JP7336638B2 - ceiling fan - Google Patents

Description

The present invention relates to a ceiling fan

Conventionally, as a device for controlling the rotation of blades attached to a motor, there has been known a device that detects the current number of rotations of the blades and adjusts the number of rotations according to the difference from the target number of rotations (for example, patent documents 1).

A typical ceiling fan will be described below.

A typical ceiling fan is composed of an outer-rotating 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 located on the top of the DC motor. A rotation control unit located above the DC motor rotates the DC motor using power supplied from the power input unit. Also, power is supplied via a wall switch attached to the wall near the ceiling fan. Wind is supplied vertically downward from the ceiling side by rotating the DC motor.

Also, a method for adjusting the rotation speed of a typical 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. As shown in FIG.

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

WO2016/136219

In this way, 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. That is, since the load and power consumption on the DC motor differ depending on the installation environment, there are cases where the load and power consumption on the DC motor exceed the specified values, especially when the ceiling fan is operated near the maximum air volume. be.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a ceiling fan capable of suppressing an increase in the load applied to the motor and power consumption even when the ceiling fan is operated near the maximum air volume regardless of the installation environment.

A ceiling fan according to the present invention includes a shaft fixed to a ceiling, a DC motor fixed to the shaft, blades rotated by the DC motor, and a power input unit supplying power from a commercial power supply to the DC motor. , a current detection unit for detecting a current value in the DC motor; a rotation speed adjustment unit for controlling the rotation speed of the DC motor; A rotation control determination unit that determines whether or not the power value supplied to the DC motor is equal to or greater than a predetermined number that is a specified value that is the upper limit, and current detection if the rotation control determination unit makes a positive determination. a current increase/decrease determination unit that causes the rotation speed adjustment unit to control the rotation speed of the DC motor based on the current value detected by the unit and the target current value corresponding to the changed rotation speed.

According to the present invention, the rotation of the DC motor is controlled by the rotation speed adjustment unit when the rotation speed is less than the rotation speed, and the rotation of the DC motor is controlled by the current value when the rotation speed is equal to or higher than the predetermined rotation speed. As a result, the increase in power consumption can be suppressed even when operating near the maximum air volume, regardless of the installation environment.

FIG. 1 is a schematic cross-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 conventional ceiling fan.

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. However, the embodiment shown below is an example of a ceiling fan for embodying the technical idea of the present invention, and the present invention does not specify the ceiling fan as follows. In addition, the members shown in the claims are by no means specified as the members of the embodiments. Unless otherwise specified, the dimensions, materials, shapes, relative arrangements, etc. of the constituent members described in the embodiments are not meant to limit the scope of the present invention and are merely explanations. Just an example. Note that the sizes and positional relationships of members shown in each drawing may be exaggerated for clarity of explanation. Furthermore, in the following description, the same names and symbols indicate the same or homogeneous members, and detailed description thereof will be omitted as appropriate.

A ceiling fan 100 according to an embodiment of the present invention includes a shaft 1 fixed to a ceiling, a DC motor 2 fixed to the shaft 1, a plurality of blades 3 rotated by the DC motor 2, and a DC power supply from a commercial power supply 18. A power input unit 4 that supplies electric power to the motor 2 , a current detection unit 13 that detects a current value in the DC motor 2 , and a rotation speed adjustment unit 15 that controls the rotation speed of the DC motor 2 are provided. As a result, 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 equal to or higher than the predetermined rotation speed, the rotation of the DC motor 2 is controlled by the current value. It becomes possible to Therefore, there is an effect that the power consumption can be kept constant even when the air conditioner is operated near the maximum air volume regardless of the installation environment.

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

As a result, by controlling the rotation of the DC motor 2 with the target current value corrected by the current correction unit 17, the power consumption can be kept constant regardless of the voltage at the destination.

(Embodiment 1)
FIG. 1 is a schematic configuration diagram of a ceiling fan 100 according to Embodiment 1. FIG. In the following, as shown in FIG. 1, the upper part of the ceiling fan 100 installed on the ceiling, that is, the ceiling side, is simply referred to as "upper part". Similarly, the lower part of the ceiling fan 100 installed on the ceiling, that is, the floor side is simply referred to as the "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. A metal fitting for fixing to the ceiling is provided at the end of the shaft 1 on the ceiling side, and the shaft 1 and the ceiling are fixed by the metal fitting. Further, as shown in FIG. 1, a DC motor 2 is built in a main body (hereinafter simply referred to as "main body") of the ceiling fan 100 connected to the shaft 1, and a plurality of blades are rotated by the rotation of the DC motor 2. 3 is provided at the bottom of the body. Further, as shown in FIG. 1, a power supply input unit 4 that supplies power from a commercial power supply 18 (see FIG. 4) to the DC motor 2 passes through the inside of the ceiling and passes through the shaft 1 to the DC motor 2 inside the main body. is supplying power to Further, a rotation control section 5 for controlling the number of rotations of the DC motor 2 is provided inside the main body.

Further, a remote controller 6 as an electronic terminal device for instructing the wind speed transmits a predetermined operation mode signal according to user's operation. The operation mode signal is an instruction to rotate ceiling fan 100 at a predetermined number of revolutions corresponding to the wind speed instructed by the user. As shown in FIG. 1, the ceiling fan 100 has a receiver 7 below it, and the receiver 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 the ceiling fan 100. As shown in FIG. As shown in FIG. 2 , the rotation control section 5 of the ceiling fan 100 includes a rotation control determination section 8 , a constant rotation speed control section 9 and a constant current control section 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 speed or an instruction to rotate the DC motor 2 at high rotation speed. Then, either the rotation speed constant control section 9 or the current constant control section 12 is caused 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 speed, the rotation speed constant control unit 9 is caused to perform rotation speed constant control, which will be described later. Further, when it is determined that the operation mode signal is an instruction to rotate the DC motor 2 at a high speed, the constant current control unit 12 is caused to perform constant current control, which will be described later. Here, whether a given operation mode signal is determined to be an instruction to rotate the DC motor 2 at a low speed or an instruction to rotate the DC motor 2 at a high speed depends on whether the number of rotations of the DC motor 2 is a predetermined number or more. or not. This predetermined number may be set in advance according to the power consumption of the ceiling fan 100, for example. In this case, if the power consumption of the ceiling fan 100 when the DC motor 2 is rotated by a certain operation mode signal is less than a specified value, it is set to instruct to rotate the DC motor 2 at a low speed. Further, when the power consumption exceeds a specified value depending on the installation state of the ceiling fan 100, the instruction is set to rotate the DC motor 2 at a high speed.

The rotation speed constant 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 it 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 and the current rotation speed of the DC motor 2 received from the rotation speed detection unit 10, and accelerates or decelerates according to the rotation speed difference. is output to the rotational speed adjustment unit 15 .

Further, the constant current control section 12 includes a current detection section 13 and a current increase/decrease determination section 14 . The current detection unit 13 detects the 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 determination unit 14 compares the target current value set in the current increase/decrease determination unit 14 with the output current value received from the current detection unit 13, and rotates according to the difference between the target current value and the output current value. Acceleration/deceleration instructions are output to the number adjustment unit 15 .

The rotation speed adjustment unit 15 changes the rotation speed of the DC motor 2 based on 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. Further, 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.

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

First, the low rotation speed operation will be described with reference to FIG. The rotation control unit 5 performs rotation speed constant control, which is control to keep the rotation speed of the DC motor 2 constant during low rotation operation. The rotation speed constant control is realized by cooperative operation of 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. be.

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 rotation speed constant control unit 9 performs rotation speed constant control. A target rotation speed corresponding to the operation mode is set in the rotation speed setting unit 11 . Here, for example, the rotation speed setting unit 11 stores the target rotation speed corresponding to the operation mode, and the corresponding target rotation speed is set based on the operation mode signal received via the reception unit 7 . Further, the rotation speed detection 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 and the target rotation speed set in the rotation speed setting unit 11, and instructs acceleration/deceleration according to the rotation speed difference to the rotation speed adjustment unit. 15. 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 greater 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 of the DC motor 2 whose rotation speed is adjusted by the rotation speed adjustment unit 15 is again detected by the rotation speed detection unit 10, and the rotation speed adjustment unit 15 adjusts the DC motor based on the instruction from the rotation speed setting unit 11. 2 is repeated to keep the rotation speed constant. By performing the above control, the rotation speed constant control is realized.

Problems with the constant rotation speed control described above will be described below.

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

In order to solve the above-mentioned problems, the present invention keeps the load and power consumption constant by performing constant current control of the ceiling fan 100 at high speeds when the power consumption may exceed the specified value depending on the installation environment. control to keep

The high-speed operation will be described below with reference to FIG.

Rotation control unit 5 detects the value of the output current flowing through DC motor 2 during high-speed operation, and performs constant current control, which is control to keep the output current constant. The constant current control is realized by cooperative operation of the rotation control determination section 8, current constant control section 12 (current detection section 13 and current increase/decrease determination section 14), and rotation speed adjustment section 15. FIG.

Details of the constant current control will be described.

When the rotation control unit 5 selects 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 corresponding to the operation mode is set in the current increase/decrease determination unit 14 . For example, the current increase/decrease determination unit 14 stores a target current value corresponding to the operation mode, and the 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 power consumption value.

A current detector 13 detects the current value of the DC motor 2 . An example of a method for realizing the current detection unit 13 will be described below.

As a method for detecting the output current of the DC motor 2, for example, there is a method using a shunt resistor 25 as shown in FIG. Although FIG. 4 is a schematic circuit diagram of the ceiling fan 100a according to Embodiment 2, the method of detecting the output current of the DC motor 2 is the same as that of the ceiling fan 100 according to Embodiment 1. Description will be made with reference to FIG.

When current flows through the shunt resistor 25 having a low resistance value shown in FIG. 4, a voltage difference proportional to the current is generated across the shunt resistor 25 . This voltage value is read and amplified by the operational amplifier 23 . The current value of the DC motor 2 is detected by reading the amplified value with the microcomputer 24 .

The current increase/decrease determination unit 14 compares the current value of the DC motor 2 detected by the current detection unit 13 with the target current value set in the current increase/decrease determination unit 14, and instructs acceleration/deceleration according to the difference. Output to the rotational speed adjustment unit 15 . That is, if the current current value is smaller than the set target current value, the current increase/decrease determination section 14 instructs the rotation speed adjustment section 15 to increase the motor output. Conversely, if the current current value is greater than the set target current value, the current increase/decrease determination section 14 instructs the rotational speed adjustment section 15 to decrease the motor output. Then, the current value of the DC motor 2 whose rotation speed is adjusted by the rotation speed adjustment portion 15 is again detected by the current detection portion 13, and the rotation speed adjustment portion 15 adjusts the DC motor 2 based on the instruction from the current increase/decrease determination portion 14. The control to keep the current value constant is performed by repeating the adjustment of the rotation speed. The above control is constant current control. Therefore, even if the load applied to the motor and the power consumption vary depending on the installation environment of the ceiling fan 100, the output current of the DC motor 2 is kept constant by the current constant control of the rotation control unit 5, and the DC motor 2 power consumption can be kept constant.

In this way, in the constant current control described above, even if the installation environment of the ceiling fan 100, that is, the distance between the ceiling fan 100 and the ceiling is different when the power supply voltage is the same, the load and power consumption of the DC motor 2 can be made constant.

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

However, if the power supply voltage is not constant, that is, if the ceiling fan is used in areas with different power supply voltages, the voltage applied to the DC motor 2 will be 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, power supply voltage in Malaysia is 240V and power supply voltage in Vietnam is 220V. Therefore, with only the constant current control described in Embodiment 1, the power consumption of the DC motor 2 is greater when used with a power supply voltage of 240V in Malaysia than when used with a power supply voltage of 220V in Vietnam. put away. That is, there is a problem that the power consumption of the DC motor 2 cannot be made constant if only the current applied to the DC motor 2 is controlled when the DC motor 2 is used in regions with different voltages.

Therefore, in the second embodiment, by controlling the power supplied to the DC motor 2, the power consumption of the DC motor 2 can be kept constant even when the power supply voltage applied to the power supply input unit 4 is different. A ceiling fan 100a that can be used will be described. In addition, below, this control is called electric power constant control.

In addition to the constant current control described in Embodiment 1, the constant power control detects the power supply voltage and maintains a constant balance between the power supply voltage and the output current of the DC motor 2, thereby controlling the ceiling fan 100a regardless of the power supply voltage. This control keeps the power consumption constant.

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

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

The rotation control unit 5a has a constant power control unit 12a instead of the constant current control unit 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 speed. The constant power control unit 12a has 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.

The voltage detection unit 16 detects the power supply voltage input to the power supply input unit 4 and outputs the 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 based on the received converted value of the power supply voltage. .

The current increase/decrease determination unit 14a differs from the current increase/decrease determination unit 14 according to the first embodiment in that it changes the target current value based on the instruction received from the current correction unit 17. FIG. The current increase/decrease determination unit 14a compares the target current value (target current value after change if instructed by the current correction unit 17) with the output current value received from the current detection unit 13, and determines the target current value. It is the same as the current increase/decrease determination unit 14 according to the first embodiment in that an acceleration/deceleration instruction is output to the rotation speed adjustment unit 15 according to the difference between the value and the output current value. The rotation speed adjustment unit 15 changes the rotation speed of the DC motor 2 based on 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 rotational speed adjustment unit 15. FIG. Then, the rotation speed adjustment unit 15 controls the DC motor 2 to reduce the rotation speed. Further, when the output current value is smaller than the target current value, the current increase/decrease determination section 14a transmits an acceleration instruction to the rotational speed adjustment section 15. FIG. Then, the rotation speed adjustment unit 15 controls the DC motor 2 to increase the rotation speed.

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

As shown in FIG. 4, the rotation controller 5a has a diode bridge 20, a DC power supply 21, a regulator (REG) 22, an operational amplifier 23, a microcomputer 24, a shunt resistor 25, and a motor control IC 26. A microcomputer (microcomputer) 24 receives signals input to each port and outputs instructions for controlling the DC motor 2 . A motor control integrated circuit (IC) 26 controls the rotation of the DC motor 2 . Also, the motor control IC 26 detects the rotation speed of the DC motor 2 and outputs it to the microcomputer 24 . A 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 it.

It should be noted that the rotation speed detection unit 10, the current detection unit 13, and the voltage detection unit 16 shown in FIG. 3 realize their functions by the motor control IC 26 shown in FIG. Further, the rotation speed setting unit 11, the current increase/decrease determination unit 14a, and the current correction unit 17 shown in FIG. 3 realize their functions by the microcomputer 24 shown in FIG.

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

An AC power supply voltage 19 input from a commercial power supply 18 is converted into a DC power supply 21 by a diode bridge 20 . A DC power supply 21 is used as a power supply for the DC motor 2 . The voltage of the commercial power supply 18 is detected by reading the DC power supply 21 through the operational amplifier 23 with the microcomputer 24 .

As shown in FIG. 3, based on the detected power supply voltage value, the current correction unit 17 selects a current correction value so that the power value becomes constant, and selects the target current set in the current increase/decrease determination unit 14a. Correct the value. The correction value of the current is, for example, the value of "specified power value/detected power supply voltage value". The current increase/decrease determination unit 14a compares the current value detected by the current detection unit 13 with a target current value set in the current increase/decrease determination unit 14a (target current value after correction if corrected). , an acceleration/deceleration instruction is output to the rotational speed adjustment 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 section 14a instructs the rotational speed adjustment section 15 to increase the motor output. Conversely, if the current current value is greater than the set target current value, the current increase/decrease determination section 14a instructs the rotational speed adjustment section 15 to decrease the motor output. The current value of the DC motor 2 whose rotation speed is adjusted by the rotation speed adjustment unit 15 is again detected by the current detection unit 13, and the rotation speed adjustment unit 15 rotates the DC motor 2 based on the instruction from the current increase/decrease determination unit 14a. By repeating the adjustment of the number, control is performed to keep the current value constant. The above control is constant power control.

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

INDUSTRIAL APPLICABILITY The ceiling fan according to the present invention is useful as a technique used for controlling a ceiling fan whose blades are susceptible to disturbance.

REFERENCE SIGNS LIST 1 shaft 2 DC motor 3 blade 4 power supply 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 current constant control Unit 13 Current detection unit 14, 14a Current increase/decrease determination unit 15 Rotational 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 controller 1006 remote controller 1007 receiver 1009 rotation speed constant controller 1010 rotation speed detection unit 1011 rotation speed setting unit 1015 rotation speed adjustment unit

Claims (2)

a shaft fixed to the ceiling;
a DC motor fixed to the shaft;
a vane rotated by the DC motor;
a power supply input unit that supplies power to the DC motor from a commercial power supply,
a current detection unit that detects a current value in the DC motor;
a rotation speed adjustment unit that controls the rotation speed of the DC motor;
When changing the number of rotations of the DC motor, whether or not the number of rotations after the change is equal to or greater than a predetermined number that is the upper limit of the power value supplied to the DC motor from the power supply input unit. a rotation control determination unit that determines whether
When the rotation control determination unit makes a positive determination, the rotation speed adjustment unit adjusts the rotation speed based on the current value detected by the current detection unit and the target current value corresponding to the changed rotation speed. and a current increase/decrease determination unit that controls 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 supply input unit;
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
The current increase/decrease determination unit instructs the rotation speed adjustment unit to increase/decrease the rotation speed of the DC motor based on a difference between the current value detected by the current detection unit and a corrected target current value. The ceiling fan according to claim 1 , characterized by:

Images