Motor winding temperature detection device, motor winding temperature detection method, motor manufacturing method, air conditioner manufacturing method, and program

Abstract

To provide a winding temperature detection device of a motor capable of more accurately detecting temperature of a winding when supply of power is stopped, a winding temperature detection method of the motor, a manufacturing method of the motor, a manufacturing method of an air conditioner, and a program.SOLUTION: With a winding temperature detection device 1A for a motor 2, a control device 50 measures time from when a power supply device 10 stops supply of power to when a resistance measuring device 20 measures resistance of winding to acquire a second resistance value, estimates a resistance value of the winding when the power supply device 10 stops supply of power based on a correlation between the measured time and the second resistance value acquired by the resistance measuring device 20, and further applies an estimated resistance value, a first resistance value acquired by the resistance measuring device 20, and a value of environmental temperature measured by a temperature measuring device 40 to a relational equation indicating a relation between the resistance of the winding and the environmental temperature to obtain temperature of the winding when the power supply device 10 stops supply of power.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a motor winding temperature detection device, a motor winding temperature detection method, a motor manufacturing method, an air conditioner manufacturing method, and a program. [Background technology]

[0002] Some motors have a stator with windings attached to a core. In such motors, when current flows through the windings, the windings and the core heat up, and this heat can cause the windings to become too hot. This can result in damage to the windings or failure of the motor itself. Therefore, motor winding temperature detection devices have been developed to prevent winding damage or motor failure.

[0003] For example, Patent Document 1 discloses a winding temperature detection device that includes a current measuring device that measures the current flowing through the windings, a voltage measuring device that measures the voltage applied to the windings, a stop detection circuit that detects when the motor has stopped, and a computing device that, when the stop detection circuit detects that the motor has stopped, calculates the resistance of the windings based on the current value measured by the current measuring device and the voltage value measured by the voltage measuring device, and detects the temperature of the windings based on the calculated resistance. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2004-208453 Summary of the Invention [Problem to be solved by the invention]

[0005] In the manufacture and design of motors, it is sometimes necessary to evaluate whether the temperature of the motor windings is within a specified range during a relatively short period of operation before the winding temperature reaches a certain temperature.

[0006] However, with the winding temperature detection device described in Patent Document 1, there may be a time lag between when the power supply to the motor is stopped and when the motor's output shaft actually stops, which may result in the inability to accurately detect the temperature of the windings when the motor is stopped.

[0007] The present disclosure has been made to solve the above-mentioned problems, and aims to provide a motor winding temperature detection device, a motor winding temperature detection method, a motor manufacturing method, an air conditioner manufacturing method, and a program that can more accurately detect the temperature of the windings when the power supply is stopped. [Means for solving the problem]

[0008] To achieve the above object, a motor winding temperature detection device according to the present disclosure includes a power supply device, a resistance measuring device, a temperature measuring device, and a control device. The power supply device supplies power to the motor to drive it. The resistance measuring device measures the resistance of the motor's windings to obtain a first resistance value before the power supply device starts supplying power, and measures the resistance of the windings to obtain a second resistance value after the power supply device stops supplying power and the motor has stopped rotating. The temperature measuring device measures the temperature of the environment in which the motor is installed when the resistance measuring device measures the resistance of the windings to obtain the first resistance value. The control device measures the time from when the power supply device stops supplying power to when the resistance measuring device measures the resistance of the winding and obtains the second resistance value, and estimates the resistance value of the winding when the power supply device stopped supplying power based on the correlation between the measured time and the second resistance value obtained by the resistance measuring device.The control device then applies the estimated resistance value, the first resistance value obtained by the resistance measuring device, and the environmental temperature value measured by the temperature measuring device to a relational equation that shows the relationship between the resistance of the winding and the environmental temperature, thereby determining the temperature of the winding when the power supply device stopped supplying power. [Effects of the Invention]

[0009] According to the configuration of the present disclosure, the control device measures the time from when the power supply device stops supplying power to when the resistance measuring device measures the resistance of the windings and obtains the second resistance value, estimates the resistance of the windings when the power supply device stopped supplying power based on the correlation between the measured time and the second resistance value obtained by the resistance measuring device, and then applies the estimated resistance value, the first resistance value obtained by the resistance measuring device, and the environmental temperature measured by the temperature measuring device to a relational expression that shows the relationship between the resistance of the windings and the environmental temperature to obtain the temperature of the windings when the power supply device stopped supplying power. Therefore, even if there is a time lag between when the power supply device stops supplying power and when the motor output shaft actually stops, the temperature of the windings when the power supply device stopped supplying power can be detected more accurately. [Brief explanation of the drawings]

[0010] [Figure 1] Circuit diagram of a winding temperature detection device according to a first embodiment of the present disclosure. [Figure 2] Block diagram of a winding temperature detection device according to a first embodiment of the present disclosure. [Figure 3] 1 is a flowchart of a winding temperature detection process performed by a control device included in the winding temperature detection device according to the first embodiment of the present disclosure. [Figure 4] FIG. 1 is a circuit diagram illustrating the open and closed states of electrical contacts when measuring the resistance of a motor winding with a resistance measuring device included in a winding temperature detection device according to a first embodiment of the present disclosure. [Figure 5] Graph showing changes in motor winding resistance [Figure 6] Circuit diagram of a winding temperature detection device according to a second embodiment of the present disclosure. [Figure 7] FIG. 10 is a circuit diagram showing a state where a brake included in the winding temperature detection device according to the second embodiment of the present disclosure abuts against an output shaft of a motor. [Figure 8] 10 is a circuit diagram illustrating a state where a brake provided in a winding temperature detection device according to a second embodiment of the present disclosure is in contact with an output shaft of a motor and a resistance measuring device is measuring the resistance of a winding of the motor. [Figure 9] Circuit diagram of a winding temperature detection device according to a third embodiment of the present disclosure. [Figure 10] FIG. 10 is a circuit diagram of a resistor included in a winding temperature detection device according to a third embodiment of the present disclosure when electrically connected to a motor. [Figure 11] FIG. 10 is a circuit diagram showing a state where a resistance measuring device included in a winding temperature detection device according to a third embodiment of the present disclosure measures the resistance of a motor winding. [Figure 12] Circuit diagram of a winding temperature detection device according to a fourth embodiment of the present disclosure. [Figure 13] FIG. 10 is a circuit diagram when an electromagnetic contactor provided in a winding temperature detection device according to a fourth embodiment of the present disclosure is switched to a state in which the motor and a resistance measuring device are connected. [Figure 14] Circuit diagram of a winding temperature detection device according to a fifth embodiment of the present disclosure. [Figure 15] FIG. 10 is a circuit diagram when an electromagnetic contactor provided in a winding temperature detection device according to a fifth embodiment of the present disclosure is switched to a state in which the motor and a resistance measuring device are connected. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, a motor winding temperature detection device, a motor winding temperature detection method, a motor manufacturing method, an air conditioner manufacturing method, and a program according to embodiments of the present disclosure will be described in detail with reference to the drawings. In the drawings, the same or equivalent parts are designated by the same reference numerals.

[0012] (Embodiment 1) The motor winding temperature detection device according to the first embodiment is a device that drives a motor for a fixed time for a winding temperature test and then detects the temperature of the motor windings. The configuration of the winding temperature detection device 1A will be described below with reference to Figures 1 and 2, using as an example a case where the winding temperature of a motor that is incorporated into a compressor of an air conditioner and that includes a stator with three-phase windings and a rotor with permanent magnets is detected.

[0013] Fig. 1 is a circuit diagram of a winding temperature detecting device 1A according to embodiment 1. Fig. 2 is a block diagram of the winding temperature detecting device 1A.

[0014] As shown in FIG. 1, winding temperature detection device 1A includes power supply device 10 that supplies power to drive motor 2, the winding temperature of which is to be tested; resistance measuring device 20 that measures the resistance of the windings of motor 2; power measuring device 30 that measures the back electromotive force of motor 2; temperature measuring device 40 that measures the temperature of the environment in which motor 2 is installed; and control device 50 that issues a command to resistance measuring device 20 to measure resistance based on the measurement data of power measuring device 30, and calculates the temperature of the windings of motor 2 based on the measurement data measured by resistance measuring device 20 and temperature measuring device 40.

[0015] The power supply device 10 supplies power to the motor 2 to be detected. The motor 2 to be detected, which is the destination of the power supply, is a motor driven by three-phase modulation. Therefore, the power supply device 10 has three electric wires 11-13. When the motor 2 to be detected is connected to the electric wires 11-13 for a winding temperature test, the power supply device 10 outputs U-phase, V-phase, and W-phase voltages to the electric wires 11-13, respectively, in response to a power supply command from the control device 50. In this way, the power supply device 10 drives the motor 2 to be detected by pulse width modulation (PWM) based on the command from the control device 50. As a result, the power supply device 10 supplies the motor 2 with the power determined in the winding temperature test.

[0016] The power supply device 10 may be configured with an AC power supply or a DC power supply, and may also include an inverter.

[0017] On the other hand, the electric wires 11-13 are provided with electric contacts 14-16, respectively, and the electric contacts 14-16 are provided with electromagnetic contactors 17.

[0018] Specifically, electrical contacts 14-16 are provided between the power supply device 10 and the motor 2 for each of the electric wires 11-13. The electrical contacts 14-16 are provided with electromagnetic contactors 17 electrically connected to the control device 50. The electromagnetic contactors 17 open and close the electrical contacts 14-16 in response to a command from the control device 50. More specifically, the electromagnetic contactors 17 electrically connect the power supply device 10 and the motor 2 by closing the electrical contacts 14-16 in response to a command from the control device 50. The electromagnetic contactors 17 also electrically disconnect the power supply device 10 and the motor 2 by opening the electrical contacts 14-16 in response to a command from the control device 50.

[0019] In winding temperature detecting device 1A, power supply device 10 drives motor 2, and after the motor has been driven, resistance measuring device 20 measures the resistance of the windings of motor 2. By opening and closing electrical contacts 14-16 described above, electromagnetic contactor 17 switches the circuit of winding temperature detecting device 1A between a state in which power supply device 10 and motor 2 are electrically connected and capable of driving motor 2, and a state in which power supply device 10 and motor 2 are electrically disconnected and capable of using resistance measuring device 20 to measure the resistance of the windings of motor 2.

[0020] Resistance measuring device 20 measures the resistance of the windings of motor 2 while electromagnetic contactor 17 electrically separates power supply device 10 from motor 2. To more accurately measure the resistance of the windings of motor 2, resistance measuring device 20 is connected by electric wires 21-23 to points P1-P3 of electric wires 11-13, which are located between electric contacts 14-16 and motor 2, respectively.

[0021] Electrical contacts 24-26 are provided on the electric wires 21-23, respectively. Electromagnetic contactors 27, which are electrically connected to the control device 50, are provided on the electrical contacts 24-26. The electromagnetic contactors 27 open and close the electrical contacts 24-26 in response to commands from the control device 50. The electromagnetic contactors 27 electrically connect the resistance measuring device 20 to the above-mentioned points P1-P3 while the electrical contacts 24-26 are closed. This allows the resistance measuring device 20 to measure the resistance of the windings of the motor 2.

[0022] Resistance measuring device 20 is electrically connected to control device 50 and measures electrical resistance in response to commands from control device 50. With electromagnetic contactor 27 electrically connecting resistance measuring device 20 to the above-mentioned points P1-P3, resistance measuring device 20 measures the resistance of the windings of motor 2 in response to commands from control device 50. After measurement, resistance measuring device 20 transmits data on the measured resistance of the windings of motor 2 to control device 50.

[0023] On the other hand, electric wires 31-33 are connected to points P4-P6 of electric wires 11-13, which are located between electric contacts 14-16 and power supply device 10, respectively. Then, electric wires 31-33 extend to power meter 30, thereby connecting points P4-P6 and power meter 30.

[0024] The power meter 30 is a device that measures voltage and current and calculates power from these voltages and currents. The power meter 30 is connected to the electric circuit formed by the power supply device 10 and the motor 2 by the above-mentioned electric wires 31-33. The power meter 30 measures the power of the motor 2 when the electromagnetic contactor 17 closes the electric contacts 14-16 to electrically connect the power supply device 10 and the motor 2.

[0025] For example, if the power supply device 10 stops supplying power to the motor 2 while the electromagnetic contactor 17 is electrically connecting the power supply device 10 and the motor 2, the rotation of the output shaft 3 of the motor 2 does not immediately stop when the power supply is stopped, but rather the output shaft 3 of the motor 2 continues to rotate for a while due to inertial force. As a result, a back electromotive force is generated in the windings of the motor 2. The power measuring device 30 measures this back electromotive force.

[0026] Like the resistance measuring device 20, the power measuring device 30 is electrically connected to the control device 50. The power measuring device 30 periodically measures power and transmits the measurement results to the control device 50 after each measurement. For example, when the electromagnetic contactor 17 electrically connects the power supply device 10 and the motor 2, the power measuring device 30 measures the power consumption or back electromotive force of the motor 2 and transmits data on the measured power to the control device 50.

[0027] Although not shown, the motor 2 has a casing that houses a stator with the above-mentioned three-phase windings and a rotor with permanent magnets. The casing is fitted with a temperature measuring device 40 shown in FIG. 1. The temperature measuring device 40 measures the temperature around the casing, in other words, the environmental temperature. The temperature measuring device 40, like the power measuring device 30, is electrically connected to the control device 50. The temperature measuring device 40 also periodically measures the temperature and transmits the measurement results to the control device 50 after each measurement.

[0028] As shown in FIG. 2, the control device 50 includes a computer including a CPU (Central Processing Unit) 51 and a memory including a ROM (Read-Only Memory) 52 and a RAM (Random Access Memory) 53. For example, the control device 50 is a programmable logic controller, which is a type of computer. The control device 50 also includes a storage device 54 that stores winding temperature calculation data 541. The control device 50 also includes an I / O port (Input / Output Port) 55. The above-mentioned electromagnetic contactors 17 and 27 are connected to the I / O port 55. The power supply device 10, the resistance measuring device 20, the power measuring device 30, and the temperature measuring device 40 are also connected to the I / O port 55. As a result, the control device 50 transmits and receives data to and from these devices.

[0029] The control device 50 performs various processes for controlling the components of the winding temperature detecting device 1A by causing the CPU 51 to read out various programs stored in the ROM 52 into the RAM and execute the programs.

[0030] For example, the control device 50 acquires measurement results from the power measuring device 30 and the temperature measuring device 40 by having the CPU 51 execute a winding temperature detection program. Furthermore, by executing this program, the control device 50 controls the opening and closing of the electrical contacts 14-16 by the electromagnetic contactor 17 and the start or stop of power supply by the power supply device 10. Alternatively, the control device 50 controls the opening and closing of the electrical contacts 24-26 by the electromagnetic contactor 27 and the measurement of the resistance of the windings of the motor 2 by the resistance measuring device 20. Furthermore, by executing this program, the control device 50 uses a timer unit, i.e., a timekeeping unit, included in the CPU 51 to measure the control time of each component.

[0031] By this processing, when the motor 2 is connected to the electric wires 11-13, the control device 50 drives the motor 2 for a certain period of time and performs a winding temperature detection process to detect the temperature of the windings of the motor 2 after the driving.

[0032] Next, the winding temperature detection process performed by the control device 50 will be described in detail with reference to Figures 3 to 5. In the following description, it is assumed that the winding temperature detection device 1A has a start button (not shown) connected to the control device 50. It is assumed that the user of the winding temperature detection device 1A presses the start button, causing the winding temperature detection device 1A to start the winding temperature detection process.

[0033] Fig. 3 is a flowchart of the winding temperature detection process performed by the control device 50 included in the winding temperature detecting device 1A. Fig. 4 is a circuit diagram showing the open / closed states of the electrical contacts 14-16 and 24-26 when the resistance measuring device 20 included in the winding temperature detecting device 1A measures the resistance of the windings of the motor 2.

[0034] First, the user of winding temperature detection device 1A connects motor 2, the target of a winding temperature test, to electric wires 11-13. The user also attaches temperature measuring device 40 to the casing of motor 2. Then, the user leaves motor 2 in this state for a while. This causes the temperature of the casing of motor 2 to become the same as the temperature of the environment in which motor 2 is installed, for example, the surrounding air. This also causes the temperature of the windings inside motor 2 to become the same as the surrounding air. As a result, when the temperature of the casing of motor 2 is measured, the measured temperature can be considered the temperature of the windings.

[0035] Next, the user presses the start button described above. This starts the winding temperature detecting device 1A. In the control device 50, the CPU 51 shown in Fig. 2 executes a winding temperature detection program, and as a result, the winding temperature detection process flow shown in Fig. 3 is started.

[0036] As shown in FIG. 3, when the flow of the winding temperature detection process starts, first, the control device 50 acquires environmental temperature data from the temperature measuring device 40 (step S1).

[0037] More specifically, as described above, after the temperature measuring device 40 is attached to the casing of the motor 2, the motor 2 is left in the installation environment for a while. As a result, the entire motor 2, including the casing and windings, reaches the temperature of the installation environment. Meanwhile, after startup, the temperature measuring device 40 periodically measures the temperature as described above and transmits the measurement results to the control device 50. The control device 50 regards the pressing of the start button as the moment when the entire motor 2 reaches the temperature of the installation environment, receives the temperature measurement data transmitted after the start button is pressed, and regards the temperature measurement data as temperature data of the installation environment. The control device 50 then regards the acquired temperature data as the initial temperature of the windings of the motor 2 and further stores it in the storage device 54 shown in FIG. 2.

[0038] Next, as shown in FIG. 3, the control device 50 causes the resistance measuring device 20 to measure the resistance of the windings of the motor 2 (step S2).

[0039] In detail, first, the control device 50 controls the electromagnetic contactors 17 and 27 to open the electrical contacts 14-16 and close the electrical contacts 24-26, as shown in FIG. 4. This prevents power from being inadvertently supplied from the power supply device 10 and damage to the resistance measuring device 20. After setting these contacts in this open and closed state, the control device 50 sends a measurement command to the resistance measuring device 20. This causes the control device 50 to measure the resistance of the windings of the motor 2. The control device 50 then receives the measured resistance data from the resistance measuring device 20. The control device 50 stores the received resistance data in the storage device 54 shown in FIG. 2 as the initial resistance value of the windings of the motor 2.

[0040] 3, the control device 50 causes the power supply device 10 to supply power to the motor 2 for a fixed time (step S3). As a result, the control device 50 drives the motor 2 under the test conditions for the winding temperature.

[0041] In detail, the control device 50 first controls the electromagnetic contactors 17 and 27 to close the electrical contacts 14-16 and open the electrical contacts 24-26, as shown in FIG. 1 . Next, the control device 50 sends a start command to the power supply device 10. The power supply start command includes the power value to be supplied. Upon receiving the power supply start command, the power supply device 10 drives the motor 2 at the power value to be supplied. Then, after a time determined by the test conditions for the winding temperature has elapsed, the control device 50 sends a stop command to the power supply device 10. This causes the control device 50 to stop the supply of power to the motor 2 by the power supply device 10. The control device 50 drives the motor 2 under the test conditions for the winding temperature according to this flow.

[0042] Next, as shown in FIG. 3, the control device 50 acquires a measurement value from the power measuring device 30 and determines whether the measurement value of the power measuring device 30 is less than a threshold value (step S4).

[0043] In step S3, the control device 50 sends an end command, which terminates the supply of power from the power supply device 10 to the motor 2. At this time, if the load on the output shaft 3 of the motor 2 is not very large and the inertia is large, the output shaft 3 does not stop immediately but continues to rotate for a while. As a result, back electromotive force is generated in the windings of the motor 2. Meanwhile, as described above, the power meter 30 periodically measures the power of the electric circuit formed by the power supply device 10 and the motor 2 and transmits the measured power data to the control device 50. After sending the end command to the power supply device 10, i.e., after stopping the power supply to the motor 2, the control device 50 receives the measured power data from the power meter 30. The control device 50 treats the power data as back electromotive force data and determines whether the measured value of the power data is less than a threshold value, i.e., whether the measured back electromotive force is less than a threshold value. This determines whether the rotation of the output shaft 3 of the motor 2 has stopped. Here, the threshold value is a value close to zero.

[0044] If the control device 50 determines that the measurement value of the power measuring device 30 is not less than the threshold value (No in step S4), the control device 50 returns to step S4. As a result, the control device 50 performs the determination in step S4 again. The control device 50 repeats step S4 until it determines that the measurement value of the power measuring device 30 is less than the threshold value, that is, until the rotation of the output shaft 3 of the motor 2 stops.

[0045] On the other hand, if the control device 50 determines that the measurement value of the power measuring device 30 is less than the threshold value (Yes in step S4), it treats the output shaft 3 of the motor 2 as having stopped, and then determines whether the waiting time has elapsed (step S5).

[0046] Here, the waiting time refers to the time required to wait until the back electromotive force of the motor 2 becomes smaller than the rated power or power resistance of the resistance measuring device 20. Specifically, the back electromotive force of the motor 2 may exceed the rated power or power resistance of the resistance measuring device 20 even though it is small. The waiting time is a time set in advance through experiments to avoid this situation. For example, the waiting time is 30 seconds. The waiting time is also the time measured after it is determined in step S4 that the measured value of the power measuring device 30 is less than the threshold value. In short, the waiting time refers to the waiting time after the completion of the previous step. Note that, in the case of a motor 2 whose back electromotive force is smaller than the rated power or power resistance of the resistance measuring device 20 at the time of determination in step S4, the waiting time may be zero.

[0047] 2 stores standby time data in advance. The control device 50 reads the standby time data from the storage device 54 and determines, using a timer unit included in the CPU 51, whether the read standby time has elapsed.

[0048] 3, if the control device 50 determines that the waiting time has not elapsed (No in step S5), the process returns to step S5. As a result, the control device 50 performs the determination in step S5 again. The control device 50 repeats step S5 until the waiting time has elapsed.

[0049] On the other hand, if the control device 50 determines that the standby time has elapsed (Yes in step S5), it causes the resistance measuring device 20 to measure the resistance of the windings of the motor 2 and measures the time since the power supply to the motor 2 was stopped (step S6).

[0050] In detail, first, as in step S2, the control device 50 controls the electromagnetic contactors 17 and 27 to open the electrical contacts 14-16 and close the electrical contacts 24-26 shown in FIG. 4 . Next, the control device 50 sends a measurement command to the resistance measuring device 20 to cause the resistance measuring device 20 to measure the resistance of the windings of the motor 2. The control device 50 then receives the measured resistance data from the resistance measuring device 20. Furthermore, the control device 50 causes a timer unit included in the CPU 51 to measure the time since the power supply device 10 stopped supplying power to the motor 2, and obtains the measured time from the timer unit when the control device 50 sends a measurement command to the resistance measuring device 20. In this way, the control device 50 obtains the time required from the power supply device 10 stopping the supply of power to the motor 2 to the resistance measuring device 20 measuring the resistance of the windings of the motor 2. The control device 50 associates the resistance data received from the resistance measuring device 20 with the time data obtained from the timer unit and stores the data in the storage device 54 shown in FIG. 2 . The control device 50 stores this resistance data in the storage device 54 as data on the post-driving resistance of the windings of the motor 2.

[0051] Next, the control device 50 determines whether the resistance has been measured a predetermined number of times (step S7). The number of times the resistance of the windings of the motor 2 has been measured is stored in advance in the storage device 54 shown in Fig. 2 as a condition for the winding temperature test. The number of measurements may be, for example, multiple times, specifically, 10 times. The control device 50 reads out the data on the number of measurements from the storage device 54 and determines whether the number of times the resistance of the windings of the motor 2 has been measured has reached the read number.

[0052] If the control device 50 determines that the resistance has not been measured the predetermined number of times (No in step S7), the process returns to step S5. Then, the control device 50 again determines whether the standby time has elapsed (step S5). Furthermore, if the standby time has elapsed, the control device 50 again causes the resistance measuring device 20 to measure the resistance of the windings of the motor 2, and counts the time since the power supply to the motor 2 was stopped (step S6). As described above, the waiting time is the time from the completion of the previous step, and therefore the waiting time here refers to the time from the determination in step S7.

[0053] On the other hand, if the control device 50 determines that the resistance has been measured the predetermined number of times (Yes in step S7), it estimates the resistance of the windings of the motor 2 when the power supply was stopped (step S8). At this time, it is preferable to control the electromagnetic contactor 27 to open the electrical contacts 24-26. Alternatively, it is preferable to open the electrical contacts 24-26 after step S9, which will be described later.

[0054] In estimating the resistance of the windings of motor 2, the resistance of the windings of motor 2 when power supply was stopped is estimated based on the post-drive resistance value of the windings of motor 2 measured by resistance measuring instrument 20 in step S6 and the time required from when power supply to motor 2 was stopped until resistance measuring instrument 20 measured the resistance of the windings of motor 2. This estimation method will be described with reference to FIG.

[0055] FIG. 5 is a graph showing the change in resistance value of the windings of motor 2. The horizontal axis of the graph shown in FIG. 5 represents the time required from when the power supply to motor 2 was stopped until the resistance of the windings of motor 2 was measured by resistance measuring device 20. The vertical axis of the graph represents the measured resistance value of the windings of motor 2. The graph of FIG. 5 shows the change in the resistance value of the windings of motor 2 when the resistance of the windings of motor 2 was measured 120 seconds after the power supply to motor 2 was stopped, and then measured nine more times every 30 seconds. The dotted line in the graph is the exponential approximation curve, and the mathematical formula in the graph is an expression representing the exponential approximation curve.

[0056] Referring to Figure 5, it can be seen that the resistance of the windings of motor 2 decreases as the time since the power supply was stopped increases. As a result, it can be seen that the resistance of the windings of motor 2 can be approximated by an exponential function, or by a power function. In other words, it can be seen that the resistance of the windings of motor 2 is correlated with the time since the power supply was stopped. Therefore, the control device 50 uses this approximation, that is, the correlation, to determine the resistance of the windings of motor 2 immediately after the power supply to motor 2 is stopped.

[0057] Specifically, the control device 50 reads from the storage device 54 the combined data of the post-drive resistance value of the windings of the motor 2 measured by the resistance measuring device 20 in step S6 and the time required from the cessation of power supply to the motor 2 until the measurement, which is associated with the post-drive resistance value. The control device 50 then performs a regression analysis of the transition in the resistance value of the windings of the motor 2 based on the read data of the winding resistance value of the motor 2 and the time required from the cessation of power supply to the motor 2 until the measurement, which is associated with the read data of the resistance value of the windings of the motor 2. The control device 50 then determines an approximation curve, such as the exponential function or power function described above, and coefficients for specifying the approximation curve. The control device 50 then determines the resistance of the windings of the motor 2 immediately after the cessation of power supply to the motor 2, from the determined approximation curve and the coefficients for specifying the approximation curve. This allows the control device 50 to estimate the resistance of the windings of the motor 2 in step S8.

[0058] Next, the control device 50 calculates the temperature of the windings of the motor 2 when the power supply is stopped (step S9).

[0059] In more detail, if the temperature of the windings of motor 2 before power is supplied, i.e., the initial temperature, measured in step S1 is T0, the resistance of the windings of motor 2 before power is supplied, i.e., the initial resistance, measured in step S2 is R0, and the resistance of the windings of motor 2 immediately after power supply is stopped, estimated in step S8, is R1, then the temperature T1 of the windings of motor 2 immediately after power supply is stopped satisfies the following equation 1 when the windings of motor 2 are made of copper.

[0060]

number

[0061] From this formula 1, the temperature T1 of the windings of the motor 2 immediately after the power supply is stopped can be expressed by formula 2.

[0062]

number

[0063] In step S9, the control device 50 calculates the temperature T1 of the windings of the motor 2 immediately after the power supply is stopped by applying the initial temperature T0, the initial resistance value R0, and the resistance R1 of the windings of the motor 2 estimated in step S8 to equation 2.

[0064] After calculating the temperature T1 of the windings of the motor 2 in step S9, the control device 50 stores the data of the temperature T1 in the storage device 54 shown in FIG. 2. The winding temperature detection device 1A also includes a display device (not shown). The control device 50 outputs the calculation results to the display device for display. This allows the user of the winding temperature detection device 1A to evaluate the suitability of the windings of the motor 2. With this, the control device 50 ends the flow of the winding temperature detection process.

[0065] In this way, the control device 50 can obtain the temperature T1 of the windings of the motor 2 immediately after the power supply is stopped by executing the flow of the winding temperature detection process.

[0066] The initial resistance value of the windings of motor 2 measured by resistance measuring instrument 20 in step S2 described above is an example of the first resistance value referred to in the present disclosure. The resistance value of the windings of motor 2 measured by resistance measuring instrument 20 in step S6 is an example of the second resistance value referred to in the present disclosure. The above-mentioned electric wires 11-13 and 21-23 are an example of the first electric wire and second electric wire referred to in the present disclosure. Equation 2 in step S9 is an example of the relational expression showing the relationship between the resistance of the windings and the environmental temperature referred to in the present disclosure.

[0067] As described above, in the winding temperature detection device 1A according to the first embodiment, the control device 50 measures the time from when the power supply device 10 stops supplying power to when the resistance measuring device 20 measures the resistance of the windings of the motor 2, and estimates the resistance of the windings of the motor 2 when the power supply device 10 stops supplying power based on the correlation between the measured time and the resistance of the windings of the motor 2 measured by the resistance measuring device 20 after the power supply device 10 stops supplying power. Furthermore, the control device 50 applies the estimated resistance, the resistance of the windings of the motor 2 measured by the resistance measuring device 20 before the power supply device 10 started supplying power, and the temperature of the environment in which the motor 2 is installed before the power supply device 10 started supplying power measured by the temperature measuring device 40 to a relational expression that shows the relationship between the resistance of the windings and the temperature of the environment, specifically Equation 2, to determine the temperature of the wires of the motor 2 immediately after the power supply device 10 stopped supplying power. As a result, the winding temperature detection device 1A can more accurately detect the temperature of the windings of the motor 2 when the power supply is stopped, even if there is a time lag between when the power supply device 10 stops supplying power and when the output shaft 3 of the motor 2 actually stops.

[0068] Furthermore, in the winding temperature detecting device 1A, the resistance measuring device 20 measures the resistance of the windings of the motor 2 multiple times after the power supply device 10 stops supplying power. The control device 50 then performs a regression analysis of the transition in the resistance of the windings of the motor 2 after the power supply is stopped, based on each of the multiple resistance values ​​of the motor 2 and the time from when the power supply device 10 stopped supplying power to when each of the resistance values ​​was measured. For example, the control device 50 identifies an approximation curve representing this transition. Therefore, the winding temperature detecting device 1A can easily estimate the resistance of the windings of the motor 2 immediately after the power supply device 10 stopped supplying power. Furthermore, even if the resistance measuring device 20 measures the resistance of the motor 2 windings only a small number of times after the power supply is stopped, the resistance of the motor 2 windings immediately after the power supply is stopped can be more accurately estimated.

[0069] In the winding temperature detection device 1A, after the power supply device 10 stops supplying power, the power measuring device 30 measures the back electromotive force of the windings of the motor 2. Then, the resistance measuring device 20 measures the resistance of the windings of the motor 2 when the back electromotive force measured by the power measuring device 30 is less than a threshold value. Because the winding temperature detection device 1A is not affected by the back electromotive force, it can more accurately measure the resistance of the windings of the motor 2. As a result, it can more accurately detect the temperature of the windings of the motor 2 when the power supply is stopped.

[0070] (Variation) The winding temperature detecting device 1A described in the first embodiment may be used in the manufacturing process of the motor 2. More specifically, the winding temperature detecting device 1A may be used in an inspection process that follows a process of assembling the motor 2 using components such as a rotor and a stator in the manufacturing method of the motor 2. In this case, the motor 2 to be inspected only needs to have windings on at least one of the rotor and the stator. Then, in the inspection process, the winding temperature detecting device 1A may be used to detect the temperature of the windings. In addition, in the inspection process, if the detected winding temperature is within a specified value, the assembled motor 2 may be determined to be a non-defective product.

[0071] Furthermore, when the motor 2 is a compressor provided in an air conditioner or a motor portion incorporated in a blower, the winding temperature detecting device 1A may be used to detect the temperature of the windings of the motor portion. That is, it may be used to inspect the manufactured compressor or blower during the compressor or blower manufacturing process in the air conditioner manufacturing method. Note that the blower referred to here refers to a blower provided in an outdoor unit or indoor unit of the air conditioner.

[0072] (Embodiment 2) In the winding temperature detecting device 1A according to the first embodiment, after the power supply device 10 stops supplying power, the power measuring device 30 measures the back electromotive force of the windings of the motor 2, and the control device 50 waits without proceeding to the next step of the winding temperature detection process until the back electromotive force falls below a threshold value, in other words, until the rotation of the output shaft 3 of the motor 2 stops. However, the winding temperature detecting device 1A is not limited to this. The winding temperature detecting device 1A may also include a mechanism that stops the rotation of the output shaft 3 of the motor 2 after the power supply device 10 stops supplying power.

[0073] A winding temperature detecting device 1B according to the second embodiment includes a brake for stopping rotation of the output shaft 3 of the motor 2. The configuration of the winding temperature detecting device 1B will be described below with reference to Figs. 6 to 8. The configuration of the second embodiment that differs from that of the first embodiment will be mainly described.

[0074] Fig. 6 is a circuit diagram of a winding temperature detecting device 1B according to embodiment 2. Fig. 7 is a circuit diagram when a brake 60 provided in the winding temperature detecting device 1B abuts against the output shaft 3 of the motor 2. Fig. 8 is a circuit diagram when the brake 60 provided in the winding temperature detecting device 1B abuts against the output shaft 3 of the motor 2 and the resistance measuring device 20 measures the resistance of the windings of the motor 2.

[0075] As shown in FIGS. 6 to 8, the winding temperature detecting device 1B includes a brake 60 arranged at a position where it can come into contact with the output shaft 3 of the motor 2 that is the test target for winding temperature.

[0076] The brake 60 includes brake pads and a pressing mechanism (not shown). The brake pads are positioned close to the output shaft 3 of the motor 2 when the electric wires 11-13 are connected to the motor 2 under test and the temperature measuring device 40 is attached to the casing of the motor 2. The pressing mechanism is electrically connected to the control device 50 and presses the brake pads against the output shaft 3 of the motor 2 or releases them in response to commands from the control device 50. This allows the pressing mechanism to brake the rotation of the output shaft 3 or allow it to rotate freely. When braking the rotation of the output shaft 3, the pressing mechanism stops the rotation of the output shaft 3 by applying the brake.

[0077] 6, when the power supply device 10 supplies power to the motor 2 with the electrical contacts 14-16 closed and the electrical contacts 24-26 open, the winding temperature test is a test in which the output shaft 3 of the motor 2 is rotated without applying a load, so the control device 50 sends a release command to the brake 60. When the brake 60 receives this release command, it moves the brake pads away from the output shaft 3 and does not apply any braking force to the output shaft 3.

[0078] 7 has stopped supplying power to the motor 2, the temperature of the windings of the motor 2 immediately after the power supply is stopped can be detected more accurately if the rotation of the output shaft 3 of the motor 2 stops quickly after the power supply is stopped. Therefore, the control device 50 sends a braking command to the brake 60. Upon receiving this braking command, the brake 60 presses the brake pads against the output shaft 3 to brake the output shaft 3.

[0079] Thereafter, when the control device 50 determines that the rotation of the output shaft 3 of the motor 2 has stopped because the back electromotive force measured by the power measuring device 30 falls below the threshold, the control device 50 opens electrical contacts 14-16 and closes electrical contacts 24-26, as shown in FIG. 8. This prevents the resistance measuring device 20 from being affected by the back electromotive force of the windings of the motor 2, enabling it to measure the resistance of the windings of the motor 2. As a result, the winding temperature detection device 1B can more accurately measure the resistance of the windings of the motor 2.

[0080] As described above, the winding temperature detecting device 1B according to the second embodiment includes the brake 60 that is disposed adjacent to the output shaft 3 of the motor 2 and stops the rotation of the output shaft 3. Therefore, after the power supply to the motor 2 is stopped, the rotation of the output shaft 3 is stopped by the brake 60, thereby enabling the resistance of the windings of the motor 2 to be measured quickly. As a result, the winding temperature detecting device 1B can detect the temperature of the windings of the motor 2 in a shorter time immediately after the power supply is stopped. In addition, the temperature can be detected more accurately.

[0081] (Embodiment 3) In the winding temperature detecting device 1B according to the second embodiment, after the power supply device 10 stops supplying power, the brake 60 stops the rotation of the output shaft 3 of the motor 2. However, the mechanism for stopping the rotation of the output shaft 3 of the motor 2 is not limited to the brake 60. The winding temperature detecting device 1B may stop the rotation of the output shaft 3 of the motor 2 by means of an electric circuit.

[0082] A winding temperature detecting device 1C according to the third embodiment has an electric circuit that consumes back electromotive force generated by the rotation of the output shaft 3 of the motor 2. The configuration of the winding temperature detecting device 1C will be described below with reference to Figs. 9 to 11. The description of the third embodiment will focus on the configuration that differs from the first and second embodiments.

[0083] Fig. 9 is a circuit diagram of a winding temperature detecting device 1C according to embodiment 3. Fig. 10 is a circuit diagram when resistors 71-73 included in the winding temperature detecting device 1C are electrically connected to a motor 2. Fig. 11 is a circuit diagram when a resistance measuring device 20 included in the winding temperature detecting device 1C measures the resistance of the windings of the motor 2.

[0084] As shown in FIGS. 9 to 11, the winding temperature detection device 1C includes resistors 71-73 for consuming the back electromotive force of the motor 2 that is the test target for the winding temperature.

[0085] Each of the resistors 71-73 has two terminals. One terminal of each of the resistors 71-73 is connected to the electric wires 11-13 by the electric wires 74-76, respectively. The other terminal is grounded. As a result, the electric potential of the other terminal is 0V.

[0086] Furthermore, each of the electric wires 74-76 is connected to a location of each of the electric wires 11-13 that is closer to the power supply device 10 than the locations P4-P6 to which the electric wires 31-33 are connected. Electromagnetic contactors 77 are provided at these locations to switch between a state in which the power supply device 10 is connected to the locations P4-P6 and a state in which the electric wires 74-76 are connected to the locations P4-P6. The electromagnetic contactors 77 are electrically connected to the control device 50 and perform a switching operation in response to a command from the control device 50. As a result, in the winding temperature detecting device 1C, the electromagnetic contactors 77 can switch between a state in which the motor 2 and the power supply device 10 can be connected and a state in which the motor 2 and the resistors 71-73 can be connected, based on a command from the control device 50.

[0087] 9, when power supply device 10 supplies power to motor 2 with electrical contacts 14-16 closed and electrical contacts 24-26 open, control device 50 transmits a power supply start command to electromagnetic contactor 77. Upon receiving this start command, electromagnetic contactor 77 switches to a state in which power supply device 10 is connected to points P4-P6.

[0088] In contrast, when the power supply device 10 shown in FIG. 10 stops supplying power to the motor 2, as described in the second embodiment, it is desirable for the rotation of the output shaft 3 of the motor 2 to stop promptly after the power supply is stopped. Therefore, the control device 50 sends a command to terminate the power supply to the electromagnetic contactor 77. Upon receiving this command, the electromagnetic contactor 77 switches to a state in which the electric wires 74-76 are connected to the points P4-P6. In other words, the electromagnetic contactor 77 switches to a state in which the motor 2 is connected to the resistors 71-73. As a result, the resistors 71-73 consume the back electromotive force of the windings of the motor 2. This allows the resistors 71-73 to hasten the stopping of the rotation of the output shaft 3 of the motor 2.

[0089] When the control device 50 determines that the rotation of the output shaft 3 of the motor 2 has stopped because the measured value of the back electromotive force of the windings of the motor 2 by the power measuring device 30 falls below the threshold, the control device 50 opens electrical contacts 14-16 and closes electrical contacts 24-26, as shown in FIG. 11. As a result, as in the second embodiment, the resistance measuring device 20 is not affected by the back electromotive force of the windings of the motor 2, and is therefore able to measure the resistance of the windings of the motor 2. As a result, the winding temperature detection device 1C can more accurately measure the resistance of the windings of the motor 2.

[0090] The above-described electric wires 74-76 and electromagnetic contactor 77 are an example of the third electric wire and third contactor defined in the present disclosure.

[0091] As described above, the winding temperature detecting device 1C according to the third embodiment includes resistors 71-73 that are connected to the motor 2 instead of the power supply device 10 by the electromagnetic contactor 77. Therefore, after the power supply to the motor 2 is stopped, the resistors 71-73 are connected to the motor 2, and the resistors 71-73 consume the back electromotive force generated in the windings of the motor 2. As a result, the rotation of the output shaft 3 of the motor 2 stops sooner. This allows the winding temperature detecting device 1C to detect the temperature of the windings of the motor 2 in a shorter time immediately after the power supply is stopped. Furthermore, the detection can be performed more accurately.

[0092] (Fourth embodiment) In winding temperature detecting device 1A-1C according to embodiment 1-3, one of electrical contacts 14-16 and electrical contacts 24-26 is a so-called "a" contact, and the other is a so-called "b" contact. Electrical contacts 14-16 and electrical contacts 24-26 are opened and closed by electromagnetic contactors 17 and 27, respectively. However, in winding temperature detecting device 1A-1C, electrical contacts 14-16 and electrical contacts 24-26 are not limited to this. In winding temperature detecting device 1A-1C, electrical contacts 14-16 and electrical contacts 24-26 may be integrated.

[0093] In a winding temperature detecting device 1D according to embodiment 4, electrical contacts 14-16 and electrical contacts 24-26 are integrated and opened and closed by a single electromagnetic contactor. The configuration of winding temperature detecting device 1D will be described below with reference to Figs. 12 and 13. The description of embodiment 4 will focus on the configuration that differs from embodiments 1-3.

[0094] Fig. 12 is a circuit diagram of a winding temperature detecting device 1D according to embodiment 4. Fig. 13 is a circuit diagram when an electromagnetic contactor 80 provided in the winding temperature detecting device 1D is switched to a state in which the motor 2 and the resistance measuring device 20 are connected. In Fig. 12, the electromagnetic contactor 80 is switched to a state in which the motor 2 and the power supply device 10 are connected.

[0095] As shown in FIG. 12, the winding temperature detection device 1D includes an electromagnetic contactor 80 having a so-called c-contact, i.e., a transfer contact, at the connection portion between each of the electric wires 11-13 extending from the power supply device 10 to the motor 2 and each of the electric wires 21-23 extending from the resistance measuring device 20.

[0096] Electromagnetic contactor 80 is electrically connected to control device 50. Then, in response to a command from control device 50, electromagnetic contactor 80 connects either a terminal on each of electric wires 11-13 extending from power supply device 10 or a terminal on each of electric wires 21-23 extending from resistance measuring device 20 to a common terminal connected to motor 2. This causes electromagnetic contactor 80 to switch between a state in which power supply device 10 and motor 2 are electrically connected as shown in FIG. 12 and a state in which resistance measuring device 20 and motor 2 are electrically connected as shown in FIG. 13. In this way, electromagnetic contactor 80 simplifies the circuit configuration of winding temperature detection device 1D compared to embodiments 1-3.

[0097] The above-described electromagnetic contactor 80 is an example of the fourth contactor referred to in the present disclosure.

[0098] As described above, winding temperature detecting device 1D according to embodiment 4 includes electromagnetic contactor 80 having a c-contact, i.e., a transfer contact, and electromagnetic contactor 80 switches between a state in which power supply device 10 and motor 2 are electrically connected and a state in which resistance measuring device 20 and motor 2 are electrically connected. For this reason, winding temperature detecting device 1D has a simple circuit configuration, and as a result, is easy to manufacture.

[0099] (Embodiment 5) The electromagnetic contactor 80 having the c-contact, ie, the transfer contact, described in the fourth embodiment may be applied to the electromagnetic contactors 17 and 27 described in the first embodiment.

[0100] A winding temperature detecting device 1E according to embodiment 5 includes two electromagnetic contactors having transfer contacts instead of the electromagnetic contactors 17 and 27 described in embodiment 1. The configuration of winding temperature detecting device 1E will be described below with reference to Fig. 14 and Fig. 15. The description of embodiment 5 will focus on the configuration that differs from embodiments 1 to 4.

[0101] Fig. 14 is a circuit diagram of a winding temperature detecting device 1E according to embodiment 5. Fig. 15 is a circuit diagram when an electromagnetic contactor 95 provided in the winding temperature detecting device 1E is switched to a state in which the motor 2 and the resistance measuring device 20 are connected. In Fig. 14, the electromagnetic contactor 91 is switched to a state in which the motor 2 and the power supply device 10 are connected. In Figs. 14 and 15, the power measuring device 30 and the electric wires 31-33 are not shown to facilitate understanding.

[0102] As shown in FIG. 14, a winding temperature detecting device 1E includes electromagnetic contactors 91 and 95 having transfer contacts instead of the electromagnetic contactors 17 and 27 described in the first embodiment.

[0103] The electromagnetic contactor 91 connects either a terminal on each of the electric wires 11-13 extending from the power supply device 10 or a terminal on each of the electric wires 92-94 extending from the control device 50 to a common terminal connected to the motor 2. This causes the electromagnetic contactor 91 to switch between a state in which the power supply device 10 and the motor 2 are electrically connected, as shown in FIG. 14, and a state in which the control device 50 and the motor 2 are electrically connected, as shown in FIG. 15. In the winding temperature detecting device 1E, the control device 50 determines the circuit state of the winding temperature detecting device 1E based on whether or not it is electrically connected to the motor 2. More specifically, the control device 50 is electrically connected to the electromagnetic contactor 91 and controls the switching of the electromagnetic contactor 91 by sending a command to the electromagnetic contactor 91. The control device 50 determines whether or not the switching of the electromagnetic contactor 91 is properly performed based on whether or not it is electrically connected to the motor 2.

[0104] Furthermore, the electromagnetic contactor 95 connects either a terminal on each of the electric wires 21-23 extending from the resistance measuring device 20 or a terminal on each of the electric wires 96-98 extending from the control device 50 to a common terminal on each of the electric wires 11-13, which is connected to points P1-P3 between the electromagnetic contactor 91 and the motor 2. This causes the electromagnetic contactor 95 to switch between a state in which the control device 50 and the motor 2 are electrically connected, as shown in FIG. 14, and a state in which the resistance measuring device 20 and the motor 2 are electrically connected, as shown in FIG. 15. The electromagnetic contactor 95 is also electrically connected to the control device 50, and the control device 50 sends a command to the electromagnetic contactor 95 to control the switching of the electromagnetic contactor 95. The control device 50 determines whether the switching of the electromagnetic contactor 95 is performed properly based on whether the control device 50 is electrically connected to the motor 2.

[0105] The above-described electromagnetic contactors 91 and 95 are examples of the first contactor and second contactor defined in the present disclosure.

[0106] As described above, winding temperature detecting device 1E according to embodiment 5 includes electromagnetic contactors 91 and 95 having transfer contacts. Winding temperature detecting device 1E differs from winding temperature detecting device 1A according to embodiment 1 only in that it includes electromagnetic contactors 91 and 95. As a result, like embodiment 1, winding temperature detecting device 1E can more accurately detect the temperature of the windings of motor 2 when power supply is stopped, even if there is a time lag between when power supply device 10 stops supplying power and when output shaft 3 of motor 2 actually stops.

[0107] The above describes the motor 2 winding temperature detection device 1A-1E, motor 2 winding temperature detection method, motor 2 manufacturing method, air conditioner manufacturing method, and program according to the embodiments of the present disclosure, but the motor 2 winding temperature detection device 1A-1E, motor 2 winding temperature detection method, motor 2 manufacturing method, air conditioner manufacturing method, and program are not limited to these.

[0108] For example, in the first to fifth embodiments, the winding temperature of a motor 2 is detected, which is incorporated into a compressor of an air conditioner and includes a stator having a three-phase winding and a rotor having a permanent magnet. However, the motor 2 to be detected is not limited to this. The winding temperature detecting devices 1A-1E are applicable to all motors having windings. Therefore, the motor 2 may be, for example, a two-phase type or a four-phase type.

[0109] Furthermore, in embodiments 1-5, the control device 50 determines whether the output shaft 3 of the motor 2 is rotating after the power supply device 10 stops the power supply based on the magnitude of the back electromotive force of the windings of the motor 2 measured by the power measuring device 30. However, the control device 50 is not limited to this. The winding temperature detection device 1A-1E may include a voltage measuring device that measures the back electromotive force of the windings of the motor 2, and the control device 50 may determine whether the output shaft 3 of the motor 2 is rotating based on the magnitude of the back electromotive force of the windings of the motor 2 measured by the voltage measuring device. Alternatively, the winding temperature detection device 1A-1E may include a current measuring device that measures the back electromotive force of the windings of the motor 2, and the control device 50 may determine whether the output shaft 3 of the motor 2 is rotating based on the magnitude of the back electromotive force of the windings of the motor 2 measured by the current measuring device.

[0110] Furthermore, in the first to fifth embodiments, the devices are referred to as winding temperature detecting devices 1A-1E, but these devices may include what is called a unit or a system.

[0111] As described above, the motor 2 winding temperature detection devices 1A-1E, the motor 2 winding temperature detection method, the motor 2 manufacturing method, the air conditioner manufacturing method, and the program are not limited to the above-described embodiments, and various modifications and substitutions can be made. Various embodiments of the present disclosure are described below as appendices.

[0112] (Appendix 1) a power supply device that supplies power to the motor to drive the motor; a resistance measuring device that measures the resistance of a winding of the motor to obtain a first resistance value before the power supply device starts supplying power, and that measures the resistance of the winding after the power supply device stops supplying power and the motor has stopped rotating to obtain a second resistance value; a temperature measuring device that measures the temperature of an environment in which the motor is installed when the resistance measuring device measures the resistance of the winding and obtains the first resistance value; a control device that measures the time from when the power supply device stops supplying power until the resistance measuring device measures the resistance of the winding and obtains the second resistance value, estimates the resistance value of the winding when the power supply device stops supplying power based on the correlation between the measured time and the second resistance value obtained by the resistance measuring device, and further applies the estimated resistance value, the first resistance value obtained by the resistance measuring device, and the value of the temperature of the environment measured by the temperature measuring device to a relational expression that indicates the relationship between the resistance of the winding and the temperature of the environment, thereby determining the temperature of the winding when the power supply device stops supplying power; Equipped with Motor winding temperature detection device. (Appendix 2) the resistance measuring device measures the resistance of the winding a plurality of times after the power supply device stops supplying the power and the rotation of the motor stops, thereby obtaining a plurality of the second resistance values; the control device measures the time until each of the plurality of second resistance values ​​is acquired, and estimates the resistance value of the winding when the power supply device stops supplying the power by performing a regression analysis on a transition in the resistance value of the winding from the time when the power supply device stops supplying the power, based on each of the measured times and each of the second resistance values ​​acquired by the resistance measuring device. 2. A motor winding temperature detection device according to claim 1. (Appendix 3) a first contactor provided on a first electric wire connecting the power supply device and the motor, the first contactor switching the power supply device and the motor between an electrically connected state and an electrically disconnected state; a second contactor provided on a second electric wire that branches off from the first electric wire between the first contactor and the motor and is connected to the resistance measuring device, the second contactor switching the motor and the resistance measuring device between an electrically connected state and an electrically disconnected state; Furthermore, the resistance measuring device measures the resistance of the winding to obtain the first resistance value or the second resistance value when the first contactor electrically disconnects the power supply device from the motor and the second contactor electrically connects the motor to the resistance measuring device; 3. A motor winding temperature detection device according to claim 1 or 2. (Appendix 4) the first contactor transmits an electrical connection state between the power supply device and the motor to the control device; The second contactor transmits an electrical connection state between the motor and the resistance measuring device to the control device. 4. A motor winding temperature detection device according to claim 3. (Appendix 5) a power measuring device for measuring the back electromotive force of the winding from when the power supply device stops supplying the power; the control device determines that rotation of the motor has stopped when the value of the back electromotive force measured by the power measuring device is less than a threshold value; the resistance measuring device measures the resistance of the winding to obtain the second resistance value when the control device determines that the rotation of the motor has stopped. 5. A motor winding temperature detection device according to any one of appendices 1 to 4. (Appendix 6) a brake for stopping rotation of an output shaft of the motor; the brake stops the rotation of the output shaft after the power supply device stops supplying the power; the resistance measuring device measures the resistance of the winding when the brake stops the rotation of the output shaft to obtain the second resistance value. 6. A motor winding temperature detection device according to claim 5. (Appendix 7) A resistor; a third contactor that is provided at a branch point where a third electric wire connected to the resistor branches from a first electric wire that connects the power supply device and the motor, and that switches between a state in which the power supply device and the motor are electrically connected and a state in which the resistor and the motor are electrically connected; Furthermore, the third contactor is switched to a state in which the power supply device and the motor are electrically connected before the power supply device starts supplying the power, and is switched to a state in which the resistor and the motor are electrically connected after the power supply device stops supplying the power; the resistance measuring device measures the resistance of the winding to obtain the second resistance value after the third contactor switches to a state where the resistor and the motor are electrically connected and when the value of the back electromotive force measured by the power measuring device is less than a threshold value; 6. A motor winding temperature detection device according to claim 5. (Appendix 8) a fourth contactor that selectively connects a first electric wire connected to the power supply device or a second electric wire connected to the resistance measuring device to the motor, thereby switching between a state in which the power supply device and the motor are electrically connected and a state in which the resistance measuring device and the motor are electrically connected; 8. A motor winding temperature detection device according to any one of appendices 1 to 7. (Appendix 9) Before starting to supply power to the motor, measuring the resistance of a winding of the motor to obtain a first resistance value and obtaining a temperature of an environment in which the motor is installed; After obtaining the first resistance value and the temperature of the environment, supplying the power to the motor to drive the motor; measuring the resistance of the winding after the supply of power to the motor is stopped and the motor has stopped rotating to obtain a second resistance value; estimating the resistance value of the winding when the supply of power to the motor is stopped based on a correlation between the time required from when the supply of power to the motor is stopped to when the resistance of the winding is measured and the second resistance value is obtained, and the second resistance value; applying the estimated resistance value of the winding, the first resistance value, and the temperature of the environment to a relational expression that indicates a relationship between the resistance of the winding and the temperature of the environment, to obtain the temperature of the winding when the supply of power to the motor is stopped; Equipped with A method for detecting motor winding temperature. (Appendix 10) Assembling a motor using a rotor and a stator, one of which has at least a winding; determining a temperature of the windings when the supply of power to the assembled motor is stopped using the motor winding temperature detection method described in Supplementary Note 9, and determining the motor as a non-defective product if the determined temperature of the windings is within a specified value; A method for manufacturing a motor comprising: (Appendix 11) manufacturing a motor to be provided in a compressor by the motor manufacturing method described in Appendix 10; assembling an air conditioner using the compressor; Equipped with A method for manufacturing an air conditioner. (Appendix 12) manufacturing a motor to be provided in a blower by the motor manufacturing method described in Appendix 10; assembling an air conditioner using the blower; Equipped with A method for manufacturing an air conditioner. (Appendix 13) a power supply device that supplies power to the motor to drive the motor; a resistance measuring device for measuring the resistance of a winding of the motor; a temperature measuring device for measuring the temperature of the environment in which the motor is installed; A program for controlling the motor winding temperature detection device, comprising: On the computer, Before the power supply device starts supplying the power, the resistance measuring device measures the resistance of the winding to obtain a first resistance value, and the temperature measuring device obtains data on the temperature of the environment; After acquiring the data of the first resistance value and the temperature of the environment, causing the power supply device to supply power to the motor to drive the motor; After the power supply device stops supplying power and the motor stops rotating, having the resistance meter measure the resistance of the winding to obtain a second resistance value; estimating the resistance value of the winding when the power supply device stopped supplying the power based on a correlation between the time required from when the power supply device stopped supplying the power to when the resistance measuring device measures the resistance of the winding and acquires the second resistance value and the second resistance value; a step of applying the estimated resistance value, the first resistance value, and the temperature of the environment measured by the temperature measuring device to a relational expression that indicates a relationship between the resistance of the winding and the temperature of the environment, thereby determining the temperature of the winding when the power supply device stops supplying the power; A program to execute. [Explanation of symbols]

[0113] 1A-1E Winding temperature detection device, 2 Motor, 3 Output shaft, 10 Power supply device, 11-13 Electric wire, 14-16 Electric contact, 17 Electromagnetic contactor, 20 Resistance measuring device, 21-23 Electric wire, 24-26 Electric contact, 27 Electromagnetic contactor, 30 Power measuring device, 31-33 Electric wire, 40 Temperature measuring device, 50 Control device, 51 CPU, 52 ROM, 53 RAM, 54 Storage device, 55 I / O port, 60 Brake, 71-73 Resistor, 74-76 Electric wire, 77 Electromagnetic contactor, 80 Electromagnetic contactor, 91 Electromagnetic contactor, 92-94 Electric wire, 95 Electromagnetic contactor, 96-98 Electric wire, 541 Winding temperature calculation data, P1-P6 locations.

Claims

1. a power supply device that supplies power to the motor to drive the motor; a resistance measuring device that measures the resistance of a winding of the motor to obtain a first resistance value before the power supply device starts supplying power, and that measures the resistance of the winding after the power supply device stops supplying power and the motor has stopped rotating to obtain a second resistance value; a temperature measuring device that measures the temperature of an environment in which the motor is installed when the resistance measuring device measures the resistance of the winding and obtains the first resistance value; a control device that measures the time from when the power supply device stops supplying power until the resistance measuring device measures the resistance of the winding and obtains the second resistance value, estimates the resistance value of the winding when the power supply device stops supplying power based on the correlation between the measured time and the second resistance value obtained by the resistance measuring device, and further applies the estimated resistance value, the first resistance value obtained by the resistance measuring device, and the value of the temperature of the environment measured by the temperature measuring device to a relational expression that indicates the relationship between the resistance of the winding and the temperature of the environment, thereby determining the temperature of the winding when the power supply device stops supplying power; Equipped with Motor winding temperature detection device.

2. the resistance measuring device measures the resistance of the winding a plurality of times after the power supply device stops supplying the power and the rotation of the motor stops, thereby obtaining a plurality of the second resistance values; the control device measures the time until each of the plurality of second resistance values ​​is acquired, and estimates the resistance value of the winding when the power supply device stops supplying the power by performing a regression analysis on a transition in the resistance value of the winding from the time when the power supply device stops supplying the power, based on each of the measured times and each of the second resistance values ​​acquired by the resistance measuring device.

2. The motor winding temperature detection device according to claim 1.

3. a first contactor provided on a first electric wire connecting the power supply device and the motor, the first contactor switching the power supply device and the motor between an electrically connected state and an electrically disconnected state; a second contactor provided on a second electric wire that branches off from the first electric wire between the first contactor and the motor and is connected to the resistance measuring device, the second contactor switching the motor and the resistance measuring device between an electrically connected state and an electrically disconnected state; Furthermore, the resistance measuring device measures the resistance of the winding to obtain the first resistance value or the second resistance value when the first contactor electrically disconnects the power supply device from the motor and the second contactor electrically connects the motor to the resistance measuring device; 3. The motor winding temperature detection device according to claim 1 or 2.

4. the first contactor transmits an electrical connection state between the power supply device and the motor to the control device; the second contactor transmits an electrical connection state between the motor and the resistance measuring device to the control device; 4. The motor winding temperature detection device according to claim 3.

5. a power measuring device for measuring the back electromotive force of the winding from when the power supply device stops supplying the power; the control device determines that rotation of the motor has stopped when the value of the back electromotive force measured by the power measuring device is less than a threshold value; the resistance measuring device measures the resistance of the winding to obtain the second resistance value when the control device determines that the rotation of the motor has stopped.

3. The motor winding temperature detection device according to claim 1 or 2.

6. a brake for stopping rotation of an output shaft of the motor; the brake stops the rotation of the output shaft after the power supply device stops supplying the power; the resistance measuring device measures the resistance of the winding when the brake stops the rotation of the output shaft to obtain the second resistance value.

6. The motor winding temperature detection device according to claim 5.

7. A resistor; a third contactor provided at a branching point where a third electric wire connected to the resistor branches from a first electric wire connecting the power supply device and the motor, the third contactor switching between a state where the power supply device and the motor are electrically connected and a state where the resistor and the motor are electrically connected; Furthermore, the third contactor is switched to a state in which the power supply device and the motor are electrically connected before the power supply device starts supplying the power, and is switched to a state in which the resistor and the motor are electrically connected after the power supply device stops supplying the power; the resistance measuring device measures the resistance of the winding to obtain the second resistance value after the third contactor switches to a state where the resistor and the motor are electrically connected and when the value of the back electromotive force measured by the power measuring device is less than a threshold value; 6. The motor winding temperature detection device according to claim 5.

8. a fourth contactor that selectively connects the first electric wire connected to the power supply device or the second electric wire connected to the resistance measuring device to the motor, thereby switching between a state in which the power supply device and the motor are electrically connected and a state in which the resistance measuring device and the motor are electrically connected; 3. The motor winding temperature detection device according to claim 1 or 2.

9. Before starting to supply power to the motor, measuring the resistance of a winding of the motor to obtain a first resistance value and obtaining a temperature of an environment in which the motor is installed; After obtaining the first resistance value and the temperature of the environment, supplying the power to the motor to drive the motor; measuring the resistance of the winding after the supply of power to the motor is stopped and the motor has stopped rotating to obtain a second resistance value; estimating the resistance value of the winding when the supply of power to the motor is stopped based on a correlation between the time required from when the supply of power to the motor is stopped to when the resistance of the winding is measured and the second resistance value is obtained, and the second resistance value; applying the estimated resistance value of the winding, the first resistance value, and the temperature of the environment to a relational expression that indicates a relationship between the resistance of the winding and the temperature of the environment, to obtain a temperature of the winding when the supply of power to the motor is stopped; Equipped with A method for detecting motor winding temperature.

10. Assembling a motor using a rotor and a stator, one of which has at least a winding; a step of determining a temperature of the windings when the supply of power to the assembled motor is stopped using the motor winding temperature detection method according to claim 9, and determining that the motor is a non-defective product if the determined temperature of the windings is within a specified value; A method for manufacturing a motor comprising:

11. a step of manufacturing the motor to be provided in a compressor by the motor manufacturing method according to claim 10; assembling an air conditioner using the compressor; Equipped with A method for manufacturing an air conditioner.

12. a step of manufacturing the motor to be provided in a blower by the motor manufacturing method according to claim 10; assembling an air conditioner using the blower; Equipped with A method for manufacturing an air conditioner.

13. a power supply device that supplies power to the motor to drive the motor; a resistance measuring device for measuring the resistance of a winding of the motor; a temperature measuring device for measuring the temperature of the environment in which the motor is installed; A program for controlling the motor winding temperature detection device, comprising: On the computer, Before the power supply device starts supplying the power, the resistance measuring device measures the resistance of the winding to obtain a first resistance value, and the temperature measuring device obtains data on the temperature of the environment; After acquiring the data of the first resistance value and the temperature of the environment, causing the power supply device to supply power to the motor to drive the motor; after the power supply device stops supplying power and the motor stops rotating, having the resistance meter measure the resistance of the winding to obtain a second resistance value; estimating the resistance value of the winding when the power supply device stopped supplying the power based on a correlation between the time required from when the power supply device stopped supplying the power to when the resistance measuring device measures the resistance of the winding and acquires the second resistance value and the second resistance value; a step of applying the estimated resistance value, the first resistance value, and the temperature of the environment measured by the temperature measuring device to a relational expression that indicates a relationship between the resistance of the winding and the temperature of the environment, thereby determining the temperature of the winding when the power supply device stops supplying the power; A program to execute.

Images