WO2021111808A1 - Dispositif d'entraînement de moteur - Google Patents

Dispositif d'entraînement de moteur Download PDF

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Publication number
WO2021111808A1
WO2021111808A1 PCT/JP2020/041635 JP2020041635W WO2021111808A1 WO 2021111808 A1 WO2021111808 A1 WO 2021111808A1 JP 2020041635 W JP2020041635 W JP 2020041635W WO 2021111808 A1 WO2021111808 A1 WO 2021111808A1
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WO
WIPO (PCT)
Prior art keywords
motor
rotation speed
duty ratio
threshold value
unit
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PCT/JP2020/041635
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English (en)
Japanese (ja)
Inventor
浩二 水上
純也 金子
Original Assignee
日本電産サーボ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 日本電産サーボ株式会社 filed Critical 日本電産サーボ株式会社
Priority to JP2021562520A priority Critical patent/JPWO2021111808A1/ja
Priority to CN202080084443.7A priority patent/CN114762244A/zh
Publication of WO2021111808A1 publication Critical patent/WO2021111808A1/fr

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
    • H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
    • H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
    • H02P27/08—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation

Definitions

  • the present invention relates to a motor drive device.
  • the motor is tried to be driven stably by comparing the current flowing through the motor with the threshold value, but if the threshold value is not appropriate, the motor cannot be driven efficiently and the operation may be inefficient. was there.
  • An object of the present invention is to provide a motor drive device for efficiently driving a motor.
  • An exemplary first invention of the present application is a motor drive device for driving a motor, in which a rotation speed acquisition unit that acquires the rotation speed for rotating the motor and a rotation speed acquired by the rotation speed acquisition unit are used.
  • the duty ratio setting unit that sets the duty ratio of the PWM signal that drives the motor, the PWM signal output unit that outputs the PWM signal of the duty ratio set by the duty ratio setting unit, and the PWM signal output unit output.
  • a driver for driving the motor based on a PWM signal and a current detection unit for detecting the current flowing through the motor are provided, and the duty ratio setting unit has reached the first threshold value of the current detected by the current detection unit.
  • the first control that sets the duty ratio to an initial value at the time of starting driving of the motor or a predetermined value larger than the initial value, and when the current detected by the current detection unit reaches the second threshold value.
  • the second control for setting the duty ratio to the initial value is executed, and the duty ratio setting unit acquires at least one of the first threshold value and the second threshold value by the rotation speed acquisition unit. Change according to the number of rotations.
  • the motor can be driven efficiently.
  • FIG. 10 It is sectional drawing which shows the motor driven by the motor drive device which concerns on 1st Embodiment of this invention, cut at the plane orthogonal to Y axis and passing through the central axis J. It is a perspective view of the motor 10 of FIG. It is a top view which removed the motor housing 23 from the motor 10 of FIG. It is a block diagram which shows the structure of the motor drive device which concerns on embodiment of this invention. It is a flowchart which shows the motor drive processing by a motor drive device 100. It is a flowchart which shows the duty ratio setting process by a motor drive device 100. It is a flowchart which shows the 1st control shown in FIG. It is a flowchart which shows the 2nd control shown in FIG. It is a flowchart which shows the 3rd control shown in FIG.
  • the XYZ coordinate system is shown as a three-dimensional Cartesian coordinate system as appropriate.
  • the Z-axis direction is a direction parallel to the axial direction of the central axis J shown in FIG.
  • the X-axis direction is the radial direction with respect to the central axis J.
  • the Y-axis direction is a direction orthogonal to both the X-axis direction and the Z-axis direction.
  • the side pointed by the arrow in the figure is the + side
  • the opposite side is the-side.
  • the positive side (+ Z side) in the Z-axis direction is referred to as “front side” or “one side”
  • the negative side (-Z side) in the Z-axis direction is referred to as "rear side” or “rear side”.
  • the other side is names used only for explanation, and do not limit the actual positional relationship and direction.
  • the direction parallel to the central axis J (Z-axis direction) is simply referred to as the "axial direction”
  • the radial direction centered on the central axis J is simply referred to as the "radial direction”.
  • the circumferential direction around the center that is, around the central axis J is simply called the "circumferential direction”.
  • the side approaching the central axis J in the radial direction is referred to as “diameter inside”, and the side away from the central axis J is referred to as “diameter outside”.
  • extending in the axial direction means not only extending in the strict axial direction (Z-axis direction) but also extending in a direction inclined within a range of less than 45 ° with respect to the axial direction. Also includes. Further, in the present specification, "extending in the radial direction” means that it extends in the radial direction, that is, in the direction perpendicular to the axial direction (Z-axis direction), and 45 in the radial direction. Including the case where it extends in the tilted direction within the range of less than °. Further, "parallel” includes not only the case where they are strictly parallel but also the case where the angles formed by each other are tilted within a range of less than 45 °.
  • rotational speed simply means the number of revolutions per unit time. For example, when the number of revolutions is 1300, the number of revolutions per minute is 1300 revolutions, that is, 1300 [rpm. ].
  • FIG. 1 is a cross-sectional view showing a motor driven by the motor driving device according to the first embodiment of the present invention cut along a plane orthogonal to the Y axis and passing through the central axis J.
  • FIG. 2 is a perspective view of the motor 10 of FIG.
  • the motor 10 is a brushless DC motor.
  • the motor 10 includes a motor unit 30 including a rotor 50 having a motor shaft 41 arranged along a central axis J extending in the axial direction, a stator 40 facing the rotor 50 with a gap in the radial direction, and a motor.
  • It includes motor housings 21 and 23 that accommodate a circuit board 80 on which a drive circuit 81 or the like for driving the unit 30 is mounted.
  • the motor housings 21 and 23 are arranged and accommodated in the order of the circuit board 80 and the rotor 50 from one side in the axial direction to the other side in the axial direction.
  • the motor 10 includes a stator 40, and the stator 40 includes a stator yoke 42.
  • the motor 10 has a circuit board 80 on one side of the stator yoke 42 in the axial direction.
  • the circuit board 80 has a through hole 80a penetrating in the axial direction.
  • the motor shaft 41 penetrates the through hole 80a.
  • the motor 10 includes bearings 55a and 55b.
  • the bearing 55a is arranged on the other side of the motor housing 23 in the axial direction.
  • the bearing 55b is arranged on one side in the axial direction of the motor housing 21.
  • the bearing 55a is arranged at one end of the motor shaft 41 in the axial direction.
  • the bearing 55b is arranged at the other end in the axial direction of the motor shaft 41.
  • Bearings 55a and 55b rotatably support the motor shaft 41.
  • the shapes, structures, etc. of the bearings 55a and 55b are not particularly limited, and any known bearing can be used.
  • the rotor 50 includes a rotor magnet 51.
  • the rotor magnet 51 surrounds the motor shaft 41 around the shaft and is fixed to the motor shaft 41.
  • the motor 10 has a bottomed tubular motor housing 21.
  • the motor portion 30 is housed inside the motor housing 21 in the radial direction.
  • the motor housing 21 may have a cylindrical shape or a square cylinder shape.
  • the motor housing 21 is made of, for example, aluminum die-cast.
  • the motor 10 has a bottomed tubular motor housing 23 on one side in the axial direction of the circuit board 80.
  • the motor housing 23 may have a cylindrical shape or a square cylinder shape.
  • the motor housing 23 is made of, for example, aluminum die-cast.
  • the motor housing 21 opens on one side in the axial direction, and the motor housing 23 opens on the other side in the axial direction.
  • the opening on one side in the axial direction of the motor housing 21 is closed by the motor housing 23, and the opening on the other side in the axial direction of the motor housing 23 is closed by the motor housing 21.
  • the motor housing 21 has a flange portion 21a extending outward in the radial direction at one end in the axial direction.
  • the flange portion 21a has a through hole 21aa that penetrates in the axial direction.
  • the motor housing 23 has a flange portion 23a extending radially outward at an end portion on the other side in the axial direction.
  • the flange portion 23a has a through hole 23aa penetrating in the axial direction.
  • the through hole 21aa and the through hole 23aa have the same axial position and the circumferential position, and the through hole 21aa and the through hole 23aa are continuous through holes.
  • the motor housing 21 and the motor housing 23 can be fixed by screwing so as to penetrate the through hole 21aa and the through hole 23aa.
  • FIG. 3 is a perspective view showing the motor housing 23 removed from the motor 10 of FIG.
  • the circuit board 80 has a shape corresponding to the shape of the tubular hole of the motor housing 21.
  • the circuit board 80 is circular.
  • the drive circuit 81 is composed of a plurality of electronic components.
  • the drive circuit 81 includes, for example, at least one of an IGBT, a bridge diode, a MOSFET, an IPM, and a DC / DC converter.
  • IGBT is an abbreviation for Integrated Gate Bipolar Transistor.
  • MOSFET is an abbreviation for metal-oxide-semiconductor field-effect transistor.
  • IPM is an abbreviation for Intelligent Power Module.
  • the drive circuit 81 is connected to the outside of the motor 10 via the wiring connected to the connector 82.
  • the wiring connected to the connector 82 passes through the through holes 83 provided in the motor housings 21 and 23.
  • FIG. 4 is a block diagram showing a configuration of a motor drive device according to an embodiment of the present invention.
  • the motor drive device 100 is a device that drives the motor 300.
  • the motor 30 of FIG. 1 is an example of the motor 300 of FIG.
  • the motor drive device 100 includes a microcomputer 101, a driver 102, and a current detection unit 103.
  • the microcomputer 101 has a duty ratio that sets a duty ratio of a PWM signal that drives the motor 300 according to the number of rotations acquired by the rotation number acquisition unit 104 and the rotation number acquisition unit 104 that acquires the number of rotations that rotate the motor 300.
  • the driver 102 drives the motor 300 based on the PWM signal output by the PWM signal output unit 106.
  • the current detection unit 103 is composed of, for example, a shunt resistor, and detects the current flowing through the motor 300.
  • the rotation speed acquisition unit 104, the duty ratio setting unit 105, and the PWM signal output unit 106 are realized by executing the program on the microcomputer 101.
  • the motor drive device 100 has a storage unit that stores a program executed by the microcomputer 101.
  • the rotation speed acquisition unit 104, the duty ratio setting unit 105, and the PWM signal output unit 106 may be realized by hardware.
  • the drive circuit 81 of FIG. 1 is an example of the microcomputer 101, the driver 102, and the current detection unit 103 of FIG. A part of the configuration of the motor drive device 100 of FIG. 4 may be provided outside the drive circuit 81 of FIG.
  • the motor drive device 100 may have a sensor for detecting the rotational position of the motor 300 and detect the rotational position of the motor 300 based on the detection result by the sensor.
  • the motor drive device 100 may perform sensorless control without having a sensor for detecting the rotational position of the motor 300.
  • the rotation speed setting unit 200 sets the rotation speed at which the motor 300 is rotated by the motor drive device 100.
  • the rotation speed acquisition unit 104 acquires the rotation speed for rotating the motor 300 set by the rotation speed setting unit 200.
  • the motor drive device 100 rotates the motor 300 at the rotation speed set by the rotation speed setting unit 200.
  • the motor drive device 100 may include a rotation speed setting unit 200.
  • the rotation speed setting unit 200 is, for example, a DIP switch mounted on the circuit board 80. When the rotation speed setting unit 200 is a DIP switch, the operator can set the rotation speed of the motor 300 by the on / off pattern of the DIP switch.
  • the rotation speed setting unit 200 constitutes the switch with a resistor, a jumper wire, solder, etc. provided on the circuit board 80, and sets the rotation speed for rotating the motor 300. Good. Further, the rotation speed acquisition unit 104 may acquire the rotation speed for rotating the motor by communication from the outside.
  • the duty ratio setting unit 105 sets the duty ratio to an initial value at the time of starting driving of the motor 300 or a predetermined value larger than the initial value.
  • the first control and the second control of setting the duty ratio to the initial value when the current detected by the current detection unit 103 reaches the second threshold value are executed.
  • the duty ratio setting unit 105 changes at least one of the first threshold value and the second threshold value according to the rotation speed acquired by the rotation speed acquisition unit 104.
  • the duty ratio setting unit 105 further has a third control for setting the duty ratio to 0% for a predetermined time when the current detected by the current detection unit 103 reaches the third threshold value.
  • the third threshold value is larger than the second threshold value
  • the second threshold value is larger than the first threshold value.
  • FIG. 5 is a flowchart showing a motor drive process by the motor drive device 100.
  • the motor drive device 100 waits for an instruction from the operator to start driving the motor.
  • the instruction to start driving the motor is, for example, power-on or switch operation.
  • the motor drive device 100 receives an instruction from the operator to start driving the motor (step S501: Yes)
  • the motor drive device 100 performs the rotation speed acquisition process in step S502, the duty ratio setting process in step S503, and the PWM signal output process in step S504. This is repeated until the instruction to stop the motor (step S505: Yes) by the operator is received.
  • the rotation speed acquisition process in step S502 is a process in which the rotation speed acquisition unit 104 acquires the rotation speed set by the rotation speed setting unit 200.
  • the rotation speed acquired in the rotation speed acquisition process is passed to the duty ratio setting process.
  • the duty ratio setting process of step S503 the duty ratio is set by the duty ratio setting unit 105 as described later with reference to FIGS. 6 to 9.
  • the duty ratio set in the duty ratio setting process is passed to the PWM signal output process.
  • the PWM signal output process in step S504 generates a PWM signal having a duty ratio set in the duty ratio setting process, and outputs the PWM signal to the driver 102.
  • FIG. 6 is a flowchart showing a duty ratio setting process by the motor drive device 100.
  • the duty ratio setting unit 105 sets the duty ratio to the initial value in step S601.
  • This initial value is a value predetermined according to the characteristics of the driving motor 300, and is a duty ratio for smoothly and efficiently starting the stopped motor 300. This initial value is, for example, 1%.
  • the duty ratio setting unit 105 changes the threshold value according to the rotation speed in step S602.
  • the threshold values to be changed here are the first threshold value used in the first control and the second threshold value used in the second control.
  • the duty ratio setting unit 105 may change only one of the first threshold value and the second threshold value.
  • the duty ratio setting unit 105 calculates a first threshold value according to the number of rotations at which the motor 300 is rotated. For example, the manufacturer or operator of the motor drive device 100 determines one rotation speed for rotating the motor 300 as the rotation speed at the initial setting, and when the motor 300 is rotated at the rotation speed at the initial setting, the motor 300 is operated.
  • the first threshold value that can be driven with high efficiency is obtained as the first threshold value at the time of initial setting.
  • the first threshold value at the time of this initial setting can be obtained, for example, by actually measuring the efficiency when the motor 300 is actually driven.
  • the manufacturer or operator of the motor drive device 100 stores the rotation speed at the time of initial setting and the corresponding first threshold value at the time of initial setting in the storage unit of the motor drive device 100.
  • the duty ratio setting unit 105 uses the rotation speed at the time of initial setting and the first threshold value at the time of initial setting stored in the storage unit, and the rotation speed delivered from the rotation speed acquisition unit 104 is the rotation speed at the time of initial setting.
  • the first threshold value when different from is calculated.
  • the rotation speed at the time of initial setting is N1
  • the first threshold value at the time of initial setting is X1
  • the rotation speed delivered from the rotation speed acquisition unit 104 is N2
  • the rotation speed delivered from the rotation speed acquisition unit 104 The first threshold value X2 used when driving the motor 300 with the number N2 is calculated by the equation (1).
  • X2 (N1 / N2) * X1 (where / is a division operator and * is a multiplication operator.) ... Equation (1) That is, when the rotation speed of the motor 300 is changed from N1 to N2, the duty ratio setting unit 105 changes the first threshold value from X1 to X2 calculated by the equation (1).
  • the duty ratio setting unit 105 may calculate the first threshold value by the equation (1) each time the rotation speed is handed over from the rotation speed acquisition unit 104. Further, the first threshold value is calculated in advance by the equation (1) for each rotation speed that can drive the motor 300, and this is stored in association with the rotation speed acquisition unit 104, for example, in a table format. The first threshold value corresponding to the number may be read from the table and used in the first control. For example, when the rotation speed is 1300 [rpm], the duty ratio setting unit 105 sets the first threshold value to 0.63A (amp), and when the rotation speed is 1550 [rpm], the first threshold value is 0.52A. (Amp), and when the rotation speed is 1800 [rpm], the first threshold value is set to 0.45 A (amp).
  • the duty ratio setting unit 105 calculates a second threshold value according to the number of rotations at which the motor 300 is rotated. For example, the manufacturer or operator of the motor drive device 100 determines one rotation speed for rotating the motor 300 as the rotation speed at the initial setting, and when the motor 300 is rotated at the rotation speed at the initial setting, the motor 300 is operated.
  • the second threshold value that can be driven with high efficiency is obtained as the second threshold value at the time of initial setting.
  • the second threshold value at the time of this initial setting can be obtained, for example, by actually measuring the efficiency when the motor 300 is actually driven.
  • the manufacturer or operator of the motor drive device 100 stores the rotation speed at the time of initial setting and the corresponding second threshold value at the time of initial setting in the storage unit of the motor drive device 100.
  • the duty ratio setting unit 105 uses the rotation speed at the time of initial setting and the second threshold value at the time of initial setting stored in the storage unit, and the rotation speed delivered from the rotation speed acquisition unit 104 is the rotation speed at the time of initial setting.
  • the second threshold value when different from is calculated.
  • the rotation speed at the time of initial setting is N1
  • the second threshold value at the time of initial setting is Y1
  • the rotation speed delivered from the rotation speed acquisition unit 104 is N2
  • the rotation speed delivered from the rotation speed acquisition unit 104 The second threshold value Y2 used when driving the motor 300 with the number N2 is calculated by the equation (2).
  • Y2 (N1 / N2) * Y1 (where / is a division operator and * is a multiplication operator.) ... Equation (2) That is, when the rotation speed of the motor 300 is changed from N1 to N2, the duty ratio setting unit 105 changes the second threshold value from Y1 to Y2 calculated by the equation (2).
  • the duty ratio setting unit 105 may calculate the second threshold value by the equation (2) each time the rotation speed is handed over from the rotation speed acquisition unit 104. Further, a second threshold value is calculated in advance by the equation (2) for each rotation speed that can drive the motor 300, and this is stored in association with, for example, in a table format, and the rotation is delivered from the rotation speed acquisition unit 104. The second threshold value corresponding to the number may be read from the table and used in the second control. For example, when the rotation speed is 1300 [rpm], the duty ratio setting unit 105 sets the second threshold value to 0.80 A (amp), and when the rotation speed is 1550 [rpm], the second threshold value is 0.67 A. (Amp), and when the rotation speed is 1800 [rpm], the second threshold is set to 0.58 A (amp).
  • the duty ratio setting unit 105 executes the first control in step S603, executes the second control in step S604, and executes the third control in step S605.
  • the first control and the second control the first threshold value and the second threshold value changed in step S602 are used.
  • the first control, the second control, and the third control are executed at a predetermined cycle, for example, by a timer interrupt while the motor 300 is being driven by the motor driving device 100. Details of the first control, the second control, and the third control will be described later with reference to FIGS. 7, 8 and 9.
  • the duty ratio setting unit 105 In driving the motor 300, the duty ratio setting unit 105 reaches the duty ratio corresponding to the rotation speed delivered from the rotation speed acquisition unit 104 from the initial value duty ratio set in step S601 at the start of rotation of the motor 300. Until, the duty ratio is gradually increased and updated. In step S606 and step S607, the process of updating the duty ratio is executed. In step S606, the duty ratio setting unit 105 determines whether the current duty is a duty ratio corresponding to the rotation speed delivered from the rotation speed acquisition unit 104. The duty ratio setting unit 105 returns to step S602 when the current duty is a duty ratio corresponding to the rotation speed delivered from the rotation speed acquisition unit 104 (step S606: Yes).
  • the duty ratio setting unit 105 proceeds to step S607 when the current duty is not the duty ratio corresponding to the rotation speed delivered from the rotation speed acquisition unit 104 (step S606: No).
  • the duty ratio setting unit 105 updates the duty ratio by increasing it by a predetermined amount (for example, 2%).
  • the duty ratio setting unit 105 returns to step S602 after step S607.
  • FIG. 7 is a flowchart showing the first control shown in FIG.
  • the first control executes the determination in step S701 when the number of overruns reaches a predetermined number of times (for example, 30 times) within a predetermined time (for example, 0.1 seconds) after the threshold value is exceeded.
  • the first control is performed, for example, approximately every 350 microseconds.
  • step S701 the duty ratio setting unit 105 determines whether the current detected by the current detection unit 103 has reached the first threshold value, that is, whether the current detected by the current detection unit 103 is equal to or higher than the first threshold value. .. If the current detected by the current detection unit 103 is not equal to or higher than the first threshold value (step S701: No), the current stays in step S701.
  • step S701: Yes the process proceeds to step S702.
  • the duty ratio setting unit 105 sets the duty ratio to a predetermined value in step S702.
  • This predetermined value may be a predetermined constant value, a predetermined value for each current duty ratio, or a value obtained by subtracting a predetermined ratio (for example, 5%) from the current duty ratio.
  • a predetermined ratio for example, 5%
  • the predetermined value set in step S702 is a value larger than the initial value of the duty ratio set in step S601.
  • the duty ratio setting unit 105 returns to step S701 following step S702.
  • the first control proceeds to S604 in FIG. 6 when a series of processes is completed, that is, when No in step S701 and when step S702 is completed.
  • FIG. 8 is a flowchart showing the second control shown in FIG.
  • the second control immediately executes the determination in step S801 when the threshold value is exceeded.
  • the second control is executed, for example, in several nanoseconds every PWM cycle.
  • the duty ratio setting unit 105 determines whether the current detected by the current detection unit 103 has reached the second threshold value, that is, whether the current detected by the current detection unit 103 is equal to or higher than the second threshold value. .. If the current detected by the current detection unit 103 is not equal to or greater than the second threshold value (step S801: No), the current stays in step S801. When the current detected by the current detection unit 103 is equal to or greater than the second threshold value (step S801: Yes), the process proceeds to step S802.
  • the duty ratio setting unit 105 sets the duty ratio to the initial value in step S802.
  • This initial value is the initial value of the duty ratio set in step S601. This initial value is, for example, 1%.
  • the duty ratio setting unit 105 returns to step S801 following step S802.
  • the second control proceeds to S605 in FIG. 6 when a series of processes is completed, that is, when No in step S801 and when step S802 is completed.
  • FIG. 9 is a flowchart showing the third control shown in FIG.
  • the third control immediately executes the determination in step S901 when the threshold value is exceeded.
  • the third control is performed, for example, approximately every 350 microseconds.
  • the duty ratio setting unit 105 determines whether the current detected by the current detection unit 103 has reached the third threshold value, that is, whether the current detected by the current detection unit 103 is equal to or higher than the third threshold value. .. If the current detected by the current detection unit 103 is not equal to or higher than the third threshold value (step S901: No), the current stays in step S901.
  • the third control proceeds to S606 in FIG.
  • the third threshold value is a threshold value for protecting the motor drive device 100 and the motor 300 from burning due to overcurrent, and is a constant value regardless of the rotation speed delivered from the rotation speed acquisition unit 104, for example. It is 1A (ampere).
  • the duty ratio setting unit 105 sets the duty ratio to 0% in step S902. That is, the motor 300 is stopped. After that, the duty ratio setting unit 105 waits for the elapse of a predetermined time (for example, 6 seconds) in step S903. When the predetermined time has elapsed (step S903: Yes), the microcomputer 101 resets the process and restarts the process from step S501.
  • a predetermined time for example, 6 seconds
  • the motor driving device for driving the motor corresponds to a rotation speed acquisition unit that acquires the rotation speed for rotating the motor and a rotation speed acquired by the rotation speed acquisition unit.
  • the duty ratio setting unit that sets the duty ratio of the PWM signal that drives the motor, the PWM signal output unit that outputs the PWM signal of the duty ratio set by the duty ratio setting unit, and the PWM signal output unit output.
  • a driver for driving the motor based on a PWM signal and a current detection unit for detecting the current flowing through the motor are provided, and the duty ratio setting unit has reached the first threshold value of the current detected by the current detection unit.
  • the first control that sets the duty ratio to an initial value at the time of starting driving of the motor or a predetermined value larger than the initial value, and when the current detected by the current detection unit reaches the second threshold value.
  • the second control for setting the duty ratio to the initial value is executed, and the duty ratio setting unit acquires at least one of the first threshold value and the second threshold value by the rotation speed acquisition unit. Change according to the number of rotations. Therefore, the motor can be driven efficiently. Further, the torque can be controlled by a simple method, and the temperature rise of the motor can be suppressed.
  • the duty ratio setting unit further has a third control for setting the duty ratio to 0% for a predetermined time when the current detected by the current detection unit reaches the third threshold value.
  • the third threshold value is larger than the second threshold value, and the second threshold value is larger than the first threshold value. Therefore, the current detected by the current detection unit cannot be limited by the first threshold value, and even when the current rises further, the current can be limited by reaching the second threshold value, and the motor is stabilized. Can be driven. Further, before the current detected by the current detection unit reaches the third threshold value and the motor is stopped, it can be limited by the current reaching the second threshold value, and the motor can be driven stably. Can be done.
  • the duty ratio setting unit executes the first control in the first cycle, and executes the second control in the second cycle shorter than the first cycle. Therefore, the frequency of executing the second control for comparing with the second threshold value is higher than the frequency for executing the first control for comparing the current detected by the current detection unit with the first threshold value, so that the current becomes the second threshold value. It is possible to more reliably detect the case where the value is reached, and the motor can be driven stably.
  • N1 is the motor rotation speed at the time of initial setting
  • X1 is the first threshold value at the time of initial setting. Therefore, since the changed first threshold value is obtained based on a highly reliable initial setting value, a reliable value can be obtained.
  • N1 is the motor rotation speed at the time of initial setting
  • Y1 is the second threshold value at the time of initial setting. Therefore, since the second threshold value after the change is obtained based on a highly reliable initial setting value, a reliable value can be obtained.
  • a rotation speed setting unit for setting the rotation speed for rotating the motor is further provided, and the rotation speed acquisition unit acquires the rotation speed set by the rotation speed setting unit. Therefore, the rotation speed of the motor can be set by the rotation speed setting unit.
  • the rotation speed setting unit is a switch on the circuit board. Therefore, the rotation speed of the motor can be easily set by the switch on the circuit board.
  • the rotation speed acquisition unit acquires the rotation speed at which the motor is rotated by communication from the outside. Therefore, the rotation speed of the motor can be easily set by communication from the outside.
  • the motor is a motor that rotates an axial fan. Therefore, in the motor for the axial flow fan, an appropriate threshold value can be set according to the rotation speed, and the temperature rise of the motor can be suppressed.
  • the application of the motor driven by the motor drive device of the above-described embodiment is not particularly limited.
  • the motor of the above-described embodiment is, for example, a motor that rotates an axial fan.
  • the above-mentioned configurations can be appropriately combined within a range that does not contradict each other.
  • Motor 21 Motor housing 30
  • Motor part 40 Stator 50
  • Rotor 80 Circuit board 81
  • Drive circuit 100
  • Motor drive device 101 Microcomputer 102
  • Driver 103 Current detection part 104
  • Duty cycle acquisition part 105
  • Duty ratio setting part 106
  • Rotation number setting part 300 motor

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  • Control Of Motors That Do Not Use Commutators (AREA)

Abstract

Dispositif d'entraînement de moteur destiné à entraîner un moteur comprenant : une unité d'acquisition de vitesse de rotation qui acquiert la vitesse de rotation permettant de faire tourner le moteur ; une unité de définition de rapport cyclique qui définit le rapport cyclique d'un signal PWM permettant d'entraîner le moteur, en fonction de la vitesse de rotation acquise par l'unité d'acquisition de vitesse de rotation ; une unité d'émission de signal PWM qui émet un signal PWM avec le rapport cyclique défini par l'unité de définition de rapport cyclique ; un circuit d'attaque qui entraîne le moteur sur la base du signal PWM émis par l'unité de sortie de signal PWM ; et une unité de détection de courant qui détecte un courant circulant à travers le moteur, l'unité de définition de rapport cyclique exécutant une première commande permettant de définir le rapport cyclique à une valeur initiale au moment de démarrage de l'entraînement du moteur ou à une valeur prédéterminée supérieure à la valeur initiale, lorsque le courant détecté par l'unité de détection de courant atteint une première valeur seuil, et une seconde commande permettant de définir le rapport cyclique à la valeur initiale, lorsque le courant détecté par l'unité de détection de courant atteint une seconde valeur seuil, et l'unité de définition de rapport cyclique modifiant la première valeur seuil et/ou la seconde valeur seuil en fonction de la vitesse de rotation acquise par l'unité d'acquisition de vitesse de rotation.
PCT/JP2020/041635 2019-12-02 2020-11-07 Dispositif d'entraînement de moteur WO2021111808A1 (fr)

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CN202080084443.7A CN114762244A (zh) 2019-12-02 2020-11-07 马达驱动装置

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011155160A1 (fr) * 2010-06-08 2011-12-15 パナソニック株式会社 Dispositif et procédé d'actionnement de moteur et moteur sans balais
JP2017041944A (ja) * 2015-08-18 2017-02-23 日本電産サーボ株式会社 モータユニット
JP2019134562A (ja) * 2018-01-30 2019-08-08 サンデン・オートモーティブコンポーネント株式会社 電動圧縮機

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011155160A1 (fr) * 2010-06-08 2011-12-15 パナソニック株式会社 Dispositif et procédé d'actionnement de moteur et moteur sans balais
JP2017041944A (ja) * 2015-08-18 2017-02-23 日本電産サーボ株式会社 モータユニット
JP2019134562A (ja) * 2018-01-30 2019-08-08 サンデン・オートモーティブコンポーネント株式会社 電動圧縮機

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JPWO2021111808A1 (fr) 2021-06-10

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