JP2024019904A - Motor drive controller, motor unit, and motor drive control method - Google Patents

Abstract

To achieve both reduction in starting time and improved vibration after starting.SOLUTION: A motor drive controller 10 comprises a control circuit part 3 that switches electrification patterns of three-phase coils Lu, Lv, Lw electrified with a motor drive part 2 in a predetermined order by outputting a drive control signal Sd to the motor drive part 2 for selectively electrifying the three-phase coils Lu, Lv, Lw of a motor 20. The control circuit part 3 has: an electrification switching signal production part 35 that produces an electrification switching signal S6 for switching the electrification patterns to the three-phase coils Lu, Lv, Lw of the motor 20 in timing determined with either a 180 degree section or a 360 degree section of a positional detection signal Shu as a reference according to a rotation state of the motor 20; and a drive control signal production part 33 that produces a PWM signal S4 for performing sine wave driving of the motor 20 as the drive control signal Sd by switching the electrification patterns based on the electrification switching signal S6.SELECTED DRAWING: Figure 1

Description

The present invention relates to a motor drive control device, a motor unit, and a motor drive control method.

In sine wave driving of a motor, a drive signal (PWM signal) with a predetermined duty ratio for each PWM cycle is generated every 360 electrical degrees, and by turning on and off a switching element, the coil current of the motor is driven by a sine wave. It is controlled to have a waveform.

The generation timing of a drive signal with a predetermined duty ratio for every 360 degrees of electrical angle is determined from the change time of the position detection signal immediately before being output from a position detector that detects the position of the rotor of the motor. The position detection signal changes every 60 electrical degrees when there are three position detectors, but every 180 electrical degrees or every 360 degrees when there is one position detector. Measure the section, calculate the electrical angle of 60 degrees, and realize sine wave drive.

Conventionally, one Hall element is used as a position detector, and the energizing phase of the motor is switched based on the timing obtained every period of 180 degrees/n of electrical angle or 360 degrees/n of electrical angle of the Hall signal output by the Hall element. A motor drive circuit that performs this is known (for example, Patent Document 1).

Japanese Patent Application Publication No. 2006-20440

In the motor drive circuit of Patent Document 1, when switching the energizing phase of the motor, the timing of 60 degrees of electrical angle is determined based on which of the 180 degrees of electrical angle section and the 360 degrees of electrical angle section of the Hall signal. ) is not specifically mentioned.

The inventor investigated the switching of the energized phase of the motor, and found that the electrical angle of 60 degrees was determined based on the 180 degree electrical angle section, and the case that the electrical angle of 60 degrees was determined based on the 360 degree electrical angle section. We found that there are the following differences in each.

In other words, when using a 180 degree section, the rotational speed of the immediately preceding motor (change in position detection signal) can be reflected in the energization, and the followability is higher than when using a 360 degree section, but the duty ratio of the Hall signal is If there is variation, the timing of switching the energization pattern will be shifted, and in that case, the energization will be unstable compared to when using a 360-degree section, and the possibility of vibration will increase.

On the other hand, when using a 360-degree interval, even if the duty ratio of the position detection signal varies, it is possible to calculate 60 degrees by averaging, so the timing of switching the energization pattern is stable, and the vibration is less than when using a 180-degree interval. Although the possibility of this happening is low, since the rotational speed of the immediately preceding motor (change in position detection signal) is averaged, the followability is lower than in the case of using the 180 degree section.

In view of the above differences, we discovered that by switching the motor energization pattern at an electrical angle of 60 degrees determined by an appropriate method, it is possible to both shorten the startup time and improve vibration after startup, and we have developed the present invention. reached.

The present invention is intended to solve the above-mentioned problems, and an object of the present invention is to provide a motor drive control device, a motor unit, and a motor drive control method that can reduce startup time and improve vibration after startup. do.

A motor drive control device according to a typical embodiment of the present invention includes a motor drive section that selectively energizes coils of multiple phases of the motor, and a drive control signal that outputs a drive control signal to the motor drive section. comprising a control circuit unit that switches in a predetermined order the energization pattern of the plurality of phase coils energized by the drive unit, and a position detection signal output unit that outputs a position detection signal corresponding to the position of the rotor of the motor, The control circuit section energizes the plurality of phase coils of the motor at a timing determined based on either a 180 degree section or a 360 degree section of the position detection signal, depending on a rotational state of the motor. an energization switching signal generation unit that generates an energization switching signal for switching patterns; and a energization switching signal generation unit that switches the energization pattern based on the energization switching signal and generates a control signal for driving the motor in a sine wave as the drive control signal. The present invention is characterized by comprising a drive control signal generation section that performs the following steps.

According to one aspect of the present invention, it is possible to both shorten startup time and improve vibration after startup.

FIG. 1 is a diagram showing the configuration of a motor unit 1 including a motor drive control device 10 according to the present embodiment. FIG. 7 is a diagram illustrating an example of a drive signal in 120-degree energization rectangular wave drive. It is a figure which shows an example of the drive signal in sine wave drive. FIG. 3 is a diagram showing an example of a U-phase drive signal and a winding current waveform in sine wave drive. It is a figure showing an example of control operation in motor drive control device 10 concerning this embodiment. It is a figure explaining the relationship between position detection signal Shu and energization switching signal S6. FIG. 3 is a diagram showing an example of the flow of energization control processing in the control circuit unit 3. FIG.

1. Overview of Embodiments First, an overview of typical embodiments of the invention disclosed in this application will be described. In the following description, as an example, reference numerals on the drawings corresponding to constituent elements of the invention are written in parentheses.

[1] A motor drive control device (10) according to a typical embodiment of the present invention includes a motor drive unit (2) that selectively energizes multiple phase coils (Lu, Lv, Lw) of a motor (20). ), a control circuit unit (3) that outputs a drive control signal (Sd) to the motor drive unit to switch the energization pattern of the plurality of phase coils energized by the motor drive unit in a predetermined order; a position detection signal output section (25) that outputs a position detection signal (Shu) corresponding to the position of the rotor of the motor, and the control circuit section outputs the position detection signal (Shu) according to the rotation state of the motor. an energization switching signal generation unit that generates an energization switching signal (S6) for switching the energization pattern to the multi-phase coils of the motor at a timing determined based on either a 180 degree section or a 360 degree section; (35); and a drive control signal generation unit (33) that switches the energization pattern based on the energization switching signal and generates a control signal (S4) for driving the motor in a sine wave as the drive control signal. It is characterized by having the following.

[2] In the motor drive control device according to [1] above, the energization switching signal generation unit determines whether the change timing of the position detection signal and the switching timing of the energization switching signal are synchronized. A timing determined based on the 180 degree interval when the synchronization determination unit and the synchronization determination unit determine that the change timing of the position detection signal and the switching timing of the energization switching signal are not synchronized. generates the energization switching signal, and when the synchronization determination unit determines that the change timing of the position detection signal and the switching timing of the energization switching signal are synchronized, The power supply device may further include a signal generation unit that generates the energization switching signal at a determined timing.

[3] In the motor drive control device according to [2] above, the control circuit unit controls the drive control signal generation unit to control the motor before detecting the position detection signal when starting the motor. After instructing to generate a control signal for driving the rectangular wave as the drive control signal and detecting the position detection signal when starting the motor, the drive control signal generation unit is instructed to generate the drive control signal. The device may further include an energization method instructing section that instructs to generate a control signal for sine wave driving as the drive control signal.

[4] In the motor drive control device according to [3] above, when the drive control signal generation unit receives an instruction from the energization method instruction unit to generate a control signal for driving the motor in a square wave, , a control signal for performing 120 degree energization may be generated as the drive control signal.

[5] A motor unit (1) according to a typical embodiment of the present invention includes the motor drive control device (10) according to any one of [1] to [4] above, and the motor (20). It is characterized by comprising the following.

[6] A motor drive control method according to a typical embodiment of the present invention includes a motor drive section that selectively energizes coils of multiple phases of the motor, and a drive control signal outputted to the motor drive section. , comprising a control circuit unit that switches in a predetermined order the energization pattern of the plurality of phase coils energized by the motor drive unit, and a position detector that outputs a position detection signal corresponding to the position of the rotor of the motor. A motor drive control method using a motor drive control device according to the present invention, wherein the control circuit section is determined based on either a 180 degree section or a 360 degree section of the position detection signal, depending on the rotational state of the motor. A first step of generating an energization switching signal for switching the energization pattern to the coils of multiple phases of the motor at a timing, and driving the motor in a sine wave by switching the energization pattern based on the energization switching signal. The method is characterized in that it includes a second step of generating a control signal for the drive control signal as the drive control signal.

2. Specific Examples of Embodiments Hereinafter, specific examples of embodiments of the present invention will be described with reference to the drawings. In addition, in the following description, the same reference numerals are given to the same component in each embodiment, and repeated description is omitted.

≪Embodiment≫
FIG. 1 is a diagram showing the configuration of a motor unit 1 including a motor drive control device 10 according to the present embodiment.

The motor unit 1 shown in FIG. 1 includes a motor drive control device 10, a motor 20, and a position detector 25 (an example of a position detection signal output section).

Motor 20 is a motor having at least one coil. In the present embodiment, for example, the motor 20 is a brushless DC motor having three-phase (U-phase, V-phase, and W-phase) coils (windings) Lu, Lv, and Lw. The motor 20 functions as one fan motor, for example, by connecting an impeller (not shown) to an output shaft of the motor 20.

The position detector 25 is a device that generates a position detection signal Shu in accordance with the rotation of the rotor of the motor 20. The position detector 25 is, for example, a Hall IC. In the motor unit 1 according to the present embodiment, a Hall IC is provided at a position corresponding to the U-phase coil Lu of the motor 20. The Hall IC detects the magnetic poles of the rotor, converts a signal whose voltage changes according to the rotation of the rotor into a signal that periodically changes high and low, and outputs the signal as a Hall signal. The Hall signal output from the position detector 25 is input to the motor drive control device 10 as a position detection signal Shu.

The motor drive control device 10 is a device that controls the drive of the motor 20. For example, the motor drive control device 10 outputs a drive signal so that the rotational speed of the motor 20 matches the target rotational speed and a rectangular or sinusoidal current flows through the coils Lu, Lv, and Lw of each phase of the motor 20. The motor 20 is driven by controlling the generation.

The motor drive control device 10 includes a control circuit section 3 and a motor drive section 2. The motor drive control device 10 receives a DC voltage from an external DC power source (not shown). For example, the DC voltage is supplied to a power line (not shown) in the motor drive control device 10 via a protection circuit or the like, and is input as a power voltage to the control circuit section 3 and the motor drive section 2 through the power line. Ru.

The motor drive section 2 has an inverter circuit 2a and a predrive circuit 2b.
The inverter circuit 2a has, for example, six switching elements (not shown), and supplies AC power to the three-phase coils Lu, Lv, and Lw of the motor 20. Three high-side switching elements among the six switching elements are arranged on the positive side of the power supply Vcc, and the remaining three low-side switching elements are arranged on the negative side of the power supply Vcc.

Predrive circuit 2b has six output terminals connected to respective gate terminals of six switching elements of inverter circuit 2a. The predrive circuit 2b outputs drive signals Vuh, Vul, Vvh, Vvl, Vwh, and Vwl for each of the six switching elements of the inverter circuit 2a based on the drive control signal Sd output from the control circuit section 3, Controls the on/off operation of switching elements. The drive signals Vuh, Vul, Vvh, Vvl, Vwh, and Vwl are, respectively, a U-phase high-side drive signal, a U-phase low-side drive signal, a V-phase high-side drive signal, a V-phase low-side drive signal, a W-phase high-side drive signal, This is a W-phase low-side drive signal.

The motor drive unit 2 is a circuit that drives the motor 20 based on the drive control signal Sd output from the control circuit unit 3. The drive control signal Sd is a signal for controlling the drive of the motor 20, and is, for example, a PWM signal.

The control circuit unit 3 is a circuit for controlling the operation of the motor drive control device 10 in an integrated manner. In the present embodiment, the control circuit unit 3 includes, for example, a processor such as a CPU, various storage devices such as RAM, ROM, and flash memory, a counter (timer), an A/D conversion circuit, and a D/A conversion circuit. , a clock generation circuit, and peripheral circuits such as an input/output interface circuit are connected to each other via a bus or a dedicated line. For example, the control circuit unit 3 is a microcontroller unit (MCU).

The control circuit section 3 and the motor drive section 2 may be packaged as a single semiconductor integrated circuit (IC), or may be packaged as separate integrated circuits and mounted on a circuit board. They may be mounted on a circuit board and electrically connected to each other on a circuit board.

The control circuit section 3 performs PWM control. That is, the control circuit unit 3 determines the duty ratio so that the rotational speed of the motor 20 matches the target rotational speed and a rectangular or sinusoidal current flows through the coils Lu, Lv, and Lw of each phase of the motor 20. A PWM signal (an example of a control signal) S4 is generated and output as a drive control signal Sd.

Here, a method of generating the PWM signal S4 in the control circuit section 3 will be explained.
In the motor drive control device 10 of the present embodiment, the control circuit unit 3 generates the PWM signal S4 using different generation methods depending on the rotational state of the motor 20, thereby shortening the startup time and improving vibration after startup. It has a configuration that allows both.

The control circuit unit 3 generates a PWM signal S4 in which the current flowing through the coils Lu, Lv, and Lw of each phase of the motor 20 has a rectangular wave shape (executes rectangular wave drive) until the position detection signal Shu is detected at the time of startup. ), and after detecting the position detection signal Shu at startup, generates a PWM signal S4 in which the current flowing through the coils Lu, Lv, and Lw of each phase of the motor 20 has a sine wave shape (executes sine wave drive).

Here, "the position detection signal Shu was detected at the time of startup" means that the position detection signal Shu was detected in a section where the rotational position of the motor 20 based on the position detection signal Shu could be determined. For example, when detecting the position detection signal Shu in an interval of 180 degrees, it can be determined that the motor 20 has rotated half a rotation, so it can be determined that "the position detection signal Shu was detected at the time of startup." That is, at the time of startup, the control circuit unit 3 causes a rectangular wave current to flow through the coils Lu, Lv, and Lw of each phase of the motor 20 until it detects the position detection signal Shu in an interval of 180 degrees, for example. A PWM signal S4 is generated and rectangular wave driving is performed to output it as a drive control signal Sd.

FIG. 2 is a diagram showing an example of a drive signal in 120-degree energization rectangular wave drive.
FIG. 2 shows the waveform of a drive signal (on/off signal) input to each switching element of the inverter circuit 2a in 120-degree energization rectangular wave drive. That is, from the top to the bottom of FIG. 2, the waveform of the position detection signal Shu, the waveform of the U-phase high-side drive signal Vuh, the waveform of the U-phase low-side drive signal Vul, the waveform of the V-phase high-side drive signal Vvh, The waveform of the phase low-side drive signal Vvl, the waveform of the W-phase high-side drive signal Vwh, and the waveform of the W-phase low-side drive signal Vwl are shown.

FIG. 2 also shows that the energization pattern to the three-phase coils Lu, Lv, and Lw is switched in the order of VU, WU, WV, UV, UW, and VW every 60 degrees. The energization pattern VU is an energization pattern in which the winding current flows from the V-phase coil Lv to the U-phase coil Lu, and the energization pattern WU is an energization pattern in which the winding current flows from the W-phase coil Lw to the U-phase coil Lu. The energization pattern WV is an energization pattern in which the winding current flows from the W-phase coil Lw to the V-phase coil Lv, and the energization pattern UV is an energization pattern in which the winding current flows from the U-phase coil Lu to the V-phase coil Lv. The energization pattern UW is an energization pattern in which the winding current flows from the U-phase coil Lu to the W-phase coil Lw, and the energization pattern VW is an energization pattern in which the winding current flows from the V-phase coil Lv to the W-phase coil. This is an energization pattern that flows to Lw. In the example shown in FIG. 2, the energization pattern to the three-phase coils Lu, Lv, and Lw of the motor 20 is controlled by controlling the drive signals Vuh, Vul, Vvh, Vvl, Vwh, and Vwl every 60 electrical degrees. Control is performed to switch in a predetermined order (in this example, the order of VU, WU, WV, UV, UW, and VW). The energization pattern is switched based on an energization switching signal S6 for switching the energization pattern of the three-phase coils Lu, Lv, and Lw of the motor 20.

In the rectangular wave drive, as shown in FIG. 2, the control circuit unit 3 controls the drive signals Vuh, Vul, Vvh, Vvl, Vwh, and Vwl input to each switching element of the inverter circuit 2a to control the three-phase coil Lu. , Lv, and Lw, the energized phase is switched every 60 electrical degrees. The switching timing of the energization switching signal S6 in the rectangular wave drive is set to a timing of 60 electrical degrees predetermined by a timer inside the control circuit unit 3.

On the other hand, at the time of startup, for example, after the control circuit unit 3 detects the position detection signal Shu in the 180 degree section, a sinusoidal current flows through the coils Lu, Lv, and Lw of each phase of the motor 20. A PWM signal S4 is generated as shown in FIG.

FIG. 3 is a diagram showing an example of a drive signal in sine wave drive.
FIG. 3 shows the waveform of a drive signal (PWM signal) input to each switching element of the inverter circuit 2a in sine wave drive. That is, from the top to the bottom of FIG. 3, the waveform of the position detection signal Shu, the waveform of the U-phase high-side drive signal Vuh, the waveform of the U-phase low-side drive signal Vul, the waveform of the V-phase high-side drive signal Vvh, and the waveform of the V-phase high-side drive signal Vvh. The waveform of the phase low-side drive signal Vvl, the waveform of the W-phase high-side drive signal Vwh, and the waveform of the W-phase low-side drive signal Vwl are shown.

FIG. 4 is a diagram showing an example of a U-phase drive signal and a winding current waveform in sine wave drive.
FIG. 4 shows the waveforms of the drive signal (PWM signal) input to the U-phase switching element and the winding current flowing through the U-phase coil Lu in sine wave driving. That is, from the top to the bottom of FIG. 4, the waveform of the position detection signal Shu, the waveform of the U-phase high-side drive signal Vuh, the waveform of the U-phase low-side drive signal Vul, and the waveform of the winding current flowing in the U-phase coil Lu Waveforms are shown.

As shown in FIG. 4, it can be seen that in the control circuit section 3, a sinusoidal winding current flows through the U-phase coil Lu in response to the U-phase high-side drive signal Vuh and the U-phase low-side drive signal Vul.

In the sine wave drive, the control circuit unit 3 performs PWM so that sinusoidal winding currents whose phases are shifted by 120 degrees from each other flow through the U-phase, V-phase, and W-phase coils Lu, Lv, and Lw of the motor 20. A signal S4 is generated and given to the motor drive unit 2 as a drive control signal Sd. A drive signal (PWM signal) input to each switching element of the inverter circuit 2a is generated, for example, according to a duty value of the PWM signal stored in a waveform table. As shown in FIG. 3, the control circuit unit 3 switches the waveform table used to generate the drive signal (PWM signal) to be input to each switching element of the inverter circuit 2a every 60 electrical degrees. That is, in the example shown in FIG. 3, by switching the waveform table for generating the drive signal (PWM signal) input to each switching element of the inverter circuit 2a six times per cycle every 60 electrical degrees, The energization pattern to the three-phase coils Lu, Lv, and Lw of the motor 20 is controlled to be switched in a predetermined order. Even in the sine wave drive, the energization pattern is switched based on the energization switching signal S6 for switching the energization pattern of the three-phase coils Lu, Lv, and Lw of the motor 20.

In the motor drive control device 10 of the present embodiment, the electrical angle of 60 degrees set as the switching timing of the energization switching signal S6 in the sine wave drive is set in the 180 degree section of the position detection signal Shu according to the rotational state of the motor 20. or a 360 degree interval. That is, when the rotation of the motor 20 is not stable, one-third of the time corresponding to the 180 degree section of the position detection signal Shu is determined as the time of 60 degrees electrical angle, and the motor 20 When the rotation of the position detection signal Shu is stable, one-sixth of the time corresponding to the 360 degree section of the position detection signal Shu is determined as the time of 60 degrees electrical angle, and the energization switching signal S6 is switched. Set as timing.

Whether or not the rotation of the motor 20 is in a stable state can be determined, for example, by using the change timing of the position detection signal Shu and the energization switching signal S6 for switching the energization pattern of the three-phase coils Lu, Lv, and Lw of the motor 20. The determination can be made based on whether or not the switching timing is synchronized with the switching timing. Specifically, the switching timing of the energization switching signal S6 in sine wave driving is the position detection signal Shu while the change timing of the position detection signal Shu and the switching timing of the energization switching signal S6 are not synchronized (asynchronous). The timing is set to 60 degrees in electrical angle, which is determined based on the 180 degree section of The timing is set at an electrical angle of 60 degrees determined based on the section.

For example, the determination as to whether or not the rotation of the motor 20 is in a stable state is determined by determining whether or not the rotation speed of the motor 20 is in a stable state, that is, the difference between the target rotation speed and the actual rotation speed of the motor 20. The determination can be made based on whether or not the value is less than or equal to a predetermined value. Specifically, the switching timing of the energization switching signal S6 in the sine wave drive is determined based on the 180 degree section of the position detection signal Shu while the difference between the target rotational speed and the actual rotational speed of the motor 20 does not become less than the threshold value. While the difference between the target rotational speed and the actual rotational speed of the motor 20 is below the threshold, the timing of the electrical angle of 60 degrees is determined based on the 360 degree section of the position detection signal Shu. It may be set to

When the rotation of the motor 20 is not stable, the switching timing of the energization switching signal S6 in the sine wave drive is set to the timing of 60 electrical degrees determined based on the 180 degree section of the position detection signal Shu. Therefore, the immediately preceding rotational speed of the motor 20 (change in the position detection signal Shu) can be reflected in the energization, and the followability for approaching the target driving state is improved, and as a result, the startup time can be shortened. On the other hand, when the rotation of the motor 20 is stable, the switching timing of the energization switching signal S6 in the sine wave drive is set to the timing of 60 electrical degrees determined based on the 360-degree section of the position detection signal Shu. By doing so, even if the duty ratio of the position detection signal Shu varies, it is possible to calculate an electrical angle of 60 degrees by averaging it, so the timing of switching the energization pattern is stabilized, and as a result, vibrations are suppressed.

FIG. 5 is a diagram showing an example of a control operation in the motor drive control device 10 according to the present embodiment.

FIG. 5 shows a control operation from when the motor 20 is started until the motor 20 is stably rotated. As shown in FIG. 5, the control circuit unit 3 executes rectangular wave driving when starting the motor 20, and executes sine wave driving when detecting the position detection signal Shu for a 180 degree interval. As shown in FIG. 5, the control circuit unit 3 performs the following operations during a period in which the change timing of the position detection signal Shu and the switching timing of the energization switching signal S6 are not synchronized (asynchronous) after switching to sine wave driving. The switching timing of the energization switching signal S6 is set at the timing of 60 electrical degrees determined based on the 180-degree section of the position detection signal Shu, and sine wave driving is performed. Furthermore, as shown in FIG. 5, the control circuit unit 3 controls the position detection signal Shu during the period when the change timing of the position detection signal Shu after switching to the sine wave drive is synchronized with the switching timing of the energization switching signal S6. The switching timing of the energization switching signal S6 is set at the timing of 60 electrical degrees determined based on the 360-degree section in Shu, and sine wave driving is executed.

In this way, in the motor drive control device 10 of the present embodiment, the control circuit unit 3 generates the drive control signal Sd using different generation methods depending on the rotational state of the motor 20, thereby shortening the startup time and The structure is designed to improve vibration after startup.

Hereinafter, a specific configuration example of the control circuit section 3 for realizing the above-mentioned functions will be described in detail. As shown in FIG. 1, the control circuit section 3 includes a rotation speed calculation section 31, a speed command analysis section 32, a drive control signal generation section 33, and an energization method instruction section 34 as functional sections that perform the above-mentioned PWM control. and an energization switching signal generation section 35. Further, the drive control signal generation section 33 includes a PWM command section 331 and a PWM signal generation section 332.

Each of the above-described functional units constituting the control circuit unit 3 is realized, for example, by program processing of an MCU as the control circuit unit 3. Specifically, the processor configuring the MCU as the control circuit unit 3 performs various calculations according to programs stored in the memory and controls each peripheral circuit configuring the MCU, thereby controlling the rotation speed calculation unit. 31, a speed command analysis section 32, a drive control signal generation section 33, an energization method instruction section 34, and an energization switching signal generation section 35 are realized.

The rotation speed calculation unit 31 is a functional unit that calculates the actual rotation speed (actual rotation speed) of the motor 20. For example, the rotation speed calculation unit 31 generates an actual rotation speed signal S2 indicating the actual rotation speed of the motor 20 based on the position detection signal Shu input from the position detector 25 using a known calculation method, and performs drive control. It is output to the PWM command section 331 of the signal generation section 33.

The speed command analysis unit 32 receives, for example, a drive command signal Sc output from a host device (not shown) provided outside the motor drive control device 10. The drive command signal Sc is a signal that indicates a target value for driving the motor 20, and is, for example, a speed command signal that indicates a target rotational speed of the motor 20.

The speed command analysis unit 32 acquires information on the specified target rotation speed by analyzing the drive command signal Sc. For example, when the drive command signal Sc is a PWM signal having a duty ratio corresponding to the target rotational speed, the speed command analysis section 32 analyzes the duty ratio of the drive command signal Sc, and calculates the rotational speed corresponding to the duty ratio. The information is output to the PWM command unit 331 as a target rotational speed signal S1.

The drive control signal generation unit 33 generates a PWM signal S4 with a determined duty ratio so that the actual rotation speed of the motor 20 becomes the target rotation speed, and generates the drive control signal S4 at a desired energization method and desired energization switching timing. Output as Sd. This will be explained in detail below.

The actual rotation signal S2 output from the rotation speed calculation section 31 and the target rotation speed signal S1 corresponding to the drive command signal Sc output from the speed command analysis section 32 are input to the PWM command section 331. Further, the PWM command section 331 receives an energization method instruction signal S5 outputted from the energization method instruction section 34 and an energization switching signal S6 outputted from the energization switching signal generation section 35. The PWM command unit 331 determines the operation amount of the motor 20 to make the actual rotation speed of the motor 20 match the target rotation speed based on the target rotation speed signal S1 and the actual rotation speed signal S2, In order to generate a PWM signal having a duty ratio for use as a manipulated variable in accordance with the timing of the electrical angle of 60 degrees specified by the switching timing of the energization switching signal S6 using the energization method input as the energization method instruction signal S5. A PWM command value S3 is generated.

The PWM signal generation unit 332 generates a PWM signal S4 based on the PWM command value S3 and outputs it as a drive control signal Sd.

The energization method instruction unit 34 performs a rectangular wave drive in which a rectangular wave winding current flows through the coils Lu, Lv, and Lw of each phase of the motor 20 until the position detection signal Shu is detected at the time of startup, and the current is set at the position at the time of startup. After detecting the detection signal Shu, the drive control signal generation unit 33 is instructed to perform a sine wave drive so that a sine wave winding current flows through the coils Lu, Lv, and Lw of each phase of the motor 20. Instruct.

Here, "the position detection signal Shu was detected at the time of startup" means that a level change of the position detection signal Shu was detected twice. That is, when the position detection signal Shu is detected in an interval of 180 degrees, it can be determined that "the position detection signal Shu was detected at the time of startup."

The energization switching signal generation unit 35 generates an energization switching signal S6 having switching timing according to the rotational state of the motor 20. The energization switching signal S6 is a signal for switching the energization pattern to the three-phase coils Lu, Lv, and Lw of the motor 20 in a predetermined order, and the switching timing indicates an electrical angle of 60 degrees. Specifically, the energization switching signal generation unit 35 generates the energization switching signal S6 including information indicating the electrical angle of 60 degrees at a timing predetermined by an internal timer until the position detection signal Shu is detected at the time of startup. generate. After detecting the position detection signal Shu at the time of startup, the energization switching signal generation unit 35 generates an electrical angle determined based on either the 180 degree section or the 360 degree section of the position detection signal Shu, depending on the rotation state. An energization switching signal S6 having a switching timing of 60 degrees is generated.

The energization switching signal generation section 35 includes a timer 351 , a signal generation section 352 , an energization synchronization adjustment section (an example of a synchronization determination section) 353 , and an electrical angle instruction section 354 . The timer 351 counts the time required to define a predetermined electrical angle 60, and outputs a notification to that effect to the signal generation unit 352 every time it counts 60 degrees of electrical angle.

The signal generation unit 352 generates the energization switching signal S6 having the switching timing set to the timing of 60 electrical degrees received from the timer 351 until the signal generation unit 352 detects the position detection signal Shu at the time of startup.

After detecting the position detection signal Shu at the time of startup, the signal generation unit 352 uses the 180 degree section of the position detection signal Shu instead of the 60 degree electrical angle timing received from the timer 351, depending on the rotational state of the motor 20. Alternatively, an energization switching signal S6 having a switching timing set to a timing of 60 electrical degrees determined based on any one of the 360-degree sections is generated. Specifically, the signal generation section 352 generates the energization switching signal S6 having the switching timing set to the timing determined based on the electrical angle generation reference instruction signal S8 output from the electrical angle instruction section 354. The electrical angle generation reference instruction signal S8 is a signal that includes an instruction as to whether the 180 degree section or the 360 degree section of the position detection signal Shu is to be used as a reference for determining the electrical angle of 60 degrees.

When the signal generation unit 352 receives the electrical angle generation standard instruction signal S8 including an instruction to set the electrical angle of 60 degrees as a reference on the 180 degree section of the position detection signal Shu, the signal generation section 352 sets the electrical angle of 60 degrees as a reference on the 180 degree section of the position detection signal Shu. The timing of the electrical angle of 60 degrees is determined, and the energization switching signal S6 having the switching timing set to the determined timing is generated.

When the signal generation unit 352 receives the electrical angle generation standard instruction signal S8 including an instruction to set the electrical angle of 60 degrees as a reference on the 360 degree section of the position detection signal Shu, the signal generation section 352 sets the electrical angle of 60 degrees as a reference on the 360 degree section of the position detection signal Shu. The timing of the electrical angle of 60 degrees is determined, and the energization switching signal S6 having the switching timing set to the determined timing is generated.

The electrical angle instruction unit 354 generates an electrical angle generation standard including an instruction as to whether to generate the 60 degree electrical angle based on the 180 degree section or the 360 degree section of the position detection signal Shu, depending on the rotational state of the motor 20. An instruction signal S8 is generated.

For example, the electrical angle instruction unit 354 determines the electrical angle of 60 degrees based on either the 180 degree interval or the 360 degree interval in the position detection signal Shu, based on the synchronization notification signal S7 generated by the energization synchronization adjustment unit 353. An electrical angle generation reference instruction signal S8 including an instruction as to whether to perform the electrical angle generation is generated. The synchronization notification signal S7 is a signal including synchronization presence/absence information, which is information as to whether or not the change timing of the position detection signal Shu and the switching timing of the energization switching signal S6 are synchronized.

The synchronization presence/absence information included in the synchronization notification signal S7 is one type of information indicating whether or not the rotation of the motor 20 is in a stable state. In this embodiment, the rotational state of the motor 20 is determined based on whether the rotational state of the motor 20 is stable based on the criterion of whether or not the change timing of the position detection signal Shu and the switching timing of the energization switching signal S6 are synchronized. However, the present invention is not limited to this. When determining whether or not the rotation of the motor 20 is in a stable state based on other criteria, the synchronization notification signal S7 is a signal that includes other information indicating whether or not the rotation of the motor 20 is in a stable state. can be used.

When the electrical angle instruction unit 354 receives a synchronization notification signal S7 from the energization synchronization adjustment unit 353 indicating that the change timing of the position detection signal Shu and the switching timing of the energization switching signal S6 are synchronized, the electrical angle instruction unit 354 It determines that the rotation is in a stable state, generates an electrical angle generation standard instruction signal S8 including an instruction to base the generation of an electrical angle of 60 degrees on the 360 degree section of the position detection signal Shu, and generates an energization switching signal. The output signal is output to the signal generating section 352 of the section 35.

If the electrical angle instruction unit 354 receives a synchronization notification signal S7 from the energization synchronization adjustment unit 353 indicating that the change timing of the position detection signal Shu and the switching timing of the energization switching signal S6 are not synchronized, the electrical angle instruction unit 354 It determines that the rotation is not in a stable state, generates an electrical angle generation standard instruction signal S8 including an instruction to base the generation of an electrical angle of 60 degrees on the 180 degree section of the position detection signal Shu, and generates an energization switching signal. The output signal is output to the signal generating section 352 of the section 35.

The energization synchronization adjustment unit 353 adjusts the change timing of the position detection signal Shu and the energization switching signal S6 based on the position detection signal Shu input from the position detector 25 and the PWM command value S3 input from the PWM command unit 331. It is determined whether or not the switching timing is synchronized, and a synchronization notification signal S7 containing synchronization information is generated. Since the PWM command value S3 includes information on the timing of the electrical angle of 60 degrees designated by the energization switching signal S6, the switching timing of the energization switching signal S6 can be determined based on the PWM command value S3.

Here, synchronization between the position detection signal Shu and the energization switching signal S6 will be explained.

FIG. 6 is a diagram illustrating the relationship between the position detection signal Shu and the energization switching signal S6.
FIG. 6 shows six patterns of the timing of the position detection signal Shu with respect to the timing of 60 electrical degrees of the energization switching signal S6. In FIG. 6, broken lines extending vertically indicate rising edges or falling edges of the energization switching signal S6.

In this embodiment, the winding current flowing through the U-phase coil Lu of the motor 20 is one sine during the 360-degree electrical angle in which the energization switching signal S6 indicating the timing of the 60-degree electrical angle is output six times. Form a waveform. That is, the time when the energization switching signal S6 is output six times corresponds to the time of one cycle of rotation of the motor 20. The energization synchronization adjustment unit 353 can identify six timings corresponding to (1) to (6) of the energization switching signal S6 shown in FIG. 6 by counting the PWM command value S3 of the sine wave drive. .

The top row of FIG. 6 shows the relationship between the position detection signal Shu (solid line) and the energization switching signal S6 when they are synchronized, and (a) to (e) show the relationship between the position detection signal Shu (solid line) and the energization switching signal S6 when they are not synchronized. The relationship between the position detection signal Shu (broken line) and the energization switching signal S6 is shown.

In the example shown in FIG. 6, the energization synchronization adjustment unit 353 detects the falling edge of the position detection signal Shu at the timing (1) of the energization switching signal S6, and detects the position at the timing (4) of the energization switching signal S6. It is determined that synchronization is achieved when a rising edge of the signal Shu is detected.

On the other hand, the energization synchronization adjustment unit 353 determines that synchronization is not achieved when the phase of the position detection signal Shu indicating the rotational position of the rotor is earlier or later than the energization switching signal S6. Such cases are shown in (a) to (e) in FIG. 6.

Case (a) is a case where the detection timing of the position detection signal Shu is delayed by one with respect to the energization switching signal S6. That is, the falling edge of the position detection signal Shu is detected at the timing (2) of the energization switching signal S6, and the rising edge of the position detection signal Shu is detected at the timing (5) of the energization switching signal S6.

Case (b) is a case where the detection timing of the position detection signal Shu is delayed by two times with respect to the energization switching signal S6. That is, the falling edge of the position detection signal Shu is detected at the timing (3) of the energization switching signal S6, and the rising edge of the position detection signal Shu is detected at the timing (6) of the energization switching signal S6.

Case (c) is a case where the detection timing of the position detection signal Shu is delayed by three times with respect to the energization switching signal S6. That is, the falling edge of the position detection signal Shu is detected at the timing (4) of the energization switching signal S6, and the rising edge of the position detection signal Shu is detected at the timing (1) of the energization switching signal S6.

Case (d) is a case where the detection timing of the position detection signal Shu is delayed by four times with respect to the energization switching signal S6. That is, the falling edge of the position detection signal Shu is detected at the timing (5) of the energization switching signal S6, and the rising edge of the position detection signal Shu is detected at the timing (2) of the energization switching signal S6.

Case (e) is a case where the detection timing of the position detection signal Shu is delayed by five times with respect to the energization switching signal S6. That is, the falling edge of the position detection signal Shu is detected at the timing (6) of the energization switching signal S6, and the rising edge of the position detection signal Shu is detected at the timing (3) of the energization switching signal S6.

The energization synchronization adjustment unit 353 determines whether the change timing of the position detection signal Shu and the switching timing of the energization switching signal S6 are synchronized based on the position detection signal Shu and the PWM command value S3. Since the PWM command value S3 includes information on the timing of the electrical angle of 60 degrees designated by the energization switching signal S6, the switching timing of the energization switching signal S6 can be known based on the PWM command value S3.

For example, if the energization synchronization adjustment unit 353 determines that the case corresponds to the case shown in the top row of FIG. A synchronization notification signal S7 is generated that includes synchronization presence/absence information indicating that the change timing of the signal Shu and the switching timing of the energization switching signal S6 are synchronized.

For example, if it is determined that cases (a) to (e) in FIG. 6 apply, the energization synchronization adjustment unit 353 determines that the position detection signal Shu and the energization switching signal S6 are not synchronized, and A synchronization notification signal S7 is generated that includes synchronization information indicating that Shu and the energization switching signal S6 are not synchronized.

FIG. 7 is a diagram illustrating an example of the process flow of energization control in the control circuit unit 3. As illustrated in FIG.
In FIG. 7, the control circuit unit 3 first instructs 120-degree energization at the time of startup (step S101). Specifically, the energization method instruction section 34 generates an energization method instruction signal S5 that instructs rectangular wave drive with 120-degree energization immediately after startup, and outputs it to the PWM instruction section 331 of the drive control signal generation section 33. The energization switching signal generation section 35 outputs the energization switching signal S6 indicating the predetermined timing of 60 electrical degrees to the PWM command section 331 of the drive control signal generation section 33.

The control circuit unit 3 determines whether the position detection signal Shu has been acquired (detected) (step S102). Specifically, the energization method instructing unit 34 determines whether or not the position detection signal Shu in an interval of 180 degrees has been acquired (detected), for example. If the control circuit unit 3 cannot determine that the position detection signal Shu has been acquired (step S102: NO), it waits until it can determine.

When the control circuit unit 3 determines that the position detection signal Shu has been acquired (step S102: YES), it instructs sine wave driving (step S103). Specifically, the energization method instruction section 34 generates an energization method instruction signal S5 that instructs sine wave driving, and outputs it to the PWM instruction section 331.

When the control circuit unit 3 determines that the position detection signal Shu has been acquired (step S102: YES), the control circuit unit 3 determines whether the change timing of the position detection signal Shu and the switching timing of the energization switching signal S6 are synchronized. Determination is made (step S104). Specifically, the energization synchronization adjustment unit 353 determines whether the change timing of the position detection signal Shu and the switching timing of the energization switching signal S6 are synchronized based on the position detection signal Shu and the PWM command value S3. judge.

If the control circuit unit 3 determines that the change timing of the position detection signal Shu is not synchronized with the switching timing of the energization switching signal S6 (step S104: NO), the control circuit unit 3 uses the 180 degree section of the position detection signal Shu as a reference. An instruction is given to determine an electrical angle of 60 degrees (step S105). Specifically, the energization synchronization adjustment unit 353 determines that the change timing of the position detection signal Shu and the switching timing of the energization switching signal S6 are not synchronized, and includes synchronization presence/absence information indicating that they are not synchronized. A synchronization notification signal S7 is output to the electrical angle instruction section 354. Upon receiving this synchronization notification signal S7, the electrical angle instruction unit 354 sends an electrical angle generation reference instruction signal S8 to the signal generation unit 352, which instructs to generate an electrical angle of 60 degrees based on the 180 degree section of the position detection signal Shu. Output to.

On the other hand, when the control circuit unit 3 determines that the change timing of the position detection signal Shu is synchronized with the switching timing of the energization switching signal S6 (step S104: YES), the control circuit unit 3 An instruction is given to determine an electrical angle of 60 degrees based on (step S106). Specifically, the energization synchronization adjustment unit 353 determines that the change timing of the position detection signal Shu and the switching timing of the energization switching signal S6 are synchronized, and includes synchronization presence/absence information indicating that they are synchronized. A synchronization notification signal S7 is output to the electrical angle instruction section 354. Upon receiving this synchronization notification signal S7, the electrical angle instruction unit 354 sends an electrical angle generation reference instruction signal S8 to the signal generation unit 352, which instructs to generate an electrical angle of 60 degrees based on the 360 degree section of the position detection signal Shu. Output to.

The signal generation unit 352 generates an electrical angle of 60 degrees based on the section in the position detection signal Shu instructed by the processing in steps S105 and S106, and outputs it to the PWM command unit 331 as an energization switching signal S6.

The control circuit unit 3 determines whether or not to stop driving the motor 20 (step S107), and if the driving of the motor 20 is to be stopped (step S107: YES), it ends the process and stops driving the motor 20. If not stopped (step S107: YES), return to step S104 (step S107: NO) and continue the process.

As described above, in the motor drive control device 10 according to the present embodiment, the control circuit section 3 is determined based on either the 180 degree section or the 360 degree section of the position detection signal Shu, depending on the rotational state of the motor 20. At this timing, an energization switching signal S6 for switching the energization pattern to the three-phase coils Lu, Lv, and Lw of the motor 20 is generated, and the energization pattern is switched based on the energization switching signal S6, and the motor 20 is set to a sine wave. A drive control signal Sd for driving is generated.

According to this, in sine wave driving, if the rotation of the motor 20 is not in a stable state, the three-phase coils Lu, Lv of the motor 20, Since the energization switching signal S6 for switching the energization pattern to Lw is generated, the immediately preceding rotational speed of the motor 20 (change in the position detection signal Shu) can be reflected in the energization, and the followability for approaching the target driving state is improved. As a result, the startup time can be shortened. On the other hand, when the rotation of the motor 20 is stable, the three-phase coils Lu, Since the energization switching signal S6 for switching the energization pattern to Lv and Lw is generated, even if the duty ratio of the position detection signal Shu varies, it is possible to calculate the electrical angle of 60 degrees by averaging it, so the timing to switch the energization pattern is It is stable and, as a result, vibrations are suppressed.

In the motor drive control device 10 according to the present embodiment, the energization switching signal generation unit 35 determines whether the change timing of the position detection signal Shu and the switching timing of the energization switching signal S6 are synchronized. , the rotational state of the motor 20 is determined.

According to this, the rotational state of the motor 20 can be determined based on the position detection signal Shu and the PWM command value S3, so the configuration for determining the rotational state of the motor 20 can be simplified.

In the motor drive control device 10 according to the present embodiment, the control circuit section 3 transmits a PWM signal (control signal Example) After generating S4 as the drive control signal Sd and detecting the position detection signal Shu when starting the motor 20, drive control of the PWM signal (an example of a control signal) S4 for driving the motor 20 in a sine wave is performed. It is generated as a signal Sd.

According to this, the drive control signal Sd for driving the motor 20 in a sine wave can be generated when sine wave driving is possible. In the sine wave drive, a drive signal (PWM signal) with a predetermined duty ratio for each PWM cycle is generated every 360 electrical degrees, and each switching element of the inverter circuit 2a is switched, so that the winding current of the motor 20 has a sine waveform. Control so that The generation timing of the PWM signal for every 360 degrees of electrical angle is determined from the change time of the previous position detection signal Shu, so at startup, the motor 20 is driven by rectangular wave drive, and the change time of the position detection signal Shu is determined by the change time of the position detection signal Shu. Switch to sine wave drive at the timing when it is possible to detect.

≪Expansion of the embodiment≫
Although the invention made by the present inventor has been specifically explained based on the embodiments above, it goes without saying that the present invention is not limited thereto and can be modified in various ways without departing from the gist thereof. .

For example, in the above embodiment, it was determined whether the change timing of the position detection signal Shu and the switching timing of the energization switching signal S6 are synchronized by the method described using FIG. 6, but the method is not limited to this. First, a known method for determining the presence or absence of synchronization can be used.

In addition, when it is determined that the energization synchronization adjustment unit 353 is out of synchronization, the energization synchronization adjustment unit 353 transmits, for example, information indicating which of cases (a) to case (e) shown in FIG. It may be included in S7. In this case, for example, the electrical angle generation standard instruction signal S8 generated by the electrical angle instruction section 354 or the signal generation section 352 generates information indicating which of cases (a) to (e) shown in FIG. It may be included in the energization switching signal S6. The drive control signal generation unit 33 can adjust the phase of the PWM signal S4 generated as the drive control signal Sd according to information indicating the degree of asynchrony included in the energization switching signal S6.

Furthermore, in the embodiments described above, the motor 20 is not limited to a brushless DC motor. Further, the motor 20 is not limited to three phases, but may have a configuration of two or more phases.

In the embodiment described above, after starting the sine wave drive, the electrical angle of 60 degrees is calculated based on the 180 degree section, and after synchronization is achieved, the electrical angle of 60 degrees is calculated using the 360 degree section as the reference. However, these switchings are not limited to the time of startup. For example, if synchronization is lost again due to sudden deceleration after synchronization has been achieved, the calculation will change from calculating an electrical angle of 60 degrees based on a 360 degree section to calculating an electrical angle of 60 degrees based on a 180 degree section. , and after synchronization is achieved again, the electrical angle of 60 degrees may be calculated based on the 360 degree section.

In the above embodiment, the case where a Hall IC is used as the position detector 25 is illustrated, but the present invention is not limited to this. For example, a Hall element, an encoder, a resolver, etc. may be provided as the position detector 25, and their detection signals may be input to the motor drive control device 10 as the position detection signal Shu. Further, the number of position detectors 25 is not particularly limited. Furthermore, the motor drive control device 10 may calculate the rotational speed and electrical angle of the motor 20 by calculation using a known position sensorless method such as synchronous detection using winding voltage without providing the position detector 25. good.

In the above embodiment, the case of 120-degree energization has been described as an example of rectangular wave driving, but other energization angles such as 150-degree energization may be used.

Further, although the case where each functional unit of the control circuit unit 3 is realized by program processing of the MCU is illustrated, the present invention is not limited to this. ) may be realized.

Moreover, the above-mentioned flowchart is an example, and is not limited to these. For example, other processing may be inserted between each step, or processing may be parallelized.

DESCRIPTION OF SYMBOLS 1... Motor unit, 2... Motor drive part, 2a... Inverter circuit, 2b... Predrive circuit, 3... Control circuit part, 31... Rotation speed calculation part, 32... Speed command analysis part, 33... Drive control signal generation part, 331... PWM command section, 332... PWM signal generation section, 34... Energization method instruction section, 35... Energization switching signal generation section, 351... Timer, 352... Signal generation section, 353... Energization synchronization adjustment section (an example of a synchronization determination section) ), 354... Electrical angle indicator, 10... Motor drive control device, 20... Motor, 25... Position detector (an example of a position detection signal output part), Shu... Position detection signal, Sc... Drive command signal, Sd... Drive Control signal, S1... Target rotation speed signal, S2... Actual rotation speed signal, S3... PWM command value, S4... PWM signal (an example of a control signal), S5... Energization method instruction signal, S6... Energization switching signal, S7... Synchronization Notification signal, S8...Electrical angle generation reference instruction signal, Lu...U phase coil, Lv...V phase coil, Lw...W phase coil, Vuh, Vul, Vvh, Vvl, Vwh, Vwl... Drive signal, VU, WU, WV, UV, UW, VW...Electricity pattern.

Claims (6)

a motor drive unit that selectively energizes multiple phase coils of the motor;
a control circuit unit that outputs a drive control signal to the motor drive unit to switch energization patterns of the plurality of phase coils energized by the motor drive unit in a predetermined order;
a position detection signal output unit that outputs a position detection signal corresponding to the position of the rotor of the motor;
The control circuit section includes:
energization for switching the energization pattern to the plurality of phase coils of the motor at a timing determined based on either a 180 degree interval or a 360 degree interval in the position detection signal according to the rotational state of the motor; an energization switching signal generation unit that generates a switching signal;
a drive control signal generation unit that switches the energization pattern based on the energization switching signal and generates a control signal for driving the motor in a sine wave as the drive control signal;
Motor drive control device. The motor drive control device according to claim 1,
The energization switching signal generation section includes:
a synchronization determination unit that determines whether the change timing of the position detection signal and the switching timing of the energization switching signal are synchronized;
If the synchronization determination unit determines that the change timing of the position detection signal and the switching timing of the energization switching signal are not synchronized, the energization switching signal is output at a timing determined based on the 180 degree interval. is generated, and when the synchronization determination unit determines that the change timing of the position detection signal and the switching timing of the energization switching signal are synchronized, a timing determined based on the 360 degree interval is generated. a signal generation unit that generates the energization switching signal;
Motor drive control device. The motor drive control device according to claim 2,
The control circuit section includes:
Before detecting the position detection signal when starting the motor, instructing the drive control signal generation unit to generate a control signal for driving the motor in a rectangular wave as the drive control signal, After detecting the position detection signal when starting the motor, energization is performed to instruct the drive control signal generation unit to generate a control signal for driving the motor in a sine wave as the drive control signal. further comprising a method instruction section;
Motor drive control device. The motor drive control device according to claim 3,
When the drive control signal generation unit receives an instruction to generate a control signal for driving the motor in a rectangular wave from the energization method instruction unit, the drive control signal generation unit generates a control signal for 120-degree energization as the drive control signal. generate,
Motor drive control device. A motor drive control device according to any one of claims 1 to 4,
A motor unit comprising the motor. A motor drive unit selectively energizes the coils of multiple phases of the motor, and a drive control signal is output to the motor drive unit to set the energization pattern of the multiple phase coils energized by the motor drive unit to a predetermined pattern. A motor drive control method using a motor drive control device comprising a control circuit unit that switches in sequence, and a position detector that outputs a position detection signal corresponding to the position of a rotor of the motor, the method comprising:
The control circuit section energizes the coils of multiple phases of the motor at a timing determined based on either a 180 degree section or a 360 degree section of the position detection signal, depending on the rotational state of the motor. A first step of generating an energization switching signal for switching the pattern;
a second step of switching the energization pattern based on the energization switching signal and generating a control signal for driving the motor in a sine wave as the drive control signal;
Motor drive control method.

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