JP6393952B2 - Coil temperature measuring device - Google Patents

Description

  The present invention relates to a coil temperature measuring device.

Conventionally, in a rotating electrical machine such as a motor, the temperature of a coil is measured by a temperature sensor for heating protection, and output restriction (power saving) is performed in a high temperature range.
Here, a temperature sensor mounting structure has been proposed in which a temperature sensor is inserted into a mounting hole formed in a stator of a motor (see, for example, Patent Document 1). Also, a temperature sensor mounting structure has been proposed in which two legs of the temperature sensor holder are mounted so as to straddle the coil portion (see, for example, Patent Document 2).

Japanese Patent No. 5239833 Japanese Patent No. 5609275

By the way, the higher the accuracy of coil temperature measurement, the more advantageous is the reduction in size and performance of the rotating electrical machine and the merchantability. Moreover, the reliability of a rotary electric machine can be improved when the failure detection of a temperature sensor is easy.
In the structure described in Patent Document 1, there are many inclusions between the coil and the temperature sensor, and there is room for improvement in terms of increasing the accuracy of coil temperature measurement. Further, in any of the structures of Patent Document 1 and Patent Document 2, it is not easy to detect a failure of the temperature sensor.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a temperature measuring device for a coil that can improve temperature measurement accuracy and easily detect a failure of a temperature sensor unit.

In order to achieve the above object, according to the first aspect of the present invention, the coil temperature measuring device (for example, the temperature measuring device 6 in the embodiment) is an iron core that forms a magnetic path (for example, the stator core 11 in the embodiment). Is a temperature measuring device that measures the temperature of a coil (for example, the coil 12 in the embodiment) attached to a surface of the coil (for example, the surface 31s in the embodiment), and is disposed in contact with the first temperature range ( For example, the first temperature sensor unit (for example, the first temperature sensor unit 41 in the embodiment) capable of detecting the temperature change of the coil in the first temperature range R1) in the embodiment and the surface of the coil are disposed. The temperature change of the coil is detected in a second temperature range (for example, the second temperature range R2 in the embodiment) included in the first temperature range. As well as a capacity, equipped with the output for temperature changes are larger second temperature sensor unit than the first temperature sensor unit (e.g., the second temperature sensor 42 in the embodiment), in the second temperature range, wherein The coil includes a plurality of coil portions (for example, the coil portion 31 in the embodiment) wound around the iron pieces of the iron core (for example, the tooth portion 21 in the embodiment), and the first temperature sensor unit includes the plurality of the first temperature sensor portions. The first coil part (for example, the first coil part 31A in the embodiment) included in the coil part is disposed in contact with the surface of the first coil part, and the second temperature sensor part is included in the plurality of coil parts. (For example, the second coil portion 31B in the embodiment) is disposed in contact with the surface, and the first coil portion and the second coil portion are among the plurality of coil portions. Characterized in that it is a coil unit adjacent to the have.

The invention described in claim 2 is characterized in that an average temperature in the second temperature range is higher than an average temperature in the first temperature range.

According to a third aspect of the present invention, the first temperature range includes the entire temperature range in which the temperature change of the coil occurs.

In the invention described in claim 4 , the coil temperature measuring device is a temperature measuring device for measuring the temperature of the coil attached to the iron core forming the magnetic path, and is arranged in contact with the surface of the coil. 1 temperature sensor part and the 2nd temperature sensor part arrange | positioned in contact with the surface of the said coil, The said 2nd temperature sensor part is a temperature of a part in temperature range where the temperature change of the said coil produces. is only a by detectable change in temperature of the coil frequency, the first temperature sensor unit, Ri detectable der temperature changes of the coil at a temperature range that includes a different temperature zone and the temperature range, the coil A plurality of coil portions wound respectively on the iron pieces of the iron core, wherein the first temperature sensor portion is disposed in contact with a surface of the first coil portion included in the plurality of coil portions, and the second temperature The sensor unit includes the plurality of coils. Is disposed in contact with the surface of the second coil portion included in the first coil portion and the second coil portion may among the plurality of coil portions is a coil unit adjacent to each other.

According to the first aspect of the present invention, the specific temperature range including the temperature range in which the coil temperature is desired to be accurately determined by the second temperature sensor unit whose output change with respect to the temperature change is larger than that of the first temperature sensor unit. For example, in the second temperature range), the coil temperature can be accurately measured. Further, according to the first aspect of the present invention, whether the temperature of the coil is out of the specific temperature range or just the second temperature sensor by just looking at the output from the second temperature sensor unit. If it is difficult to determine whether the part has failed, by using the output from the first temperature sensor part together, whether the coil temperature is out of the specific temperature range, or It is possible to easily determine whether the second temperature sensor unit is out of order. Thereby, while being able to raise the measurement accuracy of the temperature of a coil, the temperature measurement apparatus with which the failure detection of a temperature sensor part is easy can be provided.
Moreover, the temperature of a coil is measured by the 1st temperature sensor part and 2nd temperature sensor part which are arrange | positioned in contact with the surface of the two coil parts each wound by the iron piece (for example, teeth part) of the iron core. According to such a configuration, it is easy to ensure a relatively large contact area between the first temperature sensor unit and the second temperature sensor unit with respect to the surface of the coil. For this reason, the measurement accuracy of the coil temperature can be further increased.
In addition, the first temperature sensor unit and the second temperature sensor unit are disposed in contact with adjacent coil units among the plurality of coil units. According to such a configuration, it is possible to reduce the influence of the surrounding environment (arrangement position, temperature of peripheral components, etc.) that causes a temperature difference between the first temperature sensor unit and the second temperature sensor unit. Thereby, the accuracy of failure detection can be further increased.

According to the invention described in claim 2, by the second temperature sensor unit, the temperature change of the coil can be accurately measured, for example, high temperature range required heating protection. As a result, the rotating electrical machine can be reduced in size, performance, and added value.

According to the invention described in claim 3 , by detecting the output from the first temperature sensor unit, it is possible to detect the presence or absence of a failure of the second temperature sensor unit over the entire temperature range in which the temperature change of the coil occurs. it can. Thereby, the accuracy of failure detection can be further increased.

According to the invention described in claim 4 , whether the temperature of the coil is out of a specific temperature range or the second temperature sensor unit fails only by looking at the output from the second temperature sensor unit. If it is difficult to determine whether or not the coil temperature is outside the specific temperature range by using the output from the first temperature sensor unit in combination, or the second temperature It is possible to easily determine whether the sensor unit is out of order. For this reason, as the second temperature sensor unit, a temperature sensor unit that has a relatively large output change with respect to a temperature change in a limited temperature range can be employed. Thereby, while being able to raise the measurement accuracy of the temperature of a coil, the temperature measurement apparatus with which the failure detection of a temperature sensor part is easy can be provided.
Moreover, the temperature of a coil is measured by the 1st temperature sensor part and 2nd temperature sensor part which are arrange | positioned in contact with the surface of the two coil parts each wound by the iron piece (for example, teeth part) of the iron core. According to such a configuration, it is easy to ensure a relatively large contact area between the first temperature sensor unit and the second temperature sensor unit with respect to the surface of the coil. For this reason, the measurement accuracy of the coil temperature can be further increased.
In addition, the first temperature sensor unit and the second temperature sensor unit are disposed in contact with adjacent coil units among the plurality of coil units. According to such a configuration, it is possible to reduce the influence of the surrounding environment (arrangement position, temperature of peripheral components, etc.) that causes a temperature difference between the first temperature sensor unit and the second temperature sensor unit. Thereby, the accuracy of failure detection can be further increased.

It is sectional drawing which shows the whole structure of the motor of 1st Embodiment. It is a perspective view which shows a part of stator of 1st Embodiment. FIG. 3 is a cross-sectional view of the stator shown in FIG. 2 taken along line F3-F3. It is a block diagram which shows the system configuration | structure of the temperature measuring device of 1st Embodiment. It is a figure which shows the difference of the output characteristic of two temperature sensor parts of 1st Embodiment. It is a figure which shows the difference of the output characteristic of two temperature sensor parts of 2nd Embodiment.

  Next, embodiments of the present invention will be described with reference to the drawings. In the following description, components having substantially the same or similar functions are denoted by the same reference numerals. And those overlapping descriptions may be omitted.

(First embodiment)
First, the temperature measuring device 6 according to the first embodiment will be described with reference to FIGS. 1 to 5.
FIG. 1 shows an overall configuration of a motor 1 provided with a temperature measuring device 6 of the present embodiment.
The motor 1 is a traveling motor mounted on a vehicle such as a hybrid vehicle or an electric vehicle. However, the temperature measurement device 6 of the present embodiment is not limited to the above example, but can be applied to a motor for power generation and other uses, and can also be applied to a rotating electrical machine other than the motor. The motor 1 of this embodiment is, for example, a concentrated winding motor.

As shown in FIG. 1, the motor 1 includes a case 2, a stator 3, a rotor 4, an output shaft 5, a temperature measuring device 6 (see FIG. 2), and a motor ECU (Electronic Control Unit) 7 (see FIG. 4). ).
The case 2 is formed in a cylindrical shape that houses the stator 3 and the rotor 4, for example.
The stator 3 is formed in an annular shape and attached to, for example, the inner peripheral surface of the case 2. The stator 3 includes a stator core 11 and a coil (stator coil) 12 attached to the stator core 11, and causes a rotating magnetic field to act on the rotor 4.
The rotor 4 includes, for example, a rotor core and a magnet attached to the rotor core, and is driven to rotate inside the stator 3.
The output shaft 5 is connected to the rotor 4 and outputs the rotation of the rotor 4 as a driving force.
The temperature measuring device 6 and the motor ECU 7 will be described later.

  Here, the axial direction Z, the radial direction R, and the circumferential direction θ (see FIG. 2) of the stator core 11 are defined. The axial direction Z of the stator core 11 is a direction extending substantially parallel to the rotation center axis C of the output shaft 5. The radial direction R of the stator core 11 is a direction radially away from the rotation center axis C and the opposite direction (direction approaching the rotation center axis C). The circumferential direction θ of the stator core 11 is a direction that rotates around the rotation center axis C while maintaining a certain distance from the rotation center axis C.

Next, the stator 3 will be described in detail.
FIG. 2 is a perspective view showing a part of the stator 3.
As shown in FIG. 2, the stator 3 includes a stator core 11 and a coil 12 attached to the stator core 11.

The stator core 11 is formed in an annular shape surrounding the rotor 4. The stator core 11 may be a divided stator core formed by connecting a plurality of pieces divided in the circumferential direction θ, for example, and is formed by laminating a plurality of electromagnetic steel plates in the axial direction Z. A laminated stator core may be used. The stator core 11 is an example of “an iron core that forms a magnetic path”.
The stator core 11 has an annular yoke portion (not shown), a plurality of teeth portions 21, and a plurality of slots 22. The plurality of teeth portions 21 protrude from the yoke portion toward the inside in the radial direction R of the stator core 11. Each tooth part 21 is an example of an “iron piece”. Each slot 22 is formed between two tooth portions 21 adjacent to each other in the circumferential direction θ of the stator core 11.

  The coil 12 is attached to the stator core 11 to form a three-phase coil composed of a U phase, a V phase, and a W phase. The coil 12 includes a plurality of coil portions 31 that are divided into a plurality of tooth portions 21. The plurality of coil portions 31 are arranged side by side in the circumferential direction θ of the stator core 11. Each coil portion 31 is passed through the slot 22 and wound around the teeth portion 21 over a plurality of circumferences.

FIG. 3 is a sectional view taken along line F3-F3 of the stator 3 shown in FIG.
As shown in FIG. 3, the surface 31 s of each coil part 31 includes a flat part 31 a along the radial direction R and the circumferential direction θ of the stator core 11. The “planar portion” referred to in the present application is not limited to a flat surface in a strict sense, and may have partial unevenness. For example, each coil part 31 includes a plurality of winding elements 35 arranged side by side in the radial direction R of the stator core 11. The “winding element” referred to in the present application means a winding for one turn wound around the tooth portion 21. An example of the flat surface portion 31 a is formed by the surfaces of a plurality of winding elements 35 arranged in a line along the radial direction R of the stator core 11.

Next, the temperature measuring device 6 that measures the temperature of the coil 12 will be described.
FIG. 4 is a block diagram showing a system configuration of the temperature measuring device 6.
As shown in FIG. 4, the temperature measuring device 6 includes a first temperature sensor unit 41, a second temperature sensor unit 42, an input terminal 43, ground terminals 44A and 44B, detection lines 45A and 45B, pull-up resistors 46A and 46B, An input interface circuit 47 and an information processing unit 48 are included. The temperature measuring device 6 includes a sensor holder 49 that holds the first temperature sensor unit 41 and the second temperature sensor unit 42 (see FIG. 2).

First, the arrangement of the first temperature sensor unit 41 and the second temperature sensor unit 42 will be described.
As shown in FIG. 2, the first temperature sensor unit 41 is disposed in one coil unit 31 (hereinafter referred to as a first coil unit 31 </ b> A) included in the plurality of coil units 31. The first temperature sensor unit 41 is disposed in contact with the surface 31s of the first coil unit 31A. For example, the first temperature sensor part 41 is in contact with the flat part 31a of the surface 31s of the first coil part 31A.

On the other hand, the 2nd temperature sensor part 42 is arrange | positioned at another one coil part 31 (henceforth the 2nd coil part 31B) contained in the some coil part 31. FIG. The second coil portion 31 </ b> B is a coil portion 31 located next to the first coil portion 31 </ b> A in the circumferential direction θ of the stator core 11 among the plurality of coil portions 31. The second temperature sensor unit 42 is disposed in contact with the surface 31s of the second coil unit 31B. For example, the 2nd temperature sensor part 42 is in contact with the plane part 31a of the surface 31s of the 2nd coil part 31B. The second coil part 31B where the second temperature sensor part 42 is disposed may be the coil part 31 located on either side of the first coil part 31A in the circumferential direction θ of the stator core 11.
As shown in FIG. 2, the first temperature sensor unit 41 and the second temperature sensor unit 42 are in contact with the first coil unit 31 </ b> A and the second coil unit 31 </ b> B from the same direction along the axial direction Z of the stator core 11. Yes.

As shown in FIG. 3, each of the first temperature sensor unit 41 and the second temperature sensor unit 42 includes a sensor main body 51 and a resin portion 52 that covers the sensor main body 51.
The configuration of the sensor body 51 is not limited to a specific one. For example, the sensor body 51 is a thermistor whose resistance value (electrical resistance value) changes due to temperature changes. In the present embodiment, the sensor body 51 is a thermistor that has a negative resistance characteristic with respect to a temperature change (that is, the resistance value decreases when the temperature rises and the resistance value increases when the temperature decreases). .
The resin part 52 is, for example, translucent and seals the sensor body 51 to protect the sensor body 51. The resin part 52 of the first temperature sensor part 41 is in direct contact with the surface 31s of the first coil part 31A. Thereby, the first temperature sensor unit 41 directly measures the temperature of the surface 31s of the first coil unit 31A. On the other hand, the resin part 52 of the second temperature sensor part 42 is in direct contact with the surface 31s of the second coil part 31B. Thereby, the 2nd temperature sensor part 42 measures the temperature of the surface 31s of the 2nd coil part 31B directly.

Here, the sensor holder 49 that holds the first temperature sensor unit 41 and the second temperature sensor unit 42 will be described first.
As shown in FIG. 2, the sensor holder 49 is attached to the case 2, for example, and fixes the positions of the first temperature sensor unit 41 and the second temperature sensor unit 42. Specifically, the sensor holder 49 includes a base part 60, a first holder part 61, a first pressing part 62, a second holder part 63, and a second pressing part 64.

The base part 60 is fixed to the case 2.
The first holder part 61 holds the first temperature sensor part 41. Specifically, the first holder part 61 is located on the opposite side of the first temperature sensor part 41 from the surface 31s of the first coil part 31A. As shown in FIG. 3, the first holder portion 61 has a recess 67 to which the first temperature sensor portion 41 is attached. The first temperature sensor unit 41 is fixed to the first holder unit 61 by being fitted into the recess 67 of the first holder unit 61. The first holder part 61 is made of, for example, a synthetic resin.

  As shown in FIG. 2, the first pressing part 62 is provided between the base part 60 and the first holder part 61, and connects the base part 60 and the first holder part 61. The 1st press part 62 is metal, for example, functions as a leaf | plate spring. That is, the 1st press part 62 has elasticity, and presses the 1st holder part 61 (namely, 1st temperature sensor part 41) toward the plane part 31a of the surface 31s of 31 A of 1st coils. Thereby, the contact of the 1st temperature sensor part 41 and the surface 31s of 31 A of 1st coil parts is maintained reliably.

  The configurations and functions of the second holder portion 63 and the second pressing portion 64 are substantially the same as the configurations and functions of the first holder portion 61 and the first pressing portion 62. The configurations and functions of the second holder part 63 and the second pressing part 64 are the same as those in the above description relating to the first holder part 61 and the first pressing part 62. The “first holder part 61” is replaced with the “second holder part 63”, “ “First pressing portion 62” is read as “second pressing portion 64”, “first temperature sensor portion 41” is read as “second temperature sensor portion 42”, and “first coil portion 31A” is read as “second coil portion 31B”. Just do it.

Next, output characteristics of the first temperature sensor unit 41 and the second temperature sensor unit 42 will be described.
FIG. 5 is a diagram illustrating a difference in output characteristics between the two temperature sensor units 41 and 42.
As shown in FIG. 5, the first temperature sensor unit 41 and the second temperature sensor unit 42 of the present embodiment have different output characteristics with respect to temperature changes.

  The first temperature sensor unit 41 can detect a temperature change of the coil 12 in the first temperature range R1. Note that “a temperature change can be detected in a certain temperature range” in the present application means that the output of the sensor unit changes at a plurality of temperatures including the vicinity of the upper limit value and the vicinity of the lower limit value of the temperature range. In addition, the “output of the sensor unit” in the present application is not limited to a signal actively transmitted by the sensor unit. For example, when a reference voltage or the like is applied to the sensor unit, the output depends on the physical property value of the sensor unit. Alternatively, a voltage value or a current value acting on a wiring or a circuit electrically connected to the sensor unit may be used. The “wiring” referred to in the present application includes a wiring pattern formed on a circuit board. In addition, the “output change” in the present application is electrically connected to the sensor unit that is generated based on a change in a physical property value (for example, a resistance value) of the sensor unit when a reference voltage or the like is applied to the sensor unit. This includes changes in voltage values and current values that affect wiring and circuits.

  Here, the first temperature range R1 includes, for example, the entire temperature range in which the temperature change of the coil 12 occurs. The “temperature range in which the coil temperature change occurs” referred to in the present application is a temperature range in which the temperature change of the coil 12 is assumed when the motor 1 is stopped and when the motor 1 is normally used. That is, the “temperature range in which the coil temperature changes” means all temperatures of the coil 12 when the motor 1 is stopped (when the coil 12 is not used), when the motor 1 is at a low output, and when the motor 1 is at a high output. It is the temperature range including. For example, the first temperature range R1 of the present embodiment is a low temperature range in which the Celsius temperature is negative (for example, the temperature when the motor 1 is stopped in a cold region) as a part of the temperature range in which the temperature change of the coil 12 occurs. Including.

On the other hand, the second temperature sensor unit 42 can detect a temperature change of the coil 12 in the second temperature range R2 included in the first temperature range R1. That is, the second temperature range R2 is a temperature range narrower than the first temperature range R1, and is a partial temperature range included in the first temperature range R1. In other words, the second temperature range R2 is a part of the temperature range in which the temperature change of the coil 12 occurs.
The second temperature range R2 of the present embodiment includes a predetermined high temperature range (for example, a temperature range indicated by dot hatching in FIG. 5) for which the temperature of the coil 12 is to be accurately known. The predetermined high temperature range is, for example, a high temperature range where the motor 1 needs to be heated and protected. In other words, an example of the predetermined high temperature range includes a threshold temperature at which output restriction (power saving) of the motor 1 is started.
From another viewpoint, the average temperature in the second temperature range R2 is higher than the average temperature in the first temperature range R1. The “average temperature in a certain temperature range” referred to in the present application is a median value between the upper limit value and the lower limit value of the temperature range.

And the 2nd temperature sensor part 42 of this embodiment has a larger output change with respect to a temperature change than the 1st temperature sensor part 41 in 2nd temperature range R2. As used herein, “the output change with respect to the temperature change is large” means that the output change per unit temperature is large.
In a specific example, the resistance values of the sensor bodies 51 (thermistors) of the first temperature sensor unit 41 and the second temperature sensor unit 42 conform to the following formula (1). In equation (1), R is the resistance value of the sensor body 51 at the absolute temperature T, R ₀ is the resistance value of the sensor body 51 at the absolute temperature T ₀ , and B is the center of each temperature sensor unit 41, 42. This is a constant (B constant) determined by the characteristics of the main body 51.

  In the present embodiment, the B constant of the sensor body 51 of the first temperature sensor unit 41 is 1000K to 3000K. On the other hand, the B constant of the sensor main body 51 of the second temperature sensor unit 42 is 3000K to 8000K. For this reason, the second temperature sensor unit 42 has a higher rate of change in resistance with respect to a temperature change than the first temperature sensor unit 41 in the second temperature range R2.

  On the other hand, the second temperature sensor unit 42 outputs even if there is a temperature change in a temperature range outside the second temperature range R2 in the first temperature range R1 (hereinafter referred to as the third temperature range R3). Does not change substantially. The third temperature range R3 is a non-detection region where the second temperature sensor unit 42 cannot detect the temperature.

Next, another configuration of the temperature measuring device 6 will be described with reference to FIG.
A reference voltage is supplied to the input terminal 43 from the outside. An example of the reference voltage is + 5V. The first ground terminal 44A and the second ground terminal 44B are each electrically connected to the ground. The first detection line 45A and the second detection line 45B are provided electrically in parallel between the input terminal 43 and the two ground terminals 44A and 44B. That is, the first detection line 45A is provided between the input terminal 43 and the first ground terminal 44A. The second detection line 45B is provided between the input terminal 43 and the second ground terminal 44B.

  The first temperature sensor unit 41 and the first pull-up resistor 46A are provided on the first detection line 45A. The first pull-up resistor 46 </ b> A is provided between the input terminal 43 and the first temperature sensor unit 41. On the other hand, the second temperature sensor unit 42 and the second pull-up resistor 46B are provided in the second detection line 45B. The second pull-up resistor 46 </ b> B is provided between the input terminal 43 and the second temperature sensor unit 42.

The input interface circuit 47 is electrically connected to the first detection line 45A between the first pull-up resistor 46A and the first temperature sensor unit 41. As a result, the input interface circuit 47 determines the voltage value (for example, 0) applied to the first detection line 45A between the first pull-up resistor 46A and the first temperature sensor unit 41 based on the resistance value of the first temperature sensor unit 41. ˜5V) is acquired as the output of the first temperature sensor unit 41.
Similarly, the input interface circuit 47 is electrically connected to the second detection line 45B between the second pull-up resistor 46B and the second temperature sensor unit 42. As a result, the input interface circuit 47 has a voltage value (for example, 0) applied to the second detection line 45B between the second pull-up resistor 46B and the second temperature sensor unit 42 based on the resistance value of the second temperature sensor unit 42. ˜5V) is acquired as the output of the second temperature sensor unit 42.
For example, the input interface circuit 47 converts an analog voltage value acquired as an output of the first temperature sensor unit 41 and the second temperature sensor unit 42 into a digital value. The input interface circuit 47 outputs the outputs of the first temperature sensor unit 41 and the second temperature sensor unit 42 converted to digital values to the motor ECU 7.

  The motor ECU 7 is a control unit that controls the motor 1. For example, the motor ECU 7 includes a driving force control unit 71 that controls the traveling driving force of the motor 1. The driving force control unit 71 controls the rotational speed of the motor 1 by adjusting the duty ratio of the PWM signal applied to the motor 1. Further, the driving force control unit 71 controls the traveling driving force of the motor 1 based on information received from the temperature measuring device 6. For example, the driving force control unit 71 limits the output of the motor 1 when the temperature of the coil 12 calculated based on the output of the second temperature sensor unit 42 exceeds a preset threshold value.

  Next, an information processing unit (temperature information processing unit) 48 provided in the motor ECU 7 as a part of the temperature measuring device 6 of this embodiment will be described.

The information processing unit 48 calculates the temperature of the coil 12 based on information obtained from the output of the first temperature sensor unit 41. Further, the information processing unit 48 calculates the temperature of the coil 12 based on information obtained from the output of the second temperature sensor unit 42.
Then, the information processing unit 48 compares the temperature of the coil 12 calculated based on the output of the first temperature sensor unit 41 with the temperature of the coil 12 calculated based on the output of the second temperature sensor unit 42. The information processing unit 48 determines in advance that the difference between the temperature of the coil 12 calculated based on the output of the first temperature sensor unit 41 and the temperature of the coil 12 calculated based on the output of the second temperature sensor unit 42 is in advance. When it is within the set predetermined range, it is determined that the first temperature sensor unit 41 and the second temperature sensor unit 42 are normal. In this case, the information processing unit 48 outputs the temperature of the coil 12 calculated based on the output of the second temperature sensor unit 42 with high measurement accuracy to the driving force control unit 71 as temperature information of the coil 12. The driving force control unit 71 controls the motor 1 (for example, output limitation) based on the temperature of the coil 12 calculated from the output of the second temperature sensor unit 42.

Here, when the temperature of the coil 12 is in the above-described third temperature range R3 (that is, the non-detection region of the second temperature sensor unit 42), the output of the second temperature sensor unit 42 is a predetermined fixed value (for example, The voltage value applied to the second detection line 45B is 5V). Whether the temperature of the coil 12 is within the third temperature range R3 by using the output of the first temperature sensor unit 41 together with the output of the second temperature sensor unit 42 when the output of the second temperature sensor unit 42 is the fixed value. Or, it is determined whether the second temperature sensor unit 42 is out of order.
For example, the information processing unit 48 is a case where the output of the second temperature sensor unit 42 is the fixed value, and the temperature of the coil 12 calculated based on the output of the first temperature sensor unit 41 is the third temperature range. When it exists in R3, it determines with there being no abnormality in the 2nd temperature sensor part 42. FIG. In this case, the information processing unit 48 outputs the temperature of the coil 12 calculated based on the output of the first temperature sensor unit 41 to the driving force control unit 71 as temperature information of the coil 12. The driving force control unit 71 controls the motor 1 based on the temperature value of the coil 12 calculated from the output of the first temperature sensor unit 41.
On the other hand, the information processing unit 48 is a case where the output of the second temperature sensor unit 42 is the fixed value, and the temperature of the coil 12 calculated based on the output of the first temperature sensor unit 41 is the third temperature. When it is not in the range R3 (that is, when it is in the second temperature range R2), it is determined that the second temperature sensor unit 42 is abnormal. Thereby, failure detection of the 2nd temperature sensor part 42 is performed.

  Further, the information processing unit 48 is a case where the output of the second temperature sensor unit 42 is other than the fixed value, and the temperature of the coil 12 calculated based on the output of the first temperature sensor unit 41 and the second temperature sensor. When the temperature of the coil 12 calculated based on the output of the unit 42 is different from the predetermined range, it is determined that at least one of the first temperature sensor unit 41 and the second temperature sensor unit 42 is abnormal. To do. Thereby, failure detection of the 1st temperature sensor part 41 and the 2nd temperature sensor part 42 is performed.

  Part or all of the information processing unit 48 and the driving force control unit 71 is a software function unit that functions when a processor such as a CPU (Central Processing Unit) executes a program. Further, a part or all of the information processing unit 48 and the driving force control unit 71 may be hardware function units such as an LSI (Large Scale Integration) and an ASIC (Application Specific Integrated Circuit). Note that the information processing unit 48 may be provided in a device different from the motor ECU 7.

  According to the temperature measuring device 6 having the above-described configuration, it is possible to provide the temperature measuring device 6 that can increase the temperature measurement accuracy of the coil 12 and can easily detect the failure of the temperature sensor units 41 and 42. . That is, generally, a temperature sensor unit that can detect a temperature change in a relatively wide temperature range (for example, the entire temperature range in which the temperature change of the coil 12 occurs) has a small output change with respect to the temperature change. For this reason, according to the said temperature sensor part, it is difficult to raise the measurement precision of the temperature of the coil 12. FIG. Therefore, it is conceivable to insert the temperature sensor unit into the coil 12. However, in this case, since the number of windings and the layout of the coil 12 are restricted, it is difficult to improve the performance of the motor 1.

  On the other hand, according to the configuration of the present embodiment, the temperature of the coil 12 is accurately known by the second temperature sensor unit 42 whose output change with respect to the temperature change is relatively large instead of the detectable temperature range being limited. The temperature of the coil 12 can be accurately measured within a specific temperature range (second temperature range R2) including the temperature range. Furthermore, according to the above configuration, whether or not the temperature of the coil 12 is in the temperature range outside the specific temperature range, or only by looking at the output from the second temperature sensor unit 42, or the second temperature sensor unit 42 When it is difficult to determine whether or not a failure has occurred, by using the output from the first temperature sensor unit 41 together, whether the temperature of the coil 12 is in a temperature range outside the specific temperature range, or It is possible to easily determine whether the second temperature sensor unit 42 is malfunctioning. Thereby, the failure detection of a temperature sensor part becomes easy. In addition, according to the configuration of the present embodiment, it is possible to detect a characteristic abnormality of the temperature sensor unit (for example, an intermediate fixing in which the temperature sensor continues to show a specific temperature, etc.) regardless of the estimated detection based on the integrated value of power and current. It is. Thereby, OBD (On-Board Diagnostics) which is a self-diagnosis function of a failure can be realized at a high level. Furthermore, redundancy of failure detection can be achieved by using the measurement result of the first temperature sensor unit 41 and the measurement result of the second temperature sensor unit 42 in combination.

  From another viewpoint, according to the above configuration, the temperature of the coil 12 is measured by the first temperature sensor unit 41 and the second temperature sensor unit 42 arranged in contact with the surface 31 s of the coil 12. According to such a configuration, the number of windings and the layout of the coil 12 of the motor 1 are not sacrificed by the arrangement of the temperature sensor unit. For this reason, it is easy to improve the performance of the motor 1. Further, when the temperature of the coil 12 is measured by the first temperature sensor unit 41 and the second temperature sensor unit 42 arranged in contact with the surface 31s of the coil 12, the stator 3 is not disassembled when the temperature sensor unit fails. The temperature sensor unit can be replaced. For this reason, the maintainability of the motor 1 can be improved.

  In the present embodiment, the temperature of the coil 12 is measured by the first temperature sensor unit 41 and the second temperature sensor unit 42 disposed in contact with the surfaces 31 s of the two coil units 31 wound around the tooth unit 21. The According to such a configuration, it is easy to ensure a relatively large contact area between the first temperature sensor unit 41 and the second temperature sensor unit 42 with respect to the surface 31 s of the coil 12. For this reason, the measurement accuracy of the temperature of the coil 12 can be further increased.

  In this embodiment, the 1st temperature sensor part 41 and the 2nd temperature sensor part 42 are arrange | positioned in contact with mutually adjacent coil part 31A, 31B in the some coil part 31. As shown in FIG. According to such a configuration, it is possible to reduce the influence of the surrounding environment (arrangement position, temperature of peripheral components, etc.) that causes a temperature difference between the first temperature sensor unit 41 and the second temperature sensor unit 42. it can. Thereby, the accuracy of failure detection can be further increased. Moreover, according to the said structure, the disconnection of the phase of the coil 12 is also detectable.

  In the present embodiment, the temperature change of the coil 12 can be accurately measured by the second temperature sensor unit 42, for example, in a high temperature range where heating protection is required. Thereby, size reduction, high performance, high added value, etc. of the motor 1 can be achieved.

  In the present embodiment, by looking at the output from the first temperature sensor unit 41, it is possible to detect the presence or absence of a failure of the second temperature sensor unit 42 in the entire temperature range in which the temperature change of the coil 12 occurs. Thereby, the accuracy of failure detection can be further increased.

(Second Embodiment)
Next, the temperature measuring device 6 for the coil 12 according to the second embodiment will be described with reference to FIG. As shown in FIG. 6, the first temperature sensor unit 41 of the present embodiment has substantially the same magnitude of the output change with respect to the temperature change as the second temperature sensor unit 42. However, the first temperature sensor 41 is configured such that the temperature of the coil 12 is different from the temperature range that can be detected by the second temperature sensor 42 (for example, the temperature range lower than the temperature range that can be detected by the second temperature sensor 42). A temperature change can be detected. In addition, the other structure of this embodiment is the same as the structure of 1st Embodiment.

  Even with such a configuration, as in the first embodiment, the measurement accuracy of the temperature of the coil 12 can be increased, and the failure detection of the temperature sensor units 41 and 42 can be performed.

As mentioned above, although the form for implementing this invention was demonstrated using embodiment, this invention is not limited to such embodiment etc., In the range which does not deviate from the summary of this invention, various deformation | transformation and substitution are carried out. Can be added.
For example, the configuration of the above embodiment is applicable not only to concentrated winding motors but also to distributed winding motors. That is, the 1st temperature sensor part 41 and the 2nd temperature sensor part 42 may be arrange | positioned in contact with the surface of the coil 12 of a distributed winding motor. Further, the first coil part 31A where the first temperature sensor part 41 is arranged and the second coil part 31B where the second temperature sensor part 42 is arranged may be coil parts which are not adjacent to each other. The first temperature sensor unit 41 and the second temperature sensor unit 42 may be disposed in the same coil unit 31.

  DESCRIPTION OF SYMBOLS 1 ... Motor, 11 ... Stator core (iron core), 12 ... Coil, 21 ... Teeth part (iron piece), 31 ... Coil part, 31A ... 1st coil part, 31B ... 2nd coil part, 31s ... Surface of coil part, 41 ... 1st temperature sensor part, 42 ... 2nd temperature sensor part, R1 ... 1st temperature range, R2 ... 2nd temperature range.

Claims (4)

A temperature measuring device for measuring the temperature of a coil attached to an iron core forming a magnetic path,
A first temperature sensor unit disposed in contact with the surface of the coil and capable of detecting a temperature change of the coil in a first temperature range;
The coil is arranged in contact with the surface of the coil and can detect a change in the temperature of the coil in a second temperature range included in the first temperature range, and the temperature in the second temperature range is higher than that of the first temperature sensor unit. A second temperature sensor unit having a large output change with respect to the change;
Equipped with a,
The coil includes a plurality of coil portions wound around the iron pieces of the iron core,
The first temperature sensor unit is disposed in contact with a surface of a first coil unit included in the plurality of coil units, and the second temperature sensor unit is a surface of a second coil unit included in the plurality of coil units. Placed in contact with
The coil temperature measuring device, wherein the first coil part and the second coil part are coil parts adjacent to each other among the plurality of coil parts . The average temperature of the second temperature range, the temperature measuring device of the coil of claim 1, wherein the higher than the average temperature of the first temperature range. 3. The coil temperature measuring device according to claim 1, wherein the first temperature range includes an entire temperature range in which a temperature change of the coil occurs. 4. A temperature measuring device for measuring the temperature of a coil attached to an iron core forming a magnetic path,
A first temperature sensor unit disposed in contact with the surface of the coil;
A second temperature sensor unit disposed in contact with the surface of the coil;
With
The second temperature sensor unit can detect the temperature change of the coil only in a part of the temperature range in which the temperature change of the coil occurs.
The first temperature sensor unit, Ri detectable der temperature changes of the coil at a temperature range that includes a different temperature zone and the temperature range,
The coil includes a plurality of coil portions wound around the iron pieces of the iron core,
The first temperature sensor unit is disposed in contact with a surface of a first coil unit included in the plurality of coil units, and the second temperature sensor unit is a surface of a second coil unit included in the plurality of coil units. Placed in contact with
The coil temperature measuring device, wherein the first coil part and the second coil part are coil parts adjacent to each other among the plurality of coil parts .

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