JP2022084449A - Motor drive control device, motor drive control system, fan system, and motor drive control method - Google Patents

Abstract

To suppress a damage of a motor, a circuit component, and the like due to heat generation at the time of a motor reactivation.SOLUTION: A motor drive control device 10 has: a motor control circuit 30 generating a drive control signal Sd for controlling drive of a motor 50; a motor drive circuit 31 driving the motor 50 based on the drive control signal Sd; and a temperature sensor 20. The motor control circuit 30 has: a drive control signal generation part 11 generating the drive control signal Sd based on a drive command Sc; a measurement data generation part 23 generating measurement data 240 including a measured value of a temperature of the temperature sensor 20; and an activation management part 25 setting a rest time T for stopping the drive of the motor 50 before starting reactivation of the motor 50 based on the measured value of the temperature, and controlling the drive control signal generation part 11 to stop the drive of the motor 50 at the rest time T.SELECTED DRAWING: Figure 2

Description

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

In recent years, in a motor drive control system for driving a fan motor applied to an information processing device such as a server, there is a tendency to reduce the number of position sensors such as Hall elements for detecting the rotational position of the rotor of the motor. The reason for reducing the number of position sensors is to reduce the space for arranging the position sensors and reduce the cost of parts.

However, reducing the number of position sensors increases the likelihood that the motor will fail to start.
If the motor fails to start, a process to restart the motor is required. For example, Patent Document 1 and Patent Document 2 disclose a technique for restarting a motor when the start of the motor fails.

Japanese Unexamined Patent Publication No. 2010-74883 Japanese Unexamined Patent Publication No. 2010-21434

If the motor fails to start, there is no problem if the motor can be restarted as soon as possible. However, when the start of the motor fails and the restart of the motor is repeatedly executed in a short cycle, the transistor (for example, FET: Field effect) constituting the coil (winding) of the motor or the inverter circuit for driving the motor is used. Circuit parts such as a transistor) may generate heat and be destroyed. The motor restart technique disclosed in Patent Document 1 and Patent Document 2 described above does not consider heat generation of the motor and circuit components.

The present invention is intended to solve the above-mentioned problems, and an object of the present invention is to suppress damage to a motor, circuit parts, etc. due to heat generation when the motor is restarted.

The motor drive control device according to a typical embodiment of the present invention includes a motor control circuit that generates a drive control signal for controlling the drive of the motor, and a motor drive that drives the motor based on the drive control signal. The motor control circuit includes a drive control signal generation unit that generates the drive control signal based on a drive command, and a temperature sensor that measures the temperature. Based on the measurement data generation unit that generates the measurement data and the measurement value of the temperature included in the measurement data, a rest period for stopping the driving of the motor before starting the restart of the motor is set. At the same time, it is characterized by having a start-up management unit that controls the drive control signal generation unit so as to stop the drive of the motor during the rest period.

According to one aspect of the present invention, it is possible to suppress damage to the motor, circuit parts, and the like due to heat generation when the motor is restarted.

It is a figure which shows an example of the structure of the motor drive control system which concerns on this embodiment. It is a figure which shows an example of the specific configuration of the superordinate device and the motor drive control device in the motor drive control system which concerns on this embodiment. It is a sequence diagram which shows an example of the flow of the process which concerns on the restart of a motor in the motor drive control system which concerns on this embodiment. It is a sequence diagram which shows an example of the flow of the process which concerns on the restart of a motor in the motor drive control system which concerns on this embodiment. It is a flow diagram which shows the flow of the process on the motor drive control device side at the time of restarting a motor. It is a flow diagram which shows the flow of the process on the motor drive control device side at the time of restarting a motor.

1. 1. Outline of Embodiment First, an outline of a typical embodiment of the invention disclosed in the present application will be described. In the following description, as an example, reference numerals on the drawings corresponding to the constituent elements of the invention are described in parentheses.

[1] The motor drive control device (10) according to a typical embodiment of the present invention includes a motor control circuit (30) that generates a drive control signal (Sd) for controlling the drive of the motor (50). The motor drive circuit (31) for driving the motor based on the drive control signal and the temperature sensor (20) for measuring the temperature are provided, and the motor control circuit is said based on the drive command (Sc). The measurement data includes a drive control signal generation unit (11) that generates a drive control signal, a measurement data generation unit (23) that generates measurement data (240) including the measurement value of the temperature by the temperature sensor, and the measurement data. Based on the measured value of the temperature, a rest period (T) for stopping the drive of the motor before starting the restart of the motor is set, and the drive of the motor is stopped during the rest period. It is characterized by having an activation management unit (25) that controls the drive control signal generation unit.

[2] In the motor drive control device according to the above [1], the start control unit may set the rest period so that the higher the measured value of the temperature, the longer the rest period.

[3] In the motor drive control device according to the above [1] or [2], the motor control circuit further includes a communication unit (15) that communicates with the outside, and the activation management unit is the communication unit. Receives a start request (S6, S12, S20) instructing the start of the motor from the outside, and after the lapse of the rest period, controls the drive control signal generation unit to drive the motor. It may be possible to generate the drive control signal.

[4] In the motor drive control device according to the above [3], the activation management unit receives information indicating the length of the rest period set when the communication unit receives the activation request from the outside. The first response (S8, S14, S22) including may be transmitted to the outside via the communication unit.

[5] In the motor drive control device according to the above [4], the start management unit receives a start result acquisition request (S4, S10, S16, S4, S10, S16, in which the communication unit instructs the transmission of the start status of the motor from the outside. When S24) is received, a second response (S5, S11, S17, S25) including information indicating whether or not the motor has been started successfully may be transmitted to the outside via the communication unit. good.

[6] In the motor drive control device according to any one of the above [3] to [5], the start control unit has the rest period when the measured value of the temperature does not exceed the reference value (th1). The length of the rest period is set to the first value (Ti) specified by the activation request, and when the measured value of the temperature exceeds the reference value (th1), the length of the rest period is set to the first value (Ti). It may be set to a second value (Ts, Ts1 to Ts3) larger than the value of 1.

[7] In the motor drive control device according to any one of [3] to [6] above, the start management unit determines whether or not the motor can be restarted, and the motor cannot be restarted. If it is determined that it is possible, the information (S25) requesting the cancellation of the restart may be transmitted to the outside via the communication unit.

[8] The motor drive control system (2) according to a typical embodiment of the present invention includes the motor drive control device (10) according to any one of the above [3] to [7] and the motor drive control. It comprises a higher-level device (4) that communicates with the device, and the higher-level device is characterized in that the drive command (Sc) and the start request are transmitted to the motor drive control device.

[9] The fan system (1) according to a typical embodiment of the present invention is based on the motor drive control system (2), the motor (50), and the rotational force of the motor according to the above [8]. It is characterized by including an impeller (51) configured to be rotatable.

[10] The motor drive control method according to a typical embodiment of the present invention includes a motor control circuit (30) that generates a drive control signal (Sd) for controlling the drive of the motor (50), and the drive. This is a motor drive control method using a motor drive control device (10) including a motor drive circuit (31) for driving the motor based on a control signal, a temperature sensor (20) for measuring the temperature, and a motor drive control device (10). In the present motor drive control method, the first step (S53) in which the motor control circuit generates the drive control signal based on the drive command, and the measurement in which the motor control circuit includes the measured value of the temperature by the temperature sensor. The second step (S61) for acquiring data and the motor control circuit stop driving the motor before starting the restart of the motor based on the measured value of the temperature included in the measurement data. The first step includes the third step (S63, S64) for setting a rest period for the motor control circuit to stop driving the motor during the rest period set in the third step. It is characterized by including a step (S66) of controlling the generation of the drive control signal so as to be caused.

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

<< Embodiment >>
FIG. 1 is a diagram showing an example of a configuration of a motor drive control system according to the present embodiment.
The motor drive control system 2 shown in FIG. 1 includes one higher-level device (an external example) 4 which is a control device and one or more motor drive control devices 10, and the higher-level device 4 is each motor drive control device 10. Is a system that drives the motor 50 connected to each motor drive control device 10 by controlling the motor 50.

The motor drive control system 2 is used in, for example, an electric device, and constitutes a fan system 1 in which the operation of a plurality of fans is controlled by one control device and air is blown to each of the plurality of cooling targets. It is assumed that the fan system 1 according to the present embodiment is arranged in a closed space in the server, for example, and constitutes a cooling system for cooling various electronic components and the like constituting the server.

The fan system 1 is, for example, various types for driving four fan devices 3a to 3d provided corresponding to the four cooling targets A, B, C, and D, and motors 50 in each fan device 3a to 3d. It is provided with a higher-level device (an example of a control device) 4 that transmits a command to each fan device 3a to 3d.

In the following description, when the fan devices 3a to 3d are not distinguished, they are also referred to as "fan device 3". In the present embodiment, the case where the fan system 1 has four fan devices 3a to 3d will be described as an example, but the fan system 1 may have one or more fan devices 3, and the number thereof may be one or more. Is not restricted. Further, in FIG. 1, a case where the communication line connecting the host device 4 and each fan device 3 is wired is exemplified, but the communication between the fan devices 3a to 3d and the host device 4 is wireless communication. May be.

The host device 4 is a control device that controls the drive of each fan device 3. For example, when the fan system 1 constitutes a cooling system for a server, the host device 4 is a program processing device for realizing a main function as a server.

For example, the host device 4 includes a processor such as a CPU, various storage devices such as RAM and ROM, a counter (timer), an A / D conversion circuit, a D / A conversion circuit, a clock generation circuit, and an input / output I / F. It is realized by housing a program processing device (for example, a microcontroller) having a configuration in which peripheral circuits such as circuits are connected to each other via a bus or a dedicated line in one housing together with a fan device 3. There is.

The host device 4 is, for example, a change in the environment of the fan system 1 (change in processing load, change in temperature inside the server, etc.) or the status of the fan device to be controlled (change in the number of fan devices to be controlled, some fan devices). Each fan device 3 is controlled so that the air volume of the fan (motor) becomes appropriate according to (such as failure).

Each fan device 3 includes a motor 50, an impeller 51, and a motor drive control device 10 that controls the drive of the motor 50 in response to a command from the host device 4.

The motor 50 is, for example, a three-phase brushless motor. The type of the motor 50 is not particularly limited, and the number of phases is not limited to three.

The impeller (impeller) 51 is a component that generates wind, and is configured to be rotatable by the rotational force of the motor 50. For example, the rotation shaft of the impeller 51 is coaxially connected to the output shaft of the motor 50. In the present embodiment, for example, it is assumed that the impeller 51 and the motor 50 constitute one fan (fan motor) 5.

FIG. 2 is a diagram showing an example of a specific configuration of the host device 4 and the motor drive control device 10 in the motor drive control system 2 according to the present embodiment.

As shown in FIG. 2, the host device 4 includes, for example, a data processing control unit 41 for realizing a main function as a server, and a communication unit 42 for communicating with each fan device 3.

Communication between the host device 4 (communication unit 42) and each fan device 3 (motor drive control device 10) is realized by, for example, serial communication.

In the data processing control unit 41 and the communication unit 42, for example, in the program processing device constituting the host device 4, the processor executes various arithmetic processes according to the program stored in the memory, and the counter, the A / D conversion circuit, and the like are used. It is realized by controlling the peripheral circuit of.

The data processing control unit 41 outputs a start request instructing each fan device 3 to start the motor 50 (fan device 3). For example, when the power of the server as the host device 4 is turned on or when the server is restarted, the data processing control unit 41 sends a start start request for instructing the start of the motor 50 (fan) as a start request. It is transmitted to each fan device 3 via the communication unit 42.

Further, when the start of the motor 50 fails in the fan device 3, the data processing control unit 41 sends a restart request instructing the restart of the motor 50 (fan) as a start request via the communication unit 42. The data is transmitted to the fan device 3 in which the start of the motor 50 fails.

At this time, the restart request is information that specifies the length of the rest period T for stopping the driving of the motor 50 before starting the restart of the motor 50 (hereinafter, also referred to as “designated time Ti”). May be included. The details of the rest period T will be described later.

Further, the data processing control unit 41 instructs each fan device 3 of a target value for driving the motor 50 in order to adjust the air volume supplied from each fan device 3 arranged in the server, for example. The drive command signal Sc is output. For example, the data processing control unit 41 uses a speed command signal for designating a target rotation speed (target rotation speed) of the motor 50 of each fan device 3 as a drive command signal Sc via the communication unit 42 of each fan device 3. Send to.

The transmission / reception of the drive command signal Sc may be realized by using, for example, a dedicated line connecting the host device 4 and each fan device 3 instead of the serial communication described above. In this case, the speed command signal as the drive command signal Sc may be, for example, a PWM signal having a duty ratio corresponding to the target rotation speed. Further, the drive command signal Sc is not limited to the speed command signal described above, and may be, for example, a torque command signal indicating a target value of the torque of the motor 50.

The data processing control unit 41 transmits a rotation speed signal So (for example, an FG (freaky generator) signal) representing the actual rotation speed (rotation speed) of the motor 50 output from each fan device 3 via the communication unit 42. By receiving, the rotation state of the motor 50 of each fan device 3 is monitored. The transmission / reception of the rotation speed signal So may be realized, for example, by using a dedicated line connecting the host device 4 and each fan device 3, or by the serial communication described above.

The data processing control unit 41 transmits information regarding the operation of the motor 50, such as whether or not the motor 50 can be started, the drive current and temperature of the motor 50, the cumulative operating time of the motor 50, and the presence or absence of an abnormality. Requests are made to each fan device 3 via 42, and information transmitted from each fan device 3 is received via the communication unit 42 in response to the request. Thereby, the host device 4 can know the driving state of the motor 50 in each fan device 3 in more detail.

For example, the data processing control unit 41 sends a restart request for the motor 50 to the fan device 3, and then sends a first response including information indicating whether or not the restart of the motor 50 is possible to the fan. Received from the device 3 via the communication unit 42. Here, the first response may include information indicating the length of the required rest period T.

Further, the data processing control unit 41 sends a start result acquisition request instructing transmission of the start status of the motor 50 to the fan device 3 that has sent the start request in order for the host device 4 to acquire the start status of the motor 50. And send. Then, the data processing control unit 41 receives a second response including information indicating whether or not the motor 50 has been successfully started from the fan device 3 that has received the start result acquisition request via the communication unit 42.

The motor drive control device 10 has, as main functions, a motor drive control function for controlling the rotation of the motor, a communication function for communicating with the host device 4, and a restart management function for managing the restart of the motor 50. It is equipped with.

As a motor drive control function, the motor drive control device 10 generates a drive control signal Sd in response to a drive command (speed command signal) Sc from the host device 4, and coils of each phase (for example, three phases) of the motor 50. A sinusoidal drive current is periodically passed through the motor 50 to rotate the motor 50.

As a communication function, the motor drive control device 10 receives various commands from the host device 4 by transmitting / receiving data to / from the host device 4 (for example, by serial communication), and responds to the received commands, etc. Is transmitted to the host device 4.

As a restart management function, the motor drive control device 10 manages the execution of restart of the motor 50 when the start of the motor 50 fails.
As described above, when the motor is repeatedly restarted, circuit parts such as the coil of the motor and the transistors constituting the inverter circuit may generate heat and be destroyed. Therefore, the motor drive control device 10 according to the present embodiment measures the temperature around the motor 50 when the motor 50 is restarted in response to the start command from the host device 4, and the motor is based on the measurement result of the temperature. It has a restart management function that sets a rest period T of 50 and restarts the motor 50 after the rest period T has elapsed.

Here, the rest period T is a period for stopping the driving of the motor 50 before starting the restart of the motor 50. In other words, the rest period T is the waiting time until the motor 50 is restarted. The length of the rest period T is set to a sufficient time for dissipating heat from the generated motor 50, circuit parts, and the like.
In the present embodiment, as an example, "stopping the drive" means performing a lock protection operation by lock energization control, and "rest period" means a stop period due to the lock protection operation. ..

Hereinafter, the configuration of the motor drive control device 10 for realizing each of the above-mentioned functions will be described in detail.

As shown in FIG. 2, the motor drive control device 10 includes, for example, a motor control circuit 30, a motor drive circuit 31, a temperature sensor 20, and a position sensor 21 as functional units for realizing each of the above-mentioned functions. There is. The motor control circuit 30 includes a drive control signal generation unit 11, a communication unit 15, a rotation speed measurement unit 22, a measurement data generation unit 23, a measurement data storage unit 24, a start management unit 25, a rest period storage unit 26, and an FG signal generation. It has a part 27.

Here, among the functional units constituting the motor control circuit 30, the drive control signal generation unit 11, the rotation speed measurement unit 22, the measurement data generation unit 23, the measurement data storage unit 24, the activation management unit 25, and the rest period storage unit 26 is realized by, for example, a program processing apparatus. More specifically, a processor such as a CPU, various storage devices such as RAM and ROM, a counter (timer), an A / D conversion circuit, a D / A conversion circuit, a clock generation circuit, and an input / output I / F circuit. In a program processing device (for example, a microcontroller) having a configuration in which peripheral circuits such as the above are connected to each other via a bus or a dedicated line, the CPU executes various arithmetic processes according to a program stored in a memory, and the processing thereof. By controlling peripheral circuits such as an A / D conversion circuit and an input / output interface circuit based on the result, the above-mentioned functional block is realized.

The motor drive control device 10 may have a configuration in which the motor drive circuit 31 and at least a part of other functional units are packaged as one integrated circuit device (IC), or the motor drive circuit 31 and the motor drive control device 10. Other functional units may be packaged as individual integrated circuit devices.

Hereinafter, each functional unit constituting the motor drive control device 10 will be described in detail.

The drive control signal generation unit 11 is a functional unit for generating a drive control signal Sd for controlling the drive of the motor 50. For example, when the drive control signal generation unit 11 receives the drive command signal (speed command signal) Sc output as a drive command from the host device 4, the rotation speed of the motor 50 is the target specified by the drive command signal Sc. The drive control signal Sd is generated so as to match the rotation speed.

The drive control signal Sd is, for example, a PWM (Pulse Width Modulation) signal.

As shown in FIG. 2, the drive control signal generation unit 11 includes, for example, a speed command analysis unit 12, a duty ratio determination unit 13, and an energization control unit 14.

The speed command analysis unit 12 receives the drive command signal (speed command signal) Sc output from the host device 4, and analyzes the target rotation speed specified by the drive command signal Sc. For example, when the drive command signal Sc is a PWM signal having a duty ratio corresponding to the target rotation speed, the speed command analysis unit 12 analyzes the duty ratio of the drive command signal Sc and has a rotation speed corresponding to the duty ratio. Information is output as the target rotation speed.

The duty ratio determination unit 13 includes a target rotation speed output from the speed command analysis unit 12, a measured value of the rotation speed of the motor 50 measured by the rotation speed measurement unit 22 described later, and a control signal from the start management unit 25. Based on the above, the duty ratio of the PWM signal as the drive control signal Sd is determined.

Specifically, the duty ratio determining unit 13 calculates the control amount of the motor 50 so that the difference between the target rotation speed and the measured value of the rotation speed of the motor 50 becomes small, and the PWM signal according to the control amount is calculated. Determine the duty ratio.

When a control signal (lock protection control signal) instructing the stop of driving of the motor 50 is input from the start management unit 25, the duty ratio determination unit 13 is irrespective of the drive command signal Sc (target rotation speed). The duty ratio of the PWM signal (for example, duty ratio = 0%) is determined so as to stop the driving of the motor 50.

The energization control unit 14 generates a PMW signal having a duty ratio determined by the duty ratio determination unit 13 and outputs it as a drive control signal Sd. Further, the energization control unit 14 outputs a drive control signal Sd for stopping the operation of the motor drive circuit 31 when the signal input from the duty ratio determination unit 13 is the duty ratio for stopping the drive of the motor 50.

The motor drive circuit 31 drives the motor 50 based on the drive control signal Sd generated by the drive control signal generation unit 11. The motor drive circuit 31 has, for example, an inverter circuit and a predrive circuit (not shown).

The inverter circuit outputs a drive signal to the motor 50 based on the output signal output from the predrive circuit, and energizes the coil included in the motor 50. The inverter circuit is configured, for example, by arranging a pair of a series circuit of two switch elements (for example, transistors such as FETs) provided at both ends of a DC power supply for each phase coil. In each pair of the two switch elements, the terminals of each phase of the motor 50 are connected to the connection points between the switch elements.

The predrive circuit generates an output signal for driving the inverter circuit based on the drive control signal Sd, and outputs the output signal to the inverter circuit. The predrive circuit generates and outputs a drive signal for driving each switch element of the inverter circuit, for example, based on the drive control signal Sd. When this drive signal turns on / off each switch element constituting the inverter circuit, electric power is supplied to each phase of the motor 50 and the rotor of the motor 50 rotates.

The temperature sensor 20 is a device that measures the temperature inside the fan device 3. The temperature sensor 20 is, for example, a thermistor. The temperature sensor specifically detects the temperature around the motor 50. For example, the temperature sensor 20 is arranged at a predetermined position in the fan device 3 so that the temperature of the coil of the motor 50 and the temperature of each transistor constituting the inverter circuit of the motor drive circuit 19 can be appropriately measured. Further, the temperature sensor 20 may be configured to be built in the motor control circuit 30. The number of temperature sensors 20 provided in the motor drive control device 10 is not particularly limited, and may be one or a plurality of temperature sensors 20 may be provided for each measurement target.

The position sensor 21 is a device that detects the rotational position of the rotor of the motor 50. The position sensor 21 is a Hall element. The Hall element as the position sensor 21 detects the magnetic poles of the rotor and outputs a Hall signal whose voltage changes according to the rotation of the rotor.

The position sensor 21 is not limited to the Hall element. The position sensor 21 may be any device that can detect the rotational position of the rotor of the motor, and may be, for example, an encoder or the like. In this case, the position sensor 21 may be provided outside the motor drive control device 10 as a device independent of the motor drive control device 10 rather than as one of the components of the motor drive control device 10. .. The same applies to the temperature sensor 20 described above.

Further, in the motor drive control device 10, in addition to the temperature sensor 20 and the position sensor 21 described above, a current detector (for example, shunt resistance) that detects the current flowing through the coil of the motor 50 and vibration that detects the vibration of the motor 50. It may have various sensors such as sensors.

The rotation speed measuring unit 22 is a functional unit that measures the rotation speed of the motor 50. The rotation speed measuring unit 22 measures the rotation speed of the motor 50 based on the detection signal (Hall signal) of the Hall element as the position sensor 21, and outputs the measurement result.

The FG (Frequency Generator) signal generation unit 27 generates an FG signal as a rotation speed signal So indicating the rotation speed of the motor 50. The FG signal generation unit 27 produces a signal (FG signal) having a period (frequency) proportional to the rotation speed of the motor 50, based on, for example, a detection signal (Hall signal) output from the Hall element as the position sensor 21. Generate. The FG signal output from the FG signal generation unit 27 is input to the host device 4 as a rotation speed signal So. The FG signal generation unit 27 may be realized by, for example, an FG pattern formed on a substrate (printed circuit board) on which the motor 50 is mounted.

The communication unit 15 is a functional unit for communicating with the outside. Specifically, the communication unit 15 transmits / receives data to / from the host device 4 as a control device. The communication unit 15 includes, for example, a transmission unit 16, a reception unit 17, and a communication control unit 18.

The transmission unit 16 transmits a signal to the outside (for example, an external device such as the host device 4). The receiving unit 17 receives a signal from the outside (for example, an external device such as the host device 4). The transmission unit 16 and the reception unit 17 are, for example, serial communication interface circuits controlled by the communication control unit 18 to generate a predetermined serial signal, transmit it to the communication line, and receive the serial signal from the communication line.

The communication control unit 18 sends the encoded data to the transmission unit 16 and decodes the data from the reception unit 17 to realize transmission / reception of data to / from the host device 4. The communication control unit 18 is realized, for example, by program processing by a processor constituting the motor drive control device 10 described above.

The communication control unit 18 gives a request command from the host device 4 received via the reception unit 17 to the activation management unit 25, and also gives a response to the request command given from the activation management unit 25 via the transmission unit 16. Is transmitted to the communication unit 42 of the host device 4.

For example, when the receiving unit 17 receives the activation request of the motor 50 transmitted from the host device 4, the communication control unit 18 gives the activation request to the activation management unit 25 and is given by the activation management unit 25. The first response to the activation request is transmitted to the communication unit 42 of the host device 4 via the transmission unit 16.

Further, when the receiving unit 17 receives the activation result acquisition request instructing the transmission of the activation status of the motor 50 (whether or not the activation of the motor 50 is successful) transmitted from the host device 4, the communication control unit 18 receives. , The activation result acquisition request is given to the activation management unit 25, and the second response to the activation result acquisition request given by the activation management unit 25 is transmitted to the communication unit 42 of the host device 4 via the transmission unit 16. ..

The measurement data generation unit 23 is a functional unit for generating measurement data 240 related to the operation of the motor 50. For example, the measurement data generation unit 23 calculates a temperature measurement value (digital value) based on an electric signal output from the temperature sensor 20, and stores the measurement value as measurement data 240 in the measurement data storage unit 24. ..

For example, the measurement data generation unit 23 stores the temperature measurement result by the temperature sensor 20 as the measurement data 240 in the measurement data storage unit 24 every unit time. Further, the measurement data generation unit 23 stores, for example, the rotation speed (rotational speed) of the motor 50 measured by the rotation speed measurement unit 22 as measurement data 240 in the measurement data storage unit 24.

Further, the measurement data generation unit 23 also has measurement data 240, for example, information on the duty ratio determined by the duty ratio determination unit 13 and information such as the rising timing of the PWM signal as the drive control signal Sd output from the energization control unit 14. It may be stored in the measurement data storage unit 24.

When the above-mentioned current sensor or vibration sensor is provided in addition to the temperature sensor 20, the measurement data generation unit 23 may, for example, detect the drive current of the motor 50 by the current sensor every unit time. May be stored in the measurement data storage unit 24 as the measurement data 240, or the magnitude of the vibration is calculated based on the detection signal from the vibration sensor every unit time and stored in the measurement data storage unit 24 as the measurement data 240. You may remember it.

The measurement data 240 may be acquired by the measurement data generation unit 23 in response to a command from the host device 4.

The start management unit 25 is a functional unit that manages the execution of the start of the motor 50. The start management unit 25 sets the rest period T based on the measured value of the temperature included in the measurement data 240, and controls the drive control signal generation unit 11 so as to stop the driving of the motor 50 in the rest period T. ..

Specifically, the start management unit 25 controls the drive so that the drive of the motor 50 is stopped during the rest period T when the communication unit 15 receives a start request (restart request) instructing the start of the motor 50. The signal generation unit 11 is controlled, and after the rest period T elapses, the drive control signal generation unit 11 is controlled to enable the generation of the drive control signal Sd for driving the motor 50.

The activation management unit 25 sets the rest period T so that the higher the measured value of the temperature, the longer the rest period T. Specifically, the activation management unit 25 sets the length of the rest period T to the first value when the measured value of the temperature does not exceed the predetermined reference value, and the measured value of the temperature is the predetermined reference value. If it exceeds, the length of the rest period T is set to the second value Ts, which is larger than the first value.

Here, the first value is, for example, the designated time Ti specified by the start request (restart request) from the host device 4 received by the communication unit 15. The second value Ts is, for example, a time calculated according to the measured temperature.

More specifically, the start control unit 25 has a designated time (first value) specified by a start request (restart request) from the host device 4 when the measured temperature value does not exceed the reference value. Ti is set as the length of the rest period T. On the other hand, when the measured value of the temperature exceeds the reference value, the second value Ts is calculated according to the measured value of the temperature, and the second value Ts is set as the length of the rest period T.

For example, a plurality of threshold values (reference values) relating to the above-mentioned temperature are stored in advance in a storage device in the motor drive control device 10, and the activation management unit 25 sets the stored threshold values and the measured temperature value t. The second value Ts may be determined based on the comparison result.

In the present embodiment, as an example, consider the case where three threshold values (reference values) th1, th2, th3 (th1 <th2 <th3) related to temperature are set.
For example, when the measured temperature value t <th1, as described above, the activation management unit 25 sets the designated time Ti (for example, 1 second) designated by the host device 4 as the first value for the rest period. Set as the length of T (T = Ti = 1 second).

On the other hand, when the measured temperature value t is equal to or greater than the threshold value th1, the activation management unit 25 sets the second value Ts as the length of the rest period T.
For example, when th1 ≦ t <th2, the activation management unit 25 sets a second value Ts1 (for example, 10 seconds) as the length of the rest period T (T = Ts1 = 10 seconds). When th2 ≦ t <th3, the activation management unit 25 sets the second value Ts2 (for example, 15 seconds) as the length of the rest period T (T = Ts2 = 15 seconds). When th3 ≦ t <th4, the activation management unit 25 sets the second value Ts3 (for example, 20 seconds) as the length of the rest period T (T = Ts3 = 20 seconds).

In this way, the start-up management unit 25 determines the length of the rest period T for restarting the motor 50 according to the measured value of the temperature. The information indicating the relationship between the temperature range determined by the above-mentioned threshold values (reference values) th1, th2, and th3 and the second value Ts corresponding to each temperature range is, for example, a correspondence relationship table in advance of the motor drive control device 10. It may be stored in the internal storage device.

Further, the method of calculating the second value Ts is not limited to the method using the above-mentioned threshold value. For example, a function indicating the relationship between the temperature and the second value Ts as the rest period is stored in advance in the storage device in the motor drive control device 10, and the start-up management unit 25 uses the stored function. Then, the second value Ts may be calculated from the measured value of the temperature. Here, the above function is set so that the second value Ts increases as the temperature rises.

When the rest period T is set, the start management unit 25 controls the drive control signal generation unit 11 so as to stop the drive of the motor 50 in the rest period T. For example, the start-up management unit 25 sets a value corresponding to the rest period T in a counter (not shown), starts timing, and indicates a control signal (instructing to stop driving the motor 50 until the rest period T elapses). The lock protection instruction signal) is output to the duty ratio determination unit 13. After the rest period T due to the lock protection operation elapses, the start management unit 25 stops the control signal (lock protection instruction signal) instructing the stop of the drive of the motor 50, so that the drive command signal by the drive control signal generation unit 11 is stopped. It enables the generation of the drive control signal Sd based on Sc.

Further, the start management unit 25 determines whether or not the start of the motor 50 is successful. For example, the start management unit 25 determines whether or not the start of the motor 50 is successful by monitoring the measured value of the rotation speed included in the measurement data 240.

Further, the start management unit 25 determines whether or not the motor 50 can be restarted when a restart command is input from the outside (upper device 4). For example, the start management unit 25 counts the number of times the motor 50 has failed to restart (hereinafter, also referred to as “start failure number”), and if the count value does not exceed the threshold value, the motor 50 is restarted. Is possible, and if the count value exceeds the threshold value, it is determined that the motor 50 cannot be restarted. When the start management unit 25 determines that the motor 50 cannot be restarted, the start management unit 25 cancels the restart of the motor 50. For example, a control signal (lock protection instruction signal) instructing the stop of driving of the motor 50 is output to the duty ratio determination unit 13.

The number of startup failures is, for example, the number of times that the restart of the motor 50 fails continuously, and when the motor 50 is successfully started, the value of the number of startup failures may be reset.

The start management unit 25 communicates with the outside (upper device 4) via the communication unit 15 regarding the start of the motor 50. Specifically, when the communication unit 15 receives the activation request (restart request), the activation management unit 25 provides information (Ti, Ts1, Ts2, etc.) indicating the length of the rest period T set by the above method. The first response including the above is transmitted to the outside (upper device 4) via the communication unit 15.

At this time, the first response to the restart request may include information indicating whether or not the motor 50 can be restarted. For example, when the motor 50 can be restarted, the start management unit 25 has information indicating that the motor 50 can be restarted and information indicating the length of the rest period T (Ti, Ts1, Ts2). Etc.) and may be transmitted. On the other hand, when the motor 50 cannot be restarted, the start management unit 25 may, for example, provide information indicating that the motor 50 cannot be restarted (for example, canceling the restart of the motor 50 described later). The first response including the information requesting) may be transmitted.

Further, when the communication unit 15 receives the activation result acquisition request, the activation management unit 25 sends a second response including information indicating whether or not the motor 50 has been successfully activated to the outside (upper level) via the communication unit 15. Send to device). For example, the start management unit 25 determines that the motor 50 cannot be restarted when the start of the motor 50 fails and the number of start failures exceeds the threshold value. In this case, the second response to the start result acquisition request may include, in addition to the information indicating that the start of the motor 50 has failed, the information requesting the stop of the restart of the motor 50 to be transmitted.

The rest period storage unit 26 is a functional unit for storing data related to the rest period T. The rest period storage unit 26 contains, for example, information on the designated time (first value) Ti designated by the host device 4, information on the second values Ts1, Ts2, etc. calculated by the activation management unit 25, and the activation management unit. Information such as the rest period T set by 25 is stored. Further, the rest period storage unit 26 stores information on the number of times the restart of the motor 50 has failed.

The rest period storage unit 26 may store information such as the above function for the activation management unit 25 to calculate the second value Ts and predetermined reference values th1, th2, th3 and the like.

Hereinafter, a specific processing flow regarding the restart management function of the motor drive control device 10 will be described.

3A and 3B are sequence diagrams showing an example of a flow of processing related to restarting the motor 50 in the motor drive control system 2 according to the present embodiment.
3A and 3B show an example of communication between the fan device 3 (motor drive control device 10) of the plurality of fan devices 3 and the host device 4.

For example, the initial state is a state in which the server as the higher-level device 4 is started and the data processing control unit 41 in the higher-level device 4 and the motor drive control device 10 of the fan device 3 can communicate with each other.

In the initial state, first, the data processing control unit 41 of the host device 4 sends a start start request instructing the start of the motor 50 (fan) to the motor drive control device 10 of the fan device 3 via the communication unit 42. Transmit (step S1).

Upon receiving the start start request, the motor drive control device 10 transmits a first response including information indicating that the motor 50 can be started to the host device 4 by the start management unit 25 (step S2).

Next, the motor drive control device 10 of each fan device 3 activates the motor 50 (step S3). For example, the activation management unit 25 controls the drive control signal generation unit 11 (duty ratio determination unit 13) to enable the generation of the drive control signal Sd based on the drive command signal Sc.

In the examples of FIGS. 3A and 3B, it is assumed that the start of the motor 50 fails and the measured temperature value does not exceed the reference value (threshold value) th1 at the time of step S3. At this time, the motor drive control device 10 stores the number of times the motor 50 fails to start as "1". Further, the motor drive control device 10 determines that the problem of heat generation does not occur because the measured temperature value does not exceed the reference value th1.

Next, the data processing control unit 41 of the host device 4 transmits a start result acquisition request for the motor 50 (fan) to the motor drive control device 10 via the communication unit 42 (step S4).

Upon receiving the start result acquisition request, the motor drive control device 10 transmits a second response including information indicating that the start of the motor 50 has failed to the host device 4 by the start management unit 25 (step S5). At this time, the motor drive control device 10 may transmit information indicating that the problem of heat generation has not occurred in addition to the second response.

Next, the data processing control unit 41 of the host device 4 transmits a restart request instructing the restart of the motor 50 to the motor drive control device 10 of the fan device 3 via the communication unit 42 (step S6). At this time, the data processing control unit 41 includes the designated time Ti (for example, 1 second) for designating the rest period T of the motor 50 for restart in the restart request and transmits the data.

Upon receiving the restart request, the motor drive control device 10 determines whether or not the motor 50 can be restarted, and sets the rest period T required for restarting the motor 50 (step S7).

In the examples of FIGS. 3A and 3B, at the time of step S7, the number of failure of starting the motor 50 does not exceed the threshold value (for example, 8 times), the restart of the motor 50 can be executed, and the temperature. It is assumed that the measured value t of the above does not exceed the reference value th1. In this case, the motor drive control device 10 sets the designated time Ti (for example, 1 second) designated by the host device 4 in step S6 as the rest period T (T = Ti).

Next, the motor drive control device 10 transmits a first response including information indicating that the motor can be restarted and information on the rest period T = Ti (= 1 second) to the host device 4. (Step S8).

Next, the motor drive control device 10 restarts the motor 50 after the rest period T (= Ti = 1 second) has elapsed (step S9). For example, the activation management unit 25 controls the drive control signal generation unit 11 (duty ratio determination unit 13), and the drive control signal Sd based on the drive command signal Sc until the rest period T (= Ti = 1 second) elapses. Is stopped, the drive control signal Sd based on the lock protection control signal is generated to perform the lock protection operation, the lock protection operation is released after the rest period T elapses, and the drive control signal based on the drive command signal Sc is released. Allows the generation of Sd.

In the examples of FIGS. 3A and 3B, it is assumed that the restart of the motor 50 fails and the measured temperature value does not exceed the predetermined reference value th1 at the time of step S9. At this time, the motor drive control device 10 stores the number of times the motor 50 fails to start as “2”. Further, the motor drive control device 10 determines that the problem of heat generation does not occur because the measured temperature value does not exceed the reference value th1.

Next, the data processing control unit 41 of the host device 4 transmits a start result acquisition request for the motor 50 (fan) to the motor drive control device 10 via the communication unit 42 (step S10).

The motor drive control device 10 that has received the start result acquisition request in step S10 transmits a second response including information indicating that the start of the motor 50 has failed to the host device 4 by the start management unit 25 (step). S11). At this time, the motor drive control device 10 may transmit information indicating that the problem of heat generation has not occurred in addition to the second response.

After that, consider a case where the start of the motor 50 fails continuously and the restart process from steps S6 to S11 is performed a plurality of times, so that the measured temperature value exceeds the reference value th1 and the problem of heat generation occurs. ..

In this case, first, the data processing control unit 41 of the host device 4 issues a restart request for instructing the restart of the motor 50 together with the designated time Ti (for example, 1 second) as in step S6. It is transmitted to 10 (step S12).

Upon receiving the restart request, the motor drive control device 10 determines whether or not the motor 50 can be restarted, and sets the rest period T required for restarting the motor 50 (step S13).

In the examples of FIGS. 3A and 3B, at the time of step S13, the number of failure of starting the motor 50 does not exceed the threshold value (for example, 8 times), the motor 50 can be restarted, and the measured temperature value. It is assumed that t is in the range of th1 ≦ t <th2. In this case, the motor drive control device 10 sets the length of the rest period T to the first value Ts1 (for example, 10 seconds) (T = Ts1).

Next, the motor drive control device 10 transmits a first response including information indicating that the motor can be restarted and information on the rest period T = Ts1 (= 10 seconds) to the host device 4. (Step S14).

Next, the motor drive control device 10 restarts the motor 50 after the rest period T (= Ts1 = 10 seconds) has elapsed (step S15). For example, the activation management unit 25 controls the drive control signal generation unit 11 (duty ratio determination unit 13), and the drive control signal Sd based on the drive command signal Sc until the rest period T (= Ts1 = 10 seconds) elapses. Is stopped, the drive control signal Sd based on the lock protection control signal is generated to perform the lock protection operation, the lock protection operation is released after the rest period T elapses, and the drive control signal based on the drive command signal Sc is released. Allows the generation of Sd.

In the examples of FIGS. 3A and 3B, it is assumed that the restart of the motor 50 fails and the measured temperature value exceeds the reference value th1 at the time of step S15. At this time, the motor drive control device 10 stores the number of times the motor 50 fails to start as, for example, “8”. Further, the motor drive control device 10 determines that the problem of heat generation has occurred because the measured value of the temperature exceeds the predetermined reference value th1.

Next, the data processing control unit 41 of the host device 4 transmits a start result acquisition request for the motor 50 (fan) to the motor drive control device 10 via the communication unit 42 (step S16).

Upon receiving the start result acquisition request in step S16, the motor drive control device 10 transmits a second response including information indicating that the start of the motor 50 has failed to the host device 4 (step S17). At this time, the motor drive control device 10 may transmit information indicating that the problem of heat generation has occurred in addition to the second response.

After that, as shown in FIG. 3B, the host device 4 transmits a restart request instructing the restart of the motor 50 to the motor drive control device 10 together with the designated time Ti (for example, 1 second), as in step S6. (Step S20).

Upon receiving the restart request, the motor drive control device 10 determines whether or not the motor 50 can be restarted, and sets the rest period T required for restarting the motor 50 (step S21).

In FIGS. 3A and 3B, at the time of step S21, the number of failure of starting the motor 50 (= 8 times) does not exceed the threshold value, the motor 50 can be restarted, and the measured temperature value t is It is assumed that the range is in the range of th2 ≦ t <th3. In this case, the motor drive control device 10 sets the length of the rest period T to the second value Ts2 (for example, 15 seconds) (T = Ts2).

Next, the motor drive control device 10 transmits a first response including information indicating that the motor can be restarted and information on the rest period T = Ts2 (= 15 seconds) to the host device 4. (Step S22).

Next, the motor drive control device 10 restarts the motor 50 after the rest period T (= Ts2 = 15 seconds) has elapsed (step S23). For example, the activation management unit 25 controls the drive control signal generation unit 11 (duty ratio determination unit 13), and the drive control signal Sd based on the drive command signal Sc until the rest period T (= Ts2 = 15 seconds) elapses. Is stopped, the drive control signal Sd based on the lock protection control signal is generated to perform the lock protection operation, the lock protection operation is released after the rest period T (15 seconds) has elapsed, and the drive command signal Sc is used. It enables the generation of the drive control signal Sd based on the drive control signal Sd.

In the examples of FIGS. 3A and 3B, it is assumed that the restart of the motor 50 fails in step S23, and the number of restart failures becomes "9 times". At this time, the motor drive control device 10 determines that the motor 50 cannot be restarted because the number of times the motor 50 has failed to start exceeds the threshold value (8 times).
Further, since the measured temperature value exceeds the predetermined reference value th2 (> th1), the start-up management unit 25 determines that the problem of heat generation has occurred.

Next, after the rest period T (= Ts2 = 15 seconds) elapses, the data processing control unit 41 of the host device 4 requests the motor 50 (fan) to acquire the start result via the communication unit 42. It is transmitted to 10 (step S24).

Upon receiving the start result acquisition request in step S24, the motor drive control device 10 receives a second response including information requesting the stop of the restart of the motor 50 in addition to the information indicating that the start of the motor 50 has failed. It is transmitted to the host device 4 (step S25). At this time, the motor drive control device 10 may transmit information indicating that the problem of heat generation has occurred in addition to the second response.

Upon receiving the second response including the information requesting the stop of the restart of the motor 50 in step S25, the host device 4 stops transmitting the restart request of the motor 50 for a certain period of time (step S26). ..

Next, the processing procedure on the motor drive control device 10 side in the restart processing according to the present embodiment will be described.

4A and 4B are flow charts showing a flow of processing on the motor drive control device side when the motor is restarted.
For example, when the server as the host device 4 is started and power is supplied to the fan device 3, the motor drive control device 10 is started. After starting, the motor drive control device 10 determines whether or not a start start request from the host device 4 has been received (step S51). If the start start request has not been received (step S51: NO), the motor drive control device 10 waits until the start start request is received.

When the motor drive control device 10 receives the start start request (step S51: YES), the start management unit 25 of the motor drive control device 10 issues a first response including information indicating that the motor 50 can be started. It is transmitted to the host device 4 (step S52). If the motor drive control device 10 has already detected that the motor 50 cannot be started for some reason at the time of starting the server, the motor drive control device 10 starts the motor 50 in step S52. May send a first response containing information indicating that is not possible.

Next, the motor drive control device 10 activates the motor 50 (step S53). Specifically, as described above, the activation management unit 25 controls the drive control signal generation unit 11 (duty ratio determination unit 13) to enable the generation of the drive control signal Sd based on the drive command signal Sc. The drive control signal generation unit 11 generates the drive control signal Sd so that the motor 50 rotates at the rotation speed specified by the drive command signal Sc.

Next, the start management unit 25 of the motor drive control device 10 determines whether or not the start of the motor 50 is successful by the above-mentioned method (step S54). When the start of the motor 50 is successful (step S54: YES), the start management unit 25 receives a start result acquisition request from the host device 4, and then receives a second response including information indicating that the start of the motor 50 is successful. Is transmitted to the host device 4 (step S55). At this time, the activation management unit 25 may reset the stored activation failure count. After that, the motor drive control device 10 continues the motor drive control (steady operation) according to the drive command signal Sc (step S56).

On the other hand, when the start of the motor 50 fails (step S54: NO), the start management unit 25 stores (increments) the number of times the motor 50 has failed to start (step S57).

After step S57, the motor drive control device 10 determines whether or not the motor can be restarted (step S58). Specifically, the start management unit 25 determines whether or not the number of start failures of the motor 50 is equal to or less than a preset threshold value.

When the number of startup failures exceeds the threshold value (step S58: NO), the start-up management unit 25 determines that the motor 50 cannot be restarted, and receives a start-up result acquisition request from the host device 4. Later, along with the information indicating that the start of the motor 50 has failed, the information requesting the stop of the restart of the motor 50 is transmitted to the host device 4 as a second response (step S69).

On the other hand, when the number of startup failures is less than or equal to the threshold value (step S58: YES), the start-up management unit 25 determines that the motor 50 can be restarted, and receives a start-up result acquisition request from the host device 4. Later, information indicating that the start of the motor 50 has failed is transmitted to the host device 4 as a second response (step S59).

In steps S59 and S69, the start-up management unit 25 determines whether or not a heat generation problem has occurred, and information indicating whether or not a heat generation problem has occurred (for example, a measured value of temperature). The reference value th1, th2, th3, etc. and the comparison result) may be transmitted in addition to the second response.

After step S59, the motor drive control device 10 determines whether or not a restart request from the host device 4 has been received (step S60). If the restart request has not been received (step S60: NO), the motor drive control device 10 waits until the restart request is received.

When the motor drive control device 10 receives the restart request (step S60: YES), the motor drive control device 10 determines whether or not there is a problem of heat generation (step S61). Specifically, as described above, the activation management unit 25 compares the measured temperature value with the reference value (threshold value) th1 and determines whether or not the measured temperature value exceeds the reference value th1.

When the measured temperature value does not exceed the reference value th1 (step S61: NO), the activation management unit 25 determines that there is no problem of heat generation, and determines that there is no problem of heat generation, and the specified time included in the restart request received in step S60. Ti is set as the rest period T (step S64).

On the other hand, when the measured temperature value exceeds the reference value th1 (step S61: YES), the activation management unit 25 determines that there is a problem of heat generation, and should set it as the length of the rest period T. The value Ts of 2 is calculated (step S62). Specifically, as described above, the activation management unit 25 compares the measured value of the temperature with the plurality of threshold values th1, th2, th3, and an appropriate second value Ts (Ts1 / Ts2) based on the comparison result. / Ts3) is determined.

Next, the motor drive control device 10 sends a first response including information indicating that the motor 50 can be restarted and information on the rest period T set in step S63 or step S64 to the higher-level device 4. Transmit (step S65).

Next, the start management unit 25 starts the timing of the rest period T set in step S63 or step S64, controls the drive control signal generation unit 11 to stop the drive of the motor 50, and performs the lock protection operation. (Step S66).

Next, the activation management unit 25 determines whether or not the rest period T has elapsed (step S67). When the rest period T has not elapsed (step S67: NO), the start management unit 25 continues to stop the drive of the motor 50 (continue the lock protection operation).

When the rest period T has elapsed (step S67: YES), the start management unit 25 restarts the motor 50 (step S68). Specifically, as in step S53, the activation management unit 25 controls the drive control signal generation unit 11 to enable generation of the drive control signal Sd based on the drive command signal Sc. As a result, the drive control signal generation unit 11 generates the drive control signal Sd so that the motor 50 rotates at the rotation speed specified by the drive command signal Sc.

After that, the motor drive control device 10 shifts to step S54 and repeats the processes of steps S54 to S69 described above.

As described above, the motor drive control device 10 according to the present embodiment measures the temperature around the motor 50 by the temperature sensor 20, and based on the measured value of the temperature, the motor 50 is used before restarting the motor 50. The rest period T for stopping the driving (performing the lock protection operation) is set.

According to this, it is possible to suppress the heat generation of circuit parts such as the coil of the motor 50 and the transistors constituting the inverter circuit, etc. by repeatedly restarting the motor 50, and the damage caused by the heat generation of the motor 50 and the circuit parts can be suppressed. Can be suppressed.
Further, since the motor drive control device 10 itself monitors the heat generation state of the motor 50 and the like to determine the rest period T of the motor 50, as compared with the case where the rest period T is uniformly set on the host device 4, for example. , It becomes possible to set an appropriate restart timing according to the heat generation condition of the motor 50 and the like, and the process of determining the restart timing according to the temperature on the upper device 4 side becomes unnecessary, and the process of the upper device 4 It is possible to reduce the burden of.

Further, since the motor drive control device 10 sets the rest period T so that the rest period T becomes longer as the measured value of the temperature is higher, the motor 50 and the circuit parts constituting the motor drive control device 10 are in a heat generation state. Accordingly, it is possible to appropriately set the rest period T required for heat dissipation, and it is possible to more reliably prevent destruction of the motor 50, circuit parts, and the like due to heat generation when the motor 50 is restarted.

Further, when the motor drive control device 10 receives a start request (restart request) instructing the start of the motor 50, after the rest period T elapses, the motor drive control device 10 controls the drive control signal generation unit 11 to drive the motor 50. It enables the generation of the drive control signal Sd for the purpose. According to this, it is possible to restart the motor 50 at an appropriate timing according to the heat generation state of the motor 50, the circuit parts, and the like in response to the restart request from the host device 4.

Further, when the motor drive control device 10 receives the start request, the motor drive control device 10 transmits a first response including information indicating the length of the required rest period T to the outside (upper device 4). According to this, since the host device 4 can know the time until the restart of the motor 50 is executed, appropriate scheduling for the subsequent processing becomes possible. For example, the host device 4 can adjust the timing of transmitting the activation result acquisition request instructing the motor drive control device 10 to transmit the activation status of the motor 50 according to the notified rest period T. Therefore, it is possible to reduce unnecessary processing such as repeatedly transmitting a start result acquisition request until a response is obtained from the motor drive control device 10 side.

Further, the motor drive control device 10 sets the length of the rest period T as the designated time Ti (first value) specified by the start request when the measured temperature value does not exceed the predetermined reference value (th1). When the measured temperature value exceeds a predetermined reference value, the length of the rest period T is set to a second value Ts larger than the designated time Ti (first value).
According to this, if there is no problem of heat generation of the motor 50, circuit parts, etc., the motor 50 is restarted at the timing specified by the host device 4, so that the motor 50 can be restarted promptly. Become.

Further, the motor drive control device 10 determines whether or not the motor 50 can be restarted, and if it is determined that the motor 50 cannot be restarted, the motor drive control device 10 includes information requesting the stop of the restart. The first response is transmitted to the outside (upper device 4).
According to this, the host device 4 can know that the motor 50 cannot be started. Therefore, for example, for the restart process between the host device 4 and the motor drive control device 10. It is possible to avoid unnecessary repetition of communication.

<< Expansion of embodiment >>
Although the invention made by the present inventor has been specifically described above based on the embodiments, it is needless to say that the present invention is not limited thereto and can be variously modified without departing from the gist thereof. ..

For example, in the above embodiment, when the number of failure of starting the motor 50 exceeds the threshold value, the case where the motor drive control device 10 transmits information requesting the stop of restarting the motor 50 to the higher-level device 4 is exemplified. However, it is not limited to this. For example, when the measured temperature value exceeds a predetermined upper limit value (for example, a value having a threshold value th3 or more), the motor drive control device 10 transmits information requesting the stop of restarting the motor 50 to the higher-level device 4. You may.

Further, in the above embodiment, when the host device 4 receives information from the motor drive control device 10 indicating that there is a problem of heat generation of the motor 50, the host device 4 sets the designated time Ti for designating the rest period T as an initial value. It may be changed to a value larger than (for example, 1 second) (for example, 5 seconds) and transmitted to the motor drive control device 10 together with the restart request.
According to this, even on the upper device 4 side, it is possible to control the start of the motor in consideration of the heat generation state on the motor side.

The number of phases of the motor driven by the motor drive control device of the above-described embodiment is not limited to three phases. Further, the number of Hall elements is not limited to three.

The method of detecting the rotation speed of the motor is not particularly limited. For example, the rotation speed may be detected by a position sensorless method in which the rotation speed is detected by using the counter electromotive force induced in the motor coil without using a position detector such as a Hall element.

The above-mentioned sequence diagram and flow diagram are specific examples, and are not limited to the above-mentioned sequence diagram and flow diagram. For example, other processes may be inserted between each step, and the processes may be performed in parallel. It may be converted.

1 ... Fan system, 2 ... Motor drive control system, 3, 3a to 3d ... Fan device, 4 ... Upper device (external example), 5 ... Fan, 10 ... Motor drive control device, 11 ... Drive control signal generator, 12 ... Speed command analysis unit, 13 ... Duty ratio determination unit, 14 ... Energization control unit, 15 ... Communication unit, 16 ... Transmission unit, 17 ... Reception unit, 18 ... Communication control unit, 20 ... Temperature sensor, 21 ... Position sensor , 22 ... Rotation speed measurement unit, 23 ... Measurement data generation unit, 24 ... Measurement data storage unit, 25 ... Startup management unit, 26 ... Rest period storage unit, 27 ... FG signal generation unit, 30 ... Motor control circuit, 31 ... Motor drive circuit, 41 ... data processing control unit, 42 ... communication unit, 50 ... motor, 51 ... impeller (impeller), 240 ... measurement data, AD ... cooling target, Sc ... drive command signal, Sd ... drive control Signal, So ... Rotation speed signal, T ... Rest period, Ti ... Specified time (first value; length of rest period), Ts, Ts1 to Ts3 ... Second value (length of rest period).

Claims (10)

A motor control circuit that generates a drive control signal to control the drive of the motor,
A motor drive circuit that drives the motor based on the drive control signal,
Equipped with a temperature sensor that measures the temperature,
The motor control circuit is
A drive control signal generator that generates the drive control signal based on the drive command,
A measurement data generation unit that generates measurement data including the measurement value of the temperature by the temperature sensor, and a measurement data generation unit.
Based on the measured value of the temperature included in the measurement data, a rest period for stopping the drive of the motor before starting the restart of the motor is set, and the drive of the motor is performed during the rest period. A motor drive control device including a start control unit that controls the drive control signal generation unit so as to stop the motor. In the motor drive control device according to claim 1,
The start control unit is a motor drive control device that sets the rest period so that the higher the measured value of the temperature, the longer the rest period. In the motor drive control device according to claim 1 or 2.
The motor control circuit further has a communication unit that communicates with the outside, and has a communication unit.
The start management unit controls the drive control signal generation unit to drive the motor after the rest period elapses when the communication unit receives a start request instructing the start of the motor from the outside. A motor drive control device that enables the generation of the drive control signal for the purpose. In the motor drive control device according to claim 3,
When the communication unit receives the activation request from the outside, the activation management unit transmits a first response including information indicating the length of the rest period set to the outside via the communication unit. Motor drive control device. In the motor drive control device according to claim 4,
The start management unit includes information indicating whether or not the start of the motor is successful when the communication unit receives a start result acquisition request instructing transmission of the start status of the motor from the outside. A motor drive control device that transmits a response to the outside via the communication unit. The motor drive control device according to any one of claims 3 to 5.
When the measured value of the temperature does not exceed the reference value, the activation control unit sets the length of the rest period to the first value specified by the activation request, and the measured value of the temperature is the said. A motor drive control device that sets the length of the rest period to a second value larger than the first value when the reference value is exceeded. The motor drive control device according to any one of claims 3 to 6.
The start management unit determines whether or not the motor can be restarted, and if it determines that the motor cannot be restarted, the communication unit receives information requesting the cancellation of the restart. A motor drive control device that transmits to the outside via. The motor drive control device according to any one of claims 3 to 7.
It is equipped with a host device that communicates with the motor drive control device.
The host device is a motor drive control system that transmits the drive command and the start request to the motor drive control device. The motor drive control system according to claim 8 and
With the motor
A fan system including an impeller configured to be rotatable by the rotational force of the motor. A motor drive control device including a motor control circuit 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, and a temperature sensor that measures the temperature. It is a motor drive control method by
The first step in which the motor control circuit generates the drive control signal based on the drive command,
The second step in which the motor control circuit acquires measurement data including the temperature measurement value by the temperature sensor, and
A third step of setting a rest period for stopping the driving of the motor before the motor control circuit starts restarting the motor based on the measured value of the temperature included in the measurement data. Including
The first step is a motor drive control method including a step in which the motor control circuit controls the generation of the drive control signal so as to stop the drive of the motor during the rest period set in the third step. ..

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