JP7190333B2 - MOTOR DRIVE CONTROL DEVICE, ELECTRONIC DEVICE, AND MOTOR CONTROL METHOD - Google Patents

Description

The present invention relates to a motor drive control device, an electronic device, and a motor control method, and more particularly to a motor drive control device, an electronic device, and a motor control method having an advance control function.

2. Description of the Related Art Generally, a motor drive control device having an advance angle control function for efficiently driving a motor is used. Such a motor drive control device is widely used, for example, for driving motors used in electronic devices having air blowing functions such as air cleaners, humidifiers, dehumidifiers, and air conditioners. The motor drive control device drives the motor so that the rotation speed (number of rotations) of the motor matches the target rotation speed. At this time, the motor is efficiently driven by performing advance angle control in which the phase is advanced by an amount corresponding to the rotation speed of the motor and the drive voltage is applied to the coil of the motor.

Japanese Unexamined Patent Application Publication No. 2002-200002 discloses a motor control device that controls the motor rotation speed based on a set target rotation speed for a motor that drives a load device having load pulsation that is synchronized with the rotation of the motor.

JP 2009-27923 A

By the way, in an electronic device having a motor as described above, resonance occurs at a specific rotation speed due to the relationship between the natural frequency of the motor and the natural frequency of the members constituting the electronic device, and large vibrations occur. There is Therefore, for example, when changing the rotation speed of the motor from the first rotation speed to the second rotation speed, if the rotation speed at which resonance occurs is crossed over, a large vibration may occur temporarily. The rotation speed at which resonance occurs differs depending on the combination of the motor and the members forming the electronic device.

SUMMARY OF THE INVENTION The present invention has been made to solve such problems, and it is an object of the present invention to provide a motor drive control device, an electronic device, and a motor control method capable of suppressing the generated vibration.

According to one aspect of the present invention to achieve the above object, a motor drive control device is a motor drive control device for controlling a rotation speed of a motor with respect to a target rotation speed of the motor, and A control unit that outputs a signal for controlling the rotation speed of the motor to the motor, and a motor drive unit that applies a voltage to the motor according to the signal, the control unit has a phase adjustment unit that adjusts the phase of the voltage, The phase of the voltage that raises or lowers the rotational speed of the motor toward the target rotational speed lags behind the phase of the voltage that maintains the rotational speed of the motor at the target rotational speed.

According to another aspect of the present invention, a motor drive control device includes a control unit that outputs a signal to cause the motor to rotate at the target rotation speed according to the target rotation speed and the rotation speed of the motor; a motor drive unit that applies voltage to the motor; the control unit has a phase adjustment unit that adjusts the phase of the voltage; and the phase adjustment unit increases or decreases the rotation speed of the motor according to the target rotation speed. In this case, adjustment is made to delay the phase of the voltage more than in the case of maintaining the rotation speed of the motor according to the target rotation speed.

Preferably, the phase adjustment unit adjusts whether to delay the phase of the voltage or not, based on a comparison result between the target rotation speed and the rotation speed of the motor.

Preferably, after changing the target rotation speed, the control unit outputs a signal corresponding to the changed target rotation speed, and the phase adjustment unit delays the phase of the voltage according to the changed target rotation speed.

Preferably, the phase adjustment unit performs voltage advance control so that the induced voltage in the coil of the motor becomes smaller during a period in which the rotation speed of the motor is maintained according to the target rotation speed.

Preferably, the phase adjuster delays the phase of the voltage by setting the phase of the voltage to a predetermined set value.

Preferably, the phase adjuster sets the phase of the voltage that reduces the magnitude of the winding current flowing through the coil of the motor, and delays the phase of the voltage.

According to still another aspect of the present invention, an electronic device includes a motor, the motor drive control device described above for driving the motor, and an impeller that rotates together with the rotor of the motor.

According to still another aspect of the present invention, a motor control method is a motor control method for controlling a rotation speed of a motor with respect to a target rotation speed of the motor, wherein the rotation speed of the motor is adjusted to the target rotation speed of the motor. A signal output step of outputting a control signal to the motor; a first phase adjustment step of adjusting the phase of the voltage for maintaining the rotation speed of the motor according to the target rotation speed; and adjusting the phase of the second voltage for delaying the phase of the voltage that raises or lowers the rotational speed of the motor with respect to the phase of the voltage that maintains the rotational speed of the motor at the target rotational speed.

According to still another aspect of the present invention, a motor control method includes: a control unit that outputs a signal to cause the motor to rotate at the target rotation speed according to the target rotation speed and the rotation speed of the motor; A motor control method using a motor drive control device comprising a motor drive unit for applying a voltage to the motor, wherein advance angle control of the voltage is performed when maintaining the rotation speed of the motor according to a target rotation speed. When the rotational speed of the motor is increased or decreased in accordance with the first advance control step and the target rotation speed, the phase of the voltage is higher than when the advance control is performed by the first advance control step. and a second advance angle control step of performing advance angle control so as to lag behind.

According to these inventions, it is possible to provide a motor drive control device, an electronic device, and a motor control method capable of suppressing generated vibration.

1 is a perspective view showing an electronic device according to one embodiment of the present invention; FIG. 1 is a block diagram showing a circuit configuration of a motor drive control device according to an embodiment; FIG. 1 is a diagram showing a circuit configuration of a motor drive control device according to this embodiment; FIG. 3 is a block diagram showing the configuration of a control circuit unit; FIG. It is a figure explaining an example of operation|movement of a motor drive control apparatus. 5 is a flowchart showing an example of the operation of the motor drive control device according to the present embodiment regarding advance angle control; 7 is a flowchart showing an example of advance angle control switching processing; 9 is a flow chart showing an example of an operation related to advance angle control of a motor drive control device according to a first modified example of the present embodiment; FIG. 11 is a flowchart showing an example of an operation regarding advance angle control of a motor drive control device according to a second modified example of the present embodiment; FIG. FIG. 11 is a block diagram showing the configuration of a control circuit section of a motor drive control device according to a third modified example of the present embodiment;

An electronic device using a motor drive control device according to one embodiment of the present invention will be described below. Note that the rotational speed is a concept including the number of revolutions (rpm).

[Embodiment]

FIG. 1 is a perspective view showing an electronic device according to one embodiment of the invention.

As shown in FIG. 1, electronic device 10 is, for example, an air cleaner. The electronic device 10 is provided with a suction port 11 for sucking indoor air and an exhaust port 12 for exhausting the air sucked from the suction port 11 . That is, the electronic device 10 sucks air from the suction port 11 and exhausts it from the exhaust port 12 . The suction port 11 is arranged near the ground surface of the electronic device 10 , and the exhaust port 12 is arranged above the electronic device 10 .

Inside the electronic device 10, for example, a filter 13, an impeller 14, a motor 20, and a motor drive control device 1 are provided.

The motor 20 is driven by driving power supplied by the motor drive control device 1 . The rotor of motor 20 rotates with impeller 14 .

The impeller 14 rotates as the rotor of the motor 20 rotates, thereby sucking air from the outside of the electronic device 10 through the suction port 11 and discharging the sucked air through the exhaust port 12 .

The filter 13 is, for example, a purifying filter, a humidifying filter, a deodorizing filter, or the like. The filter 13 is arranged in the air guide path so that the air sucked from the suction port 11 passes through the filter 13 before reaching the impeller 14 . The air sucked from the suction port 11 is cleaned by passing through the filter 13 inside the electronic device 10 and then discharged from the exhaust port 12 .

The electronic device 10 includes a host device 50 (shown in FIG. 3) and an operation panel 51 (shown in FIG. 3). When the user operates the operation panel 51, the host device 50 controls the motor drive control device 1 accordingly. Thereby, the electronic device 10 operates according to the user's operation. By operating the operation panel 51, the user can set the volume of air to be cleaned in stages (low speed, medium speed, high speed, etc.). In addition, it is possible to set the air volume to be automatically changed according to conditions such as air pollution.

In the present embodiment, when an operation to select an air volume stage (low speed (low rotation speed), medium speed (medium rotation speed), high speed (high rotation speed), etc.) is performed on the operation panel 51, the selected A target rotation speed (target rotation speed) is set corresponding to the stage. That is, the host device 50 outputs a target rotation speed signal Sc corresponding to the set air volume to the motor drive control device 1 . The motor drive control device 1 drives the motor 20 at a rotation speed corresponding to the input target rotation speed signal Sc, as will be described later. That is, the host device 50 controls the motor drive control device 1 by outputting the target rotation speed signal Sc to the motor drive control device 1 .

FIG. 2 is a block diagram showing the circuit configuration of the motor drive control device 1 according to this embodiment.

As shown in FIG. 2, in this embodiment, the motor 20 is, for example, a three-phase brushless motor. The motor drive control device 1 is configured to drive the motor 20 by, for example, a sine wave drive method. The motor drive control device 1 outputs a sine wave drive signal to the motor 20 to periodically drive the coils Lu, Lv, and Lw of the motor 20 in a sine wave shape (a wave obtained by synthesizing a sine wave and a wave different from a sine wave). , the motor 20 is rotated. Note that the driving method of the motor 20 is not limited to this.

The motor drive control device 1 includes a motor drive section 2 having an inverter circuit 2a and a predrive circuit 2b, a control circuit section (an example of a control section) 3, and an FG signal generation section 4. FIG. The components shown in FIG. 2 are part of the entire motor drive control device 1, and the motor drive control device 1 has other components in addition to those shown in FIG. You may have

In the present embodiment, the motor drive control device 1 is an integrated circuit device (IC) that is entirely packaged except for the FG signal generator 4 . That is, in the motor drive control device 1 , the motor drive section 2 is integrated together with the control circuit section 3 . Part of the motor drive control device 1 may be packaged as one integrated circuit device, or all or part of the motor drive control device 1 may be packaged together with other devices to form one integrated circuit device. A circuit arrangement may be configured.

The inverter circuit 2a constitutes the motor driving section 2 together with the pre-drive circuit 2b. The inverter circuit 2a energizes the coils Lu, Lv, Lw of the motor 20 based on the output signals Vuu, Vul, Vvu, Vvl, Vwu, Vwl output from the predrive circuit 2b. In the inverter circuit 2a, for example, pairs of series circuits of two switch elements provided at both ends of the power supply Vcc are arranged for each phase (U phase, V phase, W phase) of the coils Lu, Lv, and Lw. configured. In each pair of two switch elements, a terminal of each phase of the motor 20 is connected to a connection point between the switch elements.

The pre-drive circuit 2b, under the control of the control circuit section 3, generates six types of output signals corresponding to the switch elements of the inverter circuit 2a for driving the inverter circuit 2a, and outputs the output signals to the inverter circuit 2a. . The predrive circuit 2b generates output signals Vuu, Vul, Vvu, Vvl, Vwu, and Vwl based on the drive control signal Sd output from the control circuit section 3. FIG. In the inverter circuit 2a, switching elements corresponding to the respective output signals Vuu, Vul, Vvu, Vvl, Vwu, and Vwl perform ON/OFF operations. As a result, drive voltages are applied to the coils Lu, Lv, and Lw of the motor 20 .

FIG. 3 is a diagram showing the circuit configuration of the motor drive control device 1 according to this embodiment.

As shown in FIG. 3 , the FG signal generator 4 generates a real rotational speed signal Sr and outputs it to the control circuit 3 . The actual rotation speed signal Sr is a signal corresponding to the actual rotation speed of the motor 20 (rotation speed of the rotor; hereinafter sometimes referred to as the actual rotation speed). In this embodiment, the actual rotation speed signal Sr is the FG signal. That is, the FG signal generator 4 has, for example, an FG pattern 4a, which is a coil pattern formed on a substrate arranged near the rotor of the motor 20 . The FG signal generator 4 generates and outputs an actual rotation speed signal Sr according to the induced voltage of the FG pattern 4a. Note that the actual rotation speed signal Sr is not limited to the signal generated in this manner. For example, the actual rotation speed signal Sr may be an FG signal generated based on the output of a Hall element or a Hall IC, or a frequency corresponding to the rotation speed of the motor 20 generated using an encoder or the like. It may be a signal having the characteristics of

In this embodiment, the control circuit unit 3 controls the operation of the motor 20 by outputting a drive control signal Sd for driving the motor 20 to the motor drive unit 2 to control the motor drive unit 2 .

The control circuit unit 3 receives the actual rotational speed signal Sr, the target rotational speed signal Sc, and the winding current signal Si.

The target rotation speed signal Sc is, for example, a clock signal output from a clock terminal of the host device 50 . The target rotation speed signal Sc is a signal with a frequency corresponding to the target rotation speed of the motor 20 . In other words, the target rotation speed signal Sc is information corresponding to a target value (target rotation speed) of the rotation speed of the motor 20 for instructing at what Hz (rpm) the motor 20 should be rotated.

The winding current signal Si is, for example, a signal that indicates the magnitude of the winding current of the motor 20 . In the present embodiment, the winding current signal Si is a voltage signal corresponding to the magnitude of the winding current flowing through the U-phase coil Lu of the motor 20, but is not limited thereto. It may correspond to the magnitude of the current, or it may correspond to the magnitude of the winding currents of all three phases.

The control circuit section 3 generates a drive control signal Sd based on the actual rotation speed signal Sr, the target rotation speed signal Sc, and the winding current signal Si, and outputs it to the pre-drive circuit 2b of the motor drive section 2. . The control circuit unit 3 drives and controls the motor 20 to rotate at the target rotation speed according to the target rotation speed indicated by the target rotation speed signal Sc and the rotation speed of the motor 20 indicated by the actual rotation speed signal Sr. Rotation control of the motor 20 is performed by outputting the signal Sd to the motor drive unit 2 . The motor drive unit 2 outputs a sine wave drive signal to the motor 20 based on the drive control signal Sd to drive the motor 20 .

The control circuit unit 3 outputs the drive control signal Sd so that the actual rotation speed of the motor 20 follows the target rotation speed corresponding to the target rotation speed signal Sc. That is, when the target rotation speed is constant, the drive control signal Sd is generated so that the actual rotation speed becomes the target rotation speed even if the load of the motor 20 fluctuates due to changes in the environment around the electronic device 10 or the like. output and adjust the magnitude of the drive voltage applied to the motor 20 . When the target rotation speed is changed (for example, when an operation to change from "low speed" to "medium speed" is performed on the operation panel 51), or when the motor 20 temporarily falls into a locked state, the locked state In the case of recovery, etc., the deviation between the target rotation speed and the actual rotation speed is relatively large. By adjusting the magnitude of the driving voltage applied, the motor 20 is accelerated or decelerated.

In this embodiment, the control circuit section 3 includes a speed control circuit 31 , a sine wave drive circuit 32 and a winding current detection circuit 40 .

The winding current detection circuit 40 outputs winding current information CL indicating the magnitude of the winding current according to the input winding current signal Si.

A target rotation speed signal Sc and an actual rotation speed signal Sr are input to the speed control circuit 31 . The speed control circuit 31 generates a torque command signal S1 so that the motor 20 follows the target rotation speed according to the comparison result between the target rotation speed signal Sc and the actual rotation speed signal Sr. The torque command signal S1 is a signal corresponding to the magnitude of the torque of the motor 20. FIG. If there is a deviation between the target rotation speed and the actual rotation speed, the torque command signal S1 is adjusted. That is, the rotation speed of the motor 20 is adjusted by feedback control.

The sine wave drive circuit 32 receives the winding current information CL and the torque command signal S1. The sine wave drive circuit 32 generates a drive control signal Sd based on the torque command signal S1 and outputs it to the motor drive section 2 . As a result, the motor drive unit 2 applies drive voltages to the phase coils Lu, Lv, and Lw of the motor 20 at timings corresponding to the rotation of the motor 20 so that the motor 20 rotates at a torque corresponding to the torque command signal S1. applied. As will be described later, the sine wave drive circuit 32 has a protection function that controls power supply to the motor 20 according to the winding current information CL so that the winding current does not become too large.

FIG. 4 is a block diagram showing the configuration of the control circuit section 3. As shown in FIG.

The configuration and operation of the control circuit section 3 will be described in more detail below.

In this embodiment, the control circuit unit 3 adjusts the phase of the drive voltage applied to the motor 20 . That is, the control circuit unit 3 controls the advance angle of the drive voltage applied to the motor 20 . The advance angle control is performed by a phase adjustment section 33 which is composed of part of the speed control circuit 31 and part of the sine wave drive circuit 32 of the control circuit section 3 .

The speed control circuit 31 has a lead angle determination circuit 34 and a speed change detection circuit 35 . Lead angle determination circuit 34 and speed change detection circuit 35 are included in phase adjustment unit 33 .

The sine wave drive circuit 32 has a sine wave generation circuit 32 b , a first lead angle controller 36 , a second lead angle controller 37 , a selector 38 and a brake circuit 39 . First advance control section 36 , second advance control section 37 , and selector 38 are included in phase adjustment section 33 .

The sine wave generation circuit 32b generates and outputs a drive control signal Sd corresponding to each phase of the motor 20 based on the torque command signal S1. The sine wave generation circuit 32b generates the drive control signal Sd so that the drive voltages are applied to the coils Lu, Lv, and Lw of the motor 20 in phases according to the processing result of the phase adjuster 33. FIG.

Winding current information CL is input to the brake circuit 39 . The brake circuit 39 compares the winding current information CL with a predetermined threshold, and limits the magnitude of the current applied to the coils Lu, Lv, and Lw of the motor 20 when the winding current becomes too large. control. The brake circuit 39 may be configured to perform control to stop the motor 20 when the winding current becomes too large.

As described above, the phase adjustment unit 33 includes the advance angle determination circuit 34 and the speed change detection circuit 35 of the speed control circuit 31, the first advance angle control unit 36 and the second advance angle control unit 37 of the sine wave drive circuit 32. , and a selector 38 .

In the present embodiment, when the rotational speed of the motor 20 is increased or decreased according to the target rotational speed (when the motor 20 is accelerated or decelerated), the phase adjustment unit 33 adjusts the speed of the motor 20 according to the target rotational speed. Control is performed to delay the phase of the drive voltage (control to reduce the advance angle) compared to when the rotational speed is maintained. In other words, when the deviation between the rotation speed of the motor 20 and the target rotation speed is relatively large because the target rotation speed is changed or the load fluctuates rapidly, the target rotation speed is constant and the motor 20 rotates. Control is performed to delay the phase of the drive voltage more than when the difference between the speed and the target rotation speed is relatively small. The phase adjustment unit 33 switches whether to perform such control for delaying the phase of the drive voltage based on the comparison result between the target rotation speed and the rotation speed of the motor 20 . That is, the phase adjustment unit 33 adjusts whether the phase of the drive voltage is delayed or not, based on the comparison result between the target rotation speed and the rotation speed of the motor 20 . The phase of the drive voltage that increases or decreases the rotation speed of the motor 20 toward the target rotation speed lags behind the phase of the drive voltage that maintains the rotation speed of the motor 20 at the target rotation speed.

More specifically, when the rotation speed of the motor 20 is maintained according to the target rotation speed, the phase adjustment unit 33 controls the advance angle so that the induced voltages of the coils Lu, Lv, and Lw of the motor 20 are reduced. I do. In other words, the phase adjustment unit 33 performs advance control with emphasis on efficiency so that the motor 20 can be efficiently driven with low power consumption. On the other hand, when the target rotation speed is changed, the phase adjustment unit 33 performs control to delay the phase of the drive voltage when increasing or decreasing the rotation speed of the motor 20 so as to follow the changed target rotation speed. . That is, the phase adjustment unit 33 drives in a state in which the induced voltages of the coils Lu, Lv, and Lw of the motor 20 become relatively large, so that the current flowing through the coils Lu, Lv, and Lw becomes relatively small. advance angle control. After changing the target rotation speed, the control circuit unit 3 outputs a signal corresponding to the changed target rotation speed, and the phase adjustment unit 33 delays the phase of the drive voltage according to the changed target rotation speed.

An actual rotation speed signal Sr is input to the advance angle determination circuit 34 . The lead-angle determination circuit 34 determines a preset lead-angle value (the amount by which the phase to which the drive voltage is applied is advanced from the phase of the rotor) according to the rotational speed of the motor 20 . The lead-angle determination circuit 34 determines the lead-angle value by selecting, for example, a lead-angle value corresponding to the actual rotation speed from a preset combination of the rotation speed and the lead-angle value corresponding thereto. can be done. The lead-angle determination circuit 34 may calculate the lead-angle value corresponding to the actual rotational speed according to a preset calculation rule. The lead-angle determination circuit 34 outputs information about the determined lead-angle value as a lead-angle value signal S2.

A target rotation speed signal Sc is input to the speed change detection circuit 35 . A speed change detection circuit 35 detects that the target rotation speed has been changed based on the target rotation speed signal Sc, and outputs a selection signal S3 according to the detection result. In this embodiment, the selection signal S3 is a signal that becomes a predetermined voltage when the target rotation speed is changed, but it is not limited to this.

A lead-angle value signal S<b>2 is input to the first lead-angle control unit 36 . The first lead-angle control unit 36 controls the sine wave generation circuit 32b to advance the phase by the lead-angle value determined by the lead-angle determination circuit 34 according to the lead-angle value signal S2. It outputs the control signal S4. That is, the first advance control section 36 outputs a first advance control signal S4 for performing advance control with emphasis on efficiency. In other words, the first advance angle control unit 36 performs advance angle control so that the induced voltage in the coils of the motor 20 is reduced.

The second lead-angle control unit 37 outputs a second lead-angle control signal S5 for controlling the sine wave generation circuit 32b to advance the phase by a predetermined lead-angle value. The second advance-angle control unit 37 performs the second advance-angle control so that the advance-angle control is performed with a lead-angle value smaller than the advance-angle value when the first advance-angle control unit 36 performs the advance-angle control with emphasis on efficiency. An angle control signal S5 is output. That is, the second advance angle control section 37 outputs the second advance control signal S5 for performing advance control for reducing the winding current. In other words, the second advance control section 37 performs advance control so that the phase of the drive voltage lags behind that when the first advance control is being performed by the first advance control section 36 .

In the present embodiment, the second advance control section 37 outputs the second advance control signal S5 based on information stored in advance in the memory 37b. For example, the second lead-angle control unit 37 outputs the second lead-angle control signal S5 so that the lead-angle control is performed by applying the lead-angle value stored in advance in the memory 37b. That is, the second advance angle control section 37 sets the phase of the driving voltage based on the predetermined setting value stored in the memory 37b. When delaying the phase of the drive voltage, the second advance control section 37 sets the phase of the drive voltage to a predetermined set value to delay the phase of the drive voltage.

The selector 38 receives the first lead-angle control signal S4, the second lead-angle control signal S5, and the selection signal S3. The selector 38 outputs either the first lead-angle control signal S4 or the second lead-angle control signal S5 to the sine wave generation circuit 32b according to the selection signal S3. In other words, the selector 38 selects whether to perform the advance control by the first advance control section 36 or the advance control by the second advance control section 37 .

In this embodiment, the selector 38 causes the first advance angle control unit 36 to perform advance angle control when maintaining the rotation speed of the motor 20 according to the target rotation speed. When the rotation speed of the motor 20 is increased or decreased, the second advance angle control section 37 performs advance angle control. In other words, the selector 38 causes the first advance angle control unit 36 to perform advance angle control while the rotation speed of the motor 20 is maintained according to the target rotation speed, and the motor 20 is adjusted according to the target rotation speed. Advance angle control by the second advance angle control unit 37 is performed during the period in which the rotation speed of is being increased or decreased. Such an operation of the selector 38 is performed according to the selection signal S3 output from the speed change detection circuit 35. FIG.

FIG. 5 is a diagram for explaining an example of the operation of the motor drive control device 1. FIG.

In FIG. 5, transitions of the target rotational speed, the rotational speed of the motor 20, the advance angle, and the winding current are schematically shown from the top.

Before time t11, when the target rotational speed is 200 rpm (revolutions per minute), the actual rotational speed becomes 200 rpm, and control is performed to maintain the actual rotational speed in that state. At this time, the first lead-angle control unit 36 performs lead-angle control emphasizing efficiency, and the motor 20 is driven such that the lead-angle value corresponding to 200 rpm is, for example, 10 degrees, and the efficiency is improved. be improved.

Assume that the operation panel 51 is operated to change the target rotational speed from 200 rpm to 1000 rpm at time t11. At this time, since the actual rotational speed is 200 rpm, the motor 20 is accelerated and controlled so that the actual rotational speed becomes 1000 rpm. At this time, slow acceleration control is performed so that the actual rotational speed of the motor 20 gradually increases, and the actual rotational speed reaches 1000 rpm at time t12 after a certain amount of time has passed. Note that the slow acceleration control may not be performed.

In the present embodiment, when the motor 20 is accelerated from the time t11 to the time t12, the selector 38 operates in response to the selection signal S3, so that the second advance angle control section 37, which emphasizes quietness, can advance the motor 20. Angle control is performed. That is, from time t11 to time t12, a smaller lead-angle value (for example, 2 degrees) is temporarily applied than when the lead-angle control emphasizing efficiency is performed, and the phase of the drive voltage is lower than before time t11. Become slow. Therefore, the amplitude of the waveform of the winding current (solid line) when the advance control is performed by the second advance control unit 37 is the same as the waveform of the winding current (solid line) when the advance control is performed with emphasis on efficiency. ), the winding current is reduced, and the noise is reduced.

After time t12 when the actual rotational speed reaches the target rotational speed of 1000 rpm, control is performed so that the rotation is maintained at the target rotational speed. Since the actual rotational speed increases, the magnitude of the winding current becomes greater than before time t11. At this time, the first lead-angle control unit 36 performs lead-angle control with emphasis on efficiency, and the motor 20 is driven such that the lead-angle value corresponding to 1000 rpm is, for example, 25 degrees, and the efficiency is improved. be improved.

FIG. 6 is a flow chart showing an example of the operation of the motor drive control device 1 according to the present embodiment regarding advance angle control.

Since it is configured as described above, the motor drive control device 1 performs operations related to advance angle control as shown in FIG.

That is, in step S11, the speed change detection circuit 35 determines whether or not the target rotation speed signal Sc has been detected. In other words, when the driving of the motor 20 is stopped, the speed change detection circuit 35 determines whether or not a start command for starting the motor 20 has been detected. If the target rotational speed signal Sc has not been detected, it waits until it is detected. When the target rotation speed signal Sc is detected, the process proceeds to step S12.

In step S12, the phase adjustment unit 33 performs advance angle control switching processing.

FIG. 7 is a flow chart showing an example of the advance angle control switching process.

As shown in FIG. 7, in step S31, the speed change detection circuit 35 compares the target rotational speed and the actual rotational speed based on the target rotational speed signal Sc and the actual rotational speed signal Sr, and determines the target rotational speed. and the actual rotation speed is equal to or greater than a predetermined value (for example, a value of 5% of the target rotation speed). The speed change detection circuit 35 outputs a selection signal S3 according to the determination result. That is, if the difference between the target rotation speed and the actual rotation speed is equal to or greater than the predetermined value, the process proceeds to step S32; otherwise, the advance angle control switching process ends.

In step S32, the phase adjustment unit 33 performs control so that driving is performed with advance angle control for reducing the winding current. That is, in response to the selection signal S3 output from the speed change detection circuit 35, the selector 38 outputs the second lead angle control signal S5 output from the second lead angle control section 37 to the sine wave generation circuit 32b. As a result, advance control is performed to reduce the winding current, and the motor 20 is driven to rotate at the target rotation speed.

In step S33, the speed change detection circuit 35 compares the target rotational speed and the actual rotational speed based on the target rotational speed signal Sc and the actual rotational speed signal Sr, and the difference between the target rotational speed and the actual rotational speed is determined. It is determined whether or not it is less than a predetermined value (for example, a value of 5% of the target rotational speed). The speed change detection circuit 35 outputs a selection signal S3 according to the determination result. That is, when the difference between the target rotation speed and the actual rotation speed is not less than the predetermined value, the process returns to step S32, and the advance angle control for reducing the winding current is continued. If the difference between the target rotation speed and the actual rotation speed is less than the predetermined value, the advance angle control switching process is terminated.

After the lead-angle control switching process is performed, returning to FIG. 6, in step S13, driving is performed under lead-angle control with an emphasis on efficiency. That is, in response to the selection signal S3 output from the speed change detection circuit 35, the selector 38 outputs the first lead angle control signal S4 output from the first lead angle control section 36 to the sine wave generation circuit 32b. As a result, advance control is performed with emphasis on efficiency, and the motor 20 is driven to rotate at the target rotational speed.

In step S14, the speed change detection circuit 35 determines whether or not a change in the target rotation speed has been detected. That is, when the input target rotational speed signal Sc is changed, the speed change detection circuit 35 determines that the change in the target rotational speed has been detected, and proceeds to step S15. Otherwise, go to step S16.

In step S15, the phase adjustment unit 33 performs advance angle control switching processing. The advance angle control switching process is performed as described above, and when the process of step S15 ends, the process returns to step S13. That is, when the target rotation speed is changed, the second When the state is switched to the state in which advance control is performed by the binary advance control unit 37, and the difference between the target rotation speed after the change and the actual rotation speed becomes less than a predetermined value, the advance control by the first advance control unit 36 is performed. Return to what is done.

In step S16, the speed change detection circuit 35 determines whether or not it has detected that the input of the target rotational speed signal Sc has been stopped. When it is detected that the input of the target rotational speed signal Sc has been stopped, the process proceeds to step S17. Otherwise, return to step S13.

In step S17, the phase adjustment unit 33 performs advance angle control switching processing. The advance angle control switching process is performed as described above, and when the process of step S17 ends, the process proceeds to step S18. until the difference becomes less than a predetermined value (in other words, while the rotational speed of the motor 20 is decreasing), the state is switched to the state in which the second advance angle control section 37 performs advance angle control.

In step S18, the sine wave drive circuit 32 starts a free-run stop operation. That is, the electric power supplied to each phase of the motor 20 is turned off, and the motor 20 is stopped. When the operation of step S18 ends, a series of operations ends.

As described above, according to the present embodiment, while the target rotation speed is being changed and the motor 20 is accelerating or decelerating, the advance angle control by the first advance control section 36 is changed to the second step. Since the advance angle control is performed by the binary advance angle control unit 37, the winding current becomes relatively small, and the magnitude of vibration generated as the motor 20 rotates becomes small. Therefore, while the motor 20 is accelerating or decelerating, the electronic device 10 is driven across a rotational speed at which resonance occurs due to the relationship between the natural frequency of the motor 20 and the natural frequency of the members forming the electronic device 10 . Even in such a case, the magnitude of vibration generated at the rotational speed at which resonance occurs is relatively small. Therefore, vibration generated in the electronic device 10 can be suppressed. Vibration can be reduced without using a complicated control method such as a vector control method, and the manufacturing costs of the motor drive control device 1 and the electronic device 10 can be kept low.

For example, in the example shown in FIG. 5 described above, when the rotational speed at which resonance occurs is 500 rpm, the motor 20 is rotated across the rotational speed at which resonance occurs while the rotational speed increases from 200 rpm to 1000 rpm. driven. However, since the rotation speed at which resonance occurs is straddled while the second advance control unit 37 is performing advance control, the vibration generated when the rotation speed reaches 500 rpm can be suppressed to a relatively small level. Therefore, the user of the electronic device 10 is less likely to feel uncomfortable with the vibration.

Modifications of this embodiment will be described below. In the following description, the same reference numerals are assigned to the same configurations as those according to the present embodiment, and the description of the similar configurations and operations may be omitted.

[Description of the first modification]

When stopping the motor 20, the advance control by the second advance control section 37 may simply be applied.

FIG. 8 is a flow chart showing an example of the operation of the motor drive control device 1 according to the first modified example of the present embodiment regarding advance angle control.

In FIG. 8, the processing of steps S111 to S116 and the processing of step S118 are the same as the processing of steps S11 to S16 and the processing of step S18 shown in FIG.

In this modification, when it is detected in step S116 that the input of the target rotational speed signal Sc has been stopped, in step S117, the phase adjustment unit 33 simply reduces the winding current instead of performing the advance angle control switching process. control so as to drive with the advance angle control. That is, when it is detected that the input of the target rotation speed signal Sc has been stopped, the selector 38 receives the selection signal S3 output from the speed change detection circuit 35, and the selector 38 outputs from the second advance control section 37. A second lead angle control signal S5 is output to the sine wave generating circuit 32b. After that, the process of step S118 is performed.

Advantages similar to those of the above-described embodiment can also be obtained in the first modification.

[Description of Second Modification]

The advance angle control switching process may be performed not only when the target rotation speed is changed, but also when the motor 20 is started.

FIG. 9 is a flow chart showing an example of the operation of the motor drive control device 1 according to the second modification of the present embodiment regarding the advance angle control.

In FIG. 9, the processing from step S211 to step S213 is the same as the processing from step S11 to step S13 shown in FIG. Further, the processing of step S215 and the processing of step S216 are the same as the processing of step S17 and the processing of step S18 shown in FIG.

In the second modified example, when driving is being performed with advance angle control emphasizing efficiency in step S213, the process of step S14 shown in FIG. 6 is not performed. That is, in step S214, similarly to the processing in step S16, it is determined whether or not the speed change detection circuit 35 has detected that the input of the target rotational speed signal Sc has been stopped. If it is detected that the input of the target rotation speed signal Sc has been stopped, the process proceeds to step S215. If not, the process returns to step S212 and advance angle control switching processing is performed.

That is, in the second modification, the phase adjustment unit 33 is driven by the advance angle control emphasizing efficiency (step S213), and the input of the target rotation speed signal Sc is not stopped (step S214). NO), if the difference between the target rotational speed and the actual rotational speed becomes equal to or greater than a predetermined value (YES in step S31 shown in FIG. 7), the drive is switched to advance angle control for reducing the winding current (see FIG. 7). shown step S32). Then, when the difference between the target rotational speed and the actual rotational speed becomes less than a predetermined value (YES in step S33 shown in FIG. 7), the driving is changed from the advance control for reducing the winding current to the advance control for efficiency. (step S213).

Since such an operation is performed, for example, when a large load is suddenly applied to the motor 20 and the actual rotation speed decreases and the difference between the target rotation speed and the actual rotation speed becomes a predetermined value or more, the target Even in the process of increasing the rotation speed of the motor 20 to the rotation speed, the drive is performed with the advance angle control for reducing the winding current. Therefore, even in such a case, the magnitude of vibration generated at the rotational speed at which resonance occurs can be made relatively small, and vibration generated in the electronic device 10 can be suppressed.

[Description of the third modification]

The phase adjustment unit 33 adjusts the magnitude of the winding current flowing through the coils Lu, Lv, and Lw of the motor 20 when performing control to delay the phase of the drive voltage, that is, when performing drive control by the second advance angle control unit 37. The phase of the driving voltage may be set based on the above. That is, the phase adjustment unit 33 may set the phase of the drive voltage that reduces the magnitude of the winding currents flowing through the coils Lu, Lv, and Lw of the motor 20, and delay the phase of the drive voltage.

FIG. 10 is a block diagram showing the configuration of the control circuit section 3 of the motor drive control device 1 according to the third modification of the present embodiment.

In the third modification shown in FIG. 10, instead of the second advance control section 37 in the above-described embodiment, a slightly different operation is performed to generate the second advance control signal S5. A second advance control section 237 is provided.

The winding current information CL output from the winding current detection circuit 40 is input to the second lead angle control section 237 . The second lead-angle control unit 237 sets the lead-angle value based on the winding current information CL so that the magnitude of the winding current is smaller than a predetermined threshold value. That is, when the magnitude of the winding current is greater than a predetermined threshold value, the winding current is reduced by setting the lead-angle value to be small. As a result, when the phase adjustment unit 33 performs the advance control by the second advance control unit 237, the drive voltage is adjusted so that the magnitude of the winding current is adjusted to match the predetermined threshold value by the feedback control. phase is adjusted. With such a configuration, it is possible to reliably reduce the winding current and suppress vibration occurring in the electronic device 10 while the second advance angle control section 237 is performing the advance control.

[others]

The motor drive control device and the electronic equipment using it are not limited to the circuit configurations shown in the above-described embodiments and modifications thereof. A variety of circuit configurations are applicable that are configured to meet the objectives of the present invention. A motor may be configured by partially combining the features of the above embodiments and modifications. In the embodiments and modifications described above, some components may be omitted or some components may be configured in other manners.

Electronic devices are not limited to air cleaners. The electronic device may be of various types having a configuration such that the impeller is rotated by a motor. For example, the electronic device may be a fan, an air conditioner, or the like, or may be a device having a fan for cooling or ventilation.

The driving method of the motor is not limited to normal sine wave driving, and may be a driving method using a rectangular wave, a driving method using a trapezoidal wave, or a driving method in which a sine wave is specially modulated.

When a change in the target rotation speed is detected, the process of comparing the target rotation speed and the actual rotation speed may not be performed in the advance angle control switching process. For example, when a change in the target rotation speed is detected, driving by advance angle control for reducing the winding current may be performed immediately. Further, it is not necessary to perform the process of comparing the target rotation speed and the actual rotation speed after the driving by the advance angle control for reducing the winding current is started. For example, after a predetermined period of time from the start of drive by advance angle control for reducing the winding current, the drive may be switched to drive by advance control that emphasizes efficiency.

As the target rotation speed signal, a pulse width modulation signal having a duty ratio corresponding to the set air volume may be output from the host device, and the motor drive control device may drive the motor accordingly. Further, the motor drive control device may be configured to drive the motor at a preset target rotation speed and may not receive the target rotation speed signal from an external host device or the like.

In order to detect the position of the rotor, a Hall element may be used, or a Hall IC may be used as a rotor position detector of the motor.

The above-described flowcharts and the like show examples for explaining the operation, and are not limited to these. The steps shown in each drawing of the flowchart are specific examples, and the flow is not limited to this flow. For example, other processing may be inserted between each step, or the processing may be parallelized.

The motor driven by the motor drive control apparatus of the present embodiment is not limited to a three-phase brushless motor, and may be a brushless motor with other number of phases. Also, the type of motor is not particularly limited.

Some or all of the processing in the above-described embodiments may be performed by software or may be performed using hardware circuits. At least a part of each component of the motor drive control device may be processed by software instead of by hardware.

A motor drive controller may be provided within the motor as a component of the motor. In this case, the motor would be equipped with a motor controller.

The above-described embodiments should be considered as illustrative in all respects and not restrictive. The scope of the present invention is indicated by the scope of the claims rather than the above description, and is intended to include all modifications within the scope and meaning equivalent to the scope of the claims.

1 motor drive control device 2 motor drive section 3 control circuit section (an example of a control section)
REFERENCE SIGNS LIST 10 electronic device 14 impeller 20 motor 31 speed control circuit 32 sine wave drive circuit 33 phase adjustment unit 36 first lead angle control unit 37, 237 second lead angle control unit 37b memory 38 selector 50 host device CL winding current information Lu , Lv, Lw coil Sc target rotation speed signal Sd drive control signal Sr actual rotation speed signal Si winding current signal S4 first advance control signal S5 second advance control signal

Claims (13)

A motor drive control device for controlling a rotation speed of a motor with respect to a target rotation speed of the motor,
a control unit that outputs a signal to the motor for controlling the rotation speed of the motor to the target rotation speed of the motor;
a motor driving unit that applies a voltage to the motor according to the signal;
The control unit has a phase adjustment unit that adjusts the phase of the voltage,
the phase of the voltage that raises or lowers the rotational speed of the motor toward the target rotational speed lags behind the phase of the voltage that maintains the rotational speed of the motor at the target rotational speed ;
The phase adjustment unit performs advance angle control of the voltage so that the induced voltage of the coil of the motor becomes smaller during a period in which the rotation speed of the motor is maintained according to the target rotation speed . a control unit that outputs a signal to cause the motor to rotate at the target rotation speed according to the target rotation speed and the rotation speed of the motor;
a motor driving unit that applies a voltage to the motor according to the signal;
The control unit has a phase adjustment unit that adjusts the phase of the voltage,
The phase adjustment unit delays the phase of the voltage when increasing or decreasing the rotation speed of the motor according to the target rotation speed compared to when maintaining the rotation speed of the motor according to the target rotation speed. make adjustments and
The phase adjustment unit performs advance angle control of the voltage so that the induced voltage of the coil of the motor becomes smaller during a period in which the rotation speed of the motor is maintained according to the target rotation speed . A motor drive control device for controlling a rotation speed of a motor with respect to a target rotation speed of the motor,
a control unit that outputs a signal to the motor for controlling the rotation speed of the motor to the target rotation speed of the motor;
a motor driving unit that applies a voltage to the motor according to the signal;
The control unit has a phase adjustment unit that adjusts the phase of the voltage,
the phase of the voltage that raises or lowers the rotational speed of the motor toward the target rotational speed lags behind the phase of the voltage that maintains the rotational speed of the motor at the target rotational speed ;
The motor drive control device , wherein the phase adjustment unit delays the phase of the voltage by setting the phase of the voltage that reduces the magnitude of the winding current flowing through the coil of the motor. a control unit that outputs a signal to cause the motor to rotate at the target rotation speed according to the target rotation speed and the rotation speed of the motor;
a motor driving unit that applies a voltage to the motor according to the signal;
The control unit has a phase adjustment unit that adjusts the phase of the voltage,
The phase adjustment unit delays the phase of the voltage when increasing or decreasing the rotation speed of the motor according to the target rotation speed compared to when maintaining the rotation speed of the motor according to the target rotation speed. make adjustments and
The motor drive control device , wherein the phase adjustment unit delays the phase of the voltage by setting the phase of the voltage that reduces the magnitude of the winding current flowing through the coil of the motor. 5. The phase adjustment unit according to any one of claims 1 to 4, wherein the phase adjustment unit adjusts whether the phase of the voltage is delayed or not, based on a comparison result between the target rotation speed and the rotation speed of the motor. Motor drive controller. After changing the target rotation speed, the control unit outputs a signal corresponding to the changed target rotation speed,
6. The motor drive control device according to claim 1 , wherein said phase adjustment unit delays the phase of said voltage according to said changed target rotation speed. 5. The phase adjustment unit performs advance angle control of the voltage so that the induced voltage of the coil of the motor becomes smaller during a period in which the rotation speed of the motor is maintained according to the target rotation speed. The motor drive control device according to 1. 8. The motor drive control device according to claim 1 , wherein said phase adjustment unit delays the phase of said voltage by setting the phase of said voltage to a predetermined set value. a motor;
A motor drive control device according to any one of claims 1 to 8 , which drives the motor;
and an impeller that rotates together with the rotor of the motor. A motor control method for controlling a rotation speed of a motor with respect to a target rotation speed of the motor,
a signal output step of outputting to the motor a signal for controlling the rotation speed of the motor to the target rotation speed of the motor;
a first phase adjustment step of adjusting the phase of the voltage for maintaining the rotation speed of the motor according to the target rotation speed;
a phase of the voltage that increases or decreases the rotational speed of the motor toward the target rotational speed with respect to a phase of the voltage that maintains the rotational speed of the motor at the target rotational speed; and a phase adjustment step ,
A method of controlling a motor, comprising advancing control of the voltage so that the induced voltage in the coil of the motor is reduced during a period in which the rotation speed of the motor is maintained according to the target rotation speed . a control unit that outputs a signal to cause the motor to rotate at the target rotation speed according to the target rotation speed and the rotation speed of the motor;
A motor control method using a motor drive control device including a motor drive unit that applies a voltage to the motor according to the signal,
a first advance angle control step of performing advance angle control of the voltage when maintaining the rotation speed of the motor according to the target rotation speed;
When the rotation speed of the motor is increased or decreased in accordance with the target rotation speed, the phase of the voltage is advanced so as to lag behind the phase of the voltage when the advance control is performed by the first advance control step. and a second advance angle control step for performing control ,
A method of controlling a motor, comprising advancing control of the voltage so that the induced voltage in the coil of the motor is reduced during a period in which the rotation speed of the motor is maintained according to the target rotation speed . A motor control method for controlling a rotation speed of a motor with respect to a target rotation speed of the motor,
a signal output step of outputting to the motor a signal for controlling the rotation speed of the motor to the target rotation speed of the motor;
a first phase adjustment step of adjusting the phase of the voltage for maintaining the rotation speed of the motor according to the target rotation speed;
a phase of the voltage that increases or decreases the rotational speed of the motor toward the target rotational speed with respect to a phase of the voltage that maintains the rotational speed of the motor at the target rotational speed; and a phase adjustment step ,
A method of controlling a motor , wherein in the step of adjusting the phase of the second voltage, the phase of the voltage is set to reduce the magnitude of the winding current flowing in the coil of the motor, and the phase of the voltage is delayed . a control unit that outputs a signal to cause the motor to rotate at the target rotation speed according to the target rotation speed and the rotation speed of the motor;
A motor control method using a motor drive control device including a motor drive unit that applies a voltage to the motor according to the signal,
a first advance angle control step of performing advance angle control of the voltage when maintaining the rotation speed of the motor according to the target rotation speed;
When the rotation speed of the motor is increased or decreased in accordance with the target rotation speed, the phase of the voltage is advanced so as to lag behind the phase of the voltage when the advance control is performed by the first advance control step. and a second advance angle control step for performing control ,
The motor control method , wherein, in the step of adjusting the phase of the second voltage, the phase of the voltage is set to reduce the magnitude of the winding current flowing in the coil of the motor, and the phase of the voltage is delayed .

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