ceiling,
A DC motor fixed to the shaft;
A blade rotated by the DC motor;
A power input unit for supplying power to the DC motor from a commercial power supply,
A current detector for detecting a current value in the DC motor;
A rotation speed adjustment unit that controls the rotation speed of the DC motor;
In the case where the rotation speed of the DC motor is changed, whether or not the changed rotation speed is equal to or more than a predetermined number that is a specified value that is an upper limit of the power value supplied from the power input unit to the DC motor. A rotation control determining unit for determining whether
When the rotation control determination unit makes a positive determination, the rotation speed adjustment unit based on the current value detected by the current detection unit and a target current value corresponding to the changed rotation speed. And a current increase / decrease determination unit for controlling the rotation speed of the DC motor.
The ceiling fan further includes a voltage detection unit that detects a voltage value supplied to the power input unit,
A current correction for correcting the target current value in the current increase / decrease determination unit based on the voltage value detected by the voltage detection unit so that the power value supplied to the DC motor does not exceed the specified value. And a part,
The current increase / decrease determination unit instructs the rotation speed adjustment unit to increase or decrease the rotation speed of the DC motor based on a difference between the current value detected by the current detection unit and the corrected target current value. The ceiling fan according to claim 3, characterized in that: