JP2008187776A - Motor drive controller - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor drive controller which can start a motor surely, even under the condition where the motor is rotating as normal rotation or reverse rotation, receiving the influence of wind, and the like, when starting the motor. <P>SOLUTION: The motor drive controller 1 controls the drive of the motor 51, by outputting the drive voltages SU1, SV1 and SW1 for driving the motor 51, which can rotate in the direction of normal rotation or in reverse direction. This motor drive controller 1 is equipped with a rotational direction detector 2 and a drive voltage regulator 5. The rotational direction detector 2 detects the rotational direction, immediately prior to the start of the motor 51. The drive voltage regulator 5 so regulates the drive voltages SU1, SV1, and SW1 at the start of the motor 51 as to differ from the specified voltage outputted from the motor 51, when the motor 51 starts in a state of non-rotation, according to the direction of rotation, immediately prior to the motor 51 detected by the rotational direction detector 2. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a motor drive control device, and more particularly, to a motor drive control device that controls drive of a motor by outputting a drive voltage for driving a motor that can rotate in a forward rotation direction or a reverse rotation direction.

  In recent years, in an air conditioner provided with devices such as a compressor and a fan, a motor is often used as a power source of these devices. The air conditioner further includes a drive device that drives the motor.

  Here, the case where a motor is used, for example as a power source of an outdoor fan is demonstrated. When the driving device tries to start the motor, if an external force in the reverse rotation direction is applied to the outdoor fan due to the influence of a reverse wind or the like, the motor rotates in the reverse rotation direction. When the motor is started in this state, a larger current flows through the motor than when the motor starts normally when no external force is applied to the outdoor fan as in the case of no wind. In particular, this current increases as the rotational speed of the motor toward the reverse rotation side increases. As described above, when the current flowing through the motor increases, the amount of heat generated in the output circuit in the drive device driving the motor increases, and for example, the switching elements constituting the output circuit may be destroyed.

Therefore, in Patent Document 1, an upper limit value of the rotation speed at the time of reverse rotation of the motor is provided, and when the rotation speed when the motor rotates in the reverse rotation direction exceeds this upper limit value, the rotation of the motor is stopped. Is disclosed.
JP-A-8-303386

  However, in the method described in Patent Document 1, for example, when the back wind is strong before the motor is started, the number of rotations in the reverse rotation direction of the motor exceeds the upper limit value before the start, and the motor may not be started. is there. Also, for example, when two fans are arranged side by side in one air flow path in the air conditioner, if one fan is driven in the normal rotation direction, the other fan It may rotate in the reverse rotation direction due to the influence. This phenomenon is likely to occur particularly when the static pressure difference between the inside and outside of the air conditioner is high. However, even in such a case, when starting the other fan, if the other fan is strongly influenced by one fan and is rotating in the reverse direction, the motor for driving the other fan There is a possibility that the number of rotations exceeds the upper limit before starting. As a result, this motor cannot be started.

  On the other hand, for example, when an external force is applied in the forward rotation direction of the fan due to the influence of the wind, etc., and the motor that is rotating in the forward rotation direction before starting is started, the DC voltage supplied to the output circuit in the drive device In some cases, a so-called boosting operation occurs. This is caused by the fact that the drive voltage output from the drive device to the motor is too small with respect to the rotation speed of the motor when the motor is started. As described above, when the boosting operation occurs, a so-called overvoltage protection function works inside the driving device, and as a result, the motor cannot be started normally.

  Therefore, according to the present invention, when starting the motor, the motor can be reliably started even when the motor is rotating in either the forward direction or the reverse direction due to the influence of the reverse wind or the forward wind. An object of the present invention is to provide a motor drive control device that can be used.

  The motor drive control device according to the first aspect of the invention outputs a drive voltage for driving a motor that can rotate in the forward rotation direction or the reverse rotation direction, and controls the drive of the motor. The motor drive control device includes a rotation direction detection unit and a drive voltage adjustment unit. The rotation direction detection means detects the rotation direction immediately before starting the motor. The drive voltage adjusting means outputs the drive voltage at the time of starting the motor to the motor when the motor starts in a non-rotating state according to the rotation direction of the motor detected by the rotation direction detecting means immediately before starting the motor. It is adjusted to be different from the predetermined drive voltage.

  This motor drive control device adjusts the duty, amplitude, etc. of the drive voltage at the start of the motor according to the rotation direction of the motor immediately before the start of the motor, and outputs it to the motor. As a result, just before starting the motor, even if the motor is already driven in the forward or reverse direction due to the influence of forward wind or reverse wind, the motor drive control The apparatus can be reliably started without abnormally stopping the motor.

  A motor drive control device according to a second aspect of the present invention is the motor drive control device according to the first aspect of the present invention, further comprising a rotation speed measuring means. The rotational speed measuring means measures the rotational speed of the motor immediately before starting the motor. The drive voltage adjusting means further adjusts the drive voltage at the time of starting the motor according to the number of rotations of the motor immediately before starting the motor.

  Thus, even if the motor is already rotating immediately before starting, the motor drive control device adjusts the driving voltage output to the motor in order to start the motor according to the number of rotations at that time. The motor can be started more reliably.

  A motor drive control device according to a third aspect is the motor drive control device according to the first or second aspect, wherein the drive voltage adjusting means adjusts the drive voltage to be smaller than a predetermined drive voltage.

  This motor drive control device, for example, when the motor is rotating in the reverse rotation direction immediately before starting due to the influence of the back wind or the like, the duty or amplitude of the driving voltage output to the motor to start this motor, It is made smaller than a predetermined drive voltage. Thereby, the motor drive control device can suppress the amount of current supplied to the motor, for example, when the motor that is rotating in the reverse direction is started immediately before the start.

  A motor drive control device according to a fourth aspect of the present invention is the motor drive control device according to the third aspect, wherein when the rotation direction of the motor immediately before starting the motor is a reverse rotation direction, the drive voltage adjusting means The duty of the drive voltage is made smaller than the duty of the predetermined drive voltage in accordance with the rotational speed.

  As this motor drive control device, for example, a device that performs PWM (Pulse-Width Modulation) control of the motor can be cited. The motor drive control device reduces the duty of the drive voltage for starting the motor to be smaller than the duty of the predetermined drive voltage when the motor is rotating in the reverse rotation direction immediately before the start due to the influence of, for example, the reverse wind . As a result, when the motor that is rotating in the reverse direction just before starting is started, the amount of current supplied to the motor is further suppressed.

  A motor drive control device according to a fifth aspect of the present invention is the motor drive control device according to the third or fourth aspect of the present invention, wherein when the rotation direction of the motor immediately before starting the motor is a reverse rotation direction, the drive voltage adjusting means The amplitude of the drive voltage is made smaller than the amplitude of the predetermined drive voltage according to the number of rotations of the motor.

  As this motor drive control device, for example, a device that controls a motor by PAM (Pulse-Amplitude Modulation) can be cited. The motor drive control device reduces the amplitude of the drive voltage for starting the motor to be smaller than the amplitude of the predetermined drive voltage when the motor rotates in the reverse rotation direction immediately before the start due to the influence of, for example, the back wind . As a result, when the motor that is rotating in the reverse direction just before starting is started, the amount of current supplied to the motor is further suppressed.

  A motor drive control device according to a sixth aspect of the present invention is the motor drive control device according to the first or second aspect of the present invention, wherein the drive voltage adjusting means adjusts the drive voltage to be larger than the predetermined drive voltage.

  For example, when the motor is rotating forward just before starting due to the influence of, for example, smooth wind, the motor drive control device sets the duty or amplitude of the driving voltage output to the motor to start the motor. Make it bigger. As a result, it is possible to prevent, for example, a phenomenon in which the DC voltage supplied to the drive voltage adjusting means of the motor drive control device is boosted when the motor that is rotating forward is started immediately before startup.

  A motor drive control device according to a seventh aspect of the present invention is the motor drive control device according to the sixth aspect of the present invention, wherein when the rotation direction of the motor immediately before starting the motor is a normal rotation direction, the drive voltage adjusting means Depending on the number of rotations, the duty of the drive voltage is made larger than the duty of the predetermined drive voltage.

  In the motor drive control device, for example, when the motor is rotating in the positive rotation direction immediately before starting due to the influence of wind, etc., the duty of the driving voltage for starting the motor is larger than the duty of the predetermined driving voltage. To do. As a result, when a motor that is rotating forward is started immediately before startup, for example, a phenomenon in which the DC voltage supplied to the drive voltage adjusting means of the motor drive control device is boosted can be further prevented.

  A motor drive control device according to an eighth aspect of the present invention is the motor drive control device according to the sixth or seventh aspect, wherein when the rotation direction of the motor immediately before starting the motor is a normal rotation direction, the drive voltage adjusting means The amplitude of the drive voltage is made larger than the amplitude of the predetermined drive voltage according to the number of rotations of the motor.

  For example, when the motor rotates in the forward rotation direction immediately before starting due to the influence of, for example, smooth wind, the motor drive control device increases the amplitude of the driving voltage for starting the motor larger than the amplitude of the predetermined driving voltage. To do. As a result, when a motor that is rotating forward is started immediately before startup, for example, a phenomenon in which the DC voltage supplied to the drive voltage adjusting means is boosted can be further prevented.

  The motor drive control device according to a ninth aspect of the present invention is the motor drive control device according to the sixth aspect of the present invention, wherein when the rotation direction of the motor immediately before starting the motor is a reverse rotation direction, the drive voltage adjusting means Depending on the number of rotations, the duty of the drive voltage is made larger than the duty of the predetermined drive voltage.

  Not only when starting a motor that is rotating forward just before starting, but also when the motor drive control device starts a motor that is rotating in reverse due to the influence of reverse wind, etc. There is a case where a boosting operation occurs in the DC voltage supplied to the voltage adjusting means. Therefore, in such a case, the motor drive control device makes the duty of the drive voltage output to the motor larger than the predetermined drive voltage when starting the motor rotating in the reverse rotation direction immediately before starting. As a result, when the motor is started from a state where the motor is reversely rotated immediately before starting, it is possible to prevent the step-up operation of the DC voltage from the power source.

  A motor drive control device according to a tenth aspect of the present invention is the motor drive control device according to the sixth or ninth aspect, wherein when the rotation direction of the motor immediately before starting the motor is a reverse rotation direction, the drive voltage adjusting means The amplitude of the drive voltage is made larger than the amplitude of the predetermined drive voltage according to the number of rotations of the motor.

  As a result, when the motor is started from a state where the motor is reversely rotated immediately before starting, it is possible to further prevent the DC voltage boosting operation from occurring.

  A motor drive control device according to an eleventh aspect of the present invention is the motor drive control device according to any of the third to tenth aspects of the present invention, further comprising a first measuring unit. The first measuring means measures the time after the motor is started. And when the time measured by the 1st measurement means passes the 1st predetermined time, a drive voltage adjustment means changes a drive voltage into a drive voltage at the time of normal rotation of a motor.

  According to this motor drive control device, after the first predetermined time has elapsed, the drive voltage during normal rotation is output to the motor. Therefore, the motor can reliably perform normal rotation.

  A motor drive control device according to a twelfth aspect of the present invention is the motor drive control device according to any of the third to tenth aspects of the present invention, wherein the number of rotations toward the positive rotation side of the motor becomes equal to or greater than a first predetermined number after the motor is started. In this case, the drive voltage adjusting means changes the drive voltage to a drive voltage during normal rotation of the motor.

  According to this motor drive control device, when the number of rotations of the motor toward the positive rotation side becomes equal to or greater than the first predetermined number, the drive voltage during normal rotation is output to the motor. Therefore, the motor can reliably perform normal rotation.

  A motor drive control device according to a thirteenth aspect of the present invention is the motor drive control device according to any of the fourth, fifth, ninth, and tenth aspects, wherein the number of rotations of the motor to the reverse rotation side is less than a second predetermined number after the motor is started In such a case, the drive voltage adjusting means changes the drive voltage to the drive voltage during normal rotation of the motor.

  According to this motor drive control device, when the motor is started in a state where the motor is rotating in the reverse rotation direction immediately before the start, when the rotation speed to the reverse rotation side of the motor becomes the second predetermined number or less, the motor The drive voltage during normal rotation is output to. Therefore, the motor can reliably perform normal rotation.

  A motor drive control device pertaining to a fourteenth aspect of the present invention is the motor drive control device pertaining to any of the third to fifth aspects of the present invention, wherein the drive voltage adjusting means controls the rotational speed of the motor in accordance with the rotational speed immediately before the start of the motor. The control parameter is adjusted to be smaller than a first predetermined control parameter used when the motor is started in a non-rotating state, and the drive voltage at the time of starting the motor is further adjusted based on the adjusted control parameter .

  Examples of means for controlling the rotational speed of the motor include P control, PI control, and PID control. This motor drive control device is used when, for example, the control parameter such as the PI control parameter is started when the motor is not rotated when the motor rotates in the reverse rotation direction immediately before the start due to the influence of the back wind, for example. To be smaller than the first predetermined control parameter. As a result, a drive voltage having a smaller duty or amplitude than the predetermined drive voltage output to the motor when the non-rotating motor is started is output to the motor. As described above, the present invention can be applied to a motor drive control device that performs rotational speed control such as PI control. For example, when starting a motor that rotates in the reverse direction, the current amount supplied to the motor is suppressed. be able to.

  A motor drive control device pertaining to a fifteenth aspect of the present invention is the motor drive control device pertaining to any of the sixth to tenth aspects of the present invention, wherein the drive voltage adjusting means controls the rotational speed of the motor according to the rotational speed immediately before the motor is started. The control parameter is adjusted to be larger than a predetermined second control parameter used when the motor is started in a non-rotating state, and the drive voltage is further adjusted based on the adjusted control parameter.

  For example, when the motor is rotating in the normal rotation direction or the reverse rotation direction immediately before starting due to the influence of, for example, normal wind or reverse wind, the motor drive control device is configured to change a control parameter such as a PI control parameter when the motor is not rotating. Is adjusted so as to be larger than the second predetermined control parameter used when starting the. As a result, a drive voltage having a duty or amplitude larger than the predetermined drive voltage output to the motor when the non-rotating motor is started is output to the motor. As a result, it is possible to prevent a DC voltage boosting operation from occurring when a motor rotating in the forward direction or the reverse direction is started.

  A motor drive control device pertaining to a sixteenth aspect of the present invention is the motor drive control device pertaining to the fourteenth or fifteenth aspect of the present invention, wherein the drive voltage adjusting means is any one of P control, PI control and PID control for the rotational speed of the motor. Take control.

  Thereby, the motor drive control device can accurately control the motor.

  A motor drive control device pertaining to a seventeenth aspect of the present invention is the motor drive control device pertaining to any of the fourteenth to sixteenth aspects of the present invention, further comprising second measuring means. The second measuring means measures the time after the motor is started. And when the time measured by the 2nd measurement means passes 2nd predetermined time, a drive voltage adjustment means adjusts so that a control parameter may become a control parameter at the time of motor normal rotation.

  Accordingly, after the second predetermined time has elapsed, the drive voltage during normal rotation is output to the motor. Therefore, the motor can reliably perform normal rotation.

  A motor drive control device pertaining to an eighteenth aspect of the present invention is the motor drive control device pertaining to any of the fourteenth to sixteenth aspects of the present invention, wherein when the number of rotations of the motor to the positive rotation side is greater than or equal to a third predetermined number, the drive voltage adjustment The means adjusts the control parameter so that it becomes a control parameter during normal rotation of the motor.

  As a result, when the number of rotations of the motor toward the positive rotation side is equal to or greater than the third predetermined number, the drive voltage during normal rotation is output to the motor. Therefore, the motor can reliably perform normal rotation.

  A motor drive control device pertaining to a nineteenth aspect of the present invention is the motor drive control device pertaining to any of the fourteenth to sixteenth aspects of the invention, wherein the rotation direction of the motor immediately before the motor activation is the reverse rotation direction, and after the motor activation, When the rotation speed to the rotation side becomes the fourth predetermined number or less, the drive voltage adjusting means adjusts the control parameter so as to be a control parameter at the time of normal motor rotation.

  According to this motor drive control device, when the motor is started in a state where the motor is rotating in the reverse rotation direction immediately before the start, when the rotation speed to the reverse rotation side of the motor becomes the fourth predetermined number or less, the motor The drive voltage during normal rotation is output to. Therefore, the motor can reliably perform normal rotation.

  A motor drive control device pertaining to a twentieth aspect of the present invention is the motor drive control device pertaining to any of the fourteenth to sixteenth aspects of the present invention, wherein the drive voltage adjusting means has a control parameter of normal motor rotation according to the rotational speed and rotational direction of the motor. Adjust to get closer to the time control parameters.

  As a result, the duty, amplitude, etc. of the drive voltage approach the drive voltage output during normal rotation of the motor according to the rotation speed and rotation direction of the motor. Therefore, the motor gradually starts normal rotation.

  A motor drive control device according to a twenty-first aspect is the motor drive control device according to any one of the first to twentieth aspects, wherein the motor is a fan motor.

  As a result, for example, when the fan motor is restarted from the state where the rotation is continued due to the inertia of the fan connected to the fan motor after the fan motor is stopped, or when the fan motor is rotated forward or reverse due to the influence of the reverse wind or the normal wind Even when the fan motor rotating in the direction is activated, the motor drive control device can reliably control the rotation of the fan motor. Thereby, a fan motor can perform exact rotation.

  A motor drive control device according to a twenty-second aspect of the present invention is the motor drive control device according to the twenty-first aspect of the present invention, wherein the fan motor is an outdoor unit fan motor used in an outdoor unit of an air conditioner.

  For outdoor units, disturbances caused by headwinds and normal winds are large. Therefore, by using the motor drive control device of the present invention to rotationally drive the outdoor unit fan motor, the outdoor unit fan motor can be rotated more reliably even when the disturbance is large.

  A motor drive control device according to a twenty-third aspect of the present invention is the motor drive control device according to any of the first to twenty-second aspects, wherein the motor is a brushless DC motor.

  When starting a motor that is rotating under the influence of headwind or normal wind, there is a case where the DC voltage is boosted. However, the motor drive control device of the present invention is used to drive the brushless DC motor to rotate. By using this, the phenomenon that the DC voltage is boosted can be further prevented.

  According to the motor drive control device of the first aspect of the present invention, the motor is already rotating in either the forward direction or the reverse direction due to an external force such as wind immediately before starting the motor, and this motor is started. Even if it exists, the motor drive control apparatus can be started reliably without abnormally stopping the motor.

  According to the motor drive control device of the second aspect, the motor can be started more reliably.

  According to the motor drive control devices according to the third to fifth and fourteenth aspects, the amount of current supplied to the motor can be suppressed.

  According to the motor drive control apparatus according to the sixth to tenth aspects and the fifteenth aspect, for example, a phenomenon in which the DC voltage supplied to the drive voltage adjusting means of the motor drive control apparatus is boosted can be prevented.

  According to the motor drive control devices according to the inventions 11 to 13 and the inventions 17 to 19, the motor can reliably perform normal rotation.

  According to the motor drive control device pertaining to the sixteenth aspect of the present invention, the motor can be accurately controlled.

  According to the motor drive control device pertaining to the twentieth aspect of the invention, the higher the motor rotation speed, the closer the drive voltage duty, amplitude, etc., to the drive voltage output during normal motor rotation. Therefore, the motor gradually starts normal rotation.

  According to the motor drive control device pertaining to the twenty-first aspect of the invention, the motor drive control device can reliably control the rotation of the fan motor. Therefore, the fan motor can rotate accurately.

  According to the motor drive control device pertaining to the twenty-second aspect of the present invention, the fan motor for the outdoor unit can rotate more reliably even when the disturbance is large.

  According to the motor drive control device pertaining to the twenty-third aspect of the present invention, the phenomenon that the DC voltage is boosted can be further prevented.

<First Embodiment>
(1) Overall and Motor Configuration FIG. 1 is an overall configuration diagram of a motor drive control system 100 including a motor 51 and a motor drive control device 1 for controlling the drive of the motor 51. Here, generally, a DC motor, an AC motor, a stepping motor, a brushless DC motor, or the like can be cited as the type of motor. In this embodiment, the motor 51 is a brushless DC motor.

  The motor 51 is an outdoor unit fan motor used as a drive source of the propeller fan 61 in the outdoor unit of the air conditioner, and includes a stator 52, a rotor 53, and three Hall elements 54a, 54b, 54c. Yes.

  The stator 52 includes U-phase, V-phase, and W-phase drive coils Lu, Lv, and Lw that are star-connected. One end of each of the U-phase, V-phase and W-phase drive coils Lu, Lv and Lw is connected to the U-phase, V-phase and W-phase drive coil terminals TU, TV and TW, respectively. It is connected to the. These three-phase drive coils Lu, Lv, and Lw generate an induced voltage according to the rotational speed and the position of the rotor 53 as the rotor 53 rotates.

  The rotor 53 includes a two-pole permanent magnet composed of an N pole and an S pole, and rotates about the rotation axis with respect to the stator 52. The rotation of the rotor 53 is output to the propeller fan 61 via an output shaft (not shown) that is on the same axis as the rotation shaft.

  The three Hall elements 54a to 54c detect the position of the rotor 53 with respect to the stator 52 based on the polarity of the permanent magnet of the rotor 53, and position detection signals Hu and Hv indicating the position of the rotor 53 after detection. , Hw is output to the motor drive control device 1.

(2) Configuration of Motor Drive Control Device Next, the configuration of the motor drive control device 1 according to the present embodiment will be described. As shown in FIG. 1, the motor drive control device 1 of the present embodiment includes a rotation direction detection unit 2, a rotation number measurement unit 3, a timer 4 (corresponding to a first measurement unit), a drive voltage adjustment unit 5, and a power supply unit 9. Is provided.

(Rotation direction detector)
The rotation direction detection unit 2 detects the rotation direction of the rotor 53 in the motor 51 using the position detection signals Hu, Hv, and Hw output from the hall elements 54a to 54c. Hereinafter, in order to simplify the description, the rotation direction of the rotor 53 in the motor 51 is simply referred to as “the rotation direction of the motor 51”.

  The detected rotation direction of the motor 51 is taken into the drive voltage adjusting unit 5.

[Rotation speed measurement unit]
The rotation speed measurement unit 3 measures the rotation speed of the rotor 53 in the motor 51 using the position detection signals Hu, Hv, Hw output from the hall elements 54a to 54c. Hereinafter, in order to simplify the description, the rotational speed of the rotor 53 in the motor 51 is simply referred to as “the rotational speed of the motor 51” as in the rotational direction of the motor 51.

  The measured number of rotations of the motor 51 is taken into the drive voltage adjustment unit 5.

[Timer]
The timer 4 measures the time after the motor 51 is started. The measured time is taken into the drive voltage adjustment unit 5 in the same manner as the rotation direction and rotation speed of the motor 51.

[Drive voltage adjustment section]
The drive voltage adjustment unit 5 generates drive voltages SU1, SV1, and SW1 for PWM (Pulse-Width Modulation) control of the motor 51 and outputs them to the motor 51. The drive voltage adjustment unit 5 includes a PWM control unit 6 and a gate. A control voltage generator 7 and an output circuit 8 are provided.

[PWM control unit]
The PWM controller 6 determines the duty of the drive voltages SU1, SV1, SW1 applied to the drive coils Lu, Lv, Lw based on the rotation direction and the rotation speed of the motor 51, and the PWM duty voltage indicating this duty v_duty is output to the gate control voltage generator 7. In particular, the PWM control unit 6 according to the present embodiment is affected by the propeller fan 61 under the influence of headwind and forward wind, and the motor in a state where the propeller fan 61 rotates by applying an external force in the forward direction or the reverse direction. When starting 51, the duty of drive voltage SU1, SV1, SW1 is determined based on the rotation direction and rotation speed of the motor 51 just before starting.

  Hereinafter, how the PWM control unit 6 according to the present embodiment determines the duty of the drive voltages SU1, SV1, and SW1 when starting the motor 51 will be described. Specifically, when starting the motor 51, the PWM control unit 6 first determines the current rotation direction and rotation number of the motor 51 from the rotation direction detection unit 2 and the rotation number measurement unit 3 immediately before starting the motor 51. Then, the duty of the drive voltages SU1, SV1, SW1 is determined by applying the acquired rotation direction and rotation speed to FIG. FIG. 2 shows the relationship between the number of rotations (rpm) of the motor 51 in each rotation direction immediately before starting the motor 51 and the duty (%) of the drive voltages SU1, SV1, SW1 output to the motor 51 when the motor 51 is started. Show. According to FIG. 2, when the rotation direction of the motor 51 immediately before the start of the motor 51 is the reverse rotation direction, the duty of the drive voltages SU1, SV1, SW1 output to the motor 51 when the motor 51 is started It is lower than the duty of the predetermined drive voltage output to the motor 51 when starting in the rotation state. In particular, the duty of the drive voltages SU1, SV1, and SW1 output to the motor 51 when the motor 51 is started becomes lower as the number of rotations in the reverse rotation direction of the motor 51 immediately before the motor 51 starts. Conversely, when the rotation direction of the motor 51 immediately before starting the motor 51 is the forward rotation direction, the duty of the drive voltages SU1, SV1, SW1 output to the motor 51 when starting the motor 51 is greater than the duty of the predetermined drive voltage. Is also expensive. In particular, the duty of the drive voltages SU1, SV1, and SW1 output to the motor 51 when the motor 51 is started increases as the number of rotations of the motor 51 in the positive rotation direction immediately before starting the motor 51 increases.

  Here, as a case where the motor 51 is started in a non-rotating state, the motor 51 is started in a so-called no-wind state in which the propeller fan 61 driven by the motor 51 is not affected by an external force such as a head wind or a normal wind. Is mentioned. Therefore, if the rotational speed immediately before starting the motor 51 is “0 rpm” when the motor 51 is started, the motor 51 is started from the non-rotating state, and the PWM control unit 6 starts the motor 51. The duty of the drive voltages SU1, SV1, SW1 is determined as the duty of the predetermined drive voltage. Note that the duty of the predetermined drive voltage can be determined in consideration of the sound and vibration of the motor 51. Needless to say, the duty of the drive voltages SU1, SV1, SW1 does not necessarily have to be a constant value, and may be, for example, sinusoidally modulated.

  According to FIG. 2, since an external force in the reverse rotation direction is applied to the propeller fan 61 due to the influence of the reverse wind or the like, when the motor 51 is rotating in the reverse rotation direction, the PWM controller 6 moves the motor 51 to the reverse rotation side. Is determined so that the duty of the drive voltages SU1, SV1, and SW1 when starting the motor 51 is smaller than the duty of the predetermined drive voltage. Conversely, when an external force in the forward rotation direction is applied to the propeller fan 61 due to the influence of forward wind or the like, when the motor 51 is rotating in the forward rotation direction, the PWM control unit 6 rotates the motor 51 to the forward rotation side. Depending on the number, the duty of the drive voltages SU1, SV1, SW1 when starting the motor 51 is determined to be larger than the duty of the predetermined drive voltage. In FIG. 2, the duty of the drive voltages SU1, SV1, and SW1 changes linearly according to the number of rotations. However, the duty is not limited to this, and may change stepwise in part or in the entire region.

Further, after starting the motor 51, the PWM control unit 6 sets the duty of the drive voltages SU1, SV1, SW1 to the normal values of the motor 51 when the rotation speed of the motor 51 and the measurement time of the timer 4 satisfy predetermined conditions. Change to duty of drive voltage during rotation. Here, examples of the predetermined condition include the following.
(I) When the measurement time by the timer 4 exceeds the first predetermined time.
(II) When the rotational speed of the motor 51 to the positive rotation side is equal to or greater than a predetermined rotational speed A (corresponding to a first predetermined number).
(III) When the motor 51 rotating in the reverse rotation direction is started and then the rotation of the motor 51 is switched to the forward rotation side (that is, when the rotation speed becomes “0 rpm”).
In the present embodiment, a case where predetermined conditions (I) and (II) are satisfied will be described below.

[Gate control voltage generator]
The gate control voltage generation unit 7 controls the output circuit 8 so that the drive voltages SU1, SV1, SW1 having the duty determined by the PWM control unit 6 are output from the output circuit 8 to the motor 51. More specifically, the gate control voltage generator 7 controls the on / off of the insulated gate bipolar transistors Q1 to Q6 based on the PWM duty voltage v_duty output from the PWM controller 6. Generate Gu, Gx, Gv, Gy, Gw, Gz. The generated gate control voltages Gu, Gx, Gv, Gy, Gw, Gz are applied to the gate terminals of the insulated gate bipolar transistors Q1 to Q6.

[Output circuit]
The output circuit 8 outputs drive voltages SU1, SV1, SW1 based on the gate control voltages Gu, Gx, Gv, Gy, Gw, Gz, and is an insulated gate bipolar transistor Q1 to Q6 (hereinafter simply referred to as a transistor). And the diodes D1 to D6 for reflux. The transistors Q1 and Q2, Q3 and Q4, Q5 and Q6 are connected in series between the power supply line and the GND line. The connection points NU, NV, NW between the transistors Q1 and Q2, Q3 and Q4, Q5 and Q6 are connected to the U-phase, V-phase and W-phase drive coil terminals TU, TV and TW of the motor 51, respectively. Yes. The diodes D1 to D6 have such characteristics that they are turned on when a reverse voltage is applied to the transistors Q1 to Q6, and are connected in parallel to the transistors Q1 to Q6.

  According to the output circuit 9 having such a configuration, the transistors Q1 to Q6 are turned on and off based on the gate control voltages Gu, Gx, Gv, Gy, Gw, and Gz applied to the respective gate terminals, so that the PWM control is performed. The drive voltages SU1, SV1, SW1 having the duty determined by the unit 6 are output to the drive coils Lu, Lv, Lw.

〔Power supply part〕
The power supply unit 9 converts an alternating voltage into a direct current, and generates a direct current voltage Vcc to be supplied to the output circuit 8 through a power supply wiring. The power supply unit 9 includes a function unit that changes the DC voltage Vcc according to the duty of the drive voltages SU, SV, and SW, the rotational speed of the motor 51, and the like. Examples of such a functional unit include a voltage adjustment circuit and a booster circuit.

(3) Operation of Motor Drive Control Device (3-1) Flow of a Series of Operations FIG. 3 is a flowchart for explaining a flow of a sequence of operations performed by the motor drive control device 1.

  Step S1-2: When the motor drive control device 1 obtains an activation instruction for the motor 51 from the outside of the motor drive control device 1, such as an outdoor unit of an air conditioner (S1), for example, the rotation direction detection unit 2 and the number of rotations. The measuring unit 3 detects and measures the rotation direction and the rotation speed of the motor 51 immediately before the motor 51 is started (S2).

  Steps S3 to 4: The PWM control unit 6 of the drive voltage adjusting unit 5 applies the rotation direction and the rotation speed of the motor 51 detected and measured in Step S2 to FIG. 2 and outputs them to the motor 51 to start the motor 51. The duty of the drive voltages SU1, SV1, SW1 to be determined is determined (S3). For example, when the rotation direction of the motor 51 detected in step S2 is reverse rotation, the PWM control unit 6 determines the duty of the drive voltages SU1, SV1, SW1 to be equal to or less than the duty of the predetermined drive voltage, and conversely When the rotation direction is forward rotation, the PWM control unit 6 determines the duty of the drive voltages SU1, SV1, SW1 to be equal to or greater than the duty of the predetermined drive voltage. The drive voltages SU1, SV1, SW1 having the duty determined in this way are output to the drive coils Lu, Lv, Lw in the motor 51 through the gate control voltage generator 7 and the output circuit 8 (S4). . As a result, the motor 51 is started. Then, the timer 4 starts measuring time.

  Steps S <b> 5 to 7: When the measurement time of the timer 4, the rotation speed of the motor 51, and the rotation direction satisfy predetermined conditions, the motor drive control device 1 performs rotation speed control for the motor 51. More specifically, the duty of the drive voltages SU1, SV1, SW1 is determined to be the duty of the drive voltage during normal rotation by the rotation speed control, and the drive voltages SU1, SV1 having the duty determined in this way , SW1 are output to the drive coils Lu, Lv, Lw in the motor 51 through the gate control voltage generator 7 and the output circuit 8 (S7). Here, the predetermined conditions include: (I) when the measurement time of the timer 4 has passed the first predetermined time (S5), (II) the rotational speed of the motor 51 to the forward rotation side becomes the predetermined rotational speed A. (S6) corresponds. In addition, when the measurement time of the timer 4, the rotation speed, and the rotation direction of the motor 51 do not satisfy any of the predetermined conditions in step S5 or S6, the motor drive control device 1 repeats the operations after step S5. In addition, examples of the rotational speed control method include P (Proportional) control, PI (Proportional and Integral) control, PID (Proportional, Integral and Derivative) control, and the like.

  Step S8: The motor drive control device 1 controls the rotation speed of the motor 51 until an instruction to stop the rotation of the motor 51 is obtained from the outside of the motor drive control device 1 such as an outdoor unit of the air conditioner (S8). In addition, when the motor drive control apparatus 1 acquires the rotation stop instruction | indication of the motor 51, it stops rotation of the motor 51 and complete | finishes a series of operation | movement.

(3-2) Example of Adjusted Drive Voltage Duty and Rotation Speed An example of the case where the motor drive control device 1 controls driving of the motor 51 in the above operation flow is shown in FIG. 4 and FIG. FIG. 4 shows the duty of the drive voltages SU1, SV1, SW1 that change over time, the rotational speed of the motor 51, and the drive coil in the motor 51 when the motor 51 rotating in the reverse direction is started before the start. It is the figure which showed the electric current which flows into Lu, Lv, and Lw. FIG. 5 shows the duty of the drive voltages SU1, SV1, SW1 that change over time, the rotational speed of the motor 51, and the power from the power supply unit 9 when the motor 51 rotating in the positive direction is started before the start. It is the figure which showed DC voltage.

  As shown in FIG. 4, when the motor 51 is rotating in the reverse direction before the start due to the influence of the head wind or the like, the motor drive control device 1 uses the drive voltages SU1, SV1 having a duty lower than the duty of the predetermined drive voltage. , SW1 is output to the motor 51, and the motor 51 is started. As a result, when the motor 51 starts from the reverse rotation state, the current that transiently flows in the drive coils Lu, Lv, and Lw of the motor 51 is suppressed. Eventually, the rotation direction of the motor 51 becomes positive rotation.

  Here, in FIG. 4, the measurement time by the timer 4 has passed the first predetermined time before the rotation speed on the forward rotation side of the motor 51 reaches the predetermined rotation speed A. Therefore, the motor drive control device 1 changes the duty of the drive voltages SU1, SV1, and SW1 to the duty at the time of normal rotation when the first predetermined time has elapsed, and then performs the rotation speed control. As a result, the motor drive control device 1 can set the rotation speed of the motor 51 to a desired rotation speed while suppressing the current that flows transiently through the drive coils Lu, Lv, and Lw of the motor 51.

  Further, as shown in FIG. 5, when the motor 51 is rotating in the positive direction before the start due to the influence of the wind and the like, the motor drive control device 1 drives the drive voltage SU1 having a duty higher than the duty of the predetermined drive voltage. , SV1 and SW1 are output to the motor 51 to drive the motor 51. As a result, the phenomenon in which the DC voltage Vcc supplied to the output circuit 8 is boosted because the duty of the drive voltage output to the motor 51 is lower than the duty of the drive voltage that should be output at this rotational speed is suppressed. Is done. Thereafter, the rotational speed of the motor 51 gradually increases.

  Here, in FIG. 5, the rotational speed on the forward rotation side of the motor 51 reaches the predetermined rotational speed A before the time measured by the timer 4 exceeds the first predetermined time. Therefore, when the rotational speed of the motor 51 reaches the predetermined rotational speed A, the motor drive control device 1 changes the duty of the drive voltages SU1, SV1, SW1 to the duty at the normal rotation, and then performs the rotational speed control. Yes. Thereby, the motor drive control device 1 can set the rotation speed of the motor 51 to a desired rotation speed without increasing the DC voltage Vcc.

(4) Effects In this motor drive control device 1, the motor 51 determines the duty and amplitude of the drive voltages SU1, SV1, SW1 for starting the motor 51 according to the rotation direction of the motor 51 immediately before the motor start. Adjust and output to the motor differently from when starting in the non-rotating state. As a result, an external force is applied to the motor 51 immediately before starting, and even when the motor 51 is started in a state where the motor 51 is already rotating in either the forward direction or the reverse direction, The drive control device 1 can reliably start the motor 51 without abnormally stopping it.

  Further, the motor drive control device 1 further adjusts the drive voltages SU1, SV1, and SW1 according to the rotation direction of the motor 51 and the number of rotations of the motor 51 immediately before starting the motor. Thereby, the motor drive control apparatus 1 can start the motor 51 more reliably.

  In particular, when the motor drive control device 1 activates the motor 51 in the state of rotating in the reverse rotation direction under the influence of the reverse wind or the like by the PWM control, the motor 51 is activated in the non-rotation state. Drive voltages SU1, SV1, and SW1 having a duty smaller than the predetermined drive voltage are output. Thereby, the amount of current that flows transiently to the motor 51 when the motor 51 is started can be suppressed.

  And when the motor drive control apparatus 1 starts the motor 51 of the state which is rotating in the normal rotation direction under the influence of a smooth wind etc. by PWM control, when the motor 51 starts in a non-rotation state Drive voltages SU1, SV1, and SW1 having a duty greater than the predetermined drive voltage are output. Thereby, it is possible to prevent a phenomenon in which the DC voltage Vcc is boosted when the motor 51 is started.

  In addition, after the first predetermined time has elapsed since the motor 51 that is rotating in the reverse rotation direction or the forward rotation direction is started, the motor drive control device 1 drives the drive voltages SU1, SV1, SW1 having the duty during normal rotation. Is output to the motor 51. As a result, the motor 51 can reliably perform normal rotation.

  In addition, after the motor 51 is started, when the rotational speed of the motor 51 to the forward rotation side becomes equal to or higher than the predetermined rotational speed A, the motor drive control device 1 outputs a drive voltage having a duty during normal rotation to the motor 51. To do. As a result, the motor 51 can reliably perform normal rotation.

Second Embodiment
FIG. 6 is a configuration diagram of an entire motor drive control system 200 including a motor drive control device 101 according to the second embodiment and a motor 51 that is driven and controlled by the motor drive control device 101.

  Here, since the motor 51 according to the present embodiment has the same configuration as the motor 51 of the first embodiment, the same reference numerals as those in FIG. 1 are given. That is, the motor 51 is an outdoor unit fan motor used as a drive source of the propeller fan 61 in the outdoor unit of the air conditioner, as in the first embodiment, and includes a stator 52, a rotor 53, and three Hall elements. And a three-phase brushless DC motor provided with 54a to 54c.

(1) Configuration of Motor Drive Control Device The motor drive control device 101 includes a rotation direction detection unit 102, a rotation number measurement unit 103, a timer 104 (corresponding to a second measurement unit), a drive voltage adjustment unit 105, and a power supply unit 110. . Here, the drive voltage adjusting unit 105 according to the present embodiment controls the rotational speed of the motor 51, generates drive voltages SU2, SV2, and SW2 and outputs them to the drive coils Lu, Lv, and Lw in the motor 51. Here, examples of the method for controlling the rotational speed of the motor 51 include P control, PI control, PID control, and the like. In this embodiment, the drive voltage adjustment unit 105 performs PI control on the rotational speed of the motor 51. Take as an example. The drive voltage adjustment unit 105 includes a storage unit 106, a PI control unit 107, a gate control voltage generation unit 108, and an output circuit 109.

  In addition, about the rotation direction detection part 102, the rotation speed measurement part 103, the timer 104, the gate control voltage generation part 108, the output circuit 109, and the power supply part 110, it attached in FIG. 1 which attached | subjected and showed the same name in 1st Embodiment. Since it has the same configuration as the rotation direction detection unit 2, the rotation number measurement unit 3, the timer 4, the gate control voltage generation unit 7, the output circuit 8, and the power supply unit 9, detailed description thereof is omitted.

  Hereinafter, the storage unit 106 and the PI control unit 107, which are one feature of the present embodiment, will be described.

  The storage unit 106 stores a program executed by the PI control unit 107. The storage unit 106 can store various PI control parameters adjusted by the PI control unit 107. Here, as the PI control parameter, a proportional parameter used for amplifying the deviation between the current rotational speed and the command rotational speed, an integration parameter used for integrating the accumulated value of the rotational speed deviation, and the rotational speed A deviation limit value indicating the upper limit of the deviation of the number can be used. The command rotational speed is input from the outside of the motor drive control device 101 such as an outdoor unit of an air conditioner.

  The PI control unit 107 includes a microcomputer including a CPU, and adjusts various PI control parameters based on the rotation direction and the rotation speed of the motor 51. Then, the PI control unit 107 performs PI control on the rotational speed of the motor 51 based on the various adjusted PI control parameters. More specifically, the PI control unit 107 determines the duty of the drive voltages SU2, SV2, and SW2 based on the adjusted PI control parameter, and outputs the PWM duty voltage v_duty indicating this duty to the gate control voltage generation unit 108. Output.

  Here, the PI control parameter and the duty of the drive voltages SU2, SV2, and SW2 are correlated. Therefore, the smaller the PI control parameter, the smaller the duty of the drive voltages SU2, SV2, SW2. Conversely, as the PI control parameter increases, the duty of the drive voltages SU2, SV2, and SW2 increases.

[Adjustment of PI control parameters]
Hereinafter, how the PI control unit 107 according to the present embodiment adjusts the PI control parameter when starting the motor 51 will be described. When starting the motor 51, the PI control unit 107 first acquires the rotation direction and the rotation speed of the motor 51 immediately before starting the motor 51, that is, the rotation direction detection unit 2 and the rotation number measurement unit 3, respectively, and then acquires them. The rotation direction and the number of rotations are applied to FIG. 7 to determine the PI control parameter. FIG. 7 shows the relationship between the number of rotations (rpm) of the motor 51 in each rotational direction immediately before the motor 51 is activated and the PI control parameter used when the motor 51 is activated. According to FIG. 7, when the rotation direction of the motor 51 immediately before the motor 51 is started is the reverse rotation direction, the PI control parameter used when starting the motor 51 is a predetermined parameter used when starting the motor 51 without rotating. Lower than the PI control parameter K1 (corresponding to the first predetermined control parameter and the second predetermined control parameter). In particular, as the number of rotations of the motor 51 in the reverse rotation direction immediately before starting the motor 51 increases, the PI control parameter used when starting the motor 51 becomes lower. On the other hand, when the rotation direction of the motor 51 immediately before starting the motor 51 is the normal rotation direction, the PI control parameter used when starting the motor 51 is higher than the predetermined PI control parameter K1. In particular, the PI control parameter used when starting the motor 51 becomes higher as the number of rotations of the motor 51 in the positive rotation direction immediately before the start of the motor 51 increases.

  Here, when the motor 51 is started in a non-rotating state, as in the first embodiment, the propeller fan 61 driven by the motor 51 is in a so-called no-winding state in which it is not affected by external forces such as headwind and forward wind. The case where the motor 51 starts is mentioned. Accordingly, if the rotational speed immediately before starting the motor 51 is “0 rpm” when the motor 51 is started, the motor 51 is started from the non-rotating state, and the PI control unit 107 is started when the motor 51 is started. The PI control parameter to be used is determined as a predetermined PI control parameter K1. The predetermined PI control parameter K1 can be determined in consideration of the sound, vibration, etc. of the motor 51.

  According to FIG. 7, since an external force in the reverse rotation direction is applied to the propeller fan 61 due to the influence of the reverse wind or the like, when the motor 51 is rotating in the reverse rotation direction, the PI control unit 107 moves toward the reverse rotation side of the motor 51. The PI control parameter when starting the motor 51 is determined to be smaller than a predetermined PI control parameter K1 according to the number of rotations. On the other hand, when the motor 51 is rotating in the forward rotation direction because an external force in the forward rotation direction is applied to the propeller fan 61 due to the influence of the wind or the like, the PI control unit 107 rotates the motor 51 toward the forward rotation side. According to the number, the PI control parameter when starting the motor 51 is determined to be larger than the predetermined PI control parameter K1. Although the PI control parameter changes linearly according to the number of rotations in FIG. 7, the PI control parameter is not limited to this, and may change stepwise in part or in the entire region.

In addition, after the motor 51 is started, the PI control unit 107 sets PI control parameters as PI control parameters during normal rotation of the motor 51 when the rotation speed of the motor 51 and the measurement time of the timer 104 satisfy predetermined conditions. Change to parameter K2. Here, as the predetermined condition, as in the first embodiment, for example, the following may be mentioned.
(I) When the measurement time by the timer 104 exceeds the second predetermined time.
(II) When the rotational speed of the motor 51 to the positive rotation side is equal to or higher than a predetermined rotational speed B (corresponding to a third predetermined number).
(III) When the motor 51 rotating in the reverse rotation direction is started and then the rotation of the motor 51 is switched to the forward rotation side (that is, when the rotation speed becomes “0 rpm”).
In the present embodiment, as in the first embodiment, a case where predetermined conditions (I) and (II) are satisfied will be described below.

  Further, the predetermined PI control parameter K1 and the PI control parameter K2 during normal rotation may be the same value or different values.

(2) Operation of Motor Drive Control Device (2-1) Flow of a Series of Operations FIG. 8 is a flowchart for explaining a flow of a sequence of operations performed by the motor drive control device 101.

  Steps S101 to S102: When the motor drive control device 101 acquires the start instruction and the command rotational speed of the motor 51 from the outside of the motor drive control device 101 (S101), the rotational direction detection unit 102 and the rotational speed measurement unit 103 are immediately before startup. That is, the current rotation direction and rotation speed of the motor 51 are detected and measured, respectively (S102).

  Steps S103 to S104: The PI control unit 107 of the drive voltage adjustment unit 105 applies the rotation direction and the number of rotations of the motor 51 detected and measured in Step S102 to FIG. Is stored in the storage unit 106 (S103). Drive signals SU2, SV2, and SW2 based on the PI control parameters determined by the PI control unit 107 are output to the motor 51 through the gate control voltage generation unit 108 and the output circuit 109 (104). As a result, the motor 51 is started. Then, the timer 104 starts measuring time.

  Step S <b> 105: The PI control unit 107 performs PI control on the rotation speed of the motor 51. The detailed operation of PI control will be described later.

  Steps S106 to S109: When the measurement time of the timer 104, the rotation number of the motor 51, and the rotation direction satisfy predetermined conditions, the PI control unit 107 sets the PI control parameter to the PI control parameter K2 during normal rotation of the motor 51. Change (S108). Then, the PI control unit 107 performs PI control based on the PI control parameter K2 (S109). As a result, the drive voltages SU2, SV2, and SW2 having a duty during normal rotation are output to the drive coils Lu, Lv, and Lw in the motor 51 through the gate control voltage generation unit 108 and the output circuit 109. Here, the predetermined conditions include (I) when the measurement time of the timer 104 has passed the second predetermined time (S106), and (II) when the rotational speed to the forward rotation side is equal to or higher than the predetermined rotational speed B (S107) corresponds. When the measurement time of the timer 104 and the rotation speed and rotation direction of the motor 51 do not satisfy any of steps S106 and S107, the motor drive control device 101 performs the operations after step S105.

  Step S110: When the motor drive control device 101 obtains an instruction to stop the rotation of the motor 51, the motor drive control device 101 stops the rotation of the motor 51 and ends the series of operations.

[PI control operation]
FIG. 9 is a flowchart showing the flow of the PI control operation in steps S105 and S109 of the above operation. Note that the calculation results obtained in the process of the following operations are temporarily stored in the storage unit 106.

  Step S121: The PI control unit 107 subtracts the current rotational speed of the motor 51 from the command rotational speed acquired from the outside to obtain a rotational speed deviation.

  Steps S122 to 123: When the rotational speed deviation is greater than or equal to the deviation limit value (S122), the PI control unit 107 replaces the deviation with the deviation limit value (S123). When the rotational speed deviation is less than the deviation limit value, the deviation obtained in step S121 is used in the subsequent calculations.

  Step S124: The PI control unit 107 obtains a proportional term by multiplying the deviation obtained in Step S121 or Step 123 by a proportional parameter that is a PI control parameter.

  Step S125: The PI control unit 107 multiplies the deviation obtained in step S121 or step 123 by the integral parameter, which is a PI control parameter, and adds the previously obtained integral term to obtain the integral term.

  Step S126: The PI control unit 107 adds the integral term obtained in step S125 to the proportional term obtained in step S124, and determines the duty of the drive voltages SU2, SV2, SW2.

(2-2) Example of Adjusted PI Control Parameter and Number of Revolutions An example of the case where the motor drive control device 101 drives and controls the motor 51 in the above operation flow is shown in FIGS. 10 and 11. FIG. 10 shows PI control parameters that change over time, the number of rotations of the motor 51, and the drive coils Lu, Lv, and Lw in the motor 51 when the motor 51 rotating in the reverse direction is started before the start. It is the figure which showed the electric current which flows. FIG. 11 shows PI control parameters that change over time, the number of rotations of the motor 51, and the DC voltage Vcc from the power supply unit 110 when the motor 51 rotating in the positive direction is started before starting. FIG. In FIGS. 10 and 11, the case where the predetermined PI control parameter K1 and the PI control parameter K2 during normal rotation have different values is taken as an example.

  As shown in FIG. 10, when the motor 51 is rotating in the reverse direction before the start due to the influence of the head wind or the like, the motor drive control device 101 determines the PI control parameter to a value lower than the predetermined PI control parameter K1. Then, PI control is performed based on this PI control parameter. As a result, when the motor 51 is started, drive voltages SU2, SV2, and SW2 having a duty lower than a predetermined drive voltage for starting the non-rotating motor 51 are output to the motor 51. Therefore, when the motor 51 is started from the reverse rotation state, the current that transiently flows in the drive coils Lu, Lv, Lw of the motor 51 is suppressed. Eventually, the rotation direction of the motor 51 becomes positive rotation.

  Here, in FIG. 10, the rotational speed on the forward rotation side of the motor 51 reaches the predetermined rotational speed B before the time measured by the timer 104 passes the second predetermined time. Therefore, the motor drive control device 101 performs PI control by changing the PI control parameter to the PI control parameter K2 for normal rotation when the rotation speed on the positive rotation side of the motor 51 reaches the predetermined rotation speed B. As a result, drive voltages SU2, SV2, and SW2 having a duty during normal rotation are output to the motor 51. Therefore, the motor drive control device 101 can set the rotational speed of the motor 51 to a desired rotational speed while suppressing the current that flows transiently through the drive coils Lu, Lv, and Lw of the motor 51.

  In addition, as shown in FIG. 11, when the motor 51 is rotating in the positive direction before the start due to the influence of the wind or the like, the motor drive control device 101 sets the PI control parameter to a value higher than the predetermined PI control parameter K1. And PI control is performed based on this PI control parameter. Thus, when starting the motor 51, the drive voltages SU2, SV2, and SW2 having a duty higher than the predetermined drive voltage when starting the non-rotating motor 51 are output to the motor 51 and output to the motor 51. The phenomenon that the DC voltage Vcc supplied to the output circuit 109 is boosted because the duty of the drive voltage is lower than the duty of the drive voltage that should be output at this rotational speed is suppressed. Thereafter, the rotational speed of the motor 51 gradually increases.

  Here, in FIG. 11, the measurement time by the timer 104 has passed the second predetermined time before the rotation speed of the motor 51 on the forward rotation side reaches the predetermined rotation speed B. Accordingly, when the second predetermined time has elapsed, the motor drive control device 101 changes the PI control parameter to the PI control parameter K2 during normal rotation, and performs PI control. As a result, drive voltages SU2, SV2, and SW2 having a duty during normal rotation are output to the motor 51. Therefore, the motor drive control device 101 can set the rotational speed of the motor 51 to a desired rotational speed without increasing the DC voltage Vcc.

(3) Effect When the motor drive control device 101 activates the motor 51 that is rotating in the reverse direction due to the influence of the headwind or the like, it depends on the rotation direction and the rotation speed of the motor 51 immediately before the motor 51 is activated. Thus, the PI control parameter is adjusted to be smaller than a predetermined PI control parameter K1 used when starting the non-rotating motor 51. The motor drive control apparatus 101 performs PI control based on the adjusted PI control parameter. Accordingly, when starting the motor 51, the drive voltages SU2, SV2, SW2 having a duty smaller than the predetermined drive voltage based on the predetermined PI control parameter K1 are output to the motor 51. Therefore, when the motor 51 is started in the reverse rotation state, the amount of current that flows transiently in the motor 51 can be suppressed.

  In addition, when the motor drive control device 101 activates the motor 51 that is rotating in the forward direction under the influence of forward wind or the like, the PI according to the rotation direction and the rotation speed of the motor 51 immediately before the motor 51 is activated. The control parameter is adjusted to be larger than a predetermined PI control parameter K1 used when starting the non-rotating motor 51. The motor drive control apparatus 101 performs PI control based on the adjusted PI control parameter. Thus, when the motor 51 is started, drive voltages SU2, SV2, SW2 having a duty larger than a predetermined drive voltage based on the predetermined PI control parameter K1 are output to the motor 51. Therefore, when the motor 51 is started in the forward rotation state, the phenomenon that the DC voltage Vcc is boosted due to the small duty of the drive voltages SU2, SV2, and SW2 can be suppressed.

  Moreover, since the motor drive control apparatus 101 performs any one of P control, PI control, and PID control about the rotation speed of the motor 51, it can control the motor 51 exactly.

  Further, the motor drive control device 101 changes the PI control parameter to the PI control parameter K2 at the time of normal rotation after the second predetermined time has elapsed after the motor 51 is started, and performs the PI control based on this. As a result, drive voltages SU2, SV2, and SW2 having a duty during normal rotation are output to the motor 51. Therefore, the motor 51 can reliably perform normal rotation.

  Further, the motor drive control device 101 changes the PI control parameter to the PI control parameter K2 during normal rotation when the rotational speed of the motor 51 to the forward rotation side becomes equal to or greater than the predetermined rotational speed B. As a result, drive voltages SU2, SV2, and SW2 having a duty during normal rotation are output to the motor 51. Therefore, the motor 51 can reliably perform normal rotation.

<Other embodiments>
As mentioned above, although one Embodiment of this invention was described, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the summary of invention.

  (A) Although the case where the motor drive control device 1 performs PWM control has been described in the first embodiment, the present invention is not limited to this. The motor drive control device of the present invention may perform so-called PAM (Pulse-Amplitude Modulation) control for controlling the amplitude of the drive voltage.

  FIG. 12 is a configuration diagram of a motor drive control system 300 including a motor drive control device 201 that performs PAM control and a motor 51 that is driven and controlled by the motor drive control device 201. As shown in FIG. 12, the motor drive control device 201 includes a PAM control unit 206 instead of the PWM control unit. In addition, about the other structure of the motor drive control apparatus 201, it is the same as that of 1st Embodiment. That is, the motor drive control device 201 includes a rotation direction detection unit 202, a rotation number measurement unit 203, a timer 204, a drive control adjustment unit 205, and a power supply unit 209. In particular, the power supply unit 209 includes a booster circuit that boosts the DC power supply Vcc in accordance with the rotation speed of the motor 51, the amplitude of the drive signal, and the like. The drive control adjustment unit 205 includes a PAM control unit 206, a gate control voltage generation unit 207, and an output circuit 208. In particular, the PAM control unit 206 also generates a signal for the power supply unit 209 to adjust the DC voltage Vcc. The motor 51 has the same configuration as that of the first embodiment, and is given the same reference numerals as those in FIG.

  In this motor drive control device 201, when the motor 51 immediately before starting the motor 51 is rotating in the reverse rotation direction, the drive voltage adjusting unit 205 drives the drive voltages SU3, SV3, The amplitude of SW3 is adjusted so as to be smaller than a predetermined drive voltage when starting the non-rotating motor 51. As a result, as in the first embodiment, for example, even when the motor 51 rotating in the reverse direction under the influence of headwind is activated, it is possible to suppress a transient increase in the amount of current flowing through the motor 51. it can.

  When the motor 51 is rotating in the forward rotation direction immediately before the motor 51 is started, the drive voltage adjustment unit 205 determines that the amplitude of the drive voltages SU3, SV3, and SW3 is zero according to the rotation speed immediately before the motor 51 is started. Adjustment is made so as to be larger than a predetermined drive voltage when starting the motor 51 in the rotating state. As a result, as in the first embodiment, for example, even when the motor 51 rotating in the positive direction under the influence of smooth wind is activated, the DC voltage from the power supply unit 209 is prevented from being boosted. Can do.

  Furthermore, the motor drive control device according to the present invention may be configured to simultaneously perform PWM control and PAM control. That is, the motor drive control device may change both the duty and the amplitude of the drive voltage at the time of starting the motor according to the rotation speed and the rotation direction of the motor immediately before the start.

  (B) Also in the second embodiment, the case where the duty of the driving voltage is changed by the motor control drive device 101 performing PI control based on the PI control parameter has been described. Even when the rotational speed control such as control and PID control is performed, only the amplitude of the drive voltage may be changed, or both the duty and the amplitude may be changed, as in the other embodiments (a).

  (C) In the first embodiment, it has been described that the DC voltage boosting operation occurs when starting the motor 51 rotating in the forward direction immediately before starting. Even when the motor 51 is started, a DC voltage boosting operation may occur in some cases. Therefore, when such a phenomenon occurs, when the motor drive control device 1 activates the motor 51 rotating in the reverse rotation direction immediately before activation, the drive voltage SU1 output to the motor 51 as shown in FIG. , SV1 and SW1 are set to have a duty greater than a predetermined drive voltage. As a result, when the motor 51 is started from the state where the motor 51 is reversely rotated immediately before the start-up, it is possible to prevent the step-up operation of the DC voltage from the power source.

  In the above, the motor drive control device 1 may make the amplitude of the drive voltages SU1, SV1, SW1 larger than the predetermined drive voltage instead of the duty. Accordingly, as described above, when the motor is started from a state where the motor 51 is reversely rotated immediately before starting, it is possible to prevent a DC voltage boosting operation from occurring.

  (D) Also, in the motor drive control device 101 according to the second embodiment, when the motor 51 that is rotating in reverse due to the influence of the reverse wind or the like is activated, a DC voltage boosting operation occurs. As shown in FIG. 14, the PI control parameter may be larger than a predetermined PI control parameter K1. As a result, as in the other embodiment (c), the duty and amplitude of the drive voltage output to the motor 51 when the motor 51 is started up are larger than the predetermined drive voltage, so that a boost operation of the DC voltage from the power supply occurs. Can be prevented.

(E) In the first embodiment, as shown in FIG. 3, when the measured time of the timer 4 has passed the first predetermined time (S5), or the rotational speed of the motor 51 to the forward rotation side is the predetermined rotational speed. The case where the duty of the drive voltages SU1, SV1, and SW1 is changed to the duty of the drive voltage during the normal rotation of the motor 51 when it becomes A (S6) has been described. However, the motor drive control device 1 may change the duty of the drive voltages SU1, SV1, and SW1 to the duty of the drive voltage during normal rotation of the motor 51 when the following condition (IV) is further satisfied.
(IV) When the motor 51 is started while rotating in the reverse direction, and the rotation speed of the motor 51 in the reverse rotation direction is equal to or less than a predetermined rotation speed C (corresponding to a second predetermined number).

  FIG. 15 shows the duty of the drive voltages SU1, SV1, SW1 that change with time, the rotation speed of the motor 51, and the current flowing in the motor 51 when this condition is satisfied. In FIG. 15, the motor drive control device 1 activates the motor 51 rotating in the reverse direction immediately before activation. Then, before the measurement time of the timer 4 has passed the first predetermined time or the rotation speed on the forward rotation side of the motor 51 reaches the predetermined rotation speed A, the rotation speed on the reverse rotation side of the motor 51 is The rotation speed is equal to or lower than the predetermined rotation speed C. At this time, the motor drive control device 1 controls the rotational speed of the motor 51. By this rotation speed control, drive voltages SU1, SV1, SW1 having a duty during normal rotation are output to the motor 51. Thus, even if the motor drive control device 1 outputs the drive voltages SU1, SV1, SW1 during normal rotation when the condition (IV) is satisfied, the motor 51 can reliably rotate normally.

  (F) In the motor drive control device 101 according to the second embodiment, after the motor 51 rotating in the reverse direction is started, the rotation number of the motor 51 in the reverse rotation direction is set to the predetermined rotation number. If it is equal to or less than D (corresponding to the fourth predetermined number), the PI control parameter can be changed to the PI control parameter K2 during normal rotation (FIG. 16). Thereby, like other embodiment (e), the motor drive control apparatus 101 can rotate the motor 51 reliably reliably normally.

  (G) In the second embodiment, the case where the PI control parameter is adjusted until the rotation speed and the rotation direction of the motor 51 satisfy the predetermined conditions (I) and (II) has been described. As shown in FIG. 17, the PI control parameters until the conditions (I) and (II) are satisfied are gradually increased in the rotational speed and rotational direction of the motor 51 so as to gradually approach the duty at the time of normal rotation. It may be changed accordingly.

  In FIG. 17, the motor before starting is rotating in the reverse direction, and the PI control parameter is first determined to be lower than the predetermined PI control parameter K1. Thereafter, the PI control parameter is adjusted so as to approach the PI control parameter K2 during normal rotation in accordance with the increase in the rotational speed to the forward rotation side of the motor. As a result, the duty and amplitude of the drive voltage output to the motor gradually approach the duty and amplitude during normal rotation. Therefore, when the motor starts from the reverse rotation state, the current that flows transiently to the motor drive coil can be suppressed.

  (H) In the first and second embodiments, the drive voltage and the PI control parameter for starting the motor are described as being adjusted according to the rotation direction and the number of rotations of the motor immediately before starting the motor. The drive voltage and the PI control parameter may be adjusted according to only the rotation direction of the motor immediately before starting the motor.

  (I) In the first and second embodiments, the case where the motor 51 is a brushless DC motor has been described as an example. However, the motor 51 may be another type of motor such as an induction motor. In particular, when the motor is a DC motor, the drive voltage can be a constant voltage.

  (J) In the first and second embodiments, the case where the insulated gate bipolar transistors Q1 to Q6 and Q11 to Q16 are used as the switching elements in the output circuits 8 and 109 has been described. Other types of elements may be used. In the first and second embodiments, Nch insulated gate bipolar transistors Q1 to Q6 and Q11 to Q16 are used. However, Pch transistors may be used.

  The motor drive control device according to the present invention can be applied as a device for controlling the drive of a motor used as a rotational drive source such as a compressor or a fan in an air conditioner.

The block diagram which showed the structure of the whole motor drive control system which concerns on 1st Embodiment, and the internal structure of the motor drive control apparatus. The conceptual diagram which shows the relationship between the rotation speed in each rotation direction immediately before the motor starting which concerns on 1st Embodiment, and the duty of the drive voltage output to a motor when starting a motor. The flowchart for demonstrating the flow of a series of operation | movement which the motor drive control apparatus which concerns on 1st Embodiment performs. The figure which showed an example of each signal which changes with time when the motor drive control apparatus which concerns on 1st Embodiment starts the motor rotating in the reverse direction. The figure which showed an example of each signal which changes with time, when the motor drive control apparatus which concerns on 1st Embodiment starts the motor rotating in the positive direction. The block diagram which showed the structure of the whole motor drive control system which concerns on 2nd Embodiment, and the internal structure of the motor drive control apparatus. The conceptual diagram which shows the relationship between the rotation speed in each rotation direction immediately before motor starting which concerns on 2nd Embodiment, and PI control parameter used when starting a motor. The flowchart for demonstrating the flow of a series of operation | movement which the motor drive control apparatus which concerns on 2nd Embodiment performs. The flowchart for demonstrating the flow of PI control operation | movement. The figure which showed an example of each signal which changes with time, when the motor drive control apparatus which concerns on 2nd Embodiment starts the motor rotating in the reverse direction. The figure which showed an example of each signal which changes with time, when the motor drive control apparatus which concerns on 2nd Embodiment starts the motor rotating in the positive direction. The block diagram which showed the structure of the whole motor drive control system which concerns on other embodiment (a), and the internal structure of a motor drive control apparatus. The figure corresponding to other embodiment (c), Comprising: The figure which showed an example of each signal which changes with time when the motor which rotates in the reverse direction is started. The figure corresponding to other embodiment (d), Comprising: The figure which showed an example of each signal which changes with time when the motor which rotates in the reverse direction is started. The figure corresponding to other embodiment (e), Comprising: The figure which showed an example of each signal which changes with time when the motor which rotates in the reverse direction is started. The figure corresponding to other embodiment (f), Comprising: The figure which showed an example of each signal which changes with time when the motor which rotates in the reverse direction is started. The figure corresponding to other embodiment (g), Comprising: The figure which showed an example of each signal which changes with time when the motor which rotates in the reverse direction is started.

Explanation of symbols

1, 101, 201 Motor drive control device 2, 102, 202 Rotation direction detection unit 3, 103, 203 Rotational speed measurement unit 4, 104, 204 Timer 5, 105, 205 Drive voltage adjustment unit 6 PWM control unit 7, 108, 207 Gate control voltage generation unit 8, 109, 208 Output circuit 9, 110, 209 Power supply unit 51 Motor 52 Stator 53 Rotors 54a to 54c Hall element 61 Propeller fan 100, 200, 300 Motor drive control system 106 Storage unit 107 PI control unit 206 PAM control unit
Lu, Lv, Lw drive coil
SU1, SV1, SW1 SU2, SV2, SW2 SU3, SV3, SW3 Drive voltage

Claims (23)

A motor that controls driving of the motor (51) by outputting driving voltages (SU1 to SW1, SU2 to SW2, SU3 to SW3) for driving the motor (51) that can be rotated in the forward rotation direction or the reverse rotation direction. A drive control device (1) comprising:
Rotation direction detection means (2, 102, 202) for detecting the rotation direction immediately before the motor (51) is activated;
The drive voltage (SU1 to SW1, SU2 to SW2 at the time of starting the motor (51) according to the rotation direction immediately before the starting of the motor (51) detected by the rotation direction detecting means (2, 102, 202). , SU3 to SW3) drive voltage adjusting means (5, 105, 205) for adjusting the motor (51) to be different from a predetermined drive voltage output to the motor (51) when the motor (51) is started in a non-rotating state. )When,
A motor drive control device (1, 101, 201). The motor (51) further comprises a rotational speed measuring means (3) for measuring the rotational speed of the motor immediately before starting.
The drive voltage adjusting means (5, 105, 205) is configured so that the drive voltage (SU1 to SW1, SU2 to SW2 at the start of the motor (51) depends on the rotation speed of the motor (51) immediately before the start of the motor (51). , SU3 to SW3) are further adjusted, the motor drive control device (1, 101, 201) according to claim 1.   The drive voltage adjusting means (5, 105, 205) adjusts the drive voltage (SU1 to SW1, SU2 to SW2, SU3 to SW3) to be smaller than the predetermined drive voltage. The motor drive control device described (1, 101, 201).   When the rotation direction of the motor (51) immediately before starting the motor (51) is the reverse rotation direction, the drive voltage adjusting means (5) rotates the number of rotations of the motor (51) immediately before starting the motor (51). The motor drive control device (1) according to claim 3, wherein a duty of the drive voltage (SU1, SV1, SW1) is made smaller than a duty of the predetermined drive voltage according to the above.   When the rotation direction of the motor (51) immediately before starting the motor (51) is the reverse rotation direction, the drive voltage adjusting means (205) is configured to rotate the motor (51) immediately before starting the motor (51). The motor drive control device (201) according to claim 3 or 4, wherein the amplitude of the drive voltage (SU3, SV3, SW3) is made smaller than the amplitude of the predetermined drive voltage.   The drive voltage adjusting means (5, 105, 205) adjusts the drive voltage (SU1 to SW1, SU2 to SW2, SU3 to SW3) to be larger than the predetermined drive voltage. The motor drive control device described (1, 101, 201).   When the rotation direction of the motor (51) immediately before starting the motor (51) is a normal rotation direction, the drive voltage adjusting means (5) rotates the rotation number of the motor (51) immediately before starting the motor (51). The motor drive control device (1) according to claim 6, wherein the duty of the drive voltage (SU1, SV1, SW1) is made larger than the duty of the predetermined drive voltage according to the above.   When the rotation direction of the motor (51) immediately before starting the motor (51) is a positive rotation direction, the drive voltage adjusting means (205) is configured to rotate the motor (51) immediately before starting the motor (51). The motor drive control device (201) according to claim 6 or 7, wherein the drive voltage (SU3, SV3, SW3) is made larger in amplitude than the predetermined drive voltage.   When the rotation direction of the motor (51) immediately before starting the motor (51) is the reverse rotation direction, the drive voltage adjusting means (5) rotates the number of rotations of the motor (51) immediately before starting the motor (51). The motor drive control device (1) according to claim 6, wherein the duty of the drive voltage (SU1, SV1, SW1) is made larger than the duty of the predetermined drive voltage according to the above.   When the rotation direction of the motor (51) immediately before starting the motor (51) is the reverse rotation direction, the drive voltage adjusting means (205) is configured to rotate the motor (51) immediately before starting the motor (51). The motor drive control device (201) according to claim 6 or 9, wherein the amplitude of the drive voltage (SU3, SV3, SW3) is made larger than the amplitude of the predetermined drive voltage according to the above. A first measuring means (4, 204) for measuring the time since the motor (51) is started;
When the time measured by the first measuring means (4, 204) has passed the first predetermined time, the driving voltage adjusting means (5, 205) is configured to output the driving voltages (SU1 to SW1, SU3 to SW3). The motor drive control device (1, 201) according to any one of claims 3 to 10, wherein the motor is changed to a drive voltage during normal rotation of the motor (51).   After the motor (51) is started, when the rotational speed of the motor (51) to the positive rotation side becomes a first predetermined number or more, the drive voltage adjusting means (5, 205) The motor drive control device (1, 201) according to any one of claims 3 to 10, wherein -SW1, SU3-SW3) are changed to drive voltages during normal rotation of the motor (51).   After the motor (51) is started, when the rotational speed of the motor (51) to the reverse rotation side becomes a second predetermined number or less, the drive voltage adjusting means (5, 205) The motor drive control device (1, 201) according to any one of claims 4, 5, 9, and 10, wherein SW1, SU3 to SW3) are changed to drive voltages during normal rotation of the motor (51).   The drive voltage adjusting means (105) sets a control parameter for controlling the rotational speed of the motor (51) according to the rotational speed of the motor (51) immediately before the motor (51) is started. 51) is adjusted to be smaller than a first predetermined control parameter used when starting in a non-rotating state, and the drive voltage (SU2, SU2, when starting the motor (51) is adjusted based on the adjusted control parameter. The motor drive control device (101) according to any one of claims 3 to 5, further adjusting SV2, SW2).   The drive voltage adjusting means (105) sets a control parameter for controlling the rotational speed of the motor (51) according to the rotational speed of the motor (51) immediately before the motor (51) is started. 51) is adjusted to be larger than a second predetermined control parameter used when starting in a non-rotating state, and the drive voltage (SU2, SU2, when starting the motor (51) is adjusted based on the adjusted control parameter. The motor drive control device (101) according to any one of claims 6 to 10, further adjusting SV2, SW2).   The motor drive control device according to claim 14 or 15, wherein the drive voltage adjusting means (105) controls any one of P control, PI control, and PID control with respect to the rotation speed of the motor (51). (101). A second measuring means (104) for measuring a time after the motor (51) is started;
When the time measured by the second measuring means (104) has passed the second predetermined time, the drive voltage adjusting means (105) is configured so that the control parameter becomes a control parameter during normal rotation of the motor. The motor drive control device (101) according to any one of claims 14 to 16, which is adjusted.   When the number of rotations of the motor (51) to the positive rotation side is equal to or greater than a third predetermined number, the drive voltage adjusting means (105) is configured so that the control parameter becomes a control parameter during normal rotation of the motor. The motor drive control device (101) according to any one of claims 14 to 16, which is adjusted.   The rotation direction of the motor (51) immediately before the start of the motor (51) is the reverse rotation direction, and after the start of the motor (51), the rotation speed of the motor (51) to the reverse rotation side is a fourth predetermined number. The motor according to any one of claims 14 to 16, wherein when the number is less than or equal to a number, the drive voltage adjusting means (5, 205) adjusts the control parameter so as to be a control parameter during normal rotation of the motor. Drive control device (1, 201).   In the drive voltage adjusting means (105), the control parameter approaches the control parameter during normal rotation of the motor (51) according to the rotation speed and rotation direction of the motor (51) after the motor (51) is started. The motor drive control device (101) according to claims 14 to 16, which is adjusted as follows.   The motor drive control device (1, 101, 201) according to any one of claims 1 to 20, wherein the motor (51) is a fan motor.   The motor drive control device (1, 101, 201) according to claim 21, wherein the fan motor is an outdoor unit fan motor used in an outdoor unit of an air conditioner.   The motor drive control device (1, 101, 201) according to any one of claims 1 to 22, wherein the motor (51) is a brushless DC motor.

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