JP4888404B2 - Blower and electric device equipped with the same - Google Patents

Description

  The present invention mainly relates to a ventilator for exhaust and air supply such as a ceiling-embedded type, a blower mounted on a range hood, a humidifier, a dehumidifier, a refrigeration apparatus, an air conditioner, a water heater, and the blower It is related with the electric equipment which carries.

  In recent years, in air blowers installed in electrical equipment such as ventilators, pressure loss due to duct piping configuration, pressure loss due to external air pressure, clogging of filters, etc., after reducing cost, increasing efficiency and reducing noise There is a need for an air blower with good controllability that can be ventilated with a constant air volume according to the situation of the living room without being affected by changes in the room.

  Conventionally, the thing of the structure disclosed by patent document 1 is known for this kind of air blower.

  Hereinafter, the blower will be described with reference to FIG.

As shown in the figure, the blower 110 has a built-in centrifugal blower 110 a, and the centrifugal blower 110 a is driven by a brushless DC motor 111. The DC voltage control means 108 is a step-down chopper circuit that converts a high voltage including ripple after full-wave rectification of a commercial AC power supply into a DC voltage of 45 V or less. The supply current value control means 122 is connected to the current detection means 121. The output voltage of the DC voltage control means 108 is controlled by controlling the DC voltage value changing means 114 so that the average current value detected by the inverter circuit 106 is equal to the current value indicated by the current value indicating means 119. Feedback control while changing The air volume control means 132 has a configuration of the blower 110 that changes the current supplied to the inverter circuit 106 with respect to the reference set value according to the output voltage of the DC voltage control means 108 and instructs the current value instruction means 119.
Japanese Patent Application Laid-Open No. 2007-100574

  According to such a conventional air blower, from the viewpoint of cold draft, etc., when it is mounted on a ventilator or the like in which it is desired to reduce the air flow even if the air flow is constant in winter compared with summer, There is a problem that the air volume and the air volume during winter cannot be changed, and it is easy to adjust the specifications such as the air volume-static pressure characteristics and multiple air volume settings without increasing the required circuit space, and the change in ambient temperature It is required that the air flow rate can be controlled in accordance with the above.

  The present invention solves such a conventional problem, and simplifies specification adjustment, reduces the size and quality of the circuit, is not affected by fluctuations in the supplied power voltage, and has a static pressure such as pressure loss. Even if the air flow changes, the air flow-static pressure characteristics are highly accurate, and according to the change in the ambient temperature, the air flow is increased if the ambient temperature is high. The object of the present invention is to provide a blower that can reduce the amount of blown air when the airflow is low.

In order to achieve the above object, the blower of the present invention includes a centrifugal blower mounted with a brushless DC motor, an inverter circuit composed of an upper stage and a lower stage, and bridge-connected with a plurality of switching elements, respectively, and applied to the inverter circuit. PWM control is performed on the upper or lower stage of the switching element for the DC voltage to be driven, and the drive logic control means for sequentially energizing the driving coil of the brushless DC motor in a predetermined direction and order, and PWM for the switching element By changing the output of the duty instruction voltage generating means, which is an instruction voltage for instructing the ON / OFF duty at the time of control, and changing the output of the duty instruction voltage generating means, the ON / OFF duty of the PWM control of the switching element can be varied. The average current supplied to the inverter circuit is substantially constant. Supply current value control means for controlling and current value instruction means for instructing an average current value controlled substantially constant by the supply current value control means, and when the duty instruction voltage generation means indicates a predetermined voltage The current value indicated by the current value indicating means is set as a reference current value, and the reference current value indicating means for indicating the reference current value, the ambient temperature detecting means for detecting the ambient temperature, and the duty indicating voltage generating means In accordance with the voltage value of the generated DC voltage, the correlation instruction means for instructing the correlation with the average current value instructed by the current value instruction means, and the ambient temperature detected by the ambient temperature detection means, A temperature correction unit that changes the reference current value, and the correlation instruction unit changes the current value linearly or nonlinearly with respect to the reference current value. An average current value indicated by an indicating means is determined, and the temperature correcting means increases the reference current value when the ambient temperature is higher than the reference temperature, and increases the reference current value when the ambient temperature is lower than the reference temperature. The air volume-static pressure characteristics, in which the air volume does not change significantly even if the pressure loss changes by reducing the current value , is such that the air volume increases when the ambient temperature is high and decreases when the ambient temperature is low. It is set as the structure of an air blower.

  By this means, the reference current value instructing means instructs the reference current value instructed by the current value instructing means when the DC voltage generated by the duty instructing voltage generating means is a predetermined voltage. If the ambient temperature detected by the ambient temperature detection means is higher than the reference temperature, the temperature correction means increases the reference current value indicated by the reference current value indication means, and the detected ambient temperature is lower than the reference temperature. In this case, the reference current value indicated by the temperature correction means by the reference current value instruction means is lowered. Therefore, expansion of circuit space can be suppressed and quality can be improved. Further, in the rotational speed-torque characteristics in which the shaft torque increases further as the rotational speed increases, the shaft torque increases as the ambient temperature increases, and the shaft torque decreases as the ambient temperature decreases. An air blower and an electrical device capable of realizing an air flow-static pressure characteristic in which the air flow is increased if the ambient temperature is lowered and the air flow is reduced if the ambient temperature is lowered and the air flow does not greatly change even if the static pressure such as pressure loss is changed. can get.

  In order to achieve the above object, the air blower of the present invention comprises a DC voltage control means formed by a chopper circuit that controls the voltage value of the DC voltage applied to the inverter circuit to be constant. It is set as the structure of an air blower.

  By this means, even if the power supply voltage supplied to the air blower main body fluctuates, the voltage applied to the inverter circuit by the DC voltage control means becomes a constant voltage, so that it is applied to the drive coil of the brushless DC motor. The correlation between the equivalent voltage and the current flowing through the drive coil does not change, and the rotation speed-torque characteristic of the brushless DC motor does not change. Therefore, since the fluctuation of the air volume of the blower is also suppressed, a blower and an electric device that can realize stable and constant air volume control can be obtained.

  Further, in order to achieve the above object, the blower of the present invention has an applied voltage detecting means for detecting a voltage value of a DC voltage applied to the inverter circuit, a voltage value detected by the applied voltage detecting means and a reference voltage. And a reference current value correcting means for correcting the reference current value indicated by the reference current value indicating means according to the difference.

By this means, even if the power supply voltage supplied to the blower main body fluctuates, the applied voltage detection means detects the DC voltage applied to the inverter circuit, and the difference between the detected voltage value and the reference voltage If the detected voltage is lower than the reference voltage, the reference current value correcting means lowers the reference current value indicated by the reference current value indicating means, and conversely, the detected voltage is lower than the reference voltage. Is higher, the reference current value indicated by the reference current value indicating means is increased. Therefore, the correlation between the equivalent voltage applied to the drive coil of the brushless DC motor and the current flowing through the drive coil does not change, the rotation speed-torque characteristic of the brushless DC motor does not change, and the air volume of the blower also changes. As a result, it is possible to obtain an air blower and an electric device that can realize stable and constant air flow control.

  In order to achieve the above object, the air blower of the present invention has a change amount that the correlation instruction means changes with respect to the reference current value instructed by the reference current value instruction means according to the magnitude of the resistance value to be connected. It is set as the structure of the air blower characterized by determining these.

  By this means, the air flow-static pressure characteristics can be adjusted by changing the resistance value of the resistance connected to the correlation indicating means, so that the man-hours required for specification adjustment can be greatly reduced and the standardization of the motor can be made possible. A blower and electrical equipment are obtained.

  In order to achieve the above object, the air blower of the present invention has a structure of the air blower characterized in that the reference current value indicating means determines the reference current value to be instructed according to the magnitude of the resistance value to be connected. It is.

  By this means, since the air volume can be adjusted by changing the resistance value of the resistor connected to the reference current value indicating means, the man-hour required for adjusting the specifications can be greatly reduced, and the blower device and the electric device capable of standardizing the motor can be achieved. Equipment is obtained.

  In order to achieve the above object, the air blower is characterized in that the temperature correction means determines the amount of change for changing the reference current value according to the difference from the reference temperature according to the magnitude of the connected resistance value. It is set as the structure of an air blower.

  By this means, it is possible to adjust the air volume when the ambient temperature changes by changing the resistance value of the resistor connected to the temperature correction means. Therefore, it is possible to significantly reduce the man-hours required for adjusting the specifications and to enable standardization of the motor. Devices and electrical equipment are obtained.

  Further, in order to achieve the above object, the air blower of the present invention comprises air volume instruction means and reference current value instruction change means for changing a resistance value connected to the reference current value instruction means, and the air flow instruction means indicates According to the state, the reference current value instruction changing unit changes the resistance value connected to the reference current value indicating unit, and the blower is configured.

  By this means, since the air volume adjustment according to the air volume instruction of the air volume instruction means can be performed by changing the resistance value of the resistor connected to the reference current value instruction means, the man-hours required for adjusting the specifications such as speed adjustment can be greatly reduced. At the same time, a blower and an electric device that can standardize the motor are obtained.

  In order to achieve the above object, the air blower of the present invention is provided with correlation changing means for changing a resistance value connected to the correlation indicating means, and the correlation changing means is configured to change the resistance according to the instruction state of the air volume indicating means. It is set as the structure of the air blower characterized by changing the resistance value connected to a correlation instruction | indication means.

  By this means, by adjusting the resistance value of the resistor connected to the correlation indicating means, the air volume-static pressure characteristics corresponding to the speed setting such as strong and weak can be adjusted, so the man-hour required for the specification adjustment can be greatly reduced. In addition, a blower and an electric device that can standardize the motor can be obtained.

  In order to achieve the above object, the air blower of the present invention is provided with a plurality of AC power supply connecting means for connecting an AC power supply, and an instruction is given by the reference current value indicating means according to the connection location to the AC power supply connecting means. A supply current set value changing means for changing the reference current value to be provided is provided.

  By this means, the supply current set value changing means changes the reference current value indicated by the reference current value indicating means in accordance with the connection location to the AC power supply connecting means, so that the air volume can be adjusted such as strong and weak. Thus, it is possible to obtain a blower and an electric device that can greatly reduce the man-hours required for adjusting the specifications such as speed adjustment and can standardize the motor.

  Further, the drive logic control means supplies a current without a non-energized section to the drive coil, and is configured as a blower device.

  By this means, the ripple of the current supplied to the inverter circuit is greatly reduced and the torque ripple of the motor is reduced, so that a blower and an electric device that achieves high airflow accuracy and low vibration can be obtained. .

  According to the present invention, when the ambient temperature detected by the ambient temperature detecting means is higher than the reference temperature, the temperature correction means increases the reference current value indicated by the reference current value indicating means, and the detected ambient temperature is When the temperature is lower than the reference temperature, the reference current value indicated by the reference current value indicating means is lowered, so that the circuit space can be suppressed and the quality can be improved, and the shaft torque further increases as the rotational speed increases. In the increasing rotational speed-torque characteristics, the shaft torque increases as the ambient temperature increases, and decreases as the ambient temperature decreases. Therefore, the air volume increases as the ambient temperature increases, and the air volume decreases as the ambient temperature decreases, and an air volume-static pressure characteristic in which the air volume does not change greatly even if the static pressure such as pressure loss changes can be realized. Blowers and electrical equipment can be provided.

  Further, according to the present invention, since the DC voltage control means makes the voltage applied to the inverter circuit constant, the correlation between the equivalent voltage applied to the drive coil of the brushless DC motor and the current flowing through the drive coil does not change. . Therefore, even if fluctuations occur in the power supply voltage supplied to the blower main body, there is no fluctuation in the rotational speed-torque characteristics of the brushless DC motor, and the blower that can realize stable and constant airflow control in which the airflow fluctuation of the blower is suppressed. Equipment and electrical equipment can be provided.

Further, according to the present invention, the applied voltage detecting means detects a DC voltage applied to the inverter circuit, and the reference current value correcting means detects the difference between the detected voltage value and the reference voltage. If the voltage is lower than the reference voltage, the reference current value indicated by the reference current value indicating means is lowered. Conversely, if the detected voltage is higher than the reference voltage, the reference current value indicating means is used. Increase the indicated reference current value. For this reason, even if fluctuations occur in the power supply voltage supplied to the blower body, there is no fluctuation in the rotational speed-torque characteristics of the brushless DC motor, and fluctuations in the airflow of the blower are also suppressed, realizing stable and constant airflow control. Can be provided.

  In addition, according to the present invention, since the air volume-static pressure characteristics can be adjusted by changing the resistance value of the resistor connected to the correlation indicating means, the man-hours required for the specification adjustment can be greatly reduced and the standardization of the motor can be realized. Can be provided.

  Further, according to the present invention, since the air volume can be adjusted by changing the resistance value of the resistor connected to the reference current value indicating means, the air blower capable of realizing a significant reduction in man-hours required for the specification adjustment and the standardization of the motor, and Electric equipment can be provided.

  Further, according to the present invention, since the air volume can be adjusted when the ambient temperature changes by changing the resistance value of the resistor connected to the temperature correction means, the man-hour required for adjusting the specifications can be greatly reduced and the motor can be standardized. Blowers and electrical equipment can be provided.

  Further, according to the present invention, since the air volume adjustment according to the air volume instruction of the air volume instruction means can be performed by changing the resistance value of the resistor connected to the reference current value instruction means, the man-hour required for the specification adjustment such as the speed adjustment is greatly increased. And a blower and electrical equipment that can realize standardization and motor standardization.

  Further, according to the present invention, by adjusting the resistance value of the resistor connected to the correlation instruction means, the air volume-static pressure characteristics corresponding to the speed setting such as strong and weak can be adjusted. It is possible to provide a blower and an electric device that can realize a substantial reduction and standardization of a motor.

  Further, according to the present invention, the supply current set value changing means changes the reference current value indicated by the reference current value indicating means according to the connection location to the AC power supply connecting means. Since the adjustment can be performed, it is possible to significantly reduce the man-hours required for adjusting the specifications such as the speed adjustment, and it is possible to provide an air blower and an electric device that can realize standardization of the motor.

  In addition, according to the present invention, since the ripple of the current supplied to the inverter circuit is significantly reduced and the torque ripple of the motor is reduced, the air blowing device and the electric device that can realize high accuracy of air flow and low vibration. Equipment can be provided.

The invention according to claim 1 of the present invention includes a centrifugal blower equipped with a brushless DC motor, an inverter circuit composed of an upper stage and a lower stage, each bridge-connected by a plurality of switching elements, and a direct current applied to the inverter circuit. When the voltage is PWM controlled at the upper or lower stage of the switching element, and the drive logic control means for sequentially energizing the driving coil of the brushless DC motor in a predetermined direction and order, and PWM control of the switching element Duty instruction voltage generating means for indicating the ON / OFF duty of the inverter, and changing the output of the duty instruction voltage generating means to vary the ON / OFF duty of the PWM control of the switching element to change the inverter circuit Supply voltage that controls the average current supplied to the Value control means and current value instruction means for instructing an average current value controlled substantially constant by the supply current value control means, and when the duty instruction voltage generation means indicates a predetermined voltage, the current value The current value indicated by the indicating means is set as a reference current value, the reference current value indicating means for indicating the reference current value, the ambient temperature detecting means for detecting the ambient temperature, and the DC voltage generated by the duty indicating voltage generating means Correlation indicating means for indicating a correlation with the average current value indicated by the current value indicating means according to the voltage value of the reference current value, and the reference current value according to the ambient temperature detected by the ambient temperature detecting means Temperature correction means for changing the reference current value, and the correlation indicating means changes linearly or non-linearly with respect to the reference current value, and the current value indicating means An average current value to be instructed is determined, and the temperature correction means increases the reference current value when the ambient temperature is higher than the reference temperature, and sets the reference current value when the ambient temperature is lower than the reference temperature. The air volume-static pressure characteristics, where the air volume does not change greatly even if the pressure loss changes, is such that the air volume increases when the ambient temperature is high, and the air volume decreases when the ambient temperature is low . The reference current value indicating means instructs the reference current value indicated by the current value indicating means when the DC voltage generated by the duty indicating voltage generating means is a predetermined voltage, and the temperature correcting means detects the atmosphere detected by the ambient temperature detecting means. When the temperature is higher than the reference temperature, the reference current value indicated by the reference current value indicating means is increased. When the detected ambient temperature is lower than the reference temperature, the reference current value indicating means is specified. Since the reference current value shown is lowered, the shaft torque of the brushless DC motor increases when the ambient temperature increases, and the shaft torque of the brushless DC motor decreases when the ambient temperature decreases.

  The invention described in claim 2 has a structure of an air blower comprising a DC voltage control means formed by a chopper circuit for controlling the voltage value of the DC voltage applied to the inverter circuit to be constant. By making the voltage applied to the inverter circuit constant, the correlation between the equivalent voltage applied to the drive coil of the brushless DC motor and the current flowing through the drive coil does not change, and the rotational speed of the brushless DC motor -The torque characteristic does not change.

  According to the third aspect of the present invention, the applied voltage detecting means for detecting the voltage value of the DC voltage applied to the inverter circuit, and the difference between the voltage value detected by the applied voltage detecting means and the reference voltage, The blower is configured to include a reference current value correcting unit that corrects a reference current value instructed by the reference current value indicating unit, and is equivalent to being applied to a drive coil of a brushless DC motor. The correlation between the voltage and the current flowing through the drive coil does not change, and the rotation speed-torque characteristic of the brushless DC motor does not change.

  According to a fourth aspect of the present invention, the correlation indicating means determines a change amount to be changed with respect to the reference current value instructed by the reference current value indicating means, according to the magnitude of the connected resistance value. It has the effect of adjusting the air flow-static pressure characteristics by changing the resistance value of the resistor connected to the correlation indicating means.

  According to a fifth aspect of the present invention, the reference current value indicating means determines the reference current value to be indicated according to the magnitude of the resistance value to be connected. The air volume can be adjusted by changing the resistance value of the resistor connected to the means.

  According to a sixth aspect of the present invention, the temperature correction means determines the amount of change for changing the reference current value according to the difference from the reference temperature according to the magnitude of the resistance value to be connected. It has the effect that the air volume can be adjusted when the ambient temperature changes by changing the resistance value of the resistor connected to the temperature correction means.

  The invention according to claim 7 includes an air volume instruction means and a reference current value instruction change means for changing a resistance value connected to the reference current value instruction means, and the reference current value according to an instruction state of the air volume instruction means. The instruction changing unit is configured to change the resistance value connected to the reference current value indicating unit, and the air flow rate is changed by changing the resistance value of the resistor connected to the reference current value indicating unit. The air volume can be adjusted according to the air volume instruction of the instruction means.

  According to an eighth aspect of the present invention, there is provided correlation changing means for changing a resistance value connected to the correlation instruction means, and the correlation changing means is connected to the correlation instruction means according to an instruction state of the air volume instruction means. The air blower is configured to change the resistance value, and the air flow-static pressure characteristics corresponding to the speed setting such as strong and weak by changing the resistance value of the resistance connected to the correlation indicating means. It has the effect | action that can be adjusted.

  The invention according to claim 9 is provided with a plurality of AC power supply connecting means for connecting an AC power supply, and changes the reference current value indicated by the reference current value indicating means according to the connection location to the AC power supply connecting means. According to the present invention, the supply current set value change means is provided, and the supply current set value change means serves as a reference current value instruction means according to the connection location to the AC power supply connection means. Since the reference current value instructed is changed, the air volume can be adjusted such as strong and weak.

  According to a tenth aspect of the present invention, there is provided a blower configuration in which the drive logic control means supplies a current having no non-energized section to the drive coil, and the ripple of the current supplied to the inverter circuit is provided. Is greatly reduced, and the torque ripple of the motor is reduced.

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

(Embodiment 1)
As shown in FIGS. 1 to 5, reference numeral 10 denotes a blower device including a centrifugal blower 10 a on which a brushless DC motor 11 is mounted, and is connected to an external power source. Reference numeral 1 denotes a ventilator incorporating a blower 10. Dirty indoor air that is sucked in by the blower 10 and is generated by cooking or the like passes through the wall of the building through the outlet of the ventilator 1 and the duct 24 and is discharged to the outside. The magnet rotor 3 of the brushless DC motor 11 is formed by integrally orienting a plastic magnet with a shaft by polar orientation during injection molding, and the main magnetic pole portion is a polar anisotropic magnet. The outer cover of the brushless DC motor 11 is molded with a filler such as calcium carbonate or aluminum hydroxide and a resin such as unsaturated polyester containing glass fiber, and detects the magnetic pole position and magnetic flux density distribution of the magnet rotor 3. Hall element (magnetic flux density distribution detection means 4) serving as magnetic pole position detection means, inverter circuit 6 in which upper switching elements Q1, Q3, Q5 and lower switching elements Q2, Q4, Q6 are bridge-connected, and Hall element (magnetic flux) A drive logic control means 5 for controlling ON / OFF of the switching elements Q1 to Q6 so that the drive coil 2 is sequentially full-wave energized in a predetermined direction and order based on the output of the density distribution detection means 4); A PWM control means 23 for PWM controlling the elements Q2, Q4, Q6 is incorporated. Here, since the main magnetic pole portion of the magnet rotor 3 is a polar anisotropic magnet, the induced voltage induced in the drive coil 2 has a substantially sinusoidal waveform, and the Hall element (magnetic flux density distribution detecting means 4). The detected waveform is a substantially sinusoidal waveform. Further, the current waveform control means 7 controls the lower side switching elements Q2, Q4, Q6 while performing feedback control so that each phase current waveform of the drive coil 2 is substantially similar to the waveform of the Hall element (magnetic flux density distribution detection means 4). Since the ON / OFF duty is adjusted, the current supplied to the inverter circuit 6 does not have a non-energized section, and there is no steep change in the current waveform and the occurrence of ripple is suppressed. Further, outside the brushless DC motor 11, a DC voltage control means 8 constituted by a step-up / step-down chopper circuit, and a constant voltage output by the DC voltage control means 8 are reduced to reduce the PWM control means 23. Duty instruction voltage generation means 12 for instructing ON / OFF duty, current detection means 15 for detecting a current supplied to the inverter circuit 6, and an inverter circuit at a predetermined voltage of the DC voltage generated by the duty instruction voltage generation means 12 The reference current value indicating means 16 for setting the reference current value supplied to 6, the correlation indicating means 13, and the average current value supplied to the inverter circuit 6 detected by the current detecting means 15 is the current value indicating means 9. By controlling the duty instruction voltage generation means 12 so as to be equal to the current value instructed in step 1, the PWM control means 23 is turned on. Supply current value control means 17 that performs feedback control while varying the OFF duty, atmosphere temperature detection means 18 that detects the ambient temperature of the space in which the blower 10 is installed, temperature correction means 19, and air volume instruction means 20 Reference current value instruction changing means 21 and correlation changing means 22 are provided. The correlation instruction means 13 feeds back the change of the output voltage so that the output voltage-current characteristic of the duty instruction voltage generation means 12 becomes a characteristic as shown in FIG. Depending on the magnitude of the value, the current supplied to the inverter circuit 6 is linearly changed (proportional) with respect to the reference current value, and the current value indicating means 9 is instructed. At this time, an upper limit is set for the ON / OFF duty in consideration of the withstand voltage of the inverter circuit 6 and the kickback voltage, and a section for operating at a constant ON / OFF duty without controlling the current is provided. As shown in FIG. 2, when the ambient temperature detected by the ambient temperature detecting means 18 is higher than the reference temperature, the temperature correcting means 19 changes the reference current value indicated by the reference current value indicating means 16 to be high. On the contrary, when the ambient temperature detected by the ambient temperature detecting means 18 is lower than the reference temperature, the reference current value indicated by the reference current value indicating means 16 is changed to be low. Correlation indicating means 13 determines a change amount to be changed with respect to the reference current value instructed by reference current value indicating means 16 according to the magnitude of the resistance value of connected resistor R1, and reference current value indicating means 16 is The reference current value supplied to the inverter circuit 6 at a predetermined voltage of the DC voltage generated by the duty instruction voltage generation means 12 is determined according to the resistance value of the resistor R2 to be connected. The temperature correction means 19 determines the amount of change for changing the reference current value according to the difference between the reference temperature and the ambient temperature detected by the ambient temperature detection means 18 according to the magnitude of the resistance value of the connected resistor R3. The reference current value instruction change means 21 changes the resistance value of the resistor R2 connected to the reference current value instruction means 16 according to the instruction state of the air volume instruction means 20, and the correlation change means 22 indicates the instruction state of the air volume instruction means 20. Thus, the resistance value of the resistor R1 connected to the correlation instruction means 13 is changed.

  According to the air blower 10 of the present invention, the current supplied to the inverter circuit 6 with respect to the reference current value according to the magnitude of the voltage value output from the duty instruction voltage generation means 12 by the correlation instruction means 13 is compared with the reference current value. Since the current value indicating means 9 is instructed linearly, the supply current increases as the rotational speed increases. Conversely, the supply current decreases as the rotational speed decreases. Therefore, as shown in FIG. 3, the rotational speed-torque characteristic of the brushless DC motor 11 is obtained such that the shaft torque increases as the rotational speed increases. With this characteristic, in the ventilator 1 equipped with the blower 10, as shown in FIG. 4, an air volume-static pressure characteristic is obtained in which the air volume does not change greatly even if the pressure loss such as the external wind pressure or the duct length changes. . Furthermore, by changing the reference current value according to the temperature detected by the temperature correction means 19 by the ambient temperature detection means 18, when the detected temperature is higher than the reference temperature, the shaft torque is increased and detected. When the temperature is lower than the reference temperature, the characteristic that the shaft torque is reduced is obtained. With this characteristic, the ventilator 1 equipped with the blower 10 has an air volume-static pressure characteristic in which the ventilation air volume increases when the ambient temperature is high such as summer, and the ventilation air volume decreases when the ambient temperature is low such as winter. .

  In addition, even if the power supply voltage supplied to the DC voltage control means 8 fluctuates, the voltage applied to the inverter circuit 6 is constant and is applied to the drive coil 2 of the brushless DC motor 11 in order to control to a constant voltage. Since the correlation between the equivalent voltage and the current flowing through the drive coil 2 does not fluctuate, even if the supplied power supply voltage fluctuates, the rotational speed-torque characteristics of the brushless DC motor 11 shown in FIG. 3 do not change. The air volume-static pressure characteristics shown in 4 are always obtained.

  In addition, the brushless DC motor 11 is used to determine a change amount to be changed with respect to the reference current value instructed by the reference current value instructing means 16 according to the resistance value of the resistor R1 connected to the correlation instructing means 13. It is possible to change the degree of increase in the shaft torque as the rotational speed increases in the rotational speed-torque characteristics. Therefore, the specification adjustment for responding to the change in the in-machine resistance of the ventilation device 1, the specification adjustment for responding to the load change by changing the blade diameter of the centrifugal blower 10a, the number of blades, the blade specification, The air volume-static pressure characteristics of the blower 10 can be adjusted. Therefore, the man-hour required for the specification adjustment can be greatly reduced, and the brushless DC motor 11 and the main control circuit can be standardized.

  Further, the reference current value supplied to the inverter circuit 6 at a predetermined voltage of the DC voltage generated by the duty instruction voltage generation means 12 is determined by the magnitude of the resistance value of the resistor R2 connected to the reference current value instruction means 16. . Therefore, the specification adjustment for the change of the in-machine resistance of the ventilator 1 and the adjustment of the air volume in the air volume-static pressure characteristics of the ventilator 1 can be performed, and the man-hour required for the specification adjustment can be greatly reduced. The brushless DC motor and main control circuit can be standardized.

  Further, the temperature correction means 19 determines the amount of change for changing the reference current value according to the difference between the reference temperature and the ambient temperature detected by the ambient temperature detection means 18 according to the magnitude of the resistance value of the connected resistor R3. Therefore, the amount of change that changes the air volume according to the change in the ambient temperature can be easily adjusted according to the specifications required by the ventilator 1, so that the man-hours required for adjusting the specifications can be greatly reduced, and the brushless DC motor and the main control It will be possible to standardize the circuit.

  Further, the resistance value of the resistor R2 connected to the reference current value instruction unit 16 is changed according to the instruction state of the air volume instruction unit 20. Therefore, since the air volume adjustment according to the air volume instruction of the air volume instruction means 20 can be easily performed, it is possible to adjust only the resistance R2 according to the required air volume required in the room where the ventilator 1 is installed. The man-hours required for this can be greatly reduced, and the brushless DC motor and the main control circuit can be standardized.

  Further, the correlation changing unit 22 changes the resistance value of the resistor R <b> 1 connected to the correlation instructing unit 13 according to the instruction state of the air volume instructing unit 20. Therefore, since the air volume characteristic according to the air volume-static pressure characteristics required by the blower 10 can be easily achieved, it is possible to adjust only the resistance R1 according to the required air volume required in the room where the ventilator 1 is installed. Therefore, the man-hours required for adjusting the specifications can be greatly reduced, and the brushless DC motor and the main control circuit can be standardized.

  Further, since the drive logic control means 5 supplies the drive coil 2 with a current without a non-energized section, the current ripple supplied to the inverter circuit is greatly reduced, and the current detection precision by the current detection means 15 is increased. Therefore, the air blower 10 and the ventilator 1 that realize high accuracy of the air volume accuracy and low vibration by reducing the torque ripple of the motor can be realized.

  Further, the gap between the magnetic flux density distribution detecting means 4 and the magnet is set so that the waveform detected by the magnetic flux density distribution detecting means 4 is substantially similar to the induced voltage waveform induced in the drive coil 2 by the polar anisotropic magnet 3a. The current waveform control means 7 causes the induced voltage waveform and the current waveform to be substantially similar by passing a current substantially similar to the magnetic flux density distribution waveform detected by the magnetic flux density distribution detection means 4 to the drive coil 2. Torque ripple and torque change rate can be further reduced. Furthermore, since the motor efficiency is greatly improved, the blower 10 and the ventilator 1 that achieve low noise and high efficiency are obtained.

  In addition, since the main magnetic pole portion of the magnet rotor 3 is the polar anisotropic magnet 3a, both the induced voltage waveform and the current waveform are sinusoidal waves, so that the torque ripple and the torque change rate can be further reduced. At the same time, the motor efficiency is also greatly improved, so that the blower 10 and the ventilation device 1 that achieve noise reduction and high efficiency can be obtained.

  In the first embodiment, the correlation instruction means 13 linearly changes the current supplied to the inverter circuit 6 with respect to the reference set value in accordance with the magnitude of the voltage value output from the duty instruction voltage generation means 12. However, it is also possible to use a non-linear change (proportional to higher-order proportions), which is similarly set by appropriately setting the characteristic curve of the rotational speed-torque characteristics from the load such as the fan load. The effect of this can be obtained.

  Further, in the first embodiment, the current waveform supplied to the drive coil 2 is configured to be substantially similar to the induced voltage waveform, but depending on the use, the required air volume accuracy and the noise level of the product, A 120-degree rectangular wave energization, a wide-angle energization system such as 140-degree and 150-degree energization, and a sinusoidal drive system using two-phase modulation may be used. There is no difference in obtaining the characteristic of increasing.

  In the first embodiment, the magnetic flux density distribution detecting means 4 is used. However, a sensorless method for detecting an induced voltage induced in a non-energized phase or a current to determine a conducting phase for a magnet rotor, A system using magnetic pole position detecting means for detecting the magnetic pole position of the magnet rotor by judging the N pole and S pole of a magnet such as a Hall IC may be used, and there is no difference in its operational effect.

  Further, in the first embodiment, the DC voltage control means 8 is configured by a step-up / step-down chopper circuit, but may be configured by a step-down chopper circuit, and there is no difference in the operation effect.

  Moreover, in this Embodiment 1, although it was set as the structure which inputs DC voltage from the external power supply to the air blower 10, it is set as the structure which inputs commercial AC voltage, rectifies and smoothes, and supplies it to the DC voltage control means 8 here. It does not make a difference in its effects.

  Moreover, in this Embodiment 1, although it was set as the structure provided with the DC voltage control means 8, if the stabilized DC power supply without a fluctuation | variation is supplied to the air blower 10, the DC voltage control means 8 is not provided. It is good also as a structure, and a difference does not arise in the air volume characteristic shown in FIG.

(Embodiment 2)
As shown in FIGS. 6 and 7, reference numeral 27 denotes a rectifier, 28 denotes a smoother, and the supplied commercial AC power is rectified and smoothed by the rectifier 27 and the smoother 28 and applied to the inverter circuit 6. Reference numeral 25 denotes applied voltage detection means, and reference numeral 26 denotes reference current value correction means. The same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. The applied voltage detection means 25 detects the voltage value of the DC voltage applied to the inverter circuit 6, and the reference current value correction means 26 responds to the difference between the voltage detected by the applied voltage detection means 25 and the reference voltage. If the detected voltage is lower than the reference voltage, the reference voltage indicated by the reference current value indicating means 16 is lowered. Conversely, if the detected voltage is higher than the reference voltage, the reference current is The brushless DC motor 11, the inverter circuit 6, the drive logic control means 5, the current detection means 15, the reference current value indication means 16, and other components constituting the air blower 10 are configured to increase the reference voltage indicated by the value instruction means 16. The configurations of the correlation instruction unit 13 and the temperature correction unit 19 are the same as those in the first embodiment.

  According to the blower device 10 of the present invention, as shown in FIG. 7, according to the difference between the voltage detected by the reference current value correction unit 26 by the applied voltage detection unit 25 and the reference voltage, When the voltage detected by the applied voltage detecting means 25 is lower than the reference voltage, the reference voltage indicated by the reference current value indicating means 16 is lowered, and conversely, the voltage detected by the applied voltage detecting means 25 is the reference. If the voltage is higher, the reference voltage specified by the reference current value indicating means 16 is increased. Therefore, even if the power supply voltage supplied to the blower 10 fluctuates, the correlation between the equivalent voltage applied to the drive coil 2 of the brushless DC motor 11 and the current flowing through the drive coil 2 does not change, and the brushless DC motor No change is made in the rotational speed-torque characteristics of the air blower 10, and the air flow of the blower 10 is also kept from fluctuating. As shown in FIG. can get.

  In the second embodiment, a commercial AC power supply is input to the blower 10 and rectified and smoothed. However, a DC power supply after rectified and smoothed may be supplied, and there is no difference in operational effects.

  In addition, there is no difference in the operational effect in the configuration similar to the configuration shown in the first embodiment.

(Embodiment 3)
As shown in FIG. 8, reference numeral 30 denotes an AC power supply connection means for connecting a commercial AC power supply, which includes a strong output connection terminal 30a, a weak output connection terminal 30b, and a common connection terminal 30c. The same parts are denoted by the same reference numerals and detailed description thereof is omitted. An external switch 29 is connected to either the strong output connection terminal 30a or the weak output connection terminal 30b. The input commercial AC power is rectified and smoothed by the rectifying means 27 and the smoothing means 28, and the inverter circuit 6 To be applied. Reference numeral 31 denotes speed adjustment instruction detection means, which detects whether the external switch 29 is connected to the strong output connection terminal 30a or the weak output connection terminal 30b, and the air volume instruction means 32 outputs the speed adjustment instruction means 31. In response to the signal, the signal is sent to the reference current value instruction changing means 21 and the correlation changing means 22. Other configurations of the brushless DC motor 11, the inverter circuit 6, the drive logic control means 5, the current detection means 15, the reference current value instruction means 16, the correlation instruction means 13, the temperature correction means 19, etc. constituting the blower 10 are implemented. This is the same as Embodiment 1 and Embodiment 2.

  According to the air blower 10 of the present invention as described above, in the AC power supply connection means 30, two places are provided such as the strong output connection terminal 30a and the weak output connection terminal 30b, and the speed adjustment instruction detection means 31 is provided in the strong output connection terminal 30a. Or whether it is connected to the weak output connection terminal 30b. Based on the result, the air volume instruction means 32 controls the reference current value instruction change means 21 to change the resistance value of the resistor R2 connected to the reference current value instruction means 16. Therefore, since the reference set value of the current supplied to the inverter circuit 6 is changed, a two-stage air volume can be obtained, so that a blower capable of adjusting the speed by switching the connection of the AC power supply line is obtained. Here, in the AC power source connection means 30, if the air volume instruction means 32 changes the reference set value according to the number of connection terminals, the speed can be adjusted so that it can be controlled corresponding to the change in ambient temperature by the number of connection terminals. It becomes.

  Further, since the air volume instruction means 32 controls the correlation changing means 22 to change the resistance value of the resistor R1 connected to the correlation instruction means 13, the air volume-static pressure characteristic can be easily changed by switching the connection of the AC power supply line. An air blower that can be used is obtained. Here, in the AC power source connection means 30, if the air volume instruction means 32 changes the correlation in accordance with the number of connection terminals, the air volume characteristics that can be controlled corresponding to the change in the ambient temperature by the number of connection terminals can be adjusted. It will be possible.

  In addition, there is no difference in the operational effect in the same configuration as the configuration shown in the first and second embodiments.

  As described above, the blower according to the present invention can obtain a characteristic in which the shaft torque increases as the rotational speed increases in the rotational speed-torque characteristics in the output characteristics of the brushless DC motor according to the ambient temperature. Therefore, air conditioners such as ventilators, water heaters, air conditioners, air purifiers, dehumidifiers, dryers, fan filters, etc. It is useful to install on a unit.

The block diagram which shows the structure of the ventilator which incorporated the air blower in Embodiment 1 of this invention. The graph which shows an example of the command voltage-inverter circuit supply current characteristic which instruct | indicates the ON / OFF duty which switches the inverter circuit mounted in the air blower The graph which shows an example of the rotation speed-torque characteristic of the brushless DC motor mounted in the air blower A graph showing the air flow-static pressure characteristics of a ventilator equipped with the same blower Three-sided view showing a ventilator equipped with the blower The block diagram which shows the structure of the ventilation apparatus which incorporated the air blower in Embodiment 2 of this invention. The graph which shows an example of the command voltage-inverter circuit supply current characteristic which instruct | indicates the ON / OFF duty which switches the inverter circuit mounted in the air blower The block diagram which shows the structure of the ventilator which incorporated the air blower in Embodiment 3 of this invention. Block diagram showing the configuration of a conventional blower

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ventilator 2 Drive coil 3 Magnet rotor 4 Magnetic flux density distribution detection means 5 Drive logic control means 6 Inverter circuit 7 Current waveform control means 8 DC voltage control means 9 Current value instruction means 10 Blower 10a Centrifugal blower 11 Brushless DC motor DESCRIPTION OF SYMBOLS 12 Duty instruction | indication voltage production | generation means 13 Correlation instruction | indication means 15 Current detection means 16 Reference current value instruction means 17 Supply current value control means 18 Ambient temperature detection means 19 Temperature correction means 20 Air volume instruction means 21 Reference current value instruction change means 22 Correlation Change means 23 PWM control means 24 Duct 25 Applied voltage detection means 26 Reference current value correction means 27 Rectification means 28 Smoothing means 29 External switch 30 AC power supply connection means 30a Strong output connection terminal 30b Weak output connection terminal 30c Common connection terminal 31 Speed adjustment Instruction detection means 32 Airflow instruction means Q1 Upper stage switching element Q2 Lower stage switching element Q3 Upper stage switching element Q4 Lower stage switching element Q5 Upper stage switching element Q6 Lower stage switching element R1 Resistance R2 Resistance R3 Resistance

Claims (12)

A centrifugal blower equipped with a brushless DC motor;
An inverter circuit composed of an upper stage and a lower stage, each bridged by a plurality of switching elements;
A drive logic control means for PWM-controlling the upper or lower stage of the switching element with a DC voltage applied to the inverter circuit, and sequentially energizing the drive coil of the brushless DC motor in a predetermined direction and order;
A duty instruction voltage generating means for indicating an ON / OFF duty when the switching element is PWM controlled;
A supply current value control means for changing the output of the duty instruction voltage generating means to vary the ON / OFF duty of the PWM control of the switching element to control the average current supplied to the inverter circuit substantially constant;
Current value indicating means for indicating an average current value controlled substantially constant by the supply current value control means,
When the duty instruction voltage generating means indicates a predetermined voltage, the current value indicated by the current value indicating means is set as a reference current value,
A reference current value indicating means for indicating the reference current value;
An atmospheric temperature detecting means for detecting the atmospheric temperature;
Correlation indicating means for indicating a correlation with an average current value indicated by the current value indicating means according to the voltage value of the DC voltage generated by the duty indicating voltage generating means;
A temperature correction unit for changing the reference current value according to the ambient temperature detected by the ambient temperature detection unit;
The correlation indicating means determines an average current value indicated by the current value indicating means by changing linearly or nonlinearly with respect to the reference current value,
The temperature correction means increases the reference current value when the ambient temperature is higher than the reference temperature, and lowers the reference current value when the ambient temperature is lower than the reference temperature .
The air volume-static pressure characteristic in which the air volume does not change greatly even if the pressure loss changes, the air volume increases when the ambient temperature is high, and decreases when the ambient temperature is low . 2. The blower according to claim 1, further comprising a DC voltage control means formed by a chopper circuit that controls a voltage value of the DC voltage applied to the inverter circuit to be constant. In accordance with the difference between the applied voltage detecting means for detecting the voltage value of the DC voltage applied to the inverter circuit and the voltage value detected by the applied voltage detecting means and the reference voltage, the reference current value indicating means 2. The blower according to claim 1, further comprising reference current value correcting means for correcting the instructed reference current value. 4. The correlation instructing unit determines a change amount to be changed with respect to a reference current value instructed by the reference current value instructing unit according to a magnitude of a resistance value to be connected. The air blower in any one. The blower according to any one of claims 1 to 4, wherein the reference current value instruction means determines a reference current value to be indicated according to a magnitude of a resistance value to be connected. The said temperature correction means determines the variation | change_quantity which changes a reference electric current value according to the difference with reference temperature by the magnitude | size of the resistance value to connect, The ventilation in any one of Claims 1-5 characterized by the above-mentioned. apparatus. An air volume instruction means, and a reference current value instruction change means for changing a resistance value connected to the reference current value instruction means, and the reference current value instruction change means changes the reference current value according to an instruction state of the air volume instruction means. The blowing device according to any one of claims 4 to 6, wherein a resistance value connected to the instruction means is changed. Correlation changing means for changing the resistance value connected to the correlation instruction means is provided, and the correlation changing means changes the resistance value connected to the correlation instruction means according to the instruction state of the air flow instruction means. The blower according to claim 7, characterized in that A plurality of AC power supply connection means for connecting an AC power supply are provided, and a supply current set value changing means for changing the reference current value indicated by the reference current value indicating means is provided according to the connection location to the AC power supply connecting means. The air blower according to any one of claims 1 to 6, wherein The blower according to any one of claims 1 to 9, wherein the drive logic control means supplies a current without a non-energized section to the drive coil. The electric equipment carrying the air blower in any one of Claims 1-10. The electrical device according to claim 11, wherein the electrical device is any one of a ventilator, a dehumidifier, a humidifier, an air conditioner, a water heater, and a fan filter unit.

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