JP2013031360A - Dc brushless motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an AC-input DC brushless motor that allows direct input of AC power, such as commercial AC power, and that is allowed to be driven at a speed according to the frequency of the commercial AC power.SOLUTION: An AC-input DC brushless motor includes: a motor section that has, at least, drive windings and a mover; a power element that supplies drive power to the drive windings; a power control section that controls the drive power; a speed control section that generates a speed control signal; and a terminal section to which commercial AC power is input. The power control section controls the amount of current flowing through the power element by means of the speed control signal. According to the frequency of the commercial AC power that is input to the terminal section, the speed control section outputs the speed control signal to the power control section. In the speed control section, at least the motor section, the power element, the power control section, and the speed control section are incorporated. The commercial AC power is connected to the terminal section, and the DC brushless motor is thus driven at a speed according to the frequency of the commercial AC power.

Description

  The present invention relates to an AC input DC brushless motor that is mainly used in home appliances such as air conditioners and is driven by directly inputting commercial AC power.

  As a motor that can be directly driven by a commercial AC power supply, an induction motor is well known as disclosed in Patent Document 1, and has been used for a rotating mechanism such as a fan of an air conditioner.

  However, induction motors have a problem in terms of efficiency because they need to be excited to a secondary conductor in principle, and replacement with DC brushless motors is advancing due to the recent increase in efficiency of equipment and demand for power saving. is there. And this trend is getting stronger with increasing global environmental awareness.

  In order to replace the DC brushless motor with an induction motor, it is necessary to provide a DC power source for driving, a speed control function for realizing a rotational speed accuracy performance equivalent to that of the induction motor, and the like.

  In particular, in order to realize a DC brushless motor having a speed control function, a method using a crystal oscillator as a speed cycle reference signal as in Patent Document 2 is generally known. Moreover, an example of a DC motor (motor with a DC brush) whose speed is controlled based on the frequency of a commercial AC power source as disclosed in Patent Document 3 is disclosed. These disclosed technologies require that a DC power source for driving the motor needs to be prepared outside the motor. In particular, in the technology of Patent Document 3, if the frequency of the commercial AC power source changes, a DC motor There is a problem that the number of rotations changes.

  An example of speed control of a DC brushless motor will be specifically described with reference to FIGS.

  FIG. 13 shows a configuration example of a conventional DC brushless motor. The motor unit 4 includes a stator 3 having a driving winding and a mover 2, and a plurality of power elements 5 a to 5 d for supplying driving power to the stator 3. A power unit 6 comprising 5f, a power control unit 7 for controlling the driving power of the power unit 6, a position signal generating unit 8 for generating a signal corresponding to the position of the mover 2, and a rotational speed of the mover 2 are controlled. A speed control unit 9 that generates a speed control signal to be transmitted, and a terminal unit 10 to which a DC power supply unit 17 is input.

  The power control unit 7 receives the mover position signal generated by the position signal generation unit 8 and the speed control signal output from the speed control unit 9, and turns on / off the plurality of power elements 5a to 5f according to the mover position signal. The mover 2 is driven by control, and the energization amount of the plurality of power elements 5a to 5f is controlled by the speed control signal to accelerate and decelerate the rotation speed of the mover 2.

  The speed controller 9 outputs the actual rotation output from the rotation speed detector 14 based on the speed reference signal that is a frequency-divided signal of the crystal oscillator output unit 16 and the mover position signal output from the position signal generator 8. The number signal is compared by the comparison unit 13 and a speed control signal is output from the control amplifier unit 15 to the power control unit 7 according to the comparison result.

  FIG. 14 shows the operation of the speed controller of the conventional DC brushless motor.

  A speed reference signal output by frequency division from the crystal oscillator output unit 16 and an actual rotational speed signal output from the rotational speed detection unit 14 based on the mover position signal output from the position signal generator 8 Are compared by the comparison unit 13. The output of the comparison unit 13 is transmitted to the power control unit 7 through the control amplifier unit 15 as an acceleration / deceleration command. The power control unit 7 controls the energization amounts of the plurality of power elements 5 a to 5 f of the power unit 6 according to the acceleration / deceleration command of the control amplifier unit 15. As a result, the voltage or current applied to the stator 3 is controlled, and the mover 2 can be moved at a desired rotational speed.

  In section B of FIG. 14, since the period t2 of the actual rotation speed signal output from the rotation speed detection section 14 is longer than the period t0 of the speed reference signal output from the crystal oscillator output section 16, the comparison section 13 determines that the rotation speed is slow. Then, an “H” level signal is output, and an acceleration speed control signal is output from the control amplifier unit 15 to the power control unit 7. As a result, the power control unit 7 operates to increase the energization amount of the power unit 6 and increase the rotational speed. In section C, since the period t3 of the actual rotational speed signal is short, the comparison unit 13 determines that the rotational speed is fast and outputs an “L” level signal, and sends a deceleration speed control signal from the control amplifier unit 15 to the power control unit. 7 is output. As a result, the power control unit 7 operates so as to decrease the energization amount of the power unit 6 and reduce the rotational speed. In this way, the speed control is performed so that the speed cycle reference signal and the actual rotation speed cycle substantially coincide. Approximate coincidence means that acceleration and deceleration commands are repeated and controlled so that the difference between the speed reference signal and the actual rotation speed signal converges to zero. This means that the deceleration is stabilized so as to reach a desired rotational speed by repeating the command. The section A shows a state where the period t0 of the speed reference signal and the period t1 of the actual rotational speed signal completely coincide with each other, but the state of the section A maintaining the state where there is no acceleration / deceleration command is actually Will not happen.

JP-A-52-28152 JP-A-1-164287 JP 59-52228 A

However, since the above conventional method is based on the assumption of a DC power supply input, it is not configured to be compatible with an AC power input such as a commercial AC power supply, and a crystal oscillator is used as a speed control reference signal. It is expensive to realize a DC brushless motor as a replacement for an AC induction motor used in home appliances. Further, since the frequency of the commercial AC power supply varies by 50/60 Hz depending on the region, there is a problem that fluctuations in the rotational speed of the motor affect performance such as operation and efficiency of the device.

  The present invention solves the above-described conventional problems, and provides an AC input DC brushless motor that can directly input an AC power source such as a commercial AC power source and can be driven at a speed corresponding to the frequency of the commercial power source. Is. In other words, the present invention provides a high-efficiency and inexpensive AC-input DC brushless motor that can be directly connected to a commercial AC power supply and inherits the convenience of an induction motor that is driven at a rotational speed corresponding to the frequency.

  In addition, the AC input DC brushless motor that realizes a motor whose rotational speed does not change regardless of the regional difference in the frequency of the commercial AC power supply and can be driven without impairing the efficiency performance of the equipment with a stable rotational speed in any region is provided. To do.

  An AC input DC brushless motor according to the present invention includes a motor unit having at least a single-phase or multiple-phase drive winding and a mover, a plurality of power elements for supplying drive power to the drive winding, A power control unit that controls the driving power of the power element, a position signal generation unit that generates a mover position signal corresponding to a position of the mover, a speed control unit that generates a speed control signal of the mover, A power supply unit that receives the mover position signal and the speed control signal, and performs power on / off control according to the mover position signal. The power element is selected from the power element to drive the mover, and the energization amount of the plurality of power elements is controlled by the speed control signal. The speed control unit is input to the terminal unit. Output the speed control signal for controlling the speed of the mover based on the frequency of the commercial AC power supply to the power control unit, the motor unit, the plurality of power elements, and the power control unit, The position signal generation unit and the speed control unit are at least built-in, and are driven at a speed corresponding to the frequency of the commercial power supply by connecting a commercial AC power supply to the terminal unit.

  As a result, it is possible to realize a highly efficient and inexpensive AC input DC brushless motor that can be directly connected to a commercial AC power supply and inherits the convenience of an induction motor driven at a rotational speed corresponding to the frequency.

  Moreover, the speed change part which can be switched so that the speed | velocity | rate of a needle | mover with the case where the frequency of commercial alternating current power supply is 50 Hz and 60 Hz may become the same desired speed is provided.

  Thereby, it is possible to realize an AC input DC brushless motor that can be driven at a stable rotational speed even in a region where the frequency of the commercial power source is different and does not impair the efficiency performance of the device.

  In addition, a brushless motor unit having at least a single-phase or multiple-phase drive winding and a mover, a plurality of power elements for supplying drive power to the drive winding, and controlling the drive power of the plurality of power elements Power control unit, a position signal generation unit that generates a mover position signal according to the position of the mover, a speed control unit that generates a speed control signal of the mover, and a terminal to which commercial AC power is input The power control unit receives the mover position signal and the speed control signal, selects a power element that performs on / off control based on the mover position signal from the plurality of power elements, and moves the power control unit. And a power control unit for controlling the energization amount of the plurality of power elements by the speed control signal. The speed control unit changes a frequency of a commercial AC power source input to the terminal unit. And a speed control signal for controlling the speed of the mover based on the frequency information signal whose fluctuation is reduced or ignored by the stabilization section is output to the power control section. The brushless motor unit, the plurality of power elements, the power control unit, the position signal generation unit, and the speed control unit are built in at least, and a commercial AC power supply is connected to the terminal unit. Therefore, the stabilization unit is configured to be driven at a speed corresponding to the frequency of the commercial power source, and the speed is not affected by the frequency fluctuation of the commercial AC power source by the stabilizing unit.

  As a result, even if there are voltage fluctuations or frequency fluctuations of the commercial power supply due to deterioration of the power supply situation, the AC input DC brushless motor that suppresses fluctuations in the rotational speed and does not affect the operation and performance of the device on which the motor is mounted Can be realized.

  The AC input DC brushless motor of the present invention can be directly connected to a commercial AC power source, and realizes the convenience of the induction motor that is driven at the number of rotations according to the power frequency and the high efficiency performance of the DC brushless motor at low cost. can do. In addition, there is an effect that an AC input DC brushless motor that can be driven at a stable rotational speed even in a region where the frequency of the commercial power source is different and does not impair the efficiency performance of the device can be realized. Furthermore, even when there are voltage fluctuations and frequency fluctuations of the commercial power supply due to the deterioration of the power supply situation, there is an effect that the rotation speed fluctuation is suppressed and the operation and performance of the device on which the motor is mounted are not affected. Then, in applications such as home appliances where induction motors have been mainly used so far, replacement with higher-efficiency DC brushless motors can be promoted, and the energy-saving performance of devices equipped with these motors can be improved.

The figure which showed the structure of Embodiment 1 of this invention The figure explaining operation | movement of Embodiment 1 of this invention The figure which showed the structure of Embodiment 2 of this invention The figure explaining operation | movement of Embodiment 2 of this invention The figure which showed the structure of Embodiment 3 of this invention The figure explaining operation | movement of Embodiment 3 of this invention The figure which showed the structure of Embodiment 4 of this invention The figure explaining operation | movement of Embodiment 4 of this invention The figure which showed the structure of Embodiment 5 of this invention The figure explaining operation | movement of Embodiment 5 of this invention Figure of example of position signal generator using Hall element of the present invention Diagram of an example of a position signal generator using the shunt resistor of the present invention The figure which showed the structural example of the conventional DC brushless motor The figure explaining operation in the example of composition of the conventional DC brushless motor

  Embodiment 1 of the present invention will be described below with reference to the drawings. However, the present invention is not limited to the following embodiment.

  FIG. 1 is a diagram showing a configuration of an AC input DC brushless motor according to Embodiment 1 of the present invention, and FIG. 2 is a diagram showing its operation.

  A DC brushless motor with an AC input according to the first embodiment shown in FIG. 1 includes a stator 3 having drive windings, a motor unit 4 having a mover 2, and power elements such as a plurality of MOSFETs for supplying driving power to the stator 3. The power unit 6 composed of 5a to 5f, the power element 5a, the power element 5b, the power element 5c, the power element 5d, the power element 5e, the power control unit 7 for controlling the driving power by the power element 5f, and the position of the mover 2 A position signal generating unit 8 that generates a mover position signal according to the speed, a speed control unit 9 that generates a speed control signal for the mover 2, a terminal unit 10 to which the commercial AC power source 1 is input, and a commercial AC power source 1 And an AC / DC conversion unit 11 that converts the voltage into a DC voltage.

  The power control unit 7 receives the mover position signal and the speed control signal, selects a power element for on / off control from the plurality of power elements 5a to 5f based on the mover position signal, and energizes the mover position signal. 2 is driven, and the energization amount of the power element is controlled by the speed control signal.

  The speed control unit 9 outputs a speed control signal for controlling the speed of the mover 2 to the power control unit 7 based on the frequency of the commercial AC power supply 1 input to the terminal unit 10.

  Here, the motor unit 4, the power unit 6 including a plurality of power elements 5 a to 5 f, the power control unit 7, the position signal generation unit 8, the speed control unit 9, the terminal unit 10, and the AC / DC conversion unit 11. And an AC input DC brushless motor that is driven at a speed corresponding to the frequency of the commercial power source by connecting the commercial AC power source 1 to the terminal unit 10. Note that the AC / DC converter may or may not have a smoothing capacitor.

  FIG. 2 shows the operation of the speed control unit 9 in particular with respect to the operation of the above-described AC input DC brushless motor.

  The frequency detection unit 12 takes in the power supply frequency of the commercial AC power supply 1 and outputs the frequency as a speed reference signal. The rotation speed detector 14 processes the mover position signal corresponding to the position of the mover 2 output from the position signal generator 8 and outputs the cycle as an actual rotation speed signal. The speed reference signal and the actual rotational speed signal are compared by the comparison unit 13. The output of the comparison unit 13 is subjected to processing such as phase compensation for amplification and control stabilization by the control amplifier unit 15, and is transmitted to the power control unit 7 as an acceleration command or a deceleration command. The power control unit 7 controls the energization amount of the plurality of power elements 5 a to 5 f of the power unit 6 by the output from the control amplifier unit 15, and controls the applied voltage or current of the stator 3 to drive the mover 2. .

  In the section B of FIG. 2, the period t0 of the speed reference signal output from the frequency detection unit 12 and the period t2 of the actual rotation speed signal output from the rotation speed detection unit 14 are compared. Since t2 is longer, the comparison unit 13 determines that the rotational speed of the motor is slow, and outputs an “H” level signal. As a result, the control amplifier unit 15 outputs an acceleration command. In section C, the period t3 of the actual rotational speed signal is short, and the comparison unit 13 determines that the rotational speed of the motor is fast and outputs an “L” level signal. As a result, the control amplifier unit 15 outputs a deceleration command. In this way, the cycle of the speed reference signal corresponding to the frequency of the commercial AC power supply 1 is movable so that the cycle of the actual rotational speed signal output from the rotational speed detector based on the mover position signal is substantially the same. The speed of the child is controlled. Approximate coincidence means that acceleration and deceleration commands are repeated and controlled so that the difference between the speed reference signal and the actual rotation speed signal converges to zero. This means that the deceleration is stabilized so as to reach a desired rotational speed by repeating the command. The section A shows a state in which the period of the speed reference signal and the period of the actual rotational speed signal completely coincide with each other. However, the state of the section A that maintains the state in which there is no acceleration / deceleration command actually occurs. Absent.

  Next, a second embodiment of the present invention will be described with reference to FIGS.

  FIG. 3 is a diagram showing a configuration of an AC input DC brushless motor according to the second embodiment of the present invention, and FIG. 4 is a diagram showing the operation thereof.

  The AC input DC brushless motor of the second embodiment in FIG. 3 is different from the one shown in the first embodiment in FIG. 1 in that the comparison unit 13 forming the speed control unit 9 is a discrimination unit 22 and the other is the same. It is a configuration.

  3 is rotated based on a speed reference signal having a period or frequency corresponding to the frequency of the commercial AC power supply 1 and a mover position signal output from the position signal generator 8. A discriminator 22 for discriminating whether the period difference or frequency difference with the period or frequency of the actual rotational speed signal output from the number detector 14 is outside the desired range or within the desired range; .

  When the determination unit 22 determines that the range is out of the range, the speed control signal is increased or decreased in the direction toward the desired range, and the energization amount of the plurality of power elements 5a to 5f of the power unit 6 applied to the stator 3 is controlled to be movable. The child 2 is accelerated or decelerated.

  When the discriminating unit 22 discriminates within the desired range, the increase / decrease of the speed control signal is stopped, and the energization amount to the power elements 5a to 5f of the power unit 6 applied to the stator 3 is fixed, so that the movable element A speed of 2 is maintained.

  Thereby, the speed of the mover 2 is adjusted so that the period difference or frequency difference between the speed reference signal corresponding to the frequency of the commercial AC power supply 1 and the actual rotation speed signal output from the rotation speed detection unit is within a desired range. Be controlled.

  FIG. 4 is a diagram for explaining the operation of the second embodiment.

  The frequency detection unit 12 takes in the power supply frequency of the commercial AC power supply 1 and outputs the frequency as a speed reference signal. The rotation speed detector 14 processes the mover position signal corresponding to the position of the mover 2 output from the position signal generator 8 and outputs the cycle as an actual rotation speed signal. The discriminator 22 determines whether the difference between the cycle of the speed reference signal and the cycle of the actual rotational speed signal is within a desired range.

  For example, in section B in FIG. 4, it is determined that the period difference t2-t0 between the period t0 of the speed reference signal and the period t2 of the actual rotational speed signal exceeds the upper limit value α of the desired range, and the rotational speed of the motor is slow. The determination unit 22 outputs an “H” level determination signal indicating “slow”. Accordingly, the control amplifier unit 15 transmits an acceleration command as a speed control signal to the power control unit 7, increases the energization amount of the plurality of power elements 5 a to 5 f of the power unit 6, and the voltage or current applied to the stator 3. Is increased to accelerate the mover 2.

  Further, in section C of FIG. 4, the period difference t3-t0 between the period t0 of the speed reference signal and the period t3 of the actual rotational speed signal is less than the lower limit value −α of the desired range, and it is determined that the rotation speed of the motor is fast. The discriminator 22 outputs an “L” level discriminant signal meaning “fast”. Accordingly, the control amplifier unit 15 transmits a deceleration command as a speed control signal to the power control unit 7, reduces the energization amount of the power unit 6, decreases the voltage or current applied to the stator 3, and moves the mover 2. Slow down.

  In this way, the period difference or frequency difference between the period of the speed reference signal corresponding to the frequency of the commercial AC power supply 1 and the period of the actual revolution number signal output from the revolution number detection unit falls within a desired range. Thus, the speed of the mover 2 is controlled.

  In section A, the period difference t1-t0 between the period t0 of the speed reference signal and the period t1 of the actual rotational speed signal is within a desired range (between −α and α). Is output within the range, and the control amplifier unit 15 transmits to the power control unit 7 a command for stopping the increase / decrease of the speed control signal and maintaining the state of the previous speed control signal. The state is shown in which the energizing amount is fixed and the rotational speed of the mover 2 is maintained.

  In the second embodiment, the determination unit 22 is used to operate and maintain the output of the control amplifier unit 15 when the rotational speed of the motor is within a desired range. Thus, there is no need for processing such as phase compensation, and the configuration can be simplified as compared with the first embodiment. The first embodiment is different from the first embodiment in that the state can be maintained without performing a minute acceleration / deceleration command if the difference between the speed reference signal and the actual rotational speed signal is within a desired range. There is actually an A section in which the command state is maintained.

  Next, Embodiment 3 of the present invention will be described with reference to FIGS.

  FIG. 5 is a diagram showing a configuration of an AC input DC brushless motor according to the third embodiment of the present invention, and FIG. 6 is a diagram showing its operation.

  The AC input DC brushless motor of Embodiment 3 of FIG. 5 differs from that shown in Embodiment 1 of FIG. 1 in that a frequency division / multiplication speed switching unit 23 is provided. Other than that, the configuration is the same. The frequency division / multiplication speed switching unit 23 divides or multiplies the frequency of the commercial AC power supply 1 to an arbitrary period or frequency. With this configuration, a speed reference signal having an arbitrary period or frequency is generated, It can be driven at any rotational speed.

  FIG. 6 shows the state of the operation.

  Next, a fourth embodiment of the present invention will be described with reference to FIGS.

  FIG. 7 is a diagram showing a configuration of an AC input DC brushless motor according to Embodiment 4 of the present invention, and FIG. 8 is a diagram showing its operation.

  The AC input DC brushless motor of Embodiment 4 in FIG. 7 differs from that shown in Embodiment 1 of FIG. 1 in that a 50/60 Hz speed switching unit 24 having a changeover switch 25 is provided. Other than that, the configuration is the same.

  For example, when the frequency of the commercial AC power source in the area where the motor is used is 50 Hz, the changeover switch 25 is set to the 50 Hz side. When used in a 60 Hz area, the changeover switch 25 is set on the 60 Hz side. Here, since the period of the commercial AC power supply is 0.83 times in the 60 Hz region as compared with the 50 Hz region, in order to make the motor rotation speed in the 50 Hz region and the motor rotation speed in the 60 Hz region the same speed. By generating a speed reference signal having a period 1.2 times that of the commercial AC power supply 1 in the 60 Hz region, it can be driven at the same rotational speed as in the 50 Hz region.

  As described above, the brushless motor according to the fourth embodiment generates a speed reference signal having a cycle that is 1.2 times the cycle of the commercial power frequency when the changeover switch 25 is set to the 60 Hz side as compared with the case where the changeover switch 25 is set to the 50 Hz side. It works to do. Further, when the changeover switch 25 is set to the 50 Hz side, it operates so as to generate a speed reference signal having a cycle of the commercial power supply frequency. Thereby, the period of the speed reference signal input to the comparison unit 13 is the same period regardless of whether the commercial power supply period is 50 Hz or 60 Hz, and the motor can be driven at the same rotational speed. Thereby, it is possible to realize an AC input DC brushless motor that can be driven at a stable rotational speed even in a region where the frequency of the commercial power source is different and does not impair the efficiency performance of the device.

  FIG. 8 shows the state of the operation.

  In the fourth embodiment, the changeover switch is usually set on the 50 Hz side mainly for use in the 50 Hz region, and in the special case of use in the 60 Hz region, the changeover switch 25 is set on the 60 Hz side, and the commercial AC power supply is set. When the speed reference signal is generated with a period 1.2 times longer and the changeover switch 25 is set to the 50 Hz side, the speed reference signal with the period of the commercial AC power supply is generated. The changeover switch is usually set on the 60 Hz side, and the changeover switch 25 is set on the 50 Hz side in the special case of using in the 50 Hz region, and the speed reference is 1 / 1.2 times the cycle of the commercial AC power supply. When a signal is generated and the changeover switch 25 is set to the 60 Hz side, a speed reference signal having a cycle of the commercial AC power supply may be generated.

  Next, a fifth embodiment of the present invention will be described with reference to FIGS.

FIG. 9 is a diagram showing a configuration of an AC input DC brushless motor according to the fifth embodiment of the present invention, and FIG. 10 is a diagram showing its operation.
The AC input DC brushless motor of the fifth embodiment of FIG. 9 differs from that shown in FIG. 7 in that it includes an automatic 50/60 Hz speed switching unit 26 that eliminates the commercial AC power frequency switching switch 25.

  The automatic 50/60 Hz speed switching unit 26 has an operation of automatically discriminating the frequency difference between 50 Hz and 60 Hz depending on the area of the commercial AC power supply. For automatic discrimination of 50/60 Hz, as shown in FIG. 10, for example, when a pulse train of 0.1 ms is counted and counted 180 pulses or more, it is automatically recognized as 50 Hz, and when only 180 pulses or less are counted, it is set as 60 Hz. This can be achieved by automatic recognition. Generation of a pulse train of 0.1 ms can be realized by using, for example, an inexpensive CR oscillator and pulse measurement using an 8-bit counter or the like.

  Thus, in the fifth embodiment, in addition to the effects of the fourth embodiment shown in FIG. 7, an AC input DC brushless motor that is more convenient and can be driven at a stable rotational speed independent of regional differences in commercial power supply frequency is realized. it can.

  11 and 12 are specific examples of the position signal generator 8 that generates a signal corresponding to the position of the mover 2, FIG. 11 shows an example using a Hall element, and FIG. 12 uses a shunt resistor 20. In this example, it is used for position sensorless driving or the like, and includes an OP amplifier 21. Further, as shown in FIG. 11, a Hall element 18 and a comparator 19 are provided.

  As described above, the AC input DC brushless motor of the present invention can be directly connected to a commercial AC power supply and is driven at a rotational speed corresponding to the power supply frequency, and the high efficiency performance of the DC brushless motor. Can be realized at low cost. In addition, there can be achieved an AC input DC brushless motor that can be driven at a stable rotational speed even in regions where the frequency of the commercial power source is different and does not impair the efficiency performance of the device.

  In addition, although it described as a DC brushless motor above, according to another name, it may be described as a DC brushless motor. Similarly, although described as AC input, according to another name, it may be described as AC input.

  The AC input DC brushless motor of the present invention can be used for home appliances such as air conditioners in which induction motors have been mainly used so far. In these devices, replacement with higher efficiency DC brushless motors is promoted. This can contribute to the improvement of energy saving performance of equipment equipped with these motors.

DESCRIPTION OF SYMBOLS 1 Commercial AC power supply 2 Movable element 3 Stator 4 Motor part 5a, 5b, 5c, 5d, 5e, 5f Power element 6 Power part 7 Power control part 8 Position signal generation part 9 Speed control part 10 Terminal part 11 AC / DC conversion Section 12 Frequency detection section 13 Comparison section 14 Rotation speed detection section 15 Control amplifier section 16 Crystal oscillator output section 17 DC power supply section 18 Hall element 19 Comparator 20 Shunt resistor 21 OP amplifier 22 Discriminating section 23 Frequency division / multiplication speed switching section 24 50 / 60Hz speed switching part 25 changeover switch 26 automatic 50 / 60Hz speed switching part

Claims (6)

A motor unit having at least a single-phase or multiple-phase driving winding and a mover, a plurality of power elements for supplying driving power to the driving winding, and power control for controlling the driving power of the plurality of power elements A position signal generating unit that generates a mover position signal corresponding to the position of the mover, a speed control unit that generates a speed control signal of the mover, and a terminal unit to which commercial AC power is input. Prepared,
The power control unit receives the mover position signal and the speed control signal, selects a power element that performs on / off control based on the mover position signal from the plurality of power elements, and drives the mover. , Controlling the energization amount of the plurality of power elements by the speed control signal,
The speed control unit outputs the speed control signal for controlling the speed of the mover to the power control unit based on the frequency of the commercial AC power input to the terminal unit,
The motor unit, the plurality of power elements, the power control unit, the position signal generation unit, and the speed control unit are built in at least, and the frequency of the commercial power supply is connected by connecting the commercial AC power source to the terminal unit. AC input DC brushless motor driven at a speed corresponding to The speed control unit includes a detection unit that detects a frequency difference or a phase difference between the commercial AC power supply and the mover position signal. The speed control signal is increased or decreased by the output of the detection unit, and the frequency of the commercial AC power supply and the movable 2. The DC brushless motor according to claim 1, wherein the speed of the mover is controlled so that the frequency according to the child position signal substantially coincides. The speed control unit includes a determination unit that determines whether the frequency difference between the commercial AC power source and the mover position signal is outside a desired range or within a desired range, and the determination unit has determined that the frequency difference is out of the range. In this case, the speed control signal is increased or decreased in the direction toward the desired range to accelerate or decelerate the mover, and when the determination unit determines that it is within the desired range, the increase or decrease of the speed control signal is stopped to move the movable element. 2. The DC brushless motor according to claim 1, wherein the speed of the mover is controlled by maintaining the speed of the child so that a frequency difference between the commercial AC power source and the mover position signal is within a desired range. The speed controller detects the speed of the mover from the frequency of the mover position signal, divides or multiplies the frequency of the commercial AC power supply or the frequency of the mover position signal, and switches the mover to any desired speed. The DC brushless motor according to claim 1, further comprising a speed switching unit. 5. The DC brushless motor according to claim 4, further comprising a speed switching unit capable of switching so that the speed of the mover between the case where the frequency of the commercial AC power supply is 50 Hz and the case where the frequency is 60 Hz is the same desired speed. The speed control unit includes an automatic detection unit that automatically detects whether the frequency of the commercial AC power supply is 50 Hz or 60 Hz, and the same desired regardless of whether the frequency of the commercial AC power supply is 50 Hz or 60 Hz The DC brushless motor according to claim 5, wherein the speed switching unit is switched so that the speed becomes the following speed.

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