WO2019189167A1

WO2019189167A1 - Identification method and identification device for identifying type of brushless dc motor

Info

Publication number: WO2019189167A1
Application number: PCT/JP2019/012831
Authority: WO
Inventors: 秀幸竹本
Original assignee: 日本電産株式会社
Priority date: 2018-03-28
Filing date: 2019-03-26
Publication date: 2019-10-03

Abstract

An exemplary identification method according to the present disclosure is used for an identification device that identifies the type of a brushless DC motor. Output response characteristics of the brushless DC motor vary from one type to another of a plurality of brushless DC motors. This method includes: supplying a power supply voltage from the identification device to the brushless DC motor through a power supply line; and identifying the type of the brushless DC motor on the basis of a driving current that, after the lapse of a prescribed time period after a first speed command value is given, flows through the power supply line in accordance with the rotational speed of the brushless DC motor which is accelerated toward a first speed in response to the first speed command value.

Description

Identification method and identification device for identifying type of brushless DC motor

The present disclosure relates to an identification method, an identification device, and a brushless DC motor for identifying the type of a brushless DC motor.

Many electronic devices include, for example, a fan motor as a cooling device for releasing heat generated inside to the outside. In an electronic device, a fan motor is electrically connected to a system controller and operates under the control of the system controller.

Patent Document 1 discloses an identification method in which a fan motor and a system controller communicate to acquire fan identification information. For example, the mode is switched from the normal mode to the command mode, and the fan motor and the system controller transmit and receive commands via a power supply line, a PWM (Pulse Width Modulation) line, and a TACH (Tachometer) line. The system controller acquires fan identification information by handshaking and determines compatibility with the fan motor. In this case, both the system controller and the fan require complicated control software such as switching between the normal mode and the command mode.

US Patent Application Publication No. 2006/0152891

A method for more easily identifying the type of brushless DC motor is desired.

The exemplary embodiment of the present disclosure provides a brushless DC motor identification method and identification apparatus capable of identifying the type of a brushless DC motor without particularly performing a handshake.

An exemplary identification method of the present disclosure is an identification method used for an identification device that identifies a type of a brushless DC motor, and an output response characteristic of the brushless DC motor is different for each type of a plurality of brushless DC motors. In response to the first speed command value, the power supply voltage is supplied from the identification device to the brushless DC motor via a power supply line, the power supply voltage is supplied from the identification device to the brushless DC motor via the power supply line. Based on the drive current after a predetermined time has elapsed since the first speed command value was applied, which flows through the power supply line according to the rotational speed of the brassless DC motor accelerating toward the first speed. Includes identifying the type.

An exemplary identification device of the present disclosure is an identification device that identifies a type of a brushless DC motor, and an output response characteristic of the brushless DC motor is different for each type of a plurality of brushless DC motors. A power supply terminal for supplying a power supply voltage via a power supply line, and a controller for identifying the type of the brushless DC motor, wherein the controller supplies the brushless DC motor with the power supply voltage and a speed The type of the brushless DC motor is identified based on the drive current that flows through the power supply line according to the rotational speed of the brassless DC motor that accelerates in response to the command and that has passed a predetermined time after the speed command is given. .

According to an exemplary embodiment of the present disclosure, a power supply voltage is applied to a brushless DC motor having different output response characteristics for each of a plurality of types of brushless DC motors, and the brushless DC motor is accelerated in response to a speed command. And measure the drive current flowing through the power line. Thus, a brushless DC motor identification method and identification apparatus capable of identifying the type of the brushless DC motor without performing handshake are provided.

FIG. 1 is a block diagram illustrating a typical block configuration example of a user system 100 and a brushless DC motor 200 according to an exemplary embodiment 1. FIG. 2 is a block diagram illustrating another block configuration example of the user system 100 and the brushless DC motor 200 according to the exemplary embodiment 1. FIG. 3 is a block diagram illustrating still another block configuration example of the user system 100 and the brushless DC motor 200 according to the exemplary embodiment 1. FIG. 4 is a flowchart of an identification method for identifying the type of the brushless DC motor 200 according to the exemplary embodiment 1. FIG. 5A is a graph illustrating a change in speed command applied to the brushless DC motor 200. FIG. 5B is a graph illustrating output response characteristics with respect to a speed command for each of a plurality of suppliers. FIG. 6 is a diagram illustrating a table used to identify the type of the brushless DC motor 200 in the exemplary embodiment 1. FIG. 7 is another flowchart of an identification method for identifying the type of the brushless DC motor 200 according to the exemplary embodiment 1. FIG. 8 is still another flowchart of the identification method for identifying the type of the brushless DC motor 200 according to the exemplary embodiment 1. FIG. 9 is a flowchart of an identification method for identifying the type of the brushless DC motor 200 according to the variation of the exemplary first embodiment. FIG. 10 is a graph illustrating output response characteristics with respect to a speed command for each of a plurality of suppliers. FIG. 11 is a diagram illustrating a table used to identify the type of the brushless DC motor 200 in the exemplary variation of the first embodiment. FIG. 12 is a graph illustrating the identification speed of suppliers A, B, and C. FIG. 13 is a block diagram illustrating a typical block configuration example of the user system 100 and the brushless DC motor 200 according to Exemplary Embodiment 2. FIG. 14 is a block diagram showing a more detailed block configuration example inside the user system 100. FIG. 15 is a flowchart of an identification method for identifying the type of the brushless DC motor 200 according to the second exemplary embodiment. FIG. 16A is a graph illustrating a change in speed command applied to the brushless DC motor. FIG. 16B is a graph showing the waveform of the drive current flowing in response to the speed command in the brushless DC motor of supplier A. FIG. 16C is a graph showing the waveform of the drive current flowing in response to the speed command in the brushless DC motor of supplier B. FIG. 16D is a graph showing a waveform of a drive current flowing in response to a speed command in the brushless DC motor of supplier C. FIG. 17 is a diagram illustrating a table used to identify the type of the brushless DC motor 200 in the exemplary embodiment 2. FIG. 18 is a flowchart of an identification method for identifying the type of the brushless DC motor 200 according to the second exemplary embodiment. FIG. 19 is a block diagram illustrating a typical block configuration example of the user system 100, the identification device 100A, and the brushless DC motor 200 according to Exemplary Embodiment 3. FIG. 20 is a block diagram illustrating another block configuration example of the user system 100, the identification device 100A, and the brushless DC motor 200 according to Exemplary Embodiment 3.

Hereinafter, embodiments of an identification method and an identification apparatus for identifying the type of a brushless DC motor according to the present disclosure will be described in detail with reference to the accompanying drawings. However, in order to avoid the following description from being unnecessarily redundant and to facilitate understanding by those skilled in the art, a more detailed description than necessary may be omitted. For example, detailed descriptions of already well-known matters and repeated descriptions for substantially the same configuration may be omitted. The embodiments of the present invention are not limited to the apparatus or method exemplified below. For example, it is possible to combine one embodiment with another embodiment.

[1-1. Configuration example of user system 100 and brushless DC motor 200]
FIG. 1 schematically shows a typical block configuration example of a user system 100 and a brushless DC motor 200 according to the present embodiment. In the present specification, the structure and operation of the brushless DC motor 200 will be described using a fan motor as an example. The brushless DC motor 200 of the present disclosure includes an inner rotor type or an outer rotor type motor. The brushless DC motor 200 is not limited to a fan motor, but is a brushless DC motor 200 used for various applications. The brushless DC motor 200 is, for example, a motor used in home appliances such as an air conditioner or a washing machine and a vehicle-mounted motor.

The user system 100 is electrically connected to the brushless DC motor 200. The user system 100 can supply power to the brushless DC motor 200. The user system 100 can be installed in a production management system for the brushless DC motor 200 in a factory that produces a variety of products. The user system 100 is a system in an electronic device or an in-vehicle system in which the brushless DC motor 200 can be mounted. For example, the brushless DC motor 200 is suitably mounted on an electronic device such as a server, a desktop personal computer main body, or a game machine. For example, when the brushless DC motor 200 having different specifications is produced at the same place, the user system 100 is a part of a series of inspection systems. Alternatively, when the brushless DC motor 200 is mounted as a fan motor in the main body of a server or a desktop personal computer, the user system 100 is an entire system composed of various electronic components mounted on a motherboard or one of them. Part.

The user system 100 includes a controller 110 and a memory 120, for example. As will be described later, the user system 100 according to the present embodiment has a function of identifying the type of the brushless DC motor 200. In other words, the user system 100 can be used as an identification device that identifies the type of the brushless DC motor 200. Therefore, in this specification, the user system 100 may be referred to as the identification device 100. The identification device 100 includes a power supply terminal for supplying a power supply voltage to the brushless DC motor 200 and a controller for identifying the type of the brushless DC motor 200. The identification device 100 supplies a power supply voltage to the brushless DC motor 200.

The controller 110 mainly controls the entire user system 100 and controls power supply to the brushless DC motor 200. The controller 110 can further identify the type of the brushless DC motor 200. The controller 110 is, for example, a semiconductor integrated circuit such as MCU (micro control unit) or FPGA (field programmable gate array).

For example, the controller 110 identifies the type of the brushless DC motor 200 based on the pulse signal in a state where the power supply voltage is supplied to the brushless DC motor. For example, the controller 110 includes a tachometer input terminal that is electrically connected to the tachometer output terminal and receives a pulse signal from the brushless DC motor 200. The controller 110 outputs a pulse representing the rotational speed of the brushless DC motor 200 output from the TACH terminal in accordance with the rotation of the brushless DC motor 200 that accelerates in response to the speed command in a state where the power supply voltage is supplied to the brushless DC motor 200. The type of the brushless DC motor 200 is identified based on the signal. That is, the type of the brushless DC motor 200 is identified based on the pulse signal representing the rotation speed of the brushless DC motor 200. Thereby, it is possible to identify the type of the brushless DC motor 200 without performing a handshake. The identification of the type of the brushless DC motor 200 will be described later in detail.

The memory 120 is, for example, a writable memory (for example, PROM), a rewritable memory (for example, flash memory), or a read-only memory. For example, the memory 120 stores a control program having a command group for causing the controller 110 to identify the type of the brushless DC motor 200. For example, the control program is temporarily expanded in a RAM (not shown) at the time of booting. Note that the memory 120 does not need to be externally attached to the controller 110 and may be mounted on the controller 110. The controller 110 equipped with the memory 120 is, for example, the MCU described above.

The user system 100 includes, for example, a Vmot terminal, a speed command (CONTROL) terminal, a TACH terminal, and a GND terminal as connection terminals for connection to the brushless DC motor 200. The speed command terminal of the user system 100 is an output terminal, and the TACH terminal is a tachometer input terminal.

The Vmot terminal is a terminal for motor power. For example, the motor power supply voltage Vmot in the range of 7.0 to 13.8V is supplied to the brushless DC motor 200 from the Vmot terminal.

The speed command terminal is a motor speed control terminal, for example, a PWM terminal, and is electrically connected to the speed command terminal of the brushless DC motor 200. For example, the controller 110 generates a PWM signal for controlling the rotation of the motor and outputs the PWM signal to the brushless DC motor 200 via the speed command terminal. The signal transmission method, that is, the speed command input is not limited to PWM, and may be, for example, PFM (pulse frequency modulation), PAM (pulse amplitude modulation), FLL (frequency locked loop), or PLL (phase locked loop).

The TACH terminal is an input terminal for a tachometer for monitoring the rotational speed of the motor, and is electrically connected to the TACH terminal of the brushless DC motor 200. The rotation speed is represented by, for example, the number of rotations (rpm) at which the motor rotates per unit time (1 minute) or the number of rotations (rps) at which the motor rotates per unit time (1 second). Two pulses per motor rotation are generally output from the TACH terminal of the fan motor. A pulse signal output from the TACH terminal of the brushless DC motor 200 in accordance with the rotation speed of the motor is input to the TACH terminal of the user system 100.

The brushless DC motor 200 is a fan motor having an impeller. Therefore, even in the brushless DC motor 200 that is a fan motor having an impeller, it is possible to identify the type of the brushless DC motor 200 without performing handshaking. The brushless DC motor 200 is a DC fan including an impeller, for example. The brushless DC motor 200 is, for example, an axial fan, a centrifugal fan, a cross flow fan, or a sirocco fan. The brushless DC motor 200 typically includes a regulator 210, a motor drive IC 220, an inverter 230, a circuit board CB on which those electronic components are mounted, a coil 240, and a hall element 250. For example, the regulator 210, the motor drive IC 220, the inverter 230, and the hall element 250 constitute a motor drive circuit for energizing the coil 240 to drive the motor. For example, the brushless DC motor 200 energizes a circuit board CB on which a power supply terminal for supplying a power supply voltage from the outside and a tachometer output terminal for outputting a pulse signal representing a rotation speed are arranged, and a coil and a coil. A driving circuit is provided.

The regulator 210 steps down the motor power supply voltage Vmot of 13.8V, for example, and generates the power supply voltage Vcc (for example, 5.0V) for the motor drive IC 220. In the brushless DC motor 200, the power supply voltage Vcc supplied to the motor drive IC 220 is preferably generated based on the motor power supply voltage Vmot. Thereby, it is not necessary to provide a terminal for the power supply voltage Vcc in the brushless DC motor 200, and the number of terminals and lead wires can be reduced. However, the power supply voltage Vcc may be supplied from the user system 100 to the brushless DC motor 200 separately from the motor power supply voltage Vmot.

The motor drive IC 220 is connected to the inverter 230. The motor drive IC 220 generates a control signal for controlling the inverter 230 according to the PWM signal transmitted from the user system 100.

The motor drive IC 220 monitors the rotational speed of the motor based on the output from the hall element 250, for example, and generates a pulse signal corresponding to the rotational speed of the motor, that is, a TACH signal. The output method is, for example, 2 pulses per rotation. However, a technique for generating a TACH signal without using a Hall element is known. When utilizing such a technique, the Hall element 250 is not required.

The inverter 230 is electrically connected to the motor drive IC 220 and the motor coil 240. The inverter 230 energizes the coil 240 of the motor by converting the power of the motor power supply voltage Vmot into the power supplied to the fan motor under the control of the motor drive IC 220.

The coil 240 is a winding of the motor.

The brushless DC motor 200 includes, for example, a circuit board CB on which a Vmot terminal, a speed command terminal, a TACH terminal, and a GND terminal corresponding to the terminal on the user system 100 side are arranged. The speed command terminal of the brushless DC motor 200 is an input terminal, and the TACH terminal is an output terminal. That is, the brushless DC motor 200 has a circuit board CB on which a tachometer output terminal for outputting a pulse signal corresponding to the rotation speed is arranged.

The output response characteristic of the brushless DC motor 200 is defined by the output response characteristic of the motor drive IC 220. The output response indicates a response of the rotational speed to the speed command value. More specifically, it means a response time (or delay time) from when the speed command value is given until the motor rotation speed reaches a speed corresponding to the command value. In other words, the response time is a time until the rotation speed of the motor shifts from the transient state to the steady state. In this embodiment, the response time is assigned to each type of the plurality of brushless DC motors 200 as unique information of the brushless DC motor 200.

For example, for each supplier that manufactures the brushless DC motor 200, a different response time can be assigned as unique information of the brushless DC motor 200. That is, the output response characteristics of the brushless DC motor 200 are different for each type of the plurality of brushless DC motors 200. It is possible to identify the type of brushless DC motor based on the output response characteristics. For example, a response time of 1 second (hereinafter referred to as “sec”) ± 0.3 sec is assigned to supplier A, a response time of 2 sec ± 0.3 sec is assigned to supplier B, and a response time of 3 sec ± 0.3 sec. Can be assigned to supplier C. Furthermore, different response times can be assigned to multiple suppliers.

For example, response time can be assigned as specific information for each product lot. For example, a response time of 1 sec ± 0.3 sec is assigned to product lot number A, a response time of 2 sec ± 0.3 sec is assigned to product lot number B, and a response time of 3 sec ± 0.3 sec is assigned to product lot number C. Can do. Further, different response times can be assigned to a plurality of product lot numbers. As described above, the types of the plurality of brushless DC motors 200 exist, for example, as many as the number of suppliers or as many as the number of product lots to be managed.

FIG. 2 schematically shows another block configuration example of the user system 100 and the brushless DC motor 200 according to the present embodiment.

As shown in the figure, identification of the type of the brushless DC motor 200 according to the present embodiment does not necessarily require a speed command terminal. Instead of giving a speed command value to the brushless DC motor 200 from the outside, for example, an MCU 221 mounted on the motor drive IC 220 can be used. The MCU 221 generates a PWM signal for controlling the rotation of the motor after the power supply voltage Vcc is turned on. In that case, the motor drive IC 220 generates a control signal for the inverter 230 in accordance with the PWM signal from the MCU 221 and outputs the control signal to the inverter 230.

FIG. 3 schematically shows still another block configuration example of the user system 100 and the brushless DC motor 200.

The user system 100 may further include a light emitting element 130. The light emitting element 130 includes, for example, a plurality of LEDs (Light Emitted Diode). The light emitting element 130 is a notification device that notifies the identification result of the type of the brushless DC motor 200. That is, the identification device 100 is used to notify the result of identifying the type of the brushless DC motor 200. Thereby, the identification result can be easily recognized. For example, the plurality of LEDs can be provided as many as the number of types of the plurality of brushless DC motors 200. For example, if there are two types of brushless DC motors 200 of suppliers A and B, two LEDs having different emission colors can be provided. For example, a red LED for supplier A and a blue LED for supplier B can be provided. That is, as a result of identifying the type of the brushless DC motor 200 from among the plurality of light emitting elements 130 assigned for each type of the brushless DC motor 200, the light emitting element 130 assigned to the brushless DC motor 200 to be identified. The light is emitted based on the above. Thereby, for example, a worker in a factory can visually recognize which supplier's motor the brushless DC motor 200 to be identified is.

[1-2. Method for identifying type of brushless DC motor 200]
FIG. 4 shows a flowchart of an identification method for identifying the type of the brushless DC motor 200 according to the present embodiment. In this embodiment, the type of the brushless DC motor 200 is identified by measuring the response time until the rotational speed reaches the threshold value from the initial speed based on the frequency of the pulse signal. Thereby, for example, the identification device 100 can identify the type of the brushless DC motor 200 only by measuring the response time. FIG. 5A illustrates a change in the speed command applied to the brushless DC motor 200, and FIG. 5B illustrates an output response characteristic with respect to the speed command for each of a plurality of suppliers. 5A and 5B, the horizontal axis represents time (seconds), and the vertical axis represents rotation speed (rpm).

The identification method according to the present embodiment is a method used for the identification device 100, for example. In order to prevent mixing of different types of motors in the process of manufacturing a wide variety of products equipped with motors, it is generally necessary to identify the type of brushless DC motor 200. That is, the identification method in the present embodiment is an identification method used for the identification device 100 that identifies the type of the brushless DC motor 200. For example, the identification method of the present disclosure is suitably used as a method for inspecting the suitability of the brushless DC motor 200 with respect to a user system when manufacturing a product in a factory. For example, the process of checking the suitability of the brushless DC motor 200 can be incorporated into a part of the product manufacturing process.

For example, a test mode is provided separately from the normal operation mode in which the brushless DC motor 200 is driven. The identification device 100 identifies the type of the brushless DC motor 200 by sequentially executing the following steps S100 to S300 in the test mode.

(Step S100)
A power supply voltage is supplied from the identification device 100 to the brushless DC motor 200 while the terminals of the identification device 100 (user system 100) and the brushless DC motor 200 are electrically connected to each other. As the power supply voltage for identification, for example, a voltage equal to the motor power supply voltage Vmot supplied to the brushless DC motor 200 in the normal operation mode is supplied.

(Step S210A)
The controller 110 obtains a pulse signal representing the rotational speed of the brushless DC motor 200 output from the TACH terminal as the brushless DC motor 200 accelerates toward the first speed in response to the first speed command value. . That is, the pulse signal represents the rotation speed of the brushless DC motor output from the tachometer output terminal in accordance with the rotation of the brushless DC motor 200 that accelerates toward the first speed in response to the first speed command value. For example, the controller 110 gives the first speed command value to the brushless DC motor 200 while the brushless DC motor 200 is stopped. In response to the first speed command value, the brushless DC motor 200 starts acceleration from the initial speed toward the first speed. The first speed is a speed given by the first speed command value. For example, the initial speed is zero when the motor is stopped. The controller 110 receives a pulse signal output from the TACH terminal as the brushless DC motor 200 rotates.

(Step S210B)
The controller 110 measures the response time until the motor rotation speed reaches the threshold value from the initial speed based on the frequency of the pulse signal. The frequency of the pulse signal represents the rotational speed of the brushless DC motor 200. The controller 110 can grasp the rotational speed of the brushless DC motor 200 by monitoring the frequency of the pulse signal.

For example, when the speed command shown in FIG. 5A is given to the brushless DC motor 200, the brushless DC motor 200 starts accelerating after the first speed command value is given, as shown in FIG. To reach. The second speed command value is a command value for giving a second speed that is an initial speed. At this time, the circuit board CB is further provided with a control terminal for inputting a speed command value for controlling the rotation speed, and before the first speed command value is given from the identification device 100 to the brushless DC motor, A second speed command value different from the first speed command value is given as the initial speed. As a result, the response time can be measured more accurately, so that more products can be identified. For example, the second speed command value is zero when identification is started from a state where the motor is stopped. That is, the initial speed is zero. As a result, the identification can be started from the state where the motor is stopped, and the identification of the product from the measurement time is easy.

Fig. 5B shows the linearly changing motor rotation speed for each supplier. However, the present invention is not limited to this example. For example, a delay time until the speed change is started may be set for each motor type, and the rotational speed may be changed exponentially according to the delay time.

In the present embodiment, the output response characteristics when the speed command value is changed are intentionally made different for each supplier, for example. As a result, the output response characteristics of the brushless DC motor 200 are different for each type of the plurality of brushless DC motors 200. For example, the response time of supplier A is 1 sec ± 0.3 sec, the response time of supplier B is 2 sec ± 0.3 sec, and the response time of supplier C is 3 sec ± 0.3 sec. ± 0.3 sec is the tolerance of the guaranteed value.

For example, the controller 110 measures the response time until the threshold value is reached by monitoring the frequency of the pulse signal at a time interval of 50 μs. For example, the threshold value is set to the first speed command value. For example, when the rotational speed changes exponentially, it can be said that the threshold is preferably set to a speed in the range of 10% to 90% of the first speed command value. Here, the threshold value is a speed in a range of 10% to 90% of the first speed command value. Thereby, variation in response time to be measured is suppressed, and more accurate identification is possible. Alternatively, the threshold value may be set to a speed lower than the first speed command value by a predetermined value. Here, the threshold value is a speed that is lower than the first speed command value by a predetermined value. Thereby, the calculation can be performed more easily than when the threshold value is determined by the ratio of the first speed command value.

For example, when the threshold value is set to 60% of the first speed command value, the controller 110 measures the response time Tr ± 0.5 sec until the threshold value is reached in the identification of supplier A. In the identification of B, the response time 2Tr ± 0.5 sec is measured, and in the identification of the supplier C, the response time 3Tr ± 0.5 sec is measured. For example, when a threshold is set for the first speed command value, the controller 110 measures a response time of 1 sec ± 0.5 sec in the identification of supplier A, and a response of 2 sec ± 0.5 sec in the identification of supplier B. The time is measured, and in the identification of supplier C, a response time of 3 sec ± 0.5 sec is measured. In the present embodiment, in consideration of a margin with respect to the tolerance of the guaranteed value ± 0.3 sec, the tolerance of the allowable value is set to ± 0.5 sec.

(Step S300)
The controller 110 identifies the type of the brushless DC motor 200 based on the measured response time. That is, the controller 110 outputs the brushless DC motor output from the tachometer output terminal in accordance with the rotation of the brushless DC motor that accelerates in response to a speed command value in a state where the power supply voltage is supplied to the brushless DC motor 200. The type of the brushless DC motor 200 is identified based on the pulse signal representing the rotation speed of the brushless DC motor 200. Specifically, the controller 110 refers to the table and identifies the type of motor based on the measured response time. That is, the type of the brushless DC motor 200 is identified based on the measured response time with reference to a table that associates the types of the plurality of brushless DC motors 200 with the unique information of the plurality of brushless DC motors 200. This facilitates processing for identifying the type of the brushless DC motor 200 and programming.

FIG. 6 illustrates a table used to identify the type of the brushless DC motor 200. The table is a lookup table (LUT) that associates the types of the plurality of brushless DC motors 200 with the unique information of the plurality of brushless DC motors 200. The unique information of the brushless DC motor 200 represents a response time that differs for each of the plurality of brushless DC motors 200. The table is stored in the memory 120, for example. As described above, the types of the plurality of brushless DC motors 200 exist for each supplier, for example, and there are three types of suppliers A, B, and C, for example. For example, the type of motor can be expressed by, for example, a 3-bit digital signal.

For example, the controller 110 may have an AD converter (not shown). The controller 110 converts the measured response time (analog value) into a digital signal. The unique information of the brushless DC motor 200 can also be expressed by a digital value having the same bit width as the resolution of AD conversion.

When the identification device 100, that is, the user system 100 completes the identification of the type of the brushless DC motor 200, the mode is switched from the test mode to the normal control mode. Thereafter, the user system 100 shifts to a normal motor drive sequence.

FIG. 7 shows another flowchart of the identification method for identifying the type of the brushless DC motor 200 according to the present embodiment.

This processing flow is different from the processing flow shown in FIG. 4 in that the first speed command value is further given after the second speed command value is given as the initial speed. The second speed command value is a non-zero speed, resulting in a non-zero initial speed. The second speed command value is smaller than the first speed command value.

Before giving the first speed command value, the second speed command value is given to the brushless DC motor 200 (step S210C). As shown in FIG. 5A, when the speed command is changed from the second speed command value (that is, the initial speed) to the first speed command value, the rotation speed of the motor is changed from the second speed to the first speed based on the output response characteristics. Change to speed. The type of the brushless DC motor 200 can be identified by measuring the response time from the second speed to the first speed while the brushless DC motor 200 is rotating.

According to the identification method of the present embodiment, it is possible to identify the type of the brushless DC motor 200 based on the response time only by changing the software used for the controller 110 on the system side. No hardware changes are necessary. Communication by the handshake between the identification device 100 and the brushless DC motor 200 as in the related art is unnecessary. Moreover, an existing power supply terminal can be used, and a dedicated terminal for identification need not be newly provided. Product cost can be reduced by reducing the number of parts.

The identification method of the present disclosure is suitably used not only when a product is manufactured, but also when, for example, a failed brushless DC motor 200 is replaced with a new brushless DC motor 200. It can be confirmed whether or not the replaced brushless DC motor 200 is compatible with the system. Also, for example, individual products equipped with the brushless DC motor 200 are connected to the Internet. So-called IoT (Internet of Things) is realized. For example, a supplier of an individual product equipped with the brushless DC motor 200 can identify a product equipped with a specific brushless DC motor 200 by analyzing big data including unique information of the brushless DC motor 200. . As a result, quality can be stabilized, for example, by preventing occurrence of defects.

FIG. 8 shows still another flowchart of the identification method for identifying the type of the brushless DC motor 200.

As shown in FIG. 8, the identification method according to the present embodiment can further include step S <b> 400 for notifying the result of identifying the type of the brushless DC motor 200.

As an example of the notification method, it is possible to notify the result of identifying the type of the brushless DC motor 200 using the light emitting element 130 (for example, a plurality of LEDs) shown in FIG. The controller 110 of the identification device 100 identifies the type of the brushless DC motor 200 from among the plurality of LEDs allocated for each type of the plurality of brushless DC motors 200, and the LED allocated to the brushless DC motor 200 to be identified. The light is emitted based on the result. The light emitting element 130 is not limited to an LED, and may be an element that notifies by light.

For example, a red LED can be assigned to the A supplier, a blue LED can be assigned to the B supplier, and a green LED can be assigned to the C supplier. When the controller 110 of the identification device 100 identifies the brushless DC motor 200 of the C supplier, the controller 110 causes the green LED to emit light. Thereby, for example, a worker in a factory can visually recognize whether or not the brushless DC motor 200 to be identified is a motor of a C supplier.

As another example, it is possible to notify the result of identifying the type of the brushless DC motor 200 using a display device (for example, a liquid crystal display) or a speaker. For example, the identification result can be displayed on the liquid crystal display as character information. For example, it is possible to change the level of the sound for each type of the plurality of brushless DC motors 200 and sound the speaker.

As another example, the controller 110 of the identification apparatus 100 may once write the identification result in the memory 120 or may transmit the identification result to another apparatus or device that requires the identification result. These forms are also modes for notifying the identification result.

FIG. 9 shows a flowchart of an identification method for identifying the type of the brushless DC motor 200 according to the variation of the present embodiment. FIG. 10 illustrates the output response characteristics with respect to the speed command for each of a plurality of suppliers. The horizontal axis indicates time (seconds), and the vertical axis indicates the rotation speed (rpm).

In this variation, the controller 110 supplies a first speed command value in response to the rotation of the brushless DC motor 200 that accelerates in response to the speed command in a state where the power supply voltage is supplied to the brushless DC motor 200. The type of the brushless DC motor 200 is identified based on a pulse signal output from the TACH terminal later. That is, with the rotation of the brushless DC motor 200 that accelerates toward the first speed in response to the first speed command value, it is output from the tachometer output terminal after a predetermined time has elapsed since the first speed command value was given. The type of the brushless DC motor 200 is identified based on the pulse signal representing the rotation speed of the brushless DC motor 200.

For example, the identification device 100 identifies the type of the brushless DC motor 200 by sequentially executing the following steps S100 to S300 in the test mode.

The identification device 100 supplies a power supply voltage to the brushless DC motor 200 (step S100).

Controller 110 obtains a pulse signal output from the TACH terminal after a predetermined time has elapsed since the first speed command value was given (step S210D). For example, the predetermined time is shorter than the response time until the rotational speed reaches the threshold value from the initial speed in the brushless DC motor 200 having the second best output response characteristic among the types of the plurality of brushless DC motors 200. It is set to become. In this embodiment, as shown in FIG. 10, the predetermined time is set to the response time of supplier B having the second best output response characteristic among suppliers A, B, and C, for example, 1.5 sec shorter than 2 sec. Thereby, it can suppress that the rotational speed of the some brushless DC motor 200 reaches a 1st speed, and the identification of the kind of brushless DC motor 200 becomes difficult. Further, for example, when the rotational speed changes exponentially, it can be said that it is preferable to set the threshold value to a speed in a range of 10% to 90% of the first speed command value. Here, the threshold value is a speed in a range of 10% to 90% of the first speed command value. As a result, variations in rotational speed measured within a predetermined time can be suppressed, and more accurate identification can be performed. Alternatively, the threshold value may be set to a speed lower than the first speed command value by a predetermined value. Here, the threshold value is a speed that is lower than the first speed command value by a predetermined value. Thus, the calculation can be performed more easily than when the threshold value is determined by the ratio of the first speed command value.

When attention is paid 1.5 seconds after the first speed command value is given, the brushless DC motor 200 of the supplier A has already reached the first speed, and the brushless DC motor 200 of the suppliers B and C It is accelerating towards speed. According to different output response characteristics among suppliers A, B and C, the rotational speeds of the brushless DC motor 200 after 1.5 seconds are different from each other.

Controller 110 measures the rotational speed of brushless DC motor 200 after a predetermined time has elapsed based on the frequency of the pulse signal (step S210E). That is, the type of the brushless DC motor 200 is identified by measuring the rotational speed of the brushless DC motor 200 after a predetermined time has elapsed based on the frequency of the pulse signal. Since it is only necessary to detect the rotational speed after a predetermined time has passed since the speed command value is given, the calculation load on the user system 100 side can be reduced. In addition, the time required for identification can be determined in advance. For example, 1.5 seconds after the first speed command value is given, the rotational speed of the brushless DC motor 200 of supplier A reaches the first speed v1. In this case, theoretically, the rotation speed of the brushless DC motor 200 of the supplier B reaches 82.5% of v1, and the rotation speed of the brushless DC motor 200 of the supplier B reaches 65% of v1. In this case, the controller 110 measures the rotation speed v1 in the identification of the supplier A, measures the rotation speed 0.825v1 in the identification of the supplier B, and measures the rotation speed 0.65v1 in the identification of the supplier C.

FIG. 11 illustrates a table used to identify the type of the brushless DC motor 200 in this variation.

The controller 110 refers to the table shown in FIG. 11 and identifies the type of the brushless DC motor 200 based on the rotational speed of the brushless DC motor 200 measured after a predetermined time has elapsed. In this example, the unique information of the brushless DC motor 200 is the rotation speed after a predetermined time has elapsed. That is, the type of the brushless DC motor 200 is identified by referring to a table that associates the types of the plurality of brushless DC motors 200 with the unique information of the plurality of brushless DC motors 200 and measured after a predetermined time has elapsed. This is based on the rotation speed. This facilitates processing for identifying the type of the brushless DC motor 200 and programming. For example, the controller 110 refers to the table to identify the brushless DC motor 200 to be identified as the motor of the supplier B based on the measured rotation speed 0.825v1. Also in this variation, the controller 110 may give the second speed command value as the initial speed before giving the first speed command value to the brushless DC motor 200. That is, the circuit board CB is further provided with a control terminal for inputting a speed command value for controlling the rotation speed, and before the first speed command value is given from the identification device 100 to the brushless DC motor, the first terminal is provided. A second speed command value different from the speed command value is given as the initial speed. Accordingly, since the response time can be measured more accurately, more brushless DC motors 200 can be identified. For example, the initial speed is zero. Thereby, since the identification can be started from the state where the motor is stopped, the identification of the brushless DC motor 200 from the response time is easy.

In one aspect, a different second speed command value can be assigned to each type of the plurality of brushless DC motors 200. In this case, for example, after the power supply voltage Vcc is input to the motor drive IC 220, the MCU 221 supplies the motor drive IC 220 with a command value for a different identification speed for each type of the plurality of brushless DC motors 200 as the second speed command value. Thereafter, the controller 110 gives the first speed command value to the brushless DC motor 200.

FIG. 12 illustrates the identification speed of suppliers A, B, and C. The horizontal axis indicates time (seconds), and the vertical axis indicates the rotation speed (rpm).

For example, the identification speed command value A is assigned to the brushless DC motor 200 of the supplier A. The MCU gives the identification speed command value A to the motor drive IC as the second speed command value. As a result, the rotational speed of the motor reaches the identification speed A. The identification speed command value B is assigned to the brushless DC motor 200 of the supplier B. The MCU gives the identification speed command value B to the motor drive IC as the second speed command value. As a result, the rotational speed of the motor reaches the identification speed B. The identification speed command value C is assigned to the brushless DC motor 200 of the supplier C. The MCU gives the identification speed command value C to the motor drive IC as the second speed command value. As a result, the rotational speed of the motor reaches the identification speed C. The identification speed A is a speed given by the identification speed command value A. Similarly, the identification speed B is a speed given by the identification speed command value B, and the identification speed C is a speed given by the identification speed command value C. The relationship between the magnitudes of the command values is first speed command value> identification speed command value C> identification speed command value B> identification speed command value A.

As shown in FIG. 12, the arrival time for the brushless DC motor 200 to reach the first speed from the identification speed is common among the suppliers A, B and C. The time is Tr. In other words, the brushless DC motor 200 reaches the first speed after the time Tr has elapsed since reaching the identification speed. Using this characteristic, it is possible to identify the type of the brushless DC motor 200 based on the identification speed and the rotation speed after the time Tr has elapsed, that is, the first speed. That is, the second speed command value differs for each type of the plurality of brushless DC motors 200, and the type of the brushless DC motor 200 is identified based on the initial speed and the rotation speed after a predetermined time has elapsed. More specifically, the type of the brushless DC motor 200 is identified based on the amount of change Δ in the rotational speed during the time Tr. The change amount Δ of supplier A is represented by “first speed−identification speed A”, the change amount Δ of supplier B is represented by “first speed−identification speed B”, and the change amount Δ of supplier C is It is expressed as “first speed-identification speed C”. For example, when detecting the change amount Δ of “first speed−identification speed A”, the controller 110 identifies the brushless DC motor 200 to be identified as the motor of the supplier A. Thus, the controller 110 can identify the type of the brushless DC motor 200 based on the amount of change Δ in the rotational speed during the time Tr.

The controller 110 according to the present embodiment is based on the drive current flowing through the power supply line according to the rotational speed of the brassless DC motor 200 that accelerates in response to the speed command in a state where the power supply voltage is supplied to the brushless DC motor 200. The type of the DC motor 200 is identified. That is, in the present embodiment, the type of brushless DC motor 200 is based on the drive current flowing through the power supply line according to the rotational speed of the brassless DC motor 200 that accelerates toward the first speed in response to the first speed command value. Identify Hereinafter, differences from the first embodiment will be mainly described.

[2-1. Configuration example of user system 100 and brushless DC motor 200]
FIG. 13 schematically shows a block configuration example of the user system 100 and the brushless DC motor 200 according to the present embodiment. FIG. 14 schematically shows a more detailed block configuration example inside the user system 100.

In this embodiment, unlike Embodiment 1, the pulse signal output from the TACH terminal is not measured. Therefore, this embodiment does not particularly require a TACH terminal, and the brushless DC motor 200 can be, for example, a two-wire motor having a power supply terminal and a GND terminal shown in FIG. Similarly to the first embodiment, the brushless DC motor 200 may further include a speed command terminal.

The user system 100 further includes, for example, a DC power supply 151, a current detector 152, and a discriminator 153. Hereinafter, when referring to the internal block configuration of the user system 100 or the identification device 100, the components of the controller 110, the DC power supply 151, the current detector 152, and the discriminator 153 may be simply referred to as “controller 110”. .

The DC power supply 151 is a constant voltage source, for example, and generates a motor power supply voltage Vmot (for example, 7.0 to 13.8 V) to be supplied to the brushless DC motor 200 in motor control in normal control and test modes. The DC power supply 151 may have a current limiting function for limiting the current.

The current detector 152 detects the drive current flowing through the power line in identifying the type of the brushless DC motor 200. The current detector 152 detects (or samples) the drive current at a time interval of 50 μs, for example. A drive current flows through the power supply line according to the rotation speed of the brushless DC motor 200. For example, in the case of a fan motor, it is known that a drive current proportional to the square or the cube of the rotation speed (or the number of rotations) flows in the power supply line. When the rotation speed changes, the drive current changes. That is, the drive current also changes according to the change in speed command.

The discriminator 153 measures the arrival time until the drive current reaches the threshold value from the initial current by monitoring the current detection value output from the current detector 152. The initial current is, for example, zero. This facilitates identification of the type of the brushless DC motor 200 from the response time. For example, the threshold value is set to a current in the range of 10% to 90% of the rated current. Thereby, variation in response time to be measured can be suppressed, and more accurate identification is possible. Alternatively, the threshold value is set to a current smaller than the rated current by a predetermined value. Thereby, calculation can be performed more easily than when the threshold value is determined by the ratio of the first speed command value. In the present embodiment, the arrival time differs for each type of the plurality of brushless DC motors 200. Further, the discriminator 153 identifies the type of the brushless DC motor 200 based on the measured arrival time. The discriminator 153 is typically mounted on the controller 110. That is, in this embodiment, the type of the brushless DC motor 200 is identified by measuring the arrival time until the drive current reaches the threshold value from the initial current. Thereby, for example, the identification device 100 can identify the type of the brushless DC motor 200 only by measuring the response time.

[2-2. Method for identifying type of brushless DC motor 200]
FIG. 15 shows a flowchart of an identification method for identifying the type of the brushless DC motor 200 according to the present embodiment.

(Step S100)
A power supply voltage is supplied from the identification device 100 to the brushless DC motor 200 while the terminals of the identification device 100 (user system 100) and the brushless DC motor 200 are electrically connected to each other. That is, the identification device 100 supplies a power supply voltage to the brushless DC motor 200 via the power supply line.

(Step S220A)
Before giving the first speed command value from the identification device 100 to the brushless DC motor 200, the second speed command value is given and an initial current is passed. Here, the brushless DC motor 200 has a circuit board on which a control terminal for inputting a speed command value for controlling the rotation speed is arranged, and gives the first speed command value from the identification device 100 to the brushless DC motor 200. Prior to applying the second speed command value different from the first speed command value, an initial current is caused to flow through the power supply line. Accordingly, since the response time can be measured more carefully, more types of brushless DC motors 200 can be identified. When the identification is started from the state where the brushless DC motor 200 is stopped, the initial speed of the motor is zero. In that case, the second speed command value may not be given to the brushless DC motor 200 in particular. By giving the first speed command value, the brushless DC motor 200 starts acceleration toward the first speed.

(Step S220B)
The drive current flowing according to the rotation speed of the brushless DC motor 200 that accelerates toward the first speed is detected by the current detector 152 at a time interval of 50 μs, for example.

FIG. 16A illustrates the change in the speed command given to the brushless DC motor. FIG. 16B illustrates the waveform of the drive current that flows in response to the speed command in the brushless DC motor of supplier A, and FIG. 16C illustrates the waveform of the drive current that flows in response to the speed command in the brushless DC motor of supplier B. FIG. 16D illustrates the waveform of the drive current that flows in response to the speed command in the brushless DC motor of supplier C. The horizontal axis indicates time (seconds). The vertical axis in FIG. 16A indicates the rotational speed (krpm), and the vertical axis in FIGS. 16B to 16D indicates the drive current (A).

Suppose that the speed command shown in FIG. 16A is given to the brushless DC motor 200. In that case, in the brushless DC motor 200 of supplier A, the drive current shown in FIG. 16B flows in response to the speed command. The initial current is 0.5A and the rated current is 1.2A. For example, the threshold value is set in a range of 10% to 90% of the rated current, that is, a range of 0.12A to 1.08A. Also in this embodiment, as output response characteristics, 1 sec ± 0.3 sec is assigned to the response time of supplier A, 2 sec ± 0.3 sec is assigned to the response time of supplier B, and 3 sec ± 0. Allocate 3 seconds. As shown in FIG. 16B to FIG. 16D, the arrival time for the drive current to reach from the initial current to the threshold value varies depending on the output response characteristics assigned to each supplier, and as a result, for the suppliers A, B and C, Different values are shown.

(Step S220C)
The discriminator 153 monitors the current detection value output from the current detector 152, that is, the time change of the current waveform, thereby measuring the arrival time until the drive current reaches the threshold value from the initial current. For example, when the threshold value is set to 0.9 A, the discriminator 153 measures arrival time 0.0025 sec in identifying supplier A, and measures arrival time 0.005 sec in identifying supplier B. Supplier C In the identification, the arrival time of 0.01 sec is measured.

(Step S300)
FIG. 17 illustrates a table used for identifying the type of the brushless DC motor 200.

The discriminator 153 refers to a table that associates the types of the plurality of brushless DC motors 200 with the unique information of the plurality of brushless DC motors 200, and identifies the type of the brushless DC motor 200 based on the measured arrival time. The unique information of the brushless DC motor 200 is the arrival time described above. That is, the type of the brushless DC motor 200 is identified based on the measured arrival time with reference to a table that associates the types of the plurality of brushless DC motors 200 with the unique information of the plurality of brushless DC motors 200. This facilitates processing for identifying the type of the brushless DC motor 200 and programming. For example, the discriminator 153 identifies the brushless DC motor 200 to be identified as the motor of the supplier B based on the measured arrival time 0.005 sec by referring to the table.

According to the identification method of the present embodiment, communication by handshake between the identification device 100 and the brushless DC motor 200 is unnecessary as in the first embodiment. Moreover, an existing power supply terminal can be used, and a dedicated terminal for identification need not be newly provided. Product cost can be reduced by reducing the number of parts. The identification method can be suitably used for a two-wire motor.

FIG. 18 shows a flowchart of an identification method for identifying the type of the brushless DC motor 200 according to the variation of this embodiment.

As shown in FIG. 16B to FIG. 16D, the drive current that flows in response to the speed command changes according to the output response characteristic unique to the brushless DC motor 200. Therefore, the drive currents that flow after a predetermined time has elapsed since the speed command changes are different among suppliers A, B, and C. In this variation, the type of the brushless DC motor 200 is identified using this characteristic. In other words, the identification method in this variation provides the first speed command value that flows through the power supply line according to the rotational speed of the brushless DC motor 200 that accelerates toward the first speed in response to the first speed command value. The type of the brushless DC motor 200 is identified based on the drive current after a predetermined time.

The controller 110 according to this variation gives a speed command value that flows through the power line in accordance with the rotational speed of the brushless DC motor 200 that accelerates in response to the speed command in a state where the power supply voltage is supplied to the brushless DC motor 200. The type of the brushless DC motor 200 is identified based on the drive current after a predetermined time has elapsed.

The current detector 152 responds to the first speed command value and flows according to the rotation speed of the brushless DC motor 200 that accelerates toward the first speed. The drive current after a predetermined time has elapsed since the speed command value changed. Is detected (step S20D). In this variation as well, before the first speed command value is given from the identification device 100 to the brushless DC motor 200, the second speed command value may be given and the initial current may flow. Furthermore, as described in the first embodiment, a second speed command value that is different for each type of the plurality of brushless DC motors 200 may be given to the brushless DC motor 200 as an identification speed command value. At this time, the second speed command value differs for each type of the plurality of brushless DC motors 200, and the type of the brushless DC motor 200 is identified based on the initial speed and the rotational speed after a predetermined time has elapsed. Thus, the controller 110 can identify the type of the brushless DC motor 200 based on the amount of change in the drive current during a certain time. The predetermined time is shorter than the arrival time until the drive current reaches the threshold value from the initial current in the brushless DC motor 200 having the second best output response characteristic among the types of the plurality of brushless DC motors 200. Is set. Thereby, it can suppress that the drive current of the some brushless DC motor 200 reaches a threshold value, and it becomes difficult to identify the kind of brushless DC motor 200. FIG. In this variation, the predetermined time can be set to the arrival time of supplier B, for example, 0.004 sec, which is shorter than 0.005 sec. In that case, the current detector 152 detects the drive current flowing through the power supply line 0.004 sec after the speed command changes.

The classifier 153 refers to a table that associates the types of the plurality of brushless DC motors 200 with the unique information of the plurality of brushless DC motors 200, and determines the types of the brushless DC motors 200 based on the drive current measured after 0.004 sec. Identify. The unique information of the brushless DC motor 200 is a drive current measured after 0.004 sec. That is, identification of the type of the brushless DC motor 200 is based on a drive current measured after a predetermined time has elapsed with reference to a table that associates the types of the plurality of brushless DC motors 200 with the unique information of the plurality of brushless DC motors 200. Do it.
Further, when the above-described identification speed command value is given, for example, the discriminator 153 identifies the type of the brushless DC motor 200 based on the initial current and the drive current measured after 0.004 sec.

In this variation, the unique information of the brushless DC motor 200 is acquired by measuring the drive current flowing through the power supply line after a predetermined time has elapsed. According to this variation, it is only necessary to detect the drive current after a predetermined time has elapsed after giving the speed command value, so that the calculation load on the user system 100 side can be reduced. In addition, the time required for identification can be determined in advance.

FIG. 19 schematically illustrates a typical block configuration example of the user system 100, the identification device 100A, and the brushless DC motor 200.

Unlike the first or second embodiment, the identification device 100A according to the present embodiment is a separate device from the user system 100. FIG. 19 shows a configuration and connection example of an identification device 100A that is connected to the brushless DC motor 200 shown in FIG. 1 and includes a Vmot terminal, a GND terminal, a speed command terminal, and a TACH terminal. However, it is also possible to connect the identification device 100A to the 2-wire motor described in the second embodiment.

The identification device 100A includes, for example, an MCU 110A and a light emitting element 130. The identification device 100A includes a Vmot terminal, a GND terminal, and a TACH terminal as terminals necessary for identifying the type of the brushless DC motor 200.

The user system 100, the identification device 100A, and the brushless DC motor 200 are electrically connected to each other among the Vmot terminal, the GND terminal, and the TACH terminal. In this configuration example, the power supply voltage is supplied from the identification device 100A to the brushless DC motor 200 via the Vmot terminal, and the PWM signal is supplied from the user system 100 to the brushless DC motor 200 via the speed command terminal.

The identification device 100A can identify the type of the brushless DC motor 200, for example, according to the processing flow shown in FIG. The MCU 110A may transmit the identification result to the controller 110 of the user system 100.

FIG. 20 schematically illustrates another block configuration example of the user system 100, the identification device 100A, and the brushless DC motor 200.

The identification device 100A is electrically connected to the user system 100 and the brushless DC motor 200 through, for example, a test point (TP). TP1 is a power supply TP. TP2 is a TP for TACH. TP3 is a TP for GND. A dedicated probe can be connected to the identification device 100A and the type of the brushless DC motor 200 can be identified by applying the probe to the TP.

The embodiment of the present disclosure is widely used in various devices including various fan motors such as a personal computer, a game machine, a vacuum cleaner, a dryer, a washing machine, and a refrigerator.

Claims

An identification method used for an identification device for identifying the type of a brushless DC motor,
The output response characteristics of the brushless DC motor are different for each type of the plurality of brushless DC motors.
Supplying a power supply voltage from the identification device to the brushless DC motor via a power supply line;
A driving current flowing through the power supply line according to the rotational speed of the brassless DC motor that accelerates toward the first speed in response to the first speed command value, and after a predetermined time has elapsed since the first speed command value was given. Based on the above, the type of the brushless DC motor is identified.
The identification method according to claim 1,
Acquisition of the unique information of the brushless DC motor is performed by measuring the drive current flowing through the power line after the predetermined time has elapsed.
The identification method according to claim 2,
The predetermined time is shorter than the arrival time until the drive current reaches the threshold value from the initial current in the brushless DC motor having the second best output response characteristic among the types of the plurality of brushless DC motors. .
The identification method according to claim 2,
The brushless DC motor has a circuit board on which a control terminal for inputting a speed command value for controlling the rotational speed is arranged,
Further, by supplying a second speed command value different from the first speed command value before giving the first speed command value from the identification device to the brushless DC motor, the initial current is caused to flow through the power supply line. .
The identification method according to claim 4,
The initial current is zero.
The identification method according to claim 3,
The second speed command value is different for each type of the plurality of brushless DC motors,
The type of the brushless DC motor is identified based on the initial current and the drive current measured after the predetermined time has elapsed.
The identification method according to any one of claims 3 to 5,
The threshold value is a current in the range of 10% to 90% of the rated current.
The identification method according to any one of claims 3 to 5,
The threshold value is a current smaller than a rated current by a predetermined value.
The identification method according to any one of claims 2 to 8,
The type of the brushless DC motor is identified based on the drive current measured after the predetermined time has elapsed with reference to a table that associates the types of the plurality of brushless DC motors with the unique information of the plurality of brushless DC motors. .
The identification method according to any one of claims 2 to 9,
Furthermore, the identification device is used to notify the result of identifying information related to the brushless DC motor.
The identification method according to any one of claims 1 to 9,
Furthermore, based on the result of identifying the type of the brushless DC motor, the light emitting element assigned to the brushless DC motor to be identified is selected from the plurality of light emitting elements assigned for each type of the plurality of brushless DC motors. Make it emit light.
The identification method according to any one of claims 1 to 11,
The brushless DC motor is a fan motor having an impeller.
An identification device for identifying the type of a brushless DC motor,
The output response characteristics of the brushless DC motor are different for each type of the plurality of brushless DC motors.
A power supply terminal for supplying a power supply voltage to the brushless DC motor via a power supply line;
A controller for identifying the type of the brushless DC motor,
The controller supplies the speed command that flows through the power line in accordance with the rotational speed of the brassless DC motor that accelerates in response to the speed command in a state where the power supply voltage is supplied to the brushless DC motor. The type of the brushless DC motor is identified based on the drive current after the elapse of time.