JP2020092546A - Wound motor system and abnormality detection method - Google Patents

Abstract

To provide a wound motor system and an abnormality detection method capable of suppressing burnout of an electric motor.SOLUTION: The wound motor system in an embodiment is a wound-rotor type motor that rotates a shaft, which includes: a collector ring that rotates with a shaft; the wound-rotor type motor that has a brush that slides on the rotating collector ring and electrically connects to the collector ring; a thermometer that measures the temperature of the collector ring or brush without contact; and a controller that determines that an abnormality has occurred in the wound-rotor type motor on the basis of the temperature of the collector ring or brush and stops the operation of the wound-rotor type motor.SELECTED DRAWING: Figure 1

Description

Embodiments according to the present invention relate to a wire-wound motor system and an abnormality detection method.

Conventionally, a wire-wound electric motor has been used as a water supply pump for water and sewerage. In the wire-wound motor, a rotor is provided with a three-phase rotor winding, and a secondary current is drawn to the outside from the rotor winding via a collector ring and a brush. This secondary current can be used to control the rotational speed of the wound motor.

The brush slides on a rotating collector ring. Abnormalities such as chattering on the brush may cause heating or sparks. In this case, if the wire-wound motor continues to operate as it is, the abnormality may worsen, the amount of sparks may increase, and the wire-wound motor may burn out. Further, there is a problem that a fire may occur due to ignition of an object around the wire-wound electric motor.

JP, 2017-093044, A

Provided are a wire-wound electric motor system and an abnormality detection method capable of suppressing the occurrence of burnout of the electric motor.

The winding type electric motor system according to the present embodiment is a winding type electric motor that rotates a shaft, and includes a collector ring that rotates with the shaft, and a brush that slides on the rotating collector ring and is electrically connected to the collector ring. And a thermometer that measures the temperature of the collector ring or brush in a non-contact manner, and determines that an abnormality has occurred in the wound motor based on the temperature of the collector ring or brush, and stops the operation of the wound motor. And a control unit.

The figure which shows an example of a structure of the wire-wound electric motor system by 1st Embodiment. The figure which shows an example of a structure of the collector ring and brush by 1st Embodiment. The figure which shows an example of a structure of the collector ring, the non-contact thermometer, the thermometer receiver, and the control part by 1st Embodiment. 6 is a flowchart showing an operation example of the abnormality detection method according to the first embodiment. The figure which shows an example of a structure of the wire-wound electric motor system by 2nd Embodiment. The flowchart which shows the operation example of the abnormality detection method by 2nd Embodiment.

Hereinafter, embodiments according to the present invention will be described with reference to the drawings. This embodiment does not limit the present invention.

The drawings are schematic or conceptual, and the ratios of the respective parts are not necessarily the same as the actual ones. In the specification and the drawings, elements similar to those described in regard to the drawings already described are designated by the same reference numerals, and detailed description thereof will not be repeated.

(First embodiment)
FIG. 1 is a diagram showing an example of the configuration of a wire-wound motor system 1 according to the first embodiment. The wound motor system 1 is used, for example, in a water supply pump for water and sewerage. The winding motor system 1 includes a primary side main circuit 10, a protective relay 11, a winding motor 20, a non-contact thermometer 30, a thermometer receiver 40, a control unit 50, a display unit 60, and a memory. And a section 70.

The primary-side main circuit 10 as a power supply unit is, for example, a three-phase AC power supply. The primary-side main circuit 10 operates the wire-wound motor 20 by converting it into AC power having a predetermined voltage, current and frequency and supplying the power to the wire-wound motor 20. The primary-side main circuit 10 supplies a primary current to a stator winding provided on a stator (not shown) of the wound motor 20. As a result, the rotor (not shown) of the wire wound motor 20 rotates.

The protective relay (relay circuit) 11 is connected to the primary side main circuit 10. When a large current of a predetermined current value or more flows from the primary-side main circuit 10, the protective relay 11 shuts off the primary-side main circuit 10 from the power system and stops the power supply to the primary-side main circuit 10. Therefore, the protective relay 11 can detect the abnormality of the current value of the primary current supplied to the stator and stop the operation of the wire-wound electric motor 20.

The winding motor 20 has a shaft 21 and a secondary side current collector 22. For example, a water pump (not shown) is connected to the tip of the shaft 21. The wound electric motor 20 operates by the power supply from the primary side main circuit 10. The winding electric motor 20 rotates the shaft 21 together with the rotor with the central axis A of the shaft 21 as a rotation axis. As a result, the water pump is driven.

The secondary side current collector 22 has a collector ring 221, a brush 222, and a cover 223. Since the wire-wound motor 20 shown in FIG. 1 is a three-phase AC generator, three collector rings 221 and three brushes 222 corresponding to each of the U phase, V phase, and W phase are provided.

The collector ring 221 is provided on the outer circumference of the insulating cylinder 224 that covers the shaft 21. The insulating tube 224 electrically insulates the collector ring 221 from the shaft 21. The insulating cylinder 224 is, for example, a resin insulating mold. The collector ring 221 is provided concentrically with the shaft 21 and the insulating cylinder 224, and rotates together with the shaft 21. The collector ring 221 is electrically connected to a three-phase rotor winding provided on the rotor. As described later, a secondary current is taken out from the rotor winding through the collector ring 221 and the brush 222, and the rotation speed of the shaft 21 is controlled. Copper, for example, is used as the material of the collector ring 221.

FIG. 2 is a diagram showing an example of the configuration of the collector ring 221 and the brush 222 according to the first embodiment. FIG. 2 shows a cross section of the collector ring 221 of one of the three phases taken along line BB in FIG. The secondary side current collector 22 further includes a brush holder 225 and a spring 226.

The brush 222 is provided so as to contact the collector ring 221 along the circumferential direction of the annularly wound collector ring 221. The brush 222 is held by a brush holder 225. The brush 222 is pressed against the collector ring 221 by a spring (pressing part) 226. The collector ring 221 rotates with the shaft 21 with the central axis A of the shaft 21 as a rotation axis. Since the brush 222 is fixed by the brush holder 225 and the spring 226, the brush 222 slides on the rotating collector ring 221. The brush 222 is worn by sliding on the collector ring 221, but is pressed by the spring 226 with a substantially constant pressure. However, as the brush 222 wears further, the brush 222 is replaced. The brush 222 is replaced regularly, for example, once every two months. The number of the brushes 222 is not limited to four shown in FIG. 2, and may be changed according to the capacity (output) of the wire wound electric motor 20.

The material of the brush 222 includes, for example, carbon. As described above, the collector ring 221 rotates and the collector ring 221 rubs the brush 222. At this time, a film is formed on the surface of the collector ring 221 by the carbon contained in the abrasion powder of the brush 222 and the moisture in the air. This coating reduces the frictional force between the collector ring 221 and the brush 222. As a result, the brush 222 can slide more smoothly on the collector ring 221, and the amount of wear of the brush 222 is suppressed. Further, the amount of heat generated between the collector ring 221 and the brush 222 is also suppressed.

The brush 222 is electrically connected to the collector ring 221. As a result, the secondary current that passes through the collector ring 221 and the brush 222 from the rotor winding is drawn to the outside of the wound motor 20. Outside the winding motor 20, the brush 222 is connected to the rotation speed control unit 80. The rotation speed control unit 80 is, for example, a resistance, and its resistance value (secondary resistance value) can be adjusted. By adjusting the secondary resistance value, the starting current can be reduced without reducing the starting torque. Further, by adjusting the secondary resistance value, the slip can be adjusted by utilizing the characteristic of proportional transition. The slip is the ratio of the difference between the rotational speed of the rotating magnetic field (synchronous speed) and the actual rotational speed of the rotor to the synchronous speed. Therefore, the rotation speed of the shaft 21 can be controlled by adjusting the secondary resistance value. In addition, when the rotation speed of the shaft 21 is controlled by the secondary resistance, the loss due to the secondary resistance increases. Therefore, instead of the secondary resistance, the rotation frequency of the shaft 21 may be controlled by the slip frequency current flowing through the rotor winding. In this case, the wire wound motor 20 may be, for example, a Kramer system combined with a DC motor or a SELVIUS system combined with another induction generator.

The non-contact thermometer 30 is provided, for example, above the collector ring 221 and the brush 222 and above the cover 223 that covers the collector ring 221 and the brush 222. The non-contact thermometer 30 measures the temperature of the surface of the collector ring 221 in a non-contact manner. The non-contact thermometer 30 sends the measured temperature of the collector ring 221 to the thermometer receiver 40. The non-contact thermometer 30 is, for example, an infrared camera or a radiation thermometer.

As shown in FIG. 2, since the surface of the collector ring 221 is a sliding surface with the brush 222, it is difficult to attach the contact thermometer to the collector ring 221. On the other hand, since the non-contact thermometer 30 can measure the temperature in a non-contact manner, the temperature of the collector ring 221 rotating without being rubbed and broken can be easily measured.

As shown in FIG. 1, the thermometer receiver 40 receives the temperature of the collector ring 221 from the non-contact thermometer 30. The thermometer receiver 40 sends the temperature of the collector ring 221 to the display unit 60 and the storage unit 70 via the control unit 50. Further, a threshold value is preset in the thermometer receiver 40 via the control unit 50. When the temperature of the collector ring 221 reaches the threshold value, the thermometer receiver 40 determines that an abnormality has occurred in the wire wound motor 20. The thermometer receiver 40 sends a signal informing the control unit 50 of the abnormality. The threshold value may be directly set in the thermometer receiver 40 by the user. The details of the threshold will be described later with reference to FIG.

The control unit 50 is connected to the primary side main circuit 10, the thermometer receiver 40, the display unit 60, and the storage unit 70. The control unit 50 receives a signal indicating an abnormality from the thermometer receiver 40. Thereby, the control unit 50 can detect the abnormality of the wire-wound motor 20 and control the wire-wound motor 20.

As described above, the brush 222 is in pressing contact with the rotating collector ring 221. Here, if the coating film on the surface of the collector ring 221 is destroyed, the brush 222 may be caught due to friction and chattering may occur. Chattering means that mechanical vibration occurs in the brush 222. In addition, chattering may occur even if the pressure of the brush 222 is not appropriate due to insufficient fixing of the brush 222 or foreign matter is mixed in the vicinity of the collector ring 221 and the brush 222.

As the user continues to operate the wire-wound electric motor 20 without noticing chattering, sparks due to chattering, surface roughness of the collector ring 221 surface, abnormal wear of the brush 222, and increase in spark volume may be aggravated. .. Furthermore, the wound electric motor 20 may be burned, which may cause a fire. Further, as the abnormality worsens, the temperature around the collector ring 221 and the brush 222 may become higher due to the sparks of chattering.

Therefore, the thermometer receiver 40 determines the abnormality of the wire wound motor 20 based on the temperature of the collector ring 221. When detecting an abnormality in the wire-wound motor 20, the control unit 50 stops the power supply to the primary side main circuit 10 and stops the operation of the wire-wound motor 20. That is, the wound electric motor 20 stops the rotation of the shaft 21. As a result, the occurrence of burnout of the wire wound motor 20 can be suppressed. The details of the abnormality detection method will be described later with reference to FIG.

The display unit 60 displays a warning or an error when the thermometer receiver 40 determines that an abnormality has occurred in the wire-wound electric motor 20. Further, the display unit 60 may display the wire-wound motor 20 that has detected an abnormality, or may display a message regarding the abnormality. The display unit 60 may also receive and display the temperature of the collector ring 221 from the thermometer receiver 40 via the control unit 50.

The storage unit 70 stores the temperature of the collector ring 221 received from the thermometer receiver 40 via the control unit 50.

FIG. 3 is a diagram showing an example of the configuration of the collector ring 221, the non-contact thermometer 30, the thermometer receiver 40, and the controller 50 according to the first embodiment. As shown in FIG. 3, collector rings 221u, 221v, 221w corresponding to U-phase, V-phase and W-phase, non-contact thermometers 30u, 30v, 30w and thermometer receivers 40u, 40v, 40w are provided. ..

The non-contact thermometers 30u, 30v, 30w measure the temperatures Tu, Tv, Tw of the collector rings 221u, 221v, 221w, respectively, every predetermined sampling period. The non-contact thermometers 30u, 30v, 30w send the temperatures Tu, Tv, Tw of the collector ring 221 to thermometer receivers 40u, 40v, 40w, respectively.

The thermometer receivers 40u, 40v, 40w display the temperatures Tu, Tv, Tw of the collector ring 221 received from the non-contact thermometer 30 on the display and send them to the control unit 50.

The thermometer receivers 40u, 40v, and 40w hold two thresholds of the temperature of the collector ring 221 in advance. The thermometer receivers 40u, 40v, 40w compare the temperatures Tu, Tv, Tw of the collector ring 221 with the threshold value every predetermined sampling period. When the temperatures Tu, Tv, Tw of the collector ring 221 reach the threshold value, the thermometer receivers 40u, 40v, 40w send a signal to the control unit 50. At this time, the respective thermometer receivers 40u, 40v, 40w are performing the above comparison. The thermometer receiver 40 sends a signal to the control unit 50 when at least one of the temperatures Tu, Tv, and Tw of the collector ring 221 reaches the threshold value. That is, when the maximum temperature Thigh of the temperatures Tu, Tv, and Tw of the collector ring 221 reaches the threshold value, a signal is sent from the thermometer receiver 40 to the control unit 50.

The two thresholds are the first temperature and the second temperature. The second temperature is higher than the first temperature. The higher the temperature of the collector ring 221, the greater the degree of abnormality from light failure to severe failure. Therefore, when the temperature of the collector ring 221 reaches the first temperature and the second temperature, the thermometer receiver 40 determines that the winding-type motor 20 has a light failure and a serious failure, respectively, and the control unit 50 causes the winding-type motor 20 to have a failure. Stop the operation of.

If the coating on the surface of the collector ring 221 is normal, the temperature of the collector ring 221 becomes about 60° C. to about 80° C. due to the friction with the brush 222. Further, as described above, the coating film formed on the surface of the collector ring 221 contains carbon and water. However, when the temperature of the collector ring 221 reaches a high temperature of about 100° C. or higher, which is the boiling point of water, the water content of the film may evaporate and the film may be destroyed. When the coating film is destroyed, the abnormality is more likely to be exacerbated.

Therefore, the first temperature may be set to a temperature higher than the temperature between the collector ring 221 and the brush 222 in a normal state and lower than about 100° C. The first temperature is, for example, about 90°C. The second temperature is, for example, about 100°C. By setting the second temperature to about 100° C., the operation of the wire-wound electric motor 20 can be stopped before the coating film is broken and the abnormality is more likely to be further aggravated.

Next, the operation of the abnormality detection method will be described with reference to FIG.

FIG. 4 is a flowchart showing an operation example of the abnormality detection method according to the first embodiment.

First, the control unit 50 sends a signal to the primary side main circuit 10 to operate the wire wound electric motor 20 (S10). The wound electric motor 20 rotates the shaft 21.

Next, the non-contact thermometer 30 measures the temperatures Tu, Tv, Tw of the collector ring 221 (S20). The non-contact thermometer 30 sends the temperatures Tu, Tv, Tw of the collector ring 221 to the thermometer receiver 40.

Next, the thermometer receiver 40 determines whether the maximum temperature Thigh of the temperatures Tu, Tv, and Tw of the collector ring 221 is about 90° C. or higher (S30). When the maximum temperature Thigh is less than about 90° C. (NO in S30), the thermometer receiver 40 determines that the wire wound motor 20 is normal, and the control unit 50 continues the operation of the wire wound motor 20. Then, step S20 is executed again. When the maximum temperature Thigh is about 90° C. or higher (YES in S30), the thermometer receiver 40 determines that an abnormality has occurred in the wire-wound motor 20. Next, the thermometer receiver 40 determines whether the maximum temperature Thigh is about 100° C. or higher (S40).

When the maximum temperature Thigh is less than about 100° C. (NO in S40), that is, when the maximum temperature Thigh is about 90° C. or more and less than about 100° C., the thermometer receiver 40 causes the winding-type motor 20 to have a minor failure. It is determined that an abnormality has occurred (S50). In this case, the thermometer receiver 40 sends a signal notifying the control unit 50 of the abnormality. After that, the control unit 50 normally stops the winding motor 20 (S60). The normal stop is to stop in accordance with the stop operation of the winding electric motor 20 at the normal time. For example, the wire wound electric motor 20 is stopped so that the water supply pump is stopped after closing the discharge valve connected to the water supply pump. This is because the degree of abnormality is lighter than that of a major failure and the possibility that the wire wound electric motor 20 will be immediately burned out even if the operation is continued. After that, the display unit 60 displays a warning indicating that a malfunction of the wire-wound motor 20 has occurred due to a light failure (S90).

When the maximum temperature Thigh is about 100° C. or higher (YES in step S40), the thermometer receiver 40 determines that the winding motor 20 has a serious failure (S70). In this case, the thermometer receiver 40 sends a signal notifying the control unit 50 of the abnormality. After that, the control unit 50 causes the winding motor 20 to make an emergency stop (S80). The emergency stop is an immediate emergency stop of the wire-wound motor 20 without following the stop operation of the wire-wound motor 20 under normal conditions. For example, the control unit 50 immediately stops the power supply to the primary side main circuit 10, and the wire-wound electric motor 20 immediately stops the rotation of the shaft 21. In the emergency stop, the operation of the wire-wound motor 20 is suddenly stopped, so that the load on the wire-wound motor 20 may be larger than that of the normal stop. However, in a serious failure, there is a high possibility that the wire wound electric motor 20 will be burned out due to a large degree of abnormality. Therefore, it is necessary to immediately stop the operation of the winding motor 20. After that, the display unit 60 displays a warning indicating that the wire-wound electric motor 20 has a serious failure (S90).

The order of steps S50, S60 and S90 is not limited to the order shown in FIG. For example, the operations of steps S50, S60, and S90 may be performed simultaneously. The same applies to the order of steps S70, S80, and S90.

Further, the determinations of step S20 and step S40 may be performed during the step of normal stop (S60). Thus, when the wound electric motor 20 has a serious failure during the normal stop process, that is, when the maximum temperature Thigh is about 100° C. or higher, the wound electric motor 20 can be emergency stopped.

As described above, according to the first embodiment, the non-contact thermometer 30 measures the temperature of the collector ring 221 that rotates so as to slide with the brush 222 in a non-contact manner. The thermometer receiver 40 determines the abnormality of the wire wound electric motor 20 based on the temperature of the collector ring 221. When detecting an abnormality, the control unit 50 stops the operation of the wire wound electric motor 20. Thereby, even if an abnormality such as chattering occurs, the abnormality can be detected before the abnormality is aggravated and the wire wound motor 20 is burned. Furthermore, the operation of the wound motor 20 can be stopped. Therefore, it is possible to suppress the occurrence of burnout of the wire wound electric motor 20. Further, it is possible to suppress the occurrence of a fire by igniting an object around the wire wound electric motor 20 by the splashed material.

Even if the abnormality detection based on the temperature of the collector ring 221 is not performed, the protection relay 11 normally detects the abnormality. When an abnormality occurs in the secondary side current collector 22, an abnormality may occur in the current value of the primary current flowing through the stator. In this case, the protective relay 11 can detect the abnormality and stop the wire wound electric motor 20. However, since the chattering itself has almost no effect on the primary current, the protective relay 11 cannot detect the abnormality due to the chattering.

On the other hand, the wire wound electric motor system 1 according to the present embodiment can detect an abnormality due to chattering based on the temperature of the collector ring 221.

The non-contact thermometer 30 may measure the temperature of the brush 222 instead of the collector ring 221. This is because the brush 222 comes into contact with the collector ring 221, and the temperature of the brush 222 becomes substantially the same as the temperature of the collector ring 221. In this case, the thermometer receiver 40 determines the abnormality of the wire wound electric motor 20 based on the temperature of the brush 222.

Further, instead of the thermometer receiver 40, the control unit 50 may determine that an abnormality has occurred in the wire-wound electric motor 20. In this case, the control unit 50 determines the comparison between the maximum temperature Thigh and the threshold value (steps S30 and S40 in FIG. 4). The control unit 50 calculates the maximum temperature Thigh from the temperatures Tu, Tv, Tw of the collector ring 221 received from the thermometer receiver 40, and compares the maximum temperature Thigh with a threshold value to make a determination. In this case, instead of the maximum temperature Thigh, the average temperature or the minimum temperature of the temperatures Tu, Tv, Tw of the collector ring 221 may be used for the determination.

Further, a plurality of wire-wound motors 20 may be provided, and the abnormality detection may be simultaneously performed for each wire-wound motor 20.

(Second embodiment)
FIG. 5: is a figure which shows an example of a structure of the wire-wound electric motor system 1 by 2nd Embodiment. The second embodiment is different from the first embodiment in that the winding-type electric motor 20a that is stopped is provided and the operation is switched to the winding-type electric motor 20 in which the abnormality has occurred.

The winding motor system 1 includes a plurality of winding motors 20 and 20a. The configurations of the wire-wound motors 20 and 20a according to the second embodiment are similar to those of the wire-wound motor 20 according to the first embodiment. The other wire-wound motor 20a is stopped when a certain wire-wound motor 20 operates. However, the other wire-wound electric motor 20a operates when an abnormality occurs in the wire-wound electric motor 20 and stops.

The thermometer receivers 40 and 40a determine the abnormality of the plurality of wire-wound motors 20 and 20a based on the temperatures of the collector rings 221 and 221a, respectively. Further, the control unit 50 controls the plurality of wire wound electric motors 20 and 20a.

When the thermometer receiver 40 determines that an abnormality has occurred in a certain wire-wound motor 20, the control unit 50 operates the other wire-wound motor 20a that has been stopped to switch the operation of the water pump. As a result, it is possible to automatically switch the operation of the water pump from the winding type motor in which the abnormality has occurred to the winding type motor in which there is no abnormality. As a result, waste of time can be suppressed and the operation of the water pump can be continued.

Further, primary side main circuits 10, 10a, protective relays 11, 11a and non-contact thermometers 30, 30a are also provided so as to correspond to the wound motors 20, 20a.

The other configurations of the winding motor system 1 according to the second embodiment are the same as the corresponding configurations of the winding motor system 1 according to the first embodiment, and thus detailed description thereof will be omitted.

FIG. 6 is a flowchart showing an operation example of the abnormality detection method according to the second embodiment.

The operations of steps S10 to S90 are the same as those in the flowchart of FIG. After step S90, the control unit 50 operates the other wound-type motor 20a that has stopped (S100). Note that, similarly to FIG. 4, steps S50, S60, S90, and S100 are not limited to the order shown in FIG. For example, the operations of steps S50, S60, S90, and S100 may be performed simultaneously. The same applies to the order of steps S70, S80, S90, and S100.

It should be noted that the same abnormality detection operation as that of step S20 and subsequent steps of FIG. 4 may be performed on the wound electric motor 20a that has operated in step S100.

At least a part of the abnormality detection method according to the present embodiment may be configured by hardware or software. In the case of software, a program that realizes at least a part of the function of the abnormality detection method may be stored in a recording medium such as a flexible disk or a CD-ROM, read by a computer, and executed. The recording medium is not limited to a removable medium such as a magnetic disk or an optical disk, and may be a fixed recording medium such as a hard disk device or a memory. Further, the program that realizes at least a part of the function of the abnormality detection method may be distributed via a communication line (including wireless communication) such as the Internet. Further, the program may be distributed in the state of being encrypted, modulated, or compressed, via a wired line such as the Internet or a wireless line, or stored in a recording medium.

Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the invention described in the claims and the equivalents thereof as well as included in the scope and the gist of the invention.

1 winding motor system, 10 primary side main circuit, 11 protective relay, 20 winding motor, 21 shaft, 30 non-contact thermometer, 50 control unit, 60 display unit, 221 collector ring, 222 brush

Claims (7)

A wire wound electric motor for rotating a shaft, comprising: a collector ring rotating with the shaft; and a brush sliding on the rotating collector ring and electrically connected to the collector ring.
A thermometer for measuring the temperature of the collector ring or the brush in a non-contact manner,
A wire-wound motor system comprising: a controller that determines that an abnormality has occurred in the wire-wound motor based on the temperature of the collector ring or the brush and stops the operation of the wire-wound motor. Further comprising an electric power supply unit for operating the winding electric motor by supplying electric power to the winding electric motor,
The wire-wound motor system according to claim 1, wherein the control unit stops the operation of the wire-wound motor by stopping the power supply of the power supply unit. The wire-wound electric motor system according to claim 2, further comprising a relay that stops the power supply of the power supply unit when a current of a predetermined value or more flows from the power supply unit. The wire-wound motor system according to claim 1, wherein the wire-wound motor stops rotation of the shaft when the temperature of the collector ring or the brush is equal to or higher than a first temperature. .. When the temperature of the collector ring or the brush is less than a second temperature higher than the first temperature and higher than the first temperature, the wire-wound electric motor stops the rotation of the shaft according to a stop operation at a normal time,
The wire-wound electric motor according to claim 4, wherein when the temperature of the collector ring or the brush is equal to or higher than the second temperature, the wire-wound motor stops the rotation of the shaft without following the stop operation at the normal time. Electric motor system. A plurality of the winding type motors,
The wire-wound motor according to any one of claims 1 to 5, wherein, when the control unit determines that an abnormality has occurred in a wire-wound motor, the control unit causes another wire-wound motor that has been stopped to operate. system. A winding-type electric motor for rotating a shaft, comprising: a collector ring rotating with the shaft; and a brush sliding on the rotating collector ring and electrically connected to the collector ring. A thermometer for measuring the temperature of a collector ring or the brush in a non-contact manner, and a method for detecting an abnormality in a wire-wound electric motor system comprising a controller for controlling the wire-wound electric motor,
The thermometer measures the temperature of the collector ring or the brush,
The abnormality detecting method, wherein the control unit determines that an abnormality has occurred in the wire-wound motor based on the temperature of the collector ring or the brush, and stops the operation of the wire-wound motor.