JP4650484B2 - 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 converter 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 controller 122 is connected to the current detector 121. The output voltage of the DC voltage conversion 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 conversion means 108 and instructs the current value instruction means 119.
Japanese Patent 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, circuit miniaturization, high quality, and the amount of change in air volume is extremely small even when static pressure changes such as pressure loss. An air blower that realizes accurate air flow-static pressure characteristics and increases the air flow when the ambient temperature is high, and conversely reduces the air flow when the ambient temperature is low, according to changes in the ambient temperature. It is intended to provide.

  In order to achieve the above object, the air blower of the present invention comprises 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 connected to the inverter circuit. DC voltage conversion means formed by a chopper circuit for applying a voltage, and a DC voltage generated by the DC voltage conversion means to a drive coil of the brushless DC motor via the inverter circuit in a predetermined direction and order. Drive logic control means for sequentially energizing all waves, supply current value control means for controlling the average current supplied to the inverter circuit to be substantially constant by varying the output of the DC voltage conversion means, and the supply current value control Current value indicating means for indicating an average current value controlled substantially constant by the means, and direct current generated by the direct current voltage converting means A reference current value indicating means for indicating a reference current value indicated by the current value indicating means, an ambient temperature detecting means for detecting an ambient temperature, and the DC voltage converting means for the current value indicating means Correlation indicating means for indicating the correlation with the average current value indicated by the current value indicating means is arranged according to the voltage value of the DC voltage generated in step, and the correlation indicating means is the reference current value indicating An average current value indicated by the current value indicating means is determined by changing linearly or nonlinearly with respect to the reference current value indicated by the means, and the ambient temperature detected by the ambient temperature detecting means is lower than the reference temperature. If it is higher, the reference current value indicated by the reference current value indicating means is increased. If the detected ambient temperature is lower than the reference temperature, the reference current value indicating means indicates Is obtained by the configuration of the blower, characterized in that a temperature correction means for lowering the reference current value.

  By this means, the reference current value indicating means indicates the reference current value indicated by the current value indicating means when the DC voltage generated by the DC voltage converting means is a predetermined voltage, and the temperature correcting means is detected by the ambient temperature detecting means. If the ambient temperature is higher than the reference temperature, the reference current value indicated by the reference current value indicating means is increased. If the detected ambient temperature is lower than the reference temperature, the reference current value indicating means is specified. Since the reference current value is lowered, the expansion of circuit space can be suppressed and the quality can be improved, and as the rotational speed increases, the axial torque increases further. In the rotational speed-torque characteristics, the axial torque increases as the ambient temperature increases. As the ambient temperature decreases, the shaft torque decreases, so the higher the ambient temperature, the greater the amount of air flow, and the lower the ambient temperature, the smaller the amount of air flow. Together comprising, airflow static pressure, such as pressure loss does not change significantly the wind amount change - blower and electric equipment can be realized static pressure characteristic is obtained.

  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, 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, so that the man-hours required for the specification adjustment can be greatly reduced, and the motor can be standardized. A blower 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 rotation speed-torque characteristics, the shaft torque increases as the ambient temperature increases, and the shaft torque decreases as the ambient temperature decreases, so if the ambient temperature increases, the air flow increases, and the ambient temperature decreases. An air blower and an electric device capable of realizing 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 as the air volume decreases. It can do today.

  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.

  In addition, 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. 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 of which is bridge-connected by a plurality of switching elements, and a DC voltage is applied to the inverter circuit. DC voltage conversion means formed by the chopper circuit that performs the direct current voltage generated by the DC voltage conversion means to the drive coil of the brushless DC motor via the inverter circuit in a predetermined direction and in order Drive logic control means for energization, supply current value control means for controlling the average current supplied to the inverter circuit to be substantially constant by varying the output of the DC voltage conversion means, and the supply current value control means Current value indicating means for instructing an average current value to be controlled to be constant, and a predetermined voltage of the DC voltage generated by the DC voltage converting means The reference current value indicating means for indicating the reference current value indicated by the current value indicating means, the ambient temperature detecting means for detecting the ambient temperature, and the current value indicating means are generated by the DC voltage converting means. Correlation indicating means for indicating the correlation with the average current value indicated by the current value indicating means is arranged according to the voltage value of the DC voltage, and the correlation indicating means is indicated by the reference current value indicating means. When the average temperature value indicated by the current value indicating means is changed linearly or nonlinearly with respect to the reference current value determined, and the ambient temperature detected by the ambient temperature detecting means is higher than the reference temperature, When the reference current value indicated by the reference current value indicating means is increased and the detected ambient temperature is lower than the reference temperature, the reference current value indicated by the reference current value indicating means is The temperature value correcting means is provided, and the current value indicating means indicates when the DC voltage generated by the reference current value indicating means is a predetermined voltage. If the ambient temperature detected by the ambient temperature detection means is higher than the reference temperature, the reference current value indicated by the reference current value indicating means is increased and the detected atmosphere is detected. When the temperature is lower than the reference temperature, the reference current value indicated by the reference current value indicating means is lowered. Therefore, when the ambient temperature increases, the shaft torque of the brushless DC motor increases, and when the ambient temperature decreases, the brushless DC motor. This has the effect of reducing the shaft torque.

  The invention according to claim 2 is characterized in that the correlation instruction means determines a change amount to be changed 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 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 third 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 connected resistance value. The air volume can be adjusted by changing the resistance value of the resistor connected to the means.

  According to a fourth 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. Thus, 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 5 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 is determined 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 a sixth 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.

  According to the seventh aspect of the present invention, a plurality of AC power supply connection means for connecting an AC power supply is provided, and the reference current value indicated by the reference current value indicating means is changed according to the connection location to the AC power supply connection 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 an eighth aspect of the present invention, the drive logic control means supplies a current without a non-energized section to the drive coil, and the ripple of 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 room air generated by smoke or cooking sucked by the blower 10 passes through the wall of the building via the discharge port of the ventilator 1 and the duct 23 and is discharged to the outside. The magnet rotor 3 of the brushless DC motor 11 is formed by integrally molding a plastic magnet with a shaft with a polar orientation during injection molding. The main magnetic pole portion is a polar anisotropic magnet, and 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. In addition, a Hall element 4 serving as a magnetic pole position detecting means for detecting the magnetic pole position and magnetic flux density distribution of the magnet rotor 3, a magnetic flux density distribution waveform synthesizing means 12 for synthesizing the output waveform of the Hall element 4, and an upper switching element Full-wave energization is sequentially applied to the drive coil 2 in a predetermined direction and order based on the output of the inverter circuit 6 in which Q1, Q3, Q5 and the lower side switching elements Q2, Q4, Q6 are bridge-connected and the magnetic flux density distribution waveform synthesizing means 12. The drive logic control means 5 for controlling ON / OFF of the switching elements Q1 to Q6 and the phase current waveform of the drive coil 2 are substantially similar to waveforms obtained by removing harmonic components by the magnetic flux density distribution waveform synthesis means 12. The output bias voltage is fed back while the switching elements Q1 to Q6 are fed back so as to be in a non-saturated state close to saturation. It incorporates a current waveform control means 7 for adjusting. 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 detection waveform of the Hall element 4 also has a substantially sinusoidal waveform. It becomes the waveform. The magnetic flux density distribution waveform synthesizing means 12 subtracts the v-phase waveform from the u-phase waveform of the Hall element 4 in order to remove the harmonic component of the current waveform supplied to the u-phase of the drive coil 2. The w-phase waveform is subtracted from the v-phase waveform of the Hall element 4 for the v-phase, and the u-phase waveform is subtracted from the w-phase waveform of the Hall element 4 for the w-phase of the drive coil. The current waveform control means 7 has the switching elements Q1 to Q6 close to saturation so that each phase current waveform of the drive coil 2 is substantially similar to the waveform from which the harmonic component is removed by the magnetic flux density distribution waveform synthesis means 12. Since the output bias current is adjusted while feeding back so as to be in a non-saturated state, the current supplied to the inverter circuit 6 has no non-energization period, and there is no steep change in the current waveform and the occurrence of ripple is suppressed. The Rukoto. Further, outside the brushless DC motor 11, DC voltage conversion means 8, current detection means 15, reference current value instruction means 16, correlation instruction means 13, supply current value control means 17, and ambient temperature detection Means 18, temperature correction means 19, air volume instruction means 20, reference current value instruction change means 21, and correlation change means 22 are arranged. The DC voltage conversion means 8 is constituted by a step-up / step-down chopper circuit, and the current detection means 15 detects a current supplied to the inverter circuit 6. The reference current value indicating means 16 sets a reference current value supplied to the inverter circuit 6 when the DC voltage generated by the DC voltage converting means 8 is a predetermined voltage. The supply current value control means 17 changes the DC voltage value so that the average current value supplied to the inverter circuit 6 detected by the current detection means 15 is equivalent to the current value indicated by the current value indication means 9. By controlling the means 14, feedback control is performed while varying the voltage output from the DC voltage converting means 8. The atmospheric temperature detection means 18 detects the atmospheric temperature of the space where the blower 10 is installed. The correlation indicating means 13 feeds back the change in the output voltage so that the output voltage-current characteristic of the DC voltage converting means 8 becomes a characteristic as shown in FIG. Depending on the magnitude, the current supplied to the inverter circuit 6 is linearly changed (proportional) to the reference current value, and the current value indicating means 9 is instructed. At this time, in consideration of the withstand voltage of the inverter circuit 6 and the kickback voltage, an upper limit is provided for the DC voltage applied to the inverter circuit 6, and a section for operating at a constant voltage without current control 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 atmospheric temperature detected by the atmospheric 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. The reference current value indicating means 16 determines the reference current value supplied to the inverter circuit 6 when the DC voltage generated by the DC voltage converting means 8 is a predetermined voltage according to the magnitude of the resistance value of the connected resistor R2. 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. The correlation changing unit 22 is configured to change the resistance value of the resistor R1 connected to the correlation indicating unit 13 according to the instruction state of the air volume indicating unit 20.

  According to the air blower 10 of the present invention as described above, 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 DC voltage converting means 8 by the correlation instruction means 13. Since the current value indicating means 9 is instructed linearly, the supply current increases as the rotational speed increases, and 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, as shown in FIG. 3, the ventilation device 1 equipped with the air blower 10 can obtain an air volume-static pressure characteristic 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, as shown in FIG. 4, in the ventilator 1 equipped with the air blower 10, the ventilation air volume increases when the ambient temperature is high such as summer, and the air volume decreases when the ambient temperature is low such as winter. -Static pressure characteristics are obtained.

  Further, the amount of change to be changed with respect to the reference current value instructed by the reference current value instruction means 16 is determined by the magnitude of the resistance value of the resistor R1 connected to the correlation instruction means 13. Therefore, it is possible to change the degree of increase in shaft torque as the rotational speed increases in the rotational speed-torque characteristics of the brushless DC motor 11. That is, specification adjustment for responding to changes in the in-machine resistance of the ventilator 1, specification adjustment for responding to load changes by changing the blade diameter of the centrifugal fan 10a, changing the number of blades, changing blade specifications, The air flow-static pressure characteristics of the blower 10 can be adjusted, the number of man-hours required for specification adjustment can be greatly reduced, and the brushless DC motor 11 and main control circuits can be standardized.

  Further, in order to determine the reference current value supplied to the inverter circuit 6 at a predetermined voltage of the DC voltage generated by the DC voltage converting means 8 according to the magnitude of the resistance value of the resistor R2 connected to the reference current value indicating means 16. The specification adjustment for responding to the change of the in-machine resistance of the ventilator 1 and the air volume in the air volume-static pressure characteristic of the ventilator 1 can be adjusted. Therefore, the man-hour required for the specification adjustment can be greatly reduced, and the standardization of the brushless DC motor and the main control circuit can be made possible.

  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. The amount of change that changes the air volume due to changes 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, as well as the brushless DC motor and the main control circuit. Can be standardized.

  Further, since the resistance value of the resistor R2 connected to the reference current value instruction unit 16 is changed depending on the instruction state of the air volume instruction unit 20, the air volume adjustment according to the air volume instruction of the air volume instruction unit 20 can be easily performed. In other words, since only the resistor R2 can be adjusted according to the required air volume required in the room where the ventilation device 1 is installed, the man-hours required for adjusting the specifications can be greatly reduced, and the brushless DC motor and the main control circuit can be reduced. Can be standardized.

  Further, the correlation changing unit 22 changes the resistance value of the resistor R1 connected to the correlation instructing unit 13 according to the instruction state of the air volume instructing unit 20, so that the air blower 10 is in accordance with the required air volume-static pressure characteristics. Easy airflow characteristics. In other words, since only the resistor R1 can be adjusted according to the required air volume required in the room where the ventilation device 1 is installed, the man-hours required for specification adjustment can be greatly reduced, and the brushless DC motor and the main control circuit can be reduced. 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. Since the torque ripple and the rate of change in torque can be further reduced, and 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.

  Further, the magnetic flux density distribution waveform synthesizing unit 12 synthesizes the u-phase, v-phase, and w-phase waveforms detected by the magnetic flux density distribution detection unit 4, so that the influence of variations in the magnetic flux density distribution detection unit 4 of each phase is affected. As the magnetic flux density distribution waveform of each of the u-phase, v-phase, and w-phase is basically a waveform that is simply shifted in phase, the detected magnetic flux is obtained by subtracting and synthesizing the two phases. Since the harmonic component contained in the density distribution waveform is removed, the occurrence of rotation unevenness can be suppressed and the torque ripple and the rate of torque change can be further reduced. Device 1 is obtained.

  In the first embodiment, the correlation instruction means 13 instructs the current supplied to the inverter circuit 6 to change linearly with respect to the reference set value in accordance with the magnitude of the voltage value output from the DC voltage conversion means 8. However, a non-linear change (higher-order proportionality) may be used, and the same effect can be obtained by appropriately setting the characteristic curve of the rotational speed-torque characteristic from the load such as a fan load. An effect 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 method of determining an energization phase for a magnet rotor by detecting an induced voltage or current induced in a non-energization phase, 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 an IC may be used, and there is no difference in the operation effect.

  Further, in the first embodiment, the output bias current is adjusted while feeding back so that the switching elements Q1 to Q6 are close to saturation, but the switching elements Q1 to Q6 are PWM-controlled to control the current waveform. In this case, since the loss of the switching elements Q1 to Q6 can be reduced, the heat generation of the switching elements Q1 to Q6 is suppressed, and a blower device that can further widen the range of usable load torque can be obtained. .

  Further, in the first embodiment, the DC voltage converting means 8 is configured by a step-up / step-down chopper circuit, but it 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 a DC voltage from the external power supply to the air blower 10, as a structure which inputs a commercial AC voltage, rectifies and smoothes, and supplies it to the DC voltage conversion means 8 It does not make a difference in its effects.

(Embodiment 2)
As shown in FIG. 6, reference numeral 25 denotes an AC power supply connection means for connecting a commercial AC power supply, which includes a strong output connection terminal 25 a, a weak output connection terminal 25 b, and a common connection terminal 25 c, and the same parts as those in the first embodiment are the same. A number is attached and detailed explanation is omitted. An external switch 24 is connected to either the strong output connection terminal 25a or the weak output connection terminal 25b, 28 is a rectifying means, 29 is a smoothing means, and the input commercial AC power supply is the rectifying means 28 and the smoothing means. It is rectified and smoothed at 29 and input to the DC voltage converting means 8. Reference numeral 26 denotes speed adjustment instruction detection means, which detects whether the external switch 24 is connected to the strong output connection terminal 25a or the weak output connection terminal 25b, and the air volume instruction means 27 outputs the output of the speed adjustment instruction means 26. Upon receiving the signal, the signal is sent to the reference current value instruction changing means 21 and the correlation changing means 22. The brushless DC motor 11, the inverter circuit 6, the drive logic control means 5, the DC voltage conversion means 8, the current detection means 15, the reference current value instruction means 16, the correlation instruction means 13, and the temperature correction means that constitute the other blower device 10. The configuration such as 19 is the same as that of the first embodiment.

  According to the air blower 10 of the present invention as described above, in the AC power supply connecting means 25, two places are provided such as the strong output connecting terminal 25a and the weak output connecting terminal 25b, and the speed adjustment instruction detecting means 26 is the strong output connecting terminal 25a. Is connected to the weak output connection terminal 25b, and based on the result, the air volume instruction means 27 controls the reference current value instruction change means 21 to the reference current value instruction means 16. Since the resistance value of the resistor R2 to be connected is changed, the reference set value of the current supplied to the inverter circuit 6 is changed, so that a two-stage air volume can be obtained, so that the speed can be adjusted by switching the connection of the AC power line. Can be obtained. Here, in the AC power source connecting means 25, if the air volume instruction means 27 changes the reference set value according to the number of connecting terminals, the speed can be controlled so as to respond to changes in the ambient temperature by the number of connecting terminals. It becomes.

  Further, since the air volume instruction means 27 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 characteristics 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 supply connecting means 25, if the air volume instruction means 27 changes the correlation according to 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 configuration similar to the configuration shown in the first embodiment.

  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 voltage-current characteristic of the power supply supplied to the brushless DC motor 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 The figure which shows the ventilator which mounts the air blower ((a) the figure seen from the front, (b) the figure seen from the bottom, (c) the figure seen from the side) The block diagram which shows the structure of the ventilation apparatus which incorporated the air blower in Embodiment 2 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 conversion means 9 Current value instruction means 10 Blower 10a Centrifugal blower 11 Brushless DC motor 12 Magnetic flux density distribution waveform synthesizing means 13 Correlation indicating means 14 DC voltage value changing means 15 Current detecting means 16 Reference current value indicating means 17 Supply current value controlling means 18 Atmospheric temperature detecting means 19 Temperature correcting means 20 Air volume indicating means 21 Reference current Value instruction change means 22 Correlation change means 23 Duct 24 External switch 25 AC power supply connection means 25a Strong output connection terminal 25b Weak output connection terminal 25c Common connection terminal 26 Speed adjustment instruction detection means 27 Airflow instruction means 28 Rectification means 29 Smoothing means Q1 Upper side switching element Child 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 (10)

DC voltage conversion formed by a centrifugal blower equipped with a brushless DC motor, an inverter circuit composed of an upper stage and a lower stage, each bridged with a plurality of switching elements, and a chopper circuit that applies a DC voltage to the inverter circuit And a drive logic control means for sequentially energizing the DC voltage generated by the DC voltage conversion means to the drive coil of the brushless DC motor sequentially in a predetermined direction and order via the inverter circuit, Supply current value control means for controlling the average current supplied to the inverter circuit to be substantially constant by changing the output of the DC voltage conversion means, and current for indicating the average current value to be controlled to be substantially constant by the supply current value control means The current value indicating means indicates the value indicating means and a predetermined voltage of the DC voltage generated by the DC voltage converting means. In accordance with the voltage value of the DC voltage generated by the DC voltage converting means, the reference current value indicating means for indicating the reference current value, the ambient temperature detecting means for detecting the ambient temperature, and the current value indicating means, Correlation indicating means for indicating the correlation with the average current value indicated by the current value indicating means is provided, and the correlation indicating means is linear with respect to the reference current value indicated by the reference current value indicating means. Alternatively, an average current value to be instructed by the current value instructing means is determined in a non-linear manner, and when the ambient temperature detected by the ambient temperature detecting means is higher than a reference temperature, instructed by the reference current value instructing means If the detected reference temperature is lower than the reference temperature, temperature correction means is provided to lower the reference current value indicated by the reference current value indicating means. Blower apparatus according to claim. 2. The air blower according to claim 1, wherein the correlation instruction unit determines a change amount to be changed with respect to the reference current value instructed by the reference current value instruction unit according to a magnitude of a connected resistance value. apparatus. The blower according to claim 1 or 2, wherein the reference current value indicating 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 1-3 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 2 to 4, 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 air blower according to claim 5, wherein 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 blower according to any one of claims 1 to 4, wherein the blower is provided. The blower device according to claim 1, wherein the drive logic control unit supplies a current without a non-energized section to the drive coil. The electric equipment carrying the air blower in any one of Claims 1-8. The electrical device according to claim 9 is any one of a ventilator, a dehumidifier, a humidifier, an air conditioner, a hot water heater, and a fan filter unit.

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