Motor drive control system, motor drive control device, and fan system

Abstract

To increase the maximum static pressure in a counter-rotating fan without increasing the air volume.SOLUTION: A motor drive control system 110 includes a first motor drive control device 111 and a second motor drive control device 112 provided corresponding to a first motor 21_1 and a second motor 21_2, respectively, and includes drive control units 3_1, 3_2 that generate drive control signals for controlling the drive of the corresponding first motor and second motor, and motor drive circuits 2_1, 2_2 that drive the corresponding first motor and second motor on the basis of the drive control signals, where the drive control unit 3_1 includes a load determination unit 39 that determines the load of the second motor on the basis of the second drive control signal acquired from the second motor drive control device, and the first drive control unit changes the rotation speed of the first motor in accordance with the determination of the load determination unit.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a motor drive control system, a motor drive control device, and a fan system. [Background technology]

[0002] In general, there is known a fan system equipped with a so-called counter-rotating axial flow fan in which the rotational axis centers of multiple impellers driven by a motor are aligned in the axial flow direction and the impellers rotate in different directions. In a motor drive control device that controls the drive of the motor in such a counter-rotating fan, a technique is known in which the motor rotation speed is changed to control the air volume and static pressure of the fan (for example, see Patent Document 1 or Patent Document 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2010-272704 A [Patent Document 2] Patent No. 5821565 Summary of the Invention [Problem to be solved by the invention]

[0004] In a conventional counter-rotating fan, the motor rotation speed is changed to satisfy a desired static pressure vs. air volume characteristic curve (PQ curve). In other words, in a motor drive control device that controls the motor of a conventional counter-rotating fan, when the maximum static pressure of the fan is increased, the maximum motor rotation speed is increased, which results in an increase in the maximum air volume. In a conventional motor drive control device that controls the motor of a counter-rotating fan, the increase in air volume, especially when there are no obstacles (free air), which is the condition when the fan shows the maximum air volume, leads to an increase in the motor's current consumption.

[0005] The present invention takes the above-mentioned problem as an example, and aims to provide a motor drive control system, a motor drive control device, and a fan system that can increase the maximum static pressure in a counter-rotating blower without increasing the air volume. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, the motor drive control system of the present invention is a motor drive control system including a first motor drive control device and a second motor drive control device provided corresponding to a first motor and a second motor, respectively, wherein the first motor drive control device and the second motor drive control device each have a drive control unit that generates a drive control signal for controlling the drive of the corresponding first motor and the second motor, and a motor drive circuit that drives the corresponding first motor and the second motor based on the drive control signal, and a first drive control unit that is the drive control unit in the first motor drive control device has a load judgment unit that performs a judgment of the load of the second motor based on a second drive control signal that is the drive control signal obtained from the second motor drive control device, and the first drive control unit changes the rotation speed of the first motor in accordance with the judgment of the load judgment unit. Effect of the Invention

[0007] According to the motor drive control system of the present invention, it is possible to increase the maximum static pressure in a counter-rotating fan without increasing the air volume. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a diagram illustrating an overview of a motor drive control system according to a first embodiment of the present invention. [Diagram 2] FIG. 1 is a diagram showing an example of a specific configuration of a fan system equipped with a motor drive control system according to a first embodiment. [Diagram 3]FIG. 2 is a perspective view showing a first fan and a second fan in the fan system according to the first embodiment. [Figure 4] FIG. 1 is a diagram showing an example of an air blowing system configured using a plurality of fan systems according to a first embodiment. [Diagram 5] 5 is a flowchart showing an example of a processing operation performed by a first drive control unit of the first motor drive control device according to the first embodiment. [Figure 6] FIG. 4 is a diagram showing PQ (static pressure vs. air volume characteristics) curves of a fan system equipped with the motor drive control system according to the present embodiment and a fan system of a comparative example. [Figure 7] FIG. 11 is a diagram showing a modification of a specific configuration of a fan system equipped with the motor drive control system according to the first embodiment. [Figure 8] FIG. 11 is a diagram showing an example of a specific configuration of a fan system equipped with a motor drive control system according to a second embodiment. [Figure 9] 10 is a flowchart showing an example of a processing operation performed by a first drive control unit of a first motor drive control device according to a second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] 1. Overview of the embodiment First, a typical embodiment of the invention disclosed in this application will be outlined. In the following description, as an example, reference characters in the drawings corresponding to the components of the invention are described in parentheses. Also, the outline of the following embodiment can be combined with the outline of other embodiments in any combination.

[0010] [1] A motor drive control system (110) according to a representative embodiment of the present invention is a motor drive control system including a first motor drive control device (111) and a second motor drive control device (112) provided corresponding to a first motor (21_1) and a second motor (21_2), respectively, and the first motor drive control device and the second motor drive control device each include drive control units (3_1, 3_2) that generate drive control signals (Sd_1, Sd_2) for controlling the drive of the corresponding first motor and second motor, respectively; and motor drive circuits (2_1, 2_2) that drive the corresponding first motor and second motor based on the drive control signal, and a first drive control unit (3_1) that is the drive control unit in the first motor drive control device has a load determination unit (39) that determines the load of the second motor based on a second drive control signal (Sd_2, S3_2) that is the drive control signal obtained from the second motor drive control device (112), and the first drive control unit changes the rotation speed of the first motor in accordance with the determination of the load determination unit.

[0011] [2] In the motor drive control system described in [1] above, the load determination unit may determine whether or not to change the rotation speed of the first motor based on a duty ratio value (S3_2, S4_2) included in the second drive control signal and a threshold value of the duty ratio included in the second drive control signal.

[0012] [3] In the motor drive control system described in [2] above, the load determination unit may increase the rotation speed of the first motor when the value of the duty ratio included in the second drive control signal exceeds a threshold value of the duty ratio included in the second drive control signal, and decrease the rotation speed of the first motor when the value of the duty ratio included in the second drive control signal does not exceed the threshold value of the duty ratio included in the second drive control signal.

[0013] [4] In the motor drive control system described in [1] to [3] above, the load determination unit may determine the load of the second motor based on a first drive control signal (Sd_1, S3_2), which is the drive control signal generated by the first drive control unit, and the second drive control signal.

[0014] [5] In the motor drive control system described in [1] to [4] above, the load determination unit may obtain the drive control signal (S3_2) from a second drive control unit (3_2) which is the drive control unit in the second motor drive control device.

[0015] [6] In the motor drive control system described in [1] to [4] above, the load determination unit may acquire the drive control signal (Sd_2) from a second motor drive circuit (2_2) which is the motor drive circuit in the second motor drive control device.

[0016] [7] A motor drive control device (111) according to a representative embodiment of the present invention is a motor drive control device provided in a motor drive control system (110) having a plurality of motors (21_1, 21_2) corresponding to each of the plurality of motors, the motor drive control device having a drive control unit (3_1) that generates a drive control signal (Sd_1) for controlling the drive of the motor, a motor drive circuit (2_1) that drives the motor based on the drive control signal, and a communication unit (35_1) that communicates with another motor drive control device (112) in the motor drive control system, the drive control unit having a load judgment unit (39) that judges the load of the other motor based on a drive control signal (Sd_2) of the other motor acquired from the other motor drive control device, and the drive control unit changes the rotation speed of the motor in accordance with the judgment of the load judgment unit.

[0017] [8] The motor drive control system described in [1] to [6] above may be configured as a fan system (1) including a first motor (21_1) and a second motor (21_2), and impellers (62_1, 62_2) attached to the first motor and the second motor, respectively, and configured to be rotatable by the rotational forces of the first motor and the second motor.

[0018] 2. Specific examples of embodiments DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific examples of embodiments of the present invention will be described with reference to the drawings. In the following description, components common to the respective embodiments are designated by the same reference numerals, and repeated description will be omitted.

[0019] First Embodiment First, before describing a specific configuration of this embodiment, an overview of the motor drive control system will be described.

[0020] FIG. 1 is a diagram illustrating an overview of a motor drive control system according to a first embodiment.

[0021] 1, this embodiment will be described taking as an example a motor drive control system 110 for driving two fans by two motors. The motor drive control system 110 of this embodiment includes a first motor drive control device 111 having a motor drive circuit 2_1 and a first drive control section 3_1, a second motor drive control device 112 having a motor drive circuit 2_2 and a second drive control section 3_2, and a communication line 45 connecting the first motor drive control device 111 and the second motor drive control device 112 to communicate with each other.

[0022] The motor drive control system 110 is composed of two integrated circuit devices (ICs): an integrated circuit device (IC) constituting a first motor drive control device 111 and an integrated circuit device (IC) constituting a second motor drive control device 112.

[0023] Fig. 2 is a diagram showing an example of a specific configuration of a fan system 1 equipped with a motor drive control system according to the present embodiment. Fig. 3 is a perspective view showing a first fan 11 and a second fan 12 in the fan system 1 according to the present embodiment.

[0024] 2 and 3, the fan system 1 is equipped with the motor drive control system 110 described above, and is configured as a blower device including two blowers 11 and 12 (first blower 11 and second blower 12) each having an impeller 62_1 and 62_2 (first impeller 62_1 and second impeller 62_2) and a motor 21_1 and 21_2 (first motor 21_1 and second motor 21_2) for rotating the impeller 62_1 and 62_2. In this embodiment, the fan system 1 has the first blower 11 on the outlet side (exhaust side) and the second blower 12 on the inlet side (intake side).

[0025] The first fan 11 and the second fan 12 are axial fans arranged such that the rotation axis centers of the impellers 62_1 and 62_2 are aligned in the axial flow direction. The first fan 11 and the second fan 12 rotate the impellers 62_1 and 62_2 in different directions. In other words, the rotation direction of the impeller 62_1 of the first fan 11 is opposite to the rotation direction of the impeller 62_2 of the second fan 12, as viewed in the axial direction. That is, the fan system 1 is a so-called counter-rotating fan. In this embodiment, the fan system 1 is a fan motor that cools the inside of an electronic device, such as a computer or an office automation device, by discharging heat generated inside the electronic device to the outside by wind force.

[0026] The first blower 11 includes a first motor 21_1 that rotates a first impeller 62_1 of the first blower 11, and a first motor drive control device 111 that drives the first motor 21_1. The first impeller 62_1 is attached to the rotating shaft of the rotor of the first motor 21_1.

[0027] The second blower 12 includes a second motor 21_2 that rotates a second impeller 62_2 of the second blower 12, and a second motor drive control device 112 that drives the second motor 21_2. The second impeller 62_2 is attached to the rotating shaft of the rotor of the second motor 21_2.

[0028] FIG. 4 is a diagram showing an example of an air blowing system 801 configured using a plurality of fan systems 1 according to the present embodiment.

[0029] As shown in Fig. 4, a plurality of fan systems 1 can be used together. For example, a blower system 801 has one control device 800 and four fan systems 1 (fan systems 1A, 1B, 1C, 1D). Each of the fan systems 1 is connected to the control device 800. The first fan 11 and the second fan 12 of each of the fan systems 1 drive the first motor 21_1 and the second motor 21_2 based on a speed command signal Sc input from the control device 800.

[0030] The air blowing system 801 blows air from each of the fan systems 1 to an electronic device 900, such as a computer, which is a cooling target. The electronic device 900 is composed of a power supply device, a CPU, a memory, a storage device, peripheral devices, and the like. The electronic device 900 is cooled by air blown from the fan system 1 constituting the air blowing system 801 to the inside of the electronic device 900, and can maintain a normal operating state. As shown in Figs. 2 to 4, in this embodiment, the fan system 1 is a fan motor that cools the inside of the electronic device, such as a computer or office automation equipment, by discharging heat generated inside the electronic device to the outside by wind force.

[0031] Hereinafter, the first impeller 62_1 and the second impeller 62_2 may be referred to as impellers 62_1 and 62_2 without distinction. The first motor 21_1 and the second motor 21_2 may be referred to as motors 21_1 and 21_2 without distinction. Furthermore, the first motor drive control device 111 and the second motor drive control device 112 may be referred to as motor drive control devices 111 and 112 without distinction.

[0032] In this embodiment, the first motor 21_1 and the second motor 21_2 are, for example, three-phase brushless motors. The motor drive control devices 111 and 112 rotate the first motor 21_1 and the second motor 21_2 by periodically supplying drive currents to the coils of the first motor 21_1 and the second motor 21_2.

[0033] A first motor drive control device 111 used for the first blower 11 and a second motor drive control device 112 used for the second blower 12 are connected to each other by a communication line 45. The first motor drive control device 111, the second motor drive control device 112, and the communication line 45 form a motor drive control system 110.

[0034] The fan system 1 is connected to a control device 800, which is an example of an external device. In this embodiment, the control device 800 outputs a speed command signal Sc corresponding to the rotation speed (number of rotations) of the first motor 21_1 and the second motor 21_2 to each of the blowers 11 and 12. The speed command signal Sc is input to each of the motor drive control devices 111 and 112. Each of the motor drive control devices 111 and 112 can drive the first motor 21_1 and the second motor 21_2 at a rotation speed corresponding to the speed command signal Sc. Each of the motor drive control devices 111 and 112 outputs a rotation speed signal S (e.g., an FG signal, etc.) corresponding to the first motor 21_1 and the second motor 21_2 to the control device 800. The control device 800 can detect the driving state of each of the blowers 11 and 12 based on the rotation speed signal S, and can control the speed command signal Sc to be output accordingly.

[0035] The first motor drive control device 111 and the second motor drive control device 112 have the same hardware configuration, except that only the first motor drive control device 111 is provided with a load determination unit 39. In this embodiment, the first motor drive control device 111 and the second motor drive control device 112 perform substantially the same operations, except for the load determination unit 39 and the specific operations of the parts that communicate with each other, as described below. Below, components common to the configuration of the first motor drive control device 111 and the second motor drive control device 112 will be described based on the first motor drive control device 111 as a representative, and differences will be described separately.

[0036] Each of the motor drive control devices 111 and 112 has a motor drive circuit 2_1 or 2_2 and a drive control unit 3_1 or 3_2. Note that the components of the motor drive control devices 111 and 112 shown in Fig. 2 are only a part of the whole, and the motor drive control devices 111 and 112 may have other components in addition to those shown in Fig. 1.

[0037] In this embodiment, each of the motor drive control devices 111, 112 is an individual integrated circuit device (IC) in which the drive control units 3_1, 3_2 and the motor drive circuits 2_1, 2_2 are packaged. The motor drive control devices 111, 112 configured as individual integrated circuit devices (IC) may be packaged as one integrated circuit device, or the motor drive control devices 111, 112 may be packaged together with other devices to configure one integrated circuit device. Also, the drive control units 3_1, 3_2 and the motor drive circuits 2_1, 2_2 may be packaged as different integrated circuit devices.

[0038] The motor drive circuits 2_1 and 2_2 drive the motors 21_1 and 21_2 to be driven, based on drive control signals Sd_1 and Sd_2 generated by the first drive control section 3_1 and the second drive control section 3_2, respectively.

[0039] The motor drive circuits 2_1 and 2_2 each include an inverter circuit and a pre-drive circuit. The motor drive circuits 2_1 and 2_2 output drive signals to the motors 21_1 and 21_2 based on drive control signals Sd_1 and Sd_2 output from the drive control units 3_1 and 3_2 to drive the motors 21_1 and 21_2.

[0040] The pre-drive circuits generate output signals for driving the inverter circuits based on the control by the drive control units 3_1 and 3_2, and output the generated output signals to the inverter circuits. The inverter circuits output drive signals to the motors 21_1 and 21_2 based on the output signals output from the pre-drive circuits, and energize the coils of the motors 21_1 and 21_2.

[0041] The drive control sections 3_1 and 3_2 receive speed command signals Sc_1 and Sc_2 output from the control device 800. The drive control sections 3_1 and 3_2 also output rotation speed signals S_1 and S_2 to the control device 800.

[0042] The speed command signals Sc_1 and Sc_2 are signals related to the rotation speeds of the motors 21_1 and 21_2. For example, the speed command signals Sc_1 and Sc_2 are PWM (Pulse Width Modulation) signals corresponding to the target rotation speeds of the motors 21_1 and 21_2. In other words, the speed command signals Sc_1 and Sc_2 are speed command information corresponding to the target values ​​of the rotation speeds of the motors 21_1 and 21_2. Note that clock signals may be input as the speed command signals Sc_1 and Sc_2.

[0043] In this embodiment, three Hall signals (position detection signals) Hu, Hv, and Hw are input to the drive control units 3_1 and 3_2 from the motors 21_1 and 21_2. The Hall signals Hu, Hv, and Hw are, for example, output signals of three Hall (HALL) elements 25u, 25v, and 25w arranged in the motors 21_1 and 21_2. The Hall signals Hu, Hv, and Hw are signals corresponding to the rotation of the rotor of the motor 21_1. The drive control units 3_1 and 3_2 detect the rotation states of the motors 21_1 and 21_2 using the Hall signals Hu, Hv, and Hw, and control the driving of the motors 21_1 and 21_2. That is, the drive control units 3_1 and 3_2 detect the rotation positions of the rotors of the motors 21_1 and 21_2 using the Hall signals Hu, Hv, and Hw, and control the driving of the motors 21_1 and 21_2. Further, the drive control units 3_1, 3_2 can obtain actual rotation speed information regarding the actual rotation speed of the rotors of the motors 21_1, 21_2 by using the Hall signals Hu, Hv, Hw, and control the driving of the motors 21_1, 21_2.

[0044] The three Hall elements 25_1, 25_2 (for the sake of simplicity, one Hall element 25_1, 25_2 is shown for each of the motors 21_1, 21_2 in FIG. 2) that output the Hall signals Hu, Hv, Hw are arranged around the rotors of the motors 21_1, 21_2 at approximately equal intervals (at intervals of 120 degrees from adjacent elements), for example. The three Hall elements 25 detect the magnetic poles of the rotors of the motors 21_1, 21_2, and output the Hall signals Hu, Hv, Hw, respectively.

[0045] In addition, the drive control units 3_1 and 3_2 may be configured to receive other information related to the rotational states of the motors 21_1 and 21_2 in addition to or instead of the Hall signals Hu, Hv, and Hw. For example, a signal (pattern FG) generated using a coil pattern provided on a substrate on the rotor side may be input as an FG signal corresponding to the rotation of the rotors of the motors 21_1 and 21_2. Also, the drive control units 3_1 and 3_2 may be configured to detect the rotational states of the motors 21_1 and 21_2 based on the detection result of a rotational position detection circuit that detects the back electromotive voltage induced in each phase (U, V, and W phase) of the motors 21_1 and 21_2. An encoder, a resolver, or the like may be provided to detect information such as the rotational speed of the motors 21_1 and 21_2.

[0046] The drive control units 3_1 and 3_2 output drive control signals Sd_1 and Sd_2 for driving the motors 21_1 and 21_2 based on the input signals. Specifically, the drive control units 3_1 and 3_2 output the drive control signals Sd_1 and Sd_2 to the motor drive circuits 2_1 and 2_2 based on the speed command signals Sc_1 and Sc_2 and the Hall signals Hu, Hv, and Hw.

[0047] The drive control units 3_1 and 3_2 output drive control signals Sd_1 and Sd_2 for driving the motors 21_1 and 21_2 to the motor drive circuits 2_1 and 2_2 to control the rotation of the motors 21_1 and 21_2. The motor drive circuits 2_1 and 2_2 output drive signals to the motors 21_1 and 21_2 based on the drive control signals Sd_1 and Sd_2 to drive the motors 21_1 and 21_2.

[0048] In order to realize the process of generating the drive control signal Sd_1 for controlling the drive of the motor 21_1 described above, the drive control unit 3_1 as the first drive control unit has a motor drive control processing unit 30_1, a communication unit 35_1, and a load determination unit 39 as functional units. The drive control unit 3_1 realizes the motor drive control function and the load determination function by these functional units. In addition, in order to realize the process of generating the drive control signal Sd_2 for controlling the drive of the motor 21_2 described above, the drive control unit 3_2 as the second drive control unit has a motor drive control processing unit 30_2 and a communication unit 35_2 as functional units. The drive control unit 3_2 realizes the motor drive control function by these functional units. In this way, the drive control units 3_1 and 3_2 have almost the same configuration, except that only the drive control unit 3_1 is provided with the load determination unit 39.

[0049] The functional units in these drive control units 3_1 and 3_2 are realized, for example, by a program processing device. For example, in a program processing device (for example, a microcontroller) having a configuration in which a processor such as a CPU, various storage devices such as a RAM and a ROM, and peripheral circuits such as a counter (timer), an A / D conversion circuit, a D / A conversion circuit, a clock generation circuit, and an input / output I / F circuit are connected to each other via a bus or a dedicated line, the CPU executes various arithmetic processing according to a program stored in the memory, and controls the peripheral circuits such as the A / D conversion circuit and the input / output interface circuit based on the processing results, thereby realizing the above-mentioned functional blocks.

[0050] The motor drive control processing units 30_1 and 30_2 are processing units that execute a motor drive control process to generate drive control signals Sd_1 and Sd_2 for controlling the drive of the motor. The motor drive control processing units 30_1 and 30_2 execute a motor drive control process to generate drive control signals Sd_1 and Sd_2 for the motor drive circuits 2_1 and 2_2, respectively, based on a drive command from an external device, for example.

[0051] The motor drive control processors 30_1 and 30_2 have, as functional units, rotation speed calculators 31_1 and 31_2, speed command analyzers 32_1 and 32_2, PWM command units 33_1 and 33_2, and PWM signal generators 34_1 and 34_2.

[0052] The rotation speed calculation units 31_1 and 31_2 receive the Hall signals Hu, Hv, and Hw output from the three Hall elements 25_1 and 25_2. The rotation speed calculation units 31_1 and 31_2 output position signals indicating the positional relationship between each phase and the rotors of the motors 21_1 and 21_2 based on the input Hall signals Hu, Hv, and Hw. The rotation speed calculation units 31_1 and 31_2 also generate and output actual rotation speed information corresponding to the period of the position signal based on the Hall signals Hu, Hv, and Hw. That is, the rotation speed calculation units 31_1 and 31_2 output actual rotation speed information related to the actual rotation speed of the rotors of the motors 21_1 and 21_2. In FIG. 2, the actual rotation signals S2_1 and S2_2 are shown together with the position signals and the actual rotation speed information. The actual rotation signals S2_1 and S2_2 are output to the PWM command units 33_1 and 33_2.

[0053] The rotation speed calculation units 31_1 and 31_2 can output the generated actual rotation speed information to the control device 800 as rotation speed signals S_1 and S_2.

[0054] The speed command analysis units 32_1, 32_2 receive the speed command signals Sc_1, Sc_2. The speed command analysis units 32_1, 32_2 output target rotation speed signals S1_1, S1_2 indicating target rotation speeds of the motors 21_1, 21_2 based on the speed command signals Sc_1, Sc_2. The target rotation speed signals S1_1, S1_2 are PWM signals indicating duty ratios corresponding to the speed command signals Sc_1, Sc_2. The target rotation speed signals S1_1, S1_2 are output to the PWM command units 33_1, 33_2.

[0055] The PWM command units 33_1 and 33_2 are input with the actual rotation signals S2_1 and S2_2 output from the rotation speed calculation units 31_1 and 31_2 and the target rotation speed signals S1_1 and S1_2 output from the speed command analysis units 32_1 and 32_2. The PWM command units 33_1 and 33_2 generate and output PWM setting instruction signals S3_1 and S3_2 adjusted by so-called feedback control processing based on the actual rotation signals S2_1 and S2_2 and the target rotation speed signals S1_1 and S1_2 so that the actual rotation signals S2_1 and S2_2 match the target rotation speed signals S1_1 and S1_2. The PWM setting instruction signals S3_1 and S3_2 are output to the PWM signal generation units 34_1 and 34_2. The PWM setting instruction signals S3_1 and S3_2 are signals indicating the duty ratio for outputting the drive control signals Sd_1 and Sd_2.

[0056] Further, an adjustment signal S9_1 output from the communication processing unit 37_1 as described later is input to the PWM command unit 33_1. When the adjustment signal S9_1 is input from the communication processing unit 37_1, the PWM command unit 33_1 adjusts the duty ratio of the PWM setting instruction signal S3_1 in accordance with the content of the input adjustment signal S9_1 and outputs the adjusted signal.

[0057] The PWM setting instruction signals S3_1 and S3_2 are input to the PWM signal generating units 34_1 and 34_2. The PWM signal generating units 34_1 and 34_2 generate PWM signals S4_1 and S4_2 for driving the motor driving circuits 2_1 and 2_2 based on the PWM setting instruction signals S3_1 and S3_2. The PWM signals S4_1 and S4_2 are, for example, signals having the same duty ratio as the PWM setting instruction signals S3_1 and S3_2. In other words, the PWM signals S4_1 and S4_2 are signals having a duty ratio corresponding to the PWM setting instruction signals S3_1 and S3_2.

[0058] The PWM signals S4_1 and S4_2 output from the PWM signal generating units 34_1 and 34_2 are output as drive control signals Sd_1 and Sd_2 from the drive control units 3_1 and 3_2 to the motor drive circuits 2_1 and 2_2. As a result, drive signals are output from the motor drive circuits 2_1 and 2_2 to the motors 21_1 and 21_2, and the motors 21_1 and 21_2 are driven.

[0059] The PWM setting instruction signal S3_2 generated by the PWM command unit 33_2 of the second motor drive control device 112 not provided with the load determination unit 39 is output to the communication unit 35_2. The PWM setting instruction signal S3_2 output to the communication unit 35_2 is sent to the load determination unit 39 of the first motor drive control device 111 by the communication units 35_1 and 35_2 via the communication line 45.

[0060] As described above, the load determining unit 39 is provided only in the drive control unit 3_1 of the first motor drive control device 111. The load determining unit 39 executes determination of the load of the motor 21_2 based on at least the drive control signal Sd_2 of the second motor drive control device 112, specifically, the PWM setting instruction signal S3_2 which is a signal indicating a duty ratio output by the PWM command unit 33_2. The load determining unit 39 determines whether or not to change the rotation speed of the motor 21_1 according to the load of the motor 21_2.

[0061] The process of determining the load of the second motor 21_2 by the load determination unit 39 is performed, for example, as follows. Based on the duty ratio of the PWM setting instruction signal S3_2 and a predetermined threshold value of this duty ratio, the load determination unit 39 determines whether or not the duty ratio of the second motor 21_2 exceeds a threshold value, that is, whether or not a predetermined load is applied to the second motor 21_2. The threshold value of the duty ratio of the PWM setting instruction signal S3_2 is stored in a data table held by the drive control unit 3_1 of the first motor drive control device 111.

[0062] Specifically, the load determination unit 39 determines that a predetermined load is applied to the motor 21_2 when the duty ratio indicated by the PWM setting instruction signal S3_2 exceeds the duty ratio threshold value. In this case, the load determination unit 39 outputs an adjustment signal S9_1 to the PWM instruction unit 33_1 via the communication processing unit 37_1 to change the duty ratio of the PWM setting instruction signal S3_1 output from the PWM instruction unit 33_1 to increase the rotation speed of the motor 21_1. The PWM instruction unit 33_1 can change (increase) the duty ratio included in the PWM setting instruction signal S3_1 by the adjustment signal S9_1. Therefore, in the fan system 1, the rotation speed of the motor 21_1 can be increased to increase the static pressure output from the fan system 1.

[0063] On the other hand, the load determination unit 39 determines that the load of the motor 21_2 has decreased when the duty ratio indicated by the PWM setting instruction signal S3_2 does not exceed the duty ratio threshold value. In this case, the load determination unit 39 outputs an adjustment signal S9_1 for changing the duty ratio of the PWM setting instruction signal S3_1 output from the PWM instruction unit 33_1 to the PWM instruction unit 33_1 via the communication processing unit 37_1 to decrease the rotation speed of the motor 21_1. The PWM instruction unit 33_1 can change (decrease) the duty ratio included in the PWM setting instruction signal S3_1 by the adjustment signal S9_1. Therefore, in the fan system 1, the rotation speed of the motor 21_1 can be decreased to decrease the static pressure output from the fan system 1.

[0064] The communication units 35_1 and 35_2 are processing units which perform communication via a communication line 45. The communication units 35_1 and 35_2 have, as functional units, transmission / reception units 36_1 and 36_2 and communication processing units 37_1 and 37_2.

[0065] The transmitting / receiving units 36_1 and 36_2 are interfaces for communication. The transmitting / receiving unit 36_1 of the first motor drive control device 111 is connected to the transmitting / receiving unit 36_2 of the second motor drive control device 112 via a communication line 45. The communication line 45 may be one or more, and the communication may be serial communication or parallel communication. The transmitting / receiving unit 36_1 of the first motor drive control device 111 can communicate with the transmitting / receiving unit 36_2 of the second motor drive control device 112 and the control device 800, which is an example of a higher-level device. Control of communication in the first motor drive control device 111 is performed by a communication processing unit 37_1, and control of communication in the second motor drive control device 112 is performed by a communication processing unit 37_2.

[0066] The communication processing units 37_1, 37_2 control the operation of the transmission / reception units 36_1, 36_2 and control communication between the first motor drive control device 111 and the second motor drive control device 112. That is, the communication processing unit 37_1 of the first motor drive control device 111 controls the transmission / reception unit 36_1 of the first motor drive control device 111 and communicates with the second motor drive control device 112. The communication processing unit 37_2 of the second motor drive control device 112 controls the transmission / reception unit 36_2 of the second motor drive control device 112 and communicates with the first motor drive control device 111.

[0067] The communication processing units 37_1 and 37_2, for example, mediate a process of transmitting the PWM setting instruction signal S3_2 output by the PWM command unit 33_2 to the transmitter / receiver unit 36_1 of the first motor drive control device 111. Specifically, the communication processing unit 37_1 sends a request to the second motor drive control device 112 to obtain the PWM setting instruction signal S3_2, and obtains the PWM setting instruction signal S3_2 obtained by the communication processing unit 37_2.

[0068] The communication processing unit 37_1 of the first motor drive control device 111 outputs the adjustment signal S9_1 generated and output by the load determining unit 39 based on the load determination result to the PWM command unit 33_1 via the transmitting / receiving unit 36_1.

[0069] In this embodiment, the first motor drive control device 111 and the second motor drive control device 112 may be configured to communicate with each other, with the first motor drive control device 111 as a master and the second motor drive control device 112 as a slave. For example, the communication processing unit 37_1 of the first motor drive control device 111 makes an inquiry to the second motor drive control device 112 about a PWM setting instruction signal S3_2 for the PWM command unit 33_2 of the second motor drive control device 112 via the transmitting / receiving unit 36_1. When the communication processing unit 37_2 of the second motor drive control device 112 receives the inquiry from the first motor drive control device 111 via the transmitting / receiving unit 36_2, it transmits the PWM setting instruction signal S3_2 as a message regarding the state of the second motor drive control device 112, i.e., the driving state of the second motor 21_2, to the first motor drive control device 111 via the transmitting / receiving unit 36_2 as a response to the inquiry. In addition, the first motor drive control device 111 and the second motor drive control device 112 can communicate with each other, for example, by the first motor drive control device 111 sending a predetermined instruction command to the second motor drive control device 112, and the second motor drive control device 112 sending a response to the instruction command to the first motor drive control device 111.

[0070] [Motor drive control system operation] Next, the operation of motor drive control system 110 having the above-described configuration will be described with reference to a flowchart.

[0071] FIG. 5 is a flowchart showing an example of a processing operation performed by the first drive control section 3_1 of the first motor drive control device 111 according to the first embodiment.

[0072] In the motor drive control system 110, the load judgment unit 39 in the first drive control unit 3_1 of the first motor drive control device 111 acquires a PWM setting instruction signal S3_2 as the duty ratio of the second motor 21_2 from the PWM command unit 33_2 in the second drive control unit 3_2 of the second motor drive control device 112 via the communication units 35_1, 35_2 (step S101).

[0073] The load determination unit 39 compares the duty ratio of the PWM setting instruction signal S3_2 acquired from the PWM command unit 33_2 with a predetermined threshold value of the duty ratio to determine whether or not the duty ratio of the second motor 21_2 exceeds the threshold value (step S102). If the duty ratio of the second motor 21_2 does not exceed the threshold value (S102: NO), the load determination unit 39 repeats the processes of S101 and S102.

[0074] When the duty ratio of the second motor 21_2 exceeds the threshold value (S102: YES), the load determination unit 39 outputs the adjustment signal S9_1 to the PWM command unit 33_1 via the communication processing unit 37_1. The PWM command unit 33_1 changes the duty ratio of the PWM setting instruction signal S3_1 in response to the adjustment signal S9_1 to increase the rotation speed of the motor 21_1 (step S103).

[0075] The load determination unit 39 acquires a PWM setting instruction signal S3_2 as the duty ratio of the second motor 21_2 after changing the rotation speed from the PWM command unit 33_2 in the second drive control unit 3_2 of the second motor drive control device 112 via the communication units 35_1, 35_2 (step S104).

[0076] The load determination unit 39 compares the duty ratio of the PWM setting instruction signal S3_2 acquired from the PWM command unit 33_2 with a predetermined threshold value of the duty ratio to determine whether or not the duty ratio of the second motor 21_2 is below the threshold value (step S105). If the duty ratio of the second motor 21_2 is not below the threshold value (S105: NO), the load determination unit 39 repeats the processes of S104 and S105.

[0077] On the other hand, when the duty ratio of the second motor 21_2 is below the threshold value (S105: YES), the load determining unit 39 outputs an adjustment signal S9_1 for decreasing the rotation speed of the first motor 21_1 to the PWM command unit 33_1 via the communication processing unit 37_1. The PWM command unit 33_1 changes the duty ratio of the PWM setting instruction signal S3_1 in response to the adjustment signal S9_1 to decrease the rotation speed of the motor 21_1 (step S106). After changing the rotation speed, the load determining unit 39 returns to the process of S101.

[0078] As described above, the load determination unit 39 realized by the first drive control unit 3_1 of the first motor drive control device 111 in the fan system 1 compares the duty ratio of the PWM setting instruction signal S3_2 acquired from the PWM command unit 33_2 with a predetermined threshold value of the duty ratio, and changes the PWM setting instruction signal S3_1 according to the threshold value. In the fan system 1, the rotation speed of the first motor 21_1 on the outlet side is increased or decreased based on the duty ratio indicating the load of the second motor 21_2 on the inlet side, so that the first motor drive control device 111 can change, i.e., increase or decrease, the maximum static pressure without changing the air volume regardless of the rotation speed of the motor 21_1.

[0079] 6 is a diagram showing PQ (static pressure vs. air volume characteristic) curves of the fan system 1 equipped with the motor drive control system according to the present embodiment and a comparative fan system. In FIG. 6, the vertical axis represents static pressure P [Pa] and the horizontal axis represents air volume Q [m 3 / min] is shown.

[0080] In FIG. 6, the curve indicated by the solid line is the PQ curve of the fan system 1. In FIG. 6, the curve indicated by the two-dot chain line is the PQ curve of the fan system of the first comparative example. In FIG. 6, the curve indicated by the one-dot chain line is the PQ curve of the fan system of the second comparative example. The fan systems of the first and second comparative examples are different from the fan system 1 in that the first drive control unit 3_1 in the first motor drive control device 111 does not have a load determination unit 39. The PQ curve of the fan system of the first comparative example is a diagram when the inlet side fan rotates at 18000 rpm and the outlet side fan rotates at 13000 rpm. The PQ curve of the fan system of the second comparative example is a diagram when the inlet side fan rotates at 18000 rpm and the outlet side fan rotates at 16000 rpm.

[0081] 6, compared to the fan systems of the first and second comparative examples, fan system 1 can obtain PQ curve characteristics that increase maximum static pressure P without increasing maximum air volume Q. Furthermore, fan system 1 can increase maximum static pressure P without increasing maximum air volume Q, so the drive current of the motor can be reduced.

[0082] 7 is a diagram showing a modified example of the specific configuration of fan system 10 equipped with the motor drive control system according to the present embodiment. Fan system 10 shown in FIG. 7 differs from fan system 1 described above in the following configuration.

[0083] That is, in the fan system 1, the load determination unit 39, which determines the load of the second motor 21_2, acquires the PWM setting instruction signal S3_2 output by the PWM command unit 33_2 as a signal indicating the duty ratio of the second motor 21_2 via the communication units 35_2 and 35_1.

[0084] On the other hand, in the fan system 10, the load determination unit 39 acquires the drive control signal Sd_2 output by the motor drive circuit 2_2 as a signal indicating the duty ratio of the second motor 21_2 via the communication units 35_2 and 35_1. As described above, the drive control signal Sd_2 is a signal output from the drive control unit 3_2 to the motor drive circuit 2_2. The drive control signal Sd_2 is the PWM signal S4_2 output from the PWM signal generation unit 34_2, and is a signal having a duty ratio corresponding to the PWM setting instruction signal S3_2. Therefore, even if the load determination unit 39 in the fan system 10 acquires the drive control signal Sd_2 in order to determine the load of the second motor 21_2, it can perform the same processing as the load determination unit 39 of the fan system 1 described above.

[0085] Second Embodiment Next, a motor drive control system according to a second embodiment of the present invention will be described, focusing on the differences from the motor drive control system according to the first embodiment previously described.

[0086] Fig. 8 is a diagram showing an example of a specific configuration of a fan system 20 equipped with a motor drive control system according to the second embodiment. The fan system 20 shown in Fig. 8 differs from the fan systems 1 and 10 described above in the following configuration.

[0087] That is, in the fan systems 1 and 10, the load determination unit 39 acquires, as a signal indicating the duty ratio of the second motor 21_2, the PWM setting instruction signal S3_2 output by the PWM command unit 33_2 or the drive control signal Sd_2 output by the motor drive circuit 2_2 via the communication units 35_2 and 35_1, and determines the load of the second motor 21_2.

[0088] On the other hand, in the fan system 20, the load determination unit 39 acquires the PWM setting instruction signal S3_1 output by the PWM command unit 33_1 as a signal indicating the duty ratio of the first motor 21_1, in addition to the signal indicating the duty ratio of the second motor 21_2, determines the load of the first motor 21_1 and the load of the second motor 21_2, and determines whether or not to change the rotation speed of the motor 21_1 depending on the loads of the motors 21_1 and 21_2.

[0089] FIG. 9 is a flowchart showing an example of a processing operation performed by the first drive control unit of the first motor drive control device according to the second embodiment.

[0090] In the motor drive control system 110, the load judgment unit 39 in the first drive control unit 3_1 of the first motor drive control device 111 acquires a PWM setting instruction signal S3_2 as the duty ratio of the second motor 21_2 from the PWM command unit 33_2 in the second drive control unit 3_2 of the second motor drive control device 112 via the communication units 35_1, 35_2 (step S201).

[0091] The load determination unit 39 compares the duty ratio of the PWM setting instruction signal S3_2 acquired from the PWM command unit 33_2 with a predetermined threshold value of the duty ratio to determine whether or not the duty ratio of the second motor 21_2 exceeds the threshold value (step S202). If the duty ratio of the second motor 21_2 does not exceed the threshold value (S202: NO), the load determination unit 39 repeats the processes of S201 and S202.

[0092] When the duty ratio of the second motor 21_2 exceeds the threshold value (S202: YES), the load determination unit 39 outputs the adjustment signal S9_1 to the PWM command unit 33_1 via the communication processing unit 37_1. The PWM command unit 33_1 changes the duty ratio of the PWM setting instruction signal S3_1 in response to the adjustment signal S9_1 to increase the rotation speed of the motor 21_1 (step S203).

[0093] The load determining unit 39 acquires a PWM setting instruction signal S3_1 as the duty ratio of the first motor 21_1 from the PWM command unit 33_1 in the first drive control unit 3_1 via the communication unit 35_1 (step S204).

[0094] The load determination unit 39 compares the duty ratio of the PWM setting instruction signal S3_1 acquired from the PWM command unit 33_1 with a predetermined threshold value of the duty ratio to determine whether or not the duty ratio of the first motor 21_1 is below the threshold value (step S205). If the duty ratio of the first motor 21_1 is not below the threshold value (S205: NO), the load determination unit 39 repeats the processes of S204 and S205.

[0095] When the duty ratio of the first motor 21_1 is below the threshold value (S205: YES), the load determining unit 39 outputs an adjustment signal S9_1 for decreasing the rotation speed of the first motor 21_1 to the PWM command unit 33_1 via the communication processing unit 37_1. The PWM command unit 33_1 changes the duty ratio of the PWM setting instruction signal S3_1 in response to the adjustment signal S9_1 to decrease the rotation speed of the motor 21_1 (step S206). After changing the rotation speed, the load determining unit 39 returns to the process of S201.

[0096] As described above, the load determination unit 39 realized by the first drive control unit 3_1 of the first motor drive control device 111 in the fan system 20 compares the duty ratio of the PWM setting instruction signal S3_2 acquired from the PWM command unit 33_2 with a predetermined threshold value of the duty ratio, and changes the PWM setting instruction signal S3_1 according to the threshold value. In the fan system 20, the rotation speed of the first motor 21_1 on the outlet side is increased or decreased based on the duty ratio indicating the load of the second motor 21_2 on the inlet side. Also, the duty ratio of the PWM setting instruction signal S3_1 acquired from the PWM command unit 33_1 is compared with a predetermined threshold value of the duty ratio, and changes the PWM setting instruction signal S3_1 according to the threshold value. In this way, the first motor drive control device 111 determines the load of the outlet side motor 21_1 in addition to the load of the inlet side motor 21_2, and can change, i.e., increase or decrease, the maximum static pressure without changing the air volume regardless of the rotation speed of the motor 21_1. As with the fan system 1 described above, the fan system 20 according to the second embodiment can obtain a PQ curve characteristic that increases the maximum static pressure P without increasing the maximum air volume Q, as compared with the fan systems of the first and second comparative examples (see FIG. 6). Furthermore, as with the fan system 1, the fan system 20 can increase the maximum static pressure P without increasing the maximum air volume Q, and therefore can reduce the drive current of the motor.

[0097] <<Extension of the embodiment>> The circuit configuration of the motor drive control system and the fan system equipped with the motor drive control system is not limited to the circuit configuration shown in the above embodiment. Various circuit configurations configured to meet the object of the present invention can be applied. The features of the above embodiments may be partially combined to configure a blower and its motor drive control device. In the above embodiment, some components may not be provided, or some components may be configured in a different manner.

[0098] The air blowing system 801 is not limited to the one shown in Fig. 4, and may have four or more fan systems 1. A fan system to which a motor drive control system is applied may have a motor drive control device corresponding to each fan. For example, the air blowing system 801 shown in Fig. 4 has four fan systems 1A, 1B, 1C, and 1D, and therefore a motor drive control system 110 is provided for each of the four fan systems 1A, 1B, 1C, and 1D.

[0099] In the above embodiment, an example has been shown in which only the first fan controls the drive of the first motor based on the results of communication with the second fan, and the second fan controls the drive of the second motor regardless of the results of communication with the first fan, but it is also possible to configure in such a way that only the second fan controls the drive of the second motor based on the results of communication with the first fan, and the first fan controls the drive of the first motor regardless of the results of communication with the second fan.

[0100] The inquiry from the first motor drive control device to the second fan is not necessarily limited to being made periodically, and may be made irregularly, for example. For example, the inquiry interval may change, such that the next inquiry is made at a first interval (e.g., 100 milliseconds) at one time, and the interval until the next inquiry is made may change to a second interval (e.g., 200 milliseconds), a third interval (e.g., 300 milliseconds), and so on.

[0101] The communication method and communication protocol between the first and second fans are not limited to those in the above-described embodiment. Either the first or second fan may be the master in the communication. The first and second fans may be configured to wirelessly communicate with each other. In this case, a communication line may not be provided.

[0102] The first fan and the second fan do not need to be provided with the communication unit 35. For example, the load determination unit 39 of the motor drive control device 111 of the first fan may be configured to receive the drive control signal Sd_2 output by the motor drive circuit 2_2 of the motor drive control device 112 of the second fan via a wired connection.

[0103] The motor driven by the motor drive control device of this embodiment is not limited to a three-phase brushless motor, and may be a motor with another number of phases or another type of motor. The number of Hall elements is not particularly limited. A detector other than the Hall elements may be used to obtain a motor position detection signal. For example, a Hall IC or the like may be used. The motor may also be driven by a sensorless method that does not use a position detector such as a Hall element or a Hall IC.

[0104] The above-mentioned flowcharts and the like are examples for explaining the operation, and are not limited to these. The steps shown in each diagram of the flowchart are specific examples, and are not limited to these flows. For example, the order of each step may be changed, other processes may be inserted between each step, or the processes may be parallelized.

[0105] A part or all of the processing in the above-mentioned embodiment may be performed by software or by using a hardware circuit. For example, the control circuit unit is not limited to a microcomputer. At least a part of the internal configuration of the control circuit unit may be processed by software.

[0106] The above-described embodiments should be considered as illustrative and not restrictive in all respects. The scope of the present invention is defined by the claims, not the above description, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0107] 1, 1A, 1B, 1C, 1D, 10, 20... fan system, 2_1... first motor drive circuit (motor drive circuit), 2_2... second motor drive circuit (motor drive circuit), 3_1... first drive control unit (drive control unit), 3_2... second drive control unit (drive control unit), 11... first blower (blower), 12... second blower (blower), 21_1... first motor (motor), 21_2... second motor (motor), 25, 25_1, 25_2... Hall element, 30_1..., 30_2... motor drive control processing unit, 31_1, 31_2... rotation speed calculation unit, 32_1, 32_ 2...speed command analysis unit, 33_1, 33_2...PWM command unit, 34_1, 34_2...PWM signal generation unit, 35_1, 35_2...communication unit, 36_1, 36_2...transmission / reception unit, 37_1, 37_2...communication processing unit, 39...load determination unit, 45...communication line, 62_1...first impeller (impeller), 62_2...second impeller (impeller), 110...motor drive control system, 111...first motor drive control device (motor drive control device), 112...second motor drive control device (motor drive control device), 800...control device, 801...blower system, 900...electronic device

Claims

1. A motor drive control system including a first motor drive control device and a second motor drive control device provided corresponding to a first motor and a second motor, respectively, The first motor drive control device and the second motor drive control device each include a drive control unit that generates a drive control signal for controlling the drive of each of the first motor and the second motor; a motor drive circuit that drives each of the first motor and the second motor based on the drive control signal; The first drive control unit, which is the drive control unit in the first motor drive control device, a load determination unit that executes a determination of a load of the second motor based on a second drive control signal that is the drive control signal acquired from the second motor drive control device, the first drive control unit changes the rotation speed of the first motor in response to the determination by the load determination unit. Motor drive control system.

2. The load determination unit determining whether or not to change the rotation speed of the first motor based on a value of a duty ratio included in the second drive control signal and a threshold value of the duty ratio included in the second drive control signal; The motor drive control system according to claim 1 .

3. The load determination unit When a value of a duty ratio included in the second drive control signal exceeds a threshold value of the duty ratio included in the second drive control signal, the rotation speed of the first motor is increased; reducing the rotation speed of the first motor when a value of a duty ratio included in the second drive control signal does not exceed a threshold value of the duty ratio included in the second drive control signal; The motor drive control system according to claim 2 .

4. The load determination unit A load of the second motor is determined based on the first drive control signal, which is the drive control signal generated by the first drive control unit, and the second drive control signal. The motor drive control system according to claim 1 .

5. the load determination unit acquires the drive control signal from a second drive control unit which is the drive control unit in the second motor drive control device; The motor drive control system according to claim 1 .

6. the load determination unit acquires the drive control signal from a second motor drive circuit which is the motor drive circuit in the second motor drive control device; The motor drive control system according to claim 1 .

7. In a motor drive control system having a plurality of motors, a motor drive control device provided corresponding to each of the plurality of motors, The motor drive control device includes: a drive control unit that generates a drive control signal for controlling the drive of the motor; a motor drive circuit that drives the motor based on the drive control signal; a communication unit that communicates with another motor drive control device that controls the drive of another motor in the motor drive control system, The drive control unit is a load determination unit that executes a determination of a load of the other motor based on a drive control signal of the other motor acquired from the other motor drive control device; The drive control unit changes the rotation speed of the motor in response to the determination by the load determination unit. Motor drive control device.

8. A motor drive control system according to any one of claims 1 to 6; the first motor and the second motor; an impeller attached to each of the first motor and the second motor and configured to be rotatable by a rotational force of the first motor and the second motor; Fan system.

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