WO2016056198A1 - 天井扇風機 - Google Patents
天井扇風機 Download PDFInfo
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- WO2016056198A1 WO2016056198A1 PCT/JP2015/004897 JP2015004897W WO2016056198A1 WO 2016056198 A1 WO2016056198 A1 WO 2016056198A1 JP 2015004897 W JP2015004897 W JP 2015004897W WO 2016056198 A1 WO2016056198 A1 WO 2016056198A1
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- Prior art keywords
- air volume
- current
- unit
- ceiling
- motor
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/06—Arrangements for speed regulation of a single motor wherein the motor speed is measured and compared with a given physical value so as to adjust the motor speed
Definitions
- the present invention relates to a ceiling fan using a sensorless brushless DC motor.
- ceiling fans have been increasingly used as a means for improving cooling efficiency and heating efficiency by generating cool air in summer and circulating warm air gathered near the ceiling in winter.
- brushless DC motors are increasingly used for electric motors used in ceiling fans for purposes such as controllability, energy saving, miniaturization, and weight reduction.
- FIG. 7 is a block diagram showing a conventional ceiling fan.
- the ceiling fan 101 includes a blade 102, a brushless DC motor 103 that rotates the blade, a control circuit 104 that controls the brushless DC motor 103, and an illuminator 105 attached to the lower part of the ceiling fan 101.
- the control circuit 104 performs control so as to keep the rotation speed of the blades 102 attached to the brushless DC motor 103 constant.
- the current detection unit is configured to be connected between a portion where the negative potential side terminals of the switching elements constituting the lower stage of the inverter circuit are combined into one and the circuit ground.
- Patent Document 1 A problem in a ceiling fan using a conventional brushless DC motor as shown in Patent Document 1 will be described.
- the air volume is proportional to the rotational speed.
- the installation pole is installed in a state where it is close to the ceiling by changing the length of the mounting pole, and when it is installed in a state where the installation pole is away from the ceiling to some extent, the increase or decrease in the work amount of the blades even at the same rotation speed Depending on the airflow.
- the air volume decreases as it approaches the ceiling.
- the space in which the air flows to the inner peripheral portion of the blade is widened, and the airflow is also sent out at the inner peripheral portion of the blade. For this reason, the air volume increases as the distance from the ceiling increases.
- FIG. 8 is a relationship diagram showing the relationship between the blade-to-ceiling distance, the air volume, and the rotation speed in the target air volume of the conventional ceiling fan.
- FIG. 9 is a relationship diagram showing the relationship between the blade-to-ceiling distance, the rotation speed, and the power consumption in the target air volume of the ceiling fan.
- the air volume was 284 m 3 / min and the power consumption was 39 W.
- This state is defined as the air volume setting strength
- the air volume 284 m 3 / min at this time is defined as the “strong air volume” at the time of the strong setting.
- the air volume becomes 307 m 3 / min, which is larger than the strong air volume, and the power consumption is 32 W.
- the rotational speed needs to be 220 r / min. In other words, the power consumption is more than the target amount of strong air.
- the rotational speed needs to be 245 r / min.
- the current of the motor is measured by the current detection unit.
- the motor current can be detected only by the three-phase combined current.
- the switching element is a driver assembly, a current necessary for the driver is detected. Therefore, there is a problem that an accurate phase current of the motor cannot be detected.
- the present invention solves the above conventional problems.
- the present invention detects the current flowing through the motor with high accuracy and accurately controls the air flow with respect to the target air flow.
- the present invention provides a ceiling fan that can be operated with substantially the same rotational speed of each ceiling fan even when a plurality of ceiling fans are installed regardless of the distance from the blade to the ceiling. For the purpose.
- the ceiling fan of the present invention includes a blade, a motor that drives the blade, and a control circuit that controls the motor, and is attached to the ceiling via a mounting pole to circulate indoor air. It is a ceiling fan.
- the control circuit also includes an AC / DC converter circuit that converts an AC voltage into a DC voltage, and three arms comprising an upper stage and a lower stage and two switching elements that perform opposite ON / OFF operations connected in series to the DC voltage. Are connected in a three-phase bridge shape, and an inverter circuit is applied to which a voltage orthogonally transformed by the three-phase PWM method is applied to drive the motor.
- the control circuit also includes a shunt resistor inserted for each phase between the lower stage of each phase of the inverter circuit and the negative potential side, an amplifier that amplifies the voltage across the terminals of the shunt resistor, and an output from the amplifier that flows to the motor.
- a current detection unit that detects a current value of each phase.
- the control circuit includes a rotation detection unit that calculates the rotation speed and position of the motor based on the current detected by the current detection unit, calculation of the distance from the blade to the ceiling, and the target airflow and the current output airflow. An air volume calculating unit for comparison.
- control circuit includes a speed control unit that outputs a duty to the inverter circuit to control the rotation speed of the motor so that the air volume is substantially constant based on the comparison result of the air volume calculation unit.
- air volume calculation unit inputs the current value of any one of the current values of each phase detected by the current detection unit and the rotation speed calculated by the rotation detection unit, and from the input current value and rotation speed By calculating the distance from the blade to the ceiling, and setting the current value and the rotation speed that correspond to the target air volume determined based on the calculated distance from the blade to the ceiling, The output air volume is set to the target air volume determined based on the calculated distance from the blade to the ceiling. This achieves the intended purpose.
- the control circuit includes an amplification factor changing unit that changes the amplification factor of the amplifying unit, and the amplification factor changing unit detects a current value input to the air volume calculating unit based on the target air volume.
- the amplification factor of the amplification unit for switching is switched. This achieves the intended purpose.
- the control circuit includes an amplification factor changing unit that changes the amplification factor of the amplification unit, and the amplification factor changing unit is connected to the air volume calculation unit based on the current detected by the current detection unit.
- the amplification factor of the amplification unit for detecting the input current value is switched. This achieves the intended purpose.
- the present invention can accurately detect the current flowing in the motor winding. Therefore, the air volume can be kept substantially constant regardless of the distance from the blade to the ceiling, and an increase in power consumption can be suppressed.
- FIG. 1 is a configuration diagram showing a ceiling fan according to an embodiment of the present invention.
- FIG. 2 is a block diagram showing the configuration of the control circuit of the ceiling fan according to the embodiment of the present invention.
- FIG. 3 is a flowchart showing the operation of the ceiling fan according to the embodiment of the present invention.
- FIG. 4 is a diagram that stores the relationship between the distance from the blades to the ceiling of the ceiling fan according to the embodiment of the present invention, the current, and the rotational speed.
- FIG. 5A is a diagram of a table that stores the set air volume, the target air volume, and the initial rotational speed of the ceiling fan according to the embodiment of the present invention.
- FIG. 5B is a diagram of a table for calculating the distance from the blades to the ceiling of the ceiling fan according to the embodiment of the present invention.
- FIG. 5C is a diagram of a current threshold table for calculating the distance from the blade to the ceiling of the ceiling fan according to the embodiment of the present invention.
- FIG. 6A is a relationship diagram between the distance from the blades to the ceiling, the current, and the rotation speed in the target air volume of the ceiling fan according to the embodiment of the present invention.
- FIG. 6B is a relationship diagram between the blade-to-ceiling distance, the current, and the rotational speed, illustrating the control operation at the target air volume of the ceiling fan according to the embodiment of the present invention.
- FIG. 7 is a block diagram showing a conventional ceiling fan.
- FIG. 8 is a relationship diagram showing the relationship between the blade-to-ceiling distance, the air volume, and the rotation speed in the target air volume of the conventional ceiling fan.
- FIG. 9 is a relationship diagram showing the relationship between the blade-to-ceiling distance, the rotational speed, and the power consumption in the target air volume of the conventional ceiling fan.
- the ceiling fan 1 of the present embodiment is attached to the ceiling in the building.
- the ceiling fan 1 takes advantage of the characteristics of a DC (Direct Current) motor, performs control from a low rotation speed to a high rotation speed, and covers from a small air volume to a large air volume.
- DC Direct Current
- FIG. 1 is a configuration diagram showing a ceiling fan 1 according to an embodiment of the present invention.
- the ceiling fan 1 includes a blade 2, a sensorless brushless DC motor 3, a control circuit 4, a remote controller 5, and a remote control light receiving unit 6.
- the sensorless brushless DC motor 3 rotates the blade 2.
- the remote controller 5 sets the operation of the ceiling fan 1.
- the remote control light receiving unit 6 receives a signal from the remote control 5.
- the remote controller 5 has an operation on / off button 5a for turning on / off the ceiling fan 1, and an air volume setting button 5b for switching the air volume, which are operated by the user.
- the ceiling fan 1 is installed suspended from the ceiling by a mounting pole 7.
- the control circuit 4 drives the sensorless brushless DC motor 3 and rotates the blades 2 attached to the sensorless brushless DC motor 3.
- FIG. 2 is a block diagram showing the configuration of the control circuit 4 of the ceiling fan 1 according to the embodiment of the present invention.
- the AC voltage supplied from the commercial power supply 8 is DC converted by the AC / DC conversion circuit 9.
- the direct-current converted DC voltage is smoothed by the smoothing capacitor 10, and the smoothed direct-current voltage is applied to the inverter circuit 11.
- the inverter circuit 11 includes an upper stage and a lower stage, and three arms formed by connecting two switching elements that perform opposite ON / OFF operations in series with a DC voltage are connected in a three-phase bridge shape, and a three-phase PWM (Pulse)
- the sensorless brushless DC motor 3 is driven by orthogonal transformation by the Width Modulation method.
- the sensorless brushless DC motor 3 includes a stator 12 wound with windings and a rotor 13 provided with a permanent magnet.
- a shunt resistor 14 is inserted for each phase between the lower stage of each phase of the inverter circuit 11 and the negative potential side.
- the amplifying unit 15 amplifies the voltage across the shunt resistor 14 generated by the current flowing through the shunt resistor 14. From the output of the amplification unit 15, the current detection unit 16 detects the current of each phase flowing through the sensorless brushless DC motor 3.
- the rotation detection unit 17 calculates the rotation speed and position of the sensorless brushless DC motor 3 based on the current detected by the current detection unit 16.
- the air volume calculation unit 18 selects the current value of one phase among the current values of each phase detected by the current detection unit 16 and the rotation speed calculated by the rotation detection unit 17 and the target air volume Qs described later. The current value and the rotation speed corresponding to are respectively compared. The air volume calculating unit 18 determines whether the current output air volume is higher or lower than the target air volume Qs based on the comparison result.
- the remote control signal determination unit 19 receives the signal transmitted from the remote control by the remote control light receiving unit 6 by operating the operation on / off button 5a and the air volume setting button 5b of the remote control 5.
- the remote control signal determination unit 19 analyzes the signal from the remote controller 5.
- the remote control signal determination unit 19 obtains the set air volume from the analysis result, and outputs the target air volume Qs to the target air volume calculator 20.
- the target air volume calculation unit 20 uses the current value of each phase detected by the current detection unit 16 and the rotation number calculated by the rotation detection unit 17 from the blade 2. Calculate the distance to the ceiling. Based on the calculated distance from the blade 2 to the ceiling, the target air volume calculation unit 20 calculates the determined target air volume Qs and instructs the air volume calculation unit 18 of the target air volume Qs.
- the amplification factor changing unit 21 receives the target air volume Qs calculated by the target air volume calculating unit 20, and changes the amplification factor of the amplifying unit 15 of a predetermined phase according to the magnitude of the target air volume Qs.
- the speed control unit 22 outputs a duty to the inverter circuit 11 to vary the rotation speed of the sensorless brushless DC motor 3.
- FIG. 3 is a flowchart showing the operation of the ceiling fan 1 according to the embodiment of the present invention.
- the user In order to start the operation of the ceiling fan 1, the user operates the operation on / off button 5a of the remote controller 5 to start the operation of the ceiling fan 1. Thereafter, the air volume setting button 5b is operated to set the air volume setting to, for example, a strong notch. Then, the remote control signal determination unit 19 analyzes the signal from the remote controller 5, obtains the set air volume from the analysis result, and obtains the target air volume Qs.
- the method for determining the target air volume Qs may refer to, for example, a table stored in a memory or may be based on a preset calculation formula.
- the target air volume calculator 20 determines whether the distance from the blade 2 to the ceiling can be determined (step S101). A case where the distance from the blade 2 to the ceiling cannot be determined (NO in step S101) will be described. When the distance from the blade 2 to the ceiling cannot be determined, for example, an initial rotational speed corresponding to the target air volume Qs is determined from a table stored in a memory as shown in FIG. 5A described later (step S102). The speed control unit 22 outputs a duty to the inverter circuit 11.
- the inverter circuit 11 When the duty is output to the inverter circuit 11, the inverter circuit 11 sequentially turns on the six switching elements to drive the sensorless brushless DC motor 3.
- a current flows through the shunt resistor 14.
- the amplifying unit 15 amplifies the voltage at both ends of each shunt resistor 14.
- the current detector 16 detects the voltage across each of the amplified shunt resistors 14 and detects the current (winding current) flowing through the winding of the sensorless brushless DC motor 3 for each phase based on this potential ( Step S103). Two phases of the detected winding current are input to the rotation detector 17.
- the winding current for the remaining one phase is input to the air volume calculation unit 18.
- the rotation detector 17 detects the rotation speed and position of the sensorless brushless DC motor 3 from the winding currents for two phases (step S104).
- the air volume calculation unit 18 compares the initial rotation speed determined by the target air volume calculation unit 20 with the rotation speed detected by the rotation detection unit 17, that is, the current rotation speed (step S105).
- the air volume calculation unit 18 instructs the speed control unit 22 to output a large duty. Is performed (step S106).
- the air volume calculation unit 18 instructs the speed control unit 22 to output a small duty (step S106).
- the air volume calculation unit 18 calculates the current value for one phase detected by the current detection unit 16 and the rotational speed detected by the rotation detection unit 17 from The distance from the blade 2 to the ceiling is calculated.
- the method for calculating the distance from the blade 2 to the ceiling may be determined with reference to a table stored in the memory, or may be based on a preset calculation formula.
- FIG. 4 is a diagram that stores the relationship between the distance from the blade 2 to the ceiling of the ceiling fan according to the embodiment of the present invention, the current, and the rotational speed.
- FIG. 5A is a diagram of a table storing the set air volume, the target air volume Qs, and the initial rotational speed of the ceiling fan.
- FIG. 5B is a diagram of a table for calculating the distance from the blade 2 of the ceiling fan to the ceiling.
- FIG. 5C is a current threshold table for calculating the distance from the blade 2 to the ceiling of the ceiling fan.
- the relationship between the target air volume Qs with respect to the set air volume (that is, the air volume notch) and the initial rotational speed with respect to the target air volume Qs is shown in FIG. 5A. This relationship is stored in a table.
- the air volume setting is set to a strong notch will be described.
- the target air volume Qs is 284 m 3 / min, and the initial rotational speed is 230 r / min.
- the ceiling fan 1 is operated at a constant initial rotational speed of 230 r / min at a plurality of distances from the blades 2 to the ceiling, and the distance from the blades 2 to the ceiling at that time, the rotational speed of the blades and the current detection unit 16 are detected. Measure the current value for one phase. The measurement results are shown in FIG.
- This measurement result that is, the relationship between the distance from the blade 2 to the ceiling and the current value at the initial rotation speed of 230 r / min is tabulated (FIGS. 5B and 5C) and stored in the memory.
- the distance from the ceiling fan 1 attached to the ceiling to the blades 2 to the ceiling is calculated.
- the attached ceiling fan 1 is operated at an initial rotational speed of 230 r / min.
- the current detection unit 16 detects the current value for one phase flowing through the sensorless brushless DC motor 3 at that time. From the current value for one phase, the distance from the blade 2 to the ceiling is calculated based on the table shown in FIG. 5B. For example, when the detected current value for one phase is 260 mA, the range of current symbols I2 to I3 is selected from FIG. 5C, and the distance from the blade 2 to the ceiling is 250 mm from the table shown in FIG. 5B ( Step S107).
- the distance determination completion is set, and the fact that the distance from the blade 2 to the ceiling has been calculated is stored (step S108).
- the target air volume Qs for the strong notch is determined and instructed to the air volume computing unit 18 (step S109).
- the method for determining the target air volume Qs may be determined with reference to a table stored in the memory, or may be based on a preset calculation formula.
- the amplification factor of any one of the three phases is changed by the amplification factor changing unit 21 in accordance with the target air volume Qs (step S110).
- the amplification factor changing unit 21 performs a process of increasing the amplification factor of the amplifying unit 15 for detecting the current value input to the air volume calculating unit 18.
- the predetermined air volume Qa is an air volume value stored in advance. The predetermined air volume Qa is set to a value that is sufficiently small with respect to the target air volume Qs and that the current detection unit 16 cannot accurately detect the winding current unless the amplification factor is switched and detected.
- the speed control unit 22 outputs a duty to the inverter circuit 11 based on the value determined by the target air volume Qs.
- the inverter circuit 11 When the duty is output to the inverter circuit 11, the inverter circuit 11 conducts the six switching elements in order, and drives the sensorless brushless DC motor 3. When the sensorless brushless DC motor 3 is driven, a current flows through the shunt resistor 14.
- the amplifying unit 15 amplifies the voltage across each shunt resistor 14.
- the current detection unit 16 detects the voltage at both ends of each amplified shunt resistor 14, and detects the current (winding current) flowing through the sensorless brushless DC motor winding for each phase based on this voltage (step S111). .
- the current detection unit 16 inputs a winding current for two phases among the detected winding currents to the rotation detection unit 17.
- the winding current for the remaining one phase is input to the air volume calculation unit 18 as will be described later.
- the rotation detection unit 17 calculates the rotation speed and position of the sensorless brushless DC motor 3 from the winding currents for two phases (step S112).
- the air volume calculation unit 18 calculates the current output air volume Qn from the current value for one phase detected by the current detection unit 16 and the rotation speed detected by the rotation detection unit 17 (step S113).
- FIG. 6A is a relationship diagram between the distance from the blade 2 to the ceiling, the current, and the rotation speed in the target air volume Qs of the ceiling fan 1 according to the embodiment of the present invention. From FIG. 6A, the rotational speed and the current value are obtained based on the target air volume Qs and the distance from the blade 2 to the ceiling.
- the distance from the blade 2 to the ceiling obtained in step S107 is 250 mm.
- the relationship between the rotational speed and current when the distance from the blade 2 to the ceiling is 250 mm in the target air volume Qs is as shown in FIG. 6B.
- FIG. 6B is a relationship diagram between the distance from the blade 2 to the ceiling, the current, and the rotational speed, illustrating the control operation at the target air volume of the ceiling fan 1 according to the embodiment of the present invention.
- the operating state that satisfies the target air volume Qs is the rotation speed N1 and the current I1.
- the current output air volume Qn with respect to the target air volume Qs is The air volume is low.
- the current output air volume Qn is in a state where the air volume is larger than the target air volume Qs. .
- the current output air volume Qn is equal to the target air volume Qs.
- the air volume calculating unit 18 compares the calculated output air volume Qn with the target air volume Qs (step S114).
- the air volume calculation unit 18 instructs the speed control unit 22 to output a large duty, and controls to increase the rotational speed.
- the air volume calculating unit 18 instructs the speed control unit 22 to output a small duty. Accordingly, the rotational speed of the blade 2 is controlled to be lowered, and the deviation between the output air volume Qn and the target air volume Qs is controlled to be small.
- the shunt resistor 14 is inserted between the lower stage of each phase of the inverter circuit 11 and the negative potential side of the current flowing through the sensorless brushless DC motor 3, and flows through the shunt resistor 14.
- the winding current can be detected with high accuracy.
- the winding current can be accurately detected by changing the amplification factor of any one of the phases by the amplification factor changing unit 21. Therefore, it is possible to operate from a small air volume to a large air volume utilizing the characteristics of the DC motor. Therefore, the air volume can be kept substantially constant regardless of the distance from the blades 2 to the ceiling, and an increase in power consumption due to excessive air volume can be suppressed.
- the amplification factor changing unit 21 is configured to switch the amplification factor corresponding to the target air volume Qs.
- the amplification factor may be switched based on the current value detected by the current detection unit 16. .
- the ceiling fan 1 includes the blade 2, the motor corresponding to the sensorless brushless DC motor 3 that drives the blade 2, and the control circuit 4 that controls the motor, via the mounting pole. It is mounted on the ceiling and circulates indoor air.
- the control circuit 4 includes an AC / DC conversion circuit 9 that converts an AC voltage into a DC voltage, and two switching elements that are composed of an upper stage and a lower stage and perform opposite ON / OFF operations in series with the DC voltage.
- An inverter circuit 11 is provided that connects two arms in a three-phase bridge shape and is applied with a voltage orthogonally converted by a three-phase PWM method to drive a motor.
- control circuit 4 includes a shunt resistor 14 inserted for each phase between the lower stage of each phase of the inverter circuit 11 and the negative potential side, an amplifying unit 15 that amplifies the voltage across the terminals of the shunt resistor 14, and an amplifying unit 15. And a current detector 16 for detecting the current value of each phase flowing to the motor from the output.
- the control circuit 4 also includes a rotation detection unit 17 that calculates the rotation speed and position of the motor based on the current detected by the current detection unit 16, calculation of the distance from the blades to the ceiling, target air volume, and current output.
- An air volume calculating unit 18 for comparing with the air volume is provided.
- control circuit 4 outputs a duty to the inverter circuit 11 to control the rotational speed of the motor so that the air volume is substantially constant based on the comparison result of the air volume calculator 18. 22.
- the air volume calculation unit 18 inputs the current value of any one of the current values of each phase detected by the current detection unit 16 and the rotation speed calculated by the rotation detection unit 17, and inputs the input current value and Calculate the distance from the blade to the ceiling from the rotation speed, and set the current value and rotation speed that correspond to the target air volume determined based on the calculated distance from the blade to the ceiling.
- the current output air volume is set to the target air volume determined based on the calculated distance from the blade to the ceiling.
- control circuit 4 may include an amplification factor changing unit 21 that changes the amplification factor of the amplification unit 15.
- the amplification factor changing unit 21 may switch the amplification factor of the amplification unit 15 for detecting the current value input to the air volume calculating unit 18 based on the target air volume.
- the size of the amplification factor changing unit 21 can be changed according to the target air volume, and the current flowing through the motor winding can be accurately detected. Even when the target air volume is small, the ventilation air volume is always constant. Can be kept in.
- control circuit 4 may include an amplification factor changing unit 21 that changes the amplification factor of the amplification unit 15.
- the amplification factor changing unit 21 may switch the amplification factor of the amplification unit 15 for detecting the current value input to the air volume calculation unit 18 based on the current detected by the current detection unit 16.
- the size of the amplification changing unit 21 can be changed according to the current detected by the current detecting unit 16, and the current flowing through the motor winding can be accurately detected. Even when the target air volume is small, The air volume can be kept substantially constant.
- the ceiling fan according to the present invention is attached to the ceiling via a mounting pole to circulate indoor air. Even if the blade diameter is large, it is widely useful in products that can obtain a predetermined air volume regardless of the distance from the blade to the ceiling.
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- Mechanical Engineering (AREA)
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- Control Of Motors That Do Not Use Commutators (AREA)
- Control Of Positive-Displacement Air Blowers (AREA)
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Abstract
Description
羽根径が一定であれば、風量は回転数に比例する。しかし、取付ポールの長さを変えて、天井から近接した状態で設置された場合と、ある程度天井から離れた状態で設置された場合とでは、同じ回転数であっても羽根の仕事量の増減によって、風量が変わる。
2 羽根
3 センサレスブラシレスDCモータ
4 制御回路
5 リモコン
5a 運転入/切ボタン
5b 風量設定ボタン
6 リモコン受光部
7 取付ポール
8 商用電源
9 交直変換回路
10 平滑コンデンサ
11 インバータ回路
12 固定子
13 回転子
14 シャント抵抗
15 増幅部
16 電流検出部
17 回転検出部
18 風量演算部
19 リモコン信号判断部
20 目標風量演算部
21 増幅率変更部
22 速度制御部
Claims (3)
- 羽根と、前記羽根を駆動するモータと、前記モータを制御する制御回路を備え、
取付ポールを介して天井に取り付けられ、室内の空気を循環させる天井扇風機であって、
前記制御回路は、
交流電圧を直流電圧に変換する交直変換回路と、
上段と下段からなり、相反するON/OFF動作を行う2つのスイッチング素子を前記直流電圧に直列に接続して成る三つのアームを三相ブリッジ状に結線し、かつ、三相PWM方式により直交変換された電圧が印加され、前記モータを駆動するインバータ回路と、
前記インバータ回路の各相の下段と負電位側の間に相ごとに挿入したシャント抵抗と、
前記シャント抵抗の端子間電圧を増幅する増幅部と、
前記増幅部の出力から前記モータに流れる各相の電流値を検出する電流検出部と、
前記電流検出部で検出された電流に基づいて前記モータの回転数と位置を算出する回転検出部と、
前記羽根から前記天井までの距離の算出と、目標風量と現在の出力風量との比較を行う風量演算部と、
前記風量演算部の比較結果に基づいて、風量が実質的に一定となるように、前記インバータ回路に対してデューティを出力して前記モータの回転数を制御する速度制御部とを備え、
前記風量演算部は、
前記電流検出部で検出した各相の電流値のうちいずれか1相の電流値と、前記回転検出部が算出した回転数とを入力し、
入力した前記電流値および前記回転数から前記羽根から前記天井までの前記距離を算出し、
前記入力した前記電流値および前記回転数を、前記算出した前記羽根から前記天井までの前記距離に基づいて決定された前記目標風量に対応する電流値および回転数を設定することによって、前記現在の前記出力風量を算出した前記羽根から前記天井までの前記距離に基づいて決定された前記目標風量に設定する天井扇風機。 - 前記制御回路は、前記増幅部の増幅率を変更する増幅率変更部を備え、
前記増幅率変更部は、前記目標風量に基づいて前記風量演算部に入力する電流値を検出するための前記増幅部の増幅率を切り替える請求項1記載の天井扇風機。 - 前記制御回路は、前記増幅部の増幅率を変更する増幅率変更部を備え、
前記増幅率変更部は、前記電流検出部が検出する電流に基づいて、前記風量演算部に入力する電流値を検出するための前記増幅部の増幅率を切り替える請求項1記載の天井扇風機。
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CN110501604A (zh) * | 2019-08-22 | 2019-11-26 | 江苏春博电子科技有限公司 | 一种有刷直流风机开路故障的检测装置及其检测方法 |
WO2020021943A1 (ja) * | 2018-07-27 | 2020-01-30 | パナソニックIpマネジメント株式会社 | 天井扇風機 |
TWI742984B (zh) * | 2021-01-12 | 2021-10-11 | 林明毅 | 電風扇風速控制結構 |
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JP2003269385A (ja) * | 2002-03-14 | 2003-09-25 | Mitsubishi Electric Corp | 送風機 |
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JP2010138865A (ja) * | 2008-12-15 | 2010-06-24 | Panasonic Corp | シーリングファン |
JP2013189953A (ja) * | 2012-03-15 | 2013-09-26 | Panasonic Corp | 天井扇風機 |
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JP2003269385A (ja) * | 2002-03-14 | 2003-09-25 | Mitsubishi Electric Corp | 送風機 |
JP2009072735A (ja) * | 2007-09-24 | 2009-04-09 | Sharp Corp | 送風装置 |
JP2010138865A (ja) * | 2008-12-15 | 2010-06-24 | Panasonic Corp | シーリングファン |
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JPWO2020021943A1 (ja) * | 2018-07-27 | 2021-08-02 | パナソニックIpマネジメント株式会社 | 天井扇風機 |
JP7336638B2 (ja) | 2018-07-27 | 2023-09-01 | パナソニックIpマネジメント株式会社 | 天井扇風機 |
CN110501604A (zh) * | 2019-08-22 | 2019-11-26 | 江苏春博电子科技有限公司 | 一种有刷直流风机开路故障的检测装置及其检测方法 |
TWI742984B (zh) * | 2021-01-12 | 2021-10-11 | 林明毅 | 電風扇風速控制結構 |
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