Motor evaluation index presentation device, motor output evaluation system, and motor evaluation index presentation method

Abstract

The present invention provides an electric motor evaluation index display device that can evaluate the margin of output of an electric motor using a simple structure and method. [Solution] The system includes an output measuring instrument 2 for measuring the output of the electric motor 210 or the output of the vehicle 200 equipped with the electric motor 210, and / or a temperature measuring instrument 1 for measuring the surface temperature of the electric motor 210, and a margin data generator 3a for generating and outputting margin determination data for determining the magnitude of the margin of a predetermined output to be evaluated in the electric motor 210. After driving the electric motor 210 for a predetermined time in an output range including the output to be evaluated, the margin data generator 3a generates data on the decrease in the output of the electric motor 210 or the output of the vehicle 200 equipped with the electric motor 210 as margin determination data if the output measuring instrument 2 is provided, and generates data on the surface temperature of the electric motor 210 as margin determination data if the temperature measuring instrument 1 is provided.

Description

Technical Field

[0001] The present invention relates to an electric motor evaluation index presentation device that presents an evaluation index for evaluating the output of an electric motor mounted on a vehicle, an electric motor output evaluation system including the same, and an electric motor evaluation index presentation method.

Background Art

[0002] In recent years, as new means of transportation, small electric mobility such as electric kick scooters, mini cars, and electric bicycles has attracted attention. Since this type of transportation means is small, it is maneuverable, and since it is electric, its environmental performance is extremely high, and further spread is expected in the future.

[0003] Here, there is a "rated output" for the electric motor mounted on the electric mobility. Since this rated output is an index indicating whether it can withstand use for the required work, for example, as shown in Non-Patent Document 1, there is a rated output test for determining whether the electric motor has an output performance equal to or higher than the work rate to be nominal.

Prior Art Documents

Patent Documents

[0004]

Non-Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In practice, there are cases where regulations impose restrictions requiring the rated output of an electric motor to be below a certain level. Specifically, this is the case when trying to register the aforementioned small electric mobility devices in a specific vehicle category. For example, when registering in the category of a specific small motorized bicycle, the rated output of the electric motor must be kept below 600W.

[0006] Here, the rated output is a value that can be freely determined by the motor manufacturer, etc., so even if a vehicle is equipped with a motor that has an excessive margin over the rated output required by the system as described above, it may be possible to register it in the designated category (for example, the category of a specific small motorized bicycle). In this case, the original purpose of the system, which is to "exclude the registration of vehicles equipped with motors that have performance substantially exceeding the rated output," cannot be achieved.

[0007] However, as mentioned above, rated output is originally an indicator of whether or not the motor's output has a certain level of capability. Therefore, from the perspective of reducing the manufacturing cost of motors, it is unlikely that manufacturers would deliberately manufacture motors with output characteristics that have an excessive margin over the rated output specified for the vehicle in which the motor will be installed. It is presumed that there is a motivation to keep this output margin as small as possible, and therefore, conventionally, there has not been much need to evaluate the output margin of a motor. While tests such as the one shown in Non-Patent Document 1 exist, a test method for evaluating the output margin had not been established.

[0008] The present invention has been made in view of the above problems, and provides an electric motor evaluation index presentation device, an electric motor output evaluation system, and an electric motor evaluation index presentation method that can evaluate the margin of output of an electric motor with a simple structure and method. [Means for solving the problem]

[0009] An electric motor evaluation index presentation device according to one aspect of the present invention is an electric motor evaluation index presentation device that presents an evaluation index for evaluating the output of an electric motor mounted on a vehicle (hereinafter referred to as the target output), comprising: an output measuring instrument for measuring the output of the electric motor or the output of the vehicle on which the electric motor is mounted, and / or a temperature measuring instrument for measuring the surface temperature of the electric motor; and a margin data generator for generating and outputting margin determination data for determining the magnitude of the margin of the electric motor with respect to the target output, wherein after the electric motor has been driven for a predetermined time (hereinafter referred to as the test time) in the output region including the target output, the margin data generator generates data of the decrease in the output of the electric motor or the output of the vehicle on which the electric motor is mounted as the margin determination data if the output measuring instrument is provided, and generates data of the surface temperature of the electric motor as the margin determination data if the temperature measuring instrument is provided.

[0010] Furthermore, an electric motor output evaluation system according to one aspect of the present invention is an electric motor output evaluation system for evaluating the output of an electric motor mounted on a vehicle (hereinafter referred to as the output to be evaluated), comprising the above-mentioned electric motor evaluation index presentation device and a margin determination device for determining the magnitude of the margin, wherein the electric motor evaluation index presentation device has the output measuring instrument, and the margin determination device has a margin data acquisition unit for acquiring the margin determination data and a determination unit that, referring to the margin determination data, determines that the margin is large when the amount of decrease in output of the electric motor or the vehicle on which the electric motor is mounted is less than a predetermined threshold (hereinafter referred to as the output threshold), and determines that the margin is small when the amount of decrease in output of the electric motor or the vehicle on which the electric motor is mounted is equal to or greater than the output threshold.

[0011] Another aspect of the present invention relates to an electric motor output evaluation system for evaluating the output of an electric motor mounted on a vehicle (hereinafter referred to as the output to be evaluated), comprising: an electric motor evaluation index presentation device; and a margin determination device for determining the magnitude of the margin, wherein the electric motor evaluation index presentation device has the temperature measuring instrument; and the margin determination device has a margin data acquisition unit for acquiring margin determination data; and a determination unit that refers to the margin determination data and determines that the margin is large when the surface temperature of the electric motor is less than a predetermined threshold (hereinafter referred to as the temperature threshold), and that the margin is small when the surface temperature of the electric motor is equal to or greater than the temperature threshold.

[0012] Furthermore, the above-described motor output evaluation system may also include a stop instruction unit that, before the test time has elapsed, determines that the margin is small if the amount of decrease in the output of the motor or the vehicle on which the motor is mounted is equal to or greater than the output threshold, and instructs the motor to stop driving.

[0013] Furthermore, the above-described motor output evaluation system may also include a stop instruction unit that, before the test time has elapsed, determines that the margin is small if the surface temperature of the motor is above a predetermined threshold (hereinafter referred to as the temperature threshold) and instructs the motor to stop driving.

[0014] Furthermore, the above-described motor output evaluation system may further include a running test device for running the vehicle, the output measuring instrument is configured to measure the output of the vehicle, and the margin determination data may be data on the amount of decrease in the output of the vehicle when a running test is performed by the running test device in which the vehicle is run for the test period at a speed that exhibits the output to be evaluated (hereinafter referred to as the evaluation output corresponding speed).

[0015] Furthermore, the above-described motor output evaluation system may further include a running test device for running the vehicle, and the margin determination data may be data of the surface temperature of the motor when the running test device runs the vehicle at a speed that exhibits the output to be evaluated (hereinafter referred to as the evaluation output corresponding speed) for the test period.

[0016] Furthermore, in the above-described motor output evaluation system, in the running test, the vehicle may be run at the first speed and the second speed, with the lower speed among the evaluation output corresponding speeds being designated as the first speed and the higher speed as the second speed.

[0017] Furthermore, in the above-described motor output evaluation system, the running test may include a first test stage in which the vehicle is driven at the second speed for a predetermined time, a second test stage in which the vehicle is driven at the second speed for a predetermined time after the vehicle has been driven at the first speed for a predetermined time, and a third test stage in which the vehicle is driven at the first speed for a predetermined time.

[0018] Furthermore, in the above-described motor output evaluation system, the second test stage may include multiple stages in which the running time of the vehicle at the first speed gradually increases.

[0019] Furthermore, in the above-described motor output evaluation system, the running test may alternate between testing at the speed corresponding to the evaluation output and testing at a third speed lower than the speed corresponding to the evaluation output.

[0020] Furthermore, in the above-described motor output evaluation system, in the running test, the evaluation output corresponding speed has a first speed on the low-speed side and a second speed on the high-speed side, and the third speed may be a speed between the first speed and the second speed.

[0021] Furthermore, in the above-described motor output evaluation system, the test of the third speed may be performed multiple times during the running test, and the third speed may be gradually reduced with each test.

[0022] The motor output evaluation system may further include a speed calculation device for calculating the evaluation output-corresponding speed used in the running test, and the speed calculation device may include: a vehicle speed-rotation speed characteristic input unit for inputting a vehicle speed-rotation speed characteristic that shows the relationship between the vehicle's running speed and the motor's rotation speed obtained by running the vehicle with the running test device; a motor output-rotation speed characteristic input unit for inputting a motor output-rotation speed characteristic that shows the relationship between the motor's output and the motor's rotation speed obtained in advance; a motor output-vehicle speed characteristic generation unit for generating a motor output-vehicle speed characteristic that shows the relationship between the motor's output and the vehicle's running speed from the vehicle speed-rotation speed characteristic and the motor output-rotation speed characteristic; and a speed calculation unit for calculating the evaluation output-corresponding speed from the motor output-vehicle speed characteristic.

[0023] The motor output evaluation system may further include a speed calculation device for calculating the evaluation output-corresponding speed used in the running test, and the speed calculation device may include a vehicle output-vehicle speed characteristic input unit for inputting a vehicle output-vehicle speed characteristic that shows the relationship between the output of the vehicle obtained by running the vehicle with the running test device and the running speed of the vehicle, a loss correction unit for calculating the motor output-vehicle speed characteristic by performing a correction on the vehicle output-vehicle speed characteristic based on the drive loss in the vehicle, and a speed calculation unit for calculating the evaluation output-corresponding speed from the motor output-vehicle speed characteristic.

[0024] Furthermore, the above-described motor output evaluation system may also include a test non-execution instruction unit that, when the maximum output of the motor is less than or equal to the output to be evaluated, determines that the margin is small and instructs the system not to perform the running test.

[0025] Furthermore, an electric motor evaluation index presentation method according to one aspect of the present invention is an electric motor evaluation index presentation method for presenting an evaluation index for evaluating the output of an electric motor mounted on a vehicle (hereinafter referred to as the target output), comprising: an output measurement step for measuring the output of the electric motor or the output of the vehicle on which the electric motor is mounted, and / or a temperature measurement step for measuring the surface temperature of the electric motor; and a margin data generation step for generating and outputting margin determination data for determining the magnitude of the margin of the electric motor with respect to the target output, wherein after driving the electric motor in an output region including the target output for a predetermined time (hereinafter referred to as the test time), in the margin data generation step, if the output measuring instrument is provided, data of the decrease in the output of the electric motor or the output of the vehicle on which the electric motor is mounted is generated as the margin determination data, and if the temperature measuring instrument is provided, data of the surface temperature of the electric motor is generated as the margin determination data. [Effects of the Invention]

[0026] According to the above-described motor evaluation index presentation device, motor output evaluation system, and motor evaluation index presentation method, it is possible to evaluate the margin of output of a motor with a simple structure and method. [Brief explanation of the drawing]

[0027] [Figure 1] This is a side view showing the overall configuration of an electric motor output evaluation system according to an embodiment of the present invention. [Figure 2] This is a functional block diagram of the margin determination device of the above evaluation system. [Figure 3] This graph shows the relationship between the vehicle's speed and the vehicle's (or the motor's) output. [Figure 4] This is a functional block diagram of the velocity calculation device of the evaluation system described above. [Figure 5] This flowchart shows a method for evaluating the output of an electric motor using the evaluation system described above. [Figure 6]This graph shows the results of an output evaluation of an electric motor, illustrating the effectiveness of the evaluation system described above. [Figure 7] This figure shows the conditions and procedure for the driving test in the first modified example of the evaluation system described above. [Figure 8] This figure shows the conditions and procedure for the driving test in the first example of the second modified version of the evaluation system described above. [Figure 9] This graph shows the results of a driving test in the first example of the second modification of the evaluation system described above. [Figure 10] This figure shows the conditions and procedure for the driving test in the second example of the second modified version of the evaluation system described above. [Figure 11] This is a functional block diagram of the velocity calculation device in the third modified example of the evaluation system described above. [Figure 12] This diagram provides a schematic overview of the second pre-running test conducted in the third modified version of the evaluation system, showing only the essential parts. [Figure 13] This flowchart shows a method for evaluating the output of an electric motor using a third modified version of the evaluation system. [Modes for carrying out the invention]

[0028] Hereinafter, the motor output evaluation system 100 according to the first embodiment of the present invention will be described with reference to the attached drawings.

[0029] <Overall Structure> The motor output evaluation system (hereinafter referred to as the evaluation system) 100 is a device for evaluating the output of a motor 210 mounted on a vehicle 200. The vehicle 200 referred to here is assumed to be a small electric mobility device such as an electric kick scooter, but is not particularly limited to such devices. In this embodiment, as an example, the output of the motor 210 to be evaluated by the evaluation system 100 (the output to be evaluated) is assumed to be the "rated output" nominally stated by the motor 210 manufacturer, but the output to be evaluated of the motor 210 is not particularly limited and can be set in various ways.

[0030] As shown in Figure 1, the evaluation system 100 includes a temperature measuring device 1 that measures the surface temperature Ts of the electric motor 210 while it is mounted on the vehicle 200, an output measuring device 2 that measures the output Pc of the vehicle 200, a margin determination device 3 electrically connected to the temperature measuring device 1 and the output measuring device 2, a running test device 4 that runs the vehicle 200 equipped with the electric motor 210, and a speed calculation device 5 that calculates the data necessary when conducting a running test using the running test device 4.

[0031] The temperature measuring device 1 includes, for example, a thermographic camera and is positioned opposite the electric motor 210 to continuously measure the surface temperature Ts of the electric motor 210. In this embodiment, the temperature measuring device 1 identifies the part of the surface of the electric motor 210 that becomes the hottest (the hottest part) while the vehicle 200 is running, and continuously measures the temperature change of this part.

[0032] The output measuring device 2 is installed in the running test device 4, which will be described in detail later, and is designed to continuously measure the output Pc of the vehicle 200.

[0033] The running test device 4 is, for example, a chassis dynamometer and has a roller 40 that the tires 220 of a vehicle 200 equipped with an electric motor 210 make contact with, and a measuring electric motor 41 connected to the roller 40 that functions as a dynamo (load regulator), and applies a load to the tires 220 that is the same as the load that is applied to the tires 220 when the vehicle 200 is actually running. As described above, the running test device 4 is equipped with an output measuring device 2, and the output of the vehicle 200 is measured in the running test device 4 from the load applied to the tires 220 (regenerative power of the measuring electric motor 41, etc.).

[0034] The margin determination device 3 determines the magnitude of the margin relative to the rated output Pr of the electric motor 210 when the electric motor 210 is driven for a predetermined time (hereinafter referred to as the test time t) during a running test in which the vehicle 200 is driven for the test time t, and is implemented by a computer COM including a processor. The margin determination device 3 is also equipped with a margin data generator 3a, which is similarly implemented by the computer COM, and after the electric motor 210 has been driven for the test time t in the output range including the rated output Pr, that is, after the running test device 4 has performed a running test in which the vehicle 200 is driven at a speed that exhibits the rated output Pr (hereinafter referred to as the evaluation output corresponding speed) for the test time t, it generates data on the amount of decrease in the output Pc of the vehicle 200 as margin determination data. The margin determination device 3 includes, as shown in Figure 2, a temperature data acquisition unit 30 that acquires data on the surface temperature Ts of the electric motor 210, an output data acquisition unit (margin determination data acquisition unit) 31 that acquires data on the decrease in the output Pc of the vehicle 200 (margin determination data), a determination unit 32 that refers to the data on the decrease in the output Pc of the vehicle 200 and determines the margin of the electric motor 210 relative to its rated output Pr, a stop instruction unit 33 that instructs the electric motor 210 to stop driving under predetermined conditions described later before the test time t has elapsed, and a test non-execution instruction unit 34 that instructs the driving test not to be performed under predetermined conditions described later before the start of the driving test.

[0035] The temperature data acquisition unit 30 continuously acquires data of the surface temperature Ts of the electric motor 210, as measured by the temperature measuring instrument 1. The output data acquisition unit 31 continuously acquires data of the output Pc of the vehicle 200 measured by the output measuring instrument 2, and also acquires margin determination data which is data on the amount of decrease in output Pc.

[0036] The determination unit 32 determines the margin of the electric motor 210 relative to its rated output Pr, based on the amount of decrease in the vehicle's output Pc obtained from the margin data generator 3a.

[0037] Incidentally, the relationship between the vehicle 200's running speed V and the vehicle 200's output Pc (or the output Pm of the electric motor 210 alone) is generally as shown in Figure 3, where the output gradually increases from the low-speed range to the maximum output, and then decreases again in the high-speed range. Therefore, if the rated output Pr is, for example, 600W, the speed at which the vehicle 200 exhibits this rated output Pr, i.e., the speed corresponding to the evaluation output, is the first speed V on the low-speed side. min And the second speed V on the high-speed side max And may exist. In this embodiment, these first velocity V min and second velocity V max This is calculated by the velocity calculation device 5, which will be described later.

[0038] The rated output Pr of the electric motor 210 matches the upper limit of the output of the electric motor 210 required by the regulations. For example, if the vehicle 200 is a specified small motorized bicycle, the rated output Pr will be 600 [W]. However, since the vehicle 200 is equipped with a power transmission mechanism and a control device (ECU: Electronic Control Unit), as shown in Figure 3, there is a difference between the output Pc of the vehicle 200 and the output Pm of the electric motor 210 alone, and these outputs Pc of the vehicle 200 and Pm of the electric motor 210 do not necessarily match. For this reason, in this embodiment, the first speed V is directly obtained from the output Pc of the vehicle 200 measured by the output measuring instrument 2. min and second velocity V max Since it is not possible to calculate this, a velocity calculation device 5, which will be described in detail later, is provided.

[0039] The determination unit 32 determines that the margin relative to the rated output Pr is large if the decrease in the output Pc of the vehicle 200 at the end of the driving test is less than a predetermined threshold (hereinafter referred to as the output threshold Pth), and that the margin is small if the decrease in the output Pc of the vehicle 200 is equal to or greater than the output threshold Pth. Specifically, for example, if the decrease in the output Pr of the vehicle 200 from the start to the end of the driving test is less than 4%, it is determined that the margin relative to the rated output Pr is large, and if the decrease in output Pr is 4% or more, it is determined that the margin relative to the rated output Pr is small.

[0040] The stop instruction unit 33 instructs the motor 210 to stop driving, i.e., to end the vehicle 200 running test, if, before the end of the test time t, the amount of decrease in the vehicle 200's output Pc is equal to or greater than the output threshold Pth, or if the surface temperature Ts of the motor 210 is equal to or greater than a predetermined threshold (hereinafter, temperature threshold Tth). At this time, it is determined that the margin of the rated output Pr of the motor 210 is small.

[0041] The test non-execution instruction unit 34 refers to the motor output-vehicle speed characteristic, which shows the relationship between the output Pm of the motor 210 and the running speed V of the vehicle 200. If the maximum output of the motor 210 is less than or equal to the rated output Pr, it determines that the margin is small relative to the rated output Pr and instructs not to perform the running test. The motor output-vehicle speed characteristic referred to by the test non-execution instruction unit 34 is generated by the speed calculation device 5, which will be described later.

[0042] The speed calculation device 5 is implemented, for example, by the computer COM that constitutes the margin determination device 3 (see Figure 1), and calculates data used in running tests in which the vehicle 200 is run by the running test device 4. Specifically, the speed calculation device 5 calculates the first speed V, which is the evaluation output corresponding speed of the vehicle 200 in order to exert the rated output Pr of the electric motor 210. min and the second velocity V max Calculate.

[0043] In other words, as shown in Figure 4, the speed calculation device 5 includes a vehicle speed-rotation speed characteristic generation unit 49, a vehicle speed-rotation speed characteristic input unit 50, an electric motor output-rotation speed characteristic input unit 51, an electric motor output-vehicle speed characteristic generation unit 52, and a speed calculation unit 53.

[0044] The vehicle speed - rotation speed characteristic generation unit 49 generates a vehicle speed - rotation speed characteristic indicating the relationship between the traveling speed V of the vehicle 200 obtained by running the vehicle 200 with the running test device 4 and the rotation speed of the electric motor 210 corresponding to this traveling speed V. More specifically, a tachometer 10 and a vehicle speed meter 11 provided in the running test device 4 are electrically connected to the speed calculation device 5 (see FIG. 1), and the vehicle speed - rotation speed characteristic generation unit 49 acquires measurement data from the tachometer 10 and the vehicle speed meter 11 and generates a vehicle speed - rotation speed characteristic. For the tachometer 10, an optical non - contact tachometer using, for example, laser light or the like is preferably used. When generating the vehicle speed - rotation speed characteristic, a pre - running test is performed only for the purpose of generating the vehicle speed - rotation speed characteristic by the running test device 4. If the vehicle speed - rotation speed characteristic is available in advance, the vehicle speed - rotation speed characteristic generation unit 49 may not be provided.

[0045] In the vehicle speed - rotation speed characteristic input unit 50, the above - mentioned vehicle speed - rotation speed characteristic is input. If the vehicle speed - rotation speed characteristic is available in advance, the vehicle speed - rotation speed characteristic may be manually input, for example, by the running test performer.

[0046] In the electric motor output - rotation speed characteristic input unit 51, an electric motor output - rotation speed characteristic indicating the relationship between the output of the electric motor 210 obtained in advance from the manufacturer or the like of the electric motor 210 and the rotation speed of the electric motor 210 is input. The electric motor output - rotation speed characteristic is, for example, manually input by the running test performer.

[0047] The electric motor output - vehicle speed characteristic generation unit 52 generates an electric motor output - vehicle speed characteristic indicating the relationship between the output of the electric motor 210 and the traveling speed V of the vehicle 200 from the input vehicle speed - rotation speed characteristic and electric motor output - rotation speed characteristic.

[0048] The speed calculation unit 53 calculates a first speed V min and a second speed V max that are the evaluation output - corresponding speeds from the electric motor output - vehicle speed characteristic generated by the electric motor output - vehicle speed characteristic generation unit 52.

[0049] <Procedure for determining the magnitude of the margin of the rated output> Next, we will explain the procedure for determining the margin of safety relative to the rated output Pr of the electric motor 210, that is, the method for evaluating the output of the electric motor 210. As shown in Figure 5, a pre-running test of the vehicle 200 is first conducted using the running test device 4 to generate a vehicle speed-rotation speed characteristic that shows the relationship between the running speed V of the vehicle 200 and the rotational speed of the electric motor 210 (step S1). The conditions for the pre-running test are as follows: the running test device 4 and vehicle 200 are set up in a test environment with a room temperature of 22 degrees Celsius and no wind; the electric motor 210 is powered not from the battery (not shown) mounted on the vehicle 200, but from a DC stabilized power supply capable of supplying power at a constant voltage. In this case, the vehicle 200 may be modified to have additional terminals that can be connected to the DC stabilized power supply. In the pre-running test, the vehicle 200 is first warmed up as a preparatory test. This preparatory test ends when the surface temperature Ts of the electric motor 210 reaches 40 degrees Celsius, after which the electric motor 210 is cooled until the surface temperature Ts reaches 30 degrees Celsius, and then the main pre-running test is conducted to generate the vehicle speed-revolution speed characteristics.

[0050] Then, as described above, the motor output-vehicle speed characteristics are calculated from the vehicle speed-rotation speed characteristics (step S2). Subsequently, it is determined from the motor output-vehicle speed characteristics whether or not there is an output greater than the rated output Pr in the motor 210, that is, whether or not the maximum output of the motor 210 is greater than the rated output Pr (step S3). If there is an output greater than the rated output Pr in the motor 210 in step S3, it is determined to be "YES" and the process proceeds to step S4. On the other hand, if there is no output greater than the rated output Pr in the motor 210 in step S3 (i.e., the maximum output of the motor 210 is less than or equal to the rated output Pr), it is determined to be "NO" and the margin of the rated output Pr is considered small, and the process ends without conducting a running test.

[0051] In step S4, the evaluation output corresponding speed to the rated output Pr, i.e., the first speed V, is determined. min and second velocity V max The first velocity V is then calculated. minA test run using the system is initiated (step S5). In the test run of this embodiment, the vehicle 200 is set to a first speed V min For example, the vehicle is run for one hour. In the running test device 4, the test conditions, the test time t and the first speed V, are set to a control device (not shown). min Enter the data and conduct a test run. During the test run, power will be supplied to the motor 210 from a DC stabilized power supply under the same conditions as the pre-test run described above, and the vehicle will be driven with the accelerator fully open.

[0052] Then, after starting the running test in step S5, it is determined in step S6 whether the decrease in the output Pc of the vehicle 200 is less than the output threshold Pth, or whether the surface temperature Ts of the electric motor 210 is less than the temperature threshold Tth, before the predetermined test time t is completed. If in step S6 the decrease in the output of the vehicle 200 is less than the output threshold Pth, or the surface temperature of the electric motor 210 is less than the predetermined temperature threshold Tth, it is determined to be "YES" and the running test is continued, and the running test is terminated after the test time t has elapsed from the start of the running test (step S7).

[0053] In step S7, after the running test has ended following the elapsed test time t from the start of the running test, it is determined whether the decrease in the output Pc of the vehicle 200 is less than the output threshold Pth (step S8). If the decrease in the output Pc of the vehicle 200 is less than the output threshold Pth in step S8, it is determined that there is a large margin of safety relative to the rated output Pr of the electric motor 210, and the process ends. On the other hand, if the decrease in the output Pc of the vehicle 200 is greater than or equal to the output threshold Pth in step S8, it is determined that there is a small margin of safety relative to the rated output Pr of the electric motor 210, and the process ends.

[0054] Returning to step S6, if the decrease in the output Pc of the vehicle 200 is not below the output threshold Pth (i.e., it is above the output threshold Pth), or if the surface temperature Ts of the electric motor 210 is not below the temperature threshold Tth (i.e., it is above the temperature threshold Tth), then it is determined to be "NO" and proceed to step S60. In step S60, it is determined that the margin of the electric motor 210 relative to its rated output Pr is small, and an instruction is given to terminate the running test before the test time t has elapsed, that is, to stop the drive of the electric motor 210, and then the flow ends.

[0055] In this embodiment, the output threshold Pth value for the decrease in output Pc is not limited to the above 4%, but can be changed as appropriate. The temperature threshold Tth is set to, for example, the allowable temperature of the electrical insulation part (winding part, etc.) of the motor 210 (for example, the temperature corresponding to the heat resistance class), but this is also not particularly limited. When setting the temperature threshold Tth, the manufacturer of the motor 210 and the manufacturer of the vehicle 200 may be required to submit documents showing the heat resistance class of the motor 210 and the allowable temperature of the electrical insulation part of the motor 210, documents showing the part of the motor 210 surface that generates the most heat and where temperature measurement is possible during continuous operation of the motor 210, documents showing the temperature of the hottest part on the surface of the motor 210 when the temperature of the electrical insulation part of the motor 210 exceeds the allowable temperature of the heat resistance class, and documents showing the basis for the difference between the allowable temperature of the electrical insulation part of the motor 210 and the allowable temperature of the hottest part on the surface of the motor 210.

[0056] <Effects and Effects> According to the evaluation system 100 of this embodiment described above, the vehicle 200 is driven for a predetermined time (test time t) so as to drive the electric motor 210 in the output range including the rated output Pr. After that, the margin determination device 3 determines that the margin of the electric motor 210 relative to the rated output Pr is large if the amount of decrease in the output Pc of the vehicle 200 is less than a predetermined output threshold Pth, and that the margin is small if the amount of decrease in the output Pc of the vehicle 200 is equal to or greater than the output threshold Pth.

[0057] To illustrate the decrease in output Pc of vehicle 200 in a real-world context, if you drive uphill with the accelerator fully open, utilizing the rated output and maintaining a constant speed, you will need to gradually reduce the incline of the hill over time to maintain the same speed as when you started driving. This "gradual reduction of the incline" is equivalent to a "decrease in output Pc," meaning that the margin of safety relative to the rated output is small. Conversely, if there is no need to gradually reduce the incline of the hill, the output Pc will not decrease, meaning that the margin of safety relative to the rated output is large.

[0058] By using such a simple structure and method, which determines the margin relative to the rated output Pr based on the decrease in the output Pc of the vehicle 200, it becomes possible to evaluate the output of the electric motor 210. Therefore, it becomes possible to exclude the registration of vehicles 200 equipped with electric motors 210 that have performance substantially exceeding the rated output Pr required by regulations.

[0059] Figure 6 shows a graph illustrating the change in motor output Pm over time during a test in which two different motors, motor X with a nominal rated output Pr of 1000 [W] and a rated voltage of 48 [V], and motor Y with a nominal rated output Pr of 400 [W] and a rated voltage of 24 [V], were continuously driven for one hour at a rotational speed that produced 600 [W] in their initial state before the test. In the test in Figure 6, the evaluation target output of the motors was set to 600 [W], not the rated output, and the margin of safety was evaluated for the two motors X and Y with different rated outputs. As a result, as shown in Figure 6, motor Y with a nominal rated output Pr of 400 [W] showed a greater decrease in output Pm than motor X with a nominal rated output Pr of 1000 [W], and motor Y also had a higher surface temperature Ts. Therefore, motor Y with a nominal rated output Pr of 400 [W] has a greater margin of safety than motor X with a nominal rated output Pr of 1000 [W], and motor Y with a nominal rated output Pr of 400 [W] may qualify as a "motor with performance substantially exceeding its rated output." In this respect, the evaluation system 100 of this embodiment can be used to avoid such a situation.

[0060] Furthermore, in this embodiment, the margin of safety relative to the rated output Pr of the electric motor 210 is evaluated by running the vehicle 200 using the running test device 4. Therefore, there is no need to disassemble the vehicle 200, take out the electric motor 210, and evaluate the margin of safety of the electric motor 210 alone, thus reducing the effort required for margin evaluation.

[0061] Furthermore, the margin determination device 3 has a stop instruction unit 33, which determines that the margin is small when the decrease in the output Pc of the vehicle 200 is greater than or equal to a predetermined output threshold Pth, or when the surface temperature Ts of the electric motor 210 is greater than or equal to a predetermined temperature threshold Tth, and instructs the motor 210 to stop driving. This prevents situations in which the electric motor 210 becomes overloaded and burns out during running tests.

[0062] Furthermore, the presence of a test non-execution instruction unit 34 in the margin determination device 3 eliminates the need to perform unnecessary running tests.

[0063] (Variation 1) Next, a modified example 1 of the above embodiment will be described. In the evaluation system 100 of modified example 1, the first speed V, which is the evaluation output corresponding speed of the vehicle 200, is used as a driving test to evaluate the margin of safety. min and second velocity V max Then, vehicle 200 will be driven.

[0064] Specifically, as shown in Figure 7, the driving test involves conducting the first test stage D1, the second test stage D2, and the third test stage D3, each with different conditions, during the test time t mentioned above. In the first test stage D1, the second speed V max The vehicle will continue driving at the specified speed for a predetermined period of time. In the second test stage D2, the first speed V min After continuing to drive at the specified speed for a set period of time, the second speed V max The vehicle will continue driving at the specified speed for a predetermined period of time. In the third test stage D3, the first speed V min The vehicle will continue driving at the specified speed for a predetermined period of time. In the second test stage D2, the vehicle will drive at the second speed. max The time spent traveling at the first speed V gradually decreases. min The configuration includes multiple stages in which the running time gradually increases. In this embodiment, the second test stage D2 includes two stages: the initial second test stage D2a and the second second test stage D2b. An example of the conditions for each test stage is as follows.

[0065] • First testing stage D1: First speed V min Driving time: 0 [min] Second speed V max Driving time: 5 [min] • Initial second examination stage D2a: First speed V min Driving time: 1 [min] Second speed V max Driving time: 4 [min] • Second attempt, second exam, stage D2b: First speed V minDriving time: 3 [min] Second speed V max Driving time: 2 [min] • Third examination stage D3: First speed V min Driving time: 5 [min] Second speed V max Driving time: 0 [min]

[0066] Each of the above-mentioned first test stage D1 to third test stage D3 may be performed for multiple cycles (for example, 12 cycles). If the first test stage D1 is performed for 12 cycles, for example, the vehicle 200 is operated continuously for 5 [min] × 12 = 1 [h]. Similarly, each of the test stages D2a, D2b, and D3 is performed for 5 [min] × 12 = 1 [h]. After performing 12 cycles of one test stage, a cooling time is provided for the electric motor 210, and after cooling until the surface temperature Ts of the electric motor 210 measured by the temperature measuring instrument 1 is approximately 30 degrees or less, the next test stage is moved on.

[0067] When conducting a running test in the above cycle, the stop instruction unit 33 of the margin determination device 3 may instruct the motor 210 to stop driving if, between each test stage, the amount of decrease in the output Pc of the vehicle 200 is equal to or greater than the output threshold Pth, or if the surface temperature Ts of the motor 210 is equal to or greater than the temperature threshold Tth, before the motor 210 is cooled.

[0068] By conducting running tests in this cycle, the first speed V is subjected to an extremely demanding load. min Compared to conducting running tests with only the motor, this method allows for gradually transitioning to more demanding load conditions during the running test, thus avoiding situations where the motor 210 becomes overloaded and burns out during the test.

[0069] (Modification 2) Next, a modified example 2 of the above embodiment will be described. In the evaluation system 100 of modified example 2, the first speed V, which is the speed corresponding to the evaluation output of the vehicle 200, is used as a driving test to evaluate the margin of safety. minor second velocity V max And, the first velocity V min or second velocity V max A third speed V that is slower than load Then, vehicle 200 will be driven.

[0070] As a first example in Modification 2, as shown in Figure 8, in the driving test, the first speed V min Test phase D11 and first speed V min A third speed V that is slower than load The test phase D12 is carried out alternately. In this case, the third speed V load The output Pm of the motor 210 corresponding to the first speed V min The output of the motor 210 will be lower than the rated output Pr (see Figure 3), but on the other hand, the current value will increase, resulting in a high load on the motor 210. That is, the first speed V min From the third velocity V load Reducing speed is similar to pinching the rotating shaft of the electric motor 210 to slow down vehicle 200. Alternatively, it's similar to temporarily increasing the gradient of an uphill slope when vehicle 200 is traveling uphill.

[0071] Such a third velocity V load By incorporating a running test using the first speed V, min Compared to conducting driving tests using only this method, it becomes possible to shorten the total test time t until the margin of safety is determined. Also, the third speed V load By adding this test, the motor 210 will "deteriorate" over time, so the third speed V load From the test, the first velocity V min When we returned to the test, the previous first velocity V min The test may start with a lower output Pm of the motor 210 compared to the previous test. Specifically, as shown by the dashed line in Figure 9, the third speed V load From the first velocity V min (Second speed V max The same applies in this case as well.) Each time it returns to the first velocity V minThe output Pc of vehicle 200 decreases. Therefore, at the start of each stage, the base output Pm of electric motor 210 decreases as the next third speed V load As the test progresses, the motor 210 will be subjected to an additional load, which will shorten the test time t required for safety margin evaluation.

[0072] Furthermore, as a second example in Modification 2, as shown in Figure 10, in the driving test, the second speed V max Test phase D21 and second speed V max A third speed V that is slower than load The test phase D22 is carried out alternately. In this case, the third speed V load The first velocity is V min and the second velocity V max The speed between, i.e., the first speed V min Faster than, and with a second velocity V max Although it is set to a lower speed, the third speed V load The first velocity is V min It may be even slower than that. load First velocity V min Faster than, and with a second velocity V max If you want to set it to a lower speed, the third speed V load Since the output Pm of the motor 210 exceeds the rated output Pr, this method is more suitable for evaluating the margin against a predetermined target output different from the rated output, rather than for evaluating the margin against the rated output of the motor 210.

[0073] Third speed V load The output Pm of the motor 210 corresponding to the second speed V max The output of the motor 210 becomes higher than the rated output Pr (see Figure 3), and the current value also increases, simply resulting in a second speed V max Compared to conducting running tests using only this method, it becomes possible to shorten the total test time t required to determine the margin of safety. Furthermore, the second speed V is in a low region for both the output Pm and current value of the motor 210. max Based on the tests conducted at the third speed V loadIncluding this test offers advantages such as reducing the possibility of burnout of the electric motor 210 while shortening the test time t. Furthermore, the third speed V load The test was conducted at the second speed V max When the test is performed multiple times, alternating with the previous test, the third velocity V gradually increases with each run. load V load1 →V load2 →...and so on, making it smaller. In this case, the third velocity V load The extent to which this can be reduced can also be used as an indicator for evaluating the margin of safety.

[0074] (Variation 3) Next, we will describe an evaluation system 100 according to a modified example 3 of the above embodiment. In the evaluation system 100 of modified example 3, the configuration of the speed calculation device 5C differs from that of the speed calculation device 5 described above. As shown in Figure 11, the speed calculation device 5C includes a vehicle output-vehicle speed characteristic generation unit 55, a vehicle output-vehicle speed characteristic input unit 56, a loss correction unit 57, and a speed calculation unit 58.

[0075] The vehicle output-vehicle speed characteristic generation unit 55 generates a vehicle speed-vehicle output characteristic that shows the relationship between the vehicle speed V obtained by running the vehicle 200 in a pre-running test and the output Pc of the vehicle 200 corresponding to this vehicle speed V. The vehicle speed-vehicle output characteristic obtained at this time is data obtained under the test conditions (test environment conditions, etc.) of the pre-running test, and may be different if the test conditions of the pre-running test are changed. Therefore, the test conditions of the pre-running test described above are just one example for identifying the vehicle speed-vehicle output characteristic that serves as the basis for safety margin evaluation, and other test conditions may be set for the pre-running test. Note that if the vehicle output-vehicle speed characteristic is available in advance, the vehicle output-vehicle speed characteristic generation unit 55 does not need to be provided.

[0076] The vehicle output-vehicle speed characteristic input unit 56 receives the above-mentioned vehicle output-vehicle speed characteristic. If the vehicle output-vehicle speed characteristic is available in advance, it may be manually entered, for example, by the person conducting the driving test.

[0077] The loss correction unit 57 calculates the motor output-vehicle speed characteristics by correcting the above-mentioned vehicle output-vehicle speed characteristics based on mechanical losses caused by drive losses, etc., in the vehicle 200. The correction value based on the losses in the vehicle 200 is obtained in advance by conducting a second pre-running test, and is input into and stored in the loss correction unit 57.

[0078] Specifically, in the second pre-running test, the power input terminal of the electric motor 210 is left open (disconnected from the battery), and as shown in Figure 12, the roller 40 of the running test device 4 is driven by the measuring electric motor 41, thereby rotating the tire 220 with the roller 40. In this way, the speed characteristic of the power required to make the electric motor 210 slip is calculated as the drive loss. This drive loss is mainly the loss that occurs in the drivetrain 230 of the vehicle 200, and the loss correction unit 57 calculates a correction value based on this loss.

[0079] Furthermore, the correction based on losses does not necessarily have to be based on the second pre-running test described above; it may also be done by multiplying (or adding) the correction value to the above vehicle output-vehicle speed characteristics at a uniform rate.

[0080] The speed calculation unit 58 calculates the first speed V, which corresponds to the evaluation output, from the motor output-vehicle speed characteristics obtained by correcting for losses as described above. min and second velocity V max Calculate.

[0081] When such a speed calculation device 5C is adopted, the procedure for determining the margin of safety relative to the rated output Pr in the electric motor 210 is as shown in Figure 13. That is, before step S3, which determines whether or not there is an output greater than the rated output Pr in the electric motor 210 from the electric motor output-vehicle speed characteristics, step S1' is performed to generate the vehicle output-vehicle speed characteristics in a pre-running test, and step S2' is performed to correct the vehicle output-vehicle speed characteristics and calculate the electric motor output-vehicle speed characteristics.

[0082] By employing such a speed calculation device 5C, even if information on the specifications of the motor 210 (such as the motor output-rotation speed characteristics mentioned above) cannot be obtained from the manufacturer of the motor 210, the first speed V corresponding to the evaluation output can be determined. min and second velocity V max It becomes possible to calculate this.

[0083] The present invention is not limited to the embodiments described above, and various modifications can be made without departing from the spirit of the invention. For example, instead of the running test device 4, a test device that drives the electric motor 210 alone may be prepared, and the margin of safety relative to the rated output Pr may be evaluated using the electric motor 210 alone.

[0084] Alternatively, instead of determining the margin from the decrease in output Pc and Pm, it may be determined that the margin is large when the surface temperature Ts of the motor 210 is below a predetermined threshold, and small when the surface temperature Ts of the motor 210 is above a predetermined threshold.

[0085] Furthermore, the present invention also includes an electric motor evaluation index presentation device comprising the above-mentioned temperature measuring instrument 1 and / or output measuring instrument 2, and a margin data generator 3a that generates and outputs margin determination data (data on the decrease in output Pc and Pm, and data on the surface temperature Ts of the electric motor 210) for determining the magnitude of the margin. In other words, the evaluation system 100 with the above configuration performs up to the "evaluation" of the margin, but the present invention is not limited thereto, and the electric motor evaluation index presentation device may present evaluation indicators for evaluating the margin, and the evaluation of the margin itself may be performed by other methods, such as by a human. [Industrial applicability]

[0086] According to the present invention, it is possible to evaluate the margin of output of an electric motor using a simple structure and method. [Explanation of Symbols]

[0087] 1...Temperature measuring device 2…Output measuring instrument 3a...Salary Data Generator 3…Margin Determination Device 4…Driving test equipment 5, 5C…Speed ​​calculation device 30...Temperature data acquisition unit 31…Output data acquisition unit 32…Judgment section 33…Stop instruction section 34…Instruction to not conduct the test 49... Vehicle speed-rotation speed characteristic generation unit 50...Vehicle speed-rotation speed characteristic input section 51…Input section for motor output-speed characteristics 52…Electric motor output - vehicle speed characteristic generation unit 53…Speed ​​calculation section 55... Vehicle output - Vehicle speed characteristic generation unit 56...Vehicle output - Vehicle speed characteristic input section 57... Loss correction unit 58…Speed ​​calculation section 100…Electric motor output evaluation system 200...vehicles 210...Electric motor D1…First testing stage D2...Second examination stage D3...Third Testing Stage Pc...Vehicle output Pm...Electric motor output Pr...Rated output Pth... Output threshold Ts…Surface temperature Tth…Temperature threshold V…Traveling speed V load …third speed V max …Second speed V min …first speed t... Exam time

Claims

1. An electric motor evaluation index presentation device that presents evaluation indexes for evaluating the output of an electric motor mounted on a vehicle (hereinafter referred to as the output to be evaluated), An output measuring device for measuring the output of the electric motor or the output of the vehicle on which the electric motor is installed, and / or a temperature measuring device for measuring the surface temperature of the electric motor, A margin data generator that generates and outputs margin determination data for determining the magnitude of the margin relative to the output to be evaluated in the electric motor, Equipped with, After the electric motor has been driven for a predetermined time (hereinafter referred to as the test time) in the output region including the output to be evaluated, the margin data generator will: If the output measuring device is provided, the data of the decrease in the output of the electric motor, or the output of the vehicle on which the electric motor is installed, is generated as the margin determination data. If the aforementioned temperature measuring device is provided, the motor evaluation index presentation device generates the surface temperature data of the motor as the margin determination data.

2. A motor output evaluation system for evaluating the output of an electric motor mounted on a vehicle (hereinafter referred to as the output to be evaluated), The motor evaluation index presentation device according to claim 1, A margin determination device for determining the magnitude of the margin, Equipped with, The motor evaluation index presentation device has the output measuring instrument, The margin determination device is, A margin data acquisition unit that acquires the margin determination data, A determination unit that, by referring to the margin determination data, determines that the margin is large when the amount of output reduction of the electric motor or the vehicle equipped with the electric motor is less than a predetermined threshold (hereinafter referred to as the output threshold), and that the margin is small when the amount of output reduction of the electric motor or the vehicle equipped with the electric motor is equal to or greater than the output threshold. An electric motor output evaluation system having the following features.

3. A motor output evaluation system for evaluating the output of an electric motor mounted on a vehicle (hereinafter referred to as the output to be evaluated), The motor evaluation index presentation device according to claim 1, A margin determination device for determining the magnitude of the margin, Equipped with, The electric motor evaluation index presentation device has the temperature measuring instrument, The margin determination device is, A margin data acquisition unit that acquires the margin determination data, A determination unit that, by referring to the margin determination data, determines that the margin is large when the surface temperature of the electric motor is less than a predetermined threshold (hereinafter referred to as the temperature threshold), and that the margin is small when the surface temperature of the electric motor is equal to or greater than the temperature threshold, An electric motor output evaluation system having the following features.

4. The motor output evaluation system according to claim 2, further comprising a stop instruction unit that, before the test time has elapsed, determines that the margin is small if the amount of decrease in the output of the motor or the vehicle on which the motor is mounted is equal to or greater than the output threshold, and instructs the motor to stop driving.

5. The motor output evaluation system according to claim 3, further comprising a stop instruction unit that determines the margin is small if the surface temperature of the motor is above a predetermined threshold (hereinafter referred to as the temperature threshold) before the test time has elapsed, and instructs the motor to stop driving.

6. The vehicle is further equipped with a driving test device for driving the aforementioned vehicle, The output measuring device is configured to measure the output of the vehicle, The motor output evaluation system according to claim 2, wherein the margin determination data is data on the amount of decrease in the output of the vehicle when the vehicle is driven for the test period at a speed at which the output to be evaluated is exerted (hereinafter referred to as the evaluation output corresponding speed) by the driving test device.

7. The vehicle is further equipped with a driving test device for driving the aforementioned vehicle, The motor output evaluation system according to claim 3, wherein the margin determination data is data of the surface temperature of the motor when the vehicle is driven for the test period at a speed at which the output to be evaluated is exerted (hereinafter referred to as the evaluation output corresponding speed) by the driving test device.

8. In the aforementioned driving test, when the lower speed among the evaluation output corresponding speeds is designated as the first speed and the higher speed as the second speed, The motor output evaluation system according to claim 6 or 7, wherein the vehicle is driven at the first speed and the second speed.

9. The motor output evaluation system according to claim 8, wherein the running test includes a first test stage of continuing to run the vehicle at the second speed for a predetermined time, a second test stage of continuing to run the vehicle at the second speed for a predetermined time after continuing to run the vehicle at the first speed for a predetermined time, and a third test stage of continuing to run the vehicle at the first speed for a predetermined time.

10. The motor output evaluation system according to claim 9, wherein the second test stage comprises a plurality of steps in which the running time of the vehicle at the first speed is gradually increased.

11. The motor output evaluation system according to claim 6 or 7, wherein the aforementioned running test alternates between a test at the speed corresponding to the evaluation output and a test at a third speed lower than the speed corresponding to the evaluation output.

12. In the aforementioned driving test, the evaluation output corresponding speed has a first speed on the low-speed side and a second speed on the high-speed side. The motor output evaluation system according to claim 11, wherein the third speed is a speed between the first speed and the second speed.

13. The motor output evaluation system according to claim 12, wherein the test of the third speed is performed multiple times in the aforementioned running test, and the third speed is gradually reduced each time.

14. The system further includes a speed calculation device that calculates the evaluation output-corresponding speed used in the aforementioned driving test, The speed calculation device is A vehicle speed-rotation speed characteristic input unit inputs a vehicle speed-rotation speed characteristic that shows the relationship between the vehicle's running speed and the motor's rotation speed, obtained by running the vehicle using the aforementioned running test device. A motor output-speed characteristic input unit that inputs a motor output-speed characteristic that shows the relationship between the output of the motor and the rotational speed of the motor, which has been obtained in advance, A motor output-vehicle speed characteristic generation unit generates a motor output-vehicle speed characteristic that shows the relationship between the motor output and the vehicle's travel speed from the vehicle speed-rotation speed characteristic and the motor output-rotation speed characteristic, A speed calculation unit that calculates the speed corresponding to the evaluation output from the motor output-vehicle speed characteristics, An electric motor output evaluation system according to claim 6 or 7, having the following:

15. The system further includes a speed calculation device that calculates the evaluation output-corresponding speed used in the aforementioned driving test, The speed calculation device is A vehicle output-vehicle speed characteristic input unit inputs a vehicle output-vehicle speed characteristic that shows the relationship between the output of the vehicle obtained by running the vehicle using the aforementioned driving test device and the vehicle's speed. A loss correction unit calculates the motor output-vehicle speed characteristic by applying a correction to the vehicle output-vehicle speed characteristic based on the drive loss in the vehicle, A speed calculation unit that calculates the speed corresponding to the evaluation output from the motor output-vehicle speed characteristics, An electric motor output evaluation system according to claim 6 or 7, having the following:

16. The motor output evaluation system according to claim 6 or 7, further comprising a motor output-vehicle speed characteristic that shows the relationship between the output of the motor and the running speed of the vehicle, and a test non-execution instruction unit that determines that the margin is small and instructs not to perform the running test when the maximum output of the motor is less than or equal to the output to be evaluated.

17. A method for presenting an evaluation index for electric motors mounted on a vehicle (hereinafter referred to as the output to be evaluated), wherein the evaluation index is presented for evaluating the output of an electric motor mounted on a vehicle, An output measurement step for measuring the output of the electric motor or the output of the vehicle on which the electric motor is mounted, and / or a temperature measurement step for measuring the surface temperature of the electric motor, A margin data generation step that generates and outputs margin determination data for determining the magnitude of the margin relative to the output to be evaluated in the electric motor, Equipped with, After driving the electric motor for a predetermined time (hereinafter referred to as the test time) in the output region including the output to be evaluated, in the margin data generation step, If the output measuring device is provided, the data of the decrease in the output of the electric motor, or the output of the vehicle on which the electric motor is installed, is generated as the margin determination data. A method for presenting an electric motor evaluation index, wherein, if the temperature measuring device is provided, the surface temperature data of the electric motor is generated as the margin determination data.

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