JP4127186B2 - Motor inspection device and inspection method - Google Patents

Description

  The present invention relates to a motor inspection apparatus and a motor inspection method for inspecting the performance of a motor. More specifically, the present invention relates to a motor inspection device and a motor inspection method capable of measuring an accurate drag torque in a short time.

  In recent years, hybrid vehicles, electric vehicles, etc. have attracted attention from the viewpoint of low pollution. In vehicle drive motors mounted on these vehicles, high-precision torque performance is required, and it is necessary to mass-produce motors with stable quality.

  As a motor inspection technique, for example, there is a technique described in Patent Document 1. That is, the drive condition can be changed, the motor to be inspected is driven along the drive condition, and the load motor is driven along the load according to the drive condition. Then, a performance simulation test apparatus has been proposed that inspects the performance of an electric product on which the motor to be inspected is mounted by calculating the performance (electrical input value, rotational speed, output torque, etc.) of each motor.

In addition, it is necessary to inspect the mechanical drag torque as the torque performance inspection of each motor. At that time, the drag torque is very small compared to the motor output torque as shown in FIG. For this reason, when drag torque (small torque) is measured with a torque meter that measures motor output torque (large torque), there is a problem that the measurement resolution is below the measurement resolution of the torque meter and measurement is not possible with high accuracy. As an inspection technique focusing on this problem, for example, there is a technique described in Patent Document 2. That is, Patent Document 2 includes a small torque arm and a high sensitivity load cell for measuring drag torque (small torque), and a torque arm and a low sensitivity load cell for measuring motor output torque (large torque). There has been proposed a torque measuring device capable of measuring each torque with high accuracy by switching each member during each torque measurement.
Japanese Patent Laid-Open No. 3-212194 JP-A-5-256713

  However, the conventional inspection apparatus described above has the following problems. That is, the performance simulation test apparatus described in Patent Document 1 is for inspecting the performance of an electric product equipped with a motor, and not for inspecting the performance of the motor itself. For this reason, it is impossible to inspect variations in performance of the motor itself. Here, the variation in the performance of the motor itself refers to a variation that occurs in the performance of each motor when a motor having the same specifications is mass-produced.

  In the torque measuring device described in Patent Document 2, the resolution problem can be solved by switching to a torque arm and load cell suitable for each measured torque. However, in the output performance inspection of motors that are mass-produced, it is required to accurately inspect a large number of motors in a short time. For this reason, the inspection time becomes long in an apparatus that uses the torque arm by switching. In addition, the torque measuring device itself becomes complicated, which increases the cost of the inspection device.

  In addition, a mechanical break-in operation is required for the motor immediately after assembly. That is, the drag torque is large immediately after assembly and is reduced by performing a running-in operation. And it stabilizes by continuing operation for a certain amount of time. Therefore, it is preferable to perform the pass / fail determination based on the drag torque in the use state after the break-in operation is completed. That is, it is possible to perform an inspection closer to the use state by measuring the drag torque after the running-in operation is completely completed. However, since it takes too much time to inspect one motor, it is not preferable for inspecting motors that are mass-produced.

  The present invention has been made to solve the problems of the conventional inspection apparatus described above. That is, an object of the present invention is to provide a motor inspection device and an inspection method capable of measuring an accurate drag torque in a short time.

A motor inspection device for the purpose of solving this problem is a motor inspection device that inspects the torque performance of a motor, and includes a current measuring means for measuring a current flowing through the motor to be inspected, and a current to the motor to be inspected. A motor driving means for rotating the motor by flowing the current, and a result obtained by measuring the current when the motor to be inspected is rotated by the motor driving means under a predetermined condition by the current measuring means and calculating based on the measured value the has a torque calculating means for dragging the torque generated in the inspected motor, is dragging torque calculated by the torque calculating means, a judging means for judging whether or not within the target range, the torque calculation means Calculates the drag torque at a plurality of timings during a predetermined period from the start of the inspection with the motor to be inspected rotated under a predetermined condition. It is characterized by determining the calculated torque whether it is within the set target range for each its timing every.

That is, in the motor inspection apparatus of the present invention, the motor to be inspected is rotated under the predetermined inspection condition by the motor driving means, and the current at that time is measured by the current measuring means. For example, in a no-load state, the motor to be inspected is rotated at a predetermined rotation speed, and the current at that rotation speed is measured. Then, it calculates the generated torque on the basis of the current by the torque calculating means. At that time, particularly in the no-load state, it is not necessary to consider other loads, and the generated torque can be calculated easily and accurately. And the quality determination of the torque calculated by the determination means is performed. That is, an inspection is performed on the torque performance of the motor itself to be inspected. Since the generated torque is calculated based on the current value, the torque is obtained without using a measuring instrument such as a torque meter. Therefore, even when a small torque such as a drag torque is inspected, an accurate torque can be acquired without depending on the resolution of the measuring instrument or the drag torque of the measuring instrument itself. In addition, there is little work load such as replacement of measuring equipment. Therefore, the time spent for inspecting one motor is short, and a motor manufactured in large quantities can be inspected in a short time.

The torque calculation unit of the motor inspection apparatus of the present invention, while rotating the motor to be inspected at a predetermined condition, during a predetermined time period from the start of inspection, to calculate the torque at a plurality of timings, the determination means , It is determined whether or not the torque calculated at each timing is within a target range set at each timing .

The torque calculation means acquires the generated torque at a predetermined timing during a predetermined period from the start of inspection. That is, the generated torque during a predetermined period is sampled. Then, it is determined whether or not the generated torque at each timing is within a target range set for each timing. Thereby, even if it is a motor just after an assembly | attachment, the quality determination of the motor can be performed in consideration of a time change. Therefore, it is possible to perform an inspection considering the drag torque in the use state after the running-in operation is completed. In addition, since the torque estimation means acquires the drag torque after the running-in operation is completed, the inspection result can be output before the running-in operation is completed. Therefore, the inspection can be completed for one motor in a short time.

The motor inspection method according to the present invention is a motor inspection method for inspecting the torque performance of a motor. A current is supplied to the motor to be inspected, and the motor is rotated under predetermined inspection conditions. The result of measuring the flowing current and calculating the result based on the measured current as the drag torque generated in the motor to be inspected, with the motor to be inspected rotated under a predetermined condition, for a predetermined period from the start of the inspection The drag torque of the motor is calculated at multiple timings, and it is determined whether the torque calculated at each timing is within the target range set at each timing. The motor is judged as a non-defective product, and if it is not within the target range, the motor is judged as a defective product.

In the motor inspection method of the present invention, it is better to rotate the motor to be inspected with no load at a predetermined rotational speed and measure the current at the rotational speed .

  According to the present invention, drag torque (small torque) and motor output torque (large torque) can be inspected without using a plurality of measuring devices. For this reason, the workload for replacing measuring instruments is small. In addition, by acquiring the torque generated during a predetermined period from the start of the inspection, it is possible to make a pass / fail judgment in consideration of temporal changes, and it is possible to perform an inspection in a state close to the usage state after the break-in operation is completed. . Therefore, a motor inspection device and an inspection method capable of measuring an accurate drag torque in a short time are realized.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the present invention will be described below in detail with reference to the accompanying drawings. In this embodiment, the present invention is applied to an inspection device for a permanent magnet synchronous motor mounted on a hybrid vehicle.

[First embodiment]
As shown in FIG. 1, the motor inspection apparatus 100 according to the first embodiment includes an inverter 2, a motor control ECU 3, a torque meter 4, a load motor 5, a load motor control unit 6, and an AC power measuring instrument 7. , A DC power measuring device 8, a DC power source 9, a motor output performance inspection control device 10, and an electromagnetic switch (hereinafter referred to as "switch") 11 for connecting a motor power cable. The torque meter 4 measures the output torque of the inspection target motor 1. The load motor 5 generates load torque to the inspection target motor 1. The load motor control unit 6 controls the load motor 5. The AC power measuring unit 7 and the DC power measuring unit 8 measure the power supplied to the inspection target motor 1. The motor output performance inspection control device 10 performs operation control of the entire system, measurement of inspection data, performance determination, and the like.

Next, an inspection method by the motor inspection apparatus 100 will be described. In this inspection, the inspection target motor 1 is operated under predetermined inspection conditions, and a current flowing through the inspection target motor 1 (hereinafter referred to as “motor current”) is measured. Then, the drag torque (small torque) is estimated from the motor current, and it is determined whether or not the estimated torque is a value within the target range. Before starting the inspection, inspection points as inspection conditions are set in advance. Figure 2 shows the inspection points (P It is a graph which shows the example of a setting of n). The vertical axis in FIG. 2 indicates the mechanical drag torque (unit: Nm) of the motor. In addition, the horizontal axis in FIG. 2 indicates the motor rotation speed (unit: rpm). The inspection point is set by specifying the inspection target rotation speed (Rm *). Inspection points are arbitrarily set according to the purpose.

  The torque performance inspection procedure will be described below. In the inspection of torque performance, a drag torque that is a small torque and a motor output torque that is a large torque are inspected by different methods. First, the drag torque inspection procedure will be described with reference to the flowcharts of FIGS. The following control is mainly performed by the motor output performance inspection control device 10. In addition, as a preliminary preparation for this inspection, the switch 11 is set in a connected state. That is, the inspection target motor 1 is set in a state where power can be supplied via the inverter 2. Further, the inspection target motor 1 is separated from the torque meter 4. That is, when the motor 1 to be inspected rotates, the motor 1 is not affected by the torque meter 4 and the load motor 5. Hereinafter, “no load” means that the inspection target motor 1 is disconnected from the torque meter 4.

First, one inspection point (P n) is selected (S1). The selection order of inspection points is set in advance, and is automatically selected in that order. The order can be set arbitrarily. Alternatively, the inspector may arbitrarily set each time inspection is performed.

Next, the selected inspection point (P The motor drive DC voltage in n) is set (S2). Specifically, a voltage setting signal is sent from the motor output performance inspection control device 10 to the DC power source 9. The reason why the voltage is variable is that in a hybrid vehicle motor or the like, the supply voltage from the battery mounted on the vehicle to the motor varies depending on the running conditions. Therefore, in the motor output performance inspection, it is necessary to perform the performance inspection with a voltage arbitrarily set within a range that can vary depending on vehicle conditions. This is different from the case of industrial motors that are assumed to be driven by commercial power.

Next, the selected inspection point (P The inspection target motor 1 is rotated in an unloaded state at the inspection target rotation speed (Rm *) of n) (S3). Specifically, a target rotational speed control signal is sent from the motor output performance inspection control device 10 to the motor control ECU 3. The motor control ECU 3 controls the motor current based on the target rotational speed control signal. That is, a current is supplied to the inspection target motor 1 via the inverter 2 to cause the inspection target motor 1 to run idle to generate torque.

  Next, it is determined whether or not the rotation speed of the inspection target motor 1 has reached the inspection target rotation speed (Rm *) (S4). Specifically, the motor output performance inspection control device 10 makes a determination based on a rotation speed detection signal sent from the motor control ECU 3. When the rotation speed of the inspection target motor 1 has reached the inspection target rotation speed (S4: YES), the process proceeds to S5. On the other hand, when the rotation speed of the inspection target motor 1 does not reach the inspection target rotation speed (S4: NO), the process of S4 is repeated.

  Next, motor output characteristic data is measured in a state where the inspection target motor 1 is idled (S5). Specifically, the AC power measuring instrument 7 measures the power of the AC current flowing between the inverter 2 and the inspection target motor 1. Thereby, the voltage (Vac), the current (Iac), and the power (Pac) are measured. Then, the measurement result is recorded by the motor output performance inspection control device 10. Further, the motor control ECU 3 measures the control state data of the inspection target motor 1 and the inverter 2. This data is mainly used to determine whether or not the inspection target motor 1 is normally controlled when measuring the generated torque and the rotational speed.

Next, it is determined whether or not the motor current for the preset number of times has been measured (S6). When the motor current is measured a predetermined number of times (S6: YES), the average current (Iav) is calculated. On the other hand, when the motor current is not measured a predetermined number of times (S6: NO), the measurement of the motor current is repeated up to the predetermined number of times. The reason for calculating the average current in this way is that the fluctuation of the motor current in the rotational speed control state is large. Therefore, in order to perform stable data measurement, multiple measurements are performed and the average value is selected as the selected inspection point (P The motor current in n) is used for subsequent drag torque inspection.

Next, the drag torque (Tm) is estimated from the motor current (Iav) calculated in the process of S6 (S7). In general, the motor current (I) and the generated torque (T) have the relationship of the following formula (1).
T = Ke × I (1)
Ke in the formula (1) is a motor back electromotive force constant. The generated torque (T) is calculated by this equation (1), and the calculated generated torque (T) is calculated as the inspection point (P The drag torque (Tm) at n) is estimated.

The torque generated when a current is passed through the permanent magnet synchronous motor is expressed in detail by the following equation (2).
T = P (φ × Iq + (Ld−Lq) × Id × Iq) (2)
In Equation (2), P is the number of motor pole pairs, φ is the amount of permanent magnet magnetic flux, Lq is the q-axis inductance, and Ld is the d-axis inductance. These values are known values specific to the motor 1 to be inspected. Iq is a q-axis current command, and Id is a d-axis current command. These values are controllable parameters and are current command values for current control of the permanent magnet synchronous motor on the dq axis coordinates. The motor current control in the dq axis coordinates is a known technique and will not be described in detail. Iq is also called torque current and contributes to generation of motor torque. Id is also called a field current and affects the motor magnetic force. That is, in the permanent magnet synchronous motor, I in the formula (1) is subdivided into Id and Iq in the formula (2), Ke in the formula (1) is subdivided into Ld, Lq and the like in the formula (2). However, the basic formula is summarized in formula (1).

  In addition, in the estimation of the drag torque (Tm), actual machine data separately measured may be used in addition to the above-described expression (1). Specifically, the generated torque is measured for each rotation speed and motor current with the master motor. As a result, it is estimated that the motor current and the generated torque are in a proportional relationship as shown in FIG. Therefore, the drag torque (Tm) can be estimated from the motor current (Iav) calculated in the process of S6. This method is particularly effective when the output characteristics differ depending on the number of rotations of the motor to be inspected as shown in FIG.

Next, it is determined whether or not the estimated drag torque (Tm) is within the target range (S8). Specifically, the inspection point (P For n), it is determined whether or not the drag torque (Tm) is equal to or lower than the torque upper limit value (TmU) (see FIG. 2). When the drag torque (Tm) is not less than or equal to the torque upper limit value (TmU) (S8: NG), the inspection point (P n) that the drag torque (Tm) is poor, the inspection NG flag (F Tm n) (S9). When the drag torque (Tm) is equal to or lower than the torque upper limit value (TmU) (S8: OK), the process of S9 is bypassed. Thereafter, the process proceeds to S10 in FIG.

  Next, it is determined whether all inspection points have been inspected (S10). When there is an inspection point that has not yet been inspected (S10: NO), the inspection point is selected and the processes after S2 are performed. When the inspection has been completed for all inspection points (S10: YES), the process proceeds to S11.

Next, it is determined whether or not an inspection NG flag is recorded (S11). Specifically, the inspection NG flag (S9: F Tm Check if n) is recorded. If the inspection NG flag is not recorded (S11: NO), the inspection target motor 1 is determined to be non-defective (S12), and the drag torque inspection is terminated. On the other hand, when the inspection NG flag is recorded (S11: YES), the inspection target motor 1 is determined to be defective (S13), and the drag torque inspection is terminated. As a result, a motor having a poor drag torque is detected.

  Next, the inspection of the motor output torque will be described. When inspecting the motor output torque, the inspection object motor 1 and the torque meter 4 are coupled. In other words, the inspection motor 1, the torque meter 4, and the load motor 5 are mechanically coupled.

  In the motor inspection apparatus 100, the quality of the motor output torque (large torque) is determined according to the following procedure. First, the load motor 5 is rotated at the inspection target rotation speed (Rm *). Specifically, a rotation control instruction signal is sent from the motor output performance inspection control device 10 to the load motor control unit 6. Since the inspection target motor 1 is mechanically coupled to the load motor 5, when the load motor 5 rotates, the inspection target motor 1 also rotates in the same direction at the same rotational speed. Next, an operation command is sent to the motor control ECU 3 so that the inspection target motor 1 operates at the inspection target torque (Tm *). In other words, a current is passed through the motor 1 to be inspected via the inverter 2 to generate torque. Next, the motor output torque is measured in a state where the inspection target motor 1 is subjected to torque output. Specifically, the motor output torque (Tm) is measured by the torque meter 4. It is determined whether or not the motor output torque (Tm) measured by the torque meter 4 is within the target range. As a result, a motor with a poor motor output torque is detected.

  In this embodiment, the motor inspection device can acquire drag torque (small torque) from the motor current and motor output torque (large torque) from the torque meter 4 and inspect those torques. The torque may be estimated from the motor current. Moreover, the inspection apparatus which measures only drag torque may be sufficient. In that case, it is not necessary to provide the torque meter 4, the load motor 5, and the load motor control unit 6 as in the motor inspection apparatus 101 shown in FIG.

[Second form]
In the motor inspection apparatus according to the second embodiment, the inspection is performed in consideration of the drag torque in the use state after completion of the break-in operation. The motor inspection apparatus of this embodiment has the same equipment configuration as the motor inspection apparatus 100 shown in FIG. In this inspection, the drag torque of the inspection target motor 1 is measured at a predetermined timing during a preset period. Specifically, the torque is measured at 1 minute intervals for 3 minutes from the start of the inspection. Then, it is determined whether or not each measured torque is a value within the target range. Here, as shown in FIG. 7, the drag torque of a non-defective motor decreases with the passage of time and is stabilized by continuing the operation for a certain period of time. On the other hand, the drag torque of a defective motor has a small decrease from the start of inspection. Therefore, the state where the drag torque is high continues. Also, the drag torque is not stable even after a certain amount of time has passed. Focusing on this difference, the quality determination in the usage state of the inspection target motor 1 is performed.

  Next, an inspection method by the motor inspection apparatus 100 will be described based on the flowchart of FIG. Also in this inspection, before starting the inspection, an inspection point as an inspection condition is set in advance. The following control is mainly performed by the motor output performance inspection control device 10. In addition, as a preliminary preparation for this inspection, the switch 11 is set in a connected state. In other words, the current to be inspected 1 is allowed to flow through the inverter 2. In addition, the motor 1 to be inspected is one that has just been assembled and is not subjected to a running-in operation.

First, the inspection point (P The inspection target rotation number (Rm *) of n) is rotated in an unloaded state (S21). This processing is the same as the processing from S1 to S4 in the flowchart shown in FIG.

  Next, motor output characteristic data is measured in a state where the inspection target motor 1 is idled (S22). Specifically, the AC power measuring instrument 7 measures the power of the AC current flowing between the inverter 2 and the inspection target motor 1. Thereby, the voltage (Vac), the current (Iac), and the power (Pac) are measured. Then, the measurement result is recorded by the motor output performance inspection control device 10.

  Next, it is determined whether or not the motor current for the preset number of times has been measured (S23). When the motor current is measured a predetermined number of times (S23: YES), the average current (Iav) is calculated. On the other hand, when the motor current is not measured a predetermined number of times (S23: NO), the measurement of the motor current is repeated up to the predetermined number of times.

  Next, the drag torque (Tm) is estimated from the motor current (Iav) calculated in the process of S23 (S24). The motor current (I) and the generated torque (T) have the relationship of the formula (1), and the drag torque (Tm) is estimated from the motor current (Iav) of the motor 1 to be inspected rotating in the no-load state. .

  Next, it is determined whether or not it is within a preset measurement period (S25). If it is during the measurement period (S25: NO), the process returns to S22 and the motor current is measured again. That is, during the measurement period, the motor current is measured at a predetermined timing, and the drag torque at that timing is estimated. For example, in this embodiment, as shown in FIG. 7, the measurement period is 3 minutes, and the drag torque is estimated at 1 minute intervals. Note that the measurement period and the timing at regular intervals are set according to the type and purpose of the motor. The drag torque at each timing is recorded by the motor output performance inspection control device 10. If the measurement period has ended (S25: YES), the process proceeds to S26.

Next, it is determined whether or not each drag torque (Tm) is within a target range (S26). Specifically, it is determined whether or not the drag torque at each timing is equal to or less than the torque upper limit value (TmU). The torque upper limit value (TmU) varies depending on the timing as shown in FIG. If at least one of the drag torques is equal to or greater than the upper limit value (S26: NG), the fact that the drag torque at the timing is defective indicates that the check NG flag (F Tm n) (S27). As a result, even if the drag torque at the initial stage is good, if even one drag torque is defective at the timing during the subsequent measurement period, it can be estimated that the probability of a fault is high after that, and the motor to be inspected is high. 1 can be determined as a defective product. On the other hand, when all the drag torques are below the upper limit value (S26: OK), the process of S27 is bypassed. That is, if the drag torque is good at all timings during the measurement period (in FIG. 7, timings of 1-minute intervals from 0 to 3 minutes), it can be assumed that the non-defective product will be judged afterwards. The motor 1 can be determined as a non-defective product. After completion of the determination, the present process is terminated according to the flowchart shown in FIG.

  In addition, although the motor test | inspection apparatus of this form is estimating the generated torque from a motor current, it is not restricted to this from a viewpoint of acquiring the drag torque in a use condition. That is, the inspection target motor 1 may be coupled to the torque meter 4 and the generated torque may be measured by a measuring device such as the torque meter 4.

  As described above in detail, in the drag torque test of the first embodiment, the motor 1 to be inspected is rotated at a predetermined rotational speed with no load, and the motor current at that time is measured. The generated torque is estimated based on the motor current. Then, the pass / fail judgment is performed based on the estimated torque. That is, the inspection of the torque performance of the inspection target motor 1 itself is performed. For small torque such as drag torque, the torque is estimated by motor current without using a measuring instrument such as a torque meter. On the other hand, for a large torque such as a motor output torque, the torque is measured by a measuring device such as a torque meter. For this reason, the torque meter is connected only when measuring the motor output torque, and when measuring the drag torque, there is no need to replace the measuring device. Therefore, even a motor produced in large quantities can be inspected in a short time. In addition, the equipment configuration is simple and the cost can be reduced. Further, since the drag torque is measured without using a measuring instrument such as a torque meter, it is not necessary to consider the drag torque of these measuring instruments. Therefore, accurate torque can be measured. In addition, there is little load for equipment adjustment. Therefore, a motor inspection device and an inspection method capable of inspecting the performance of the motor itself and measuring the drag torque in a short time have been realized.

  In the drag torque test of the second form, the generated torque is acquired at a predetermined timing during the measurement period. The generated torque at each timing is determined within a target range set for each timing. As a result, it is possible to perform an inspection in consideration of the temporal change of the drag torque. Therefore, it is possible to perform inspection in consideration of drag torque in a state close to the use state after the running-in operation is completed. In this torque test, the drag torque in the use state is estimated by measuring the drag torque within a predetermined measurement period from the start of the test. That is, the inspection result can be output before the break-in operation is completed. Therefore, the inspection can be completed for each motor in a short time.

  Note that this embodiment is merely an example, and does not limit the present invention. Therefore, the present invention can naturally be improved and modified in various ways without departing from the gist thereof. For example, in the embodiment of the present embodiment, the permanent magnet synchronous motor is inspected, but is not limited thereto. For example, an electromagnet synchronous motor may be used. Further, it may be a DC motor or an AC motor. Moreover, in the Example of this form, although the test | inspection is performed about the motor mounted in a hybrid vehicle, the motor mounted in an electric vehicle etc. may be sufficient.

It is a figure which shows the system configuration | structure of the motor inspection apparatus which concerns on a 1st form. It is a figure which shows an example of the measurement point of a motor output performance test | inspection. It is a flowchart (start-A) which shows operation | movement of the drag torque test | inspection in a 1st form. It is a flowchart (A-end) which shows operation | movement of the drag torque test | inspection in a 1st form. It is a figure which shows the relationship between a motor current and a motor output torque. It is a figure which shows the system configuration | structure of the motor test | inspection apparatus of the test of drag torque. It is a figure showing the time change of drag torque. It is a flowchart which shows the operation | movement of the drag torque test | inspection in a 2nd form. It is a figure which shows the comparative example of motor output torque (large torque) and drag torque (small torque).

Explanation of symbols

1 Motor to be inspected 2 Inverter 3 Motor control ECU
7 AC power measuring device 8 DC power measuring device 10 Motor output performance inspection control device 100 Motor inspection device

Claims (4)

In a motor inspection device that inspects the torque performance of a motor,
Current measuring means for measuring the current flowing through the motor to be inspected;
Motor driving means for rotating the motor by passing a current through the motor to be inspected;
Drag current generated in the motor to be inspected by measuring the current when the motor to be inspected is rotated by the motor driving means under a predetermined condition by the current measuring means and calculating the result based on the measured value. A torque calculating means ,
Determining means for determining whether or not the drag torque calculated by the torque calculating means is within a target range;
The torque calculating means calculates drag torques at a plurality of timings during a predetermined period from the start of inspection while rotating a motor to be inspected under predetermined conditions.
The determination means determines whether or not the torque calculated at each timing is within a target range set at each timing . The motor inspection device according to claim 1,
It said torque calculation means, a motor, characterized in that the inspection target motor by the motor driving means rotates a and at a predetermined rotation speed without load, calculates the drag torque occurs in the test object of the motor at that time Inspection device. In a motor inspection method for inspecting the torque performance of a motor,
A current is passed through the motor to be inspected, the motor is rotated under the specified inspection conditions, and the current flowing through the motor is measured at that time.
The result calculated based on the measured current is the drag torque generated in the motor to be inspected .
The drag torque of the motor is calculated at a plurality of timings during a predetermined period from the start of inspection with the motor to be inspected rotated under predetermined conditions.
Determine whether the torque calculated at each timing is within the target range set at each timing ,
A motor inspection method characterized in that if the motor is within the target range, the motor is judged as a non-defective product, and if it is not within the target range, the motor is judged as a defective product. In the motor inspection method according to claim 3,
A motor inspection method, comprising: rotating a motor to be inspected at a predetermined rotational speed without load, and measuring a current at the rotational speed.

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